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Author SHA1 Message Date
clawbotandsneak 61f42e6602 feat: validate configuration on startup, fail fast on bad config (closes #52) (#53)
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closes #52

Implements startup configuration validation per the plan on #52. Two commits, TDD: the first commit adds the enforcement tests (red — six test functions fail against the lenient behavior) plus a mechanical extraction of `newFromSmartConfig` from `config.New` so construction is testable without fx; the second commit makes them green and carries the `TODO.md` bookkeeping.

## Behavior

- **No silent fallbacks**: a config value that is SET but unparseable or invalid aborts startup with an error naming the key and value. Defaults apply only to OMITTED keys. The old `getString`/`getInt`/`getBool` helpers swallowed every conversion error and returned the default; they are now strict. Fractional ports are rejected, not truncated (smartconfig's `GetInt` would have turned `8080.5` into `8080`).
- **Unknown keys abort**: unknown top-level keys and unknown `metrics` subkeys are fatal, each named in the error (`unknown config keys: whitelist_hosts`). The `env` section stays permitted because smartconfig consumes it for environment injection.
- **Malformed config file aborts**: a config file that exists at a standard location but fails to parse was previously logged as a warning and skipped (the server would start on defaults); it is now fatal.
- **Range/sanity checks**: `port` in 1-65535; `upstream_connections_per_host` at least 1; `signing_key` required, at least 32 characters (keyless mode was never implemented; the stale "leave empty" comment in `config.example.yml` is corrected); `allowlist_hosts` entries must be bare hostnames (leading-dot suffix patterns still allowed; schemes, paths, whitespace, non-string and empty entries rejected); `state_dir` non-empty and verified creatable+writable with a probe file before the listener binds; `sentry_dsn` must be a URL with scheme and host when set; `metrics.username`/`metrics.password` must be set together.

## Verification

- `make check` green on the branch head (all tests, golangci-lint 0 issues, fmt-check clean).
- End-to-end: `./bin/pixad` with `port: banana` exits 1 printing `config key "port": value "banana" is not an integer`; with `whitelist_hosts:` it exits 1 printing `unknown config keys: whitelist_hosts`.

## Notes for review

- `getStringSlice` keeps its lenient signature because the existing tests in `config_test.go` exercise it and modifying existing tests requires explicit approval. Strictness for `allowlist_hosts` is instead enforced up front on the raw value by `validateAllowlistHostsValue`, so nothing is silently skipped; extraction then reuses the existing parser. If you prefer the helper folded into a single strict function, that requires retargeting those three tests — happy to do that as a follow-up with approval.
- `TODO.md` here is edited against current `main`; PR #50 (merge-ready) edits adjacent lines, so whichever merges second will need a trivial rebase of `TODO.md` only.
- The README Configuration section lists keys that have never existed in the code (`access_control_allow_origin`, `upstream_fetch_timeout`, `upstream_max_response_size`, `downstream_timeout`). Under this change a config using them now fails fast instead of silently doing nothing — that is the intended behavior. Implementing them is already tracked as the P2 "add all configuration options from README" item in `TODO.md`.

Co-authored-by: sneak <sneak@sneak.berlin>
Reviewed-on: #53
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2026-08-07 22:39:40 +02:00
clawbotandsneak 5d0b5f864e docs: record manual test pass of auth and encrypted URL flows (closes #49) (#50)
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closes #49

Records the P0 manual test pass in `TODO.md` per its Workflow section
(checked-off results into Completed Steps; cache size management and
eviction promoted to Next Step). `TODO.md` is the only changed file —
no production code changes, as the issue requires.

## Test setup

`pixad` built from `main` at `6573b9d` via `make build`, run on port
18099 with a throwaway local config (temp state dir, known
`signing_key`, `allowlist_hosts` including `s3.sneak.cloud`), driven
with curl using explicit cookie replay (session cookies are
`Secure`/`HttpOnly`/`SameSite=Strict`).

## Results — all six checks PASS

1. **Login form**: GET `/` → HTTP 200, `Pixa - Login` page with
   `name="key"` password form.
2. **Wrong key error**: POST `/` with `key=wrong-key` → HTTP 200 login
   page containing "Invalid signing key".
3. **Generator form**: POST `/` with the correct signing key → HTTP 303
   to `/` with `Set-Cookie: pixa_session=...; HttpOnly; Secure;
   SameSite=Strict`; GET `/` with that cookie → `Pixa - URL Generator`
   with the `/generate` form and logout link.
4. **Encrypted URL serves image**: POST `/generate` (ttl=3600) produced
   a `/v1/e/<token>/img.jpeg` URL → HTTP 200, `Content-Type:
   image/jpeg`, 800x600 baseline JPEG, 61706 bytes.
5. **Expired URL → 410**: a ttl=1 URL fetched after 3 s → HTTP 410 Gone
   with `{"error":"URL has expired","status":410,...}`.
6. **Logout**: GET `/logout` → HTTP 303 to `/` with `Set-Cookie:
   pixa_session=; Max-Age=0`; subsequent GET `/` → login form again.

