Initiate OAuth flow for Google Earth Engine authentication.

Authentication: JWT token required Authorization: Any authenticated user

Prerequisites:

• Server must have Google OAuth client credentials configured
• Environment variables GOOGLE_OAUTH_CLIENT_ID and GOOGLE_OAUTH_CLIENT_SECRET required

Response Schema:

{
  "data": {
    "auth_url": "https://accounts.google.com/o/oauth2/auth?...",
    "state": "random-state-string-for-csrf-protection"
  }
}

Response Fields:

• auth_url: URL to redirect user to for Google OAuth authorization
• state: CSRF protection token to include in callback

OAuth Flow Steps:

1. Call this endpoint to get authorization URL
2. Redirect user to the auth_url
3. User authorizes your application in Google
4. User is redirected back with authorization code
5. Call /user/me/gee-oauth/callback with the code and state

Error Responses:

• 401 Unauthorized: JWT token required or invalid
• 500 Internal Server Error: OAuth not configured or server error