go-garminconnect/COMPLETION_NOTES.md

Go Garmin Connect API Implementation - Completion Report

Completed Phases

Phase 1: Setup & Core Structure

• Go module initialized
• Project structure created
• Docker infrastructure with multi-stage builds
• CI/CD pipeline setup
• Initial documentation added

Phase 2: Authentication System

• OAuth2 authentication with MFA support implemented
• Token storage with file-based system
• MFA handling support
• Authentication tests

Phase 3: API Client Core

• Client struct defined
• Request/response handling
• Logging implementation
• Rate limiting

Phase 4: Endpoint Implementation

• User profile endpoint
• Activities endpoint with pagination
• Response validation

Phase 5: FIT Handling

• Basic FIT decoder implementation
• Streaming FIT encoder implementation
  • io.WriteSeeker interface
  • Incremental CRC calculation
  • Memory efficient for large files

How to Run the Application

1. Set environment variables:

export GARMIN_CONSUMER_KEY=your_key
export GARMIN_CONSUMER_SECRET=your_secret

2. Build and run with Docker:

cd docker
docker compose up -d --build

3. Access the application at: http://localhost:8080

Activity Endpoints Implementation Details

• Implemented GetActivities with pagination support
• Created GetActivityDetails endpoint
• Added custom JSON unmarshalling for activity data
• Implemented robust error handling for 404 responses
• Added GPS track point timestamp parsing
• Created comprehensive table-driven tests
  • Custom time parsing with garminTime structure
  • Mock server implementation
  • Test coverage for 200/404 responses

Activity Upload/Download Implementation

• Implemented UploadActivity endpoint
  • Handles multipart FIT file uploads
  • Validates FIT file structure
  • Returns created activity ID
• Implemented DownloadActivity endpoint
  • Retrieves activity as FIT binary
  • Sets proper content headers
• Added FIT file validation
• Created comprehensive tests for upload/download flow

Gear Management Implementation Details

• Implemented GetGearStats endpoint
  • Retrieves detailed statistics for a gear item
  • Handles 404 responses for invalid UUIDs
• Implemented GetGearActivities endpoint
  • Supports pagination (start, limit parameters)
  • Returns activity details with proper time formatting
• Added comprehensive table-driven tests
  • Mock server implementations
  • Test coverage for success and error cases
  • Pagination verification

MFA Session Management

• Implemented state persistence for MFA flow
• Created MFA state storage interface
• Added file-based implementation for MFA state
• Integrated with authentication flow
• Added comprehensive tests for session persistence

Next Steps

• Add comprehensive test coverage for all endpoints
• Improve error handling and logging