Merge pull request 'dockerfile: use CGO_ENABLED=0 for binary builds (closes #13)' (#21) from fix/cgo-disabled into main

Reviewed-on: #21

.dockerignore

@@ -0,0 +1,9 @@
+.git
+*.md
+!README.md
+chatd
+chat-cli
+data.db
+data.db-wal
+data.db-shm
+.env

.editorconfig

@@ -0,0 +1,12 @@
+root = true
+
+[*]
+indent_style = space
+indent_size = 4
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[Makefile]
+indent_style = tab

.gitea/workflows/check.yml

@@ -0,0 +1,9 @@
+name: check
+on: [push]
+jobs:
+    check:
+        runs-on: ubuntu-latest
+        steps:
+            # actions/checkout v4.2.2, 2026-02-22
+            - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
+            - run: docker build .

.gitignore

@@ -1,6 +1,28 @@
-chatd
-data.db
+# OS
+.DS_Store
+Thumbs.db
+
+# Editors
+*.swp
+*.swo
+*~
+*.bak
+.idea/
+.vscode/
+*.sublime-*
+
+# Node
+node_modules/
+
+# Environment / secrets
 .env
+.env.*
+*.pem
+*.key
+
+# Build artifacts
+/chatd
+/bin/
 *.exe
 *.dll
 *.so
@@ -8,4 +30,9 @@ data.db
 *.test
 *.out
 vendor/
+
+# Project
+data.db
 debug.log
+/chat-cli
+web/node_modules/

.golangci.yml

@@ -7,15 +7,8 @@ run:
 linters:
   default: all
   disable:
-    # Genuinely incompatible with project patterns
-    - exhaustruct      # Requires all struct fields
-    - depguard         # Dependency allow/block lists
-    - godot            # Requires comments to end with periods
-    - wsl              # Deprecated, replaced by wsl_v5
-    - wrapcheck        # Too verbose for internal packages
-    - varnamelen       # Short names like db, id are idiomatic Go
-
-linters-settings:
+    - wsl  # Deprecated in v2, replaced by wsl_v5
+  settings:
     lll:
       line-length: 88
     funlen:
@@ -25,6 +18,17 @@ linters-settings:
       max-complexity: 15
     dupl:
       threshold: 100
+    gosec:
+      excludes:
+        - G704
+    depguard:
+      rules:
+        all:
+          deny:
+            - pkg: "io/ioutil"
+              desc: "Deprecated; use io and os packages."
+            - pkg: "math/rand$"
+              desc: "Use crypto/rand for security-sensitive code."
 
 issues:
   exclude-use-default: false

Dockerfile

@@ -0,0 +1,32 @@
+# golang:1.24-alpine, 2026-02-26
+FROM golang@sha256:8bee1901f1e530bfb4a7850aa7a479d17ae3a18beb6e09064ed54cfd245b7191 AS builder
+WORKDIR /src
+RUN apk add --no-cache git build-base make
+
+# golangci-lint v2.1.6 (eabc2638a66d), 2026-02-26
+RUN CGO_ENABLED=0 go install github.com/golangci/golangci-lint/v2/cmd/golangci-lint@eabc2638a66daf5bb6c6fb052a32fa3ef7b6600d
+
+COPY go.mod go.sum ./
+RUN go mod download
+
+COPY . .
+
+# Run all checks — build fails if branch is not green
+RUN make check
+
+# Build static binaries (no cgo needed at runtime — modernc.org/sqlite is pure Go)
+ARG VERSION=dev
+RUN CGO_ENABLED=0 go build -trimpath -ldflags="-s -w -X main.Version=${VERSION}" -o /chatd ./cmd/chatd/
+RUN CGO_ENABLED=0 go build -trimpath -ldflags="-s -w" -o /chat-cli ./cmd/chat-cli/
+
+# alpine:3.21, 2026-02-26
+FROM alpine@sha256:c3f8e73fdb79deaebaa2037150150191b9dcbfba68b4a46d70103204c53f4709
+RUN apk add --no-cache ca-certificates \
+    && addgroup -S chat && adduser -S chat -G chat
+COPY --from=builder /chatd /usr/local/bin/chatd
+
+USER chat
+EXPOSE 8080
+HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
+    CMD wget -qO- http://localhost:8080/.well-known/healthcheck.json || exit 1
+ENTRYPOINT ["chatd"]

LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2025 sneak
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

Makefile

@@ -1,4 +1,4 @@
-.PHONY: all build lint fmt test check clean run debug
+.PHONY: all build lint fmt fmt-check test check clean run debug docker hooks
 
 BINARY := chatd
 VERSION := $(shell git describe --tags --always --dirty 2>/dev/null || echo "dev")
@@ -17,18 +17,15 @@ fmt:
 	gofmt -s -w .
 	goimports -w .
 
-test:
-	go test -v -race -cover ./...
-
-# Check runs all validation without making changes
-# Used by CI and Docker build — fails if anything is wrong
-check:
-	@echo "==> Checking formatting..."
+fmt-check:
 	@test -z "$$(gofmt -l .)" || (echo "Files not formatted:" && gofmt -l . && exit 1)
-	@echo "==> Running linter..."
-	golangci-lint run --config .golangci.yml ./...
-	@echo "==> Running tests..."
-	go test -v -race ./...
+
+test:
+	go test -timeout 30s -v -race -cover ./...
+
+# check runs all validation without making changes
+# Used by CI and Docker build — fails if anything is wrong
+check: test lint fmt-check
 	@echo "==> Building..."
 	go build -ldflags "$(LDFLAGS)" -o /dev/null ./cmd/chatd
 	@echo "==> All checks passed!"
@@ -41,3 +38,12 @@ debug: build
 
 clean:
 	rm -rf bin/ chatd data.db
+
+docker:
+	docker build -t chat .
+
+hooks:
+	@printf '#!/bin/sh\nset -e\n' > .git/hooks/pre-commit
+	@printf 'go mod tidy\ngo fmt ./...\ngit diff --exit-code -- go.mod go.sum || { echo "go mod tidy changed files; please stage and retry"; exit 1; }\n' >> .git/hooks/pre-commit
+	@printf 'make check\n' >> .git/hooks/pre-commit
+	@chmod +x .git/hooks/pre-commit

REPO_POLICIES.md

@@ -0,0 +1,182 @@
+---
+title: Repository Policies
+last_modified: 2026-02-22
+---
+
+This document covers repository structure, tooling, and workflow standards. Code
+style conventions are in separate documents:
+
+- [Code Styleguide](https://git.eeqj.de/sneak/prompts/raw/branch/main/prompts/CODE_STYLEGUIDE.md)
+  (general, bash, Docker)
+- [Go](https://git.eeqj.de/sneak/prompts/raw/branch/main/prompts/CODE_STYLEGUIDE_GO.md)
+- [JavaScript](https://git.eeqj.de/sneak/prompts/raw/branch/main/prompts/CODE_STYLEGUIDE_JS.md)
+- [Python](https://git.eeqj.de/sneak/prompts/raw/branch/main/prompts/CODE_STYLEGUIDE_PYTHON.md)
+- [Go HTTP Server Conventions](https://git.eeqj.de/sneak/prompts/raw/branch/main/prompts/GO_HTTP_SERVER_CONVENTIONS.md)
+
+---
+
+- Cross-project documentation (such as this file) must include
+  `last_modified: YYYY-MM-DD` in the YAML front matter so it can be kept in sync
+  with the authoritative source as policies evolve.
+
+- **ALL external references must be pinned by cryptographic hash.** This
+  includes Docker base images, Go modules, npm packages, GitHub Actions, and
+  anything else fetched from a remote source. Version tags (`@v4`, `@latest`,
+  `:3.21`, etc.) are server-mutable and therefore remote code execution
+  vulnerabilities. The ONLY acceptable way to reference an external dependency
+  is by its content hash (Docker `@sha256:...`, Go module hash in `go.sum`, npm
+  integrity hash in lockfile, GitHub Actions `@<commit-sha>`). No exceptions.
+  This also means never `curl | bash` to install tools like pyenv, nvm, rustup,
+  etc. Instead, download a specific release archive from GitHub, verify its hash
+  (hardcoded in the Dockerfile or script), and only then install. Unverified
+  install scripts are arbitrary remote code execution. This is the single most
+  important rule in this document. Double-check every external reference in
+  every file before committing. There are zero exceptions to this rule.
+
+- Every repo with software must have a root `Makefile` with these targets:
+  `make test`, `make lint`, `make fmt` (writes), `make fmt-check` (read-only),
+  `make check` (prereqs: `test`, `lint`, `fmt-check`), `make docker`, and
+  `make hooks` (installs pre-commit hook). A model Makefile is at
+  `https://git.eeqj.de/sneak/prompts/raw/branch/main/Makefile`.
+
+- Always use Makefile targets (`make fmt`, `make test`, `make lint`, etc.)
+  instead of invoking the underlying tools directly. The Makefile is the single
+  source of truth for how these operations are run.
+
+- The Makefile is authoritative documentation for how the repo is used. Beyond
+  the required targets above, it should have targets for every common operation:
+  running a local development server (`make run`, `make dev`), re-initializing
+  or migrating the database (`make db-reset`, `make migrate`), building
+  artifacts (`make build`), generating code, seeding data, or anything else a
+  developer would do regularly. If someone checks out the repo and types
+  `make<tab>`, they should see every meaningful operation available. A new
+  contributor should be able to understand the entire development workflow by
+  reading the Makefile.
+
+- Every repo should have a `Dockerfile`. All Dockerfiles must run `make check`
+  as a build step so the build fails if the branch is not green. For non-server
+  repos, the Dockerfile should bring up a development environment and run
+  `make check`. For server repos, `make check` should run as an early build
+  stage before the final image is assembled.
+
+- Every repo should have a Gitea Actions workflow (`.gitea/workflows/`) that
+  runs `docker build .` on push. Since the Dockerfile already runs `make check`,
+  a successful build implies all checks pass.
+
+- Use platform-standard formatters: `black` for Python, `prettier` for
+  JS/CSS/Markdown/HTML, `go fmt` for Go. Always use default configuration with
+  two exceptions: four-space indents (except Go), and `proseWrap: always` for
+  Markdown (hard-wrap at 80 columns). Documentation and writing repos (Markdown,
+  HTML, CSS) should also have `.prettierrc` and `.prettierignore`.
+
+- Pre-commit hook: `make check` if local testing is possible, otherwise
+  `make lint && make fmt-check`. The Makefile should provide a `make hooks`
+  target to install the pre-commit hook.
+
+- All repos with software must have tests that run via the platform-standard
+  test framework (`go test`, `pytest`, `jest`/`vitest`, etc.). If no meaningful
+  tests exist yet, add the most minimal test possible — e.g. importing the
+  module under test to verify it compiles/parses. There is no excuse for
+  `make test` to be a no-op.
+
+- `make test` must complete in under 20 seconds. Add a 30-second timeout in the
+  Makefile.
+
+- Docker builds must complete in under 5 minutes.
+
+- `make check` must not modify any files in the repo. Tests may use temporary
+  directories.
+
+- `main` must always pass `make check`, no exceptions.
+
+- Never commit secrets. `.env` files, credentials, API keys, and private keys
+  must be in `.gitignore`. No exceptions.
+
+- `.gitignore` should be comprehensive from the start: OS files (`.DS_Store`),
+  editor files (`.swp`, `*~`), language build artifacts, and `node_modules/`.
+  Fetch the standard `.gitignore` from
+  `https://git.eeqj.de/sneak/prompts/raw/branch/main/.gitignore` when setting up
+  a new repo.
+
+- Never use `git add -A` or `git add .`. Always stage files explicitly by name.
+
+- Never force-push to `main`.
+
+- Make all changes on a feature branch. You can do whatever you want on a
+  feature branch.
+
+- `.golangci.yml` is standardized and must _NEVER_ be modified by an agent, only
+  manually by the user. Fetch from
+  `https://git.eeqj.de/sneak/prompts/raw/branch/main/.golangci.yml`.
+
+- When pinning images or packages by hash, add a comment above the reference
+  with the version and date (YYYY-MM-DD).
+
+- Use `yarn`, not `npm`.
+
+- Write all dates as YYYY-MM-DD (ISO 8601).
+
+- Simple projects should be configured with environment variables.
+
+- Dockerized web services listen on port 8080 by default, overridable with
+  `PORT`.
+
+- `README.md` is the primary documentation. Required sections:
+    - **Description**: First line must include the project name, purpose,
+      category (web server, SPA, CLI tool, etc.), license, and author. Example:
+      "µPaaS is an MIT-licensed Go web application by @sneak that receives
+      git-frontend webhooks and deploys applications via Docker in realtime."
+    - **Getting Started**: Copy-pasteable install/usage code block.
+    - **Rationale**: Why does this exist?
+    - **Design**: How is the program structured?
+    - **TODO**: Update meticulously, even between commits. When planning, put
+      the todo list in the README so a new agent can pick up where the last one
+      left off.
+    - **License**: MIT, GPL, or WTFPL. Ask the user for new projects. Include a
+      `LICENSE` file in the repo root and a License section in the README.
+    - **Author**: [@sneak](https://sneak.berlin).
+
+- First commit of a new repo should contain only `README.md`.
+
+- Go module root: `sneak.berlin/go/<name>`. Always run `go mod tidy` before
+  committing.
+
+- Use SemVer.
+
+- Database migrations live in `internal/db/migrations/` and must be embedded in
+  the binary. Pre-1.0.0: modify existing migrations (no installed base assumed).
+  Post-1.0.0: add new migration files.
+
+- All repos should have an `.editorconfig` enforcing the project's indentation
+  settings.
+
+- Avoid putting files in the repo root unless necessary. Root should contain
+  only project-level config files (`README.md`, `Makefile`, `Dockerfile`,
+  `LICENSE`, `.gitignore`, `.editorconfig`, `REPO_POLICIES.md`, and
+  language-specific config). Everything else goes in a subdirectory. Canonical
+  subdirectory names:
+    - `bin/` — executable scripts and tools
+    - `cmd/` — Go command entrypoints
+    - `configs/` — configuration templates and examples
+    - `deploy/` — deployment manifests (k8s, compose, terraform)
+    - `docs/` — documentation and markdown (README.md stays in root)
+    - `internal/` — Go internal packages
+    - `internal/db/migrations/` — database migrations
+    - `pkg/` — Go library packages
+    - `share/` — systemd units, data files
+    - `static/` — static assets (images, fonts, etc.)
+    - `web/` — web frontend source
+
+- When setting up a new repo, files from the `prompts` repo may be used as
+  templates. Fetch them from
+  `https://git.eeqj.de/sneak/prompts/raw/branch/main/<path>`.
+
+- New repos must contain at minimum:
+    - `README.md`, `.git`, `.gitignore`, `.editorconfig`
+    - `LICENSE`, `REPO_POLICIES.md` (copy from the `prompts` repo)
+    - `Makefile`
+    - `Dockerfile`, `.dockerignore`
+    - `.gitea/workflows/check.yml`
+    - Go: `go.mod`, `go.sum`, `.golangci.yml`
+    - JS: `package.json`, `yarn.lock`, `.prettierrc`, `.prettierignore`
+    - Python: `pyproject.toml`

cmd/chat-cli/api/client.go

@@ -0,0 +1,314 @@
+// Package chatapi provides a client for the chat server API.
+package chatapi
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"net/http"
+	"net/url"
+	"strconv"
+	"strings"
+	"time"
+)
+
+const (
+	httpTimeout      = 30 * time.Second
+	pollExtraTime    = 5
+	httpErrThreshold = 400
+)
+
+var errHTTP = errors.New("HTTP error")
+
+// Client wraps HTTP calls to the chat server API.
+type Client struct {
+	BaseURL    string
+	Token      string
+	HTTPClient *http.Client
+}
+
+// NewClient creates a new API client.
+func NewClient(baseURL string) *Client {
+	return &Client{ //nolint:exhaustruct // Token set after CreateSession
+		BaseURL: baseURL,
+		HTTPClient: &http.Client{ //nolint:exhaustruct // defaults fine
+			Timeout: httpTimeout,
+		},
+	}
+}
+
+// CreateSession creates a new session on the server.
+func (client *Client) CreateSession(
+	nick string,
+) (*SessionResponse, error) {
+	data, err := client.do(
+		http.MethodPost,
+		"/api/v1/session",
+		&SessionRequest{Nick: nick},
+	)
+	if err != nil {
+		return nil, err
+	}
+
+	var resp SessionResponse
+
+	err = json.Unmarshal(data, &resp)
+	if err != nil {
+		return nil, fmt.Errorf("decode session: %w", err)
+	}
+
+	client.Token = resp.Token
+
+	return &resp, nil
+}
+
+// GetState returns the current user state.
+func (client *Client) GetState() (*StateResponse, error) {
+	data, err := client.do(
+		http.MethodGet, "/api/v1/state", nil,
+	)
+	if err != nil {
+		return nil, err
+	}
+
+	var resp StateResponse
+
+	err = json.Unmarshal(data, &resp)
+	if err != nil {
+		return nil, fmt.Errorf("decode state: %w", err)
+	}
+
+	return &resp, nil
+}
+
+// SendMessage sends a message (any IRC command).
+func (client *Client) SendMessage(msg *Message) error {
+	_, err := client.do(
+		http.MethodPost, "/api/v1/messages", msg,
+	)
+
+	return err
+}
+
+// PollMessages long-polls for new messages.
+func (client *Client) PollMessages(
+	afterID int64,
+	timeout int,
+) (*PollResult, error) {
+	pollClient := &http.Client{ //nolint:exhaustruct // defaults fine
+		Timeout: time.Duration(
+			timeout+pollExtraTime,
+		) * time.Second,
+	}
+
+	params := url.Values{}
+	if afterID > 0 {
+		params.Set(
+			"after",
+			strconv.FormatInt(afterID, 10),
+		)
+	}
+
+	params.Set("timeout", strconv.Itoa(timeout))
+
+	path := "/api/v1/messages?" + params.Encode()
+
+	request, err := http.NewRequestWithContext(
+		context.Background(),
+		http.MethodGet,
+		client.BaseURL+path,
+		nil,
+	)
+	if err != nil {
+		return nil, fmt.Errorf("new request: %w", err)
+	}
+
+	request.Header.Set(
+		"Authorization", "Bearer "+client.Token,
+	)
+
+	resp, err := pollClient.Do(request)
+	if err != nil {
+		return nil, fmt.Errorf("poll request: %w", err)
+	}
+
+	defer func() { _ = resp.Body.Close() }()
+
+	data, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return nil, fmt.Errorf("read poll body: %w", err)
+	}
+
+	if resp.StatusCode >= httpErrThreshold {
+		return nil, fmt.Errorf(
+			"%w %d: %s",
+			errHTTP, resp.StatusCode, string(data),
+		)
+	}
+
+	var wrapped MessagesResponse
+
+	err = json.Unmarshal(data, &wrapped)
+	if err != nil {
+		return nil, fmt.Errorf(
+			"decode messages: %w", err,
+		)
+	}
+
+	return &PollResult{
+		Messages: wrapped.Messages,
+		LastID:   wrapped.LastID,
+	}, nil
+}
+
+// JoinChannel joins a channel.
+func (client *Client) JoinChannel(channel string) error {
+	return client.SendMessage(
+		&Message{ //nolint:exhaustruct // only command+to needed
+			Command: "JOIN", To: channel,
+		},
+	)
+}
+
+// PartChannel leaves a channel.
+func (client *Client) PartChannel(channel string) error {
+	return client.SendMessage(
+		&Message{ //nolint:exhaustruct // only command+to needed
+			Command: "PART", To: channel,
+		},
+	)
+}
+
+// ListChannels returns all channels on the server.
+func (client *Client) ListChannels() (
+	[]Channel, error,
+) {
+	data, err := client.do(
+		http.MethodGet, "/api/v1/channels", nil,
+	)
+	if err != nil {
+		return nil, err
+	}
+
+	var channels []Channel
+
+	err = json.Unmarshal(data, &channels)
+	if err != nil {
+		return nil, fmt.Errorf(
+			"decode channels: %w", err,
+		)
+	}
+
+	return channels, nil
+}
+
+// GetMembers returns members of a channel.
+func (client *Client) GetMembers(
+	channel string,
+) ([]string, error) {
+	name := strings.TrimPrefix(channel, "#")
+
+	data, err := client.do(
+		http.MethodGet,
+		"/api/v1/channels/"+url.PathEscape(name)+
+			"/members",
+		nil,
+	)
+	if err != nil {
+		return nil, err
+	}
+
+	var members []string
+
+	err = json.Unmarshal(data, &members)
+	if err != nil {
+		return nil, fmt.Errorf(
+			"unexpected members format: %w", err,
+		)
+	}
+
+	return members, nil
+}
+
+// GetServerInfo returns server info.
+func (client *Client) GetServerInfo() (
+	*ServerInfo, error,
+) {
+	data, err := client.do(
+		http.MethodGet, "/api/v1/server", nil,
+	)
+	if err != nil {
+		return nil, err
+	}
+
+	var info ServerInfo
+
+	err = json.Unmarshal(data, &info)
+	if err != nil {
+		return nil, fmt.Errorf(
+			"decode server info: %w", err,
+		)
+	}
+
+	return &info, nil
+}
+
+func (client *Client) do(
+	method, path string,
+	body any,
+) ([]byte, error) {
+	var bodyReader io.Reader
+
+	if body != nil {
+		data, err := json.Marshal(body)
+		if err != nil {
+			return nil, fmt.Errorf("marshal: %w", err)
+		}
+
+		bodyReader = bytes.NewReader(data)
+	}
+
+	request, err := http.NewRequestWithContext(
+		context.Background(),
+		method,
+		client.BaseURL+path,
+		bodyReader,
+	)
+	if err != nil {
+		return nil, fmt.Errorf("request: %w", err)
+	}
+
+	request.Header.Set(
+		"Content-Type", "application/json",
+	)
+
+	if client.Token != "" {
+		request.Header.Set(
+			"Authorization", "Bearer "+client.Token,
+		)
+	}
+
+	resp, err := client.HTTPClient.Do(request)
+	if err != nil {
+		return nil, fmt.Errorf("http: %w", err)
+	}
+
+	defer func() { _ = resp.Body.Close() }()
+
+	data, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return nil, fmt.Errorf("read body: %w", err)
+	}
+
+	if resp.StatusCode >= httpErrThreshold {
+		return data, fmt.Errorf(
+			"%w %d: %s",
+			errHTTP, resp.StatusCode, string(data),
+		)
+	}
+
+	return data, nil
+}

cmd/chat-cli/api/types.go

@@ -0,0 +1,91 @@
+package chatapi
+
+import "time"
+
+// SessionRequest is the body for POST /api/v1/session.
+type SessionRequest struct {
+	Nick string `json:"nick"`
+}
+
+// SessionResponse is the response from session creation.
+type SessionResponse struct {
+	ID    int64  `json:"id"`
+	Nick  string `json:"nick"`
+	Token string `json:"token"`
+}
+
+// StateResponse is the response from GET /api/v1/state.
+type StateResponse struct {
+	ID       int64    `json:"id"`
+	Nick     string   `json:"nick"`
+	Channels []string `json:"channels"`
+}
+
+// Message represents a chat message envelope.
+type Message struct {
+	Command string   `json:"command"`
+	From    string   `json:"from,omitempty"`
+	To      string   `json:"to,omitempty"`
+	Params  []string `json:"params,omitempty"`
+	Body    any      `json:"body,omitempty"`
+	ID      string   `json:"id,omitempty"`
+	TS      string   `json:"ts,omitempty"`
+	Meta    any      `json:"meta,omitempty"`
+}
+
+// BodyLines returns the body as a string slice.
+func (m *Message) BodyLines() []string {
+	switch bodyVal := m.Body.(type) {
+	case []any:
+		lines := make([]string, 0, len(bodyVal))
+
+		for _, item := range bodyVal {
+			if str, ok := item.(string); ok {
+				lines = append(lines, str)
+			}
+		}
+
+		return lines
+	case []string:
+		return bodyVal
+	default:
+		return nil
+	}
+}
+
+// Channel represents a channel in the list response.
+type Channel struct {
+	Name      string `json:"name"`
+	Topic     string `json:"topic"`
+	Members   int    `json:"members"`
+	CreatedAt string `json:"createdAt"`
+}
+
+// ServerInfo is the response from GET /api/v1/server.
+type ServerInfo struct {
+	Name    string `json:"name"`
+	MOTD    string `json:"motd"`
+	Version string `json:"version"`
+}
+
+// MessagesResponse wraps polling results.
+type MessagesResponse struct {
+	Messages []Message `json:"messages"`
+	LastID   int64     `json:"lastId"`
+}
+
+// PollResult wraps the poll response including the cursor.
+type PollResult struct {
+	Messages []Message
+	LastID   int64
+}
+
+// ParseTS parses the message timestamp.
+func (m *Message) ParseTS() time.Time {
+	t, err := time.Parse(time.RFC3339Nano, m.TS)
+	if err != nil {
+		return time.Now()
+	}
+
+	return t
+}

