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openspec/changes/enterprise-server-caddy-imgproxy/tasks.md

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+# Tasks: enterprise-server-caddy-imgproxy
+
+**Change ID**: enterprise-server-caddy-imgproxy
+**Package**: `@suaveplan/caddy-imgproxy`
+**Target path**: `server/infra/caddy-imgproxy`
+**Prerequisites on Verdaccio**: `@suaveplan/error`, `@suaveplan/types`, `@suaveplan/crypto`
+
+---
+
+## 0. Pre-flight (non-negotiable)
+
+- [ ] 0.1 Confirm clean working tree (`git status` reports nothing) and no in-flight worktrees with uncommitted work (`git worktree list` then `git status` in each)
+- [ ] 0.2 If any worktrees exist under `.claude/worktrees/`, account for each one: still-active agent, work-pending-merge, or stale-and-prune. Stale worktrees MUST be removed (`git worktree remove`) before opening a new one — code that has been lost twice on main is the failure mode this guards against.
+- [ ] 0.3 Confirm the package set in `MANIFEST.md` matches `find packages -maxdepth 3 -name package.json` count. Drift here means a prior change archived without regenerating the manifest.
+
+## 1. Scaffold
+
+- [ ] Create directory tree per `proposal.md`.
+- [ ] `package.json` at `0.1.0`, `"sideEffects": false`, exports `"."` + `builder` + `utils/path-encoder`.
+- [ ] Deps: `@suaveplan/error workspace:^`, `@suaveplan/types workspace:^`, `@suaveplan/crypto workspace:^`, `zod catalog:forms`, `@opentelemetry/api catalog:observability`, `tslib catalog:build`.
+- [ ] DevDeps: `vitest catalog:testing`, `@vitest/coverage-istanbul catalog:testing`, `@suaveplan/testing workspace:^`.
+- [ ] `tsconfig.json` extending `library.json`; `vitest.config.ts` with `createTestConfig()`.
+- [ ] Scripts: `lint`, `typecheck`, `test`, `test:coverage`, `build`, `docs:check`.
+
+## 2. Types and errors
+
+- [ ] Define all option interfaces and Zod schemas in `src/types/imgproxy.types.ts`.
+- [ ] Write `imgproxy.types.md` (≥200 words, both examples, API reference).
+- [ ] `src/error-codes.ts`: three codes; `registerImgproxyErrorCodes()`; eager call.
+
+## 3. Path encoder utility
+
+- [ ] Implement `src/utils/path-encoder.ts`:
+  - `encodeSourceUrl(url: string): string` — URL-safe base64 encode of source URL; throw `IMGPROXY_INVALID_SOURCE_URL` on empty/invalid input.
+  - `buildProcessingPath(opts: ImgproxyTransformOptions): string` — assemble the imgproxy processing chain string (e.g. `rs:fit:800:600/q:80/f:webp/...`).
+- [ ] Write `path-encoder.test.ts`: each processing option produces correct segment; empty source throws; combined options produce correct path.
+- [ ] Write `path-encoder.md` (≥200 words).
+
+## 4. URL builder
+
+- [ ] Implement `ImgproxyUrlBuilder` in `src/builder/imgproxy-url-builder/imgproxy-url-builder.ts`:
+  - `build(opts)`: validate via `ImgproxyTransformOptionsSchema`; call `buildProcessingPath`; encode source; return `${baseUrl}/insecure/${processingPath}/${encodedSource}`.
+  - `buildSigned(opts)`: same path; compute HMAC-SHA256 signature using `@suaveplan/crypto` with key/salt; return `${baseUrl}/${signature}/${processingPath}/${encodedSource}`. Throw `IMGPROXY_SIGN_FAILED` if key/salt not configured.
+  - OTel counter `imgproxy.urls_built_total` with `signed` attribute.
+- [ ] Export `createImgproxyUrlBuilder(options)`.
+- [ ] Write `imgproxy-url-builder.types.ts`.
+- [ ] Write `imgproxy-url-builder.test.ts` (≤500 lines): unsigned URL format, signed URL HMAC verification against known test vector from imgproxy docs, all transform options produce correct segments, invalid options throw typed error.
+- [ ] Write `imgproxy-url-builder.md` (≥200 words, simple + advanced, API reference).
+
+## 5. Integration tests
+
+- [ ] `tests/integration.test.ts`: build several real URLs and verify they match known imgproxy signature test vectors; verify path encoding round-trips; signed vs unsigned URL format diff.
+
+## 6. Docs + verify + publish
+
+- [ ] Root `README.md`: docker-compose Caddy + imgproxy example, quick-start URL building, API table, signing setup.
+- [ ] `bunx turbo lint --filter=@suaveplan/caddy-imgproxy` — zero errors.
+- [ ] `bunx turbo typecheck --filter=@suaveplan/caddy-imgproxy` — zero errors.
+- [ ] `bunx turbo test --filter=@suaveplan/caddy-imgproxy` — all pass.
+- [ ] `bunx turbo test:coverage --filter=@suaveplan/caddy-imgproxy` — 100%.
+- [ ] `bun scripts/publish.ts --package @suaveplan/caddy-imgproxy`.
+- [ ] Update `CLAUDE.md`; archive to `openspec/archive/2026-04-24-enterprise-server-caddy-imgproxy/`.