Handle access token expiration and refresh #81
Description
Summary
Implement automatic handling of access token expiration by using the OAuth refresh token to obtain new access tokens without requiring user re-authentication.
Requirements
- Detect when access tokens have expired
- Automatically attempt refresh using stored refresh token
- Handle refresh token expiration gracefully
- Maintain application functionality during token refresh
- Fallback to full re-authentication if refresh fails
Investigation Needed
- Research current token storage and management in webex-rust crate
- Understand Webex API token expiration behavior and error responses
- Determine best approach for detecting token expiration (proactive vs reactive)
- Plan integration with existing authentication flow
Implementation Considerations
- May require modifications to webex-rust crate (../vendor/webex-rust)
- Need to handle token refresh without disrupting ongoing operations
- Consider thread safety for token updates across multiple API calls
- Plan for graceful degradation when refresh tokens are invalid/expired
Acceptance Criteria
- Access token expiration is automatically detected
- Refresh tokens are used to obtain new access tokens
- Application continues functioning seamlessly during token refresh
- Users are prompted for re-authentication only when refresh fails
- Token refresh works across all API operations
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