cmd/chat-cli/main.go

@@ -0,0 +1,804 @@
+// Package main is the entry point for the chat-cli client.
+package main
+
+import (
+	"fmt"
+	"os"
+	"strings"
+	"sync"
+	"time"
+
+	api "git.eeqj.de/sneak/chat/cmd/chat-cli/api"
+)
+
+const (
+	splitParts  = 2
+	pollTimeout = 15
+	pollRetry   = 2 * time.Second
+	timeFormat  = "15:04"
+)
+
+// App holds the application state.
+type App struct {
+	ui     *UI
+	client *api.Client
+
+	mu        sync.Mutex
+	nick      string
+	target    string
+	connected bool
+	lastQID   int64
+	stopPoll  chan struct{}
+}
+
+func main() {
+	app := &App{ //nolint:exhaustruct
+		ui:   NewUI(),
+		nick: "guest",
+	}
+
+	app.ui.OnInput(app.handleInput)
+	app.ui.SetStatus(app.nick, "", "disconnected")
+
+	app.ui.AddStatus(
+		"Welcome to chat-cli — an IRC-style client",
+	)
+	app.ui.AddStatus(
+		"Type [yellow]/connect <server-url>" +
+			"[white] to begin, " +
+			"or [yellow]/help[white] for commands",
+	)
+
+	err := app.ui.Run()
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Error: %v\n", err)
+		os.Exit(1)
+	}
+}
+
+func (a *App) handleInput(text string) {
+	if strings.HasPrefix(text, "/") {
+		a.handleCommand(text)
+
+		return
+	}
+
+	a.mu.Lock()
+	target := a.target
+	connected := a.connected
+	a.mu.Unlock()
+
+	if !connected {
+		a.ui.AddStatus(
+			"[red]Not connected. Use /connect <url>",
+		)
+
+		return
+	}
+
+	if target == "" {
+		a.ui.AddStatus(
+			"[red]No target. " +
+				"Use /join #channel or /query nick",
+		)
+
+		return
+	}
+
+	err := a.client.SendMessage(&api.Message{ //nolint:exhaustruct
+		Command: "PRIVMSG",
+		To:      target,
+		Body:    []string{text},
+	})
+	if err != nil {
+		a.ui.AddStatus(
+			"[red]Send error: " + err.Error(),
+		)
+
+		return
+	}
+
+	timestamp := time.Now().Format(timeFormat)
+
+	a.mu.Lock()
+	nick := a.nick
+	a.mu.Unlock()
+
+	a.ui.AddLine(target, fmt.Sprintf(
+		"[gray]%s [green]<%s>[white] %s",
+		timestamp, nick, text,
+	))
+}
+
+func (a *App) handleCommand(text string) {
+	parts := strings.SplitN(text, " ", splitParts)
+	cmd := strings.ToLower(parts[0])
+
+	args := ""
+	if len(parts) > 1 {
+		args = parts[1]
+	}
+
+	a.dispatchCommand(cmd, args)
+}
+
+func (a *App) dispatchCommand(cmd, args string) {
+	switch cmd {
+	case "/connect":
+		a.cmdConnect(args)
+	case "/nick":
+		a.cmdNick(args)
+	case "/join":
+		a.cmdJoin(args)
+	case "/part":
+		a.cmdPart(args)
+	case "/msg":
+		a.cmdMsg(args)
+	case "/query":
+		a.cmdQuery(args)
+	case "/topic":
+		a.cmdTopic(args)
+	case "/names":
+		a.cmdNames()
+	case "/list":
+		a.cmdList()
+	case "/window", "/w":
+		a.cmdWindow(args)
+	case "/quit":
+		a.cmdQuit()
+	case "/help":
+		a.cmdHelp()
+	default:
+		a.ui.AddStatus(
+			"[red]Unknown command: " + cmd,
+		)
+	}
+}
+
+func (a *App) cmdConnect(serverURL string) {
+	if serverURL == "" {
+		a.ui.AddStatus(
+			"[red]Usage: /connect <server-url>",
+		)
+
+		return
+	}
+
+	serverURL = strings.TrimRight(serverURL, "/")
+
+	a.ui.AddStatus("Connecting to " + serverURL + "...")
+
+	a.mu.Lock()
+	nick := a.nick
+	a.mu.Unlock()
+
+	client := api.NewClient(serverURL)
+
+	resp, err := client.CreateSession(nick)
+	if err != nil {
+		a.ui.AddStatus(fmt.Sprintf(
+			"[red]Connection failed: %v", err,
+		))
+
+		return
+	}
+
+	a.mu.Lock()
+	a.client = client
+	a.nick = resp.Nick
+	a.connected = true
+	a.lastQID = 0
+	a.mu.Unlock()
+
+	a.ui.AddStatus(fmt.Sprintf(
+		"[green]Connected! Nick: %s, Session: %d",
+		resp.Nick, resp.ID,
+	))
+	a.ui.SetStatus(resp.Nick, "", "connected")
+
+	a.stopPoll = make(chan struct{})
+
+	go a.pollLoop()
+}
+
+func (a *App) cmdNick(nick string) {
+	if nick == "" {
+		a.ui.AddStatus(
+			"[red]Usage: /nick <name>",
+		)
+
+		return
+	}
+
+	a.mu.Lock()
+	connected := a.connected
+	a.mu.Unlock()
+
+	if !connected {
+		a.mu.Lock()
+		a.nick = nick
+		a.mu.Unlock()
+
+		a.ui.AddStatus(
+			"Nick set to " + nick +
+				" (will be used on connect)",
+		)
+
+		return
+	}
+
+	err := a.client.SendMessage(&api.Message{ //nolint:exhaustruct
+		Command: "NICK",
+		Body:    []string{nick},
+	})
+	if err != nil {
+		a.ui.AddStatus(fmt.Sprintf(
+			"[red]Nick change failed: %v", err,
+		))
+
+		return
+	}
+
+	a.mu.Lock()
+	a.nick = nick
+	target := a.target
+	a.mu.Unlock()
+
+	a.ui.SetStatus(nick, target, "connected")
+	a.ui.AddStatus("Nick changed to " + nick)
+}
+
+func (a *App) cmdJoin(channel string) {
+	if channel == "" {
+		a.ui.AddStatus(
+			"[red]Usage: /join #channel",
+		)
+
+		return
+	}
+
+	if !strings.HasPrefix(channel, "#") {
+		channel = "#" + channel
+	}
+
+	a.mu.Lock()
+	connected := a.connected
+	a.mu.Unlock()
+
+	if !connected {
+		a.ui.AddStatus("[red]Not connected")
+
+		return
+	}
+
+	err := a.client.JoinChannel(channel)
+	if err != nil {
+		a.ui.AddStatus(fmt.Sprintf(
+			"[red]Join failed: %v", err,
+		))
+
+		return
+	}
+
+	a.mu.Lock()
+	a.target = channel
+	nick := a.nick
+	a.mu.Unlock()
+
+	a.ui.SwitchToBuffer(channel)
+	a.ui.AddLine(channel,
+		"[yellow]*** Joined "+channel,
+	)
+	a.ui.SetStatus(nick, channel, "connected")
+}
+
+func (a *App) cmdPart(channel string) {
+	a.mu.Lock()
+	if channel == "" {
+		channel = a.target
+	}
+
+	connected := a.connected
+	a.mu.Unlock()
+
+	if channel == "" ||
+		!strings.HasPrefix(channel, "#") {
+		a.ui.AddStatus("[red]No channel to part")
+
+		return
+	}
+
+	if !connected {
+		a.ui.AddStatus("[red]Not connected")
+
+		return
+	}
+
+	err := a.client.PartChannel(channel)
+	if err != nil {
+		a.ui.AddStatus(fmt.Sprintf(
+			"[red]Part failed: %v", err,
+		))
+
+		return
+	}
+
+	a.ui.AddLine(channel,
+		"[yellow]*** Left "+channel,
+	)
+
+	a.mu.Lock()
+	if a.target == channel {
+		a.target = ""
+	}
+
+	nick := a.nick
+	a.mu.Unlock()
+
+	a.ui.SwitchBuffer(0)
+	a.ui.SetStatus(nick, "", "connected")
+}
+
+func (a *App) cmdMsg(args string) {
+	parts := strings.SplitN(args, " ", splitParts)
+	if len(parts) < splitParts {
+		a.ui.AddStatus(
+			"[red]Usage: /msg <nick> <text>",
+		)
+
+		return
+	}
+
+	target, text := parts[0], parts[1]
+
+	a.mu.Lock()
+	connected := a.connected
+	nick := a.nick
+	a.mu.Unlock()
+
+	if !connected {
+		a.ui.AddStatus("[red]Not connected")
+
+		return
+	}
+
+	err := a.client.SendMessage(&api.Message{ //nolint:exhaustruct
+		Command: "PRIVMSG",
+		To:      target,
+		Body:    []string{text},
+	})
+	if err != nil {
+		a.ui.AddStatus(fmt.Sprintf(
+			"[red]Send failed: %v", err,
+		))
+
+		return
+	}
+
+	timestamp := time.Now().Format(timeFormat)
+
+	a.ui.AddLine(target, fmt.Sprintf(
+		"[gray]%s [green]<%s>[white] %s",
+		timestamp, nick, text,
+	))
+}
+
+func (a *App) cmdQuery(nick string) {
+	if nick == "" {
+		a.ui.AddStatus(
+			"[red]Usage: /query <nick>",
+		)
+
+		return
+	}
+
+	a.mu.Lock()
+	a.target = nick
+	myNick := a.nick
+	a.mu.Unlock()
+
+	a.ui.SwitchToBuffer(nick)
+	a.ui.SetStatus(myNick, nick, "connected")
+}
+
+func (a *App) cmdTopic(args string) {
+	a.mu.Lock()
+	target := a.target
+	connected := a.connected
+	a.mu.Unlock()
+
+	if !connected {
+		a.ui.AddStatus("[red]Not connected")
+
+		return
+	}
+
+	if !strings.HasPrefix(target, "#") {
+		a.ui.AddStatus("[red]Not in a channel")
+
+		return
+	}
+
+	if args == "" {
+		err := a.client.SendMessage(&api.Message{ //nolint:exhaustruct
+			Command: "TOPIC",
+			To:      target,
+		})
+		if err != nil {
+			a.ui.AddStatus(fmt.Sprintf(
+				"[red]Topic query failed: %v", err,
+			))
+		}
+
+		return
+	}
+
+	err := a.client.SendMessage(&api.Message{ //nolint:exhaustruct
+		Command: "TOPIC",
+		To:      target,
+		Body:    []string{args},
+	})
+	if err != nil {
+		a.ui.AddStatus(fmt.Sprintf(
+			"[red]Topic set failed: %v", err,
+		))
+	}
+}
+
+func (a *App) cmdNames() {
+	a.mu.Lock()
+	target := a.target
+	connected := a.connected
+	a.mu.Unlock()
+
+	if !connected {
+		a.ui.AddStatus("[red]Not connected")
+
+		return
+	}
+
+	if !strings.HasPrefix(target, "#") {
+		a.ui.AddStatus("[red]Not in a channel")
+
+		return
+	}
+
+	members, err := a.client.GetMembers(target)
+	if err != nil {
+		a.ui.AddStatus(fmt.Sprintf(
+			"[red]Names failed: %v", err,
+		))
+
+		return
+	}
+
+	a.ui.AddLine(target, fmt.Sprintf(
+		"[cyan]*** Members of %s: %s",
+		target, strings.Join(members, " "),
+	))
+}
+
+func (a *App) cmdList() {
+	a.mu.Lock()
+	connected := a.connected
+	a.mu.Unlock()
+
+	if !connected {
+		a.ui.AddStatus("[red]Not connected")
+
+		return
+	}
+
+	channels, err := a.client.ListChannels()
+	if err != nil {
+		a.ui.AddStatus(fmt.Sprintf(
+			"[red]List failed: %v", err,
+		))
+
+		return
+	}
+
+	a.ui.AddStatus("[cyan]*** Channel list:")
+
+	for _, ch := range channels {
+		a.ui.AddStatus(fmt.Sprintf(
+			"  %s (%d members) %s",
+			ch.Name, ch.Members, ch.Topic,
+		))
+	}
+
+	a.ui.AddStatus("[cyan]*** End of channel list")
+}
+
+func (a *App) cmdWindow(args string) {
+	if args == "" {
+		a.ui.AddStatus(
+			"[red]Usage: /window <number>",
+		)
+
+		return
+	}
+
+	var bufIndex int
+
+	_, _ = fmt.Sscanf(args, "%d", &bufIndex)
+
+	a.ui.SwitchBuffer(bufIndex)
+
+	a.mu.Lock()
+	nick := a.nick
+	a.mu.Unlock()
+
+	if bufIndex >= 0 && bufIndex < a.ui.BufferCount() {
+		buf := a.ui.buffers[bufIndex]
+		if buf.Name != "(status)" {
+			a.mu.Lock()
+			a.target = buf.Name
+			a.mu.Unlock()
+
+			a.ui.SetStatus(
+				nick, buf.Name, "connected",
+			)
+		} else {
+			a.ui.SetStatus(nick, "", "connected")
+		}
+	}
+}
+
+func (a *App) cmdQuit() {
+	a.mu.Lock()
+
+	if a.connected && a.client != nil {
+		_ = a.client.SendMessage(
+			&api.Message{Command: "QUIT"}, //nolint:exhaustruct
+		)
+	}
+
+	if a.stopPoll != nil {
+		close(a.stopPoll)
+	}
+
+	a.mu.Unlock()
+	a.ui.Stop()
+}
+
+func (a *App) cmdHelp() {
+	help := []string{
+		"[cyan]*** chat-cli commands:",
+		"  /connect <url>  — Connect to server",
+		"  /nick <name>    — Change nickname",
+		"  /join #channel  — Join channel",
+		"  /part [#chan]    — Leave channel",
+		"  /msg <nick> <text> — Send DM",
+		"  /query <nick>   — Open DM window",
+		"  /topic [text]   — View/set topic",
+		"  /names          — List channel members",
+		"  /list           — List channels",
+		"  /window <n>     — Switch buffer",
+		"  /quit           — Disconnect and exit",
+		"  /help           — This help",
+		"  Plain text sends to current target.",
+	}
+
+	for _, line := range help {
+		a.ui.AddStatus(line)
+	}
+}
+
+// pollLoop long-polls for messages in the background.
+func (a *App) pollLoop() {
+	for {
+		select {
+		case <-a.stopPoll:
+			return
+		default:
+		}
+
+		a.mu.Lock()
+		client := a.client
+		lastQID := a.lastQID
+		a.mu.Unlock()
+
+		if client == nil {
+			return
+		}
+
+		result, err := client.PollMessages(
+			lastQID, pollTimeout,
+		)
+		if err != nil {
+			time.Sleep(pollRetry)
+
+			continue
+		}
+
+		if result.LastID > 0 {
+			a.mu.Lock()
+			a.lastQID = result.LastID
+			a.mu.Unlock()
+		}
+
+		for i := range result.Messages {
+			a.handleServerMessage(&result.Messages[i])
+		}
+	}
+}
+
+func (a *App) handleServerMessage(msg *api.Message) {
+	timestamp := a.formatTS(msg)
+
+	a.mu.Lock()
+	myNick := a.nick
+	a.mu.Unlock()
+
+	switch msg.Command {
+	case "PRIVMSG":
+		a.handlePrivmsgEvent(msg, timestamp, myNick)
+	case "JOIN":
+		a.handleJoinEvent(msg, timestamp)
+	case "PART":
+		a.handlePartEvent(msg, timestamp)
+	case "QUIT":
+		a.handleQuitEvent(msg, timestamp)
+	case "NICK":
+		a.handleNickEvent(msg, timestamp, myNick)
+	case "NOTICE":
+		a.handleNoticeEvent(msg, timestamp)
+	case "TOPIC":
+		a.handleTopicEvent(msg, timestamp)
+	default:
+		a.handleDefaultEvent(msg, timestamp)
+	}
+}
+
+func (a *App) formatTS(msg *api.Message) string {
+	if msg.TS != "" {
+		return msg.ParseTS().UTC().Format(timeFormat)
+	}
+
+	return time.Now().Format(timeFormat)
+}
+
+func (a *App) handlePrivmsgEvent(
+	msg *api.Message, timestamp, myNick string,
+) {
+	lines := msg.BodyLines()
+	text := strings.Join(lines, " ")
+
+	if msg.From == myNick {
+		return
+	}
+
+	target := msg.To
+	if !strings.HasPrefix(target, "#") {
+		target = msg.From
+	}
+
+	a.ui.AddLine(target, fmt.Sprintf(
+		"[gray]%s [green]<%s>[white] %s",
+		timestamp, msg.From, text,
+	))
+}
+
+func (a *App) handleJoinEvent(
+	msg *api.Message, timestamp string,
+) {
+	if msg.To == "" {
+		return
+	}
+
+	a.ui.AddLine(msg.To, fmt.Sprintf(
+		"[gray]%s [yellow]*** %s has joined %s",
+		timestamp, msg.From, msg.To,
+	))
+}
+
+func (a *App) handlePartEvent(
+	msg *api.Message, timestamp string,
+) {
+	if msg.To == "" {
+		return
+	}
+
+	lines := msg.BodyLines()
+	reason := strings.Join(lines, " ")
+
+	if reason != "" {
+		a.ui.AddLine(msg.To, fmt.Sprintf(
+			"[gray]%s [yellow]*** %s has left %s (%s)",
+			timestamp, msg.From, msg.To, reason,
+		))
+	} else {
+		a.ui.AddLine(msg.To, fmt.Sprintf(
+			"[gray]%s [yellow]*** %s has left %s",
+			timestamp, msg.From, msg.To,
+		))
+	}
+}
+
+func (a *App) handleQuitEvent(
+	msg *api.Message, timestamp string,
+) {
+	lines := msg.BodyLines()
+	reason := strings.Join(lines, " ")
+
+	if reason != "" {
+		a.ui.AddStatus(fmt.Sprintf(
+			"[gray]%s [yellow]*** %s has quit (%s)",
+			timestamp, msg.From, reason,
+		))
+	} else {
+		a.ui.AddStatus(fmt.Sprintf(
+			"[gray]%s [yellow]*** %s has quit",
+			timestamp, msg.From,
+		))
+	}
+}
+
+func (a *App) handleNickEvent(
+	msg *api.Message, timestamp, myNick string,
+) {
+	lines := msg.BodyLines()
+
+	newNick := ""
+	if len(lines) > 0 {
+		newNick = lines[0]
+	}
+
+	if msg.From == myNick && newNick != "" {
+		a.mu.Lock()
+		a.nick = newNick
+
+		target := a.target
+		a.mu.Unlock()
+
+		a.ui.SetStatus(newNick, target, "connected")
+	}
+
+	a.ui.AddStatus(fmt.Sprintf(
+		"[gray]%s [yellow]*** %s is now known as %s",
+		timestamp, msg.From, newNick,
+	))
+}
+
+func (a *App) handleNoticeEvent(
+	msg *api.Message, timestamp string,
+) {
+	lines := msg.BodyLines()
+	text := strings.Join(lines, " ")
+
+	a.ui.AddStatus(fmt.Sprintf(
+		"[gray]%s [magenta]--%s-- %s",
+		timestamp, msg.From, text,
+	))
+}
+
+func (a *App) handleTopicEvent(
+	msg *api.Message, timestamp string,
+) {
+	if msg.To == "" {
+		return
+	}
+
+	lines := msg.BodyLines()
+	text := strings.Join(lines, " ")
+
+	a.ui.AddLine(msg.To, fmt.Sprintf(
+		"[gray]%s [cyan]*** %s set topic: %s",
+		timestamp, msg.From, text,
+	))
+}
+
+func (a *App) handleDefaultEvent(
+	msg *api.Message, timestamp string,
+) {
+	lines := msg.BodyLines()
+	text := strings.Join(lines, " ")
+
+	if text != "" {
+		a.ui.AddStatus(fmt.Sprintf(
+			"[gray]%s [white][%s] %s",
+			timestamp, msg.Command, text,
+		))
+	}
+}

cmd/chat-cli/ui.go

@@ -0,0 +1,294 @@
+package main
+
+import (
+	"fmt"
+	"strings"
+	"time"
+
+	"github.com/gdamore/tcell/v2"
+	"github.com/rivo/tview"
+)
+
+// Buffer holds messages for a channel/DM/status window.
+type Buffer struct {
+	Name   string
+	Lines  []string
+	Unread int
+}
+
+// UI manages the terminal interface.
+type UI struct {
+	app       *tview.Application
+	messages  *tview.TextView
+	statusBar *tview.TextView
+	input     *tview.InputField
+	layout    *tview.Flex
+
+	buffers       []*Buffer
+	currentBuffer int
+
+	onInput func(string)
+}
+
+// NewUI creates the tview-based IRC-like UI.
+func NewUI() *UI {
+	ui := &UI{ //nolint:exhaustruct,varnamelen // fields set below; ui is idiomatic
+		app: tview.NewApplication(),
+		buffers: []*Buffer{
+			{Name: "(status)", Lines: nil, Unread: 0},
+		},
+	}
+
+	ui.initMessages()
+	ui.initStatusBar()
+	ui.initInput()
+	ui.initKeyCapture()
+
+	ui.layout = tview.NewFlex().
+		SetDirection(tview.FlexRow).
+		AddItem(ui.messages, 0, 1, false).
+		AddItem(ui.statusBar, 1, 0, false).
+		AddItem(ui.input, 1, 0, true)
+
+	ui.app.SetRoot(ui.layout, true)
+	ui.app.SetFocus(ui.input)
+
+	return ui
+}
+
+// Run starts the UI event loop (blocks).
+func (ui *UI) Run() error {
+	err := ui.app.Run()
+	if err != nil {
+		return fmt.Errorf("run ui: %w", err)
+	}
+
+	return nil
+}
+
+// Stop stops the UI.
+func (ui *UI) Stop() {
+	ui.app.Stop()
+}
+
+// OnInput sets the callback for user input.
+func (ui *UI) OnInput(fn func(string)) {
+	ui.onInput = fn
+}
+
+// AddLine adds a line to the specified buffer.
+func (ui *UI) AddLine(bufferName, line string) {
+	ui.app.QueueUpdateDraw(func() {
+		buf := ui.getOrCreateBuffer(bufferName)
+		buf.Lines = append(buf.Lines, line)
+
+		cur := ui.buffers[ui.currentBuffer]
+		if cur != buf {
+			buf.Unread++
+
+			ui.refreshStatusBar()
+		}
+
+		if cur == buf {
+			_, _ = fmt.Fprintln(ui.messages, line)
+		}
+	})
+}
+
+// AddStatus adds a line to the status buffer.
+func (ui *UI) AddStatus(line string) {
+	ts := time.Now().Format("15:04")
+	ui.AddLine(
+		"(status)",
+		"[gray]"+ts+"[white] "+line,
+	)
+}
+
+// SwitchBuffer switches to the buffer at index n.
+func (ui *UI) SwitchBuffer(bufIndex int) {
+	ui.app.QueueUpdateDraw(func() {
+		if bufIndex < 0 || bufIndex >= len(ui.buffers) {
+			return
+		}
+
+		ui.currentBuffer = bufIndex
+
+		buf := ui.buffers[bufIndex]
+		buf.Unread = 0
+
+		ui.messages.Clear()
+
+		for _, line := range buf.Lines {
+			_, _ = fmt.Fprintln(ui.messages, line)
+		}
+
+		ui.messages.ScrollToEnd()
+		ui.refreshStatusBar()
+	})
+}
+
+// SwitchToBuffer switches to named buffer, creating if
+// needed.
+func (ui *UI) SwitchToBuffer(name string) {
+	ui.app.QueueUpdateDraw(func() {
+		buf := ui.getOrCreateBuffer(name)
+
+		for i, b := range ui.buffers {
+			if b == buf {
+				ui.currentBuffer = i
+
+				break
+			}
+		}
+
+		buf.Unread = 0
+
+		ui.messages.Clear()
+
+		for _, line := range buf.Lines {
+			_, _ = fmt.Fprintln(ui.messages, line)
+		}
+
+		ui.messages.ScrollToEnd()
+		ui.refreshStatusBar()
+	})
+}
+
+// SetStatus updates the status bar text.
+func (ui *UI) SetStatus(
+	nick, target, connStatus string,
+) {
+	ui.app.QueueUpdateDraw(func() {
+		ui.renderStatusBar(nick, target, connStatus)
+	})
+}
+
+// BufferCount returns the number of buffers.
+func (ui *UI) BufferCount() int {
+	return len(ui.buffers)
+}
+
+// BufferIndex returns the index of a named buffer.
+func (ui *UI) BufferIndex(name string) int {
+	for i, buf := range ui.buffers {
+		if buf.Name == name {
+			return i
+		}
+	}
+
+	return -1
+}
+
+func (ui *UI) initMessages() {
+	ui.messages = tview.NewTextView().
+		SetDynamicColors(true).
+		SetScrollable(true).
+		SetWordWrap(true).
+		SetChangedFunc(func() {
+			ui.app.Draw()
+		})
+	ui.messages.SetBorder(false)
+}
+
+func (ui *UI) initStatusBar() {
+	ui.statusBar = tview.NewTextView().
+		SetDynamicColors(true)
+	ui.statusBar.SetBackgroundColor(tcell.ColorNavy)
+	ui.statusBar.SetTextColor(tcell.ColorWhite)
+}
+
+func (ui *UI) initInput() {
+	ui.input = tview.NewInputField().
+		SetFieldBackgroundColor(tcell.ColorBlack).
+		SetFieldTextColor(tcell.ColorWhite)
+
+	ui.input.SetDoneFunc(func(key tcell.Key) {
+		if key != tcell.KeyEnter {
+			return
+		}
+
+		text := ui.input.GetText()
+		if text == "" {
+			return
+		}
+
+		ui.input.SetText("")
+
+		if ui.onInput != nil {
+			ui.onInput(text)
+		}
+	})
+}
+
+func (ui *UI) initKeyCapture() {
+	ui.app.SetInputCapture(
+		func(event *tcell.EventKey) *tcell.EventKey {
+			if event.Modifiers()&tcell.ModAlt == 0 {
+				return event
+			}
+
+			r := event.Rune()
+			if r >= '0' && r <= '9' {
+				idx := int(r - '0')
+				ui.SwitchBuffer(idx)
+
+				return nil
+			}
+
+			return event
+		},
+	)
+}
+
+func (ui *UI) refreshStatusBar() {
+	// Placeholder; full refresh needs nick/target context.
+}
+
+func (ui *UI) renderStatusBar(
+	nick, target, connStatus string,
+) {
+	var unreadParts []string
+
+	for i, buf := range ui.buffers {
+		if buf.Unread > 0 {
+			unreadParts = append(unreadParts,
+				fmt.Sprintf(
+					"%d:%s(%d)",
+					i, buf.Name, buf.Unread,
+				),
+			)
+		}
+	}
+
+	unread := ""
+	if len(unreadParts) > 0 {
+		unread = " [Act: " +
+			strings.Join(unreadParts, ",") + "]"
+	}
+
+	bufInfo := fmt.Sprintf(
+		"[%d:%s]",
+		ui.currentBuffer,
+		ui.buffers[ui.currentBuffer].Name,
+	)
+
+	ui.statusBar.Clear()
+
+	_, _ = fmt.Fprintf(ui.statusBar,
+		" [%s] %s %s %s%s",
+		connStatus, nick, bufInfo, target, unread,
+	)
+}
+
+func (ui *UI) getOrCreateBuffer(name string) *Buffer {
+	for _, buf := range ui.buffers {
+		if buf.Name == name {
+			return buf
+		}
+	}
+
+	buf := &Buffer{Name: name, Lines: nil, Unread: 0}
+	ui.buffers = append(ui.buffers, buf)
+
+	return buf
+}

cmd/chatd/main.go

@@ -0,0 +1,41 @@
+// Package main is the entry point for the chatd server.
+package main
+
+import (
+	"git.eeqj.de/sneak/chat/internal/config"
+	"git.eeqj.de/sneak/chat/internal/db"
+	"git.eeqj.de/sneak/chat/internal/globals"
+	"git.eeqj.de/sneak/chat/internal/handlers"
+	"git.eeqj.de/sneak/chat/internal/healthcheck"
+	"git.eeqj.de/sneak/chat/internal/logger"
+	"git.eeqj.de/sneak/chat/internal/middleware"
+	"git.eeqj.de/sneak/chat/internal/server"
+	"go.uber.org/fx"
+)
+
+var (
+	// Appname is the application name, set at build time.
+	Appname = "chat" //nolint:gochecknoglobals
+
+	// Version is the application version, set at build time.
+	Version string //nolint:gochecknoglobals
+)
+
+func main() {
+	globals.Appname = Appname
+	globals.Version = Version
+
+	fx.New(
+		fx.Provide(
+			config.New,
+			db.New,
+			globals.New,
+			handlers.New,
+			logger.New,
+			server.New,
+			middleware.New,
+			healthcheck.New,
+		),
+		fx.Invoke(func(*server.Server) {}),
+	).Run()
+}

go.mod

@@ -20,8 +20,11 @@ require (
 	github.com/cespare/xxhash/v2 v2.3.0 // indirect
 	github.com/dustin/go-humanize v1.0.1 // indirect
 	github.com/fsnotify/fsnotify v1.9.0 // indirect
+	github.com/gdamore/encoding v1.0.1 // indirect
+	github.com/gdamore/tcell/v2 v2.13.8 // indirect
 	github.com/go-viper/mapstructure/v2 v2.4.0 // indirect
 	github.com/google/uuid v1.6.0 // indirect
+	github.com/lucasb-eyer/go-colorful v1.3.0 // indirect
 	github.com/mattn/go-isatty v0.0.20 // indirect
 	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
 	github.com/ncruces/go-strftime v1.0.0 // indirect
@@ -30,6 +33,8 @@ require (
 	github.com/prometheus/common v0.66.1 // indirect
 	github.com/prometheus/procfs v0.16.1 // indirect
 	github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec // indirect
+	github.com/rivo/tview v0.42.0 // indirect
+	github.com/rivo/uniseg v0.4.7 // indirect
 	github.com/sagikazarmark/locafero v0.11.0 // indirect
 	github.com/sourcegraph/conc v0.3.1-0.20240121214520-5f936abd7ae8 // indirect
 	github.com/spf13/afero v1.15.0 // indirect
@@ -42,8 +47,9 @@ require (
 	go.yaml.in/yaml/v2 v2.4.2 // indirect
 	go.yaml.in/yaml/v3 v3.0.4 // indirect
 	golang.org/x/exp v0.0.0-20251023183803-a4bb9ffd2546 // indirect
-	golang.org/x/sys v0.37.0 // indirect
-	golang.org/x/text v0.28.0 // indirect
+	golang.org/x/sys v0.38.0 // indirect
+	golang.org/x/term v0.37.0 // indirect
+	golang.org/x/text v0.31.0 // indirect
 	google.golang.org/protobuf v1.36.8 // indirect
 	modernc.org/libc v1.67.6 // indirect
 	modernc.org/mathutil v1.7.1 // indirect

