docs: update README schema section to match actual database schema

Update the Schema section and related references throughout README.md to
accurately reflect the current 001_initial.sql migration:

- Rename 'users' table to 'sessions' with new columns: uuid, password_hash,
  signing_key, away_message
- Add new 'clients' table (uuid, session_id FK, token, created_at, last_seen)
- Add topic_set_by and topic_set_at columns to 'channels' table
- Update channel_members FK from user_id to session_id
- Add params column to messages table
- Update client_queues FK from user_id to client_id
- Update Queue Architecture diagram labels and surrounding text
- Update In-Memory Broker description to use client_id terminology
- Update Multi-Client Model MVP note to reflect sessions/clients split

Makefile

@@ -1,4 +1,4 @@
-.PHONY: all build lint fmt fmt-check test check clean run debug docker hooks ensure-web-dist
+.PHONY: all build lint fmt fmt-check test check clean run debug docker hooks
 
 BINARY := neoircd
 VERSION := $(shell git describe --tags --always --dirty 2>/dev/null || echo "dev")
@@ -7,21 +7,10 @@ LDFLAGS := -X main.Version=$(VERSION) -X main.Buildarch=$(BUILDARCH)
 
 all: check build
 
-# ensure-web-dist creates placeholder files so //go:embed dist/* in
-# web/embed.go resolves without a full Node.js build.  The real SPA is
-# built by the web-builder Docker stage; these placeholders let
-# "make test" and "make build" work outside Docker.
-ensure-web-dist:
-	@if [ ! -d web/dist ]; then \
-		mkdir -p web/dist && \
-		touch web/dist/index.html web/dist/style.css web/dist/app.js && \
-		echo "==> Created placeholder web/dist/ for go:embed"; \
-	fi
-
-build: ensure-web-dist
+build:
 	go build -ldflags "$(LDFLAGS)" -o bin/$(BINARY) ./cmd/neoircd
 
-lint: ensure-web-dist
+lint:
 	golangci-lint run --config .golangci.yml ./...
 
 fmt:
@@ -31,7 +20,7 @@ fmt:
 fmt-check:
 	@test -z "$$(gofmt -l .)" || (echo "Files not formatted:" && gofmt -l . && exit 1)
 
-test: ensure-web-dist
+test:
 	go test -timeout 30s -v -race -cover ./...
 
 # check runs all validation without making changes

README.md

@@ -115,7 +115,7 @@ Everything else is IRC. `PRIVMSG`, `JOIN`, `PART`, `NICK`, `TOPIC`, `MODE`,
 Joining a nonexistent channel creates it. Channels disappear when empty. Nicks
 are unique per server. Identity starts with a key — a nick is a display name.
 Accounts are optional: you can create an anonymous session instantly, or
-set a password via the PASS command for multi-client access to a single session.
+register with a password for multi-client access to a single session.
 
 ### On the resemblance to JSON-RPC
 
@@ -149,59 +149,63 @@ not arbitrary choices — each one follows from the project's core thesis that
 IRC's command model is correct and only the transport and session management
 need to change.
 
-### Identity & Sessions — Cookie-Based Authentication
+### Identity & Sessions — Dual Authentication Model
 
-The server uses **HTTP cookies** for all authentication. There is no separate
-registration step — sessions start anonymous and can optionally set a password
-for multi-client access.
+The server supports two authentication paths: **anonymous sessions** for
+instant access, and **optional account registration** for multi-client access.
 
-#### Session Creation
+#### Anonymous Sessions (No Account Required)
+
+The simplest entry point. No registration, no passwords.
 
 - **Session creation**: client sends `POST /api/v1/session` with a desired
-  nick → server sets an **HttpOnly auth cookie** (`neoirc_auth`) containing
-  a cryptographically random token (64 hex characters) and returns the user
-  ID and nick in the JSON response body. No token appears in the JSON body.
-- The auth cookie is HttpOnly, SameSite=Strict, and Secure when behind TLS.
-  Clients never need to handle the token directly — the browser/HTTP client
-  manages cookies automatically.
-- Sessions start anonymous — no password required. When the session expires
-  or the user QUITs, the nick is released.
+  nick → server assigns an **auth token** (64 hex characters of
+  cryptographically random bytes) and returns the user ID, nick, and token.
+- The auth token implicitly identifies the client. Clients present it via
+  `Authorization: Bearer <token>`.
+- Anonymous sessions are ephemeral — when the session expires or the user
+  QUITs, the nick is released and there is no way to reclaim it.
 
-#### Setting a Password (Optional, for Multi-Client Access)
+#### Registered Accounts (Optional)
 
-For users who want to access the same session from multiple devices:
+For users who want multi-client access (multiple devices sharing one session):
 
-- **Set password via IRC PASS command**: the authenticated client sends
-  `POST /api/v1/messages` with `{"command":"PASS","body":["mypassword"]}`.
-  The server hashes the password with bcrypt and stores it on the session.
-  Password must be at least 8 characters.
-- **Login from another client**: `POST /api/v1/login` with nick and password →
-  server verifies the password, creates a new client for the existing session,
-  and sets an auth cookie. Channel memberships and message queues are shared.
-  Login only works while the session still exists — if all clients have logged
-  out or the user has sent QUIT, the session is deleted and the password is
-  lost.
+- **Registration**: client sends `POST /api/v1/register` with a nick and
+  password (minimum 8 characters) → server creates a session with the
+  password hashed via bcrypt, and returns the user ID, nick, and auth token.
+- **Login**: client sends `POST /api/v1/login` with nick and password →
+  server verifies the password against the stored bcrypt hash and creates a
+  new client token for the existing session. This enables multi-client
+  access: logging in from a new device adds a client to the existing session
+  rather than creating a new one, so channel memberships and message queues
+  are shared. Note: login only works while the session still exists — if all
+  clients have logged out or the user has sent QUIT, the session is deleted
+  and the registration is lost.
+- Registered accounts cannot be logged into via `POST /api/v1/session` —
+  that endpoint is for anonymous sessions only.
+- Anonymous sessions (created via `/session`) cannot be logged into via
+  `/login` because they have no password set.
 
-#### Common Properties
+#### Common Properties (Both Paths)
 
 - Nicks are changeable via the `NICK` command; the server-assigned user ID is
   the stable identity.
 - Server-assigned IDs — clients do not choose their own IDs.
-- Auth cookies contain opaque random bytes, **not JWTs**. No claims, no expiry
-  encoded in the token, no client-side decode. The server is the sole authority
-  on cookie validity.
+- Tokens are opaque random bytes, **not JWTs**. No claims, no expiry encoded
+  in the token, no client-side decode. The server is the sole authority on
+  token validity.
 
 **Rationale:** IRC has no accounts. You connect, pick a nick, and talk.
 Anonymous sessions preserve that simplicity — instant access, zero friction.
 But some users want to access the same session from multiple devices without
-a bouncer. The PASS command enables multi-client login without adding friction
-for casual users: if you don't need multi-client, just create a session and
-go. Cookie-based auth eliminates token management from client code entirely —
-browsers and HTTP cookie jars handle it automatically. Note: both anonymous
-and password-protected sessions are deleted when the last client disconnects
-(QUIT or logout). Identity verification at the message layer via cryptographic
-signatures (see [Security Model](#security-model)) remains independent of
-password status.
+a bouncer. Optional registration with password enables multi-client login
+without adding friction for casual users: if you don't want an account,
+don't create one. Note: in the current implementation, both anonymous and
+registered sessions are deleted when the last client disconnects (QUIT or
+logout); registration does not make a session survive all-client
+removal. Identity verification at the message layer via cryptographic
+signatures (see [Security Model](#security-model)) remains independent
+of account registration.
 
 ### Nick Semantics
 
@@ -228,7 +232,7 @@ A single user session can have multiple clients (phone, laptop, terminal).
 - The server fans out all S2C messages to every active client queue for that
   user session.
 - `GET /api/v1/messages` delivers from the calling client's specific queue,
-  identified by the auth cookie.
+  identified by the auth token.
 - Client queues have **independent expiry/pruning** — one client going offline
   doesn't affect others.
 
@@ -240,10 +244,11 @@ User Session
 ```
 
 **Multi-client via login:** The `POST /api/v1/login` endpoint adds a new
-client to an existing session (one that has a password set via PASS command),
-enabling true multi-client support (multiple cookies sharing one nick/session
-with independent message queues). Sessions without a password cannot be
-logged into.
+client to an existing registered session, enabling true multi-client support
+(multiple tokens sharing one nick/session with independent message queues).
+Anonymous sessions created via `POST /api/v1/session` always create a new
+user with a new nick. A future endpoint to "add a client to an existing
+anonymous session" is planned but not yet implemented.
 
 **Rationale:** The fundamental IRC mobile problem is that you can't have your
 phone and laptop connected simultaneously without a bouncer. Server-side
@@ -350,22 +355,19 @@ over binary is measured in bytes per message, not meaningful bandwidth. The
 canonicalization story (RFC 8785 JCS) is also well-defined for JSON, which
 matters for signing.
 
-### Why Opaque Cookies Instead of JWTs
+### Why Opaque Tokens Instead of JWTs
 
 JWTs encode claims that clients can decode and potentially rely on. This
 creates a coupling between token format and client behavior. If the server
 needs to revoke a token, change the expiry model, or add/remove claims, JWT
 clients may break or behave incorrectly.
 
-Opaque auth cookies are simpler:
-- Server generates 32 random bytes → hex-encodes → stores SHA-256 hash →
-  sets raw hex as an HttpOnly cookie
-- On each request, server hashes the cookie value and looks it up
-- Revocation is a database delete (cookie becomes invalid immediately)
+Opaque tokens are simpler:
+- Server generates 32 random bytes → hex-encodes → stores SHA-256 hash
+- Client presents the raw token; server hashes and looks it up
+- Revocation is a database delete
 - No clock skew issues, no algorithm confusion, no "none" algorithm attacks
-- Cookie format can change without breaking clients
-- Clients never handle tokens directly — browsers and HTTP cookie jars
-  manage everything automatically
+- Token format can change without breaking clients
 
 ---
 
@@ -389,18 +391,17 @@ The entire read/write loop for a client is two endpoints. Everything else
 
 ### Session Lifecycle
 
-#### Session Creation
+#### Anonymous Session
 
 ```
 ┌─ Client ──────────────────────────────────────────────────┐
 │                                                            │
 │  1. POST /api/v1/session {"nick":"alice"}                  │
-│     → Set-Cookie: neoirc_auth=<token>; HttpOnly; ...       │
-│     → {"id":1, "nick":"alice"}                             │
+│     → {"id":1, "nick":"alice", "token":"a1b2c3..."}       │
 │                                                            │
 │  2. POST /api/v1/messages {"command":"JOIN","to":"#gen"}   │
 │     → {"status":"joined","channel":"#general"}             │
-│     (Cookie sent automatically on all subsequent requests) │
+│     (Server fans out JOIN event to all #general members)   │
 │                                                            │
 │  3. POST /api/v1/messages {"command":"PRIVMSG",            │
 │       "to":"#general","body":["hello"]}                    │
@@ -417,37 +418,31 @@ The entire read/write loop for a client is two endpoints. Everything else
 │  6. POST /api/v1/messages {"command":"QUIT"}               │
 │     → {"status":"quit"}                                    │
 │     (Server broadcasts QUIT, removes from channels,        │
-│      deletes session, releases nick, clears cookie)        │
+│      deletes session, releases nick)                       │
 │                                                            │
 └────────────────────────────────────────────────────────────┘
 ```
 
-#### Multi-Client via Password
+#### Registered Account
 
