fix(apps): allow sign-in handlers to override default routes

[RaghunandanKumar]

Fixes #159

Summary

Mirrors the default-route override behavior from microsoft/teams.ts#317 for the Python apps router.

Today App registers the built-in signin.token-exchange and signin.verify-state handlers the same way user handlers are registered. If an app later calls on_signin_token_exchange(...) or on_signin_verify_state(...), the custom handler is appended instead of replacing the built-in default, so both routes remain active.

This change introduces route metadata in ActivityRouter, registers the built-in OAuth handlers as system routes, and passes route_name through generated handler registrations. When a user handler is registered for the same named route, the matching system default is removed so the app-level override becomes the only handler for that route.

Changes

• packages/apps/src/microsoft_teams/apps/routing/router.py
  • Track route name/type metadata instead of storing bare (selector, handler) tuples.
  • Remove matching system routes when a user route with the same route_name is registered.
• packages/apps/src/microsoft_teams/apps/app.py
  • Register built-in sign-in token exchange and verify-state handlers directly as system routes.
• packages/apps/scripts/generate_handlers.py
  • Carry config.name into generated add_handler(...) calls.
• packages/apps/src/microsoft_teams/apps/routing/generated_handlers.py
  • Regenerated to pass route_name=config.name for decorator-based registrations.
• packages/apps/tests/test_app_oauth.py
  • Add regression proving a user signin.token-exchange handler replaces the system default in the middleware chain.
• packages/apps/tests/test_app.py
  • Add app-level regression proving App.on_signin_token_exchange(...) leaves only the custom handler selected for signin/tokenExchange.

Test plan

• .venv/bin/ruff format packages/apps/src/microsoft_teams/apps/app.py packages/apps/src/microsoft_teams/apps/routing/router.py packages/apps/src/microsoft_teams/apps/routing/generated_handlers.py packages/apps/scripts/generate_handlers.py packages/apps/tests/test_app.py packages/apps/tests/test_app_oauth.py
• .venv/bin/ruff check packages/apps/src/microsoft_teams/apps/app.py packages/apps/src/microsoft_teams/apps/routing/router.py packages/apps/src/microsoft_teams/apps/routing/generated_handlers.py packages/apps/scripts/generate_handlers.py packages/apps/tests/test_app.py packages/apps/tests/test_app_oauth.py
• PYTHONPATH=packages/api/src:packages/apps/src:packages/common/src:packages/cards/src:packages/botbuilder/src:packages/graph/src .venv/bin/python -m pytest packages/apps/tests/test_app.py packages/apps/tests/test_app_oauth.py -q
• Reviewer eyeball: confirm the new system vs user route terminology matches the intended public direction for broader route override support.

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[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

This PR introduces a routing concept that allows developer-registered handlers to replace built-in (system) OAuth routes (notably sign-in token exchange / verify-state), and adds tests to ensure override behavior.

Changes:

• Add route metadata (route_name, route_type) to the router and implement “user overrides system default” behavior.
• Register OAuth sign-in system handlers directly on the router as route_type="system".
• Update generated handler registration to pass route_name, and add tests validating override semantics.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
packages/apps/src/microsoft_teams/apps/routing/router.py	Adds RouteEntry + route metadata and implements logic to drop system routes when a user handler with the same name is registered.
packages/apps/src/microsoft_teams/apps/app.py	Registers the OAuth sign-in defaults as explicit “system” routes (so user handlers can replace them).
packages/apps/src/microsoft_teams/apps/routing/generated_handlers.py	Ensures all generated on_* registrations include a route_name for consistent routing/override behavior.
packages/apps/scripts/generate_handlers.py	Updates the generator template so future generated handlers pass route_name.
packages/apps/tests/test_app_oauth.py	Adds an async test validating that a developer sign-in token exchange handler replaces the system default.
packages/apps/tests/test_app.py	Adds a test that registering on_signin_token_exchange replaces the default route; also modifies nearby assertions.

Comments suppressed due to low confidence (1)

packages/apps/tests/test_app.py:1

• The assertion that validates activity_events[0].body.type == core_activity.type appears to have been removed (there’s now a blank line before the next test). This weakens the existing test by no longer verifying that the event preserves the activity type; please restore the assertion.

"""