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fix(backend): enforce frontend-host OAuth callback canonicalization - #176
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📝 WalkthroughWalkthroughOAuth redirect URI resolution is refactored to prioritize frontend origins (WEBAPP_FRONTEND_URL) over backend API URLs. The Changes
Estimated code review effort🎯 3 (Moderate) | ⏱️ ~20 minutes Possibly related PRs
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⚠️ Outside diff range comments (2)
packages/backend/tests/integration/routes/health.test.ts (1)
201-221:⚠️ Potential issue | 🟡 MinorRestore the env mutations in this production-path test.
This test changes
NODE_ENV,WEBAPP_REDIRECT_URI,WEBAPP_BACKEND_URL, andWEBAPP_EXPECTED_CLIENT_IDwithout restoring them. Since it is the last test in the file, later suites can inherit production settings and fail nondeterministically.♻️ Suggested fix
test('should keep frontend callback canonical when request hits backend origin', async () => { + const originalNodeEnv = process.env.NODE_ENV + const originalBackendUrl = process.env.WEBAPP_BACKEND_URL + const originalExpectedClientId = process.env.WEBAPP_EXPECTED_CLIENT_ID + const originalRedirectUri = process.env.WEBAPP_REDIRECT_URI + - mockRedis.isHealthy.mockReturnValue(true) - process.env.NODE_ENV = 'production' - delete process.env.WEBAPP_BACKEND_URL - process.env.WEBAPP_EXPECTED_CLIENT_ID = 'test-client-id' - process.env.WEBAPP_REDIRECT_URI = - 'https://lucky-api.lucassantana.tech/api/auth/callback' - - const response = await request(app) - .get('/api/health/auth-config') - .set('x-forwarded-proto', 'https') - .set('x-forwarded-host', 'lucky-api.lucassantana.tech') - .set('Host', 'lucky-api.lucassantana.tech') - .expect(200) - - expect(response.body.warnings).toEqual([]) - expect(response.body.status).toBe('ok') - expect(response.body.auth.redirectUri).toBe( - 'https://lucky.lucassantana.tech/api/auth/callback', - ) + try { + mockRedis.isHealthy.mockReturnValue(true) + process.env.NODE_ENV = 'production' + delete process.env.WEBAPP_BACKEND_URL + process.env.WEBAPP_EXPECTED_CLIENT_ID = 'test-client-id' + process.env.WEBAPP_REDIRECT_URI = + 'https://lucky-api.lucassantana.tech/api/auth/callback' + + const response = await request(app) + .get('/api/health/auth-config') + .set('x-forwarded-proto', 'https') + .set('x-forwarded-host', 'lucky-api.lucassantana.tech') + .set('Host', 'lucky-api.lucassantana.tech') + .expect(200) + + expect(response.body.warnings).toEqual([]) + expect(response.body.status).toBe('ok') + expect(response.body.auth.redirectUri).toBe( + 'https://lucky.lucassantana.tech/api/auth/callback', + ) + } finally { + process.env.NODE_ENV = originalNodeEnv + if (originalBackendUrl) { + process.env.WEBAPP_BACKEND_URL = originalBackendUrl + } else { + delete process.env.WEBAPP_BACKEND_URL + } + if (originalExpectedClientId) { + process.env.WEBAPP_EXPECTED_CLIENT_ID = originalExpectedClientId + } else { + delete process.env.WEBAPP_EXPECTED_CLIENT_ID + } + if (originalRedirectUri) { + process.env.WEBAPP_REDIRECT_URI = originalRedirectUri + } else { + delete process.env.WEBAPP_REDIRECT_URI + } + } })🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed. In `@packages/backend/tests/integration/routes/health.test.ts` around lines 201 - 221, The test "should keep frontend callback canonical when request hits backend origin" mutates process.env (NODE_ENV, WEBAPP_REDIRECT_URI, WEBAPP_BACKEND_URL, WEBAPP_EXPECTED_CLIENT_ID) and doesn't restore them; save the original values before changing and restore them after the test (either in a finally block inside the test or using afterEach/afterAll) so other tests are not affected; reference the test by its title and the environment variable names to find and fix the code.packages/backend/src/utils/oauthRedirectUri.ts (1)
43-93:⚠️ Potential issue | 🟠 MajorDon't canonicalize to the localhost fallback when
WEBAPP_FRONTEND_URLis unset.