 ```
-┌─ Client A ────────────────────────────────────────────────┐
+┌─ Client ──────────────────────────────────────────────────┐
 │                                                            │
-│  1. POST /api/v1/session {"nick":"alice"}                  │
-│     → Set-Cookie: neoirc_auth=<token_a>; HttpOnly; ...     │
-│     → {"id":1, "nick":"alice"}                             │
-│                                                            │
-│  2. POST /api/v1/messages                                  │
-│     {"command":"PASS","body":["s3cret!!"]}                 │
-│     → {"status":"ok"}                                      │
-│     (Password set via IRC PASS command)                    │
+│  1. POST /api/v1/register                                  │
+│     {"nick":"alice", "password":"s3cret!!"}                │
+│     → {"id":1, "nick":"alice", "token":"a1b2c3..."}       │
+│     (Session created with bcrypt-hashed password)          │
 │                                                            │
 │  ... use the API normally (JOIN, PRIVMSG, poll, etc.) ...  │
 │                                                            │
-└────────────────────────────────────────────────────────────┘
-
-┌─ Client B (another device, while session is still active) ┐
+│  (From another device, while session is still active)      │
 │                                                            │
-│  3. POST /api/v1/login                                     │
+│  2. POST /api/v1/login                                     │
 │     {"nick":"alice", "password":"s3cret!!"}                │
-│     → Set-Cookie: neoirc_auth=<token_b>; HttpOnly; ...     │
-│     → {"id":1, "nick":"alice"}                             │
+│     → {"id":1, "nick":"alice", "token":"d4e5f6..."}       │
 │     (New client added to existing session — channels       │
-│      and message queues are preserved.)                    │
+│      and message queues are preserved. If all clients      │
+│      have logged out, session no longer exists.)           │
 │                                                            │
 └────────────────────────────────────────────────────────────┘
 ```
@@ -528,7 +523,7 @@ the same JSON envelope:
 | `params`  | array of strings    | Sometimes | Sometimes | Additional IRC-style positional parameters. Used by commands like `MODE`, `KICK`, and numeric replies like `353` (NAMES). |
 | `body`    | array or object     | Usually   | Usually   | Structured message body. For text messages: array of strings (one per line). For structured data (e.g., `PUBKEY`): JSON object. **Never a raw string.** |
 | `ts`      | string (ISO 8601)   | Ignored   | Always    | Server-assigned timestamp in RFC 3339 / ISO 8601 format with nanosecond precision. Example: `"2026-02-10T20:00:00.000000000Z"`. Always UTC. |
-| `meta`    | object              | Optional  | If present | Extensible metadata. Used for cryptographic signatures (`meta.sig`, `meta.alg`), hashcash proof-of-work (`meta.hashcash`), content hashes, or any client-defined key/value pairs. Server relays `meta` verbatim except for `hashcash` which is validated on channels with `+H` mode. |
+| `meta`    | object              | Optional  | If present | Extensible metadata. Used for cryptographic signatures (`meta.sig`, `meta.alg`), content hashes, or any client-defined key/value pairs. Server relays `meta` verbatim — it does not interpret or validate it. |
 
 **Important invariants:**
 
@@ -734,35 +729,6 @@ Change the user's nickname.
 
 **IRC reference:** RFC 1459 §4.1.2
 
-#### PASS — Set Session Password
-
-Set a password on the current session, enabling multi-client login via
-`POST /api/v1/login`. The password is hashed with bcrypt and stored
-server-side.
-
-**C2S:**
-```json
-{"command": "PASS", "body": ["mypassword"]}
-```
-
-**Behavior:**
-
-- `body[0]` is the password. Must be at least 8 characters.
-- On success, the server responds with `{"status": "ok"}`.
-- If the password is too short or missing, the server sends
-  ERR_NEEDMOREPARAMS (461) via the message queue.
-- Calling PASS again overwrites the previous password.
-- Once a password is set, `POST /api/v1/login` can be used with the nick
-  and password to create additional clients on the same session.
-
-**Response:** `200 OK`
-```json
-{"status": "ok"}
-```
-
-**IRC reference:** Inspired by RFC 1459 §4.1.1 (PASS), repurposed for
-session password management.
-
 #### TOPIC — Set Channel Topic
 
 Set or change a channel's topic.
@@ -829,7 +795,7 @@ Destroy the session and disconnect from the server.
   quitting user. The quitting user does **not** receive their own QUIT.
 - The user is removed from all channels.
 - Empty channels are deleted (ephemeral).
-- The user's session is destroyed — the auth cookie is invalidated, the nick
+- The user's session is destroyed — the auth token is invalidated, the nick
   is released.
 - Subsequent requests with the old token return HTTP 401.
 
@@ -1047,13 +1013,12 @@ carries IRC-style parameters (e.g., channel name, target nick).
 Inspired by IRC, simplified:
 
 | Mode | Name         | Meaning |
-|------|----------------|---------|
+|------|--------------|---------|
 | `+i` | Invite-only  | Only invited users can join |
 | `+m` | Moderated    | Only voiced (`+v`) users and operators (`+o`) can send |
 | `+s` | Secret       | Channel hidden from LIST response |
 | `+t` | Topic lock   | Only operators can change the topic |
 | `+n` | No external  | Only channel members can send messages to the channel |
-| `+H` | Hashcash       | Requires proof-of-work for PRIVMSG (parameter: bits, e.g. `+H 20`) |
 
 **User channel modes (set per-user per-channel):**
 
@@ -1064,64 +1029,14 @@ Inspired by IRC, simplified:
 
 **Status:** Channel modes are defined but not yet enforced. The `modes` column
 exists in the channels table but the server does not check modes on actions.
-Exception: `+H` (hashcash) is fully enforced — see below.
-
-### Per-Channel Hashcash (Anti-Spam)
-
-Channels can require hashcash proof-of-work for every `PRIVMSG`. This is an
-anti-spam mechanism: channel operators set a difficulty level, and clients must
-compute a proof-of-work stamp bound to the specific channel and message before
-sending.
-
-**Setting the requirement:**
-
-```
-MODE #channel +H <bits>    — require <bits> leading zero bits (1-40)
-MODE #channel -H           — disable hashcash requirement
-```
-
-**Stamp format:** `1:bits:YYMMDD:channel:bodyhash:counter`
-
-- `bits` — difficulty (leading zero bits in SHA-256 hash of the stamp)
-- `YYMMDD` — current date (prevents old token reuse)
-- `channel` — channel name (prevents cross-channel reuse)
-- `bodyhash` — hex-encoded SHA-256 of the message body (binds stamp to message)
-- `counter` — hex nonce
-
-**Sending a message to a hashcash-protected channel:**
-
-Include the hashcash stamp in the `meta` field:
-
-```json
-{
-  "command": "PRIVMSG",
-  "to": "#general",
-  "body": ["hello world"],
-  "meta": {
-    "hashcash": "1:20:260317:#general:a1b2c3...bodyhash:1f4a"
-  }
-}
-```
-
-**Server validation:** The server checks that the stamp is well-formed, meets
-the required difficulty, is bound to the correct channel and message body, has a
-recent date, and has not been previously used. Spent stamps are cached for 1
-year to prevent replay attacks.
-
-**Error responses:** If the channel requires hashcash and the stamp is missing,
-invalid, or replayed, the server returns `ERR_CANNOTSENDTOCHAN (404)` with a
-descriptive reason.
-
-**Client minting:** The CLI provides `MintChannelHashcash(bits, channel, body)`
-to compute stamps. Higher bit counts take exponentially longer to compute.
 
 ---
 
 ## API Reference
 
 All endpoints accept and return `application/json`. Authenticated endpoints
-require the `neoirc_auth` cookie, which is set automatically by
-`POST /api/v1/session` and `POST /api/v1/login`.
+require `Authorization: Bearer <token>` header. The token is obtained from
+`POST /api/v1/session`.
 
 All API responses include appropriate HTTP status codes. Error responses have
 the format:
@@ -1150,18 +1065,11 @@ difficulty is advertised via `GET /api/v1/server` in the `hashcash_bits` field.
 | `pow_token` | string | Conditional | Hashcash stamp (required when server has `hashcash_bits` > 0) |
 
 **Response:** `201 Created`
-
-The response sets an `neoirc_auth` HttpOnly cookie containing the auth token.
-The JSON body does **not** include the token.
-
-```
-Set-Cookie: neoirc_auth=494ba9fc...e3; Path=/; HttpOnly; SameSite=Strict
-```
-
 ```json
 {
   "id": 1,
-  "nick": "alice"
+  "nick": "alice",
+  "token": "494ba9fc0f2242873fc5c285dd4a24fc3844ba5e67789a17e69b6fe5f8c132e3"
 }
 ```
 
@@ -1169,16 +1077,7 @@ Set-Cookie: neoirc_auth=494ba9fc...e3; Path=/; HttpOnly; SameSite=Strict
 |---------|---------|-------------|
 | `id`    | integer | Server-assigned user ID |
 | `nick`  | string  | Confirmed nick (always matches request on success) |
-
-**Cookie properties:**
-
-| Property   | Value |
-|------------|-------|
-| `Name`     | `neoirc_auth` |
-| `HttpOnly` | `true` (not accessible from JavaScript) |
-| `SameSite` | `Strict` (prevents CSRF) |
-| `Secure`   | `true` when behind TLS |
-| `Path`     | `/` |
+| `token` | string  | 64-character hex auth token. Store this — it's the only credential. |
 
 **Errors:**
 
@@ -1191,18 +1090,66 @@ Set-Cookie: neoirc_auth=494ba9fc...e3; Path=/; HttpOnly; SameSite=Strict
 
 **curl example:**
 ```bash
-# Use -c to save cookies, -b to send them
-curl -s -c cookies.txt -X POST http://localhost:8080/api/v1/session \
+TOKEN=$(curl -s -X POST http://localhost:8080/api/v1/session \
   -H 'Content-Type: application/json' \
-  -d '{"nick":"alice","pow_token":"1:20:260310:neoirc::3a2f1"}'
+  -d '{"nick":"alice","pow_token":"1:20:260310:neoirc::3a2f1"}' | jq -r .token)
+echo $TOKEN
+```
+
+### POST /api/v1/register — Register Account
+
+Create a new user session with a password. The password is hashed
+with bcrypt and stored server-side. The password enables login from
+additional clients via `POST /api/v1/login` while the session
+remains active.
+
+**Request Body:**
+```json
+{"nick": "alice", "password": "mypassword"}
+```
+
+| Field      | Type   | Required | Constraints |
+|------------|--------|----------|-------------|
+| `nick`     | string | Yes      | 1–32 characters, must be unique on the server |
+| `password` | string | Yes      | Minimum 8 characters |
+
+**Response:** `201 Created`
+```json
+{
+  "id": 1,
+  "nick": "alice",
+  "token": "494ba9fc0f2242873fc5c285dd4a24fc3844ba5e67789a17e69b6fe5f8c132e3"
+}
+```
+
+| Field   | Type    | Description |
+|---------|---------|-------------|
+| `id`    | integer | Server-assigned user ID |
+| `nick`  | string  | Confirmed nick |
+| `token` | string  | 64-character hex auth token |
+
+**Errors:**
+
+| Status | Error | When |
+|--------|-------|------|
+| 400    | `invalid nick format` | Nick doesn't match allowed format |
+| 400    | `password must be at least 8 characters` | Password too short |
+| 409    | `nick already taken` | Another active session holds this nick |
+
+**curl example:**
+```bash
+TOKEN=$(curl -s -X POST http://localhost:8080/api/v1/register \
+  -H 'Content-Type: application/json' \
+  -d '{"nick":"alice","password":"mypassword"}' | jq -r .token)
+echo $TOKEN
 ```
 
 ### POST /api/v1/login — Login to Account
 
-Authenticate with a nick and password (set via the PASS IRC command). Creates a
-new client for the existing session, preserving channel memberships and message
-queues. This is how multi-client access works: each login adds a new client to
-the session with its own auth cookie and message delivery queue.
+Authenticate with a previously registered nick and password. Creates a new
+client token for the existing session, preserving channel memberships and
+message queues. This is how multi-client access works for registered accounts:
+each login adds a new client to the session.
 
 On successful login, the server enqueues MOTD messages and synthetic channel
 state (JOIN + TOPIC + NAMES for each channel the session belongs to) into the
@@ -1215,37 +1162,37 @@ new client's queue, so the client can immediately restore its UI state.
 
 | Field      | Type   | Required | Constraints |
 |------------|--------|----------|-------------|
-| `nick`     | string | Yes      | Must match an active session with a password set |
-| `password` | string | Yes      | Must match the session's password |
+| `nick`     | string | Yes      | Must match a registered account |
+| `password` | string | Yes      | Must match the account's password |
 
 **Response:** `200 OK`
-
-The response sets an `neoirc_auth` HttpOnly cookie for the new client.
-
 ```json
 {
   "id": 1,
-  "nick": "alice"
+  "nick": "alice",
+  "token": "7e8f9a0b1c2d3e4f5a6b7c8d9e0f1a2b3c4d5e6f7a8b9c0d1e2f3a4b5c6d7e8f"
 }
 ```
 
 | Field   | Type    | Description |
 |---------|---------|-------------|
-| `id`    | integer | Session ID |
+| `id`    | integer | Session ID (same as when registered) |
 | `nick`  | string  | Current nick |
+| `token` | string  | New 64-character hex auth token for this client |
 
 **Errors:**
 
 | Status | Error | When |
 |--------|-------|------|
 | 400    | `nick and password required` | Missing nick or password |
-| 401    | `invalid credentials` | Wrong password, nick not found, or session has no password set |
+| 401    | `invalid credentials` | Wrong password, nick not found, or account has no password |
 
 **curl example:**
 ```bash
-curl -s -c cookies.txt -X POST http://localhost:8080/api/v1/login \
+TOKEN=$(curl -s -X POST http://localhost:8080/api/v1/login \
   -H 'Content-Type: application/json' \
-  -d '{"nick":"alice","password":"mypassword"}'
+  -d '{"nick":"alice","password":"mypassword"}' | jq -r .token)
+echo $TOKEN
 ```
 
 ### GET /api/v1/state — Get Session State
@@ -1289,13 +1236,13 @@ Each channel object:
 **curl example:**
 ```bash
 curl -s http://localhost:8080/api/v1/state \
-  -b cookies.txt | jq .
+  -H "Authorization: Bearer $TOKEN" | jq .
 ```
 
 **Reconnect with channel state initialization:**
 ```bash
 curl -s "http://localhost:8080/api/v1/state?initChannelState=1" \
-  -b cookies.txt | jq .
+  -H "Authorization: Bearer $TOKEN" | jq .
 ```
 
 ### GET /api/v1/messages — Poll Messages (Long-Poll)
@@ -1355,12 +1302,14 @@ real-time endpoint — clients call it in a loop.
 
 **curl example (immediate):**
 ```bash
-curl -s -b cookies.txt "http://localhost:8080/api/v1/messages?after=0&timeout=0" | jq .
+curl -s "http://localhost:8080/api/v1/messages?after=0&timeout=0" \
+  -H "Authorization: Bearer $TOKEN" | jq .
 ```
 
 **curl example (long-poll, 15s):**
 ```bash
-curl -s -b cookies.txt "http://localhost:8080/api/v1/messages?after=42&timeout=15" | jq .
+curl -s "http://localhost:8080/api/v1/messages?after=42&timeout=15" \
+  -H "Authorization: Bearer $TOKEN" | jq .
 ```
 
 ### POST /api/v1/messages — Send Command
@@ -1387,7 +1336,6 @@ reference with all required and optional fields.
 | `JOIN`    | `to`                |               | 200 OK          |
 | `PART`    | `to`                | `body`        | 200 OK          |
 | `NICK`    | `body`              |               | 200 OK          |
-| `PASS`    | `body`              |               | 200 OK          |
 | `TOPIC`   | `to`, `body`        |               | 200 OK          |
 | `MODE`    | `to`                |               | 200 OK          |
 | `NAMES`   | `to`                |               | 200 OK          |
@@ -1402,14 +1350,14 @@ All IRC commands return HTTP 200 OK. IRC-level success and error responses
 are delivered as **numeric replies** through the message queue (see
 [Numeric Replies](#numeric-replies) below). HTTP error codes (4xx/5xx) are
 reserved for transport-level problems: malformed JSON (400), missing/invalid
-auth cookies (401), and server errors (500).
+auth tokens (401), and server errors (500).
 
 **HTTP errors (transport-level only):**
 
 | Status | Error | When |
 |--------|-------|------|
 | 400    | `invalid request` | Malformed JSON or empty command |
-| 401    | `unauthorized` | Missing or invalid auth cookie |
+| 401    | `unauthorized` | Missing or invalid auth token |
 | 500    | `internal error` | Server-side failure |
 
 **IRC numeric error replies (delivered via message queue):**
@@ -1500,11 +1448,11 @@ events). Event messages are delivered via the live queue only.
 ```bash
 # Latest 50 messages in #general
 curl -s "http://localhost:8080/api/v1/history?target=%23general&limit=50" \
-  -b cookies.txt | jq .
+  -H "Authorization: Bearer $TOKEN" | jq .
 
 # Older messages (pagination)
 curl -s "http://localhost:8080/api/v1/history?target=%23general&before=100&limit=50" \
-  -b cookies.txt | jq .
+  -H "Authorization: Bearer $TOKEN" | jq .
 ```
 
 ### GET /api/v1/channels — List Channels
@@ -1535,22 +1483,18 @@ List members of a channel. The `{name}` parameter is the channel name
 **curl example:**
 ```bash
 curl -s http://localhost:8080/api/v1/channels/general/members \
-  -b cookies.txt | jq .
+  -H "Authorization: Bearer $TOKEN" | jq .
 ```
 
 ### POST /api/v1/logout — Logout
 
-Destroy the current client's session cookie and server-side client record.
-If no other clients remain on the session, the user is fully cleaned up:
-parted from all channels (with QUIT broadcast to members), session deleted,
-nick released. The auth cookie is cleared in the response.
+Destroy the current client's auth token. If no other clients remain on the
+session, the user is fully cleaned up: parted from all channels (with QUIT
+broadcast to members), session deleted, nick released.
 
-**Request:** No body. Requires auth cookie.
+**Request:** No body. Requires auth.
 
 **Response:** `200 OK`
-
-The response clears the `neoirc_auth` cookie.
-
 ```json
 {"status": "ok"}
 ```
@@ -1559,11 +1503,12 @@ The response clears the `neoirc_auth` cookie.
 
 | Status | Error | When |
 |--------|-------|------|
-| 401    | `unauthorized` | Missing or invalid auth cookie |
+| 401    | `unauthorized` | Missing or invalid auth token |
 
 **curl example:**
 ```bash
-curl -s -b cookies.txt -c cookies.txt -X POST http://localhost:8080/api/v1/logout | jq .
+curl -s -X POST http://localhost:8080/api/v1/logout \
+  -H "Authorization: Bearer $TOKEN" | jq .
 ```
 
 ### GET /api/v1/users/me — Current User Info
@@ -1587,7 +1532,7 @@ Return the current user's session state. This is an alias for
 **curl example:**
 ```bash
 curl -s http://localhost:8080/api/v1/users/me \
-  -b cookies.txt | jq .
+  -H "Authorization: Bearer $TOKEN" | jq .
 ```
 
 ### GET /api/v1/server — Server Info
@@ -1832,21 +1777,20 @@ authenticity.
 
 ### Authentication
 
-- **Cookie-based auth**: Opaque HttpOnly cookies (64 hex chars = 256 bits of
-  entropy). Tokens are hashed (SHA-256) before storage and validated on every
-  request. Cookies are HttpOnly (no JavaScript access), SameSite=Strict
-  (CSRF protection), and Secure when behind TLS.
+- **Session auth**: Opaque bearer tokens (64 hex chars = 256 bits of entropy).
+  Tokens are hashed (SHA-256) before storage and validated on every request.
 - **Anonymous sessions**: `POST /api/v1/session` requires only a nick. No
-  password, instant access. The auth cookie is the sole credential.
-- **Password-protected sessions**: The PASS IRC command sets a bcrypt-hashed
-  password on the session. `POST /api/v1/login` authenticates against the
-  stored hash and issues a new client cookie.
+  password, instant access. The token is the sole credential.
+- **Registered accounts**: `POST /api/v1/register` accepts a nick and password
+  (minimum 8 characters). The password is hashed with bcrypt at the default
+  cost factor and stored alongside the session. `POST /api/v1/login`
+  authenticates against the stored hash and issues a new client token.
 - **Password security**: Passwords are never stored in plain text. bcrypt
-  handles salting and key stretching automatically. Sessions without a
-  password cannot be logged into via `/login`.
-- **Cookie security**: Auth cookies should only be transmitted over HTTPS in
-  production. If a cookie is compromised, the attacker has full access to the
-  session until QUIT or expiry.
+  handles salting and key stretching automatically. Anonymous sessions have
+  an empty `password_hash` and cannot be logged into via `/login`.
+- **Token security**: Tokens should be treated like session cookies. Transmit
+  only over HTTPS in production. If a token is compromised, the attacker has
+  full access to the session until QUIT or expiry.
 
 ### Message Integrity
 
@@ -1883,10 +1827,8 @@ authenticity.
 - **HTTPS is strongly recommended** for production deployments. The server
   itself serves plain HTTP — use a reverse proxy (nginx, Caddy, etc.) for TLS
   termination.
-- **CORS**: The server allows all origins with credentials
-  (`Access-Control-Allow-Credentials: true`), reflecting the request Origin.
-  This enables cookie-based auth from cross-origin clients. Restrict origins
-  in production via reverse proxy configuration if needed.
+- **CORS**: The server allows all origins by default (`Access-Control-Allow-Origin: *`).
+  Restrict this in production via reverse proxy configuration if needed.
 - **Content-Security-Policy**: The server sets a strict CSP header on all
   responses, restricting resource loading to same-origin and disabling
   dangerous features (object embeds, framing, base tag injection). The
@@ -2076,7 +2018,7 @@ skew issues) and simpler than UUIDs (integer comparison vs. string comparison).
 - **Client output queue entries**: Pruned automatically when older than
   `QUEUE_MAX_AGE` (default 30 days).
 - **Channels**: Deleted when the last member leaves (ephemeral).
-- **Sessions**: Both anonymous and password-protected sessions are deleted on `QUIT`
+- **Sessions**: Both anonymous and registered sessions are deleted on `QUIT`
   or when the last client logs out (`POST /api/v1/logout` with no remaining
   clients triggers session cleanup). There is no distinction between session
   types in the cleanup path — `handleQuit` and `cleanupUser` both call
@@ -2237,59 +2179,68 @@ A complete client needs only four HTTP calls:
 ### Step-by-Step with curl
 
