🔒 Fix fallback of allowedOrigin to localhost in production#381
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Co-authored-by: is0692vs <135803462+is0692vs@users.noreply.github.com>
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Code Review
This pull request improves environment variable validation in the card API route by returning a 500 error in production if the APP_URL environment variable is not configured. The reviewer suggested trimming APP_URL to prevent issues with accidental leading or trailing whitespace.
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| const url = new URL(request.url); | ||
| const options = parseCardQueryParams(url.searchParams); | ||
| const allowedOrigin = process.env.APP_URL || "http://localhost:3000"; | ||
| let allowedOrigin = process.env.APP_URL; |
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Trimming the APP_URL environment variable prevents potential issues caused by accidental leading or trailing whitespace in configuration files, which could otherwise result in malformed font URLs or failed origin validation checks.
| let allowedOrigin = process.env.APP_URL; | |
| let allowedOrigin = process.env.APP_URL?.trim(); |
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| let allowedOrigin = process.env.APP_URL; | ||
| if (!allowedOrigin) { | ||
| if (process.env.NODE_ENV === "production") { | ||
| return new Response("Server configuration error: APP_URL environment variable is not set", { status: 500 }); |
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APP_URL) がそのまま含まれており、クライアントに不要な実装詳細を公開しています。攻撃者が設定ミスをスキャンする際のヒントになり得るため、汎用的なメッセージに留めることを推奨します。
| return new Response("Server configuration error: APP_URL environment variable is not set", { status: 500 }); | |
| return new Response("Server configuration error", { status: 500 }); |
Prompt To Fix With AI
This is a comment left during a code review.
Path: src/app/api/card/[username]/route.ts
Line: 23
Comment:
エラーレスポンスのボディに内部の環境変数名 (`APP_URL`) がそのまま含まれており、クライアントに不要な実装詳細を公開しています。攻撃者が設定ミスをスキャンする際のヒントになり得るため、汎用的なメッセージに留めることを推奨します。
```suggestion
return new Response("Server configuration error", { status: 500 });
```
How can I resolve this? If you propose a fix, please make it concise.Note: If this suggestion doesn't match your team's coding style, reply to this and let me know. I'll remember it for next time!
| let allowedOrigin = process.env.APP_URL; | ||
| if (!allowedOrigin) { | ||
| if (process.env.NODE_ENV === "production") { | ||
| return new Response("Server configuration error: APP_URL environment variable is not set", { status: 500 }); |
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このエンドポイントの他のすべてのエラーパス（429・404・503）は renderErrorCardResponse を通じて SVG カードを返しますが、この 500 レスポンスのみプレーンテキストを返します。クライアント（<img> タグ等）が常に SVG を期待している場合、APP_URL が未設定の本番環境でデプロイされたとき破損した表示になります。renderErrorCardResponse で統一するか、Content-Type: image/svg+xml を明示することを検討してください。
Prompt To Fix With AI
This is a comment left during a code review.
Path: src/app/api/card/[username]/route.ts
Line: 23
Comment:
**レスポンス形式の不整合**
このエンドポイントの他のすべてのエラーパス（429・404・503）は `renderErrorCardResponse` を通じて SVG カードを返しますが、この 500 レスポンスのみプレーンテキストを返します。クライアント（`<img>` タグ等）が常に SVG を期待している場合、`APP_URL` が未設定の本番環境でデプロイされたとき破損した表示になります。`renderErrorCardResponse` で統一するか、`Content-Type: image/svg+xml` を明示することを検討してください。
How can I resolve this? If you propose a fix, please make it concise.1 participant
🎯 What: The vulnerability fixed
In
src/app/api/card/[username]/route.ts, if theAPP_URLenvironment variable is not explicitly set, theallowedOriginfalls back tohttp://localhost:3000.This insecure fallback might cause fonts or other internal fetch requests to hit a local developer endpoint instead of the intended service in production environments. Crucially, this variable is used via
renderCardResponseas the trustedallowedOrigininisTrustedFontUrl(invalidators.ts), potentially meaning that the production environment would implicitly trustlocalhost:3000URLs when it shouldn't.🛡️ Solution: How the fix addresses the vulnerability
The code now properly verifies the presence of the
APP_URLenvironment variable. IfAPP_URLis empty and the environment isproduction, the server now explicitly returns a500 Server configuration error. In non-production environments, it safely falls back tohttp://localhost:3000.PR created automatically by Jules for task 9766932802489647517 started by @is0692vs
Greptile Summary
本番環境で
APP_URL環境変数が未設定の場合にlocalhost:3000へフォールバックしていた問題を修正するPRです。NODE_ENV === \"production\"のときは明示的に 500 を返し、それ以外の環境では従来通りlocalhost:3000にフォールバックします。APP_URLが未設定かつ本番環境の場合、500 エラーを即時返却するよう変更。http://localhost:3000へのフォールバックを許容。Confidence Score: 4/5
変更は1ファイル・数行のみで、本番環境での設定ミスを早期に検出するための防御的なガードです。マージ自体のリスクは低い。
修正は意図通りに機能しており、ロジックも明確です。ただし 500 レスポンスのボディが内部環境変数名を公開している点と、他のエラーレスポンスと形式が異なる点（プレーンテキスト vs SVG カード）が残っています。
src/app/api/card/[username]/route.ts — 500 エラーのレスポンス形式とメッセージ内容を確認してください。
Security Review
APP_URLがそのまま含まれており、設定ミスの詳細をクライアントに公開しています。汎用的なメッセージ（例:"Server configuration error"）に変更することを推奨します。isTrustedFontUrlは HTTPS のみを許可し、getTrustedFontOriginsも HTTPS オリジンのみをホワイトリストに追加するため、旧来のhttp://localhost:3000フォールバックは実際には信頼済みオリジンとして機能しなかった点に注意してください。今回の修正は防御的に正しい方向ですが、実際の悪用経路は限定的でした。Important Files Changed
Flowchart
%%{init: {'theme': 'neutral'}}%% flowchart TD A[GET /api/card/:username] --> B[process.env.APP_URL 取得] B --> C{APP_URL は設定済み?} C -- はい --> G[allowedOrigin = APP_URL] C -- いいえ --> D{NODE_ENV === production?} D -- はい --> E[500 Server configuration error を返す] D -- いいえ 開発環境 --> F[allowedOrigin = http://localhost:3000] F --> G G --> H[fontUrl 組み立て] H --> I{レートリミット超過?} I -- はい --> J[renderErrorCardResponse 429] I -- いいえ --> K[fetchCardData] K --> L{data あり?} L -- いいえ --> M[renderErrorCardResponse 404] L -- はい --> N[renderCardResponse 200] K -- 例外 --> O[renderErrorCardResponse 503]Prompt To Fix All With AI
Reviews (1): Last reviewed commit: "Fix APP_URL environment variable fallbac..." | Re-trigger Greptile