getFrontendOrigins()falls back tohttp://localhost:5173, so in production a legacyWEBAPP_REDIRECT_URI=https://.../api/auth/callbackplus a blank/missingWEBAPP_FRONTEND_URLnow gets rewritten to localhost. That URI is then stored in session and later sent to Discord asredirect_uri, which breaks the OAuth flow instead of falling back to the configured callback. Only canonicalize when a real frontend origin was explicitly configured, and add a regression test for the unset/blank case.🛠️ Suggested fix
+const getConfiguredFrontendOrigins = (): string[] => + (process.env.WEBAPP_FRONTEND_URL ?? '') + .split(',') + .map((origin) => origin.trim()) + .filter((origin) => origin.length > 0) + const resolvePrimaryFrontendCallbackUri = (): string | undefined => { - const frontendOrigin = getFrontendOrigins().find((origin) => { + const frontendOrigin = getConfiguredFrontendOrigins().find((origin) => { try { new URL(origin) return true @@ try { const parsedRedirect = new URL(normalized) + const configuredFrontendOrigins = getConfiguredFrontendOrigins() + + if (configuredFrontendOrigins.length === 0) { + return normalized + } + const frontendOrigins = new Set( - getFrontendOrigins().map((origin) => { + configuredFrontendOrigins.map((origin) => { try { return new URL(origin).origin } catch {🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed. In `@packages/backend/src/utils/oauthRedirectUri.ts` around lines 43 - 93, resolveEnvRedirectUri is incorrectly treating the localhost fallback from getFrontendOrigins() as a valid canonical frontend origin when WEBAPP_FRONTEND_URL is unset, causing production redirects to be rewritten to http://localhost:5173; update resolveEnvRedirectUri to only attempt canonicalization against frontend origins when an explicit WEBAPP_FRONTEND_URL (non-empty) was provided (i.e., check process.env.WEBAPP_FRONTEND_URL truthiness before building frontendOrigins and comparing parsedRedirect.origin), otherwise return the normalized WEBAPP_REDIRECT_URI directly; keep resolvePrimaryFrontendCallbackUri and normalizeCallbackPath usage the same and add a regression test that sets WEBAPP_REDIRECT_URI but leaves WEBAPP_FRONTEND_URL undefined/empty to assert the function returns the normalized redirect and does not canonicalize to localhost.
🤖 Prompt for all review comments with AI agents
Verify each finding against the current code and only fix it if needed.
Outside diff comments:
In `@packages/backend/src/utils/oauthRedirectUri.ts`:
- Around line 43-93: resolveEnvRedirectUri is incorrectly treating the localhost
fallback from getFrontendOrigins() as a valid canonical frontend origin when
WEBAPP_FRONTEND_URL is unset, causing production redirects to be rewritten to
http://localhost:5173; update resolveEnvRedirectUri to only attempt
canonicalization against frontend origins when an explicit WEBAPP_FRONTEND_URL
(non-empty) was provided (i.e., check process.env.WEBAPP_FRONTEND_URL truthiness
before building frontendOrigins and comparing parsedRedirect.origin), otherwise
return the normalized WEBAPP_REDIRECT_URI directly; keep
resolvePrimaryFrontendCallbackUri and normalizeCallbackPath usage the same and
add a regression test that sets WEBAPP_REDIRECT_URI but leaves
WEBAPP_FRONTEND_URL undefined/empty to assert the function returns the
normalized redirect and does not canonicalize to localhost.
In `@packages/backend/tests/integration/routes/health.test.ts`:
- Around line 201-221: The test "should keep frontend callback canonical when
request hits backend origin" mutates process.env (NODE_ENV, WEBAPP_REDIRECT_URI,
WEBAPP_BACKEND_URL, WEBAPP_EXPECTED_CLIENT_ID) and doesn't restore them; save
the original values before changing and restore them after the test (either in a
finally block inside the test or using afterEach/afterAll) so other tests are
not affected; reference the test by its title and the environment variable names
to find and fix the code.