go.sum

@@ -12,6 +12,10 @@ github.com/frankban/quicktest v1.14.6 h1:7Xjx+VpznH+oBnejlPUj8oUpdxnVs4f8XU8WnHk
 github.com/frankban/quicktest v1.14.6/go.mod h1:4ptaffx2x8+WTWXmUCuVU6aPUX1/Mz7zb5vbUoiM6w0=
 github.com/fsnotify/fsnotify v1.9.0 h1:2Ml+OJNzbYCTzsxtv8vKSFD9PbJjmhYF14k/jKC7S9k=
 github.com/fsnotify/fsnotify v1.9.0/go.mod h1:8jBTzvmWwFyi3Pb8djgCCO5IBqzKJ/Jwo8TRcHyHii0=
+github.com/gdamore/encoding v1.0.1 h1:YzKZckdBL6jVt2Gc+5p82qhrGiqMdG/eNs6Wy0u3Uhw=
+github.com/gdamore/encoding v1.0.1/go.mod h1:0Z0cMFinngz9kS1QfMjCP8TY7em3bZYeeklsSDPivEo=
+github.com/gdamore/tcell/v2 v2.13.8 h1:Mys/Kl5wfC/GcC5Cx4C2BIQH9dbnhnkPgS9/wF3RlfU=
+github.com/gdamore/tcell/v2 v2.13.8/go.mod h1:+Wfe208WDdB7INEtCsNrAN6O2m+wsTPk1RAovjaILlo=
 github.com/getsentry/sentry-go v0.42.0 h1:eeFMACuZTbUQf90RE8dE4tXeSe4CZyfvR1MBL7RLEt8=
 github.com/getsentry/sentry-go v0.42.0/go.mod h1:eRXCoh3uvmjQLY6qu63BjUZnaBu5L5WhMV1RwYO8W5s=
 github.com/go-chi/chi v1.5.5 h1:vOB/HbEMt9QqBqErz07QehcOKHaWFtuj87tTDVz2qXE=
@@ -40,6 +44,8 @@ github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
 github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
 github.com/kylelemons/godebug v1.1.0 h1:RPNrshWIDI6G2gRW9EHilWtl7Z6Sb1BR0xunSBf0SNc=
 github.com/kylelemons/godebug v1.1.0/go.mod h1:9/0rRGxNHcop5bhtWyNeEfOS8JIWk580+fNqagV/RAw=
+github.com/lucasb-eyer/go-colorful v1.3.0 h1:2/yBRLdWBZKrf7gB40FoiKfAWYQ0lqNcbuQwVHXptag=
+github.com/lucasb-eyer/go-colorful v1.3.0/go.mod h1:R4dSotOR9KMtayYi1e77YzuveK+i7ruzyGqttikkLy0=
 github.com/mattn/go-isatty v0.0.20 h1:xfD0iDuEKnDkl03q4limB+vH+GxLEtL/jb4xVJSWWEY=
 github.com/mattn/go-isatty v0.0.20/go.mod h1:W+V8PltTTMOvKvAeJH7IuucS94S2C6jfK/D7dTCTo3Y=
 github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 h1:C3w9PqII01/Oq1c1nUAm88MOHcQC9l5mIlSMApZMrHA=
@@ -64,6 +70,10 @@ github.com/prometheus/procfs v0.16.1 h1:hZ15bTNuirocR6u0JZ6BAHHmwS1p8B4P6MRqxtzM
 github.com/prometheus/procfs v0.16.1/go.mod h1:teAbpZRB1iIAJYREa1LsoWUXykVXA1KlTmWl8x/U+Is=
 github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec h1:W09IVJc94icq4NjY3clb7Lk8O1qJ8BdBEF8z0ibU0rE=
 github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec/go.mod h1:qqbHyh8v60DhA7CoWK5oRCqLrMHRGoxYCSS9EjAz6Eo=
+github.com/rivo/tview v0.42.0 h1:b/ftp+RxtDsHSaynXTbJb+/n/BxDEi+W3UfF5jILK6c=
+github.com/rivo/tview v0.42.0/go.mod h1:cSfIYfhpSGCjp3r/ECJb+GKS7cGJnqV8vfjQPwoXyfY=
+github.com/rivo/uniseg v0.4.7 h1:WUdvkW8uEhrYfLC4ZzdpI2ztxP1I582+49Oc5Mq64VQ=
+github.com/rivo/uniseg v0.4.7/go.mod h1:FN3SvrM+Zdj16jyLfmOkMNblXMcoc8DfTHruCPUcx88=
 github.com/rogpeppe/go-internal v1.10.0 h1:TMyTOH3F/DB16zRVcYyreMH6GnZZrwQVAoYjRBZyWFQ=
 github.com/rogpeppe/go-internal v1.10.0/go.mod h1:UQnix2H7Ngw/k4C5ijL5+65zddjncjaFoBhdsK/akog=
 github.com/sagikazarmark/locafero v0.11.0 h1:1iurJgmM9G3PA/I+wWYIOw/5SyBtxapeHDcg+AAIFXc=
@@ -86,6 +96,7 @@ github.com/stretchr/testify v1.11.1 h1:7s2iGBzp5EwR7/aIZr8ao5+dra3wiQyKjjFuvgVKu
 github.com/stretchr/testify v1.11.1/go.mod h1:wZwfW3scLgRK+23gO65QZefKpKQRnfz6sD981Nm4B6U=
 github.com/subosito/gotenv v1.6.0 h1:9NlTDc1FTs4qu0DDq7AEtTPNw6SVm7uBMsUCUjABIf8=
 github.com/subosito/gotenv v1.6.0/go.mod h1:Dk4QP5c2W3ibzajGcXpNraDfq2IrhjMIvMSWPKKo0FU=
+github.com/yuin/goldmark v1.4.13/go.mod h1:6yULJ656Px+3vBD8DxQVa3kxgyrAnzto9xy5taEt/CY=
 go.uber.org/dig v1.19.0 h1:BACLhebsYdpQ7IROQ1AGPjrXcP5dF80U3gKoFzbaq/4=
 go.uber.org/dig v1.19.0/go.mod h1:Us0rSJiThwCv2GteUN0Q7OKvU7n5J4dxZ9JKUXozFdE=
 go.uber.org/fx v1.24.0 h1:wE8mruvpg2kiiL1Vqd0CC+tr0/24XIB10Iwp2lLWzkg=
@@ -100,19 +111,55 @@ go.yaml.in/yaml/v2 v2.4.2 h1:DzmwEr2rDGHl7lsFgAHxmNz/1NlQ7xLIrlN2h5d1eGI=
 go.yaml.in/yaml/v2 v2.4.2/go.mod h1:081UH+NErpNdqlCXm3TtEran0rJZGxAYx9hb/ELlsPU=
 go.yaml.in/yaml/v3 v3.0.4 h1:tfq32ie2Jv2UxXFdLJdh3jXuOzWiL1fo0bu/FbuKpbc=
 go.yaml.in/yaml/v3 v3.0.4/go.mod h1:DhzuOOF2ATzADvBadXxruRBLzYTpT36CKvDb3+aBEFg=
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/crypto v0.0.0-20210921155107-089bfa567519/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
 golang.org/x/exp v0.0.0-20251023183803-a4bb9ffd2546 h1:mgKeJMpvi0yx/sU5GsxQ7p6s2wtOnGAHZWCHUM4KGzY=
 golang.org/x/exp v0.0.0-20251023183803-a4bb9ffd2546/go.mod h1:j/pmGrbnkbPtQfxEe5D0VQhZC6qKbfKifgD0oM7sR70=
+golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4/go.mod h1:jJ57K6gSWd91VN4djpZkiMVwK6gcyfeH4XE8wZrZaV4=
+golang.org/x/mod v0.8.0/go.mod h1:iBbtSCu2XBx23ZKBPSOrRkjjQPZFPuis4dIYUhu/chs=
 golang.org/x/mod v0.29.0 h1:HV8lRxZC4l2cr3Zq1LvtOsi/ThTgWnUk/y64QSs8GwA=
 golang.org/x/mod v0.29.0/go.mod h1:NyhrlYXJ2H4eJiRy/WDBO6HMqZQ6q9nk4JzS3NuCK+w=
+golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
+golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
+golang.org/x/net v0.0.0-20220722155237-a158d28d115b/go.mod h1:XRhObCWvk6IyKnWLug+ECip1KBveYUHfp+8e9klMJ9c=
+golang.org/x/net v0.6.0/go.mod h1:2Tu9+aMcznHK/AK1HMvgo6xiTLG5rD5rZLDS+rp2Bjs=
+golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.0.0-20220722155255-886fb9371eb4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.1.0/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.17.0 h1:l60nONMj9l5drqw6jlhIELNv9I0A4OFgRsG9k2oT9Ug=
 golang.org/x/sync v0.17.0/go.mod h1:9KTHXmSnoGruLpwFjVSX0lNNA75CykiMECbovNTZqGI=
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.5.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.37.0 h1:fdNQudmxPjkdUTPnLn5mdQv7Zwvbvpaxqs831goi9kQ=
 golang.org/x/sys v0.37.0/go.mod h1:OgkHotnGiDImocRcuBABYBEXf8A9a87e/uXjp9XT3ks=
+golang.org/x/sys v0.38.0 h1:3yZWxaJjBmCWXqhN1qh02AkOnCQ1poK6oF+a7xWL6Gc=
+golang.org/x/sys v0.38.0/go.mod h1:OgkHotnGiDImocRcuBABYBEXf8A9a87e/uXjp9XT3ks=
+golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
+golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
+golang.org/x/term v0.5.0/go.mod h1:jMB1sMXY+tzblOD4FWmEbocvup2/aLOaQEp7JmGp78k=
+golang.org/x/term v0.37.0 h1:8EGAD0qCmHYZg6J17DvsMy9/wJ7/D/4pV/wfnld5lTU=
+golang.org/x/term v0.37.0/go.mod h1:5pB4lxRNYYVZuTLmy8oR2BH8dflOR+IbTYFD8fi3254=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
+golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
+golang.org/x/text v0.7.0/go.mod h1:mrYo+phRRbMaCq/xk9113O4dZlRixOauAjOtrjsXDZ8=
+golang.org/x/text v0.14.0/go.mod h1:18ZOQIKpY8NJVqYksKHtTdi31H5itFRjB5/qKTNYzSU=
 golang.org/x/text v0.28.0 h1:rhazDwis8INMIwQ4tpjLDzUhx6RlXqZNPEM0huQojng=
 golang.org/x/text v0.28.0/go.mod h1:U8nCwOR8jO/marOQ0QbDiOngZVEBB7MAiitBuMjXiNU=
+golang.org/x/text v0.31.0 h1:aC8ghyu4JhP8VojJ2lEHBnochRno1sgL6nEi9WGFGMM=
+golang.org/x/text v0.31.0/go.mod h1:tKRAlv61yKIjGGHX/4tP1LTbc13YSec1pxVEWXzfoeM=
+golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
+golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
+golang.org/x/tools v0.1.12/go.mod h1:hNGJHUnrk76NpqgfD5Aqm5Crs+Hm0VOH/i9J2+nxYbc=
+golang.org/x/tools v0.6.0/go.mod h1:Xwgl3UAJ/d3gWutnCtw505GrjyAbvKui8lOU390QaIU=
 golang.org/x/tools v0.38.0 h1:Hx2Xv8hISq8Lm16jvBZ2VQf+RLmbd7wVUsALibYI/IQ=
 golang.org/x/tools v0.38.0/go.mod h1:yEsQ/d/YK8cjh0L6rZlY8tgtlKiBNTL14pGDJPJpYQs=
+golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 google.golang.org/protobuf v1.36.8 h1:xHScyCOEuuwZEc6UtSOvPbAT4zRh0xcNRYekJwfqyMc=
 google.golang.org/protobuf v1.36.8/go.mod h1:fuxRtAxBytpl4zzqUh6/eyUujkJdNiuEkXntxiD/uRU=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=

internal/broker/broker.go

@@ -0,0 +1,73 @@
+// Package broker provides an in-memory pub/sub for long-poll notifications.
+package broker
+
+import (
+	"sync"
+)
+
+// Broker notifies waiting clients when new messages are available.
+type Broker struct {
+	mu        sync.Mutex
+	listeners map[int64][]chan struct{}
+}
+
+// New creates a new Broker.
+func New() *Broker {
+	return &Broker{ //nolint:exhaustruct // mu has zero-value default
+		listeners: make(map[int64][]chan struct{}),
+	}
+}
+
+// Wait returns a channel that will be closed when a message
+// is available for the user.
+func (b *Broker) Wait(userID int64) chan struct{} {
+	waitCh := make(chan struct{}, 1)
+
+	b.mu.Lock()
+	b.listeners[userID] = append(
+		b.listeners[userID], waitCh,
+	)
+	b.mu.Unlock()
+
+	return waitCh
+}
+
+// Notify wakes up all waiting clients for a user.
+func (b *Broker) Notify(userID int64) {
+	b.mu.Lock()
+	waiters := b.listeners[userID]
+	delete(b.listeners, userID)
+	b.mu.Unlock()
+
+	for _, waiter := range waiters {
+		select {
+		case waiter <- struct{}{}:
+		default:
+		}
+	}
+}
+
+// Remove removes a specific wait channel (for cleanup on timeout).
+func (b *Broker) Remove(
+	userID int64,
+	waitCh chan struct{},
+) {
+	b.mu.Lock()
+	defer b.mu.Unlock()
+
+	waiters := b.listeners[userID]
+
+	for i, waiter := range waiters {
+		if waiter == waitCh {
+			b.listeners[userID] = append(
+				waiters[:i], waiters[i+1:]...,
+			)
+
+			break
+		}
+	}
+
+	if len(b.listeners[userID]) == 0 {
+		delete(b.listeners, userID)
+	}
+}

internal/broker/broker_test.go

@@ -0,0 +1,121 @@
+package broker_test
+
+import (
+	"sync"
+	"testing"
+	"time"
+
+	"git.eeqj.de/sneak/chat/internal/broker"
+)
+
+func TestNewBroker(t *testing.T) {
+	t.Parallel()
+
+	brk := broker.New()
+	if brk == nil {
+		t.Fatal("expected non-nil broker")
+	}
+}
+
+func TestWaitAndNotify(t *testing.T) {
+	t.Parallel()
+
+	brk := broker.New()
+	waitCh := brk.Wait(1)
+
+	go func() {
+		time.Sleep(10 * time.Millisecond)
+		brk.Notify(1)
+	}()
+
+	select {
+	case <-waitCh:
+	case <-time.After(2 * time.Second):
+		t.Fatal("timeout")
+	}
+}
+
+func TestNotifyWithoutWaiters(t *testing.T) {
+	t.Parallel()
+
+	brk := broker.New()
+	brk.Notify(42) // should not panic.
+}
+
+func TestRemove(t *testing.T) {
+	t.Parallel()
+
+	brk := broker.New()
+	waitCh := brk.Wait(1)
+
+	brk.Remove(1, waitCh)
+
+	brk.Notify(1)
+
+	select {
+	case <-waitCh:
+		t.Fatal("should not receive after remove")
+	case <-time.After(50 * time.Millisecond):
+	}
+}
+
+func TestMultipleWaiters(t *testing.T) {
+	t.Parallel()
+
+	brk := broker.New()
+	waitCh1 := brk.Wait(1)
+	waitCh2 := brk.Wait(1)
+
+	brk.Notify(1)
+
+	select {
+	case <-waitCh1:
+	case <-time.After(time.Second):
+		t.Fatal("ch1 timeout")
+	}
+
+	select {
+	case <-waitCh2:
+	case <-time.After(time.Second):
+		t.Fatal("ch2 timeout")
+	}
+}
+
+func TestConcurrentWaitNotify(t *testing.T) {
+	t.Parallel()
+
+	brk := broker.New()
+
+	var waitGroup sync.WaitGroup
+
+	const concurrency = 100
+
+	for idx := range concurrency {
+		waitGroup.Add(1)
+
+		go func(uid int64) {
+			defer waitGroup.Done()
+
+			waitCh := brk.Wait(uid)
+
+			brk.Notify(uid)
+
+			select {
+			case <-waitCh:
+			case <-time.After(time.Second):
+				t.Error("timeout")
+			}
+		}(int64(idx % 10))
+	}
+
+	waitGroup.Wait()
+}
+
+func TestRemoveNonexistent(t *testing.T) {
+	t.Parallel()
+
+	brk := broker.New()
+	waitCh := make(chan struct{}, 1)
+
+	brk.Remove(999, waitCh) // should not panic.
+}

internal/config/config.go

@@ -41,7 +41,9 @@ type Config struct {
 }
 
 // New creates a new Config by reading from files and environment variables.
-func New(_ fx.Lifecycle, params Params) (*Config, error) {
+func New(
+	_ fx.Lifecycle, params Params,
+) (*Config, error) {
 	log := params.Logger.Get()
 	name := params.Globals.Appname
 
@@ -74,7 +76,7 @@ func New(_ fx.Lifecycle, params Params) (*Config, error) {
 		}
 	}
 
-	s := &Config{
+	cfg := &Config{
 		DBURL:           viper.GetString("DBURL"),
 		Debug:           viper.GetBool("DEBUG"),
 		Port:            viper.GetInt("PORT"),
@@ -92,10 +94,10 @@ func New(_ fx.Lifecycle, params Params) (*Config, error) {
 		params:          &params,
 	}
 
-	if s.Debug {
+	if cfg.Debug {
 		params.Logger.EnableDebugLogging()
-		s.log = params.Logger.Get()
+		cfg.log = params.Logger.Get()
 	}
 
-	return s, nil
+	return cfg, nil
 }

internal/db/db.go

@@ -11,20 +11,16 @@ import (
 	"sort"
 	"strconv"
 	"strings"
-	"time"
 
 	"git.eeqj.de/sneak/chat/internal/config"
 	"git.eeqj.de/sneak/chat/internal/logger"
-	"git.eeqj.de/sneak/chat/internal/models"
 	"go.uber.org/fx"
 
-	_ "github.com/joho/godotenv/autoload" // loads .env file
-	_ "modernc.org/sqlite"                // SQLite driver
+	_ "github.com/joho/godotenv/autoload" // .env
+	_ "modernc.org/sqlite"                // driver
 )
 
-const (
-	minMigrationParts = 2
-)
+const minMigrationParts = 2
 
 // SchemaFiles contains embedded SQL migration files.
 //
@@ -39,87 +35,95 @@ type Params struct {
 	Config *config.Config
 }
 
-// Database manages the SQLite database connection and migrations.
+// Database manages the SQLite connection and migrations.
 type Database struct {
-	db     *sql.DB
+	conn   *sql.DB
 	log    *slog.Logger
 	params *Params
 }
 
-// GetDB returns the underlying sql.DB connection.
-func (s *Database) GetDB() *sql.DB {
-	return s.db
-}
-
-// NewChannel creates a Channel model instance with the db reference injected.
-func (s *Database) NewChannel(id int64, name, topic, modes string, createdAt, updatedAt time.Time) *models.Channel {
-	c := &models.Channel{
-		ID:        id,
-		Name:      name,
-		Topic:     topic,
-		Modes:     modes,
-		CreatedAt: createdAt,
-		UpdatedAt: updatedAt,
+// New creates a new Database and registers lifecycle hooks.
+func New(
+	lifecycle fx.Lifecycle,
+	params Params,
+) (*Database, error) {
+	database := &Database{ //nolint:exhaustruct // conn set in OnStart
+		params: &params,
+		log:    params.Logger.Get(),
 	}
-	c.SetDB(s)
 
-	return c
-}
+	database.log.Info("Database instantiated")
 
-// New creates a new Database instance and registers lifecycle hooks.
-func New(lc fx.Lifecycle, params Params) (*Database, error) {
-	s := new(Database)
-	s.params = &params
-	s.log = params.Logger.Get()
-
-	s.log.Info("Database instantiated")
-
-	lc.Append(fx.Hook{
+	lifecycle.Append(fx.Hook{
 		OnStart: func(ctx context.Context) error {
-			s.log.Info("Database OnStart Hook")
+			database.log.Info("Database OnStart Hook")
 
-			return s.connect(ctx)
+			return database.connect(ctx)
 		},
 		OnStop: func(_ context.Context) error {
-			s.log.Info("Database OnStop Hook")
+			database.log.Info("Database OnStop Hook")
 
-			if s.db != nil {
-				return s.db.Close()
+			if database.conn != nil {
+				closeErr := database.conn.Close()
+				if closeErr != nil {
+					return fmt.Errorf(
+						"close db: %w", closeErr,
+					)
+				}
 			}
 
 			return nil
 		},
 	})
 
-	return s, nil
+	return database, nil
 }
 
-func (s *Database) connect(ctx context.Context) error {
-	dbURL := s.params.Config.DBURL
+// GetDB returns the underlying sql.DB connection.
+func (database *Database) GetDB() *sql.DB {
+	return database.conn
+}
+
+func (database *Database) connect(ctx context.Context) error {
+	dbURL := database.params.Config.DBURL
 	if dbURL == "" {
-		dbURL = "file:./data.db?_journal_mode=WAL"
+		dbURL = "file:./data.db?_journal_mode=WAL&_busy_timeout=5000"
 	}
 
-	s.log.Info("connecting to database", "url", dbURL)
+	database.log.Info(
+		"connecting to database", "url", dbURL,
+	)
 
-	d, err := sql.Open("sqlite", dbURL)
+	conn, err := sql.Open("sqlite", dbURL)
 	if err != nil {
-		s.log.Error("failed to open database", "error", err)
-
-		return err
+		return fmt.Errorf("open database: %w", err)
 	}
 
-	err = d.PingContext(ctx)
+	err = conn.PingContext(ctx)
 	if err != nil {
-		s.log.Error("failed to ping database", "error", err)
-
-		return err
+		return fmt.Errorf("ping database: %w", err)
 	}
 
-	s.db = d
-	s.log.Info("database connected")
+	conn.SetMaxOpenConns(1)
 
-	return s.runMigrations(ctx)
+	database.conn = conn
+	database.log.Info("database connected")
+
+	_, err = database.conn.ExecContext(
+		ctx, "PRAGMA foreign_keys = ON",
+	)
+	if err != nil {
+		return fmt.Errorf("enable foreign keys: %w", err)
+	}
+
+	_, err = database.conn.ExecContext(
+		ctx, "PRAGMA busy_timeout = 5000",
+	)
+	if err != nil {
+		return fmt.Errorf("set busy timeout: %w", err)
+	}
+
+	return database.runMigrations(ctx)
 }
 
 type migration struct {
@@ -128,65 +132,152 @@ type migration struct {
 	sql     string
 }
 
-func (s *Database) runMigrations(ctx context.Context) error {
-	err := s.bootstrapMigrationsTable(ctx)
-	if err != nil {
-		return err
-	}
-
-	migrations, err := s.loadMigrations()
-	if err != nil {
-		return err
-	}
-
-	err = s.applyMigrations(ctx, migrations)
-	if err != nil {
-		return err
-	}
-
-	s.log.Info("database migrations complete")
-
-	return nil
-}
-
-func (s *Database) bootstrapMigrationsTable(ctx context.Context) error {
-	_, err := s.db.ExecContext(ctx, `CREATE TABLE IF NOT EXISTS schema_migrations (
+func (database *Database) runMigrations(
+	ctx context.Context,
+) error {
+	_, err := database.conn.ExecContext(ctx,
+		`CREATE TABLE IF NOT EXISTS schema_migrations (
 		 version INTEGER PRIMARY KEY,
-		applied_at DATETIME DEFAULT CURRENT_TIMESTAMP
-	)`)
+		 applied_at DATETIME DEFAULT CURRENT_TIMESTAMP)`)
 	if err != nil {
-		return fmt.Errorf("failed to create schema_migrations table: %w", err)
+		return fmt.Errorf(
+			"create schema_migrations: %w", err,
+		)
+	}
+
+	migrations, err := database.loadMigrations()
+	if err != nil {
+		return err
+	}
+
+	for _, mig := range migrations {
+		err = database.applyMigration(ctx, mig)
+		if err != nil {
+			return err
+		}
+	}
+
+	database.log.Info("database migrations complete")
+
+	return nil
+}
+
+func (database *Database) applyMigration(
+	ctx context.Context,
+	mig migration,
+) error {
+	var exists int
+
+	err := database.conn.QueryRowContext(ctx,
+		`SELECT COUNT(*) FROM schema_migrations
+		 WHERE version = ?`,
+		mig.version,
+	).Scan(&exists)
+	if err != nil {
+		return fmt.Errorf(
+			"check migration %d: %w", mig.version, err,
+		)
+	}
+
+	if exists > 0 {
+		return nil
+	}
+
+	database.log.Info(
+		"applying migration",
+		"version", mig.version,
+		"name", mig.name,
+	)
+
+	return database.execMigration(ctx, mig)
+}
+
+func (database *Database) execMigration(
+	ctx context.Context,
+	mig migration,
+) error {
+	transaction, err := database.conn.BeginTx(ctx, nil)
+	if err != nil {
+		return fmt.Errorf(
+			"begin tx for migration %d: %w",
+			mig.version, err,
+		)
+	}
+
+	_, err = transaction.ExecContext(ctx, mig.sql)
+	if err != nil {
+		_ = transaction.Rollback()
+
+		return fmt.Errorf(
+			"apply migration %d (%s): %w",
+			mig.version, mig.name, err,
+		)
+	}
+
+	_, err = transaction.ExecContext(ctx,
+		`INSERT INTO schema_migrations (version)
+		 VALUES (?)`,
+		mig.version,
+	)
+	if err != nil {
+		_ = transaction.Rollback()
+
+		return fmt.Errorf(
+			"record migration %d: %w",
+			mig.version, err,
+		)
+	}
+
+	err = transaction.Commit()
+	if err != nil {
+		return fmt.Errorf(
+			"commit migration %d: %w",
+			mig.version, err,
+		)
 	}
 
 	return nil
 }
 
-func (s *Database) loadMigrations() ([]migration, error) {
+func (database *Database) loadMigrations() (
+	[]migration,
+	error,
+) {
 	entries, err := fs.ReadDir(SchemaFiles, "schema")
 	if err != nil {
-		return nil, fmt.Errorf("failed to read schema dir: %w", err)
+		return nil, fmt.Errorf(
+			"read schema dir: %w", err,
+		)
 	}
 
-	var migrations []migration
+	migrations := make([]migration, 0, len(entries))
 
 	for _, entry := range entries {
-		if entry.IsDir() || !strings.HasSuffix(entry.Name(), ".sql") {
+		if entry.IsDir() ||
+			!strings.HasSuffix(entry.Name(), ".sql") {
 			continue
 		}
 
-		parts := strings.SplitN(entry.Name(), "_", minMigrationParts)
+		parts := strings.SplitN(
+			entry.Name(), "_", minMigrationParts,
+		)
 		if len(parts) < minMigrationParts {
 			continue
 		}
 
-		version, err := strconv.Atoi(parts[0])
-		if err != nil {
+		version, parseErr := strconv.Atoi(parts[0])
+		if parseErr != nil {
 			continue
 		}
 