Additionally, all nine checks in `scripts/manual-test.sh` passed
against the same server instance.

## Verification

`make check` green on the branch head (all tests, golangci-lint 0
issues, fmt-check clean) — the first fully green `make check` on a
`main`-derived branch under the current linter, confirming the #47/#48
fix on merged `main`.

Note for review: the test execution was performed this session; the
adversarial re-review (independently re-running the six flows) is still
pending and should happen before merge.

Co-authored-by: sneak <sneak@sneak.berlin>
Reviewed-on: #50
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2026-08-07 18:44:01 +02:00
clawbotandsneak 6573b9d1ef refactor: extract signature package from imgcache (#46)
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Extracts HMAC-SHA256 request signing out of `internal/imgcache/` into its own `internal/signature/` package, per the plan in [issue #39](#39).

This is one of the remaining "easily separable" extractions (`imageprocessor`, `allowlist`, `magic`, and `httpfetcher` already landed). Only the signer is moved here so the diff stays reviewable.

## What moved

From `internal/imgcache/signature.go` and its tests into `internal/signature/`:

- `Signer` type, its `New` constructor, `Sign`, `Verify`, `GenerateSignedURL`
- `ParseParams` (query-string signature/expiration parsing)
- Signature error sentinels

## One-way import edge

To keep the import edge one-way (`imgcache` depends on `signature`, never the reverse), the package defines a standalone `Request` type carrying just the fields the signature covers, instead of importing `imgcache.ImageRequest`. `imgcache` projects its `ImageRequest` onto `signature.Request` via a small unexported `signatureRequest` helper. This mirrors how the `magic` extraction defined its own `ImageFormat` type.

## Renames (no stuttering)

- `NewSigner` -> `signature.New`
- `ParseSignatureParams` -> `signature.ParseParams`
- `ErrSignatureRequired`/`Invalid`/`Expired` -> `signature.ErrRequired`/`Invalid`/`Expired`

The `ErrRequired` message is updated from "non-whitelisted host" to "non-allowlisted host" for inclusive terminology, consistent with the `allowlist` rename.

## Rework (post-review)

Three commits added after review feedback:

- `d69019b` — golden known-answer test pinning the exact HMAC signatures and signed URL paths for three fixed vectors (resized, resized+query, orig size), cross-validated against an independent HMAC implementation. Any change to the signed byte format now fails loudly.
- `43b9f1c` — whitelist→allowlist rename completed across `internal/imgcache` and `internal/handlers` (`ServiceConfig.Allowlist`, `Allowlist` interface, `IsAllowlisted`, test helpers and test names).
- `3dc1999` — one-pass config surface rename, no back-compat alias: YAML key `whitelist_hosts` → `allowlist_hosts`, `Config.WhitelistHosts` → `Config.AllowlistHosts`, `config.example.yml`, `scripts/manual-test.sh`, and `README.md` (which also documented a nonexistent `source_host_whitelist` key — now fixed to the real one).

## Behavior

Pure refactor apart from the config key rename above. The bytes fed to the HMAC are unchanged (`host:path:query:width:height:format:expiration`), so previously issued signatures remain valid — now enforced by the golden test. All existing tests move with the package. `script/cibuild` passes at head `3dc1999` (fmt-check, lint, test, build).

refs #39

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Co-authored-by: Jeffrey Paul <sneak@noreply.example.org>
Reviewed-on: #46
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2026-08-07 17:44:00 +02:00
clawbotandsneak 275e145a6d fix: set Secure/HttpOnly/SameSite on session cookies (closes #47) (#48)
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closes #47

Fixes the two remaining `gosec` findings on `main`, both `G124`
(http.Cookie missing or has insecure `Secure`, `HttpOnly`, or
`SameSite` attribute):

- `internal/session/session.go:84` (`CreateSession`, the login
  set-cookie path)
- `internal/session/session.go:128` (`ClearSession`, the logout
  delete-cookie path)