 ```bash
-# 1a. Create a session (cookie saved automatically with -c)
-curl -s -c cookies.txt -X POST http://localhost:8080/api/v1/session \
+# 1a. Create an anonymous session (no account)
+export TOKEN=$(curl -s -X POST http://localhost:8080/api/v1/session \
   -H 'Content-Type: application/json' \
-  -d '{"nick":"testuser"}'
+  -d '{"nick":"testuser"}' | jq -r .token)
 
-# 1b. Optionally set a password for multi-client access
-curl -s -b cookies.txt -X POST http://localhost:8080/api/v1/messages \
+# 1b. Or register an account (multi-client support)
+export TOKEN=$(curl -s -X POST http://localhost:8080/api/v1/register \
   -H 'Content-Type: application/json' \
-  -d '{"command":"PASS","body":["mypassword"]}'
+  -d '{"nick":"testuser","password":"mypassword"}' | jq -r .token)
 
-# 1c. Login from another device (saves new cookie)
-curl -s -c cookies2.txt -X POST http://localhost:8080/api/v1/login \
+# 1c. Or login to an existing account
+export TOKEN=$(curl -s -X POST http://localhost:8080/api/v1/login \
   -H 'Content-Type: application/json' \
-  -d '{"nick":"testuser","password":"mypassword"}'
+  -d '{"nick":"testuser","password":"mypassword"}' | jq -r .token)
 
 # 2. Join a channel
-curl -s -b cookies.txt -X POST http://localhost:8080/api/v1/messages \
+curl -s -X POST http://localhost:8080/api/v1/messages \
+  -H "Authorization: Bearer $TOKEN" \
   -H 'Content-Type: application/json' \
   -d '{"command":"JOIN","to":"#general"}'
 
 # 3. Send a message
-curl -s -b cookies.txt -X POST http://localhost:8080/api/v1/messages \
+curl -s -X POST http://localhost:8080/api/v1/messages \
+  -H "Authorization: Bearer $TOKEN" \
   -H 'Content-Type: application/json' \
   -d '{"command":"PRIVMSG","to":"#general","body":["hello from curl!"]}'
 
 # 4. Poll for messages (one-shot)
-curl -s -b cookies.txt "http://localhost:8080/api/v1/messages?after=0&timeout=0" | jq .
+curl -s "http://localhost:8080/api/v1/messages?after=0&timeout=0" \
+  -H "Authorization: Bearer $TOKEN" | jq .
 
 # 5. Long-poll (blocks up to 15s waiting for messages)
-curl -s -b cookies.txt "http://localhost:8080/api/v1/messages?after=0&timeout=15" | jq .
+curl -s "http://localhost:8080/api/v1/messages?after=0&timeout=15" \
+  -H "Authorization: Bearer $TOKEN" | jq .
 
 # 6. Send a DM
-curl -s -b cookies.txt -X POST http://localhost:8080/api/v1/messages \
+curl -s -X POST http://localhost:8080/api/v1/messages \
+  -H "Authorization: Bearer $TOKEN" \
   -H 'Content-Type: application/json' \
   -d '{"command":"PRIVMSG","to":"othernick","body":["hey!"]}'
 
 # 7. Change nick
-curl -s -b cookies.txt -X POST http://localhost:8080/api/v1/messages \
+curl -s -X POST http://localhost:8080/api/v1/messages \
+  -H "Authorization: Bearer $TOKEN" \
   -H 'Content-Type: application/json' \
   -d '{"command":"NICK","body":["newnick"]}'
 
 # 8. Set channel topic
-curl -s -b cookies.txt -X POST http://localhost:8080/api/v1/messages \
+curl -s -X POST http://localhost:8080/api/v1/messages \
+  -H "Authorization: Bearer $TOKEN" \
   -H 'Content-Type: application/json' \
   -d '{"command":"TOPIC","to":"#general","body":["New topic!"]}'
 
 # 9. Leave a channel
-curl -s -b cookies.txt -X POST http://localhost:8080/api/v1/messages \
+curl -s -X POST http://localhost:8080/api/v1/messages \
+  -H "Authorization: Bearer $TOKEN" \
   -H 'Content-Type: application/json' \
   -d '{"command":"PART","to":"#general","body":["goodbye"]}'
 
 # 10. Disconnect
-curl -s -b cookies.txt -X POST http://localhost:8080/api/v1/messages \
+curl -s -X POST http://localhost:8080/api/v1/messages \
+  -H "Authorization: Bearer $TOKEN" \
   -H 'Content-Type: application/json' \
   -d '{"command":"QUIT","body":["leaving"]}'
 ```
@@ -2299,25 +2250,27 @@ curl -s -b cookies.txt -X POST http://localhost:8080/api/v1/messages \
 The key to real-time messaging is the poll loop. Here's the pattern:
 
 ```python
-# Python example — using requests.Session for automatic cookie handling
-import requests, json, time
+# Python example
+import requests, json
 
 BASE = "http://localhost:8080/api/v1"
-session = requests.Session()  # Manages cookies automatically
+token = None
 last_id = 0
 
-# Create session (cookie set automatically via Set-Cookie header)
-resp = session.post(f"{BASE}/session", json={"nick": "pybot"})
-print(f"Session: {resp.json()}")
+# Create session
+resp = requests.post(f"{BASE}/session", json={"nick": "pybot"})
+token = resp.json()["token"]
+headers = {"Authorization": f"Bearer {token}"}
 
 # Join channel
-session.post(f"{BASE}/messages",
+requests.post(f"{BASE}/messages", headers=headers,
               json={"command": "JOIN", "to": "#general"})
 
 # Poll loop
 while True:
     try:
-        resp = session.get(f"{BASE}/messages",
+        resp = requests.get(f"{BASE}/messages",
+                          headers=headers,
                           params={"after": last_id, "timeout": 15},
                           timeout=20)  # HTTP timeout > long-poll timeout
         data = resp.json()
@@ -2334,14 +2287,14 @@ while True:
 ```
 
 ```javascript
-// JavaScript/browser example — cookies sent automatically
-async function pollLoop() {
+// JavaScript/browser example
+async function pollLoop(token) {
   let lastId = 0;
   while (true) {
     try {
       const resp = await fetch(
         `/api/v1/messages?after=${lastId}&timeout=15`,
-        {credentials: 'same-origin'}  // Include cookies
+        {headers: {'Authorization': `Bearer ${token}`}}
       );
       if (resp.status === 401) { /* session expired */ break; }
       const data = await resp.json();
@@ -2373,8 +2326,8 @@ Clients should handle these message commands from the queue:
 
 ### Error Handling
 
-- **HTTP 401**: Auth cookie expired or invalid. Re-create session or
-  re-login (if a password was set).
+- **HTTP 401**: Token expired or invalid. Re-create session (anonymous) or
+  re-login (registered account).
 - **HTTP 404**: Channel or user not found.
 - **HTTP 409**: Nick already taken (on session creation, registration, or
   NICK change).
@@ -2394,11 +2347,10 @@ Clients should handle these message commands from the queue:
 4. **DM tab logic**: When you receive a PRIVMSG where `to` is not a channel
    (no `#` prefix), the DM tab should be keyed by the **other** user's nick:
    if `from` is you, use `to`; if `from` is someone else, use `from`.
-5. **Reconnection**: If the poll loop fails with 401, the auth cookie is
-   invalid. For sessions without a password, create a new session. For
-   sessions with a password set (via PASS command), log in again via
-   `POST /api/v1/login` to get a fresh cookie on the same session. If it
-   fails with a network error, retry with backoff.
+5. **Reconnection**: If the poll loop fails with 401, the token is invalid.
+   For anonymous sessions, create a new session. For registered accounts,
+   log in again via `POST /api/v1/login` to get a fresh token on the same
+   session. If it fails with a network error, retry with backoff.
 
 ---
 
@@ -2557,10 +2509,8 @@ creating one session pays once and keeps their session.
   331-332 TOPIC, 352-353 WHO/NAMES, 366, 372-376 MOTD, 401-461 errors)
 - [ ] **Max message size enforcement** — reject oversized messages
 - [ ] **NOTICE command** — distinct from PRIVMSG (no auto-reply flag)
-- [x] **Multi-client sessions** — set a password via PASS command, then
-  login from additional devices via `POST /api/v1/login`
-- [x] **Cookie-based auth** — HttpOnly cookies replace Bearer tokens for
-  all API authentication
+- [ ] **Multi-client sessions** — add client to existing session
+  (share nick across devices)
 
 ### Future (1.0+)
 
@@ -2673,12 +2623,13 @@ neoirc/
    build a working IRC-style TUI client against this API in an afternoon, the
    API is too complex.
 
-2. **Passwords optional** — anonymous sessions are instant: pick a nick and
+2. **Accounts optional** — anonymous sessions are instant: pick a nick and
    talk. No registration, no email verification. The cost of entry is a
    hashcash proof, not bureaucracy. For users who want multi-client access
-   (multiple devices sharing one session), the PASS command sets a password
-   on the session — but it's never required. Identity verification at the
-   message layer uses cryptographic signing, independent of password status.
+   (multiple devices sharing one session), optional account registration
+   with password is available — but never required. Identity
+   verification at the message layer uses cryptographic signing,
+   independent of account status.
 
 3. **IRC semantics over HTTP** — command names and numeric codes from
    RFC 1459/2812. If you've built an IRC client or bot, you already know the

internal/cli/api/client.go

@@ -9,7 +9,6 @@ import (
 	"fmt"
 	"io"
 	"net/http"
-	"net/http/cookiejar"
 	"net/url"
 	"strconv"
 	"strings"
@@ -29,19 +28,16 @@ var errHTTP = errors.New("HTTP error")
 // Client wraps HTTP calls to the neoirc server API.
 type Client struct {
 	BaseURL    string
+	Token      string
 	HTTPClient *http.Client
 }
 
-// NewClient creates a new API client with a cookie jar
-// for automatic auth cookie management.
+// NewClient creates a new API client.
 func NewClient(baseURL string) *Client {
-	jar, _ := cookiejar.New(nil)
-
-	return &Client{
+	return &Client{ //nolint:exhaustruct // Token set after CreateSession
 		BaseURL: baseURL,
 		HTTPClient: &http.Client{ //nolint:exhaustruct // defaults fine
 			Timeout: httpTimeout,
-			Jar:     jar,
 		},
 	}
 }
@@ -83,6 +79,8 @@ func (client *Client) CreateSession(
 		return nil, fmt.Errorf("decode session: %w", err)
 	}
 
+	client.Token = resp.Token
+
 	return &resp, nil
 }
 
@@ -123,7 +121,6 @@ func (client *Client) PollMessages(
 		Timeout: time.Duration(
 			timeout+pollExtraTime,
 		) * time.Second,
-		Jar: client.HTTPClient.Jar,
 	}
 
 	params := url.Values{}
@@ -148,6 +145,10 @@ func (client *Client) PollMessages(
 		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)
@@ -303,6 +304,12 @@ func (client *Client) do(
 		"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)

internal/cli/api/hashcash.go

@@ -7,8 +7,6 @@ import (
 	"fmt"
 	"math/big"
 	"time"
-
-	"git.eeqj.de/sneak/neoirc/internal/hashcash"
 )
 
 const (
@@ -39,23 +37,6 @@ func MintHashcash(bits int, resource string) string {
 	}
 }
 
-// MintChannelHashcash computes a hashcash stamp bound to
-// a specific channel and message body. The stamp format
-// is 1:bits:YYMMDD:channel:bodyhash:counter where
-// bodyhash is the hex-encoded SHA-256 of the message
-// body bytes. Delegates to the internal/hashcash package.
-func MintChannelHashcash(
-	bits int,
-	channel string,
-	body []byte,
-) string {
-	bodyHash := hashcash.BodyHash(body)
-
-	return hashcash.MintChannelStamp(
-		bits, channel, bodyHash,
-	)
-}
-
 // hasLeadingZeroBits checks if hash has at least numBits
 // leading zero bits.
 func hasLeadingZeroBits(

internal/cli/api/types.go

@@ -12,6 +12,7 @@ type SessionRequest struct {
 type SessionResponse struct {
 	ID    int64  `json:"id"`
 	Nick  string `json:"nick"`
+	Token string `json:"token"`
 }
 
 // StateResponse is the response from GET /api/v1/state.

internal/db/auth.go

@@ -16,28 +16,80 @@ var errNoPassword = errors.New(
 	"account has no password set",
 )
 
-// SetPassword sets a bcrypt-hashed password on a session,
-// enabling multi-client login via POST /api/v1/login.
-func (database *Database) SetPassword(
+// RegisterUser creates a session with a hashed password
+// and returns session ID, client ID, and token.
+func (database *Database) RegisterUser(
 	ctx context.Context,
-	sessionID int64,
-	password string,
-) error {
+	nick, password string,
+) (int64, int64, string, error) {
 	hash, err := bcrypt.GenerateFromPassword(
 		[]byte(password), bcryptCost,
 	)
 	if err != nil {
-		return fmt.Errorf("hash password: %w", err)
+		return 0, 0, "", fmt.Errorf(
+			"hash password: %w", err,
+		)
 	}
 
-	_, err = database.conn.ExecContext(ctx,
-		"UPDATE sessions SET password_hash = ? WHERE id = ?",
-		string(hash), sessionID)
+	sessionUUID := uuid.New().String()
+	clientUUID := uuid.New().String()
+
+	token, err := generateToken()
 	if err != nil {
-		return fmt.Errorf("set password: %w", err)
+		return 0, 0, "", err
 	}
 
