UserAuth fixes

[tracyboehrer]

No description provided.

[Copilot]

Pull Request Overview

This PR addresses issues in user authentication flows by enhancing error logging, refining handler name assignment, and adding necessary null checks.

• Logging improvements in SignUserInAsync in UserAuthorizationDispatcher.
• Default assignment for handlerName and corresponding changes in UserAuthorization.
• Configuration fallback for AgentApplicationOptions and an added _userAuth null check in AgentApplication.

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
UserAuthorizationDispatcher.cs	Added trace logging for exceptions in the SignUserInAsync method.
UserAuthorization.cs	Introduced a default assignment for handlerName and updated the dispatcher call to use handlerName directly.
AgentApplicationOptions.cs	Added fallback logic for configuration sections based on the class name.
AgentApplication.cs	Included an extra null check for _userAuth in the route handling logic.

Comments suppressed due to low confidence (3)

src/libraries/Builder/Microsoft.Agents.Builder/App/AgentApplicationOptions.cs:137

• Consider adding a comment to explain the rationale for falling back to the configuration section named after the class to improve future maintainability.

if (!section.Exists()) { ... section = configuration.GetSection(nameof(AgentApplicationOptions)); }

src/libraries/Builder/Microsoft.Agents.Builder/App/UserAuth/UserAuthorization.cs:125

• [nitpick] With the null-coalescing assignment ensuring a default value for handlerName, using handlerName directly in the dispatcher call is safe; please verify that this change fully aligns with the expected behavior in all scenarios.

handlerName ??= DefaultHandlerName;

src/libraries/Builder/Microsoft.Agents.Builder/App/AgentApplication.cs:746

• The added null check for _userAuth helps prevent potential runtime errors; ensure that this change aligns with the intended route selection and sign-in behavior.

if (_userAuth == null || route.AutoSignInHandler == null || route.AutoSignInHandler.Length == 0)