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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 Co-authored-by: clawbot <clawbot@eeqj.de> Co-authored-by: Jeffrey Paul <sneak@noreply.example.org> Reviewed-on: #43 Co-authored-by: clawbot <clawbot@noreply.example.org> Co-committed-by: clawbot <clawbot@noreply.example.org>
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12 KiB