feat: backend-oauth-consent-screen

[Zaimwa9]

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• I have read the Contributing Guide.
• I have added information to docs/ if required so people know about the feature.
• I have filled in the "Changes" section below.
• I have filled in the "How did you test this code" section below.

Changes

Contributes to #7042
Adds a custom OAuth authorisation endpoint (GET/POST /api/v1/oauth/authorize/) that replaces DOT's template based AuthorizationView with a JSON API the frontend consent screen can call.

GET /api/v1/oauth/authorize/
Validates an OAuth authorisation request and returns application info:

{
  "application": { "name": "My App", "client_id": "abc123" },
  "scopes": { "mcp": "MCP access" },
  "redirect_uri": "https://example.com/callback",
  "is_verified": false
}

POST /api/v1/oauth/authorize/
Processes the user's consent decision and returns the redirect URI with an authorisation code (allow) or error=access_denied (deny):
{ "redirect_uri": "https://example.com/callback?code=...&state=..." }

Implementation details

• OAuthAuthorizeView combines DRF's APIView with DOT's OAuthLibMixin to bridge token auth with DOT's
  session-based internals.
• POST injects OAuth params into request._request.GET and META['QUERY_STRING'] so DOT's
  validate_authorization_request can read them (DOT expects a form-based flow). This is documented with a
  comment noting fragility on DOT upgrades.
• is_verified maps to DOT's skip_authorization field, with a comment explaining it's safe since this
  custom view always shows the consent screen.
• OAuthConsentSerializer validates the POST body.
• DOT's built-in /o/authorize/ is no longer exposed — only /o/token/, /o/revoke_token/, and /o/introspect/
  remain.

How did you test this code?

• New tests

Manual end-to-end testing:

1. Created an OAuth application via DCR:

curl -X POST http://localhost:8000/o/register/ \
    -H "Content-Type: application/json" \
    -d '{
      "client_name": "Test MCP Client",
      "redirect_uris": ["http://localhost:3000/oauth/callback"],
      "grant_types": ["authorization_code"],
      "response_types": ["code"],
      "token_endpoint_auth_method": "none"
    }'

2. Ran node api/oauth2_test_server.mjs: consent screen → Authorise → code → token
   exchange
3. Tested Decline → error=access_denied on callback

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3 Skipped Deployments

Project	Deployment	Actions	Updated (UTC)
docs	Ignored	Preview	Apr 6, 2026 0:57am
flagsmith-frontend-preview	Ignored	Preview	Apr 6, 2026 0:57am
flagsmith-frontend-staging	Ignored	Preview	Apr 6, 2026 0:57am

[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-e2e:pr-7124	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-frontend:pr-7124	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-api-test:pr-7124	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith:pr-7124	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-7124	Finished ✅	Results ✅

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.28%. Comparing base (254c215) to head (f02e487).

Additional details and impacted files

@@                             Coverage Diff                              @@
##           feat/implement-dynamic-client-registration    #7124    +/-   ##
============================================================================
  Coverage                                       98.27%   98.28%            
============================================================================
  Files                                            1348     1349     +1     
  Lines                                           50350    50500   +150     
============================================================================
+ Hits                                            49483    49633   +150     
  Misses                                            867      867            

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[github-actions]

Playwright Test Results (oss - depot-ubuntu-latest-16)

 10 passed

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 2 passed

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 2 tests across 2 suites
 1 minute, 5 seconds
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Playwright Test Results (private-cloud - depot-ubuntu-latest-arm-16)

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Playwright Test Results (oss - depot-ubuntu-latest-16)

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Playwright Test Results (oss - depot-ubuntu-latest-arm-16)

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 10 tests across 7 suites
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Playwright Test Results (private-cloud - depot-ubuntu-latest-16)

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Playwright Test Results (private-cloud - depot-ubuntu-latest-arm-16)

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Playwright Test Results (oss - depot-ubuntu-latest-16)

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Playwright Test Results (oss - depot-ubuntu-latest-arm-16)

 10 passed

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 10 tests across 7 suites
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Playwright Test Results (private-cloud - depot-ubuntu-latest-16)

 16 passed

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 16 tests across 13 suites
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Playwright Test Results (private-cloud - depot-ubuntu-latest-arm-16)

 1 passed

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Playwright Test Results (oss - depot-ubuntu-latest-16)

 10 passed

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Playwright Test Results (oss - depot-ubuntu-latest-arm-16)

 10 passed

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 10 tests across 7 suites
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Playwright Test Results (private-cloud - depot-ubuntu-latest-16)

 2 passed

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 2 tests across 2 suites
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Playwright Test Results (private-cloud - depot-ubuntu-latest-arm-16)

 1 passed

Details

 1 test across 1 suite
 1 minute, 9 seconds
 f02e487
 🔄 Run: #15782 (attempt 1)