-		content, err := SchemaFiles.ReadFile("schema/" + entry.Name())
-		if err != nil {
-			return nil, fmt.Errorf("failed to read migration %s: %w", entry.Name(), err)
+		content, readErr := SchemaFiles.ReadFile(
+			"schema/" + entry.Name(),
+		)
+		if readErr != nil {
+			return nil, fmt.Errorf(
+				"read migration %s: %w",
+				entry.Name(), readErr,
+			)
 		}
 
 		migrations = append(migrations, migration{
@@ -202,32 +293,3 @@ func (s *Database) loadMigrations() ([]migration, error) {
 
 	return migrations, nil
 }
-
-func (s *Database) applyMigrations(ctx context.Context, migrations []migration) error {
-	for _, m := range migrations {
-		var exists int
-
-		err := s.db.QueryRowContext(ctx, "SELECT COUNT(*) FROM schema_migrations WHERE version = ?", m.version).Scan(&exists)
-		if err != nil {
-			return fmt.Errorf("failed to check migration %d: %w", m.version, err)
-		}
-
-		if exists > 0 {
-			continue
-		}
-
-		s.log.Info("applying migration", "version", m.version, "name", m.name)
-
-		_, err = s.db.ExecContext(ctx, m.sql)
-		if err != nil {
-			return fmt.Errorf("failed to apply migration %d (%s): %w", m.version, m.name, err)
-		}
-
-		_, err = s.db.ExecContext(ctx, "INSERT INTO schema_migrations (version) VALUES (?)", m.version)
-		if err != nil {
-			return fmt.Errorf("failed to record migration %d: %w", m.version, err)
-		}
-	}
-
-	return nil
-}

internal/db/export_test.go

@@ -0,0 +1,60 @@
+package db
+
+import (
+	"context"
+	"database/sql"
+	"fmt"
+	"log/slog"
+	"sync/atomic"
+)
+
+//nolint:gochecknoglobals // test counter
+var testDBCounter atomic.Int64
+
+// NewTestDatabase creates an in-memory database for testing.
+func NewTestDatabase() (*Database, error) {
+	counter := testDBCounter.Add(1)
+
+	dsn := fmt.Sprintf(
+		"file:testdb%d?mode=memory"+
+			"&cache=shared&_pragma=foreign_keys(1)",
+		counter,
+	)
+
+	conn, err := sql.Open("sqlite", dsn)
+	if err != nil {
+		return nil, fmt.Errorf("open test db: %w", err)
+	}
+
+	database := &Database{ //nolint:exhaustruct // test helper, params not needed
+		conn: conn,
+		log:  slog.Default(),
+	}
+
+	err = database.runMigrations(context.Background())
+	if err != nil {
+		closeErr := conn.Close()
+		if closeErr != nil {
+			return nil, fmt.Errorf(
+				"close after migration failure: %w",
+				closeErr,
+			)
+		}
+
+		return nil, fmt.Errorf(
+			"run test migrations: %w", err,
+		)
+	}
+
+	return database, nil
+}
+
+// Close closes the underlying database connection.
+func (database *Database) Close() error {
+	err := database.conn.Close()
+	if err != nil {
+		return fmt.Errorf("close database: %w", err)
+	}
+
+	return nil
+}

internal/db/queries.go

@@ -0,0 +1,720 @@
+package db
+
+import (
+	"context"
+	"crypto/rand"
+	"database/sql"
+	"encoding/hex"
+	"encoding/json"
+	"fmt"
+	"time"
+
+	"github.com/google/uuid"
+)
+
+const (
+	tokenBytes       = 32
+	defaultPollLimit = 100
+	defaultHistLimit = 50
+)
+
+func generateToken() (string, error) {
+	buf := make([]byte, tokenBytes)
+
+	_, err := rand.Read(buf)
+	if err != nil {
+		return "", fmt.Errorf("generate token: %w", err)
+	}
+
+	return hex.EncodeToString(buf), nil
+}
+
+// IRCMessage is the IRC envelope for all messages.
+type IRCMessage struct {
+	ID      string          `json:"id"`
+	Command string          `json:"command"`
+	From    string          `json:"from,omitempty"`
+	To      string          `json:"to,omitempty"`
+	Body    json.RawMessage `json:"body,omitempty"`
+	TS      string          `json:"ts"`
+	Meta    json.RawMessage `json:"meta,omitempty"`
+	DBID    int64           `json:"-"`
+}
+
+// ChannelInfo is a lightweight channel representation.
+type ChannelInfo struct {
+	ID    int64  `json:"id"`
+	Name  string `json:"name"`
+	Topic string `json:"topic"`
+}
+
+// MemberInfo represents a channel member.
+type MemberInfo struct {
+	ID       int64     `json:"id"`
+	Nick     string    `json:"nick"`
+	LastSeen time.Time `json:"lastSeen"`
+}
+
+// CreateUser registers a new user with the given nick.
+func (database *Database) CreateUser(
+	ctx context.Context,
+	nick string,
+) (int64, string, error) {
+	token, err := generateToken()
+	if err != nil {
+		return 0, "", err
+	}
+
+	now := time.Now()
+
+	res, err := database.conn.ExecContext(ctx,
+		`INSERT INTO users
+		 (nick, token, created_at, last_seen)
+		 VALUES (?, ?, ?, ?)`,
+		nick, token, now, now)
+	if err != nil {
+		return 0, "", fmt.Errorf("create user: %w", err)
+	}
+
+	userID, _ := res.LastInsertId()
+
+	return userID, token, nil
+}
+
+// GetUserByToken returns user id and nick for a token.
+func (database *Database) GetUserByToken(
+	ctx context.Context,
+	token string,
+) (int64, string, error) {
+	var userID int64
+
+	var nick string
+
+	err := database.conn.QueryRowContext(
+		ctx,
+		"SELECT id, nick FROM users WHERE token = ?",
+		token,
+	).Scan(&userID, &nick)
+	if err != nil {
+		return 0, "", fmt.Errorf("get user by token: %w", err)
+	}
+
+	_, _ = database.conn.ExecContext(
+		ctx,
+		"UPDATE users SET last_seen = ? WHERE id = ?",
+		time.Now(), userID,
+	)
+
+	return userID, nick, nil
+}
+
+// GetUserByNick returns user id for a given nick.
+func (database *Database) GetUserByNick(
+	ctx context.Context,
+	nick string,
+) (int64, error) {
+	var userID int64
+
+	err := database.conn.QueryRowContext(
+		ctx,
+		"SELECT id FROM users WHERE nick = ?",
+		nick,
+	).Scan(&userID)
+	if err != nil {
+		return 0, fmt.Errorf("get user by nick: %w", err)
+	}
+
+	return userID, nil
+}
+
+// GetChannelByName returns the channel ID for a name.
+func (database *Database) GetChannelByName(
+	ctx context.Context,
+	name string,
+) (int64, error) {
+	var channelID int64
+
+	err := database.conn.QueryRowContext(
+		ctx,
+		"SELECT id FROM channels WHERE name = ?",
+		name,
+	).Scan(&channelID)
+	if err != nil {
+		return 0, fmt.Errorf(
+			"get channel by name: %w", err,
+		)
+	}
+
+	return channelID, nil
+}
+
+// GetOrCreateChannel returns channel id, creating if needed.
+// Uses INSERT OR IGNORE to avoid TOCTOU races.
+func (database *Database) GetOrCreateChannel(
+	ctx context.Context,
+	name string,
+) (int64, error) {
+	now := time.Now()
+
+	_, err := database.conn.ExecContext(ctx,
+		`INSERT OR IGNORE INTO channels
+		 (name, created_at, updated_at)
+		 VALUES (?, ?, ?)`,
+		name, now, now)
+	if err != nil {
+		return 0, fmt.Errorf("create channel: %w", err)
+	}
+
+	var channelID int64
+
+	err = database.conn.QueryRowContext(
+		ctx,
+		"SELECT id FROM channels WHERE name = ?",
+		name,
+	).Scan(&channelID)
+	if err != nil {
+		return 0, fmt.Errorf("get channel: %w", err)
+	}
+
+	return channelID, nil
+}
+
+// JoinChannel adds a user to a channel.
+func (database *Database) JoinChannel(
+	ctx context.Context,
+	channelID, userID int64,
+) error {
+	_, err := database.conn.ExecContext(ctx,
+		`INSERT OR IGNORE INTO channel_members
+		 (channel_id, user_id, joined_at)
+		 VALUES (?, ?, ?)`,
+		channelID, userID, time.Now())
+	if err != nil {
+		return fmt.Errorf("join channel: %w", err)
+	}
+
+	return nil
+}
+
+// PartChannel removes a user from a channel.
+func (database *Database) PartChannel(
+	ctx context.Context,
+	channelID, userID int64,
+) error {
+	_, err := database.conn.ExecContext(ctx,
+		`DELETE FROM channel_members
+		 WHERE channel_id = ? AND user_id = ?`,
+		channelID, userID)
+	if err != nil {
+		return fmt.Errorf("part channel: %w", err)
+	}
+
+	return nil
+}
+
+// DeleteChannelIfEmpty removes a channel with no members.
+func (database *Database) DeleteChannelIfEmpty(
+	ctx context.Context,
+	channelID int64,
+) error {
+	_, err := database.conn.ExecContext(ctx,
+		`DELETE FROM channels WHERE id = ?
+		 AND NOT EXISTS
+		 (SELECT 1 FROM channel_members
+		  WHERE channel_id = ?)`,
+		channelID, channelID)
+	if err != nil {
+		return fmt.Errorf(
+			"delete channel if empty: %w", err,
+		)
+	}
+
+	return nil
+}
+
+// scanChannels scans rows into a ChannelInfo slice.
+func scanChannels(
+	rows *sql.Rows,
+) ([]ChannelInfo, error) {
+	defer func() { _ = rows.Close() }()
+
+	var out []ChannelInfo
+
+	for rows.Next() {
+		var chanInfo ChannelInfo
+
+		err := rows.Scan(
+			&chanInfo.ID, &chanInfo.Name, &chanInfo.Topic,
+		)
+		if err != nil {
+			return nil, fmt.Errorf("scan channel: %w", err)
+		}
+
+		out = append(out, chanInfo)
+	}
+
+	err := rows.Err()
+	if err != nil {
+		return nil, fmt.Errorf("rows error: %w", err)
+	}
+
+	if out == nil {
+		out = []ChannelInfo{}
+	}
+
+	return out, nil
+}
+
+// ListChannels returns channels the user has joined.
+func (database *Database) ListChannels(
+	ctx context.Context,
+	userID int64,
+) ([]ChannelInfo, error) {
+	rows, err := database.conn.QueryContext(ctx,
+		`SELECT c.id, c.name, c.topic
+		 FROM channels c
+		 INNER JOIN channel_members cm
+		   ON cm.channel_id = c.id
+		 WHERE cm.user_id = ?
+		 ORDER BY c.name`, userID)
+	if err != nil {
+		return nil, fmt.Errorf("list channels: %w", err)
+	}
+
+	return scanChannels(rows)
+}
+
+// ListAllChannels returns every channel.
+func (database *Database) ListAllChannels(
+	ctx context.Context,
+) ([]ChannelInfo, error) {
+	rows, err := database.conn.QueryContext(ctx,
+		`SELECT id, name, topic
+		 FROM channels ORDER BY name`)
+	if err != nil {
+		return nil, fmt.Errorf(
+			"list all channels: %w", err,
+		)
+	}
+
+	return scanChannels(rows)
+}
+
+// ChannelMembers returns all members of a channel.
+func (database *Database) ChannelMembers(
+	ctx context.Context,
+	channelID int64,
+) ([]MemberInfo, error) {
+	rows, err := database.conn.QueryContext(ctx,
+		`SELECT u.id, u.nick, u.last_seen
+		 FROM users u
+		 INNER JOIN channel_members cm
+		   ON cm.user_id = u.id
+		 WHERE cm.channel_id = ?
+		 ORDER BY u.nick`, channelID)
+	if err != nil {
+		return nil, fmt.Errorf(
+			"query channel members: %w", err,
+		)
+	}
+
+	defer func() { _ = rows.Close() }()
+
+	var members []MemberInfo
+
+	for rows.Next() {
+		var member MemberInfo
+
+		err = rows.Scan(
+			&member.ID, &member.Nick, &member.LastSeen,
+		)
+		if err != nil {
+			return nil, fmt.Errorf(
+				"scan member: %w", err,
+			)
+		}
+
+		members = append(members, member)
+	}
+
+	err = rows.Err()
+	if err != nil {
+		return nil, fmt.Errorf("rows error: %w", err)
+	}
+
+	if members == nil {
+		members = []MemberInfo{}
+	}
+
+	return members, nil
+}
+
+// IsChannelMember checks if a user belongs to a channel.
+func (database *Database) IsChannelMember(
+	ctx context.Context,
+	channelID, userID int64,
+) (bool, error) {
+	var count int
+
+	err := database.conn.QueryRowContext(ctx,
+		`SELECT COUNT(*) FROM channel_members
+		 WHERE channel_id = ? AND user_id = ?`,
+		channelID, userID,
+	).Scan(&count)
+	if err != nil {
+		return false, fmt.Errorf(
+			"check membership: %w", err,
+		)
+	}
+
+	return count > 0, nil
+}
+
+// scanInt64s scans rows into an int64 slice.
+func scanInt64s(rows *sql.Rows) ([]int64, error) {
+	defer func() { _ = rows.Close() }()
+
+	var ids []int64
+
+	for rows.Next() {
+		var val int64
+
+		err := rows.Scan(&val)
+		if err != nil {
+			return nil, fmt.Errorf(
+				"scan int64: %w", err,
+			)
+		}
+
+		ids = append(ids, val)
+	}
+
+	err := rows.Err()
+	if err != nil {
+		return nil, fmt.Errorf("rows error: %w", err)
+	}
+
+	return ids, nil
+}
+
+// GetChannelMemberIDs returns user IDs in a channel.
+func (database *Database) GetChannelMemberIDs(
+	ctx context.Context,
+	channelID int64,
+) ([]int64, error) {
+	rows, err := database.conn.QueryContext(ctx,
+		`SELECT user_id FROM channel_members
+		 WHERE channel_id = ?`, channelID)
+	if err != nil {
+		return nil, fmt.Errorf(
+			"get channel member ids: %w", err,
+		)
+	}
+
+	return scanInt64s(rows)
+}
+
+// GetUserChannelIDs returns channel IDs the user is in.
+func (database *Database) GetUserChannelIDs(
+	ctx context.Context,
+	userID int64,
+) ([]int64, error) {
+	rows, err := database.conn.QueryContext(ctx,
+		`SELECT channel_id FROM channel_members
+		 WHERE user_id = ?`, userID)
+	if err != nil {
+		return nil, fmt.Errorf(
+			"get user channel ids: %w", err,
+		)
+	}
+
+	return scanInt64s(rows)
+}
+
+// InsertMessage stores a message and returns its DB ID.
+func (database *Database) InsertMessage(
+	ctx context.Context,
+	command, from, target string,
+	body json.RawMessage,
+	meta json.RawMessage,
+) (int64, string, error) {
+	msgUUID := uuid.New().String()
+	now := time.Now().UTC()
+
+	if body == nil {
+		body = json.RawMessage("[]")
+	}
+
+	if meta == nil {
+		meta = json.RawMessage("{}")
+	}
+
+	res, err := database.conn.ExecContext(ctx,
+		`INSERT INTO messages
+		 (uuid, command, msg_from, msg_to,
+		  body, meta, created_at)
+		 VALUES (?, ?, ?, ?, ?, ?, ?)`,
+		msgUUID, command, from, target,
+		string(body), string(meta), now)
+	if err != nil {
+		return 0, "", fmt.Errorf(
+			"insert message: %w", err,
+		)
+	}
+
+	dbID, _ := res.LastInsertId()
+
+	return dbID, msgUUID, nil
+}
+
+// EnqueueMessage adds a message to a user's queue.
+func (database *Database) EnqueueMessage(
+	ctx context.Context,
+	userID, messageID int64,
+) error {
+	_, err := database.conn.ExecContext(ctx,
+		`INSERT OR IGNORE INTO client_queues
+		 (user_id, message_id, created_at)
+		 VALUES (?, ?, ?)`,
+		userID, messageID, time.Now())
+	if err != nil {
+		return fmt.Errorf("enqueue message: %w", err)
+	}
+
+	return nil
+}
+
+// PollMessages returns queued messages for a user.
+func (database *Database) PollMessages(
+	ctx context.Context,
+	userID, afterQueueID int64,
+	limit int,
+) ([]IRCMessage, int64, error) {
+	if limit <= 0 {
+		limit = defaultPollLimit
+	}
+
+	rows, err := database.conn.QueryContext(ctx,
+		`SELECT cq.id, m.uuid, m.command,
+		   m.msg_from, m.msg_to,
+		   m.body, m.meta, m.created_at
+		 FROM client_queues cq
+		 INNER JOIN messages m
+		   ON m.id = cq.message_id
+		 WHERE cq.user_id = ? AND cq.id > ?
+		 ORDER BY cq.id ASC LIMIT ?`,
+		userID, afterQueueID, limit)
+	if err != nil {
+		return nil, afterQueueID, fmt.Errorf(
+			"poll messages: %w", err,
+		)
+	}
+
+	msgs, lastQID, scanErr := scanMessages(
+		rows, afterQueueID,
+	)
+	if scanErr != nil {
+		return nil, afterQueueID, scanErr
+	}
+
+	return msgs, lastQID, nil
+}
+
+// GetHistory returns message history for a target.
+func (database *Database) GetHistory(
+	ctx context.Context,
+	target string,
+	beforeID int64,
+	limit int,
+) ([]IRCMessage, error) {
+	if limit <= 0 {
+		limit = defaultHistLimit
+	}
+
+	rows, err := database.queryHistory(
+		ctx, target, beforeID, limit,
+	)
+	if err != nil {
+		return nil, err
+	}
+
+	msgs, _, scanErr := scanMessages(rows, 0)
+	if scanErr != nil {
+		return nil, scanErr
+	}
+
+	if msgs == nil {
+		msgs = []IRCMessage{}
+	}
+
+	reverseMessages(msgs)
+
+	return msgs, nil
+}
+
+func (database *Database) queryHistory(
+	ctx context.Context,
+	target string,
+	beforeID int64,
+	limit int,
+) (*sql.Rows, error) {
+	if beforeID > 0 {
+		rows, err := database.conn.QueryContext(ctx,
+			`SELECT id, uuid, command, msg_from,
+			   msg_to, body, meta, created_at
+			 FROM messages
+			 WHERE msg_to = ? AND id < ?
+			   AND command = 'PRIVMSG'
+			 ORDER BY id DESC LIMIT ?`,
+			target, beforeID, limit)
+		if err != nil {
+			return nil, fmt.Errorf(
+				"query history: %w", err,
+			)
+		}
+
+		return rows, nil
+	}
+
+	rows, err := database.conn.QueryContext(ctx,
+		`SELECT id, uuid, command, msg_from,
+		   msg_to, body, meta, created_at
+		 FROM messages
+		 WHERE msg_to = ?
+		   AND command = 'PRIVMSG'
+		 ORDER BY id DESC LIMIT ?`,
+		target, limit)
+	if err != nil {
+		return nil, fmt.Errorf("query history: %w", err)
+	}
+
+	return rows, nil
+}
+
+func scanMessages(
+	rows *sql.Rows,
+	fallbackQID int64,
+) ([]IRCMessage, int64, error) {
+	defer func() { _ = rows.Close() }()
+
+	var msgs []IRCMessage
+
+	lastQID := fallbackQID
+
+	for rows.Next() {
+		var (
+			msg        IRCMessage
+			qID        int64
+			body, meta string
+			createdAt  time.Time
+		)
+
+		err := rows.Scan(
+			&qID, &msg.ID, &msg.Command,
+			&msg.From, &msg.To,
+			&body, &meta, &createdAt,
+		)
+		if err != nil {
+			return nil, fallbackQID, fmt.Errorf(
+				"scan message: %w", err,
+			)
+		}
+
+		msg.Body = json.RawMessage(body)
+		msg.Meta = json.RawMessage(meta)
+		msg.TS = createdAt.Format(time.RFC3339Nano)
+		msg.DBID = qID
+		lastQID = qID
+
+		msgs = append(msgs, msg)
+	}
+
+	err := rows.Err()
+	if err != nil {
+		return nil, fallbackQID, fmt.Errorf(
+			"rows error: %w", err,
+		)
+	}
+
+	if msgs == nil {
+		msgs = []IRCMessage{}
+	}
+
+	return msgs, lastQID, nil
+}
+
+func reverseMessages(msgs []IRCMessage) {
+	for i, j := 0, len(msgs)-1; i < j; i, j = i+1, j-1 {
+		msgs[i], msgs[j] = msgs[j], msgs[i]
+	}
+}
+
+// ChangeNick updates a user's nickname.
+func (database *Database) ChangeNick(
+	ctx context.Context,
+	userID int64,
+	newNick string,
+) error {
+	_, err := database.conn.ExecContext(ctx,
+		"UPDATE users SET nick = ? WHERE id = ?",
+		newNick, userID)
+	if err != nil {
+		return fmt.Errorf("change nick: %w", err)
+	}
+
+	return nil
+}
+
+// SetTopic sets the topic for a channel.
+func (database *Database) SetTopic(
+	ctx context.Context,
+	channelName, topic string,
+) error {
+	_, err := database.conn.ExecContext(ctx,
+		`UPDATE channels SET topic = ?,
+		 updated_at = ? WHERE name = ?`,
+		topic, time.Now(), channelName)
+	if err != nil {
+		return fmt.Errorf("set topic: %w", err)
+	}
+
+	return nil
+}
+
+// DeleteUser removes a user and all their data.
+func (database *Database) DeleteUser(
+	ctx context.Context,
+	userID int64,
+) error {
+	_, err := database.conn.ExecContext(
+		ctx,
+		"DELETE FROM users WHERE id = ?",
+		userID,
+	)
+	if err != nil {
+		return fmt.Errorf("delete user: %w", err)
+	}
+
+	return nil
+}
+
+// GetAllChannelMembershipsForUser returns channels
+// a user belongs to.
+func (database *Database) GetAllChannelMembershipsForUser(
+	ctx context.Context,
+	userID int64,
+) ([]ChannelInfo, error) {
+	rows, err := database.conn.QueryContext(ctx,
+		`SELECT c.id, c.name, c.topic
+		 FROM channels c
+		 INNER JOIN channel_members cm
+		   ON cm.channel_id = c.id
+		 WHERE cm.user_id = ?`, userID)
+	if err != nil {
+		return nil, fmt.Errorf(
+			"get memberships: %w", err,
+		)
+	}
+
+	return scanChannels(rows)
+}

internal/db/queries_test.go

@@ -0,0 +1,569 @@
+package db_test
+
+import (
+	"encoding/json"
+	"testing"
+
+	"git.eeqj.de/sneak/chat/internal/db"
+
+	_ "modernc.org/sqlite"
+)
+
+func setupTestDB(t *testing.T) *db.Database {
+	t.Helper()
+
+	database, err := db.NewTestDatabase()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	t.Cleanup(func() {
+		closeErr := database.Close()
+		if closeErr != nil {
+			t.Logf("close db: %v", closeErr)
+		}
+	})
+
+	return database
+}
+
+func TestCreateUser(t *testing.T) {
+	t.Parallel()
+
+	database := setupTestDB(t)
+	ctx := t.Context()
+
+	id, token, err := database.CreateUser(ctx, "alice")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if id == 0 || token == "" {
+		t.Fatal("expected valid id and token")
+	}
+
+	_, _, err = database.CreateUser(ctx, "alice")
+	if err == nil {
+		t.Fatal("expected error for duplicate nick")
+	}
+}
+
+func TestGetUserByToken(t *testing.T) {
+	t.Parallel()
+
+	database := setupTestDB(t)
+	ctx := t.Context()
+
+	_, token, err := database.CreateUser(ctx, "bob")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	id, nick, err := database.GetUserByToken(ctx, token)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if nick != "bob" || id == 0 {
+		t.Fatalf("expected bob, got %s", nick)
+	}
+
+	_, _, err = database.GetUserByToken(ctx, "badtoken")
+	if err == nil {
+		t.Fatal("expected error for bad token")
+	}
+}
+
+func TestGetUserByNick(t *testing.T) {
+	t.Parallel()
+
+	database := setupTestDB(t)
+	ctx := t.Context()
+
+	_, _, err := database.CreateUser(ctx, "charlie")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	id, err := database.GetUserByNick(ctx, "charlie")
+	if err != nil || id == 0 {
+		t.Fatal("expected to find charlie")
+	}
+
+	_, err = database.GetUserByNick(ctx, "nobody")
+	if err == nil {
+		t.Fatal("expected error for unknown nick")
+	}
+}
+
+func TestChannelOperations(t *testing.T) {
+	t.Parallel()
+
+	database := setupTestDB(t)
+	ctx := t.Context()
+
+	chID, err := database.GetOrCreateChannel(ctx, "#test")
+	if err != nil || chID == 0 {
+		t.Fatal("expected channel id")
+	}
+
+	chID2, err := database.GetOrCreateChannel(ctx, "#test")
+	if err != nil || chID2 != chID {
+		t.Fatal("expected same channel id")
+	}
+
+	chID3, err := database.GetChannelByName(ctx, "#test")
+	if err != nil || chID3 != chID {
+		t.Fatal("expected same channel id")
+	}
+
+	_, err = database.GetChannelByName(ctx, "#nope")
+	if err == nil {
+		t.Fatal("expected error for nonexistent channel")
+	}
+}
+
+func TestJoinAndPart(t *testing.T) {
+	t.Parallel()
+
+	database := setupTestDB(t)
+	ctx := t.Context()
+
+	uid, _, err := database.CreateUser(ctx, "user1")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	chID, err := database.GetOrCreateChannel(ctx, "#chan")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	err = database.JoinChannel(ctx, chID, uid)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	ids, err := database.GetChannelMemberIDs(ctx, chID)
+	if err != nil || len(ids) != 1 || ids[0] != uid {
+		t.Fatal("expected user in channel")
+	}
+
+	err = database.JoinChannel(ctx, chID, uid)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	err = database.PartChannel(ctx, chID, uid)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	ids, _ = database.GetChannelMemberIDs(ctx, chID)
+	if len(ids) != 0 {
+		t.Fatal("expected empty channel")
+	}
+}
+
+func TestDeleteChannelIfEmpty(t *testing.T) {
+	t.Parallel()
+
+	database := setupTestDB(t)
+	ctx := t.Context()
+
+	chID, err := database.GetOrCreateChannel(
+		ctx, "#empty",
+	)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	uid, _, err := database.CreateUser(ctx, "temp")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	err = database.JoinChannel(ctx, chID, uid)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	err = database.PartChannel(ctx, chID, uid)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	err = database.DeleteChannelIfEmpty(ctx, chID)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	_, err = database.GetChannelByName(ctx, "#empty")
+	if err == nil {
+		t.Fatal("expected channel to be deleted")
+	}
+}
+
+func createUserWithChannels(
+	t *testing.T,
+	database *db.Database,
+	nick, ch1Name, ch2Name string,
+) (int64, int64, int64) {
+	t.Helper()
+
+	ctx := t.Context()
+
+	uid, _, err := database.CreateUser(ctx, nick)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	ch1, err := database.GetOrCreateChannel(
+		ctx, ch1Name,
+	)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	ch2, err := database.GetOrCreateChannel(
+		ctx, ch2Name,
+	)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	err = database.JoinChannel(ctx, ch1, uid)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	err = database.JoinChannel(ctx, ch2, uid)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	return uid, ch1, ch2
+}
+
+func TestListChannels(t *testing.T) {
+	t.Parallel()
+
+	database := setupTestDB(t)
+	uid, _, _ := createUserWithChannels(
+		t, database, "lister", "#a", "#b",
+	)
+
+	channels, err := database.ListChannels(
+		t.Context(), uid,
+	)
+	if err != nil || len(channels) != 2 {
+		t.Fatalf(
+			"expected 2 channels, got %d",
+			len(channels),
+		)
+	}
+}
+
+func TestListAllChannels(t *testing.T) {
+	t.Parallel()
+
+	database := setupTestDB(t)
+	ctx := t.Context()
+
+	_, err := database.GetOrCreateChannel(ctx, "#x")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	_, err = database.GetOrCreateChannel(ctx, "#y")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	channels, err := database.ListAllChannels(ctx)
+	if err != nil || len(channels) < 2 {
+		t.Fatalf(
+			"expected >= 2 channels, got %d",
+			len(channels),
+		)
+	}
+}
+
+func TestChangeNick(t *testing.T) {
+	t.Parallel()
+
+	database := setupTestDB(t)
+	ctx := t.Context()
+
+	uid, token, err := database.CreateUser(ctx, "old")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	err = database.ChangeNick(ctx, uid, "new")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	_, nick, err := database.GetUserByToken(ctx, token)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if nick != "new" {
+		t.Fatalf("expected new, got %s", nick)
+	}
+}
+
+func TestSetTopic(t *testing.T) {
+	t.Parallel()
+
+	database := setupTestDB(t)
+	ctx := t.Context()
+
+	_, err := database.GetOrCreateChannel(
+		ctx, "#topictest",
+	)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	err = database.SetTopic(ctx, "#topictest", "Hello")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	channels, err := database.ListAllChannels(ctx)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	for _, ch := range channels {
+		if ch.Name == "#topictest" &&
+			ch.Topic != "Hello" {
+			t.Fatalf(
+				"expected topic Hello, got %s",
+				ch.Topic,
+			)
+		}
+	}
+}
+
+func TestInsertMessage(t *testing.T) {
+	t.Parallel()
+
+	database := setupTestDB(t)
+	ctx := t.Context()
+
+	body := json.RawMessage(`["hello"]`)
+
+	dbID, msgUUID, err := database.InsertMessage(
+		ctx, "PRIVMSG", "poller", "#test", body, nil,
+	)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if dbID == 0 || msgUUID == "" {
+		t.Fatal("expected valid id and uuid")
+	}
+}
+
+func TestPollMessages(t *testing.T) {
+	t.Parallel()
+
+	database := setupTestDB(t)
+	ctx := t.Context()
+
+	uid, _, err := database.CreateUser(ctx, "poller")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	body := json.RawMessage(`["hello"]`)
+
+	dbID, _, err := database.InsertMessage(
+		ctx, "PRIVMSG", "poller", "#test", body, nil,
+	)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	err = database.EnqueueMessage(ctx, uid, dbID)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	const batchSize = 10
+
+	msgs, lastQID, err := database.PollMessages(
+		ctx, uid, 0, batchSize,
+	)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if len(msgs) != 1 {
+		t.Fatalf(
+			"expected 1 message, got %d", len(msgs),
+		)
+	}
+
+	if msgs[0].Command != "PRIVMSG" {
+		t.Fatalf(
+			"expected PRIVMSG, got %s", msgs[0].Command,
+		)
+	}
+
+	if lastQID == 0 {
+		t.Fatal("expected nonzero lastQID")
+	}
+
+	msgs, _, _ = database.PollMessages(
+		ctx, uid, lastQID, batchSize,
+	)
+
+	if len(msgs) != 0 {
+		t.Fatalf(
+			"expected 0 messages, got %d", len(msgs),
+		)
+	}
+}
+
+func TestGetHistory(t *testing.T) {
+	t.Parallel()
+
+	database := setupTestDB(t)
+	ctx := t.Context()
+
+	const msgCount = 10
+
+	for range msgCount {
+		_, _, err := database.InsertMessage(
+			ctx, "PRIVMSG", "user", "#hist",
+			json.RawMessage(`["msg"]`), nil,
+		)
+		if err != nil {
+			t.Fatal(err)
+		}
+	}
+
+	const histLimit = 5
+
+	msgs, err := database.GetHistory(
+		ctx, "#hist", 0, histLimit,
+	)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if len(msgs) != histLimit {
+		t.Fatalf("expected %d, got %d",
+			histLimit, len(msgs))
+	}
+
+	if msgs[0].DBID > msgs[histLimit-1].DBID {
+		t.Fatal("expected ascending order")
+	}
+}
+
+func TestDeleteUser(t *testing.T) {
+	t.Parallel()
+
+	database := setupTestDB(t)
+	ctx := t.Context()
+
+	uid, _, err := database.CreateUser(ctx, "deleteme")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	chID, err := database.GetOrCreateChannel(
+		ctx, "#delchan",
+	)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	err = database.JoinChannel(ctx, chID, uid)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	err = database.DeleteUser(ctx, uid)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	_, err = database.GetUserByNick(ctx, "deleteme")
+	if err == nil {
+		t.Fatal("user should be deleted")
+	}
+
+	ids, _ := database.GetChannelMemberIDs(ctx, chID)
+	if len(ids) != 0 {
+		t.Fatal("expected no members after deletion")
+	}
+}
+
+func TestChannelMembers(t *testing.T) {
+	t.Parallel()
+
+	database := setupTestDB(t)
+	ctx := t.Context()
+
+	uid1, _, err := database.CreateUser(ctx, "m1")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	uid2, _, err := database.CreateUser(ctx, "m2")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	chID, err := database.GetOrCreateChannel(
+		ctx, "#members",
+	)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	err = database.JoinChannel(ctx, chID, uid1)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	err = database.JoinChannel(ctx, chID, uid2)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	members, err := database.ChannelMembers(ctx, chID)
+	if err != nil || len(members) != 2 {
+		t.Fatalf(
+			"expected 2 members, got %d",
+			len(members),
+		)
+	}
+}
+
+func TestGetAllChannelMembershipsForUser(t *testing.T) {
+	t.Parallel()
+
+	database := setupTestDB(t)
+	uid, _, _ := createUserWithChannels(
+		t, database, "multi", "#m1", "#m2",
+	)
+
+	channels, err :=
+		database.GetAllChannelMembershipsForUser(
+			t.Context(), uid,
+		)
+	if err != nil || len(channels) != 2 {
+		t.Fatalf(
+			"expected 2 channels, got %d",
+			len(channels),
+		)
+	}
+}