-	return nil
+	now := time.Now()
+
+	transaction, err := database.conn.BeginTx(ctx, nil)
+	if err != nil {
+		return 0, 0, "", fmt.Errorf(
+			"begin tx: %w", err,
+		)
+	}
+
+	res, err := transaction.ExecContext(ctx,
+		`INSERT INTO sessions
+		 (uuid, nick, password_hash,
+		  created_at, last_seen)
+		 VALUES (?, ?, ?, ?, ?)`,
+		sessionUUID, nick, string(hash), now, now)
+	if err != nil {
+		_ = transaction.Rollback()
+
+		return 0, 0, "", fmt.Errorf(
+			"create session: %w", err,
+		)
+	}
+
+	sessionID, _ := res.LastInsertId()
+
+	tokenHash := hashToken(token)
+
+	clientRes, err := transaction.ExecContext(ctx,
+		`INSERT INTO clients
+		 (uuid, session_id, token,
+		  created_at, last_seen)
+		 VALUES (?, ?, ?, ?, ?)`,
+		clientUUID, sessionID, tokenHash, now, now)
+	if err != nil {
+		_ = transaction.Rollback()
+
+		return 0, 0, "", fmt.Errorf(
+			"create client: %w", err,
+		)
+	}
+
+	clientID, _ := clientRes.LastInsertId()
+
+	err = transaction.Commit()
+	if err != nil {
+		return 0, 0, "", fmt.Errorf(
+			"commit registration: %w", err,
+		)
+	}
+
+	return sessionID, clientID, token, nil
 }
 
 // LoginUser verifies a nick/password and creates a new

internal/db/auth_test.go

@@ -6,65 +6,63 @@ import (
 	_ "modernc.org/sqlite"
 )
 
-func TestSetPassword(t *testing.T) {
+func TestRegisterUser(t *testing.T) {
 	t.Parallel()
 
 	database := setupTestDB(t)
 	ctx := t.Context()
 
-	sessionID, _, _, err :=
-		database.CreateSession(ctx, "passuser")
+	sessionID, clientID, token, err :=
+		database.RegisterUser(ctx, "reguser", "password123")
 	if err != nil {
 		t.Fatal(err)
 	}
 
-	err = database.SetPassword(
-		ctx, sessionID, "password123",
-	)
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	// Verify we can now log in with the password.
-	loginSID, loginCID, loginToken, err :=
-		database.LoginUser(ctx, "passuser", "password123")
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	if loginSID == 0 || loginCID == 0 || loginToken == "" {
+	if sessionID == 0 || clientID == 0 || token == "" {
 		t.Fatal("expected valid ids and token")
 	}
+
+	// Verify session works via token lookup.
+	sid, cid, nick, err :=
+		database.GetSessionByToken(ctx, token)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if sid != sessionID || cid != clientID {
+		t.Fatal("session/client id mismatch")
+	}
+
+	if nick != "reguser" {
+		t.Fatalf("expected reguser, got %s", nick)
+	}
 }
 
-func TestSetPasswordThenWrongLogin(t *testing.T) {
+func TestRegisterUserDuplicateNick(t *testing.T) {
 	t.Parallel()
 
 	database := setupTestDB(t)
 	ctx := t.Context()
 
-	sessionID, _, _, err :=
-		database.CreateSession(ctx, "wrongpw")
+	regSID, regCID, regToken, err :=
+		database.RegisterUser(ctx, "dupnick", "password123")
 	if err != nil {
 		t.Fatal(err)
 	}
 
-	err = database.SetPassword(
-		ctx, sessionID, "correctpass",
-	)
-	if err != nil {
-		t.Fatal(err)
+	_ = regSID
+	_ = regCID
+	_ = regToken
+
+	dupSID, dupCID, dupToken, dupErr :=
+		database.RegisterUser(ctx, "dupnick", "other12345")
+	if dupErr == nil {
+		t.Fatal("expected error for duplicate nick")
 	}
 
-	loginSID, loginCID, loginToken, loginErr :=
-		database.LoginUser(ctx, "wrongpw", "wrongpass12")
-	if loginErr == nil {
-		t.Fatal("expected error for wrong password")
-	}
-
-	_ = loginSID
-	_ = loginCID
-	_ = loginToken
+	_ = dupSID
+	_ = dupCID
+	_ = dupToken
 }
 
 func TestLoginUser(t *testing.T) {
@@ -73,26 +71,23 @@ func TestLoginUser(t *testing.T) {
 	database := setupTestDB(t)
 	ctx := t.Context()
 
-	sessionID, _, _, err :=
-		database.CreateSession(ctx, "loginuser")
+	regSID, regCID, regToken, err :=
+		database.RegisterUser(ctx, "loginuser", "mypassword")
 	if err != nil {
 		t.Fatal(err)
 	}
 
-	err = database.SetPassword(
-		ctx, sessionID, "mypassword",
-	)
-	if err != nil {
-		t.Fatal(err)
-	}
+	_ = regSID
+	_ = regCID
+	_ = regToken
 
-	loginSID, loginCID, token, err :=
+	sessionID, clientID, token, err :=
 		database.LoginUser(ctx, "loginuser", "mypassword")
 	if err != nil {
 		t.Fatal(err)
 	}
 
-	if loginSID == 0 || loginCID == 0 || token == "" {
+	if sessionID == 0 || clientID == 0 || token == "" {
 		t.Fatal("expected valid ids and token")
 	}
 
@@ -108,6 +103,33 @@ func TestLoginUser(t *testing.T) {
 	}
 }
 
+func TestLoginUserWrongPassword(t *testing.T) {
+	t.Parallel()
+
+	database := setupTestDB(t)
+	ctx := t.Context()
+
+	regSID, regCID, regToken, err :=
+		database.RegisterUser(ctx, "wrongpw", "correctpass")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	_ = regSID
+	_ = regCID
+	_ = regToken
+
+	loginSID, loginCID, loginToken, loginErr :=
+		database.LoginUser(ctx, "wrongpw", "wrongpass12")
+	if loginErr == nil {
+		t.Fatal("expected error for wrong password")
+	}
+
+	_ = loginSID
+	_ = loginCID
+	_ = loginToken
+}
+
 func TestLoginUserNoPassword(t *testing.T) {
 	t.Parallel()
 

internal/db/queries.go

@@ -1305,110 +1305,3 @@ func (database *Database) GetQueueEntryCount(
 
 	return count, nil
 }
-
-// GetChannelHashcashBits returns the hashcash difficulty
-// requirement for a channel. Returns 0 if not set.
-func (database *Database) GetChannelHashcashBits(
-	ctx context.Context,
-	channelID int64,
-) (int, error) {
-	var bits int
-
-	err := database.conn.QueryRowContext(
-		ctx,
-		"SELECT hashcash_bits FROM channels WHERE id = ?",
-		channelID,
-	).Scan(&bits)
-	if err != nil {
-		return 0, fmt.Errorf(
-			"get channel hashcash bits: %w", err,
-		)
-	}
-
-	return bits, nil
-}
-
-// SetChannelHashcashBits sets the hashcash difficulty
-// requirement for a channel. A value of 0 disables the
-// requirement.
-func (database *Database) SetChannelHashcashBits(
-	ctx context.Context,
-	channelID int64,
-	bits int,
-) error {
-	_, err := database.conn.ExecContext(ctx,
-		`UPDATE channels
-		 SET hashcash_bits = ?, updated_at = ?
-		 WHERE id = ?`,
-		bits, time.Now(), channelID)
-	if err != nil {
-		return fmt.Errorf(
-			"set channel hashcash bits: %w", err,
-		)
-	}
-
-	return nil
-}
-
-// RecordSpentHashcash stores a spent hashcash stamp hash
-// for replay prevention.
-func (database *Database) RecordSpentHashcash(
-	ctx context.Context,
-	stampHash string,
-) error {
-	_, err := database.conn.ExecContext(ctx,
-		`INSERT OR IGNORE INTO spent_hashcash
-		 (stamp_hash, created_at)
-		 VALUES (?, ?)`,
-		stampHash, time.Now())
-	if err != nil {
-		return fmt.Errorf(
-			"record spent hashcash: %w", err,
-		)
-	}
-
-	return nil
-}
-
-// IsHashcashSpent checks whether a hashcash stamp hash
-// has already been used.
-func (database *Database) IsHashcashSpent(
-	ctx context.Context,
-	stampHash string,
-) (bool, error) {
-	var count int
-
-	err := database.conn.QueryRowContext(ctx,
-		`SELECT COUNT(*) FROM spent_hashcash
-		 WHERE stamp_hash = ?`,
-		stampHash,
-	).Scan(&count)
-	if err != nil {
-		return false, fmt.Errorf(
-			"check spent hashcash: %w", err,
-		)
-	}
-
-	return count > 0, nil
-}
-
-// PruneSpentHashcash deletes spent hashcash tokens older
-// than the cutoff and returns the number of rows removed.
-func (database *Database) PruneSpentHashcash(
-	ctx context.Context,
-	cutoff time.Time,
-) (int64, error) {
-	res, err := database.conn.ExecContext(ctx,
-		"DELETE FROM spent_hashcash WHERE created_at < ?",
-		cutoff,
-	)
-	if err != nil {
-		return 0, fmt.Errorf(
-			"prune spent hashcash: %w", err,
-		)
-	}
-
-	deleted, _ := res.RowsAffected()
-
-	return deleted, nil
-}

internal/db/schema/001_initial.sql

@@ -33,7 +33,6 @@ CREATE TABLE IF NOT EXISTS channels (
     topic TEXT NOT NULL DEFAULT '',
     topic_set_by TEXT NOT NULL DEFAULT '',
     topic_set_at DATETIME,
-    hashcash_bits INTEGER NOT NULL DEFAULT 0,
     created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
     updated_at DATETIME DEFAULT CURRENT_TIMESTAMP
 );
@@ -62,14 +61,6 @@ CREATE TABLE IF NOT EXISTS messages (
 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);
 
--- Spent hashcash tokens for replay prevention (1-year TTL)
-CREATE TABLE IF NOT EXISTS spent_hashcash (
-    id INTEGER PRIMARY KEY AUTOINCREMENT,
-    stamp_hash TEXT NOT NULL UNIQUE,
-    created_at DATETIME DEFAULT CURRENT_TIMESTAMP
-);
-CREATE INDEX IF NOT EXISTS idx_spent_hashcash_created ON spent_hashcash(created_at);
-
 -- Per-client message queues for fan-out delivery
 CREATE TABLE IF NOT EXISTS client_queues (
     id INTEGER PRIMARY KEY AUTOINCREMENT,

internal/handlers/api.go

@@ -3,7 +3,6 @@ package handlers
 import (
 	"context"
 	"encoding/json"
-	"errors"
 	"fmt"
 	"net/http"
 	"regexp"
@@ -12,16 +11,10 @@ import (
 	"time"
 
 	"git.eeqj.de/sneak/neoirc/internal/db"
-	"git.eeqj.de/sneak/neoirc/internal/hashcash"
 	"git.eeqj.de/sneak/neoirc/pkg/irc"
 	"github.com/go-chi/chi/v5"
 )
 
-var (
-	errHashcashRequired = errors.New("hashcash required")
-	errHashcashReused   = errors.New("hashcash reused")
-)
-
 var validNickRe = regexp.MustCompile(
 	`^[a-zA-Z_][a-zA-Z0-9_\-\[\]\\^{}|` + "`" + `]{0,31}$`,
 )
@@ -36,7 +29,6 @@ const (
 	defaultMaxBodySize = 4096
 	defaultHistLimit   = 50
 	maxHistLimit       = 500
-	authCookieName     = "neoirc_auth"
 )
 
 func (hdlr *Handlers) maxBodySize() int64 {
@@ -47,18 +39,23 @@ func (hdlr *Handlers) maxBodySize() int64 {
 	return defaultMaxBodySize
 }
 
-// authSession extracts the session from the auth cookie.
+// authSession extracts the session from the client token.
 func (hdlr *Handlers) authSession(
 	request *http.Request,
 ) (int64, int64, string, error) {
-	cookie, err := request.Cookie(authCookieName)
-	if err != nil || cookie.Value == "" {
+	auth := request.Header.Get("Authorization")
+	if !strings.HasPrefix(auth, "Bearer ") {
+		return 0, 0, "", errUnauthorized
+	}
+
+	token := strings.TrimPrefix(auth, "Bearer ")
+	if token == "" {
 		return 0, 0, "", errUnauthorized
 	}
 
 	sessionID, clientID, nick, err :=
 		hdlr.params.Database.GetSessionByToken(
-			request.Context(), cookie.Value,
+			request.Context(), token,
 		)
 	if err != nil {
 		return 0, 0, "", fmt.Errorf("auth: %w", err)
@@ -67,46 +64,6 @@ func (hdlr *Handlers) authSession(
 	return sessionID, clientID, nick, nil
 }
 
-// setAuthCookie sets the authentication cookie on the
-// response.
-func (hdlr *Handlers) setAuthCookie(
-	writer http.ResponseWriter,
-	request *http.Request,
-	token string,
-) {
-	secure := request.TLS != nil ||
-		request.Header.Get("X-Forwarded-Proto") == "https"
-
-	http.SetCookie(writer, &http.Cookie{ //nolint:exhaustruct // optional fields
-		Name:     authCookieName,
-		Value:    token,
-		Path:     "/",
-		HttpOnly: true,
-		Secure:   secure,
-		SameSite: http.SameSiteStrictMode,
-	})
-}
-
-// clearAuthCookie removes the authentication cookie from
-// the client.
-func (hdlr *Handlers) clearAuthCookie(
-	writer http.ResponseWriter,
-	request *http.Request,
-) {
-	secure := request.TLS != nil ||
-		request.Header.Get("X-Forwarded-Proto") == "https"
-
-	http.SetCookie(writer, &http.Cookie{ //nolint:exhaustruct // optional fields
-		Name:     authCookieName,
-		Value:    "",
-		Path:     "/",
-		HttpOnly: true,
-		Secure:   secure,
-		SameSite: http.SameSiteStrictMode,
-		MaxAge:   -1,
-	})
-}
-
 func (hdlr *Handlers) requireAuth(
 	writer http.ResponseWriter,
 	request *http.Request,
@@ -131,11 +88,10 @@ func (hdlr *Handlers) fanOut(
 	request *http.Request,
 	command, from, target string,
 	body json.RawMessage,
-	meta json.RawMessage,
 	sessionIDs []int64,
 ) (string, error) {
 	dbID, msgUUID, err := hdlr.params.Database.InsertMessage(
-		request.Context(), command, from, target, nil, body, meta,
+		request.Context(), command, from, target, nil, body, nil,
 	)
 	if err != nil {
 		return "", fmt.Errorf("insert message: %w", err)
@@ -161,11 +117,10 @@ func (hdlr *Handlers) fanOutSilent(
 	request *http.Request,
 	command, from, target string,
 	body json.RawMessage,
-	meta json.RawMessage,
 	sessionIDs []int64,
 ) error {
 	_, err := hdlr.fanOut(
-		request, command, from, target, body, meta, sessionIDs,
+		request, command, from, target, body, sessionIDs,
 	)
 
 	return err
@@ -262,11 +217,10 @@ func (hdlr *Handlers) handleCreateSession(
 
 	hdlr.deliverMOTD(request, clientID, sessionID, payload.Nick)
 
-	hdlr.setAuthCookie(writer, request, token)
-
 	hdlr.respondJSON(writer, request, map[string]any{
 		"id":    sessionID,
 		"nick":  payload.Nick,
+		"token": token,
 	}, http.StatusCreated)
 }
 
