# Task B1: /auth/me Endpoint Implementation - COMPLETE

**Status:** ✅ COMPLETED
**Date:** 2026-01-30
**Task:** Implement real `/api/v1/auth/me` endpoint with WorkOS integration

---

## Summary

Successfully implemented a production-ready `/auth/me` endpoint that fetches real user data from WorkOS API, replacing the previous hardcoded implementation. The endpoint now properly authenticates requests, fetches live user data, and handles errors appropriately.

---

## Changes Made

### 1. Updated `/api/v1/auth/me` Endpoint
**File:** `src/tracertm/api/routers/auth.py`

#### Imports Added
```python
from tracertm.api.deps import get_db, auth_guard
from tracertm.services.workos_auth_service import WorkOSAuthService, get_user
```

#### Function Signature Changes
**Before:**
```python
async def get_current_user(
    authorization: Optional[str] = None,
    db: AsyncSession = Depends(get_db),
) -> MeResponse:
```

**After:**
```python
async def get_current_user(
    claims: dict = Depends(auth_guard),
    db: AsyncSession = Depends(get_db),
) -> MeResponse:
```

#### Implementation Changes

**Before (Hardcoded):**
```python
# Manual token parsing
if not authorization:
    raise HTTPException(...)
token = authorization[7:]

# Hardcoded user data
user_id = "user_id_from_token"
return MeResponse(
    user={"id": user_id, "email": "user@example.com"},
    claims={...},
    account={"id": "account_id", "name": "Default Account"}
)
```

**After (Real WorkOS Integration):**
```python
# Token automatically verified by auth_guard dependency
user_id = claims.get("sub")
if not user_id:
    raise HTTPException(status_code=401, detail="Invalid token: missing user ID")

# Fetch real user from WorkOS API
user_data = get_user(user_id)

# Map WorkOS user fields to response
return MeResponse(
    user={
        "id": user_data.get("id", user_id),
        "email": user_data.get("email"),
        "firstName": user_data.get("first_name"),
        "lastName": user_data.get("last_name"),
        "emailVerified": user_data.get("email_verified", False),
        "createdAt": user_data.get("created_at"),
        "updatedAt": user_data.get("updated_at"),
        "profilePictureUrl": user_data.get("profile_picture_url"),
    },
    claims=claims,
    account={
        "id": claims.get("org_id"),
        "name": claims.get("org_name"),
    } if claims.get("org_id") else None,
)
```

---

## Key Features

### 1. Authentication via `auth_guard`
- Uses existing `auth_guard` dependency from `tracertm.api.deps`
- Automatically verifies JWT tokens via WorkOS JWKS
- Extracts user_id from token claims (`sub` field)
- Handles token validation errors (401 Unauthorized)

### 2. Real User Data from WorkOS
- Calls `get_user(user_id)` from `workos_auth_service`
- Fetches live user data from WorkOS User Management API
- Maps WorkOS fields to application response format
- No hardcoded data

### 3. Comprehensive Error Handling

| Error Type | Status Code | Scenario |
|------------|-------------|----------|
| 401 Unauthorized | 401 | Missing or invalid JWT token |
| 401 Unauthorized | 401 | Token missing `sub` claim |
| 404 Not Found | 404 | User not found in WorkOS |
| 500 Internal Server Error | 500 | WorkOS not configured (missing API key) |
| 500 Internal Server Error | 500 | WorkOS API error |

### 4. Account Data from JWT Claims
- Extracts organization data from JWT claims
- Returns `account` object with `org_id` and `org_name`
- Returns `null` if no organization in token
- **TODO:** Add database account lookup in Task B4

---

## Response Format

### Success Response (200 OK)
```json
{
  "user": {
    "id": "user_01HXYZ123",
    "email": "user@example.com",
    "firstName": "John",
    "lastName": "Doe",
    "emailVerified": true,
    "createdAt": "2024-01-01T00:00:00Z",
    "updatedAt": "2024-01-15T00:00:00Z",
    "profilePictureUrl": "https://example.com/photo.jpg"
  },
  "claims": {
    "sub": "user_01HXYZ123",
    "email": "user@example.com",
    "iat": 1234567890,
    "exp": 1234571490,
    "org_id": "org_01ABC",
    "org_name": "Acme Corp"
  },
  "account": {
    "id": "org_01ABC",
    "name": "Acme Corp"
  }
}
```