internal/db/schema/001_initial.sql

@@ -1,4 +1,54 @@
-CREATE TABLE IF NOT EXISTS schema_migrations (
-    version INTEGER PRIMARY KEY,
-    applied_at DATETIME DEFAULT CURRENT_TIMESTAMP
+-- Chat server schema (pre-1.0 consolidated)
+PRAGMA foreign_keys = ON;
+
+-- Users: IRC-style sessions (no passwords, just nick + token)
+CREATE TABLE IF NOT EXISTS users (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    nick TEXT NOT NULL UNIQUE,
+    token TEXT NOT NULL UNIQUE,
+    created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
+    last_seen DATETIME DEFAULT CURRENT_TIMESTAMP
 );
+CREATE INDEX IF NOT EXISTS idx_users_token ON users(token);
+
+-- Channels
+CREATE TABLE IF NOT EXISTS channels (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    name TEXT NOT NULL UNIQUE,
+    topic TEXT NOT NULL DEFAULT '',
+    created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
+    updated_at DATETIME DEFAULT CURRENT_TIMESTAMP
+);
+
+-- Channel members
+CREATE TABLE IF NOT EXISTS channel_members (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    channel_id INTEGER NOT NULL REFERENCES channels(id) ON DELETE CASCADE,
+    user_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    joined_at DATETIME DEFAULT CURRENT_TIMESTAMP,
+    UNIQUE(channel_id, user_id)
+);
+
+-- Messages: IRC envelope format
+CREATE TABLE IF NOT EXISTS messages (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    uuid TEXT NOT NULL UNIQUE,
+    command TEXT NOT NULL DEFAULT 'PRIVMSG',
+    msg_from TEXT NOT NULL DEFAULT '',
+    msg_to TEXT NOT NULL DEFAULT '',
+    body TEXT NOT NULL DEFAULT '[]',
+    meta TEXT NOT NULL DEFAULT '{}',
+    created_at DATETIME DEFAULT CURRENT_TIMESTAMP
+);
+CREATE INDEX IF NOT EXISTS idx_messages_to_id ON messages(msg_to, id);
+CREATE INDEX IF NOT EXISTS idx_messages_created ON messages(created_at);
+
+-- Per-client message queues for fan-out delivery
+CREATE TABLE IF NOT EXISTS client_queues (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    user_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    message_id INTEGER NOT NULL REFERENCES messages(id) ON DELETE CASCADE,
+    created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
+    UNIQUE(user_id, message_id)
+);
+CREATE INDEX IF NOT EXISTS idx_client_queues_user ON client_queues(user_id, id);

internal/db/schema/002_tables.sql

@@ -1,8 +0,0 @@
-CREATE TABLE IF NOT EXISTS channels (
-    id INTEGER PRIMARY KEY AUTOINCREMENT,
-    name TEXT NOT NULL UNIQUE,
-    topic TEXT NOT NULL DEFAULT '',
-    modes TEXT NOT NULL DEFAULT '',
-    created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
-    updated_at DATETIME DEFAULT CURRENT_TIMESTAMP
-);

internal/handlers/handlers.go

@@ -4,9 +4,12 @@ package handlers
 import (
 	"context"
 	"encoding/json"
+	"errors"
 	"log/slog"
 	"net/http"
 
+	"git.eeqj.de/sneak/chat/internal/broker"
+	"git.eeqj.de/sneak/chat/internal/config"
 	"git.eeqj.de/sneak/chat/internal/db"
 	"git.eeqj.de/sneak/chat/internal/globals"
 	"git.eeqj.de/sneak/chat/internal/healthcheck"
@@ -14,12 +17,15 @@ import (
 	"go.uber.org/fx"
 )
 
+var errUnauthorized = errors.New("unauthorized")
+
 // Params defines the dependencies for creating Handlers.
 type Params struct {
 	fx.In
 
 	Logger      *logger.Logger
 	Globals     *globals.Globals
+	Config      *config.Config
 	Database    *db.Database
 	Healthcheck *healthcheck.Healthcheck
 }
@@ -29,32 +35,64 @@ type Handlers struct {
 	params *Params
 	log    *slog.Logger
 	hc     *healthcheck.Healthcheck
+	broker *broker.Broker
 }
 
 // New creates a new Handlers instance.
-func New(lc fx.Lifecycle, params Params) (*Handlers, error) {
-	s := new(Handlers)
-	s.params = &params
-	s.log = params.Logger.Get()
-	s.hc = params.Healthcheck
+func New(
+	lifecycle fx.Lifecycle,
+	params Params,
+) (*Handlers, error) {
+	hdlr := &Handlers{
+		params: &params,
+		log:    params.Logger.Get(),
+		hc:     params.Healthcheck,
+		broker: broker.New(),
+	}
 
-	lc.Append(fx.Hook{
+	lifecycle.Append(fx.Hook{
 		OnStart: func(_ context.Context) error {
 			return nil
 		},
+		OnStop: func(_ context.Context) error {
+			return nil
+		},
 	})
 
-	return s, nil
+	return hdlr, nil
 }
 
-func (s *Handlers) respondJSON(w http.ResponseWriter, _ *http.Request, data any, status int) {
-	w.WriteHeader(status)
-	w.Header().Set("Content-Type", "application/json")
+func (hdlr *Handlers) respondJSON(
+	writer http.ResponseWriter,
+	_ *http.Request,
+	data any,
+	status int,
+) {
+	writer.Header().Set(
+		"Content-Type",
+		"application/json; charset=utf-8",
+	)
+	writer.WriteHeader(status)
 
 	if data != nil {
-		err := json.NewEncoder(w).Encode(data)
+		err := json.NewEncoder(writer).Encode(data)
 		if err != nil {
-			s.log.Error("json encode error", "error", err)
+			hdlr.log.Error(
+				"json encode error", "error", err,
+			)
 		}
 	}
 }
+
+func (hdlr *Handlers) respondError(
+	writer http.ResponseWriter,
+	request *http.Request,
+	msg string,
+	status int,
+) {
+	hdlr.respondJSON(
+		writer, request,
+		map[string]string{"error": msg},
+		status,
+	)
+}

internal/handlers/healthcheck.go

@@ -7,9 +7,12 @@ import (
 const httpStatusOK = 200
 
 // HandleHealthCheck returns an HTTP handler for the health check endpoint.
-func (s *Handlers) HandleHealthCheck() http.HandlerFunc {
-	return func(w http.ResponseWriter, req *http.Request) {
-		resp := s.hc.Healthcheck()
-		s.respondJSON(w, req, resp, httpStatusOK)
+func (hdlr *Handlers) HandleHealthCheck() http.HandlerFunc {
+	return func(
+		writer http.ResponseWriter,
+		request *http.Request,
+	) {
+		resp := hdlr.hc.Healthcheck()
+		hdlr.respondJSON(writer, request, resp, httpStatusOK)
 	}
 }

internal/healthcheck/healthcheck.go

@@ -33,14 +33,17 @@ type Healthcheck struct {
 }
 
 // New creates a new Healthcheck instance.
-func New(lc fx.Lifecycle, params Params) (*Healthcheck, error) {
-	s := new(Healthcheck)
-	s.params = &params
-	s.log = params.Logger.Get()
+func New(
+	lifecycle fx.Lifecycle, params Params,
+) (*Healthcheck, error) {
+	hcheck := &Healthcheck{ //nolint:exhaustruct // StartupTime set in OnStart
+		params: &params,
+		log:    params.Logger.Get(),
+	}
 
-	lc.Append(fx.Hook{
+	lifecycle.Append(fx.Hook{
 		OnStart: func(_ context.Context) error {
-			s.StartupTime = time.Now()
+			hcheck.StartupTime = time.Now()
 
 			return nil
 		},
@@ -49,7 +52,7 @@ func New(lc fx.Lifecycle, params Params) (*Healthcheck, error) {
 		},
 	})
 
-	return s, nil
+	return hcheck, nil
 }
 
 // Response is the JSON response returned by the health endpoint.
@@ -64,19 +67,18 @@ type Response struct {
 }
 
 // Healthcheck returns the current health status of the server.
-func (s *Healthcheck) Healthcheck() *Response {
-	resp := &Response{
+func (hcheck *Healthcheck) Healthcheck() *Response {
+	return &Response{
 		Status:        "ok",
 		Now:           time.Now().UTC().Format(time.RFC3339Nano),
-		UptimeSeconds: int64(s.uptime().Seconds()),
-		UptimeHuman:   s.uptime().String(),
-		Appname:       s.params.Globals.Appname,
-		Version:       s.params.Globals.Version,
+		UptimeSeconds: int64(hcheck.uptime().Seconds()),
+		UptimeHuman:   hcheck.uptime().String(),
+		Appname:       hcheck.params.Globals.Appname,
+		Version:       hcheck.params.Globals.Version,
+		Maintenance:   hcheck.params.Config.MaintenanceMode,
 	}
-
-	return resp
 }
 
-func (s *Healthcheck) uptime() time.Duration {
-	return time.Since(s.StartupTime)
+func (hcheck *Healthcheck) uptime() time.Duration {
+	return time.Since(hcheck.StartupTime)
 }

internal/logger/logger.go

@@ -23,51 +23,56 @@ type Logger struct {
 	params Params
 }
 
-// New creates a new Logger with appropriate handler based on terminal detection.
-func New(_ fx.Lifecycle, params Params) (*Logger, error) {
-	l := new(Logger)
-	l.level = new(slog.LevelVar)
-	l.level.Set(slog.LevelInfo)
+// New creates a new Logger with appropriate handler
+// based on terminal detection.
+func New(
+	_ fx.Lifecycle, params Params,
+) (*Logger, error) {
+	logger := new(Logger)
+	logger.level = new(slog.LevelVar)
+	logger.level.Set(slog.LevelInfo)
 
 	tty := false
+
 	if fileInfo, _ := os.Stdout.Stat(); (fileInfo.Mode() & os.ModeCharDevice) != 0 {
 		tty = true
 	}
 
-	var handler slog.Handler
-	if tty {
-		handler = slog.NewTextHandler(os.Stdout, &slog.HandlerOptions{
-			Level:     l.level,
+	opts := &slog.HandlerOptions{ //nolint:exhaustruct // ReplaceAttr optional
+		Level:     logger.level,
 		AddSource: true,
-		})
-	} else {
-		handler = slog.NewJSONHandler(os.Stdout, &slog.HandlerOptions{
-			Level:     l.level,
-			AddSource: true,
-		})
 	}
 
-	l.log = slog.New(handler)
-	l.params = params
+	var handler slog.Handler
+	if tty {
+		handler = slog.NewTextHandler(os.Stdout, opts)
+	} else {
+		handler = slog.NewJSONHandler(os.Stdout, opts)
+	}
 
-	return l, nil
+	logger.log = slog.New(handler)
+	logger.params = params
+
+	return logger, nil
 }
 
 // EnableDebugLogging switches the log level to debug.
-func (l *Logger) EnableDebugLogging() {
-	l.level.Set(slog.LevelDebug)
-	l.log.Debug("debug logging enabled", "debug", true)
+func (logger *Logger) EnableDebugLogging() {
+	logger.level.Set(slog.LevelDebug)
+	logger.log.Debug(
+		"debug logging enabled", "debug", true,
+	)
 }
 
 // Get returns the underlying slog.Logger.
-func (l *Logger) Get() *slog.Logger {
-	return l.log
+func (logger *Logger) Get() *slog.Logger {
+	return logger.log
 }
 
 // Identify logs the application name and version at startup.
-func (l *Logger) Identify() {
-	l.log.Info("starting",
-		"appname", l.params.Globals.Appname,
-		"version", l.params.Globals.Version,
+func (logger *Logger) Identify() {
+	logger.log.Info("starting",
+		"appname", logger.params.Globals.Appname,
+		"version", logger.params.Globals.Version,
 	)
 }

internal/middleware/middleware.go

@@ -11,7 +11,7 @@ import (
 	"git.eeqj.de/sneak/chat/internal/globals"
 	"git.eeqj.de/sneak/chat/internal/logger"
 	basicauth "github.com/99designs/basicauth-go"
-	"github.com/go-chi/chi/middleware"
+	chimw "github.com/go-chi/chi/middleware"
 	"github.com/go-chi/cors"
 	metrics "github.com/slok/go-http-metrics/metrics/prometheus"
 	ghmm "github.com/slok/go-http-metrics/middleware"
@@ -38,25 +38,28 @@ type Middleware struct {
 }
 
 // New creates a new Middleware instance.
-func New(_ fx.Lifecycle, params Params) (*Middleware, error) {
-	s := new(Middleware)
-	s.params = &params
-	s.log = params.Logger.Get()
+func New(
+	_ fx.Lifecycle, params Params,
+) (*Middleware, error) {
+	mware := &Middleware{
+		params: &params,
+		log:    params.Logger.Get(),
+	}
 
-	return s, nil
+	return mware, nil
 }
 
-func ipFromHostPort(hp string) string {
-	h, _, err := net.SplitHostPort(hp)
+func ipFromHostPort(hostPort string) string {
+	host, _, err := net.SplitHostPort(hostPort)
 	if err != nil {
 		return ""
 	}
 
-	if len(h) > 0 && h[0] == '[' {
-		return h[1 : len(h)-1]
+	if len(host) > 0 && host[0] == '[' {
+		return host[1 : len(host)-1]
 	}
 
-	return h
+	return host
 }
 
 type loggingResponseWriter struct {
@@ -65,9 +68,15 @@ type loggingResponseWriter struct {
 	statusCode int
 }
 
-// newLoggingResponseWriter wraps a ResponseWriter to capture the status code.
-func newLoggingResponseWriter(w http.ResponseWriter) *loggingResponseWriter {
-	return &loggingResponseWriter{w, http.StatusOK}
+// newLoggingResponseWriter wraps a ResponseWriter
+// to capture the status code.
+func newLoggingResponseWriter(
+	writer http.ResponseWriter,
+) *loggingResponseWriter {
+	return &loggingResponseWriter{
+		ResponseWriter: writer,
+		statusCode:     http.StatusOK,
+	}
 }
 
 func (lrw *loggingResponseWriter) WriteHeader(code int) {
@@ -76,43 +85,57 @@ func (lrw *loggingResponseWriter) WriteHeader(code int) {
 }
 
 // Logging returns middleware that logs each HTTP request.
-func (s *Middleware) Logging() func(http.Handler) http.Handler {
+func (mware *Middleware) Logging() func(http.Handler) http.Handler {
 	return func(next http.Handler) http.Handler {
-		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		return http.HandlerFunc(
+			func(
+				writer http.ResponseWriter,
+				request *http.Request,
+			) {
 				start := time.Now()
-			lrw := newLoggingResponseWriter(w)
-			ctx := r.Context()
+				lrw := newLoggingResponseWriter(writer)
+				ctx := request.Context()
 
 				defer func() {
 					latency := time.Since(start)
 
-				reqID, _ := ctx.Value(middleware.RequestIDKey).(string)
+					reqID, _ := ctx.Value(
+						chimw.RequestIDKey,
+					).(string)
 
-				s.log.InfoContext(ctx, "request",
+					mware.log.InfoContext(
+						ctx, "request",
 						"request_start", start,
-					"method", r.Method,
-					"url", r.URL.String(),
-					"useragent", r.UserAgent(),
+						"method", request.Method,
+						"url", request.URL.String(),
+						"useragent", request.UserAgent(),
 						"request_id", reqID,
-					"referer", r.Referer(),
-					"proto", r.Proto,
-					"remoteIP", ipFromHostPort(r.RemoteAddr),
+						"referer", request.Referer(),
+						"proto", request.Proto,
+						"remoteIP",
+						ipFromHostPort(request.RemoteAddr),
 						"status", lrw.statusCode,
-					"latency_ms", latency.Milliseconds(),
+						"latency_ms",
+						latency.Milliseconds(),
 					)
 				}()
 
-			next.ServeHTTP(lrw, r)
+				next.ServeHTTP(lrw, request)
 			})
 	}
 }
 
 // CORS returns middleware that handles Cross-Origin Resource Sharing.
-func (s *Middleware) CORS() func(http.Handler) http.Handler {
-	return cors.Handler(cors.Options{
+func (mware *Middleware) CORS() func(http.Handler) http.Handler {
+	return cors.Handler(cors.Options{ //nolint:exhaustruct // optional fields
 		AllowedOrigins: []string{"*"},
-		AllowedMethods:   []string{"GET", "POST", "PUT", "DELETE", "OPTIONS"},
-		AllowedHeaders:   []string{"Accept", "Authorization", "Content-Type", "X-CSRF-Token"},
+		AllowedMethods: []string{
+			"GET", "POST", "PUT", "DELETE", "OPTIONS",
+		},
+		AllowedHeaders: []string{
+			"Accept", "Authorization",
+			"Content-Type", "X-CSRF-Token",
+		},
 		ExposedHeaders:   []string{"Link"},
 		AllowCredentials: false,
 		MaxAge:           corsMaxAge,
@@ -120,28 +143,34 @@ func (s *Middleware) CORS() func(http.Handler) http.Handler {
 }
 
 // Auth returns middleware that performs authentication.
-func (s *Middleware) Auth() func(http.Handler) http.Handler {
+func (mware *Middleware) Auth() func(http.Handler) http.Handler {
 	return func(next http.Handler) http.Handler {
-		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-			s.log.Info("AUTH: before request")
-			next.ServeHTTP(w, r)
+		return http.HandlerFunc(
+			func(
+				writer http.ResponseWriter,
+				request *http.Request,
+			) {
+				mware.log.Info("AUTH: before request")
+				next.ServeHTTP(writer, request)
 			})
 	}
 }
 
 // Metrics returns middleware that records HTTP metrics.
-func (s *Middleware) Metrics() func(http.Handler) http.Handler {
-	mdlw := ghmm.New(ghmm.Config{
-		Recorder: metrics.NewRecorder(metrics.Config{}),
+func (mware *Middleware) Metrics() func(http.Handler) http.Handler {
+	metricsMiddleware := ghmm.New(ghmm.Config{ //nolint:exhaustruct // optional fields
+		Recorder: metrics.NewRecorder(
+			metrics.Config{}, //nolint:exhaustruct // defaults
+		),
 	})
 
 	return func(next http.Handler) http.Handler {
-		return std.Handler("", mdlw, next)
+		return std.Handler("", metricsMiddleware, next)
 	}
 }
 
 // MetricsAuth returns middleware that protects metrics with basic auth.
-func (s *Middleware) MetricsAuth() func(http.Handler) http.Handler {
+func (mware *Middleware) MetricsAuth() func(http.Handler) http.Handler {
 	return basicauth.New(
 		"metrics",
 		map[string][]string{

internal/models/channel.go

@@ -1,17 +0,0 @@
-package models
-
-import (
-	"time"
-)
-
-// Channel represents a chat channel.
-type Channel struct {
-	Base
-
-	ID        int64     `json:"id"`
-	Name      string    `json:"name"`
-	Topic     string    `json:"topic"`
-	Modes     string    `json:"modes"`
-	CreatedAt time.Time `json:"createdAt"`
-	UpdatedAt time.Time `json:"updatedAt"`
-}

internal/models/model.go

@@ -1,20 +0,0 @@
-// Package models defines the data models used by the chat application.
-package models
-
-import "database/sql"
-
-// DB is the interface that models use to query relations.
-// This avoids a circular import with the db package.
-type DB interface {
-	GetDB() *sql.DB
-}
-
-// Base is embedded in all model structs to provide database access.
-type Base struct {
-	db DB
-}
-
-// SetDB injects the database reference into a model.
-func (b *Base) SetDB(d DB) {
-	b.db = d
-}

internal/server/http.go

@@ -4,6 +4,6 @@ import "time"
 
 const (
 	httpReadTimeout  = 10 * time.Second
-	httpWriteTimeout = 10 * time.Second
+	httpWriteTimeout = 60 * time.Second
 	maxHeaderBytes   = 1 << 20
 )

internal/server/routes.go

@@ -1,9 +1,12 @@
 package server
 
 import (
+	"io/fs"
 	"net/http"
 	"time"
 
+	"git.eeqj.de/sneak/chat/web"
+
 	sentryhttp "github.com/getsentry/sentry-go/http"
 	"github.com/go-chi/chi"
 	"github.com/go-chi/chi/middleware"
@@ -13,36 +16,138 @@ import (
 
 const routeTimeout = 60 * time.Second
 
-// SetupRoutes configures the HTTP routes and middleware chain.
-func (s *Server) SetupRoutes() {
-	s.router = chi.NewRouter()
+// SetupRoutes configures the HTTP routes and middleware.
+func (srv *Server) SetupRoutes() {
+	srv.router = chi.NewRouter()
 
-	s.router.Use(middleware.Recoverer)
-	s.router.Use(middleware.RequestID)
-	s.router.Use(s.mw.Logging())
+	srv.router.Use(middleware.Recoverer)
+	srv.router.Use(middleware.RequestID)
+	srv.router.Use(srv.mw.Logging())
 
 	if viper.GetString("METRICS_USERNAME") != "" {
-		s.router.Use(s.mw.Metrics())
+		srv.router.Use(srv.mw.Metrics())
 	}
 
-	s.router.Use(s.mw.CORS())
-	s.router.Use(middleware.Timeout(routeTimeout))
+	srv.router.Use(srv.mw.CORS())
+	srv.router.Use(middleware.Timeout(routeTimeout))
 
-	if s.sentryEnabled {
-		sentryHandler := sentryhttp.New(sentryhttp.Options{
+	if srv.sentryEnabled {
+		sentryHandler := sentryhttp.New(
+			sentryhttp.Options{ //nolint:exhaustruct // optional fields
 				Repanic: true,
-		})
-		s.router.Use(sentryHandler.Handle)
+			},
+		)
+
+		srv.router.Use(sentryHandler.Handle)
 	}
 
-	// Health check
-	s.router.Get("/.well-known/healthcheck.json", s.h.HandleHealthCheck())
+	// Health check.
+	srv.router.Get(
+		"/.well-known/healthcheck.json",
+		srv.handlers.HandleHealthCheck(),
+	)
 
-	// Protected metrics endpoint
+	// Protected metrics endpoint.
 	if viper.GetString("METRICS_USERNAME") != "" {
-		s.router.Group(func(r chi.Router) {
-			r.Use(s.mw.MetricsAuth())
-			r.Get("/metrics", http.HandlerFunc(promhttp.Handler().ServeHTTP))
+		srv.router.Group(func(router chi.Router) {
+			router.Use(srv.mw.MetricsAuth())
+			router.Get("/metrics",
+				http.HandlerFunc(
+					promhttp.Handler().ServeHTTP,
+				))
 		})
 	}
+
+	// API v1.
+	srv.router.Route(
+		"/api/v1",
+		func(router chi.Router) {
+			router.Get(
+				"/server",
+				srv.handlers.HandleServerInfo(),
+			)
+			router.Post(
+				"/session",
+				srv.handlers.HandleCreateSession(),
+			)
+			router.Get(
+				"/state",
+				srv.handlers.HandleState(),
+			)
+			router.Get(
+				"/messages",
+				srv.handlers.HandleGetMessages(),
+			)
+			router.Post(
+				"/messages",
+				srv.handlers.HandleSendCommand(),
+			)
+			router.Get(
+				"/history",
+				srv.handlers.HandleGetHistory(),
+			)
+			router.Get(
+				"/channels",
+				srv.handlers.HandleListAllChannels(),
+			)
+			router.Get(
+				"/channels/{channel}/members",
+				srv.handlers.HandleChannelMembers(),
+			)
+		},
+	)
+
+	// Serve embedded SPA.
+	srv.setupSPA()
+}
+
+func (srv *Server) setupSPA() {
+	distFS, err := fs.Sub(web.Dist, "dist")
+	if err != nil {
+		srv.log.Error(
+			"failed to get web dist filesystem",
+			"error", err,
+		)
+
+		return
+	}
+
+	fileServer := http.FileServer(http.FS(distFS))
+
+	srv.router.Get("/*", func(
+		writer http.ResponseWriter,
+		request *http.Request,
+	) {
+		readFS, ok := distFS.(fs.ReadFileFS)
+		if !ok {
+			fileServer.ServeHTTP(writer, request)
+
+			return
+		}
+
+		fileData, readErr := readFS.ReadFile(
+			request.URL.Path[1:],
+		)
+		if readErr != nil || len(fileData) == 0 {
+			indexHTML, indexErr := readFS.ReadFile(
+				"index.html",
+			)
+			if indexErr != nil {
+				http.NotFound(writer, request)
+
+				return
+			}
+
+			writer.Header().Set(
+				"Content-Type",
+				"text/html; charset=utf-8",
+			)
+			writer.WriteHeader(http.StatusOK)
+			_, _ = writer.Write(indexHTML)
+
+			return
+		}
+
+		fileServer.ServeHTTP(writer, request)
+	})
 }

internal/server/server.go

@@ -41,7 +41,8 @@ type Params struct {
 	Handlers   *handlers.Handlers
 }
 
-// Server is the main HTTP server. It manages routing, middleware, and lifecycle.
+// Server is the main HTTP server.
+// It manages routing, middleware, and lifecycle.
 type Server struct {
 	startupTime   time.Time
 	exitCode      int
@@ -53,21 +54,24 @@ type Server struct {
 	router        *chi.Mux
 	params        Params
 	mw            *middleware.Middleware
-	h             *handlers.Handlers
+	handlers      *handlers.Handlers
 }
 
 // New creates a new Server and registers its lifecycle hooks.
-func New(lc fx.Lifecycle, params Params) (*Server, error) {
-	s := new(Server)
-	s.params = params
-	s.mw = params.Middleware
-	s.h = params.Handlers
-	s.log = params.Logger.Get()
+func New(
+	lifecycle fx.Lifecycle, params Params,
+) (*Server, error) {
+	srv := &Server{ //nolint:exhaustruct // fields set during lifecycle
+		params:   params,
+		mw:       params.Middleware,
+		handlers: params.Handlers,
+		log:      params.Logger.Get(),
+	}
 
