timothyandClaude Opus 4.8
cf834d8b60
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S4 stored-XSS + S9 upload-size DoS from the #197 cold API review. The artwork path trusted client-supplied content types at both ends: upload validated only the declared multipart Content-Type (never decoded the bytes), and serving reflected a client `?contentType=` straight into the response Content-Type on unauthenticated GET sinks (/iptv/logos, /artwork/watermarks). Chain: upload <script> bytes as image/png -> GET ...?contentType=text/html serves them as HTML in-origin. nosniff (#279) does not help because the server explicitly declares text/html. - Upload: derive the content type from the bytes via SkiaSharp SKCodec (header-only, no decode -> no decompression-bomb path); reject non-images 422. New ErsatzTV.Core/Images/ImageContentTypes as the single allow-list source. Dropped the untrusted declared Content-Type from the UploadArtwork command. - Serve: removed the ?contentType= reflection structurally -- dropped ContentType from GetCachedImagePath and the [FromQuery] binding on GetImage/GetWatermark; the handler always sniffs the file, defaulting application/octet-stream. ArtworkContentTypeModel.UrlWithContentType is now the bare path; SPA previews no longer append the query. - Defense-in-depth: channel-logo / watermark {path, contentType} DTOs run through ArtworkContentTypeModel.Sanitized(), blanking non-allow-listed types on write. - S9: Kestrel MaxRequestBodySize from ETV_MAXIMUM_UPLOAD_MB rejects oversized bodies during read (controller file.Length check kept as friendly-error backstop). Both serve sinks are IgnoreApi, so no OpenAPI change. Tests: byte-sniff accept/ reject, Sanitized() allow-list, Location no longer carries ?contentType=. Docs: api-conventions §4a + decisions.md 2026-07-12. Refs #283 #197 #66 Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>