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

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+# OpenSpec Change: enterprise-server-caddy-imgproxy
+
+- **Change ID**: enterprise-server-caddy-imgproxy
+- **Package**: `@suaveplan/caddy-imgproxy`
+- **Category**: server/infra
+- **Target path**: `server/infra/caddy-imgproxy`
+- **Status**: PROPOSED
+- **Date**: 2026-04-24
+- **Reference spec**: `/mnt/s/web/suaveplan/enterprise/caddy-imgproxy.md`
+
+---
+
+## Summary
+
+Deliver `@suaveplan/caddy-imgproxy` on the genesis branch from scratch at enterprise quality. The package provides a typed TypeScript client and URL-builder for [imgproxy](https://imgproxy.net/) behind a Caddy reverse proxy. It generates HMAC-SHA256 signed imgproxy URLs for resize, crop, format conversion, quality, watermark, blur, and brightness operations. It does not spawn processes — it is a pure URL-generation and request-signing library with injectable `@suaveplan/crypto` for signing and Zod-validated option schemas.
+
+---
+
+## Current-state audit (genesis)
+
+Does not exist on genesis — fresh build.
+
+---
+
+## Available workspace deps on genesis
+
+| Package | Role |
+|---|---|
+| `@suaveplan/error` (`workspace:^`) | Typed `IMGPROXY.*` error codes |
+| `@suaveplan/types` (`workspace:^`) | `LoggerLike` |
+| `@suaveplan/crypto` (`workspace:^`) | HMAC-SHA256 signing |
+| `zod` (`catalog:forms`) | Options validation |
+| `@opentelemetry/api` (`catalog:observability`) | Counters |
+| `tslib` (`catalog:build`) | Runtime helpers |
+
+---
+
+## Public API surface
+
+```ts
+class ImgproxyUrlBuilder {
+  constructor(options: ImgproxyOptions)
+  build(options: ImgproxyTransformOptions): string
+  buildSigned(options: ImgproxyTransformOptions): string
+}
+
+function createImgproxyUrlBuilder(options: ImgproxyOptions): ImgproxyUrlBuilder
+
+interface ImgproxyOptions {
+  baseUrl: string
+  key?: string        // hex-encoded signing key
+  salt?: string       // hex-encoded salt
+  defaultQuality?: number
+}
+
+interface ImgproxyTransformOptions {
+  src: string         // source image URL or S3 path
+  width?: number
+  height?: number
+  resizingType?: 'fit' | 'fill' | 'crop' | 'pad' | 'auto'
+  format?: 'webp' | 'avif' | 'jpeg' | 'png' | 'gif' | 'ico' | 'svg'
+  quality?: number
+  blur?: number
+  brightness?: number
+  contrast?: number
+  gravity?: 'sm' | 'ce' | 'no' | 'so' | 'ea' | 'we' | 'noea' | 'nowe' | 'soea' | 'sowe' | 'fp'
+  watermark?: WatermarkOptions
+  dpr?: number
+  enlarge?: boolean
+  extend?: boolean
+}
+
+interface WatermarkOptions {
+  opacity: number
+  position?: string
+  xOffset?: number
+  yOffset?: number
+  scale?: number
+}
+
+const ImgproxyOptionsSchema: z.ZodSchema<ImgproxyOptions>
+const ImgproxyTransformOptionsSchema: z.ZodSchema<ImgproxyTransformOptions>
+
+type ImgproxyErrorCode =
+  | 'IMGPROXY_INVALID_OPTIONS'
+  | 'IMGPROXY_SIGN_FAILED'
+  | 'IMGPROXY_INVALID_SOURCE_URL'
+
+function registerImgproxyErrorCodes(): void
+```
+
+---
+
+## File layout
+
+```text
+server/infra/caddy-imgproxy/
+  package.json
+  tsconfig.json
+  vitest.config.ts
+  src/
+    index.ts
+    error-codes.ts
+    constants/index.ts
+    types/
+      imgproxy.types.ts
+      imgproxy.types.md
+    builder/
+      imgproxy-url-builder/
+        imgproxy-url-builder.ts
+        imgproxy-url-builder.md
+        imgproxy-url-builder.types.ts
+        imgproxy-url-builder.test.ts
+        index.ts
+    utils/
+      path-encoder.ts
+      path-encoder.md
+      path-encoder.test.ts
+  tests/
+    integration.test.ts
+```
+
+---
+
+## Impact
+
+Downstream: any package needing image transformation URLs (file upload API, media service, CDN pipeline). Pure URL generation — no network required.
+
+**Prerequisites on Verdaccio**: `@suaveplan/error`, `@suaveplan/types`, `@suaveplan/crypto`.

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/`.