ℹ️ Review info
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Configuration used: Organization UI
Review profile: CHILL
Plan: Pro
Run ID: 69da33f3-03cd-4a43-a22e-8fcdc06875d4
📒 Files selected for processing (4)
packages/backend/src/utils/oauthRedirectUri.tspackages/backend/tests/integration/routes/auth.test.tspackages/backend/tests/integration/routes/health.test.tspackages/backend/tests/unit/utils/oauthRedirectUri.test.ts
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Files:
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Files:
packages/backend/tests/integration/routes/health.test.tspackages/backend/src/utils/oauthRedirectUri.tspackages/backend/tests/unit/utils/oauthRedirectUri.test.tspackages/backend/tests/integration/routes/auth.test.ts
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packages/backend/tests/integration/routes/health.test.tspackages/backend/src/utils/oauthRedirectUri.tspackages/backend/tests/unit/utils/oauthRedirectUri.test.tspackages/backend/tests/integration/routes/auth.test.ts
**/*.{test,spec}.{ts,tsx,js,jsx}
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packages/backend/tests/integration/routes/health.test.tspackages/backend/tests/unit/utils/oauthRedirectUri.test.tspackages/backend/tests/integration/routes/auth.test.ts
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packages/backend/tests/integration/routes/health.test.tspackages/backend/src/utils/oauthRedirectUri.tspackages/backend/tests/unit/utils/oauthRedirectUri.test.tspackages/backend/tests/integration/routes/auth.test.ts
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packages/backend/tests/integration/routes/health.test.tspackages/backend/tests/unit/utils/oauthRedirectUri.test.tspackages/backend/tests/integration/routes/auth.test.ts
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packages/backend/**/*.ts: Apply.cursor/rules/lucky-backend-api.mdcfor structure and conventions when acting as backend specialist
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Files:
packages/backend/tests/integration/routes/health.test.tspackages/backend/src/utils/oauthRedirectUri.tspackages/backend/tests/unit/utils/oauthRedirectUri.test.tspackages/backend/tests/integration/routes/auth.test.ts
packages/backend/tests/**/*.ts
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Follow existing patterns for unit and integration tests in
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packages/backend/tests/integration/routes/health.test.tspackages/backend/tests/unit/utils/oauthRedirectUri.test.tspackages/backend/tests/integration/routes/auth.test.ts
packages/backend/src/**/*.ts
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packages/backend/src/**/*.ts: Validation must use Zod schemas inbackend/src/schemas/and be applied viavalidateBody,validateParams, orvalidateQuery
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Files:
packages/backend/src/utils/oauthRedirectUri.ts
packages/backend/src/**/*.{ts,tsx}
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packages/backend/src/**/*.{ts,tsx}: Use shared config and env from@lucky/sharedwhen needed; avoid duplicating env parsing in backend code
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Files:
packages/backend/src/utils/oauthRedirectUri.ts
🧠 Learnings (20)
📓 Common learnings
Learnt from: CR
Repo: LucasSantana-Dev/Lucky PR: 0
File: .cursor/rules/lucky-frontend.mdc:0-0
Timestamp: 2026-03-09T20:20:56.356Z
Learning: Applies to packages/frontend/src/**/*.{ts,tsx} : Do not depend on `lucky/shared` package in frontend code; make API calls to backend via configured base URL (env)
Learnt from: CR
Repo: LucasSantana-Dev/Lucky PR: 0
File: .cursor/rules/lucky-backend-api.mdc:0-0
Timestamp: 2026-03-09T20:20:38.694Z
Learning: Applies to packages/backend/src/{services,middleware}/**/*.{ts,tsx} : Implement Discord OAuth for authentication in backend services
📚 Learning: 2026-03-09T20:21:31.459Z
Learnt from: CR
Repo: LucasSantana-Dev/Lucky PR: 0
File: .cursor/rules/quality.mdc:0-0
Timestamp: 2026-03-09T20:21:31.459Z
Learning: Applies to src/**/*.{ts,tsx,js,jsx} : Implement health/readiness endpoints in backend services
Applied to files:
packages/backend/tests/integration/routes/health.test.ts
📚 Learning: 2026-03-09T20:21:38.098Z
Learnt from: CR
Repo: LucasSantana-Dev/Lucky PR: 0