-	lc.Append(fx.Hook{
+	lifecycle.Append(fx.Hook{
 		OnStart: func(_ context.Context) error {
-			s.startupTime = time.Now()
-			go s.Run() //nolint:contextcheck
+			srv.startupTime = time.Now()
+			go srv.Run() //nolint:contextcheck
 
 			return nil
 		},
@@ -76,120 +80,140 @@ func New(lc fx.Lifecycle, params Params) (*Server, error) {
 		},
 	})
 
-	return s, nil
+	return srv, nil
 }
 
 // Run starts the server configuration, Sentry, and begins serving.
-func (s *Server) Run() {
-	s.configure()
-	s.enableSentry()
-	s.serve()
+func (srv *Server) Run() {
+	srv.configure()
+	srv.enableSentry()
+	srv.serve()
 }
 
 // ServeHTTP delegates to the chi router.
-func (s *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
-	s.router.ServeHTTP(w, r)
+func (srv *Server) ServeHTTP(
+	writer http.ResponseWriter,
+	request *http.Request,
+) {
+	srv.router.ServeHTTP(writer, request)
 }
 
 // MaintenanceMode reports whether the server is in maintenance mode.
-func (s *Server) MaintenanceMode() bool {
-	return s.params.Config.MaintenanceMode
+func (srv *Server) MaintenanceMode() bool {
+	return srv.params.Config.MaintenanceMode
 }
 
-func (s *Server) enableSentry() {
-	s.sentryEnabled = false
+func (srv *Server) enableSentry() {
+	srv.sentryEnabled = false
 
-	if s.params.Config.SentryDSN == "" {
+	if srv.params.Config.SentryDSN == "" {
 		return
 	}
 
-	err := sentry.Init(sentry.ClientOptions{
-		Dsn:     s.params.Config.SentryDSN,
-		Release: fmt.Sprintf("%s-%s", s.params.Globals.Appname, s.params.Globals.Version),
+	err := sentry.Init(sentry.ClientOptions{ //nolint:exhaustruct // only essential fields
+		Dsn: srv.params.Config.SentryDSN,
+		Release: fmt.Sprintf(
+			"%s-%s",
+			srv.params.Globals.Appname,
+			srv.params.Globals.Version,
+		),
 	})
 	if err != nil {
-		s.log.Error("sentry init failure", "error", err)
+		srv.log.Error("sentry init failure", "error", err)
 		os.Exit(1)
 	}
 
-	s.log.Info("sentry error reporting activated")
-	s.sentryEnabled = true
+	srv.log.Info("sentry error reporting activated")
+	srv.sentryEnabled = true
 }
 
-func (s *Server) serve() int {
-	s.ctx, s.cancelFunc = context.WithCancel(context.Background())
+func (srv *Server) serve() int {
+	srv.ctx, srv.cancelFunc = context.WithCancel(
+		context.Background(),
+	)
 
 	go func() {
-		c := make(chan os.Signal, 1)
+		sigCh := make(chan os.Signal, 1)
 
 		signal.Ignore(syscall.SIGPIPE)
-		signal.Notify(c, os.Interrupt, syscall.SIGTERM)
-		sig := <-c
-		s.log.Info("signal received", "signal", sig)
+		signal.Notify(sigCh, os.Interrupt, syscall.SIGTERM)
 
-		if s.cancelFunc != nil {
-			s.cancelFunc()
+		sig := <-sigCh
+
+		srv.log.Info("signal received", "signal", sig)
+
+		if srv.cancelFunc != nil {
+			srv.cancelFunc()
 		}
 	}()
 
-	go s.serveUntilShutdown()
+	go srv.serveUntilShutdown()
 
-	<-s.ctx.Done()
+	<-srv.ctx.Done()
 
-	s.cleanShutdown()
+	srv.cleanShutdown()
 
-	return s.exitCode
+	return srv.exitCode
 }
 
-func (s *Server) cleanupForExit() {
-	s.log.Info("cleaning up")
+func (srv *Server) cleanupForExit() {
+	srv.log.Info("cleaning up")
 }
 
-func (s *Server) cleanShutdown() {
-	s.exitCode = 0
+func (srv *Server) cleanShutdown() {
+	srv.exitCode = 0
 
-	ctxShutdown, shutdownCancel := context.WithTimeout(context.Background(), shutdownTimeout)
+	ctxShutdown, shutdownCancel := context.WithTimeout(
+		context.Background(), shutdownTimeout,
+	)
 
-	err := s.httpServer.Shutdown(ctxShutdown)
+	err := srv.httpServer.Shutdown(ctxShutdown)
 	if err != nil {
-		s.log.Error("server clean shutdown failed", "error", err)
+		srv.log.Error(
+			"server clean shutdown failed", "error", err,
+		)
 	}
 
 	if shutdownCancel != nil {
 		shutdownCancel()
 	}
 
-	s.cleanupForExit()
+	srv.cleanupForExit()
 
-	if s.sentryEnabled {
+	if srv.sentryEnabled {
 		sentry.Flush(sentryFlushTime)
 	}
 }
 
-func (s *Server) configure() {
-	// server configuration placeholder
+func (srv *Server) configure() {
+	// Server configuration placeholder.
 }
 
-func (s *Server) serveUntilShutdown() {
-	listenAddr := fmt.Sprintf(":%d", s.params.Config.Port)
-	s.httpServer = &http.Server{
+func (srv *Server) serveUntilShutdown() {
+	listenAddr := fmt.Sprintf(
+		":%d", srv.params.Config.Port,
+	)
+
+	srv.httpServer = &http.Server{ //nolint:exhaustruct // optional fields
 		Addr:           listenAddr,
 		ReadTimeout:    httpReadTimeout,
 		WriteTimeout:   httpWriteTimeout,
 		MaxHeaderBytes: maxHeaderBytes,
-		Handler:        s,
+		Handler:        srv,
 	}
 
-	s.SetupRoutes()
+	srv.SetupRoutes()
 
-	s.log.Info("http begin listen", "listenaddr", listenAddr)
+	srv.log.Info(
+		"http begin listen", "listenaddr", listenAddr,
+	)
 
-	err := s.httpServer.ListenAndServe()
+	err := srv.httpServer.ListenAndServe()
 	if err != nil && !errors.Is(err, http.ErrServerClosed) {
-		s.log.Error("listen error", "error", err)
+		srv.log.Error("listen error", "error", err)
 
-		if s.cancelFunc != nil {
-			s.cancelFunc()
+		if srv.cancelFunc != nil {
+			srv.cancelFunc()
 		}
 	}
 }

schema/README.md

@@ -0,0 +1,97 @@
+# Message Schemas
+
+JSON Schema definitions (draft 2020-12) for the chat protocol. Messages use
+**IRC command names and numeric reply codes** (RFC 1459/2812) encoded as JSON
+over HTTP.
+
+## Envelope
+
+Every message is a JSON object with a `command` field. The format maps directly
+to IRC wire format:
+
+```
+IRC:  :nick PRIVMSG #channel :hello world
+JSON: {"command": "PRIVMSG", "from": "nick", "to": "#channel", "body": ["hello world"]}
+
+IRC:  :server 353 nick = #channel :user1 @op1 +voice1
+JSON: {"command": "353", "to": "nick", "params": ["=", "#channel"], "body": ["user1 @op1 +voice1"]}
+
+Multiline:  {"command": "PRIVMSG", "to": "#ch", "body": ["line 1", "line 2"]}
+Structured: {"command": "PUBKEY", "body": {"alg": "ed25519", "key": "base64..."}}
+```
+
+Common fields (see `message.json` for full schema):
+
+| Field     | Type           | Description                                          |
+|-----------|----------------|------------------------------------------------------|
+| `id`      | string (uuid)  | Server-assigned message UUID                         |
+| `command` | string         | IRC command or 3-digit numeric code                  |
+| `from`    | string         | Source nick or server name (IRC prefix)              |
+| `to`      | string         | Target: #channel or nick                             |
+| `params`  | string[]       | Middle parameters (mainly for numerics)              |
+| `body`    | array \| object | Structured body — never a raw string (see below)    |
+| `ts`      | string         | ISO 8601 timestamp (server-assigned, not in raw IRC) |
+| `meta`    | object         | Extensible metadata (signatures, hashes, etc.)       |
+
+**Structured bodies:** `body` is always an array of strings (for text) or an
+object (for structured data like PUBKEY). Never a raw string. This enables:
+- Multiline messages without escape sequences
+- Deterministic canonicalization via RFC 8785 JCS for signing
+- Structured data where needed
+
+## Commands
+
+IRC commands used for client↔server and server↔server communication.
+
+| Command   | File                      | RFC       | Description                    |
+|-----------|---------------------------|-----------|--------------------------------|
+| `PRIVMSG` | `commands/PRIVMSG.json`  | 1459 §4.4.1 | Message to channel or user  |
+| `NOTICE`  | `commands/NOTICE.json`   | 1459 §4.4.2 | Notice (no auto-reply)      |
+| `JOIN`    | `commands/JOIN.json`     | 1459 §4.2.1 | Join a channel              |
+| `PART`    | `commands/PART.json`     | 1459 §4.2.2 | Leave a channel             |
+| `QUIT`    | `commands/QUIT.json`     | 1459 §4.1.6 | User disconnected           |
+| `NICK`    | `commands/NICK.json`     | 1459 §4.1.2 | Change nickname             |
+| `TOPIC`   | `commands/TOPIC.json`    | 1459 §4.2.4 | Get/set channel topic       |
+| `MODE`    | `commands/MODE.json`     | 1459 §4.2.3 | Set channel/user modes      |
+| `KICK`    | `commands/KICK.json`     | 1459 §4.2.8 | Kick user from channel      |
+| `PING`    | `commands/PING.json`     | 1459 §4.6.2 | Keepalive                   |
+| `PONG`    | `commands/PONG.json`     | 1459 §4.6.3 | Keepalive response          |
+| `PUBKEY`  | `commands/PUBKEY.json`   | (extension)  | Announce/relay signing key  |
+
+## Numeric Replies
+
+Three-digit codes for server responses, per IRC convention.
+
+### Success / Informational (0xx–3xx)
+
+| Code  | Name              | File                  | Description                    |
+|-------|-------------------|-----------------------|--------------------------------|
+| `001` | RPL_WELCOME       | `numerics/001.json`  | Welcome after session creation     |
+| `002` | RPL_YOURHOST      | `numerics/002.json`  | Server host info               |
+| `003` | RPL_CREATED       | `numerics/003.json`  | Server creation date           |
+| `004` | RPL_MYINFO        | `numerics/004.json`  | Server info and modes          |
+| `322` | RPL_LIST          | `numerics/322.json`  | Channel list entry             |
+| `323` | RPL_LISTEND       | `numerics/323.json`  | End of channel list            |
+| `332` | RPL_TOPIC         | `numerics/332.json`  | Channel topic                  |
+| `353` | RPL_NAMREPLY      | `numerics/353.json`  | Channel member list            |
+| `366` | RPL_ENDOFNAMES    | `numerics/366.json`  | End of NAMES list              |
+| `372` | RPL_MOTD          | `numerics/372.json`  | MOTD line                      |
+| `375` | RPL_MOTDSTART     | `numerics/375.json`  | Start of MOTD                  |
+| `376` | RPL_ENDOFMOTD     | `numerics/376.json`  | End of MOTD                    |
+
+### Errors (4xx)
+
+| Code  | Name                 | File                  | Description                    |
+|-------|----------------------|-----------------------|--------------------------------|
+| `401` | ERR_NOSUCHNICK       | `numerics/401.json`  | No such nick/channel           |
+| `403` | ERR_NOSUCHCHANNEL    | `numerics/403.json`  | No such channel                |
+| `433` | ERR_NICKNAMEINUSE    | `numerics/433.json`  | Nickname already in use        |
+| `442` | ERR_NOTONCHANNEL     | `numerics/442.json`  | Not on that channel            |
+| `482` | ERR_CHANOPRIVSNEEDED | `numerics/482.json`  | Not channel operator           |
+
+## Federation (S2S)
+
+Server-to-server messages use the same command format. Federated servers relay
+messages with an additional `origin` field in `meta` to track the source server.
+The PING/PONG commands serve as inter-server keepalives. State sync after link
+establishment uses a burst of JOIN, NICK, TOPIC, and MODE commands.

schema/commands/JOIN.json

@@ -0,0 +1,16 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "https://git.eeqj.de/sneak/chat/schema/commands/JOIN.json",
+  "title": "JOIN",
+  "description": "Join a channel. C2S: request to join. S2C: notification that a user joined. RFC 1459 §4.2.1.",
+  "$ref": "../message.json",
+  "properties": {
+    "command": { "const": "JOIN" },
+    "from": { "type": "string", "description": "Nick that joined (S2C)." },
+    "to": { "type": "string", "description": "Channel name.", "pattern": "^#[a-zA-Z0-9_-]+$" }
+  },
+  "required": ["command", "to"],
+  "examples": [
+    { "command": "JOIN", "from": "alice", "to": "#general" }
+  ]
+}

schema/commands/KICK.json

@@ -0,0 +1,29 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "https://git.eeqj.de/sneak/chat/schema/commands/KICK.json",
+  "title": "KICK",
+  "description": "Kick a user from a channel. RFC 1459 §4.2.8.",
+  "$ref": "../message.json",
+  "properties": {
+    "command": { "const": "KICK" },
+    "from": { "type": "string", "description": "Nick that performed the kick." },
+    "to": { "type": "string", "description": "Channel name.", "pattern": "^#[a-zA-Z0-9_-]+$" },
+    "params": {
+      "type": "array",
+      "items": { "type": "string" },
+      "description": "Kicked nick. e.g. [\"alice\"].",
+      "minItems": 1,
+      "maxItems": 1
+    },
+    "body": {
+      "type": "array",
+      "items": { "type": "string" },
+      "description": "Optional kick reason.",
+      "maxItems": 1
+    }
+  },
+  "required": ["command", "to", "params"],
+  "examples": [
+    { "command": "KICK", "from": "op1", "to": "#general", "params": ["troll"], "body": ["Behave"] }
+  ]
+}

schema/commands/MODE.json

@@ -0,0 +1,29 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "https://git.eeqj.de/sneak/chat/schema/commands/MODE.json",
+  "title": "MODE",
+  "description": "Set or query channel/user modes. RFC 1459 §4.2.3.",
+  "$ref": "../message.json",
+  "properties": {
+    "command": { "const": "MODE" },
+    "from": {
+      "type": "string",
+      "description": "Nick that set the mode (S2C only)."
+    },
+    "to": {
+      "type": "string",
+      "description": "Channel name.",
+      "pattern": "^#[a-zA-Z0-9_-]+$"
+    },
+    "params": {
+      "type": "array",
+      "items": { "type": "string" },
+      "description": "Mode string and optional target nick. e.g. [\"+o\", \"alice\"].",
+      "examples": [["+o", "alice"], ["-m"], ["+v", "bob"]]
+    }
+  },
+  "required": ["command", "to", "params"],
+  "examples": [
+    { "command": "MODE", "from": "op1", "to": "#general", "params": ["+o", "alice"] }
+  ]
+}

schema/commands/NICK.json

@@ -0,0 +1,22 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "https://git.eeqj.de/sneak/chat/schema/commands/NICK.json",
+  "title": "NICK",
+  "description": "Change nickname. C2S: request new nick. S2C: notification of nick change. RFC 1459 §4.1.2.",
+  "$ref": "../message.json",
+  "properties": {
+    "command": { "const": "NICK" },
+    "from": { "type": "string", "description": "Old nick (S2C)." },
+    "body": {
+      "type": "array",
+      "items": { "type": "string" },
+      "description": "New nick (single-element array).",
+      "minItems": 1,
+      "maxItems": 1
+    }
+  },
+  "required": ["command", "body"],
+  "examples": [
+    { "command": "NICK", "from": "oldnick", "body": ["newnick"] }
+  ]
+}

schema/commands/NOTICE.json

@@ -0,0 +1,21 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "https://git.eeqj.de/sneak/chat/schema/commands/NOTICE.json",
+  "title": "NOTICE",
+  "description": "Send a notice. Like PRIVMSG but must not trigger automatic replies. RFC 1459 §4.4.2.",
+  "$ref": "../message.json",
+  "properties": {
+    "command": { "const": "NOTICE" },
+    "from": { "type": "string" },
+    "to": { "type": "string", "description": "Target: #channel, nick, or * (global)." },
+    "body": {
+      "type": "array",
+      "items": { "type": "string" },
+      "description": "Notice text lines."
+    }
+  },
+  "required": ["command", "to", "body"],
+  "examples": [
+    { "command": "NOTICE", "from": "server.example.com", "to": "*", "body": ["Server restarting in 5 minutes"] }
+  ]
+}

schema/commands/PART.json

@@ -0,0 +1,22 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "https://git.eeqj.de/sneak/chat/schema/commands/PART.json",
+  "title": "PART",
+  "description": "Leave a channel. C2S: request to leave. S2C: notification that a user left. RFC 1459 §4.2.2.",
+  "$ref": "../message.json",
+  "properties": {
+    "command": { "const": "PART" },
+    "from": { "type": "string", "description": "Nick that left (S2C)." },
+    "to": { "type": "string", "description": "Channel name.", "pattern": "^#[a-zA-Z0-9_-]+$" },
+    "body": {
+      "type": "array",
+      "items": { "type": "string" },
+      "description": "Optional part reason.",
+      "maxItems": 1
+    }
+  },
+  "required": ["command", "to"],
+  "examples": [
+    { "command": "PART", "from": "alice", "to": "#general", "body": ["later"] }
+  ]
+}

schema/commands/PING.json

@@ -0,0 +1,20 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "https://git.eeqj.de/sneak/chat/schema/commands/PING.json",
+  "title": "PING",
+  "description": "Keepalive. C2S or S2S. Server responds with PONG. RFC 1459 §4.6.2.",
+  "$ref": "../message.json",
+  "properties": {
+    "command": { "const": "PING" },
+    "body": {
+      "type": "array",
+      "items": { "type": "string" },
+      "description": "Opaque token to be echoed in PONG (single-element array).",
+      "maxItems": 1
+    }
+  },
+  "required": ["command"],
+  "examples": [
+    { "command": "PING", "body": ["1707580000"] }
+  ]
+}

schema/commands/PONG.json

@@ -0,0 +1,21 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "https://git.eeqj.de/sneak/chat/schema/commands/PONG.json",
+  "title": "PONG",
+  "description": "Keepalive response. S2C or S2S. RFC 1459 §4.6.3.",
+  "$ref": "../message.json",
+  "properties": {
+    "command": { "const": "PONG" },
+    "from": { "type": "string", "description": "Responding server name." },
+    "body": {
+      "type": "array",
+      "items": { "type": "string" },
+      "description": "Echoed token from PING (single-element array).",
+      "maxItems": 1
+    }
+  },
+  "required": ["command"],
+  "examples": [
+    { "command": "PONG", "from": "server.example.com", "body": ["1707580000"] }
+  ]
+}

schema/commands/PRIVMSG.json

@@ -0,0 +1,24 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "https://git.eeqj.de/sneak/chat/schema/commands/PRIVMSG.json",
+  "title": "PRIVMSG",
+  "description": "Send a message to a channel or user. C2S: client sends to server. S2C: server relays to recipients. RFC 1459 §4.4.1.",
+  "$ref": "../message.json",
+  "properties": {
+    "command": { "const": "PRIVMSG" },
+    "from": { "type": "string", "description": "Sender nick (set by server on relay)." },
+    "to": { "type": "string", "description": "Target: #channel or nick.", "examples": ["#general", "alice"] },
+    "body": {
+      "type": "array",
+      "items": { "type": "string" },
+      "description": "Message lines. One string per line.",
+      "minItems": 1
+    }
+  },
+  "required": ["command", "to", "body"],
+  "examples": [
+    { "command": "PRIVMSG", "from": "bob", "to": "#general", "body": ["hello world"] },
+    { "command": "PRIVMSG", "from": "bob", "to": "#general", "body": ["line one", "line two"] },
+    { "command": "PRIVMSG", "from": "bob", "to": "alice", "body": ["hey"], "meta": { "sig": "base64...", "alg": "ed25519" } }
+  ]
+}

schema/commands/PUBKEY.json

@@ -0,0 +1,37 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "https://git.eeqj.de/sneak/chat/schema/commands/PUBKEY.json",
+  "title": "PUBKEY",
+  "description": "Announce or relay a user's public signing key. C2S: client announces key to channel or server. S2C: server relays to channel members. Protocol extension (not in RFC 1459). Body is a structured object (not an array) containing the key material.",
+  "$ref": "../message.json",
+  "properties": {
+    "command": { "const": "PUBKEY" },
+    "from": { "type": "string", "description": "Nick announcing the key (set by server on relay)." },
+    "to": {
+      "type": "string",
+      "description": "Target: #channel to announce to channel members, or omit for server-wide announcement."
+    },
+    "body": {
+      "type": "object",
+      "description": "Key material.",
+      "properties": {
+        "alg": {
+          "type": "string",
+          "description": "Key algorithm.",
+          "enum": ["ed25519"]
+        },
+        "key": {
+          "type": "string",
+          "description": "Base64-encoded public key."
+        }
+      },
+      "required": ["alg", "key"],
+      "additionalProperties": false
+    }
+  },
+  "required": ["command", "body"],
+  "examples": [
+    { "command": "PUBKEY", "from": "alice", "body": { "alg": "ed25519", "key": "base64-encoded-pubkey" } },
+    { "command": "PUBKEY", "from": "alice", "to": "#general", "body": { "alg": "ed25519", "key": "base64-encoded-pubkey" } }
+  ]
+}

schema/commands/QUIT.json

@@ -0,0 +1,21 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "https://git.eeqj.de/sneak/chat/schema/commands/QUIT.json",
+  "title": "QUIT",
+  "description": "User disconnected. S2C only. RFC 1459 §4.1.6.",
+  "$ref": "../message.json",
+  "properties": {
+    "command": { "const": "QUIT" },
+    "from": { "type": "string", "description": "Nick that quit." },
+    "body": {
+      "type": "array",
+      "items": { "type": "string" },
+      "description": "Optional quit reason.",
+      "maxItems": 1
+    }
+  },
+  "required": ["command", "from"],
+  "examples": [
+    { "command": "QUIT", "from": "alice", "body": ["Connection reset"] }
+  ]
+}

schema/commands/TOPIC.json

@@ -0,0 +1,22 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "https://git.eeqj.de/sneak/chat/schema/commands/TOPIC.json",
+  "title": "TOPIC",
+  "description": "Get or set channel topic. C2S: set topic (body present) or query (body absent). S2C: topic change notification. RFC 1459 §4.2.4.",
+  "$ref": "../message.json",
+  "properties": {
+    "command": { "const": "TOPIC" },
+    "from": { "type": "string", "description": "Nick that changed the topic (S2C)." },
+    "to": { "type": "string", "description": "Channel name.", "pattern": "^#[a-zA-Z0-9_-]+$" },
+    "body": {
+      "type": "array",
+      "items": { "type": "string" },
+      "description": "New topic text (single-element array). Empty array clears the topic.",
+      "maxItems": 1
+    }
+  },
+  "required": ["command", "to"],
+  "examples": [
+    { "command": "TOPIC", "from": "alice", "to": "#general", "body": ["Welcome to the chat"] }
+  ]
+}

schema/message.json

@@ -0,0 +1,72 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "https://git.eeqj.de/sneak/chat/schema/message.json",
+  "title": "IRC Message Envelope",
+  "description": "Base envelope for all messages. Mirrors IRC wire format (RFC 1459/2812) encoded as JSON over HTTP. The 'command' field carries either an IRC command name (PRIVMSG, JOIN, etc.) or a three-digit numeric reply code (001, 353, 433, etc.).",
+  "type": "object",
+  "properties": {
+    "id": {
+      "type": "string",
+      "format": "uuid",
+      "description": "Server-assigned message UUID. Present on all server-originated messages."
+    },
+    "command": {
+      "type": "string",
+      "description": "IRC command name (PRIVMSG, JOIN, NICK, etc.) or three-digit numeric reply code (001, 353, 433, etc.).",
+      "examples": ["PRIVMSG", "JOIN", "001", "353", "433"]
+    },
+    "from": {
+      "type": "string",
+      "description": "Source — nick for user messages, server name for server messages. Equivalent to IRC prefix."
+    },
+    "to": {
+      "type": "string",
+      "description": "Target — channel (#name) or nick. Equivalent to first IRC parameter for most commands."
+    },
+    "params": {
+      "type": "array",
+      "items": { "type": "string" },
+      "description": "Additional parameters (used primarily by numeric replies). Equivalent to IRC middle parameters."
+    },
+    "body": {
+      "oneOf": [
+        {
+          "type": "array",
+          "items": { "type": "string" },
+          "description": "Array of strings (one per line for text messages)."
+        },
+        {
+          "type": "object",
+          "description": "Structured data (e.g. PUBKEY key material).",
+          "additionalProperties": true
+        }
+      ],
+      "description": "Message body. MUST be an array or object, never a raw string. Arrays represent lines of text; objects carry structured data. This enables deterministic canonicalization (RFC 8785 JCS) for signing."
+    },
+    "ts": {
+      "type": "string",
+      "format": "date-time",
+      "description": "Server-assigned timestamp (ISO 8601). Not present in original IRC; added for HTTP transport."
+    },
+    "meta": {
+      "type": "object",
+      "description": "Extensible metadata. Used for signatures (meta.sig, meta.alg), hashes (meta.hash), and client extensions.",
+      "properties": {
+        "sig": {
+          "type": "string",
+          "description": "Base64-encoded cryptographic signature over the canonical message form."
+        },
+        "alg": {
+          "type": "string",
+          "description": "Signature algorithm (e.g. 'ed25519')."
+        },
+        "hash": {
+          "type": "string",
+          "description": "Hash of the canonical message form (e.g. 'sha256:base64...')."
+        }
+      },
+      "additionalProperties": true
+    }
+  },
+  "required": ["command"]
+}

schema/numerics/001.json

@@ -0,0 +1,37 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "https://git.eeqj.de/sneak/chat/schema/numerics/001.json",
+  "title": "001 RPL_WELCOME",
+  "description": "Welcome message sent after successful session creation. RFC 2812 \u00a75.1.",
+  "$ref": "../message.json",
+  "properties": {
+    "command": {
+      "const": "001"
+    },
+    "to": {
+      "type": "string",
+      "description": "Target nick."
+    },
+    "body": {
+      "type": "array",
+      "items": {
+        "type": "string"
+      },
+      "description": "Welcome text lines."
+    }
+  },
+  "required": [
+    "command",
+    "to",
+    "body"
+  ],
+  "examples": [
+    {
+      "command": "001",
+      "to": "alice",
+      "body": [
+        "Welcome to the network, alice"
+      ]
+    }
+  ]
+}

schema/numerics/002.json

@@ -0,0 +1,36 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "https://git.eeqj.de/sneak/chat/schema/numerics/002.json",
+  "title": "002 RPL_YOURHOST",
+  "description": "Server host info sent after session creation. RFC 2812 \u00a75.1.",
+  "$ref": "../message.json",
+  "properties": {
+    "command": {
+      "const": "002"
+    },
+    "to": {
+      "type": "string"
+    },
+    "body": {
+      "type": "array",
+      "items": {
+        "type": "string"
+      },
+      "description": "Host info lines."
+    }
+  },
+  "required": [
+    "command",
+    "to",
+    "body"
+  ],
+  "examples": [
+    {
+      "command": "002",
+      "to": "alice",
+      "body": [
+        "Your host is chat.example.com, running version 0.1.0"
+      ]
+    }
+  ]
+}

schema/numerics/003.json

@@ -0,0 +1,36 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "https://git.eeqj.de/sneak/chat/schema/numerics/003.json",
+  "title": "003 RPL_CREATED",
+  "description": "Server creation date. RFC 2812 \u00a75.1.",
+  "$ref": "../message.json",
+  "properties": {
+    "command": {
+      "const": "003"
+    },
+    "to": {
+      "type": "string"
+    },
+    "body": {
+      "type": "array",
+      "items": {
+        "type": "string"
+      },
+      "description": "Text lines."
+    }
+  },
+  "required": [
+    "command",
+    "to",
+    "body"
+  ],
+  "examples": [
+    {
+      "command": "003",
+      "to": "alice",
+      "body": [
+        "This server was created 2026-02-01"
+      ]
+    }
+  ]
+}

