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sstent
eebedaa57c
- Created detailed implementation plan with technical context - Developed data models for GarthToken, MFAChallenge, and UserSession entities - Defined API contracts for MFA authentication flow - Created quickstart guide for implementation - Updated agent context with new technology stack - Verified constitution compliance for all design decisions
33 lines
2.8 KiB
Markdown
33 lines
2.8 KiB
Markdown
# Research Findings: Update Authentication Flow for MFA with garth
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## Phase 0: Outline & Research
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### Decision
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Update the GarminSync authentication flow to properly handle Multi-Factor Authentication (MFA) by integrating with garth's built-in MFA capabilities. The implementation will follow garth's authentication patterns as observed in the reference implementation while ensuring compatibility with the existing GarminSync service architecture.
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### Rationale
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- The current implementation doesn't properly handle Garmin's MFA flow, causing authentication to fail for users with MFA enabled
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- garth library has built-in support for Garmin's MFA challenges, but needs to be properly integrated into the API endpoints
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- The existing architecture separates CLI from authentication logic (CLI ↔ Backend Service ↔ garth ↔ Garmin), which needs to properly relay MFA challenges back to the user
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- garth token management needs to be securely stored in CentralDB instead of local files for service-based architecture
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### Technology Choices Made
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- **garth Library**: Continue using garth as it's specifically designed for Garmin authentication and handles MFA flows properly
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- **Token Storage**: Use CentralDB for storing garth tokens with proper security (encrypted storage)
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- **MFA Flow**: Implement multi-step authentication where initial request triggers MFA, then a second request completes with MFA code
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- **API Design**: Create proper API endpoints to handle the multi-step MFA authentication flow
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- **CLI Integration**: Update CLI to handle multi-step authentication flow with appropriate user prompts
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### Key Implementation Insights
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1. garth's `login()` function can handle MFA internally when run in an interactive context, but in a service context, MFA challenges need to be handled differently
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2. The service needs to implement a two-phase authentication approach: first request to initiate, second request with MFA code to complete
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3. garth tokens (OAuth1 and OAuth2) need to be securely extracted and stored after successful authentication
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4. Token refresh mechanisms should be implemented to handle token expiration automatically
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### Alternatives Considered
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- **Direct garth integration in CLI**: Would simplify MFA flow but would break the service-oriented architecture
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- **Custom MFA handling**: Would require more complex implementation than leveraging garth's built-in support
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- **Storing tokens in filesystem**: Less secure than CentralDB storage which allows for proper access controls
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### Integration Approach
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The solution will modify the existing authentication endpoints to support a multi-step MFA flow while maintaining compatibility with the existing API contract. The backend service will use garth to initiate authentication, detect MFA requirements, and allow completion of authentication when provided with the MFA code. |