## What changed

- Both cookie-writing paths now unconditionally set `Secure: true`,
  `HttpOnly: true`, and `SameSite: http.SameSiteStrictMode`.
- The `secure` field (previously wired to `!config.Debug`) and the
  `sameSite` field are removed from `session.Manager`, and the dead
  secure-toggle parameter is removed from `session.NewManager`, which
  now takes only the signing key (reviewer-directed; the mechanical
  call-shape updates in `session_test.go` leave every assertion
  untouched).
- TDD per repo rules: the first commit adds
  `TestSessionCookieAttributesAlwaysSecure` (failing), asserting that
  every cookie emitted by the session manager carries `HttpOnly`,
  `Secure`, and `SameSite` of Lax or stricter, for both write paths.
  The second commit makes it pass.
- `TODO.md` updated per its Workflow section (Next Step completed,
  next Future Step promoted, stale "10 open findings" Status text
  corrected).

## Attribute choices and reasoning

- `Secure: true` always: the `G124` analyzer only accepts a constant
  `true` store, and there is no legitimate configuration in which the
  authentication cookie should be sent over plaintext HTTP. The old
  behavior disabled `Secure` whenever `debug` was on. Local development
  over `http://localhost` keeps working: browsers treat `localhost` as
  a trustworthy origin and accept `Secure` cookies there. Any
  plain-HTTP flow on a non-localhost host will no longer keep a
  session, which is the point of the fix.
- `SameSite: Strict` (unchanged from current production behavior, and
  stricter than the Lax minimum): the login form is a same-origin POST
  to `/` followed by a same-site redirect, so `Strict` breaks nothing.
- `HttpOnly: true` (unchanged).

## Verification

`make check` (tests, golangci-lint, fmt-check) is fully green on the
branch head `cb9e14e`: all tests pass and the linter reports 0 issues,
independently confirmed by the reviewer in a fresh worktree. Commit
history: `ca15f52` (failing test) → `02ca16a` (fix + TODO.md, closes
#47) → `cb9e14e` (drop the dead `NewManager` parameter).

Co-authored-by: sneak <sneak@sneak.berlin>
Reviewed-on: #48
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2026-08-07 17:41:03 +02:00
b6e9ac2a93 refactor: extract httpfetcher package from imgcache (#43)
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Extracts the HTTP fetcher concern out of `internal/imgcache/` into its own `internal/httpfetcher/` package, per the plan in [issue #39](#39).

This is one of four planned extractions; only the fetcher is moved here so the diff stays reviewable. The remaining three (signature, magic, urlparser) will land in separate PRs.

## What moved

From `internal/imgcache/fetcher.go` and `internal/imgcache/mock_fetcher.go` into `internal/httpfetcher/`:

- `HTTPFetcher` type, its `New` constructor, and `Config` (formerly `FetcherConfig`) with `DefaultConfig`
- SSRF-safe dialer, `validateURL`, `isPrivateIP`, `isLocalhost`, `extractHost`
- Per-host connection semaphore (rate limiting) and `limitedReader`
- Content-type validation (`isAllowedContentType`, `detectContentTypeFromPath`)
- All related error values (`ErrSSRFBlocked`, `ErrUpstreamError`, `ErrUpstreamTimeout`, `ErrPayloadTooLarge`, `ErrDisallowedContentType`)
- All related constants (`DefaultFetchTimeout`, `DefaultMaxPayloadBytes`, `DefaultMaxConnectionsPerHost`, etc.)
- The `Fetcher` interface and `FetchResult` type (moved here to keep the import edge one-way: `imgcache` depends on `httpfetcher`, never the reverse)
- `MockFetcher` test helper

## Renames (no stuttering)

- `NewHTTPFetcher` → `httpfetcher.New`
- `FetcherConfig` → `httpfetcher.Config`
- `DefaultFetcherConfig` → `httpfetcher.DefaultConfig`
- `NewMockFetcher` → `httpfetcher.NewMock`

The `ServiceConfig.FetcherConfig` field name is retained — it describes what kind of config the field holds (not a stutter).

## Behavior

Pure refactor. No behavior changes. All existing tests pass; unit tests for the new package are included.

`docker build .` passes (fmt-check, lint, test, build).

refs #39

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2026-07-25 12:26:18 +02:00
clawbotanduser 6b4a1d7607 refactor: extract magic byte detection into internal/magic package (#42)
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## Summary

Extract magic byte detection and MIME type handling from `internal/imgcache/` into a new focused `internal/magic/` package.