@@ -340,7 +294,7 @@ func (hdlr *Handlers) deliverWelcome(
 		[]string{
 			"CHANTYPES=#",
 			"NICKLEN=32",
-			"CHANMODES=,,H," + "imnst",
+			"CHANMODES=,,," + "imnst",
 			"NETWORK=neoirc",
 			"CASEMAPPING=ascii",
 		},
@@ -871,7 +825,7 @@ func (hdlr *Handlers) HandleSendCommand() http.HandlerFunc {
 			writer, request,
 			sessionID, clientID, nick,
 			payload.Command, payload.To,
-			payload.Body, payload.Meta, bodyLines,
+			payload.Body, bodyLines,
 		)
 	}
 }
@@ -882,7 +836,6 @@ func (hdlr *Handlers) dispatchCommand(
 	sessionID, clientID int64,
 	nick, command, target string,
 	body json.RawMessage,
-	meta json.RawMessage,
 	bodyLines func() []string,
 ) {
 	switch command {
@@ -895,7 +848,7 @@ func (hdlr *Handlers) dispatchCommand(
 		hdlr.handlePrivmsg(
 			writer, request,
 			sessionID, clientID, nick,
-			command, target, body, meta, bodyLines,
+			command, target, body, bodyLines,
 		)
 	case irc.CmdJoin:
 		hdlr.handleJoin(
@@ -912,11 +865,6 @@ func (hdlr *Handlers) dispatchCommand(
 			writer, request,
 			sessionID, clientID, nick, bodyLines,
 		)
-	case irc.CmdPass:
-		hdlr.handlePass(
-			writer, request,
-			sessionID, clientID, nick, bodyLines,
-		)
 	case irc.CmdTopic:
 		hdlr.handleTopic(
 			writer, request,
@@ -1001,7 +949,6 @@ func (hdlr *Handlers) handlePrivmsg(
 	sessionID, clientID int64,
 	nick, command, target string,
 	body json.RawMessage,
-	meta json.RawMessage,
 	bodyLines func() []string,
 ) {
 	if target == "" {
@@ -1039,7 +986,7 @@ func (hdlr *Handlers) handlePrivmsg(
 		hdlr.handleChannelMsg(
 			writer, request,
 			sessionID, clientID, nick,
-			command, target, body, meta,
+			command, target, body,
 		)
 
 		return
@@ -1048,7 +995,7 @@ func (hdlr *Handlers) handlePrivmsg(
 	hdlr.handleDirectMsg(
 		writer, request,
 		sessionID, clientID, nick,
-		command, target, body, meta,
+		command, target, body,
 	)
 }
 
@@ -1079,7 +1026,6 @@ func (hdlr *Handlers) handleChannelMsg(
 	sessionID, clientID int64,
 	nick, command, target string,
 	body json.RawMessage,
-	meta json.RawMessage,
 ) {
 	chID, err := hdlr.params.Database.GetChannelByName(
 		request.Context(), target,
@@ -1120,180 +1066,16 @@ func (hdlr *Handlers) handleChannelMsg(
 		return
 	}
 
-	hashcashErr := hdlr.validateChannelHashcash(
-		request, clientID, sessionID,
-		writer, nick, target, body, meta, chID,
-	)
-	if hashcashErr != nil {
-		return
-	}
-
 	hdlr.sendChannelMsg(
-		writer, request, command, nick, target,
-		body, meta, chID,
+		writer, request, command, nick, target, body, chID,
 	)
 }
 
-// validateChannelHashcash checks whether the channel
-// requires hashcash proof-of-work for messages and
-// validates the stamp from the message meta field.
-// Returns nil on success or if the channel has no
-// hashcash requirement. On failure, it sends the
-// appropriate IRC error and returns a non-nil error.
-func (hdlr *Handlers) validateChannelHashcash(
-	request *http.Request,
-	clientID, sessionID int64,
-	writer http.ResponseWriter,
-	nick, target string,
-	body json.RawMessage,
-	meta json.RawMessage,
-	chID int64,
-) error {
-	ctx := request.Context()
-
-	bits, bitsErr := hdlr.params.Database.GetChannelHashcashBits(
-		ctx, chID,
-	)
-	if bitsErr != nil {
-		hdlr.log.Error(
-			"get channel hashcash bits", "error", bitsErr,
-		)
-		hdlr.respondError(
-			writer, request,
-			"internal error",
-			http.StatusInternalServerError,
-		)
-
-		return fmt.Errorf("channel hashcash bits: %w", bitsErr)
-	}
-
-	if bits <= 0 {
-		return nil
-	}
-
-	stamp := hdlr.extractHashcashFromMeta(meta)
-	if stamp == "" {
-		hdlr.respondIRCError(
-			writer, request, clientID, sessionID,
-			irc.ErrCannotSendToChan, nick, []string{target},
-			"Channel requires hashcash proof-of-work",
-		)
-
-		return errHashcashRequired
-	}
-
-	return hdlr.verifyChannelStamp(
-		request, writer,
-		clientID, sessionID,
-		nick, target, body, stamp, bits,
-	)
-}
-
-// verifyChannelStamp validates a channel hashcash stamp
-// and checks for replay attacks.
-func (hdlr *Handlers) verifyChannelStamp(
-	request *http.Request,
-	writer http.ResponseWriter,
-	clientID, sessionID int64,
-	nick, target string,
-	body json.RawMessage,
-	stamp string,
-	bits int,
-) error {
-	ctx := request.Context()
-	bodyHashStr := hashcash.BodyHash(body)
-
-	valErr := hdlr.channelHashcash.ValidateStamp(
-		stamp, bits, target, bodyHashStr,
-	)
-	if valErr != nil {
-		hdlr.respondIRCError(
-			writer, request, clientID, sessionID,
-			irc.ErrCannotSendToChan, nick, []string{target},
-			"Invalid hashcash: "+valErr.Error(),
-		)
-
-		return fmt.Errorf("channel hashcash: %w", valErr)
-	}
-
-	stampKey := hashcash.StampHash(stamp)
-
-	spent, spentErr := hdlr.params.Database.IsHashcashSpent(
-		ctx, stampKey,
-	)
-	if spentErr != nil {
-		hdlr.log.Error(
-			"check spent hashcash", "error", spentErr,
-		)
-		hdlr.respondError(
-			writer, request,
-			"internal error",
-			http.StatusInternalServerError,
-		)
-
-		return fmt.Errorf("check spent hashcash: %w", spentErr)
-	}
-
-	if spent {
-		hdlr.respondIRCError(
-			writer, request, clientID, sessionID,
-			irc.ErrCannotSendToChan, nick, []string{target},
-			"Hashcash stamp already used",
-		)
-
-		return errHashcashReused
-	}
-
-	recordErr := hdlr.params.Database.RecordSpentHashcash(
-		ctx, stampKey,
-	)
-	if recordErr != nil {
-		hdlr.log.Error(
-			"record spent hashcash", "error", recordErr,
-		)
-	}
-
-	return nil
-}
-
-// extractHashcashFromMeta parses the meta JSON and
-// returns the hashcash stamp string, or empty string
-// if not present.
-func (hdlr *Handlers) extractHashcashFromMeta(
-	meta json.RawMessage,
-) string {
-	if len(meta) == 0 {
-		return ""
-	}
-
-	var metaMap map[string]json.RawMessage
-
-	err := json.Unmarshal(meta, &metaMap)
-	if err != nil {
-		return ""
-	}
-
-	raw, ok := metaMap["hashcash"]
-	if !ok {
-		return ""
-	}
-
-	var stamp string
-
-	err = json.Unmarshal(raw, &stamp)
-	if err != nil {
-		return ""
-	}
-
-	return stamp
-}
-
 func (hdlr *Handlers) sendChannelMsg(
 	writer http.ResponseWriter,
 	request *http.Request,
 	command, nick, target string,
 	body json.RawMessage,
-	meta json.RawMessage,
 	chID int64,
 ) {
 	memberIDs, err := hdlr.params.Database.GetChannelMemberIDs(
@@ -1313,7 +1095,7 @@ func (hdlr *Handlers) sendChannelMsg(
 	}
 
 	msgUUID, err := hdlr.fanOut(
-		request, command, nick, target, body, meta, memberIDs,
+		request, command, nick, target, body, memberIDs,
 	)
 	if err != nil {
 		hdlr.log.Error("send message failed", "error", err)
@@ -1337,7 +1119,6 @@ func (hdlr *Handlers) handleDirectMsg(
 	sessionID, clientID int64,
 	nick, command, target string,
 	body json.RawMessage,
-	meta json.RawMessage,
 ) {
 	targetSID, err := hdlr.params.Database.GetSessionByNick(
 		request.Context(), target,
@@ -1362,7 +1143,7 @@ func (hdlr *Handlers) handleDirectMsg(
 	}
 
 	msgUUID, err := hdlr.fanOut(
-		request, command, nick, target, body, meta, recipients,
+		request, command, nick, target, body, recipients,
 	)
 	if err != nil {
 		hdlr.log.Error("send dm failed", "error", err)
@@ -1473,7 +1254,7 @@ func (hdlr *Handlers) executeJoin(
 	)
 
 	_ = hdlr.fanOutSilent(
-		request, irc.CmdJoin, nick, channel, nil, nil, memberIDs,
+		request, irc.CmdJoin, nick, channel, nil, memberIDs,
 	)
 
 	hdlr.deliverJoinNumerics(
@@ -1643,7 +1424,7 @@ func (hdlr *Handlers) handlePart(
 	)
 
 	_ = hdlr.fanOutSilent(
-		request, irc.CmdPart, nick, channel, body, nil, memberIDs,
+		request, irc.CmdPart, nick, channel, body, memberIDs,
 	)
 
 	err = hdlr.params.Database.PartChannel(
@@ -1923,7 +1704,7 @@ func (hdlr *Handlers) executeTopic(
 	)
 
 	_ = hdlr.fanOutSilent(
-		request, irc.CmdTopic, nick, channel, body, nil, memberIDs,
+		request, irc.CmdTopic, nick, channel, body, memberIDs,
 	)
 
 	hdlr.enqueueNumeric(
@@ -2047,8 +1828,6 @@ func (hdlr *Handlers) handleQuit(
 		request.Context(), sessionID,
 	)
 
-	hdlr.clearAuthCookie(writer, request)
-
 	hdlr.respondJSON(writer, request,
 		map[string]string{"status": "quit"},
 		http.StatusOK)
@@ -2088,10 +1867,11 @@ func (hdlr *Handlers) handleMode(
 		return
 	}
 
+	_ = bodyLines
+
 	hdlr.handleChannelMode(
 		writer, request,
 		sessionID, clientID, nick, channel,
-		bodyLines,
 	)
 }
 
@@ -2100,7 +1880,6 @@ func (hdlr *Handlers) handleChannelMode(
 	request *http.Request,
 	sessionID, clientID int64,
 	nick, channel string,
-	bodyLines func() []string,
 ) {
 	ctx := request.Context()
 
@@ -2117,47 +1896,10 @@ func (hdlr *Handlers) handleChannelMode(
 		return
 	}
 
-	lines := bodyLines()
-	if len(lines) > 0 {
-		hdlr.applyChannelMode(
-			writer, request,
-			sessionID, clientID, nick,
-			channel, chID, lines,
-		)
-
-		return
-	}
-
-	hdlr.queryChannelMode(
-		writer, request,
-		sessionID, clientID, nick, channel, chID,
-	)
-}
-
-// queryChannelMode sends RPL_CHANNELMODEIS and
-// RPL_CREATIONTIME for a channel. Includes +H if
-// the channel has a hashcash requirement.
-func (hdlr *Handlers) queryChannelMode(
-	writer http.ResponseWriter,
-	request *http.Request,
-	sessionID, clientID int64,
-	nick, channel string,
-	chID int64,
-) {
-	ctx := request.Context()
-
-	modeStr := "+n"
-
-	bits, bitsErr := hdlr.params.Database.
-		GetChannelHashcashBits(ctx, chID)
-	if bitsErr == nil && bits > 0 {
-		modeStr = fmt.Sprintf("+nH %d", bits)
-	}
-
 	// 324 RPL_CHANNELMODEIS
 	hdlr.enqueueNumeric(
 		ctx, clientID, irc.RplChannelModeIs, nick,
-		[]string{channel, modeStr}, "",
+		[]string{channel, "+n"}, "",
 	)
 
 	// 329 RPL_CREATIONTIME
@@ -2182,156 +1924,6 @@ func (hdlr *Handlers) queryChannelMode(
 		http.StatusOK)
 }
 
-// applyChannelMode handles setting channel modes.
-// Currently supports +H/-H for hashcash bits.
-func (hdlr *Handlers) applyChannelMode(
-	writer http.ResponseWriter,
-	request *http.Request,
-	sessionID, clientID int64,
-	nick, channel string,
-	chID int64,
-	modeArgs []string,
-) {
-	ctx := request.Context()
-	modeStr := modeArgs[0]
-
-	switch modeStr {
-	case "+H":
-		hdlr.setHashcashMode(
-			writer, request,
-			sessionID, clientID, nick,
-			channel, chID, modeArgs,
-		)
-	case "-H":
-		hdlr.clearHashcashMode(
-			writer, request,
-			sessionID, clientID, nick,
-			channel, chID,
-		)
-	default:
-		// Unknown or unsupported mode change.
-		hdlr.enqueueNumeric(
-			ctx, clientID, irc.ErrUnknownMode, nick,
-			[]string{modeStr},
-			"is unknown mode char to me",
-		)
-		hdlr.broker.Notify(sessionID)
-		hdlr.respondJSON(writer, request,
-			map[string]string{"status": "error"},
-			http.StatusOK)
-	}
-}
-
-const (
-	// minHashcashBits is the minimum allowed hashcash
-	// difficulty for channels.
-	minHashcashBits = 1
-	// maxHashcashBits is the maximum allowed hashcash
-	// difficulty for channels.
-	maxHashcashBits = 40
-)
-
-// setHashcashMode handles MODE #channel +H <bits>.
-func (hdlr *Handlers) setHashcashMode(
-	writer http.ResponseWriter,
-	request *http.Request,
-	sessionID, clientID int64,
-	nick, channel string,
-	chID int64,
-	modeArgs []string,
-) {
-	ctx := request.Context()
-
-	if len(modeArgs) < 2 { //nolint:mnd // +H requires a bits arg
-		hdlr.respondIRCError(
-			writer, request, clientID, sessionID,
-			irc.ErrNeedMoreParams, nick, []string{irc.CmdMode},
-			"Not enough parameters (+H requires bits)",
-		)
-
-		return
-	}
-
-	bits, err := strconv.Atoi(modeArgs[1])
-	if err != nil || bits < minHashcashBits ||
-		bits > maxHashcashBits {
-		hdlr.respondIRCError(
-			writer, request, clientID, sessionID,
-			irc.ErrUnknownMode, nick, []string{"+H"},
-			fmt.Sprintf(
-				"Invalid hashcash bits (must be %d-%d)",
-				minHashcashBits, maxHashcashBits,
-			),
-		)
-
-		return
-	}
-
-	err = hdlr.params.Database.SetChannelHashcashBits(
-		ctx, chID, bits,
-	)
-	if err != nil {
-		hdlr.log.Error(
-			"set channel hashcash bits", "error", err,
-		)
-		hdlr.respondError(
-			writer, request,
-			"internal error",
-			http.StatusInternalServerError,
-		)
-
-		return
-	}
-
-	hdlr.enqueueNumeric(
-		ctx, clientID, irc.RplChannelModeIs, nick,
-		[]string{
-			channel,
-			fmt.Sprintf("+H %d", bits),
-		}, "",
-	)
-	hdlr.broker.Notify(sessionID)
-	hdlr.respondJSON(writer, request,
-		map[string]string{"status": "ok"},
-		http.StatusOK)
-}
-
-// clearHashcashMode handles MODE #channel -H.
-func (hdlr *Handlers) clearHashcashMode(
-	writer http.ResponseWriter,
-	request *http.Request,
-	sessionID, clientID int64,
-	nick, channel string,
-	chID int64,
-) {
-	ctx := request.Context()
-
-	err := hdlr.params.Database.SetChannelHashcashBits(
-		ctx, chID, 0,
-	)
-	if err != nil {
-		hdlr.log.Error(
-			"clear channel hashcash bits", "error", err,
-		)
-		hdlr.respondError(
-			writer, request,
-			"internal error",
-			http.StatusInternalServerError,
-		)
-
-		return
-	}
-
-	hdlr.enqueueNumeric(
-		ctx, clientID, irc.RplChannelModeIs, nick,
-		[]string{channel, "+n"}, "",
-	)
-	hdlr.broker.Notify(sessionID)
-	hdlr.respondJSON(writer, request,
-		map[string]string{"status": "ok"},
-		http.StatusOK)
-}
-
 // handleNames sends NAMES reply for a channel.
 func (hdlr *Handlers) handleNames(
 	writer http.ResponseWriter,
@@ -2851,8 +2443,6 @@ func (hdlr *Handlers) HandleLogout() http.HandlerFunc {
 			)
 		}
 