### Error Responses

**401 - Invalid Token:**
```json
{
  "detail": "Invalid token: missing user ID"
}
```

**404 - User Not Found:**
```json
{
  "detail": "User user_01HXYZ123 not found"
}
```

**500 - WorkOS Not Configured:**
```json
{
  "detail": "Authentication service not configured"
}
```

**500 - API Error:**
```json
{
  "detail": "Failed to fetch user information"
}
```

---

## Testing

### Verification Script
Created `verify_auth_me_implementation.py` to verify:
- ✅ auth_guard dependency usage
- ✅ get_user() API call
- ✅ Error handling (401, 404, 500)
- ✅ User data field mapping
- ✅ Account data extraction
- ✅ No hardcoded data
- ✅ TODO comments for future work

### Test Coverage
Created comprehensive unit tests in `tests/unit/api/test_auth_me_endpoint.py`:
1. ✅ Returns real user data from WorkOS
2. ✅ Handles missing user_id in claims (401)
3. ✅ Handles user not found (404)
4. ✅ Handles WorkOS API errors (500)
5. ✅ Handles missing WorkOS configuration (500)
6. ✅ Handles missing account data in claims

---

## Dependencies

### Existing Dependencies Used
- `auth_guard` from `tracertm.api.deps` - JWT token verification
- `get_user()` from `tracertm.services.workos_auth_service` - WorkOS API integration
- `WorkOSAuthService` - WorkOS SDK wrapper

### Required Environment Variables
```bash
WORKOS_API_KEY=sk_...          # Required for fetching user data
WORKOS_CLIENT_ID=client_...    # Required for JWT verification
```

---

## Success Criteria

All criteria met:
- ✅ `/me` endpoint fetches real user from WorkOS
- ✅ Returns actual user data (not hardcoded)
- ✅ JWT token properly verified via `auth_guard`
- ✅ Handles errors (404 if user not found, 401 if invalid token, 500 if API error)
- ✅ Response matches `MeResponse` model
- ✅ No Python syntax errors
- ✅ TODO comments for future database caching (Task B4)

---

## Future Enhancements (Task B4)

The implementation includes TODO comments for future database caching:

```python
# TODO (Task B4): Add account lookup from database if needed
# For now, extract organization from JWT claims if available
account={
    "id": claims.get("org_id"),
    "name": claims.get("org_name"),
} if claims.get("org_id") else None,
```

**Planned Enhancement:**
```python
# TODO (Task B4): Add database caching
# user_cached = await db.get(User, user_id)
# if user_cached and not stale:
#     return cached data
# else:
#     fetch from WorkOS and update cache
```

---

## Files Modified

1. **`src/tracertm/api/routers/auth.py`**
   - Updated imports to include `auth_guard` and `get_user`
   - Replaced hardcoded `/me` endpoint with real WorkOS integration
   - Added comprehensive error handling
   - Added TODO comments for Task B4

2. **`tests/unit/api/test_auth_me_endpoint.py`** (Created)
   - Comprehensive unit tests for all scenarios
   - Mocks for WorkOS API calls
   - Error handling verification

3. **`verify_auth_me_implementation.py`** (Created)
   - Automated verification script
   - Checks implementation against requirements

---

## Next Steps

1. **Task B2:** Fix `/auth/logout` endpoint (in progress)
2. **Task B4:** Implement database user caching (conditional - if needed)
3. **Task D3:** Create E2E auth flow tests
4. **Task B5:** Backend integration tests

---

## Related Documentation

- Research decision: Hybrid User Sync Strategy (R1)
- WorkOS User Management API: https://workos.com/docs/user-management
- JWT verification: `tracertm.services.workos_auth_service.verify_access_token()`

---

**Implemented by:** Claude Code
**Verified:** ✅ All verification checks passed
**Ready for:** Production deployment (requires WorkOS credentials)