Part of [issue #39](#39)

## Changes

### New package: `internal/magic/`

Moved the following from `internal/imgcache/magic.go`:
- `MIMEType` type and constants (`MIMETypeJPEG`, `MIMETypePNG`, etc.)
- `DetectFormat()` — detects image format from magic bytes
- `ValidateMagicBytes()` — validates content matches declared MIME type
- `PeekAndValidate()` — reads minimum bytes, validates, returns combined reader
- `IsSupportedMIMEType()` — checks if a MIME type is supported
- `MIMEToImageFormat()` — converts MIME type to ImageFormat
- `ImageFormatToMIME()` — converts ImageFormat to MIME string
- All error sentinels (`ErrUnknownFormat`, `ErrMagicByteMismatch`, `ErrNotEnoughData`)
- All helper functions (`detectSVG`, `skipBOM`, `normalizeMIMEType`)

The magic package defines its own `ImageFormat` type and constants to avoid circular imports (`imgcache` → `magic` for validation; `magic` cannot import `imgcache`).

### Updated imports
- `internal/imgcache/service.go`: uses `magic.ValidateMagicBytes()`
- `internal/imgcache/service_test.go`: uses `magic.DetectFormat()` and `magic.MIMEToImageFormat()`

### Naming
- Clean package-qualified names: `magic.DetectFormat()`, `magic.ValidateMagicBytes()`, etc.
- No stuttering names

### Tests
- Full test suite moved to `internal/magic/magic_test.go` (all 15 test functions preserved)
- All existing tests pass unchanged
- `docker build .` passes (includes `make check`: fmt, lint, tests)

Co-authored-by: user <user@Mac.lan guest wan>
Reviewed-on: #42
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2026-04-07 00:41:48 +02:00
e34743f070 refactor: extract whitelist package from internal/imgcache (#41)
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Extract `HostWhitelist`, `NewHostWhitelist`, `IsWhitelisted`, `IsEmpty`, and `Count` from `internal/imgcache/` into the new `internal/whitelist/` package.

The whitelist package is completely self-contained, depending only on `net/url` and `strings` from the standard library. No circular imports introduced.

**Changes:**
- Moved `whitelist.go` → `internal/whitelist/whitelist.go` (added package comment)
- Moved `whitelist_test.go` → `internal/whitelist/whitelist_test.go` (adapted to external test style)
- Updated `internal/imgcache/service.go` to import from `sneak.berlin/go/pixa/internal/whitelist`

`docker build .` passes (lint, tests, build).

Part of [issue #39](#39)

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Reviewed-on: #41
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2026-03-25 20:44:56 +01:00
7010d55d72 Move schema_migrations table creation into 000.sql (#36)
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## Summary

Moves the `schema_migrations` table definition from inline Go code into `internal/database/schema/000.sql`, so the migration tracking table schema lives alongside all other schema files.

closes #29

## Changes

### New file: `internal/database/schema/000.sql`
- Contains the `CREATE TABLE IF NOT EXISTS schema_migrations` DDL
- This is applied as a bootstrap step before the normal migration loop

### Refactored: `internal/database/database.go`
- Removed the inline `CREATE TABLE IF NOT EXISTS schema_migrations` SQL from both `runMigrations` and `ApplyMigrations`
- Added `bootstrapMigrationsTable()` which:
  - Checks `sqlite_master` to see if the table already exists
  - If missing: reads and executes `000.sql` to create it, then records version `000`
  - If present (backwards compat with existing DBs created by old inline code): back-fills version `000` so the normal loop skips the bootstrap file
- Deduplicated: both `Database.runMigrations()` and the exported `ApplyMigrations()` now delegate to a single `applyMigrations()` helper
- Added `logInfo`/`logDebug` helpers to handle the optional logger (nil when called from `ApplyMigrations` in tests)

### New file: `internal/database/database_test.go`
- `TestApplyMigrations_CreatesSchemaAndTables` — verifies all migrations apply and all expected tables exist
- `TestApplyMigrations_Idempotent` — verifies running migrations twice produces no errors or duplicates
- `TestBootstrapMigrationsTable_FreshDatabase` — verifies bootstrap creates the table and records version 000
- `TestBootstrapMigrationsTable_ExistingTableBackwardsCompat` — verifies existing DBs (from old inline-SQL code) get version 000 back-filled without data loss

## Conflict note

[PR #33](#33) (for [issue #28](#28)) is also modifying migration code. This PR is based on current `main` and the conflict will be resolved at merge time.