-		hdlr.clearAuthCookie(writer, request)
-
 		hdlr.respondJSON(writer, request,
 			map[string]string{"status": "ok"},
 			http.StatusOK)

internal/handlers/api_test.go

@@ -22,7 +22,6 @@ import (
 	"git.eeqj.de/sneak/neoirc/internal/db"
 	"git.eeqj.de/sneak/neoirc/internal/globals"
 	"git.eeqj.de/sneak/neoirc/internal/handlers"
-	"git.eeqj.de/sneak/neoirc/internal/hashcash"
 	"git.eeqj.de/sneak/neoirc/internal/healthcheck"
 	"git.eeqj.de/sneak/neoirc/internal/logger"
 	"git.eeqj.de/sneak/neoirc/internal/middleware"
@@ -42,7 +41,6 @@ const (
 	apiMessages = "/api/v1/messages"
 	apiSession  = "/api/v1/session"
 	apiState    = "/api/v1/state"
-	authCookieName = "neoirc_auth"
 )
 
 // testServer wraps a test HTTP server with helpers.
@@ -262,7 +260,7 @@ func doRequest(
 
 func doRequestAuth(
 	t *testing.T,
-	method, url, cookie string,
+	method, url, token string,
 	body io.Reader,
 ) (*http.Response, error) {
 	t.Helper()
@@ -280,11 +278,10 @@ func doRequestAuth(
 		)
 	}
 
-	if cookie != "" {
-		request.AddCookie(&http.Cookie{ //nolint:exhaustruct // only name+value needed
-			Name:  authCookieName,
-			Value: cookie,
-		})
+	if token != "" {
+		request.Header.Set(
+			"Authorization", "Bearer "+token,
+		)
 	}
 
 	resp, err := http.DefaultClient.Do(request)
@@ -327,19 +324,17 @@ func (tserver *testServer) createSession(
 		)
 	}
 
-	// Drain the body.
-	_, _ = io.ReadAll(resp.Body)
-
-	// Extract auth cookie from response.
-	for _, cookie := range resp.Cookies() {
-		if cookie.Name == authCookieName {
-			return cookie.Value
-		}
+	var result struct {
+		ID    int64  `json:"id"`
+		Token string `json:"token"`
 	}
 
-	tserver.t.Fatal("no auth cookie in response")
+	decErr := json.NewDecoder(resp.Body).Decode(&result)
+	if decErr != nil {
+		tserver.t.Fatalf("decode session: %v", decErr)
+	}
 
-	return ""
+	return result.Token
 }
 
 func (tserver *testServer) sendCommand(
@@ -496,10 +491,10 @@ func findNumeric(
 
 func TestCreateSessionValid(t *testing.T) {
 	tserver := newTestServer(t)
-	cookie := tserver.createSession("alice")
+	token := tserver.createSession("alice")
 
-	if cookie == "" {
-		t.Fatal("expected auth cookie")
+	if token == "" {
+		t.Fatal("expected token")
 	}
 }
 
@@ -621,7 +616,7 @@ func TestCreateSessionMalformed(t *testing.T) {
 	}
 }
 
-func TestAuthNoCookie(t *testing.T) {
+func TestAuthNoHeader(t *testing.T) {
 	tserver := newTestServer(t)
 
 	status, _ := tserver.getState("")
@@ -630,11 +625,11 @@ func TestAuthNoCookie(t *testing.T) {
 	}
 }
 
-func TestAuthBadCookie(t *testing.T) {
+func TestAuthBadToken(t *testing.T) {
 	tserver := newTestServer(t)
 
 	status, _ := tserver.getState(
-		"invalid-cookie-12345",
+		"invalid-token-12345",
 	)
 	if status != http.StatusUnauthorized {
 		t.Fatalf("expected 401, got %d", status)
@@ -1831,6 +1826,90 @@ func assertFieldGTE(
 	}
 }
 
+func TestRegisterValid(t *testing.T) {
+	tserver := newTestServer(t)
+
+	body, err := json.Marshal(map[string]string{
+		"nick": "reguser", "password": "password123",
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	resp, err := doRequest(
+		t,
+		http.MethodPost,
+		tserver.url("/api/v1/register"),
+		bytes.NewReader(body),
+	)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	defer func() { _ = resp.Body.Close() }()
+
+	if resp.StatusCode != http.StatusCreated {
+		respBody, _ := io.ReadAll(resp.Body)
+		t.Fatalf(
+			"expected 201, got %d: %s",
+			resp.StatusCode, respBody,
+		)
+	}
+
+	var result map[string]any
+
+	_ = json.NewDecoder(resp.Body).Decode(&result)
+
+	if result["token"] == nil || result["token"] == "" {
+		t.Fatal("expected token in response")
+	}
+
+	if result["nick"] != "reguser" {
+		t.Fatalf(
+			"expected reguser, got %v", result["nick"],
+		)
+	}
+}
+
+func TestRegisterDuplicate(t *testing.T) {
+	tserver := newTestServer(t)
+
+	body, err := json.Marshal(map[string]string{
+		"nick": "dupuser", "password": "password123",
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	resp, err := doRequest(
+		t,
+		http.MethodPost,
+		tserver.url("/api/v1/register"),
+		bytes.NewReader(body),
+	)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	_ = resp.Body.Close()
+
+	resp2, err := doRequest(
+		t,
+		http.MethodPost,
+		tserver.url("/api/v1/register"),
+		bytes.NewReader(body),
+	)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	defer func() { _ = resp2.Body.Close() }()
+
+	if resp2.StatusCode != http.StatusConflict {
+		t.Fatalf("expected 409, got %d", resp2.StatusCode)
+	}
+}
+
 func postJSONExpectStatus(
 	t *testing.T,
 	tserver *testServer,
@@ -1865,102 +1944,36 @@ func postJSONExpectStatus(
 	}
 }
 
-func TestPassCommand(t *testing.T) {
+func TestRegisterShortPassword(t *testing.T) {
 	tserver := newTestServer(t)
-	token := tserver.createSession("passuser")
 
-	// Drain initial messages.
-	_, _ = tserver.pollMessages(token, 0)
-
-	// Set password via PASS command.
-	status, result := tserver.sendCommand(
-		token,
-		map[string]any{
-			commandKey: "PASS",
-			bodyKey:    []string{"s3cure_pass"},
+	postJSONExpectStatus(
+		t, tserver, "/api/v1/register",
+		map[string]string{
+			"nick": "shortpw", "password": "short",
 		},
+		http.StatusBadRequest,
 	)
-	if status != http.StatusOK {
-		t.Fatalf(
-			"expected 200, got %d: %v", status, result,
-		)
-	}
-
-	if result[statusKey] != "ok" {
-		t.Fatalf(
-			"expected ok, got %v", result[statusKey],
-		)
-	}
 }
 
-func TestPassCommandShortPassword(t *testing.T) {
+func TestRegisterInvalidNick(t *testing.T) {
 	tserver := newTestServer(t)
-	token := tserver.createSession("shortpw")
 
-	// Drain initial messages.
-	_, lastID := tserver.pollMessages(token, 0)
-
-	// Try short password — should fail.
-	status, _ := tserver.sendCommand(
-		token,
-		map[string]any{
-			commandKey: "PASS",
-			bodyKey:    []string{"short"},
+	postJSONExpectStatus(
+		t, tserver, "/api/v1/register",
+		map[string]string{
+			"nick":     "bad nick!",
+			"password": "password123",
 		},
+		http.StatusBadRequest,
 	)
-	if status != http.StatusOK {
-		t.Fatalf("expected 200, got %d", status)
-	}
-
-	msgs, _ := tserver.pollMessages(token, lastID)
-
-	if !findNumeric(msgs, "461") {
-		t.Fatalf(
-			"expected ERR_NEEDMOREPARAMS (461), got %v",
-			msgs,
-		)
-	}
-}
-
-func TestPassCommandEmpty(t *testing.T) {
-	tserver := newTestServer(t)
-	token := tserver.createSession("emptypw")
-
-	// Drain initial messages.
-	_, lastID := tserver.pollMessages(token, 0)
-
-	// Try empty password — should fail.
-	status, _ := tserver.sendCommand(
-		token,
-		map[string]any{commandKey: "PASS"},
-	)
-	if status != http.StatusOK {
-		t.Fatalf("expected 200, got %d", status)
-	}
-
-	msgs, _ := tserver.pollMessages(token, lastID)
-
-	if !findNumeric(msgs, "461") {
-		t.Fatalf(
-			"expected ERR_NEEDMOREPARAMS (461), got %v",
-			msgs,
-		)
-	}
 }
 
 func TestLoginValid(t *testing.T) {
 	tserver := newTestServer(t)
 
-	// Create session and set password via PASS command.
-	token := tserver.createSession("loginuser")
-
-	tserver.sendCommand(token, map[string]any{
-		commandKey: "PASS",
-		bodyKey:    []string{"password123"},
-	})
-
-	// Login with nick + password.
-	loginBody, err := json.Marshal(map[string]string{
+	// Register first.
+	regBody, err := json.Marshal(map[string]string{
 		"nick": "loginuser", "password": "password123",
 	})
 	if err != nil {
@@ -1968,6 +1981,26 @@ func TestLoginValid(t *testing.T) {
 	}
 
 	resp, err := doRequest(
+		t,
+		http.MethodPost,
+		tserver.url("/api/v1/register"),
+		bytes.NewReader(regBody),
+	)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	_ = resp.Body.Close()
+
+	// Login.
+	loginBody, err := json.Marshal(map[string]string{
+		"nick": "loginuser", "password": "password123",
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	resp2, err := doRequest(
 		t,
 		http.MethodPost,
 		tserver.url("/api/v1/login"),
@@ -1977,33 +2010,31 @@ func TestLoginValid(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	defer func() { _ = resp.Body.Close() }()
+	defer func() { _ = resp2.Body.Close() }()
 
-	if resp.StatusCode != http.StatusOK {
-		respBody, _ := io.ReadAll(resp.Body)
+	if resp2.StatusCode != http.StatusOK {
+		respBody, _ := io.ReadAll(resp2.Body)
 		t.Fatalf(
 			"expected 200, got %d: %s",
-			resp.StatusCode, respBody,
+			resp2.StatusCode, respBody,
 		)
 	}
 
-	// Extract auth cookie from login response.
-	var loginCookie string
+	var result map[string]any
 
-	for _, cookie := range resp.Cookies() {
-		if cookie.Name == authCookieName {
-			loginCookie = cookie.Value
+	_ = json.NewDecoder(resp2.Body).Decode(&result)
 
-			break
-		}
+	if result["token"] == nil || result["token"] == "" {
+		t.Fatal("expected token in response")
 	}
 
-	if loginCookie == "" {
-		t.Fatal("expected auth cookie from login")
+	// Verify token works.
+	token, ok := result["token"].(string)
+	if !ok {
+		t.Fatal("token not a string")
 	}
 
-	// Verify login cookie works for auth.
-	status, state := tserver.getState(loginCookie)
+	status, state := tserver.getState(token)
 	if status != http.StatusOK {
 		t.Fatalf("expected 200, got %d", status)
 	}
@@ -2019,22 +2050,49 @@ func TestLoginValid(t *testing.T) {
 func TestLoginWrongPassword(t *testing.T) {
 	tserver := newTestServer(t)
 
-	// Create session and set password via PASS command.
-	token := tserver.createSession("wrongpwuser")
-
-	tserver.sendCommand(token, map[string]any{
-		commandKey: "PASS",
-		bodyKey:    []string{"correctpass1"},
+	regBody, err := json.Marshal(map[string]string{
+		"nick": "wrongpwuser", "password": "correctpass1",
 	})
+	if err != nil {
+		t.Fatal(err)
+	}
 
-	postJSONExpectStatus(
-		t, tserver, "/api/v1/login",
-		map[string]string{
-			"nick":     "wrongpwuser",
-			"password": "wrongpass12",
-		},
-		http.StatusUnauthorized,
+	resp, err := doRequest(
+		t,
+		http.MethodPost,
+		tserver.url("/api/v1/register"),
+		bytes.NewReader(regBody),
 	)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	_ = resp.Body.Close()
+
+	loginBody, err := json.Marshal(map[string]string{
+		"nick": "wrongpwuser", "password": "wrongpass12",
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	resp2, err := doRequest(
+		t,
+		http.MethodPost,
+		tserver.url("/api/v1/login"),
+		bytes.NewReader(loginBody),
+	)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	defer func() { _ = resp2.Body.Close() }()
+
+	if resp2.StatusCode != http.StatusUnauthorized {
+		t.Fatalf(
+			"expected 401, got %d", resp2.StatusCode,
+		)
+	}
 }
 
 func TestLoginNonexistentUser(t *testing.T) {
@@ -2050,74 +2108,13 @@ func TestLoginNonexistentUser(t *testing.T) {
 	)
 }
 
-func TestSessionCookie(t *testing.T) {
-	tserver := newTestServer(t)
-
-	body, err := json.Marshal(
-		map[string]string{"nick": "cookietest"},
-	)
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	resp, err := doRequest(
-		t,
-		http.MethodPost,
-		tserver.url(apiSession),
-		bytes.NewReader(body),
-	)
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	defer func() { _ = resp.Body.Close() }()
-
-	if resp.StatusCode != http.StatusCreated {
-		t.Fatalf(
-			"expected 201, got %d", resp.StatusCode,
-		)
-	}
-
-	// Verify Set-Cookie header.
-	var authCookie *http.Cookie
-
-	for _, cookie := range resp.Cookies() {
-		if cookie.Name == authCookieName {
-			authCookie = cookie
-
-			break
-		}
-	}
-
-	if authCookie == nil {
-		t.Fatal("expected neoirc_auth cookie")
-	}
-
-	if !authCookie.HttpOnly {
-		t.Fatal("cookie should be HttpOnly")
-	}
-
-	if authCookie.SameSite != http.SameSiteStrictMode {
-		t.Fatal("cookie should be SameSite=Strict")
-	}
-
-	// Verify JSON body does NOT contain token.
-	var result map[string]any
-
-	_ = json.NewDecoder(resp.Body).Decode(&result)
-
-	if _, hasToken := result["token"]; hasToken {
-		t.Fatal("JSON body should not contain token")
-	}
-}
-
 func TestSessionStillWorks(t *testing.T) {
 	tserver := newTestServer(t)
 
