fix(web): match GitHub image colors in pull requests - #9635
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ApprovabilityVerdict: Not approved Macroscope's review found this PR not approvable — This change adds a new end-to-end GitHub image proxy and normalization path spanning shared contracts, signed assets, WebSocket handling, HTTP fetching, and pull-request rendering. The server-side remote fetch and redirect/security controls, together with the new user-facing behavior, warrant human review. You can add or adjust custom eligibility rules. Learn more. |
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🚧 Files skipped from review as they are similar to previous changes (11)
Included review availability: Your plan provides up to 10 included reviews per hour; 8 remain after this review. 📝 WalkthroughWalkthroughAdds end-to-end support for canonical GitHub user attachments. The change validates URLs, issues and resolves signed asset URLs, securely fetches and normalizes images, serves them through the asset route, and adds pull request markdown fallback rendering. ChangesGitHub user attachment support
Estimated code review effort: 4 (Complex) | ~60 minutes Merge Risk: ⚪ Minimal · up to This change adds normalized rendering for supported GitHub attachment PNGs in pull request markdown, with fallback to the original image URL if processing fails. No current merge-blocking risk remains. Sequence Diagram(s)sequenceDiagram
participant PullRequestMarkdown
participant ChatMarkdown
participant assetsCreateUrl
participant assetRouteLayer
participant GitHubAttachmentHost
PullRequestMarkdown->>ChatMarkdown: render canonical GitHub image
ChatMarkdown->>assetsCreateUrl: create signed asset URL
assetsCreateUrl->>assetRouteLayer: request signed asset
assetRouteLayer->>GitHubAttachmentHost: fetch attachment with restricted redirect
GitHubAttachmentHost-->>assetRouteLayer: return image response
assetRouteLayer-->>ChatMarkdown: return image bytes or 502
ChatMarkdown-->>ChatMarkdown: use original URL after asset failure
sequenceDiagram
participant assetRouteLayer
participant loadGitHubUserAttachment
participant GitHubAttachmentHost
assetRouteLayer->>loadGitHubUserAttachment: load attachment URL
loadGitHubUserAttachment->>GitHubAttachmentHost: fetch without automatic redirects
GitHubAttachmentHost-->>loadGitHubUserAttachment: return redirect or image response
loadGitHubUserAttachment->>GitHubAttachmentHost: follow one trusted redirect
loadGitHubUserAttachment-->>assetRouteLayer: return validated bytes and content type
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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Inline comments:
In `@apps/server/src/assets/GitHubUserAttachment.ts`:
- Line 182: Update loadGitHubUserAttachment so both httpClient.get calls use a
bounded request timeout, and apply a bounded body-read timeout when consuming
each response through readLimitedBody. Reuse the project’s established timeout
configuration or duration symbols where available, while preserving the existing
25 MiB limit and redirect behavior.
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apps/server/src/assets/AssetAccess.test.tsapps/server/src/assets/AssetAccess.tsapps/server/src/assets/GitHubUserAttachment.test.tsapps/server/src/assets/GitHubUserAttachment.tsapps/server/src/http.tsapps/server/src/ws.tsapps/web/src/components/ChatMarkdown.tsxapps/web/src/components/ChatMarkdown.workspace-images.test.tsxapps/web/src/components/pullRequest/PullRequestMarkdown.tsxpackages/contracts/src/assets.test.tspackages/contracts/src/assets.ts
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1 participant
Note
🤖 GPT-5.6 Luna on behalf of Oliver
ELI5
Some macOS screenshots look darker in T3 Code's pull request viewer than on GitHub. This normalizes the affected PNG color metadata before display.
Problem
The first screenshot in #9619 contains full-range BT.709
cICPvalues[1, 1, 0, 1]alongside sRGBgAMAandcHRMvalues. A decoder that understandscICPgives it precedence over those fallback chunks, changing the displayed colors. See the PNG color metadata specification.Fix
cICPchunk in place. The compressed pixels and remaining chunks stay unchanged. Other profiles, duplicatecICPchunks, and incomplete chunk data pass through.Why this touches the server and contracts
An
imgcan display a cross-origin attachment, but browser JavaScript needs CORS permission to read its bytes. The affected GitHub attachment's initial redirect does not provide that permission, so normalization needs to run on the environment. CSS cannot select which embedded color profile the image decoder uses.The existing asset system already handles signed URLs, expiry, and resolving an environment's HTTP address for local, remote, and tunnel clients. One new resource variant connects the contract, signing/resolution code, HTTP response, and markdown image loader. This preserves that existing access path and avoids introducing another endpoint or disk cache. Request limits remain necessary because rendering PR markdown now asks the environment to download image bytes.
The change is enabled only in PR markdown on web and desktop. Ordinary chat/file markdown keeps its existing image behavior. Of the 678 added lines, 336 are focused tests; the new loader is 203 lines and performs no image decoding or re-encoding.
UI Changes
GitHub for reference
Before
After
Verification
Initial implementation by GPT-5.6 Sol through Codex in T3 Code. Simplification, conflict resolution, and this description by GPT-6 through Codex.
Note
Proxy GitHub user attachment images through signed asset URLs with PNG color normalization
GitHubUserAttachmentUrlcontract validator and asset resource type so canonicalgithubproxy.fjygbaifeng.eu.org/user-attachments/assetsURLs can be signed and resolved server-sidecICPchunks from PNGs to fix color renderingResolvedAssetis now a discriminated union; all callers ofresolveAssetmust handle thegithub_user_attachmentvariant. The PNG normalizer instripConflictingBt709Cicpmutates response bytes only for an exact BT.709 + sRGB gAMA/cHRM combination, leaving other PNGs unchangedMacroscope summarized c106cc5.
Summary by CodeRabbit
New Features
Bug Fixes