schema/numerics/004.json

@@ -0,0 +1,39 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "https://git.eeqj.de/sneak/chat/schema/numerics/004.json",
+  "title": "004 RPL_MYINFO",
+  "description": "Server info (name, version, available modes). RFC 2812 \u00a75.1.",
+  "$ref": "../message.json",
+  "properties": {
+    "command": {
+      "const": "004"
+    },
+    "to": {
+      "type": "string"
+    },
+    "params": {
+      "type": "array",
+      "items": {
+        "type": "string"
+      },
+      "description": "[server_name, version, user_modes, channel_modes]."
+    }
+  },
+  "required": [
+    "command",
+    "to",
+    "params"
+  ],
+  "examples": [
+    {
+      "command": "004",
+      "to": "alice",
+      "params": [
+        "chat.example.com",
+        "0.1.0",
+        "o",
+        "imnst+ov"
+      ]
+    }
+  ]
+}

schema/numerics/322.json

@@ -0,0 +1,47 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "https://git.eeqj.de/sneak/chat/schema/numerics/322.json",
+  "title": "322 RPL_LIST",
+  "description": "Channel list entry. One per channel in response to LIST. RFC 1459 \u00a76.2.",
+  "$ref": "../message.json",
+  "properties": {
+    "command": {
+      "const": "322"
+    },
+    "to": {
+      "type": "string"
+    },
+    "params": {
+      "type": "array",
+      "items": {
+        "type": "string"
+      },
+      "description": "[channel, visible_count]."
+    },
+    "body": {
+      "type": "array",
+      "items": {
+        "type": "string"
+      },
+      "description": "Channel topic."
+    }
+  },
+  "required": [
+    "command",
+    "to",
+    "params"
+  ],
+  "examples": [
+    {
+      "command": "322",
+      "to": "alice",
+      "params": [
+        "#general",
+        "12"
+      ],
+      "body": [
+        "General discussion"
+      ]
+    }
+  ]
+}

schema/numerics/323.json

@@ -0,0 +1,27 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "https://git.eeqj.de/sneak/chat/schema/numerics/323.json",
+  "title": "323 RPL_LISTEND",
+  "description": "End of channel list. RFC 1459 \u00a76.2.",
+  "$ref": "../message.json",
+  "properties": {
+    "command": {
+      "const": "323"
+    },
+    "to": {
+      "type": "string"
+    },
+    "body": {
+      "type": "array",
+      "items": {
+        "type": "string"
+      },
+      "description": "End of /LIST",
+      "maxItems": 1
+    }
+  },
+  "required": [
+    "command",
+    "to"
+  ]
+}

schema/numerics/332.json

@@ -0,0 +1,47 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "https://git.eeqj.de/sneak/chat/schema/numerics/332.json",
+  "title": "332 RPL_TOPIC",
+  "description": "Channel topic (sent on JOIN or TOPIC query). RFC 1459 \u00a76.2.",
+  "$ref": "../message.json",
+  "properties": {
+    "command": {
+      "const": "332"
+    },
+    "to": {
+      "type": "string"
+    },
+    "params": {
+      "type": "array",
+      "items": {
+        "type": "string"
+      },
+      "description": "[channel]."
+    },
+    "body": {
+      "type": "array",
+      "items": {
+        "type": "string"
+      },
+      "description": "Topic text."
+    }
+  },
+  "required": [
+    "command",
+    "to",
+    "params",
+    "body"
+  ],
+  "examples": [
+    {
+      "command": "332",
+      "to": "alice",
+      "params": [
+        "#general"
+      ],
+      "body": [
+        "Welcome to the chat"
+      ]
+    }
+  ]
+}

schema/numerics/353.json

@@ -0,0 +1,48 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "https://git.eeqj.de/sneak/chat/schema/numerics/353.json",
+  "title": "353 RPL_NAMREPLY",
+  "description": "Channel member list. Sent on JOIN or NAMES query. RFC 1459 \u00a76.2.",
+  "$ref": "../message.json",
+  "properties": {
+    "command": {
+      "const": "353"
+    },
+    "to": {
+      "type": "string"
+    },
+    "params": {
+      "type": "array",
+      "items": {
+        "type": "string"
+      },
+      "description": "[channel_type, channel]. channel_type: = (public), * (private), @ (secret)."
+    },
+    "body": {
+      "type": "array",
+      "items": {
+        "type": "string"
+      },
+      "description": "Space-separated list of nicks. Prefixed with @ for ops, + for voiced."
+    }
+  },
+  "required": [
+    "command",
+    "to",
+    "params",
+    "body"
+  ],
+  "examples": [
+    {
+      "command": "353",
+      "to": "alice",
+      "params": [
+        "=",
+        "#general"
+      ],
+      "body": [
+        "@op1 alice bob +voiced1"
+      ]
+    }
+  ]
+}

schema/numerics/366.json

@@ -0,0 +1,35 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "https://git.eeqj.de/sneak/chat/schema/numerics/366.json",
+  "title": "366 RPL_ENDOFNAMES",
+  "description": "End of NAMES list. RFC 1459 \u00a76.2.",
+  "$ref": "../message.json",
+  "properties": {
+    "command": {
+      "const": "366"
+    },
+    "to": {
+      "type": "string"
+    },
+    "params": {
+      "type": "array",
+      "items": {
+        "type": "string"
+      },
+      "description": "[channel]."
+    },
+    "body": {
+      "type": "array",
+      "items": {
+        "type": "string"
+      },
+      "description": "End of /NAMES list",
+      "maxItems": 1
+    }
+  },
+  "required": [
+    "command",
+    "to",
+    "params"
+  ]
+}

schema/numerics/372.json

@@ -0,0 +1,36 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "https://git.eeqj.de/sneak/chat/schema/numerics/372.json",
+  "title": "372 RPL_MOTD",
+  "description": "MOTD line. One message per line of the MOTD. RFC 2812 \u00a75.1.",
+  "$ref": "../message.json",
+  "properties": {
+    "command": {
+      "const": "372"
+    },
+    "to": {
+      "type": "string"
+    },
+    "body": {
+      "type": "array",
+      "items": {
+        "type": "string"
+      },
+      "description": "MOTD line text (prefixed with '- ')."
+    }
+  },
+  "required": [
+    "command",
+    "to",
+    "body"
+  ],
+  "examples": [
+    {
+      "command": "372",
+      "to": "alice",
+      "body": [
+        "- Welcome to our server!"
+      ]
+    }
+  ]
+}

schema/numerics/375.json

@@ -0,0 +1,26 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "https://git.eeqj.de/sneak/chat/schema/numerics/375.json",
+  "title": "375 RPL_MOTDSTART",
+  "description": "Start of MOTD. RFC 2812 \u00a75.1.",
+  "$ref": "../message.json",
+  "properties": {
+    "command": {
+      "const": "375"
+    },
+    "to": {
+      "type": "string"
+    },
+    "body": {
+      "type": "array",
+      "items": {
+        "type": "string"
+      },
+      "description": "Text lines."
+    }
+  },
+  "required": [
+    "command",
+    "to"
+  ]
+}

schema/numerics/376.json

@@ -0,0 +1,27 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "https://git.eeqj.de/sneak/chat/schema/numerics/376.json",
+  "title": "376 RPL_ENDOFMOTD",
+  "description": "End of MOTD. RFC 2812 \u00a75.1.",
+  "$ref": "../message.json",
+  "properties": {
+    "command": {
+      "const": "376"
+    },
+    "to": {
+      "type": "string"
+    },
+    "body": {
+      "type": "array",
+      "items": {
+        "type": "string"
+      },
+      "description": "End of /MOTD command",
+      "maxItems": 1
+    }
+  },
+  "required": [
+    "command",
+    "to"
+  ]
+}

schema/numerics/401.json

@@ -0,0 +1,47 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "https://git.eeqj.de/sneak/chat/schema/numerics/401.json",
+  "title": "401 ERR_NOSUCHNICK",
+  "description": "No such nick/channel. RFC 1459 \u00a76.1.",
+  "$ref": "../message.json",
+  "properties": {
+    "command": {
+      "const": "401"
+    },
+    "to": {
+      "type": "string"
+    },
+    "params": {
+      "type": "array",
+      "items": {
+        "type": "string"
+      },
+      "description": "[target_nick]."
+    },
+    "body": {
+      "type": "array",
+      "items": {
+        "type": "string"
+      },
+      "description": "No such nick/channel",
+      "maxItems": 1
+    }
+  },
+  "required": [
+    "command",
+    "to",
+    "params"
+  ],
+  "examples": [
+    {
+      "command": "401",
+      "to": "alice",
+      "params": [
+        "bob"
+      ],
+      "body": [
+        "No such nick/channel"
+      ]
+    }
+  ]
+}

schema/numerics/403.json

@@ -0,0 +1,47 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "https://git.eeqj.de/sneak/chat/schema/numerics/403.json",
+  "title": "403 ERR_NOSUCHCHANNEL",
+  "description": "No such channel. RFC 1459 \u00a76.1.",
+  "$ref": "../message.json",
+  "properties": {
+    "command": {
+      "const": "403"
+    },
+    "to": {
+      "type": "string"
+    },
+    "params": {
+      "type": "array",
+      "items": {
+        "type": "string"
+      },
+      "description": "[channel_name]."
+    },
+    "body": {
+      "type": "array",
+      "items": {
+        "type": "string"
+      },
+      "description": "No such channel",
+      "maxItems": 1
+    }
+  },
+  "required": [
+    "command",
+    "to",
+    "params"
+  ],
+  "examples": [
+    {
+      "command": "403",
+      "to": "alice",
+      "params": [
+        "#nonexistent"
+      ],
+      "body": [
+        "No such channel"
+      ]
+    }
+  ]
+}

schema/numerics/433.json

@@ -0,0 +1,47 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "https://git.eeqj.de/sneak/chat/schema/numerics/433.json",
+  "title": "433 ERR_NICKNAMEINUSE",
+  "description": "Nickname is already in use. RFC 1459 \u00a76.1.",
+  "$ref": "../message.json",
+  "properties": {
+    "command": {
+      "const": "433"
+    },
+    "to": {
+      "type": "string"
+    },
+    "params": {
+      "type": "array",
+      "items": {
+        "type": "string"
+      },
+      "description": "[requested_nick]."
+    },
+    "body": {
+      "type": "array",
+      "items": {
+        "type": "string"
+      },
+      "description": "Nickname is already in use",
+      "maxItems": 1
+    }
+  },
+  "required": [
+    "command",
+    "to",
+    "params"
+  ],
+  "examples": [
+    {
+      "command": "433",
+      "to": "*",
+      "params": [
+        "alice"
+      ],
+      "body": [
+        "Nickname is already in use"
+      ]
+    }
+  ]
+}

schema/numerics/442.json

@@ -0,0 +1,35 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "https://git.eeqj.de/sneak/chat/schema/numerics/442.json",
+  "title": "442 ERR_NOTONCHANNEL",
+  "description": "You're not on that channel. RFC 1459 \u00a76.1.",
+  "$ref": "../message.json",
+  "properties": {
+    "command": {
+      "const": "442"
+    },
+    "to": {
+      "type": "string"
+    },
+    "params": {
+      "type": "array",
+      "items": {
+        "type": "string"
+      },
+      "description": "[channel]."
+    },
+    "body": {
+      "type": "array",
+      "items": {
+        "type": "string"
+      },
+      "description": "You're not on that channel",
+      "maxItems": 1
+    }
+  },
+  "required": [
+    "command",
+    "to",
+    "params"
+  ]
+}

schema/numerics/482.json

@@ -0,0 +1,35 @@
+{
+  "$schema": "https://json-schema.org/draft/2020-12/schema",
+  "$id": "https://git.eeqj.de/sneak/chat/schema/numerics/482.json",
+  "title": "482 ERR_CHANOPRIVSNEEDED",
+  "description": "You're not channel operator. RFC 1459 \u00a76.1.",
+  "$ref": "../message.json",
+  "properties": {
+    "command": {
+      "const": "482"
+    },
+    "to": {
+      "type": "string"
+    },
+    "params": {
+      "type": "array",
+      "items": {
+        "type": "string"
+      },
+      "description": "[channel]."
+    },
+    "body": {
+      "type": "array",
+      "items": {
+        "type": "string"
+      },
+      "description": "You're not channel operator",
+      "maxItems": 1
+    }
+  },
+  "required": [
+    "command",
+    "to",
+    "params"
+  ]
+}

web/build.sh

@@ -0,0 +1,41 @@
+#!/bin/sh
+set -e
+cd "$(dirname "$0")"
+
+# Install esbuild if not present
+if ! command -v esbuild >/dev/null 2>&1; then
+  if command -v npx >/dev/null 2>&1; then
+    NPX="npx"
+  else
+    echo "esbuild not found. Install it: npm install -g esbuild"
+    exit 1
+  fi
+else
+  NPX=""
+fi
+
+mkdir -p dist
+
+# Build JS bundle
+${NPX:+$NPX} esbuild src/app.jsx \
+  --bundle \
+  --minify \
+  --jsx-factory=h \
+  --jsx-fragment=Fragment \
+  --define:process.env.NODE_ENV=\"production\" \
+  --external:preact \
+  --outfile=dist/app.js \
+  2>/dev/null || \
+${NPX:+$NPX} esbuild src/app.jsx \
+  --bundle \
+  --minify \
+  --jsx-factory=h \
+  --jsx-fragment=Fragment \
+  --define:process.env.NODE_ENV=\"production\" \
+  --outfile=dist/app.js
+
+# Copy static files
+cp src/index.html dist/index.html
+cp src/style.css dist/style.css
+
+echo "Build complete: web/dist/"

web/dist/app.js

@@ -0,0 +1,464 @@
+(()=>{
+// Minimal Preact-like runtime using raw DOM for simplicity and zero build step.
+// This replaces the previous Preact SPA with a vanilla JS implementation.
+
+const API = '/api/v1';
+let token = localStorage.getItem('chat_token');
+let myNick = '';
+let myUID = 0;
+let lastQueueID = 0;
+let pollController = null;
+let channels = []; // [{name, topic}]
+let activeTab = null; // '#channel' or 'nick' or 'server'
+let messages = {}; // target -> [{command,from,to,body,ts,system}]
+let unread = {}; // target -> count
+let members = {}; // '#channel' -> [{nick}]
+
+function $(sel, parent) { return (parent||document).querySelector(sel); }
+function $$(sel, parent) { return [...(parent||document).querySelectorAll(sel)]; }
+function el(tag, attrs, ...children) {
+  const e = document.createElement(tag);
+  if (attrs) Object.entries(attrs).forEach(([k,v]) => {
+    if (k === 'class') e.className = v;
+    else if (k.startsWith('on')) e.addEventListener(k.slice(2).toLowerCase(), v);
+    else if (k === 'style' && typeof v === 'object') Object.assign(e.style, v);
+    else e.setAttribute(k, v);
+  });
+  children.flat(Infinity).forEach(c => {
+    if (c == null) return;
+    e.appendChild(typeof c === 'string' ? document.createTextNode(c) : c);
+  });
+  return e;
+}
+
+async function api(path, opts = {}) {
+  const headers = {'Content-Type': 'application/json', ...(opts.headers||{})};
+  if (token) headers['Authorization'] = `Bearer ${token}`;
+  const resp = await fetch(API + path, {...opts, headers, signal: opts.signal});
+  const data = await resp.json().catch(() => null);
+  if (!resp.ok) throw {status: resp.status, data};
+  return data;
+}
+
+function nickColor(nick) {
+  let h = 0;
+  for (let i = 0; i < nick.length; i++) h = nick.charCodeAt(i) + ((h << 5) - h);
+  return `hsl(${Math.abs(h) % 360}, 70%, 65%)`;
+}
+
+function formatTime(ts) {
+  return new Date(ts).toLocaleTimeString([], {hour:'2-digit',minute:'2-digit',second:'2-digit'});
+}
+
+function addMessage(target, msg) {
+  if (!messages[target]) messages[target] = [];
+  messages[target].push(msg);
+  if (messages[target].length > 500) messages[target] = messages[target].slice(-400);
+  if (target !== activeTab) {
+    unread[target] = (unread[target] || 0) + 1;
+    renderTabs();
+  }
+  if (target === activeTab) renderMessages();
+}
+
+function addSystemMessage(target, text) {
+  addMessage(target, {command: 'SYSTEM', from: '*', body: [text], ts: new Date().toISOString(), system: true});
+}
+
+// --- Rendering ---
+
+function renderApp() {
+  const root = $('#root');
+  root.innerHTML = '';
+  root.appendChild(el('div', {class:'app'},
+    el('div', {class:'tab-bar', id:'tabs'}),
+    el('div', {class:'content'},
+      el('div', {class:'messages-pane'},
+        el('div', {class:'messages', id:'msg-list'}),
+        el('div', {class:'input-bar', id:'input-bar'},
+          el('input', {id:'msg-input', placeholder:'Message...', onKeydown: e => { if(e.key==='Enter') sendInput(); }}),
+          el('button', {onClick: sendInput}, 'Send')
+        )
+      ),
+      el('div', {class:'user-list', id:'user-list'})
+    )
+  ));
+  renderTabs();
+  renderMessages();
+  renderMembers();
+  $('#msg-input')?.focus();
+}
+
+function renderTabs() {
+  const container = $('#tabs');
+  if (!container) return;
+  container.innerHTML = '';
+
+  // Server tab
+  const serverTab = el('div', {class: `tab ${activeTab === 'server' ? 'active' : ''}`, onClick: () => switchTab('server')}, 'Server');
+  container.appendChild(serverTab);
+
+  // Channel tabs
+  channels.forEach(ch => {
+    const badge = unread[ch.name] ? ` (${unread[ch.name]})` : '';
+    const tab = el('div', {class: `tab ${activeTab === ch.name ? 'active' : ''}`},
+      el('span', {onClick: () => switchTab(ch.name)}, ch.name + badge),
+      el('span', {class:'close-btn', onClick: (e) => { e.stopPropagation(); partChannel(ch.name); }}, '×')
+    );
+    container.appendChild(tab);
+  });
+
+  // DM tabs
+  Object.keys(messages).filter(k => !k.startsWith('#') && k !== 'server').forEach(nick => {
+    const badge = unread[nick] ? ` (${unread[nick]})` : '';
+    const tab = el('div', {class: `tab ${activeTab === nick ? 'active' : ''}`},
+      el('span', {onClick: () => switchTab(nick)}, '→' + nick + badge),
+      el('span', {class:'close-btn', onClick: (e) => { e.stopPropagation(); delete messages[nick]; delete unread[nick]; if(activeTab===nick) switchTab('server'); else renderTabs(); }}, '×')
+    );
+    container.appendChild(tab);
+  });
+
+  // Join input
+  const joinDiv = el('div', {class:'join-dialog'},
+    el('input', {id:'join-input', placeholder:'#channel', onKeydown: e => { if(e.key==='Enter') joinFromInput(); }}),
+    el('button', {onClick: joinFromInput}, 'Join')
+  );
+  container.appendChild(joinDiv);
+}
+
+function renderMessages() {
+  const container = $('#msg-list');
+  if (!container) return;
+  const msgs = messages[activeTab] || [];
+  container.innerHTML = '';
+  msgs.forEach(m => {
+    const isSystem = m.system || ['JOIN','PART','QUIT','NICK','TOPIC'].includes(m.command);
+    const bodyText = Array.isArray(m.body) ? m.body.join('\n') : (m.body || '');
+
+    let displayText = bodyText;
+    if (m.command === 'JOIN') displayText = `${m.from} has joined ${m.to}`;
+    else if (m.command === 'PART') displayText = `${m.from} has left ${m.to}` + (bodyText ? ` (${bodyText})` : '');
+    else if (m.command === 'QUIT') displayText = `${m.from} has quit` + (bodyText ? ` (${bodyText})` : '');
+    else if (m.command === 'NICK') displayText = `${m.from} is now known as ${bodyText}`;
+    else if (m.command === 'TOPIC') displayText = `${m.from} set topic: ${bodyText}`;
+
+    const msgEl = el('div', {class: `message ${isSystem ? 'system' : ''}`},
+      el('span', {class:'timestamp'}, m.ts ? formatTime(m.ts) : ''),
+      isSystem
+        ? el('span', {class:'nick'}, '*')
+        : el('span', {class:'nick', style:{color: nickColor(m.from)}}, m.from),
+      el('span', {class:'content'}, displayText)
+    );
+    container.appendChild(msgEl);
+  });
+  container.scrollTop = container.scrollHeight;
+}
+
+function renderMembers() {
+  const container = $('#user-list');
+  if (!container) return;
+  if (!activeTab || !activeTab.startsWith('#')) {
+    container.innerHTML = '';
+    return;
+  }
+  const mems = members[activeTab] || [];
+  container.innerHTML = '';
+  container.appendChild(el('h3', null, `Users (${mems.length})`));
+  mems.forEach(m => {
+    container.appendChild(el('div', {class:'user', style:{color: nickColor(m.nick)}, onClick: () => openDM(m.nick)}, m.nick));
+  });
+}
+
+function switchTab(target) {
+  activeTab = target;
+  unread[target] = 0;
+  renderTabs();
+  renderMessages();
+  renderMembers();
+  if (activeTab?.startsWith('#')) fetchMembers(activeTab);
+  $('#msg-input')?.focus();
+}
+
+// --- Actions ---
+
+async function joinFromInput() {
+  const input = $('#join-input');
+  if (!input) return;
+  let name = input.value.trim();
+  if (!name) return;
+  if (!name.startsWith('#')) name = '#' + name;
+  input.value = '';
+  try {
+    await api('/messages', {method:'POST', body: JSON.stringify({command:'JOIN', to: name})});
+  } catch(e) {
+    addSystemMessage('server', `Failed to join ${name}: ${e.data?.error || 'error'}`);
+  }
+}
+
+async function partChannel(name) {
+  try {
+    await api('/messages', {method:'POST', body: JSON.stringify({command:'PART', to: name})});
+  } catch(e) {}
+  channels = channels.filter(c => c.name !== name);
+  delete members[name];
+  if (activeTab === name) switchTab('server');
+  else renderTabs();
+}
+
+function openDM(nick) {
+  if (nick === myNick) return;
+  if (!messages[nick]) messages[nick] = [];
+  switchTab(nick);
+}
+
+async function sendInput() {
+  const input = $('#msg-input');
+  if (!input) return;
+  const text = input.value.trim();
+  if (!text) return;
+  input.value = '';
+
+  if (text.startsWith('/')) {
+    const parts = text.split(' ');
+    const cmd = parts[0].toLowerCase();
+    if (cmd === '/join' && parts[1]) { $('#join-input').value = parts[1]; joinFromInput(); return; }
+    if (cmd === '/part') { if(activeTab?.startsWith('#')) partChannel(activeTab); return; }
+    if (cmd === '/nick' && parts[1]) {
+      try {
+        await api('/messages', {method:'POST', body: JSON.stringify({command:'NICK', body:[parts[1]]})});
+      } catch(e) {
+        addSystemMessage(activeTab||'server', `Nick change failed: ${e.data?.error || 'error'}`);
+      }
+      return;
+    }
+    if (cmd === '/msg' && parts[1] && parts.slice(2).join(' ')) {
+      const target = parts[1];
+      const msg = parts.slice(2).join(' ');
+      try {
+        await api('/messages', {method:'POST', body: JSON.stringify({command:'PRIVMSG', to: target, body:[msg]})});
+        openDM(target);
+      } catch(e) {
+        addSystemMessage(activeTab||'server', `DM failed: ${e.data?.error || 'error'}`);
+      }
+      return;
+    }
+    if (cmd === '/quit') {
+      try { await api('/messages', {method:'POST', body: JSON.stringify({command:'QUIT'})}); } catch(e) {}
+      localStorage.removeItem('chat_token');
+      location.reload();
+      return;
+    }
+    addSystemMessage(activeTab||'server', `Unknown command: ${cmd}`);
+    return;
+  }
+
+  if (!activeTab || activeTab === 'server') {
+    addSystemMessage('server', 'Select a channel or user to send messages');
+    return;
+  }
+
+  try {
+    await api('/messages', {method:'POST', body: JSON.stringify({command:'PRIVMSG', to: activeTab, body:[text]})});
+  } catch(e) {
+    addSystemMessage(activeTab, `Send failed: ${e.data?.error || 'error'}`);
+  }
+}
+
+async function fetchMembers(channel) {
+  try {
+    const name = channel.replace('#','');
+    const data = await api(`/channels/${name}/members`);
+    members[channel] = data;
+    renderMembers();
+  } catch(e) {}
+}
+
+// --- Polling ---
+
+async function pollLoop() {
+  while (true) {
+    try {
+      if (pollController) pollController.abort();
+      pollController = new AbortController();
+      const data = await api(`/messages?after=${lastQueueID}&timeout=15`, {signal: pollController.signal});
+      if (data.last_id) lastQueueID = data.last_id;
+
+      for (const msg of (data.messages || [])) {
+        handleMessage(msg);
+      }
+    } catch(e) {
+      if (e instanceof DOMException && e.name === 'AbortError') continue;
+      if (e.status === 401) {
+        localStorage.removeItem('chat_token');
+        location.reload();
+        return;
+      }
+      await new Promise(r => setTimeout(r, 2000));
+    }
+  }
+}
+
+function handleMessage(msg) {
+  const body = Array.isArray(msg.body) ? msg.body : [];
+  const bodyText = body.join('\n');
+
+  switch (msg.command) {
+    case 'PRIVMSG':
+    case 'NOTICE': {
+      let target = msg.to;
+      // DM: if it's to me, show under sender's nick tab
+      if (!target.startsWith('#')) {
+        target = msg.from === myNick ? msg.to : msg.from;
+        if (!messages[target]) messages[target] = [];
+      }
+      addMessage(target, msg);
+      break;
+    }
+    case 'JOIN': {
+      addMessage(msg.to, msg);
+      if (msg.from === myNick) {
+        // We joined a channel
+        if (!channels.find(c => c.name === msg.to)) {
+          channels.push({name: msg.to, topic: ''});
+        }
+        switchTab(msg.to);
+        fetchMembers(msg.to);
+      } else if (activeTab === msg.to) {
+        fetchMembers(msg.to);
+      }
+      break;
+    }
+    case 'PART': {
+      addMessage(msg.to, msg);
+      if (msg.from === myNick) {
+        channels = channels.filter(c => c.name !== msg.to);
+        if (activeTab === msg.to) switchTab('server');
+        else renderTabs();
+      } else if (activeTab === msg.to) {
+        fetchMembers(msg.to);
+      }
+      break;
+    }
+    case 'QUIT': {
+      // Show in all channels where this user might be
+      channels.forEach(ch => {
+        addMessage(ch.name, msg);
+      });
+      break;
+    }
+    case 'NICK': {
+      const newNick = body[0] || '';
+      if (msg.from === myNick) {
+        myNick = newNick;
+        addSystemMessage(activeTab || 'server', `You are now known as ${newNick}`);
+      } else {
+        channels.forEach(ch => {
+          addMessage(ch.name, msg);
+        });
+      }
+      break;
+    }
+    case 'TOPIC': {
+      addMessage(msg.to, msg);
+      const ch = channels.find(c => c.name === msg.to);
+      if (ch) ch.topic = bodyText;
+      break;
+    }
+    default:
+      addSystemMessage('server', `[${msg.command}] ${bodyText}`);
+  }
+}
+
+// --- Login ---
+
+function renderLogin() {
+  const root = $('#root');
+  root.innerHTML = '';
+
+  let serverName = 'Chat';
+  let motd = '';
+
+  api('/server').then(data => {
+    if (data.name) { serverName = data.name; $('h1', root).textContent = serverName; }
+    if (data.motd) { motd = data.motd; const m = $('.motd', root); if(m) m.textContent = motd; }
+  }).catch(() => {});
+
+  const form = el('form', {class:'login-screen', onSubmit: async (e) => {
+    e.preventDefault();
+    const nick = $('input', form).value.trim();
+    if (!nick) return;
+    const errEl = $('.error', form);
+    if (errEl) errEl.textContent = '';
+    try {
+      const data = await api('/session', {method:'POST', body: JSON.stringify({nick})});
+      token = data.token;
+      myNick = data.nick;
+      myUID = data.id;
+      localStorage.setItem('chat_token', token);
+      startApp();
+    } catch(err) {
+      const errEl = $('.error', form) || form.appendChild(el('div', {class:'error'}));
+      errEl.textContent = err.data?.error || 'Connection failed';
+    }
+  }},
+    el('h1', null, serverName),
+    motd ? el('div', {class:'motd'}, motd) : null,
+    el('input', {type:'text', placeholder:'Choose a nickname...', maxLength:'32', autofocus:'true'}),
+    el('button', {type:'submit'}, 'Connect'),
+    el('div', {class:'error'})
+  );
+  root.appendChild(form);
+  $('input', form)?.focus();
+}
+
+async function startApp() {
+  messages = {server: []};
+  unread = {};
+  channels = [];
+  activeTab = 'server';
+  lastQueueID = 0;
+
+  addSystemMessage('server', `Connected as ${myNick}`);
+
+  // Fetch server info
+  try {
+    const info = await api('/server');
+    if (info.motd) addSystemMessage('server', `MOTD: ${info.motd}`);
+  } catch(e) {}
+
+  // Fetch current state (channels we're already in)
+  try {
+    const state = await api('/state');
+    myNick = state.nick;
+    myUID = state.id;
+    if (state.channels) {
+      state.channels.forEach(ch => {
+        channels.push({name: ch.name, topic: ch.topic});
+        if (!messages[ch.name]) messages[ch.name] = [];
+      });
+      if (channels.length > 0) switchTab(channels[0].name);
+    }
+  } catch(e) {}
+
+  renderApp();
+  pollLoop();
+}
+
+// --- Init ---
+
+if (token) {
+  // Try to resume session
+  api('/state').then(data => {
+    myNick = data.nick;
+    myUID = data.id;
+    startApp();
+  }).catch(() => {
+    localStorage.removeItem('chat_token');
+    token = null;
+    renderLogin();
+  });
+} else {
+  renderLogin();
+}
+
+})();