 	// Verify anonymous session creation still works.
 	token := tserver.createSession("anon_user")
 	if token == "" {
-		t.Fatal("expected cookie for anonymous session")
+		t.Fatal("expected token for anonymous session")
 	}
 
 	status, state := tserver.getState(token)
@@ -2160,397 +2157,3 @@ func TestNickBroadcastToChannels(t *testing.T) {
 		)
 	}
 }
-
-// --- Channel Hashcash Tests ---
-
-const (
-	metaKey     = "meta"
-	modeCmd     = "MODE"
-	hashcashKey = "hashcash"
-)
-
-func mintTestChannelHashcash(
-	tb testing.TB,
-	bits int,
-	channel string,
-	body json.RawMessage,
-) string {
-	tb.Helper()
-
-	bodyHash := hashcash.BodyHash(body)
-
-	return hashcash.MintChannelStamp(bits, channel, bodyHash)
-}
-
-func TestChannelHashcashSetMode(t *testing.T) {
-	tserver := newTestServer(t)
-	token := tserver.createSession("hcmode_user")
-
-	tserver.sendCommand(token, map[string]any{
-		commandKey: joinCmd, toKey: "#hctest",
-	})
-
-	_, lastID := tserver.pollMessages(token, 0)
-
-	// Set hashcash bits to 2 via MODE +H.
-	status, _ := tserver.sendCommand(
-		token,
-		map[string]any{
-			commandKey: modeCmd,
-			toKey:      "#hctest",
-			bodyKey:    []string{"+H", "2"},
-		},
-	)
-	if status != http.StatusOK {
-		t.Fatalf("expected 200, got %d", status)
-	}
-
-	msgs, _ := tserver.pollMessages(token, lastID)
-
-	// Should get RPL_CHANNELMODEIS (324) confirming +H.
-	if !findNumeric(msgs, "324") {
-		t.Fatalf(
-			"expected RPL_CHANNELMODEIS (324), got %v",
-			msgs,
-		)
-	}
-}
-
-func TestChannelHashcashQueryMode(t *testing.T) {
-	tserver := newTestServer(t)
-	token := tserver.createSession("hcquery_user")
-
-	tserver.sendCommand(token, map[string]any{
-		commandKey: joinCmd, toKey: "#hcquery",
-	})
-
-	// Set hashcash bits.
-	tserver.sendCommand(token, map[string]any{
-		commandKey: modeCmd,
-		toKey:      "#hcquery",
-		bodyKey:    []string{"+H", "5"},
-	})
-
-	_, lastID := tserver.pollMessages(token, 0)
-
-	// Query mode — should show +nH.
-	tserver.sendCommand(token, map[string]any{
-		commandKey: modeCmd,
-		toKey:      "#hcquery",
-	})
-
-	msgs, _ := tserver.pollMessages(token, lastID)
-
-	found := false
-
-	for _, msg := range msgs {
-		code, ok := msg["code"].(float64)
-		if ok && int(code) == 324 {
-			found = true
-		}
-	}
-
-	if !found {
-		t.Fatalf(
-			"expected RPL_CHANNELMODEIS (324), got %v",
-			msgs,
-		)
-	}
-}
-
-func TestChannelHashcashClearMode(t *testing.T) {
-	tserver := newTestServer(t)
-	token := tserver.createSession("hcclear_user")
-
-	tserver.sendCommand(token, map[string]any{
-		commandKey: joinCmd, toKey: "#hcclear",
-	})
-
-	// Set hashcash bits.
-	tserver.sendCommand(token, map[string]any{
-		commandKey: modeCmd,
-		toKey:      "#hcclear",
-		bodyKey:    []string{"+H", "5"},
-	})
-
-	// Clear hashcash bits.
-	status, _ := tserver.sendCommand(token, map[string]any{
-		commandKey: modeCmd,
-		toKey:      "#hcclear",
-		bodyKey:    []string{"-H"},
-	})
-	if status != http.StatusOK {
-		t.Fatalf("expected 200, got %d", status)
-	}
-
-	// Now message should succeed without hashcash.
-	status, result := tserver.sendCommand(
-		token,
-		map[string]any{
-			commandKey: privmsgCmd,
-			toKey:      "#hcclear",
-			bodyKey:    []string{"test message"},
-		},
-	)
-	if status != http.StatusOK {
-		t.Fatalf(
-			"expected 200, got %d: %v", status, result,
-		)
-	}
-}
-
-func TestChannelHashcashRejectNoStamp(t *testing.T) {
-	tserver := newTestServer(t)
-	token := tserver.createSession("hcreject_user")
-
-	tserver.sendCommand(token, map[string]any{
-		commandKey: joinCmd, toKey: "#hcreject",
-	})
-
-	// Set hashcash requirement.
-	tserver.sendCommand(token, map[string]any{
-		commandKey: modeCmd,
-		toKey:      "#hcreject",
-		bodyKey:    []string{"+H", "2"},
-	})
-
-	_, lastID := tserver.pollMessages(token, 0)
-
-	// Send message without hashcash — should fail.
-	status, _ := tserver.sendCommand(
-		token,
-		map[string]any{
-			commandKey: privmsgCmd,
-			toKey:      "#hcreject",
-			bodyKey:    []string{"spam message"},
-		},
-	)
-	if status != http.StatusOK {
-		t.Fatalf("expected 200, got %d", status)
-	}
-
-	msgs, _ := tserver.pollMessages(token, lastID)
-
-	// Should get ERR_CANNOTSENDTOCHAN (404).
-	if !findNumeric(msgs, "404") {
-		t.Fatalf(
-			"expected ERR_CANNOTSENDTOCHAN (404), got %v",
-			msgs,
-		)
-	}
-}
-
-func TestChannelHashcashAcceptValidStamp(t *testing.T) {
-	tserver := newTestServer(t)
-	token := tserver.createSession("hcaccept_user")
-
-	tserver.sendCommand(token, map[string]any{
-		commandKey: joinCmd, toKey: "#hcaccept",
-	})
-
-	// Set hashcash requirement (2 bits = fast to mint).
-	tserver.sendCommand(token, map[string]any{
-		commandKey: modeCmd,
-		toKey:      "#hcaccept",
-		bodyKey:    []string{"+H", "2"},
-	})
-
-	_, lastID := tserver.pollMessages(token, 0)
-
-	// Mint a valid hashcash stamp.
-	msgBody, marshalErr := json.Marshal(
-		[]string{"hello world"},
-	)
-	if marshalErr != nil {
-		t.Fatal(marshalErr)
-	}
-
-	stamp := mintTestChannelHashcash(
-		t, 2, "#hcaccept", msgBody,
-	)
-
-	// Send message with valid hashcash.
-	status, result := tserver.sendCommand(
-		token,
-		map[string]any{
-			commandKey: privmsgCmd,
-			toKey:      "#hcaccept",
-			bodyKey:    []string{"hello world"},
-			metaKey: map[string]any{
-				hashcashKey: stamp,
-			},
-		},
-	)
-	if status != http.StatusOK {
-		t.Fatalf(
-			"expected 200, got %d: %v", status, result,
-		)
-	}
-
-	if result["id"] == nil || result["id"] == "" {
-		t.Fatal("expected message id for valid hashcash")
-	}
-
-	// Verify the message was delivered.
-	msgs, _ := tserver.pollMessages(token, lastID)
-	if !findMessage(msgs, privmsgCmd, "hcaccept_user") {
-		t.Fatalf(
-			"message not received: %v", msgs,
-		)
-	}
-}
-
-func TestChannelHashcashRejectReplayedStamp(t *testing.T) {
-	tserver := newTestServer(t)
-	token := tserver.createSession("hcreplay_user")
-
-	tserver.sendCommand(token, map[string]any{
-		commandKey: joinCmd, toKey: "#hcreplay",
-	})
-
-	// Set hashcash requirement.
-	tserver.sendCommand(token, map[string]any{
-		commandKey: modeCmd,
-		toKey:      "#hcreplay",
-		bodyKey:    []string{"+H", "2"},
-	})
-
-	_, _ = tserver.pollMessages(token, 0)
-
-	// Mint and send once — should succeed.
-	msgBody, marshalErr := json.Marshal(
-		[]string{"unique msg"},
-	)
-	if marshalErr != nil {
-		t.Fatal(marshalErr)
-	}
-
-	stamp := mintTestChannelHashcash(
-		t, 2, "#hcreplay", msgBody,
-	)
-
-	status, _ := tserver.sendCommand(
-		token,
-		map[string]any{
-			commandKey: privmsgCmd,
-			toKey:      "#hcreplay",
-			bodyKey:    []string{"unique msg"},
-			metaKey: map[string]any{
-				hashcashKey: stamp,
-			},
-		},
-	)
-	if status != http.StatusOK {
-		t.Fatalf("expected 200, got %d", status)
-	}
-
-	_, lastID := tserver.pollMessages(token, 0)
-
-	// Replay the same stamp — should fail.
-	status, _ = tserver.sendCommand(
-		token,
-		map[string]any{
-			commandKey: privmsgCmd,
-			toKey:      "#hcreplay",
-			bodyKey:    []string{"unique msg"},
-			metaKey: map[string]any{
-				hashcashKey: stamp,
-			},
-		},
-	)
-	if status != http.StatusOK {
-		t.Fatalf("expected 200, got %d", status)
-	}
-
-	msgs, _ := tserver.pollMessages(token, lastID)
-
-	// Should get ERR_CANNOTSENDTOCHAN (404).
-	if !findNumeric(msgs, "404") {
-		t.Fatalf(
-			"expected replay rejection (404), got %v",
-			msgs,
-		)
-	}
-}
-
-func TestChannelHashcashNoRequirementWorks(t *testing.T) {
-	tserver := newTestServer(t)
-	token := tserver.createSession("hcnone_user")
-
-	tserver.sendCommand(token, map[string]any{
-		commandKey: joinCmd, toKey: "#nohashcash",
-	})
-
-	// No hashcash set — message should work.
-	status, result := tserver.sendCommand(
-		token,
-		map[string]any{
-			commandKey: privmsgCmd,
-			toKey:      "#nohashcash",
-			bodyKey:    []string{"free message"},
-		},
-	)
-	if status != http.StatusOK {
-		t.Fatalf(
-			"expected 200, got %d: %v", status, result,
-		)
-	}
-
-	if result["id"] == nil || result["id"] == "" {
-		t.Fatal("expected message id")
-	}
-}
-
-func TestChannelHashcashInvalidBitsRange(t *testing.T) {
-	tserver := newTestServer(t)
-	token := tserver.createSession("hcbits_user")
-
-	tserver.sendCommand(token, map[string]any{
-		commandKey: joinCmd, toKey: "#hcbits",
-	})
-
-	_, lastID := tserver.pollMessages(token, 0)
-
-	// Try to set bits to 0 — should fail.
-	tserver.sendCommand(token, map[string]any{
-		commandKey: modeCmd,
-		toKey:      "#hcbits",
-		bodyKey:    []string{"+H", "0"},
-	})
-
-	msgs, _ := tserver.pollMessages(token, lastID)
-
-	if !findNumeric(msgs, "472") {
-		t.Fatalf(
-			"expected ERR_UNKNOWNMODE (472), got %v",
-			msgs,
-		)
-	}
-}
-
-func TestChannelHashcashMissingBitsArg(t *testing.T) {
-	tserver := newTestServer(t)
-	token := tserver.createSession("hcnoarg_user")
-
-	tserver.sendCommand(token, map[string]any{
-		commandKey: joinCmd, toKey: "#hcnoarg",
-	})
-
-	_, lastID := tserver.pollMessages(token, 0)
-
-	// Try to set +H without bits argument.
-	tserver.sendCommand(token, map[string]any{
-		commandKey: modeCmd,
-		toKey:      "#hcnoarg",
-		bodyKey:    []string{"+H"},
-	})
-
-	msgs, _ := tserver.pollMessages(token, lastID)
-
-	if !findNumeric(msgs, "461") {
-		t.Fatalf(
-			"expected ERR_NEEDMOREPARAMS (461), got %v",
-			msgs,
-		)
-	}
-}

internal/handlers/auth.go

@@ -5,11 +5,120 @@ import (
 	"net/http"
 	"strings"
 
-	"git.eeqj.de/sneak/neoirc/pkg/irc"
+	"git.eeqj.de/sneak/neoirc/internal/db"
 )
 
 const minPasswordLength = 8
 
+// HandleRegister creates a new user with a password.
+func (hdlr *Handlers) HandleRegister() http.HandlerFunc {
+	return func(
+		writer http.ResponseWriter,
+		request *http.Request,
+	) {
+		request.Body = http.MaxBytesReader(
+			writer, request.Body, hdlr.maxBodySize(),
+		)
+
+		hdlr.handleRegister(writer, request)
+	}
+}
+
+func (hdlr *Handlers) handleRegister(
+	writer http.ResponseWriter,
+	request *http.Request,
+) {
+	type registerRequest struct {
+		Nick     string `json:"nick"`
+		Password string `json:"password"`
+	}
+
+	var payload registerRequest
+
+	err := json.NewDecoder(request.Body).Decode(&payload)
+	if err != nil {
+		hdlr.respondError(
+			writer, request,
+			"invalid request body",
+			http.StatusBadRequest,
+		)
+
+		return
+	}
+
+	payload.Nick = strings.TrimSpace(payload.Nick)
+
+	if !validNickRe.MatchString(payload.Nick) {
+		hdlr.respondError(
+			writer, request,
+			"invalid nick format",
+			http.StatusBadRequest,
+		)
+
+		return
+	}
+
+	if len(payload.Password) < minPasswordLength {
+		hdlr.respondError(
+			writer, request,
+			"password must be at least 8 characters",
+			http.StatusBadRequest,
+		)
+
+		return
+	}
+
+	sessionID, clientID, token, err :=
+		hdlr.params.Database.RegisterUser(
+			request.Context(),
+			payload.Nick,
+			payload.Password,
+		)
+	if err != nil {
+		hdlr.handleRegisterError(
+			writer, request, err,
+		)
+
+		return
+	}
+
+	hdlr.stats.IncrSessions()
+	hdlr.stats.IncrConnections()
+
+	hdlr.deliverMOTD(request, clientID, sessionID, payload.Nick)
+
+	hdlr.respondJSON(writer, request, map[string]any{
+		"id":    sessionID,
+		"nick":  payload.Nick,
+		"token": token,
+	}, http.StatusCreated)
+}
+
+func (hdlr *Handlers) handleRegisterError(
+	writer http.ResponseWriter,
+	request *http.Request,
+	err error,
+) {
+	if db.IsUniqueConstraintError(err) {
+		hdlr.respondError(
+			writer, request,
+			"nick already taken",
+			http.StatusConflict,
+		)
+
+		return
+	}
+
+	hdlr.log.Error(
+		"register user failed", "error", err,
+	)
+	hdlr.respondError(
+		writer, request,
+		"internal error",
+		http.StatusInternalServerError,
+	)
+}
+
 // HandleLogin authenticates a user with nick and password.
 func (hdlr *Handlers) HandleLogin() http.HandlerFunc {
 	return func(
@@ -86,66 +195,9 @@ func (hdlr *Handlers) handleLogin(
 		request, clientID, sessionID, payload.Nick,
 	)
 