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2026-03-25 02:20:52 +01:00
clawbotanduser a50364bfca Enforce and document exact-match-only for signature verification (#40)
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Closes #27

Signatures are per-URL only — this PR adds explicit tests and documentation enforcing that HMAC-SHA256 signatures verify against exact URLs only. No suffix matching, wildcard matching, or partial matching is supported.

## What this does NOT touch

**The host whitelist code (`whitelist.go`) is not modified.** This PR is exclusively about signature verification, per sneak's instructions on [issue #27](#27), [PR #32](#32), and [PR #35](#35).

## Changes

### `internal/imgcache/signature.go`
- Added documentation comments on `Verify()` and `buildSignatureData()` explicitly specifying that signatures are exact-match only — no suffix, wildcard, or partial matching

### `internal/imgcache/signature_test.go`
- **`TestSigner_Verify_ExactMatchOnly`**: 14 tamper cases verifying that modifying any signed component (host, path, query, dimensions, format) causes verification to fail. Host-specific cases include:
  - Parent domain (`example.com`) does not match subdomain signature (`cdn.example.com`)
  - Sibling subdomain (`images.example.com`) does not match
  - Deeper subdomain (`images.cdn.example.com`) does not match
  - Evil suffix domain (`cdn.example.com.evil.com`) does not match
  - Prefixed host (`evilcdn.example.com`) does not match
- **`TestSigner_Sign_ExactHostInData`**: Verifies that suffix-related hosts (`cdn.example.com`, `example.com`, `images.example.com`, etc.) all produce distinct signatures

### `internal/imgcache/service_test.go`
- **`TestService_ValidateRequest_SignatureExactHostMatch`**: Integration test through `ValidateRequest` verifying that a valid signature for `cdn.example.com` is rejected when presented with a different host (parent domain, sibling subdomain, deeper subdomain, evil suffix, prefixed host)

### `README.md`
- Updated Signature Specification section to explicitly document exact-match-only semantics

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Reviewed-on: #40
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2026-03-20 23:56:45 +01:00
e85b5ff033 Consolidate appname to internal/globals as a constant (#34)
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Closes [issue #30](#30).

The appname `"pixad"` was redundantly defined in both `cmd/pixad/main.go` (as a package-level var) and `internal/globals/globals.go` (as a package-level var that got copied from main). Since the appname is always `"pixad"` and is not actually set via ldflags (only `Version` is), this PR:

- Defines `appname` once as an unexported constant in `internal/globals/globals.go`
- Removes the `Appname` var from `cmd/pixad/main.go`
- Removes the `globals.Appname = Appname` assignment from `main.run()`
- Keeps `Version` flow unchanged (still set via ldflags in main, passed to globals)

The `Globals.Appname` struct field remains available to all consumers — they just get it from the constant now instead of a package var that was always `"pixad"`.

All existing tests pass, `docker build .` succeeds.

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Reviewed-on: #34
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2026-03-20 07:04:54 +01:00
55a609dd77 Bound imageprocessor.Process input read to prevent unbounded memory use (#37)
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closes #31

## Problem

`ImageProcessor.Process` used `io.ReadAll(input)` without any size limit, allowing arbitrarily large inputs to exhaust all available memory. This is a DoS vector — even though the upstream fetcher has a `MaxResponseSize` limit (50 MiB), the processor interface accepts any `io.Reader` and should defend itself independently.

Additionally, the service layer's `processFromSourceOrFetch` read cached source content with `io.ReadAll` without a bound, so an unexpectedly large cached file could also cause unbounded memory consumption.

## Changes

### Processor (`processor.go`)
- Added `maxInputBytes` field to `ImageProcessor` (configurable, defaults to 50 MiB via `DefaultMaxInputBytes`)
- `NewImageProcessor` now accepts a `maxInputBytes` parameter (0 or negative uses the default)
- `Process` now wraps the input reader with `io.LimitReader` and rejects inputs exceeding the limit with `ErrInputDataTooLarge`
- Added `DefaultMaxInputBytes` and `ErrInputDataTooLarge` exported constants/errors

### Service (`service.go`)
- `NewService` now wires the fetcher's `MaxResponseSize` through to the processor
- Extracted `loadCachedSource` helper method to flatten nesting in `processFromSourceOrFetch`
- Cached source reads are now bounded by `maxResponseSize` — oversized cached files are discarded and re-fetched

### Tests (`processor_test.go`)
- `TestImageProcessor_RejectsOversizedInputData` — verifies that inputs exceeding `maxInputBytes` are rejected with `ErrInputDataTooLarge`
- `TestImageProcessor_AcceptsInputWithinLimit` — verifies that inputs within the limit are processed normally
- `TestImageProcessor_DefaultMaxInputBytes` — verifies that 0 and negative values use the default
- All existing tests updated to use `NewImageProcessor(0)` (default limit)

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Reviewed-on: #37
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2026-03-20 07:01:15 +01:00
clawbotanduser 9c29cb57df feat: parse version prefix from migration filenames (#33)
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Closes #28

Migration filenames now follow the pattern `<version>_<description>.sql` (e.g. `001_initial_schema.sql`). The version stored in `schema_migrations` is the numeric prefix only, not the full filename stem.