File: .cursor/rules/subagent-backend.mdc:0-0
Timestamp: 2026-03-09T20:21:38.098Z
Learning: Applies to packages/backend/tests/**/*.ts : Follow existing patterns for unit and integration tests in `packages/backend/tests/`
Applied to files:
packages/backend/tests/integration/routes/health.test.tspackages/backend/tests/unit/utils/oauthRedirectUri.test.tspackages/backend/tests/integration/routes/auth.test.ts
📚 Learning: 2026-03-09T20:20:38.694Z
Learnt from: CR
Repo: LucasSantana-Dev/Lucky PR: 0
File: .cursor/rules/lucky-backend-api.mdc:0-0
Timestamp: 2026-03-09T20:20:38.694Z
Learning: Applies to packages/backend/tests/**/*.{ts,tsx} : Organize tests in `packages/backend/tests/` with unit tests under `unit/` and integration tests under `integration/`, following existing patterns with fixtures and setup
Applied to files:
packages/backend/tests/integration/routes/health.test.tspackages/backend/tests/unit/utils/oauthRedirectUri.test.tspackages/backend/tests/integration/routes/auth.test.ts
📚 Learning: 2026-03-09T20:21:08.612Z
Learnt from: CR
Repo: LucasSantana-Dev/Lucky PR: 0
File: .cursor/rules/lucky-project.mdc:0-0
Timestamp: 2026-03-09T20:21:08.612Z
Learning: Applies to {packages/*/tests/**/*.test.{js,ts},tests/**/*.test.{js,ts}} : Add or adjust unit and integration tests when changing behavior; follow existing patterns in `packages/*/tests` and root `tests/` directories
Applied to files:
packages/backend/tests/integration/routes/health.test.tspackages/backend/tests/unit/utils/oauthRedirectUri.test.tspackages/backend/tests/integration/routes/auth.test.ts
📚 Learning: 2026-03-09T20:20:56.356Z
Learnt from: CR
Repo: LucasSantana-Dev/Lucky PR: 0
File: .cursor/rules/lucky-frontend.mdc:0-0
Timestamp: 2026-03-09T20:20:56.356Z
Learning: Applies to packages/frontend/src/**/*.{ts,tsx} : Do not depend on `lucky/shared` package in frontend code; make API calls to backend via configured base URL (env)
Applied to files:
packages/backend/tests/integration/routes/health.test.tspackages/backend/src/utils/oauthRedirectUri.tspackages/backend/tests/unit/utils/oauthRedirectUri.test.tspackages/backend/tests/integration/routes/auth.test.ts
📚 Learning: 2026-03-09T20:20:56.356Z
Learnt from: CR
Repo: LucasSantana-Dev/Lucky PR: 0
File: .cursor/rules/lucky-frontend.mdc:0-0
Timestamp: 2026-03-09T20:20:56.356Z
Learning: Applies to packages/frontend/tests/**/*.{ts,tsx,js} : Write tests in `packages/frontend/tests/` using existing test patterns (e.g., Playwright for e2e if configured)
Applied to files:
packages/backend/tests/integration/routes/health.test.tspackages/backend/tests/unit/utils/oauthRedirectUri.test.tspackages/backend/tests/integration/routes/auth.test.ts
📚 Learning: 2026-03-09T20:21:31.459Z
Learnt from: CR
Repo: LucasSantana-Dev/Lucky PR: 0
File: .cursor/rules/quality.mdc:0-0
Timestamp: 2026-03-09T20:21:31.459Z
Learning: Applies to tests/**/*.test.{ts,tsx,js,jsx} : Add integration tests where appropriate
Applied to files:
packages/backend/tests/integration/routes/health.test.tspackages/backend/tests/integration/routes/auth.test.ts
📚 Learning: 2026-03-09T20:21:31.459Z
Learnt from: CR
Repo: LucasSantana-Dev/Lucky PR: 0
File: .cursor/rules/quality.mdc:0-0
Timestamp: 2026-03-09T20:21:31.459Z
Learning: Applies to tests/**/*.test.ts : Integration tests must use naming convention `*.test.ts` and be located inside a `/tests` folder at the project's root
Applied to files:
packages/backend/tests/integration/routes/health.test.tspackages/backend/tests/integration/routes/auth.test.ts
📚 Learning: 2026-03-09T20:21:31.459Z
Learnt from: CR
Repo: LucasSantana-Dev/Lucky PR: 0
File: .cursor/rules/quality.mdc:0-0
Timestamp: 2026-03-09T20:21:31.459Z
Learning: Applies to **/*.{spec,test}.{ts,tsx,js,jsx} : Test behavior, not implementation details
Applied to files:
packages/backend/tests/integration/routes/health.test.tspackages/backend/tests/unit/utils/oauthRedirectUri.test.tspackages/backend/tests/integration/routes/auth.test.ts
📚 Learning: 2026-03-09T20:21:31.459Z
Learnt from: CR
Repo: LucasSantana-Dev/Lucky PR: 0
File: .cursor/rules/quality.mdc:0-0
Timestamp: 2026-03-09T20:21:31.459Z
Learning: Applies to src/**/*.{ts,tsx,js,jsx} : Add performance metrics and monitoring for backend services
Applied to files:
packages/backend/tests/integration/routes/health.test.ts