-	hdlr.setAuthCookie(writer, request, token)
-
 	hdlr.respondJSON(writer, request, map[string]any{
 		"id":    sessionID,
 		"nick":  payload.Nick,
+		"token": token,
 	}, http.StatusOK)
 }
-
-// handlePass handles the IRC PASS command to set a
-// password on the authenticated session, enabling
-// multi-client login via POST /api/v1/login.
-func (hdlr *Handlers) handlePass(
-	writer http.ResponseWriter,
-	request *http.Request,
-	sessionID, clientID int64,
-	nick string,
-	bodyLines func() []string,
-) {
-	lines := bodyLines()
-	if len(lines) == 0 || lines[0] == "" {
-		hdlr.respondIRCError(
-			writer, request, clientID, sessionID,
-			irc.ErrNeedMoreParams, nick,
-			[]string{irc.CmdPass},
-			"Not enough parameters",
-		)
-
-		return
-	}
-
-	password := lines[0]
-
-	if len(password) < minPasswordLength {
-		hdlr.respondIRCError(
-			writer, request, clientID, sessionID,
-			irc.ErrNeedMoreParams, nick,
-			[]string{irc.CmdPass},
-			"Password must be at least 8 characters",
-		)
-
-		return
-	}
-
-	err := hdlr.params.Database.SetPassword(
-		request.Context(), sessionID, password,
-	)
-	if err != nil {
-		hdlr.log.Error(
-			"set password failed", "error", err,
-		)
-		hdlr.respondError(
-			writer, request,
-			"internal error",
-			http.StatusInternalServerError,
-		)
-
-		return
-	}
-
-	hdlr.respondJSON(writer, request,
-		map[string]string{"status": "ok"},
-		http.StatusOK)
-}

internal/handlers/handlers.go

@@ -36,11 +36,6 @@ type Params struct {
 
 const defaultIdleTimeout = 30 * 24 * time.Hour
 
-// spentHashcashTTL is how long spent hashcash tokens are
-// retained for replay prevention. Per issue requirements,
-// this is 1 year.
-const spentHashcashTTL = 365 * 24 * time.Hour
-
 // Handlers manages HTTP request handling.
 type Handlers struct {
 	params        *Params
@@ -48,7 +43,6 @@ type Handlers struct {
 	hc            *healthcheck.Healthcheck
 	broker        *broker.Broker
 	hashcashVal   *hashcash.Validator
-	channelHashcash *hashcash.ChannelValidator
 	stats         *stats.Tracker
 	cancelCleanup context.CancelFunc
 }
@@ -69,7 +63,6 @@ func New(
 		hc:          params.Healthcheck,
 		broker:      broker.New(),
 		hashcashVal: hashcash.NewValidator(resource),
-		channelHashcash: hashcash.NewChannelValidator(),
 		stats:       params.Stats,
 	}
 
@@ -292,20 +285,4 @@ func (hdlr *Handlers) pruneQueuesAndMessages(
 			)
 		}
 	}
-
-	// Prune spent hashcash tokens older than 1 year.
-	hashcashCutoff := time.Now().Add(-spentHashcashTTL)
-
-	pruned, err := hdlr.params.Database.
-		PruneSpentHashcash(ctx, hashcashCutoff)
-	if err != nil {
-		hdlr.log.Error(
-			"spent hashcash pruning failed", "error", err,
-		)
-	} else if pruned > 0 {
-		hdlr.log.Info(
-			"pruned spent hashcash tokens",
-			"deleted", pruned,
-		)
-	}
 }

internal/hashcash/channel.go

@@ -1,186 +0,0 @@
-package hashcash
-
-import (
-	"crypto/sha256"
-	"encoding/hex"
-	"errors"
-	"fmt"
-	"strconv"
-	"strings"
-	"time"
-)
-
-var (
-	errBodyHashMismatch = errors.New(
-		"body hash mismatch",
-	)
-	errBodyHashMissing = errors.New(
-		"body hash missing",
-	)
-)
-
-// ChannelValidator checks hashcash stamps for
-// per-channel PRIVMSG validation. It verifies that
-// stamps are bound to a specific channel and message
-// body. Replay prevention is handled externally via
-// the database spent_hashcash table for persistence
-// across server restarts (1-year TTL).
-type ChannelValidator struct{}
-
-// NewChannelValidator creates a ChannelValidator.
-func NewChannelValidator() *ChannelValidator {
-	return &ChannelValidator{}
-}
-
-// BodyHash computes the hex-encoded SHA-256 hash of a
-// message body for use in hashcash stamp validation.
-func BodyHash(body []byte) string {
-	hash := sha256.Sum256(body)
-
-	return hex.EncodeToString(hash[:])
-}
-
-// ValidateStamp checks a channel hashcash stamp. It
-// verifies the stamp format, difficulty, date, channel
-// binding, body hash binding, and proof-of-work. Replay
-// detection is NOT performed here — callers must check
-// the spent_hashcash table separately.
-//
-// Stamp format: 1:bits:YYMMDD:channel:bodyhash:counter.
-func (cv *ChannelValidator) ValidateStamp(
-	stamp string,
-	requiredBits int,
-	channel string,
-	bodyHash string,
-) error {
-	if requiredBits <= 0 {
-		return nil
-	}
-
-	parts := strings.Split(stamp, ":")
-	if len(parts) != stampFields {
-		return fmt.Errorf(
-			"%w: expected %d, got %d",
-			errInvalidFields, stampFields, len(parts),
-		)
-	}
-
-	version := parts[0]
-	bitsStr := parts[1]
-	dateStr := parts[2]
-	resource := parts[3]
-	stampBodyHash := parts[4]
-
-	headerErr := validateChannelHeader(
-		version, bitsStr, resource,
-		requiredBits, channel,
-	)
-	if headerErr != nil {
-		return headerErr
-	}
-
-	stampTime, parseErr := parseStampDate(dateStr)
-	if parseErr != nil {
-		return parseErr
-	}
-
-	timeErr := validateTime(stampTime)
-	if timeErr != nil {
-		return timeErr
-	}
-
-	bodyErr := validateBodyHash(
-		stampBodyHash, bodyHash,
-	)
-	if bodyErr != nil {
-		return bodyErr
-	}
-
-	return validateProof(stamp, requiredBits)
-}
-
-// StampHash returns a deterministic hash of a stamp
-// string for use as a spent-token key.
-func StampHash(stamp string) string {
-	hash := sha256.Sum256([]byte(stamp))
-
-	return hex.EncodeToString(hash[:])
-}
-
-func validateChannelHeader(
-	version, bitsStr, resource string,
-	requiredBits int,
-	channel string,
-) error {
-	if version != stampVersion {
-		return fmt.Errorf(
-			"%w: %s", errBadVersion, version,
-		)
-	}
-
-	claimedBits, err := strconv.Atoi(bitsStr)
-	if err != nil || claimedBits < requiredBits {
-		return fmt.Errorf(
-			"%w: need %d bits",
-			errInsufficientBits, requiredBits,
-		)
-	}
-
-	if resource != channel {
-		return fmt.Errorf(
-			"%w: got %q, want %q",
-			errWrongResource, resource, channel,
-		)
-	}
-
-	return nil
-}
-
-func validateBodyHash(
-	stampBodyHash, expectedBodyHash string,
-) error {
-	if stampBodyHash == "" {
-		return errBodyHashMissing
-	}
-
-	if stampBodyHash != expectedBodyHash {
-		return fmt.Errorf(
-			"%w: got %q, want %q",
-			errBodyHashMismatch,
-			stampBodyHash, expectedBodyHash,
-		)
-	}
-
-	return nil
-}
-
-// MintChannelStamp computes a channel hashcash stamp
-// with the given difficulty, channel name, and body hash.
-// This is intended for clients to generate stamps before
-// sending PRIVMSG to hashcash-protected channels.
-//
-// Stamp format: 1:bits:YYMMDD:channel:bodyhash:counter.
-func MintChannelStamp(
-	bits int,
-	channel string,
-	bodyHash string,
-) string {
-	date := time.Now().UTC().Format(dateFormatShort)
-	prefix := fmt.Sprintf(
-		"1:%d:%s:%s:%s:",
-		bits, date, channel, bodyHash,
-	)
-
-	counter := uint64(0)
-
-	for {
-		stamp := prefix + strconv.FormatUint(counter, 16)
-		hash := sha256.Sum256([]byte(stamp))
-
-		if hasLeadingZeroBits(hash[:], bits) {
-			return stamp
-		}
-
-		counter++
-	}
-}

internal/hashcash/channel_test.go

@@ -1,244 +0,0 @@
-package hashcash_test
-
-import (
-	"crypto/sha256"
-	"encoding/hex"
-	"testing"
-
-	"git.eeqj.de/sneak/neoirc/internal/hashcash"
-)
-
-const (
-	testChannel  = "#general"
-	testBodyText = `["hello world"]`
-)
-
-func testBodyHash() string {
-	hash := sha256.Sum256([]byte(testBodyText))
-
-	return hex.EncodeToString(hash[:])
-}
-
-func TestChannelValidateHappyPath(t *testing.T) {
-	t.Parallel()
-
-	validator := hashcash.NewChannelValidator()
-	bodyHash := testBodyHash()
-
-	stamp := hashcash.MintChannelStamp(
-		testBits, testChannel, bodyHash,
-	)
-
-	err := validator.ValidateStamp(
-		stamp, testBits, testChannel, bodyHash,
-	)
-	if err != nil {
-		t.Fatalf("valid channel stamp rejected: %v", err)
-	}
-}
-
-func TestChannelValidateWrongChannel(t *testing.T) {
-	t.Parallel()
-
-	validator := hashcash.NewChannelValidator()
-	bodyHash := testBodyHash()
-
-	stamp := hashcash.MintChannelStamp(
-		testBits, testChannel, bodyHash,
-	)
-
-	err := validator.ValidateStamp(
-		stamp, testBits, "#other", bodyHash,
-	)
-	if err == nil {
-		t.Fatal("expected channel mismatch error")
-	}
-}
-
-func TestChannelValidateWrongBodyHash(t *testing.T) {
-	t.Parallel()
-
-	validator := hashcash.NewChannelValidator()
-	bodyHash := testBodyHash()
-
-	stamp := hashcash.MintChannelStamp(
-		testBits, testChannel, bodyHash,
-	)
-
-	wrongHash := sha256.Sum256([]byte("different body"))
-	wrongBodyHash := hex.EncodeToString(wrongHash[:])
-
-	err := validator.ValidateStamp(
-		stamp, testBits, testChannel, wrongBodyHash,
-	)
-	if err == nil {
-		t.Fatal("expected body hash mismatch error")
-	}
-}
-
-func TestChannelValidateInsufficientBits(t *testing.T) {
-	t.Parallel()
-
-	validator := hashcash.NewChannelValidator()
-	bodyHash := testBodyHash()
-
-	// Mint with 2 bits but require 4.
-	stamp := hashcash.MintChannelStamp(
-		testBits, testChannel, bodyHash,
-	)
-
-	err := validator.ValidateStamp(
-		stamp, 4, testChannel, bodyHash,
-	)
-	if err == nil {
-		t.Fatal("expected insufficient bits error")
-	}
-}
-
-func TestChannelValidateZeroBitsSkips(t *testing.T) {
-	t.Parallel()
-
-	validator := hashcash.NewChannelValidator()
-
-	err := validator.ValidateStamp(
-		"garbage", 0, "#ch", "abc",
-	)
-	if err != nil {
-		t.Fatalf("zero bits should skip: %v", err)
-	}
-}
-
-func TestChannelValidateBadFormat(t *testing.T) {
-	t.Parallel()
-
-	validator := hashcash.NewChannelValidator()
-
-	err := validator.ValidateStamp(
-		"not:valid", testBits, testChannel, "abc",
-	)
-	if err == nil {
-		t.Fatal("expected bad format error")
-	}
-}
-
-func TestChannelValidateBadVersion(t *testing.T) {
-	t.Parallel()
-
-	validator := hashcash.NewChannelValidator()
-	bodyHash := testBodyHash()
-
-	stamp := "2:2:260317:#general:" + bodyHash + ":counter"
-
-	err := validator.ValidateStamp(
-		stamp, testBits, testChannel, bodyHash,
-	)
-	if err == nil {
-		t.Fatal("expected bad version error")
-	}
-}
-
-func TestChannelValidateExpiredStamp(t *testing.T) {
-	t.Parallel()
-
-	validator := hashcash.NewChannelValidator()
-	bodyHash := testBodyHash()
-
-	// Mint with a very old date by manually constructing.
-	stamp := mintStampWithDate(
-		t, testBits, testChannel, "200101",
-	)
-
-	err := validator.ValidateStamp(
-		stamp, testBits, testChannel, bodyHash,
-	)
-	if err == nil {
-		t.Fatal("expected expired stamp error")
-	}
-}
-
-func TestChannelValidateMissingBodyHash(t *testing.T) {
-	t.Parallel()
-
-	validator := hashcash.NewChannelValidator()
-	bodyHash := testBodyHash()
-
-	// Construct a stamp with empty body hash field.
-	stamp := mintStampWithDate(
-		t, testBits, testChannel, todayDate(),
-	)
-
-	// This uses the session-style stamp which has empty
-	// ext field — body hash is missing.
-	err := validator.ValidateStamp(
-		stamp, testBits, testChannel, bodyHash,
-	)
-	if err == nil {
-		t.Fatal("expected missing body hash error")
-	}
-}
-
-func TestBodyHash(t *testing.T) {
-	t.Parallel()
-
-	body := []byte(`["hello world"]`)
-	bodyHash := hashcash.BodyHash(body)
-
-	if len(bodyHash) != 64 {
-		t.Fatalf(
-			"expected 64-char hex hash, got %d",
-			len(bodyHash),
-		)
-	}
-
-	// Same input should produce same hash.
-	bodyHash2 := hashcash.BodyHash(body)
-	if bodyHash != bodyHash2 {
-		t.Fatal("body hash not deterministic")
-	}
-
-	// Different input should produce different hash.
-	bodyHash3 := hashcash.BodyHash([]byte("different"))
-	if bodyHash == bodyHash3 {
-		t.Fatal("different inputs produced same hash")
-	}
-}
-
-func TestStampHash(t *testing.T) {
-	t.Parallel()
-
-	hash1 := hashcash.StampHash("stamp1")
-	hash2 := hashcash.StampHash("stamp2")
-
-	if hash1 == hash2 {
-		t.Fatal("different stamps produced same hash")
-	}
-
-	// Same input should be deterministic.
-	hash1b := hashcash.StampHash("stamp1")
-	if hash1 != hash1b {
-		t.Fatal("stamp hash not deterministic")
-	}
-}
-
-func TestMintChannelStamp(t *testing.T) {
-	t.Parallel()
-
-	bodyHash := testBodyHash()
-	stamp := hashcash.MintChannelStamp(
-		testBits, testChannel, bodyHash,
-	)
-
-	if stamp == "" {
-		t.Fatal("expected non-empty stamp")
-	}
-
-	// Validate the minted stamp.
-	validator := hashcash.NewChannelValidator()
-
-	err := validator.ValidateStamp(
-		stamp, testBits, testChannel, bodyHash,
-	)
-	if err != nil {
-		t.Fatalf("minted stamp failed validation: %v", err)
-	}
-}

internal/middleware/middleware.go

@@ -126,23 +126,18 @@ func (mware *Middleware) Logging() func(http.Handler) http.Handler {
 }
 
 // CORS returns middleware that handles Cross-Origin Resource Sharing.
-// AllowCredentials is true so browsers include cookies in
-// cross-origin API requests.
 func (mware *Middleware) CORS() func(http.Handler) http.Handler {
 	return cors.Handler(cors.Options{ //nolint:exhaustruct // optional fields
-		AllowOriginFunc: func(
-			_ *http.Request, _ string,
-		) bool {
-			return true
-		},
+		AllowedOrigins: []string{"*"},
 		AllowedMethods: []string{
 			"GET", "POST", "PUT", "DELETE", "OPTIONS",
 		},
 		AllowedHeaders: []string{
-			"Accept", "Content-Type", "X-CSRF-Token",
+			"Accept", "Authorization",
+			"Content-Type", "X-CSRF-Token",
 		},
 		ExposedHeaders:   []string{"Link"},
-		AllowCredentials: true,
+		AllowCredentials: false,
 		MaxAge:           corsMaxAge,
 	})
 }

internal/server/routes.go

@@ -75,6 +75,10 @@ func (srv *Server) setupAPIv1(router chi.Router) {
 		"/session",
 		srv.handlers.HandleCreateSession(),
 	)
+	router.Post(
+		"/register",
+		srv.handlers.HandleRegister(),
+	)
 	router.Post(
 		"/login",
 		srv.handlers.HandleLogin(),

pkg/irc/commands.go

@@ -11,7 +11,6 @@ const (
 	CmdNames   = "NAMES"
 	CmdNick    = "NICK"
 	CmdNotice  = "NOTICE"
-	CmdPass    = "PASS"
 	CmdPart    = "PART"
 	CmdPing    = "PING"
 	CmdPong    = "PONG"