## Changes

- **`ParseMigrationVersion()`** — new exported function that extracts the numeric prefix from migration filenames. Validates that the prefix is purely numeric and rejects malformed filenames (empty prefix, non-numeric characters, leading underscore).
- **Renamed `001.sql` → `001_initial_schema.sql`** — migration files can now have descriptive names while the tracked version remains `001`. This is safe pre-1.0.0 (no installed base).
- **Deduplicated migration logic** — `runMigrations()` and `ApplyMigrations()` now share a single `applyMigrations()` implementation, plus extracted `collectMigrations()` and `ensureMigrationsTable()` helpers.
- **Unit tests** — `TestParseMigrationVersion` covers valid patterns (version-only, with description, multi-digit, multiple underscores) and error cases (empty, leading underscore, non-numeric, mixed alphanumeric). `TestApplyMigrations` and `TestApplyMigrationsIdempotent` verify end-to-end migration application against an in-memory SQLite database.

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2026-03-18 03:18:38 +01:00
clawbotanduser 2e934c8894 fix: QA audit fixes for 1.0/MVP readiness (#25)
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closes #24

## QA Audit Fixes

This PR addresses issues found during the 1.0/MVP QA audit.

### Changes

1. **TODO.md: Mark AVIF encoding as done** — AVIF encoding is fully implemented via govips in `processor.go` but was still listed as a TODO item.

2. **scripts/manual-test.sh: Fix form field names** — The manual test script was using wrong field names:
   - Login form: was sending `password=...`, should be `key=...` (matching the HTML form's `name="key"`)
   - Generator form: was sending `source_url`, `fit_mode` — should be `url`, `fit` (matching the handler's `r.FormValue()` calls)
   - This means **the manual test script never actually worked** — login always failed silently because the `key` field was empty.

### Full QA Audit Results

The comprehensive QA audit report has been posted as a comment on [issue #24](#24).

Co-authored-by: user <user@Mac.lan guest wan>
Reviewed-on: #25
Co-authored-by: clawbot <clawbot@noreply.example.org>
Co-committed-by: clawbot <clawbot@noreply.example.org>
2026-03-15 17:58:13 +01:00
clawbotandclawbot 2f15340f26 Split Dockerfile: pre-built golangci-lint stage for faster CI (#23)
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## Summary

Splits the Dockerfile into a dedicated lint stage using the pre-built `golangci/golangci-lint:v2.10.1-alpine` Docker image, replacing the manual binary download with curl/sha256 verification.

## Changes

- **Lint stage** (`AS lint`): Uses `golangci/golangci-lint:v2.10.1-alpine` pinned by sha256. Runs `make fmt-check` + `make lint`. Includes CGO deps (`build-base`, `vips-dev`, `libheif-dev`, `pkgconfig`) needed for type-checking govips imports.
- **Build stage** (`AS builder`): Depends on lint stage via `COPY --from=lint /src/go.sum /dev/null`. Runs `make test` + builds the binary. Removes `curl` (no longer needed) and the manual golangci-lint download block.
- **Runtime stage**: Unchanged.

## Benefits

- Eliminates slow multi-arch binary download + sha256 verification step
- Lint and build stages can potentially run in parallel with BuildKit
- Better Docker layer caching — lint deps cached separately from build deps
- All images remain pinned by sha256 with version+date comments

## Verification

- `docker build .` passes: fmt-check , lint (0 issues) , all tests pass , binary builds 

Closes [#18](#18)

<!-- session: agent:sdlc-manager:subagent:7aac9c54-81c8-4494-94ab-0843f97a1e62 -->

Co-authored-by: clawbot <clawbot@noreply.git.eeqj.de>
Reviewed-on: #23
Co-authored-by: clawbot <clawbot@noreply.example.org>
Co-committed-by: clawbot <clawbot@noreply.example.org>
2026-03-02 21:09:51 +01:00