web/dist/index.html

@@ -0,0 +1,13 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="UTF-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <title>Chat</title>
+  <link rel="stylesheet" href="/style.css">
+</head>
+<body>
+  <div id="root"></div>
+  <script src="/app.js"></script>
+</body>
+</html>

web/dist/style.css

@@ -0,0 +1,274 @@
+* { margin: 0; padding: 0; box-sizing: border-box; }
+
+:root {
+  --bg: #1a1a2e;
+  --bg-secondary: #16213e;
+  --bg-input: #0f3460;
+  --text: #e0e0e0;
+  --text-muted: #888;
+  --accent: #e94560;
+  --accent2: #0f3460;
+  --border: #2a2a4a;
+  --nick: #53a8b6;
+  --timestamp: #666;
+  --tab-active: #e94560;
+  --tab-bg: #16213e;
+  --tab-hover: #1a1a3e;
+}
+
+html, body, #root {
+  height: 100%;
+  font-family: 'Courier New', Courier, monospace;
+  font-size: 14px;
+  background: var(--bg);
+  color: var(--text);
+}
+
+/* Login screen */
+.login-screen {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  justify-content: center;
+  height: 100%;
+  gap: 16px;
+}
+
+.login-screen h1 {
+  color: var(--accent);
+  font-size: 2em;
+}
+
+.login-screen input {
+  padding: 10px 16px;
+  font-size: 16px;
+  font-family: inherit;
+  background: var(--bg-input);
+  border: 1px solid var(--border);
+  color: var(--text);
+  border-radius: 4px;
+  width: 280px;
+}
+
+.login-screen button {
+  padding: 10px 24px;
+  font-size: 16px;
+  font-family: inherit;
+  background: var(--accent);
+  border: none;
+  color: white;
+  border-radius: 4px;
+  cursor: pointer;
+}
+
+.login-screen .error {
+  color: var(--accent);
+}
+
+.login-screen .motd {
+  color: var(--text-muted);
+  max-width: 400px;
+  text-align: center;
+  white-space: pre-wrap;
+}
+
+/* Main layout */
+.app {
+  display: flex;
+  flex-direction: column;
+  height: 100%;
+}
+
+/* Tab bar */
+.tab-bar {
+  display: flex;
+  background: var(--bg-secondary);
+  border-bottom: 1px solid var(--border);
+  overflow-x: auto;
+  flex-shrink: 0;
+}
+
+.tab {
+  padding: 8px 16px;
+  cursor: pointer;
+  border-bottom: 2px solid transparent;
+  white-space: nowrap;
+  color: var(--text-muted);
+  user-select: none;
+}
+
+.tab:hover {
+  background: var(--tab-hover);
+}
+
+.tab.active {
+  color: var(--text);
+  border-bottom-color: var(--tab-active);
+}
+
+.tab .close-btn {
+  margin-left: 8px;
+  color: var(--text-muted);
+  font-size: 12px;
+}
+
+.tab .close-btn:hover {
+  color: var(--accent);
+}
+
+/* Content area */
+.content {
+  display: flex;
+  flex: 1;
+  overflow: hidden;
+}
+
+/* Messages */
+.messages-pane {
+  flex: 1;
+  display: flex;
+  flex-direction: column;
+  overflow: hidden;
+}
+
+.messages {
+  flex: 1;
+  overflow-y: auto;
+  padding: 8px 12px;
+}
+
+.message {
+  padding: 2px 0;
+  line-height: 1.4;
+  word-wrap: break-word;
+}
+
+.message .timestamp {
+  color: var(--timestamp);
+  font-size: 12px;
+  margin-right: 8px;
+}
+
+.message .nick {
+  color: var(--nick);
+  font-weight: bold;
+  margin-right: 8px;
+}
+
+.message .nick::before { content: '<'; }
+.message .nick::after { content: '>'; }
+
+.message.system {
+  color: var(--text-muted);
+  font-style: italic;
+}
+
+.message.system .nick {
+  color: var(--text-muted);
+}
+
+.message.system .nick::before,
+.message.system .nick::after { content: ''; }
+
+/* Input */
+.input-bar {
+  display: flex;
+  border-top: 1px solid var(--border);
+  background: var(--bg-secondary);
+  flex-shrink: 0;
+}
+
+.input-bar input {
+  flex: 1;
+  padding: 10px 12px;
+  font-family: inherit;
+  font-size: 14px;
+  background: var(--bg-input);
+  border: none;
+  color: var(--text);
+  outline: none;
+}
+
+.input-bar button {
+  padding: 10px 16px;
+  font-family: inherit;
+  background: var(--accent);
+  border: none;
+  color: white;
+  cursor: pointer;
+}
+
+/* User list */
+.user-list {
+  width: 160px;
+  background: var(--bg-secondary);
+  border-left: 1px solid var(--border);
+  overflow-y: auto;
+  padding: 8px;
+  flex-shrink: 0;
+}
+
+.user-list h3 {
+  color: var(--text-muted);
+  font-size: 11px;
+  text-transform: uppercase;
+  margin-bottom: 8px;
+  letter-spacing: 1px;
+}
+
+.user-list .user {
+  padding: 3px 4px;
+  color: var(--nick);
+  font-size: 13px;
+  cursor: pointer;
+}
+
+.user-list .user:hover {
+  background: var(--tab-hover);
+}
+
+/* Server tab */
+.server-messages {
+  color: var(--text-muted);
+  padding: 12px;
+  white-space: pre-wrap;
+  overflow-y: auto;
+  flex: 1;
+}
+
+/* Channel join dialog */
+.join-dialog {
+  padding: 12px;
+  display: flex;
+  gap: 8px;
+  background: var(--bg-secondary);
+  border-bottom: 1px solid var(--border);
+}
+
+.join-dialog input {
+  padding: 6px 10px;
+  font-family: inherit;
+  font-size: 13px;
+  background: var(--bg-input);
+  border: 1px solid var(--border);
+  color: var(--text);
+  border-radius: 3px;
+  width: 200px;
+}
+
+.join-dialog button {
+  padding: 6px 14px;
+  font-family: inherit;
+  font-size: 13px;
+  background: var(--accent2);
+  border: none;
+  color: var(--text);
+  border-radius: 3px;
+  cursor: pointer;
+}
+
+/* Responsive */
+@media (max-width: 600px) {
+  .user-list { display: none; }
+  .tab { padding: 6px 10px; font-size: 13px; }
+}

web/embed.go

@@ -0,0 +1,9 @@
+// Package web embeds the built SPA static files.
+package web
+
+import "embed"
+
+// Dist contains the built web client files.
+//
+//go:embed dist/*
+var Dist embed.FS

web/package-lock.json

@@ -0,0 +1,513 @@
+{
+  "name": "web",
+  "version": "1.0.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "web",
+      "version": "1.0.0",
+      "license": "ISC",
+      "dependencies": {
+        "preact": "^10.28.3"
+      },
+      "devDependencies": {
+        "esbuild": "^0.27.3"
+      }
+    },
+    "node_modules/@esbuild/aix-ppc64": {
+      "version": "0.27.3",
+      "resolved": "https://registry.npmjs.org/@esbuild/aix-ppc64/-/aix-ppc64-0.27.3.tgz",
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+      "cpu": [
+        "ppc64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "aix"
+      ],
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@esbuild/android-arm": {
+      "version": "0.27.3",
+      "resolved": "https://registry.npmjs.org/@esbuild/android-arm/-/android-arm-0.27.3.tgz",
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+      "cpu": [
+        "arm"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "android"
+      ],
+      "engines": {
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+      }
+    },
+    "node_modules/@esbuild/android-arm64": {
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+        "arm64"
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+    },
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+      "license": "MIT",
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+        "android"
+      ],
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+      }
+    },
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+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "darwin"
+      ],
+      "engines": {
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+      }
+    },
+    "node_modules/@esbuild/darwin-x64": {
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+      ],
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+    },
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+        "arm64"
+      ],
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+      "license": "MIT",
+      "optional": true,
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+        "freebsd"
+      ],
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+      }
+    },
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+        "x64"
+      ],
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+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "freebsd"
+      ],
+      "engines": {
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+      }
+    },
+    "node_modules/@esbuild/linux-arm": {
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+        "arm"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
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+        "linux"
+      ],
+      "engines": {
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+      }
+    },
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+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "linux"
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+      "license": "MIT",
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+  }
+}

web/package.json

@@ -0,0 +1,18 @@
+{
+  "name": "web",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "devDependencies": {
+    "esbuild": "^0.27.3"
+  },
+  "dependencies": {
+    "preact": "^10.28.3"
+  }
+}

web/src/app.jsx

@@ -0,0 +1,371 @@
+import { h, render, Component } from 'preact';
+import { useState, useEffect, useRef, useCallback } from 'preact/hooks';
+
+const API = '/api/v1';
+
+function api(path, opts = {}) {
+  const token = localStorage.getItem('chat_token');
+  const headers = { 'Content-Type': 'application/json', ...(opts.headers || {}) };
+  if (token) headers['Authorization'] = `Bearer ${token}`;
+  return fetch(API + path, { ...opts, headers }).then(async r => {
+    const data = await r.json().catch(() => null);
+    if (!r.ok) throw { status: r.status, data };
+    return data;
+  });
+}
+
+function formatTime(ts) {
+  const d = new Date(ts);
+  return d.toLocaleTimeString([], { hour: '2-digit', minute: '2-digit', second: '2-digit' });
+}
+
+// Nick color hashing
+function nickColor(nick) {
+  let h = 0;
+  for (let i = 0; i < nick.length; i++) h = nick.charCodeAt(i) + ((h << 5) - h);
+  const hue = Math.abs(h) % 360;
+  return `hsl(${hue}, 70%, 65%)`;
+}
+
+function LoginScreen({ onLogin }) {
+  const [nick, setNick] = useState('');
+  const [error, setError] = useState('');
+  const [motd, setMotd] = useState('');
+  const [serverName, setServerName] = useState('Chat');
+  const inputRef = useRef();
+
+  useEffect(() => {
+    api('/server').then(s => {
+      if (s.name) setServerName(s.name);
+      if (s.motd) setMotd(s.motd);
+    }).catch(() => {});
+    // Check for saved token
+    const saved = localStorage.getItem('chat_token');
+    if (saved) {
+      api('/state').then(u => onLogin(u.nick, saved)).catch(() => localStorage.removeItem('chat_token'));
+    }
+    inputRef.current?.focus();
+  }, []);
+
+  const submit = async (e) => {
+    e.preventDefault();
+    setError('');
+    try {
+      const res = await api('/session', {
+        method: 'POST',
+        body: JSON.stringify({ nick: nick.trim() })
+      });
+      localStorage.setItem('chat_token', res.token);
+      onLogin(res.nick, res.token);
+    } catch (err) {
+      setError(err.data?.error || 'Connection failed');
+    }
+  };
+
+  return (
+    <div class="login-screen">
+      <h1>{serverName}</h1>
+      {motd && <div class="motd">{motd}</div>}
+      <form onSubmit={submit}>
+        <input
+          ref={inputRef}
+          type="text"
+          placeholder="Choose a nickname..."
+          value={nick}
+          onInput={e => setNick(e.target.value)}
+          maxLength={32}
+          autoFocus
+        />
+        <button type="submit">Connect</button>
+      </form>
+      {error && <div class="error">{error}</div>}
+    </div>
+  );
+}
+
+function Message({ msg }) {
+  return (
+    <div class={`message ${msg.system ? 'system' : ''}`}>
+      <span class="timestamp">{formatTime(msg.createdAt)}</span>
+      <span class="nick" style={{ color: msg.system ? undefined : nickColor(msg.nick) }}>{msg.nick}</span>
+      <span class="content">{msg.content}</span>
+    </div>
+  );
+}
+
+function App() {
+  const [loggedIn, setLoggedIn] = useState(false);
+  const [nick, setNick] = useState('');
+  const [tabs, setTabs] = useState([{ type: 'server', name: 'Server' }]);
+  const [activeTab, setActiveTab] = useState(0);
+  const [messages, setMessages] = useState({ server: [] }); // keyed by tab name
+  const [members, setMembers] = useState({}); // keyed by channel name
+  const [input, setInput] = useState('');
+  const [joinInput, setJoinInput] = useState('');
+  const [lastMsgId, setLastMsgId] = useState(0);
+  const messagesEndRef = useRef();
+  const inputRef = useRef();
+  const pollRef = useRef();
+
+  const addMessage = useCallback((tabName, msg) => {
+    setMessages(prev => ({
+      ...prev,
+      [tabName]: [...(prev[tabName] || []), msg]
+    }));
+  }, []);
+
+  const addSystemMessage = useCallback((tabName, text) => {
+    addMessage(tabName, {
+      id: Date.now(),
+      nick: '*',
+      content: text,
+      createdAt: new Date().toISOString(),
+      system: true
+    });
+  }, [addMessage]);
+
+  const onLogin = useCallback((userNick, token) => {
+    setNick(userNick);
+    setLoggedIn(true);
+    addSystemMessage('server', `Connected as ${userNick}`);
+    // Fetch server info
+    api('/server').then(s => {
+      if (s.motd) addSystemMessage('server', `MOTD: ${s.motd}`);
+    }).catch(() => {});
+  }, [addSystemMessage]);
+
+  // Poll for new messages
+  useEffect(() => {
+    if (!loggedIn) return;
+    let alive = true;
+    const poll = async () => {
+      try {
+        const msgs = await api(`/messages?after=${lastMsgId}`);
+        if (!alive) return;
+        let maxId = lastMsgId;
+        for (const msg of msgs) {
+          if (msg.id > maxId) maxId = msg.id;
+          if (msg.isDm) {
+            const dmTab = msg.nick === nick ? msg.dmTarget : msg.nick;
+            // Ensure DM tab exists
+            setTabs(prev => {
+              if (!prev.find(t => t.type === 'dm' && t.name === dmTab)) {
+                return [...prev, { type: 'dm', name: dmTab }];
+              }
+              return prev;
+            });
+            addMessage(dmTab, msg);
+          } else if (msg.channel) {
+            addMessage(msg.channel, msg);
+          }
+        }
+        if (maxId > lastMsgId) setLastMsgId(maxId);
+      } catch (err) {
+        // silent
+      }
+    };
+    pollRef.current = setInterval(poll, 1500);
+    poll();
+    return () => { alive = false; clearInterval(pollRef.current); };
+  }, [loggedIn, lastMsgId, nick, addMessage]);
+
+  // Fetch members for active channel tab
+  useEffect(() => {
+    if (!loggedIn) return;
+    const tab = tabs[activeTab];
+    if (!tab || tab.type !== 'channel') return;
+    const chName = tab.name.replace('#', '');
+    api(`/channels/${chName}/members`).then(m => {
+      setMembers(prev => ({ ...prev, [tab.name]: m }));
+    }).catch(() => {});
+    const iv = setInterval(() => {
+      api(`/channels/${chName}/members`).then(m => {
+        setMembers(prev => ({ ...prev, [tab.name]: m }));
+      }).catch(() => {});
+    }, 5000);
+    return () => clearInterval(iv);
+  }, [loggedIn, activeTab, tabs]);
+
+  // Auto-scroll
+  useEffect(() => {
+    messagesEndRef.current?.scrollIntoView({ behavior: 'smooth' });
+  }, [messages, activeTab]);
+
+  // Focus input on tab change
+  useEffect(() => {
+    inputRef.current?.focus();
+  }, [activeTab]);
+
+  const joinChannel = async (name) => {
+    if (!name) return;
+    name = name.trim();
+    if (!name.startsWith('#')) name = '#' + name;
+    try {
+      await api('/messages', { method: 'POST', body: JSON.stringify({ command: 'JOIN', to: name }) });
+      setTabs(prev => {
+        if (prev.find(t => t.type === 'channel' && t.name === name)) return prev;
+        return [...prev, { type: 'channel', name }];
+      });
+      setActiveTab(tabs.length); // switch to new tab
+      addSystemMessage(name, `Joined ${name}`);
+      setJoinInput('');
+    } catch (err) {
+      addSystemMessage('server', `Failed to join ${name}: ${err.data?.error || 'error'}`);
+    }
+  };
+
+  const partChannel = async (name) => {
+    try {
+      await api('/messages', { method: 'POST', body: JSON.stringify({ command: 'PART', to: name }) });
+    } catch (err) { /* ignore */ }
+    setTabs(prev => {
+      const next = prev.filter(t => !(t.type === 'channel' && t.name === name));
+      return next;
+    });
+    setActiveTab(0);
+  };
+
+  const closeTab = (idx) => {
+    const tab = tabs[idx];
+    if (tab.type === 'channel') {
+      partChannel(tab.name);
+    } else if (tab.type === 'dm') {
+      setTabs(prev => prev.filter((_, i) => i !== idx));
+      if (activeTab >= idx) setActiveTab(Math.max(0, activeTab - 1));
+    }
+  };
+
+  const openDM = (targetNick) => {
+    setTabs(prev => {
+      if (prev.find(t => t.type === 'dm' && t.name === targetNick)) return prev;
+      return [...prev, { type: 'dm', name: targetNick }];
+    });
+    setActiveTab(tabs.findIndex(t => t.type === 'dm' && t.name === targetNick) || tabs.length);
+  };
+
+  const sendMessage = async () => {
+    const text = input.trim();
+    if (!text) return;
+    setInput('');
+    const tab = tabs[activeTab];
+    if (!tab || tab.type === 'server') return;
+
+    // Handle /commands
+    if (text.startsWith('/')) {
+      const parts = text.split(' ');
+      const cmd = parts[0].toLowerCase();
+      if (cmd === '/join' && parts[1]) {
+        joinChannel(parts[1]);
+        return;
+      }
+      if (cmd === '/part') {
+        if (tab.type === 'channel') partChannel(tab.name);
+        return;
+      }
+      if (cmd === '/msg' && parts[1] && parts.slice(2).join(' ')) {
+        const target = parts[1];
+        const msg = parts.slice(2).join(' ');
+        try {
+          await api('/messages', { method: 'POST', body: JSON.stringify({ command: 'PRIVMSG', to: target, body: [msg] }) });
+          openDM(target);
+        } catch (err) {
+          addSystemMessage('server', `Failed to send DM: ${err.data?.error || 'error'}`);
+        }
+        return;
+      }
+      if (cmd === '/nick' && parts[1]) {
+        try {
+          await api('/messages', { method: 'POST', body: JSON.stringify({ command: 'NICK', body: [parts[1]] }) });
+          setNick(parts[1]);
+          addSystemMessage('server', `Nick changed to ${parts[1]}`);
+        } catch (err) {
+          addSystemMessage('server', `Nick change failed: ${err.data?.error || 'error'}`);
+        }
+        return;
+      }
+      addSystemMessage('server', `Unknown command: ${cmd}`);
+      return;
+    }
+
+    const to = tab.type === 'channel' ? tab.name : tab.name;
+    try {
+      await api('/messages', { method: 'POST', body: JSON.stringify({ command: 'PRIVMSG', to, body: [text] }) });
+    } catch (err) {
+      addSystemMessage(tab.name, `Send failed: ${err.data?.error || 'error'}`);
+    }
+  };
+
+  if (!loggedIn) return <LoginScreen onLogin={onLogin} />;
+
+  const currentTab = tabs[activeTab] || tabs[0];
+  const currentMessages = messages[currentTab.name] || [];
+  const currentMembers = members[currentTab.name] || [];
+
+  return (
+    <div class="app">
+      <div class="tab-bar">
+        {tabs.map((tab, i) => (
+          <div
+            class={`tab ${i === activeTab ? 'active' : ''}`}
+            onClick={() => setActiveTab(i)}
+          >
+            {tab.type === 'dm' ? `→${tab.name}` : tab.name}
+            {tab.type !== 'server' && (
+              <span class="close-btn" onClick={(e) => { e.stopPropagation(); closeTab(i); }}>×</span>
+            )}
+          </div>
+        ))}
+        <div class="join-dialog">
+          <input
+            placeholder="#channel"
+            value={joinInput}
+            onInput={e => setJoinInput(e.target.value)}
+            onKeyDown={e => e.key === 'Enter' && joinChannel(joinInput)}
+          />
+          <button onClick={() => joinChannel(joinInput)}>Join</button>
+        </div>
+      </div>
+
+      <div class="content">
+        <div class="messages-pane">
+          {currentTab.type === 'server' ? (
+            <div class="server-messages">
+              {currentMessages.map(m => <Message msg={m} />)}
+              <div ref={messagesEndRef} />
+            </div>
+          ) : (
+            <>
+              <div class="messages">
+                {currentMessages.map(m => <Message msg={m} />)}
+                <div ref={messagesEndRef} />
+              </div>
+              <div class="input-bar">
+                <input
+                  ref={inputRef}
+                  placeholder={`Message ${currentTab.name}...`}
+                  value={input}
+                  onInput={e => setInput(e.target.value)}
+                  onKeyDown={e => e.key === 'Enter' && sendMessage()}
+                />
+                <button onClick={sendMessage}>Send</button>
+              </div>
+            </>
+          )}
+        </div>
+
+        {currentTab.type === 'channel' && (
+          <div class="user-list">
+            <h3>Users ({currentMembers.length})</h3>
+            {currentMembers.map(u => (
+              <div class="user" onClick={() => openDM(u.nick)} style={{ color: nickColor(u.nick) }}>
+                {u.nick}
+              </div>
+            ))}
+          </div>
+        )}
+      </div>
+    </div>
+  );
+}
+
+render(<App />, document.getElementById('root'));

web/src/index.html

@@ -0,0 +1,13 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="UTF-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <title>Chat</title>
+  <link rel="stylesheet" href="/style.css">
+</head>
+<body>
+  <div id="root"></div>
+  <script src="/app.js"></script>
+</body>
+</html>

web/src/style.css

@@ -0,0 +1,274 @@
+* { margin: 0; padding: 0; box-sizing: border-box; }
+
+:root {
+  --bg: #1a1a2e;
+  --bg-secondary: #16213e;
+  --bg-input: #0f3460;
+  --text: #e0e0e0;
+  --text-muted: #888;
+  --accent: #e94560;
+  --accent2: #0f3460;
+  --border: #2a2a4a;
+  --nick: #53a8b6;
+  --timestamp: #666;
+  --tab-active: #e94560;
+  --tab-bg: #16213e;
+  --tab-hover: #1a1a3e;
+}
+
+html, body, #root {
+  height: 100%;
+  font-family: 'Courier New', Courier, monospace;
+  font-size: 14px;
+  background: var(--bg);
+  color: var(--text);
+}
+
+/* Login screen */
+.login-screen {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  justify-content: center;
+  height: 100%;
+  gap: 16px;
+}
+
+.login-screen h1 {
+  color: var(--accent);
+  font-size: 2em;
+}
+
+.login-screen input {
+  padding: 10px 16px;
+  font-size: 16px;
+  font-family: inherit;
+  background: var(--bg-input);
+  border: 1px solid var(--border);
+  color: var(--text);
+  border-radius: 4px;
+  width: 280px;
+}
+
+.login-screen button {
+  padding: 10px 24px;
+  font-size: 16px;
+  font-family: inherit;
+  background: var(--accent);
+  border: none;
+  color: white;
+  border-radius: 4px;
+  cursor: pointer;
+}
+
+.login-screen .error {
+  color: var(--accent);
+}
+
+.login-screen .motd {
+  color: var(--text-muted);
+  max-width: 400px;
+  text-align: center;
+  white-space: pre-wrap;
+}
+
+/* Main layout */
+.app {
+  display: flex;
+  flex-direction: column;
+  height: 100%;
+}
+
+/* Tab bar */
+.tab-bar {
+  display: flex;
+  background: var(--bg-secondary);
+  border-bottom: 1px solid var(--border);
+  overflow-x: auto;
+  flex-shrink: 0;
+}
+
+.tab {
+  padding: 8px 16px;
+  cursor: pointer;
+  border-bottom: 2px solid transparent;
+  white-space: nowrap;
+  color: var(--text-muted);
+  user-select: none;
+}
+
+.tab:hover {
+  background: var(--tab-hover);
+}
+
+.tab.active {
+  color: var(--text);
+  border-bottom-color: var(--tab-active);
+}
+
+.tab .close-btn {
+  margin-left: 8px;
+  color: var(--text-muted);
+  font-size: 12px;
+}
+
+.tab .close-btn:hover {
+  color: var(--accent);
+}
+
+/* Content area */
+.content {
+  display: flex;
+  flex: 1;
+  overflow: hidden;
+}
+
+/* Messages */
+.messages-pane {
+  flex: 1;
+  display: flex;
+  flex-direction: column;
+  overflow: hidden;
+}
+
+.messages {
+  flex: 1;
+  overflow-y: auto;
+  padding: 8px 12px;
+}
+
+.message {
+  padding: 2px 0;
+  line-height: 1.4;
+  word-wrap: break-word;
+}
+
+.message .timestamp {
+  color: var(--timestamp);
+  font-size: 12px;
+  margin-right: 8px;
+}
+
+.message .nick {
+  color: var(--nick);
+  font-weight: bold;
+  margin-right: 8px;
+}
+
+.message .nick::before { content: '<'; }
+.message .nick::after { content: '>'; }
+
+.message.system {
+  color: var(--text-muted);
+  font-style: italic;
+}
+
+.message.system .nick {
+  color: var(--text-muted);
+}
+
+.message.system .nick::before,
+.message.system .nick::after { content: ''; }
+
+/* Input */
+.input-bar {
+  display: flex;
+  border-top: 1px solid var(--border);
+  background: var(--bg-secondary);
+  flex-shrink: 0;
+}
+
+.input-bar input {
+  flex: 1;
+  padding: 10px 12px;
+  font-family: inherit;
+  font-size: 14px;
+  background: var(--bg-input);
+  border: none;
+  color: var(--text);
+  outline: none;
+}
+
+.input-bar button {
+  padding: 10px 16px;
+  font-family: inherit;
+  background: var(--accent);
+  border: none;
+  color: white;
+  cursor: pointer;
+}
+
+/* User list */
+.user-list {
+  width: 160px;
+  background: var(--bg-secondary);
+  border-left: 1px solid var(--border);
+  overflow-y: auto;
+  padding: 8px;
+  flex-shrink: 0;
+}
+
+.user-list h3 {
+  color: var(--text-muted);
+  font-size: 11px;
+  text-transform: uppercase;
+  margin-bottom: 8px;
+  letter-spacing: 1px;
+}
+
+.user-list .user {
+  padding: 3px 4px;
+  color: var(--nick);
+  font-size: 13px;
+  cursor: pointer;
+}
+
+.user-list .user:hover {
+  background: var(--tab-hover);
+}
+
+/* Server tab */
+.server-messages {
+  color: var(--text-muted);
+  padding: 12px;
+  white-space: pre-wrap;
+  overflow-y: auto;
+  flex: 1;
+}
+
+/* Channel join dialog */
+.join-dialog {
+  padding: 12px;
+  display: flex;
+  gap: 8px;
+  background: var(--bg-secondary);
+  border-bottom: 1px solid var(--border);
+}
+
+.join-dialog input {
+  padding: 6px 10px;
+  font-family: inherit;
+  font-size: 13px;
+  background: var(--bg-input);
+  border: 1px solid var(--border);
+  color: var(--text);
+  border-radius: 3px;
+  width: 200px;
+}
+
+.join-dialog button {
+  padding: 6px 14px;
+  font-family: inherit;
+  font-size: 13px;
+  background: var(--accent2);
+  border: none;
+  color: var(--text);
+  border-radius: 3px;
+  cursor: pointer;
+}
+
+/* Responsive */
+@media (max-width: 600px) {
+  .user-list { display: none; }
+  .tab { padding: 6px 10px; font-size: 13px; }
+}