Initial Switch to V2. Completely Overhauled Backend, Frontend and General Structure.

backend/users/service.py

@@ -2,8 +2,9 @@ from datetime import datetime
 
 from google.cloud.firestore_v1 import DocumentReference
 
+from firebase_admin import auth as firebase_auth
 from shared.firebase import get_db, get_bucket
-from shared.exceptions import NotFoundError
+from shared.exceptions import NotFoundError, ValidationError
 from users.models import UserCreate, UserUpdate, UserInDB
 
 COLLECTION = "users"
@@ -252,6 +253,31 @@ def get_user_devices(user_doc_id: str) -> list[dict]:
     return devices
 
 
+def set_password(user_doc_id: str, new_password: str) -> None:
+    """Set a Firebase Auth password for a user via their Firestore document ID.
+
+    Requires the user document to have a non-empty `uid` field — populated
+    automatically for users who registered via the Flutter app.
+    """
+    if not new_password or len(new_password) < 6:
+        raise ValidationError("Password must be at least 6 characters.")
+
+    db = get_db()
+    doc_ref = db.collection(COLLECTION).document(user_doc_id)
+    doc = doc_ref.get()
+    if not doc.exists:
+        raise NotFoundError("User")
+
+    uid = doc.to_dict().get("uid", "")
+    if not uid:
+        raise ValidationError("This user has no Firebase Auth UID — they may not have signed up via the app yet.")
+
+    try:
+        firebase_auth.update_user(uid, password=new_password)
+    except Exception as e:
+        raise RuntimeError(f"Firebase Auth error: {e}")
+
+
 def upload_photo(user_doc_id: str, file_bytes: bytes, filename: str, content_type: str) -> str:
     """Upload a profile photo to Firebase Storage and update the user's photo_url."""
     db = get_db()