Fix ConfigureAwait(false) deadlock issue in BaseBearerTokenAuthenticationProvider

[Copilot]

The AuthenticateRequestAsync method in BaseBearerTokenAuthenticationProvider.cs was missing .ConfigureAwait(false) on its await call, which can cause deadlocks in legacy (.NET Framework) applications when used with synchronous blocking calls.

Problem

When using Microsoft.Graph (which uses Kiota) in non-async contexts with patterns like:

graphClient.Users["email"].SendMail
    .PostAsync(requestBody)
    .ConfigureAwait(false)
    .GetAwaiter()
    .GetResult();

The authentication provider's AuthenticateRequestAsync method would deadlock because it wasn't using ConfigureAwait(false) internally.

Solution

Added .ConfigureAwait(false) to the await call in BaseBearerTokenAuthenticationProvider.cs:

// Before
var token = await AccessTokenProvider.GetAuthorizationTokenAsync(request.URI, additionalAuthenticationContext, cancellationToken);

// After  
var token = await AccessTokenProvider.GetAuthorizationTokenAsync(request.URI, additionalAuthenticationContext, cancellationToken).ConfigureAwait(false);

This change follows the existing pattern used throughout the Kiota codebase and prevents deadlocks when the authentication provider is used in synchronous contexts.

Testing

• Added a new test BaseBearerTokenAuthenticationProviderUsesConfigureAwaitFalse to validate the fix
• All existing authentication tests continue to pass
• Verified no other similar issues exist in the authentication provider files

Fixes #554.

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud