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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`.