📚 Learning: 2026-03-09T20:20:38.694Z
Learnt from: CR
Repo: LucasSantana-Dev/Lucky PR: 0
File: .cursor/rules/lucky-backend-api.mdc:0-0
Timestamp: 2026-03-09T20:20:38.694Z
Learning: Applies to packages/backend/src/**/*.{ts,tsx} : Use shared config and env from `lucky/shared` when needed; avoid duplicating env parsing in backend code
Applied to files:
packages/backend/tests/integration/routes/health.test.tspackages/backend/tests/integration/routes/auth.test.ts
📚 Learning: 2026-03-09T20:21:58.991Z
Learnt from: CR
Repo: LucasSantana-Dev/Lucky PR: 0
File: .cursor/rules/subagent-frontend.mdc:0-0
Timestamp: 2026-03-09T20:21:58.991Z
Learning: Keep frontend code scoped to `packages/frontend`; communicate with backend via `services/api.ts` using the configured env base URL; do not access shared database or Redis directly
Applied to files:
packages/backend/tests/integration/routes/health.test.tspackages/backend/src/utils/oauthRedirectUri.tspackages/backend/tests/integration/routes/auth.test.ts
📚 Learning: 2026-03-09T20:20:38.694Z
Learnt from: CR
Repo: LucasSantana-Dev/Lucky PR: 0
File: .cursor/rules/lucky-backend-api.mdc:0-0
Timestamp: 2026-03-09T20:20:38.694Z
Learning: Applies to packages/backend/src/{services,middleware}/**/*.{ts,tsx} : Implement Discord OAuth for authentication in backend services
Applied to files:
packages/backend/src/utils/oauthRedirectUri.ts
📚 Learning: 2026-03-09T20:21:58.991Z
Learnt from: CR
Repo: LucasSantana-Dev/Lucky PR: 0
File: .cursor/rules/subagent-frontend.mdc:0-0
Timestamp: 2026-03-09T20:21:58.991Z
Learning: Write unit and integration tests in `packages/frontend/tests`; use Playwright for E2E tests when changing user flows
Applied to files:
packages/backend/tests/unit/utils/oauthRedirectUri.test.tspackages/backend/tests/integration/routes/auth.test.ts
📚 Learning: 2026-03-09T20:22:47.453Z
Learnt from: CR
Repo: LucasSantana-Dev/Lucky PR: 0
File: AGENTS.md:0-0
Timestamp: 2026-03-09T20:22:47.453Z
Learning: Add or adjust unit/integration tests in `packages/*/tests` and root `tests/` when changing behavior; follow existing patterns in the repository
Applied to files:
packages/backend/tests/unit/utils/oauthRedirectUri.test.ts
📚 Learning: 2026-03-09T20:21:08.612Z
Learnt from: CR
Repo: LucasSantana-Dev/Lucky PR: 0
File: .cursor/rules/lucky-project.mdc:0-0
Timestamp: 2026-03-09T20:21:08.612Z
Learning: Applies to **/*.{js,ts,tsx,jsx} : Store secrets, ports, and hosts in environment variables (`.env`, `.env.example`) and never hardcode them
Applied to files:
packages/backend/tests/integration/routes/auth.test.ts
📚 Learning: 2026-03-09T20:20:38.694Z
Learnt from: CR
Repo: LucasSantana-Dev/Lucky PR: 0
File: .cursor/rules/lucky-backend-api.mdc:0-0
Timestamp: 2026-03-09T20:20:38.694Z
Learning: Applies to packages/backend/src/**/*.{ts,tsx} : Keep tokens and secrets in environment variables only; never hardcode or expose in code
Applied to files:
packages/backend/tests/integration/routes/auth.test.ts
📚 Learning: 2026-03-09T20:20:56.356Z
Learnt from: CR
Repo: LucasSantana-Dev/Lucky PR: 0
File: .cursor/rules/lucky-frontend.mdc:0-0
Timestamp: 2026-03-09T20:20:56.356Z
Learning: Applies to packages/frontend/src/{main,App}.tsx : Entry point for the Lucky Frontend React app is `packages/frontend/src/main.tsx` which connects to `App.tsx`
Applied to files:
packages/backend/tests/integration/routes/auth.test.ts
📚 Learning: 2026-03-09T20:22:47.453Z
Learnt from: CR
Repo: LucasSantana-Dev/Lucky PR: 0
File: AGENTS.md:0-0
Timestamp: 2026-03-09T20:22:47.453Z
Learning: Do not hardcode secrets, IPs, or ports; use `.env` and `docs/` for required variables
Applied to files:
packages/backend/tests/integration/routes/auth.test.ts
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Summary
https://lucky.lucassantana.tech/api/auth/callback)WEBAPP_REDIRECT_URIis legacy API-domainRoot cause
Changes
oauthRedirectUrito:Verification
npm run test --workspace=packages/backend -- oauthRedirectUrinpm run test --workspace=packages/backend -- auth.test.tsnpm run test --workspace=packages/backend -- health.test.tsNotes
npm run lint --workspace=packages/backendcurrently fails on pre-existing unrelated route typing issues in this baseline.npm run type:check --workspace=packages/backendcurrently fails on pre-existing monorepo build/type baseline issues unrelated to this change.