auth für user

app/auth/account.py

@@ -0,0 +1,36 @@
+from sqlalchemy.orm import Session
+
+from app.auth.admin import password_matches
+from app.db.models import SyncUser
+from app.db.repositories import UserRepository
+from app.security.credentials import CredentialCipher
+
+
+def authenticate_self_service(
+    session: Session, cipher: CredentialCipher, email: str, password: str
+) -> SyncUser | None:
+    """Matches submitted email/password against any user's stored MyWhoosh OR
+    Garmin credentials -- decrypted and compared locally rather than
+    verified against the live MyWhoosh/Garmin APIs, so logging into this app
+    never opens a redundant upstream session (which, for MyWhoosh, would
+    itself trigger the "already logged in from another device" conflict)."""
+    submitted_email = email.strip()
+    if not submitted_email or not password:
+        return None
+    for user in UserRepository(session).list_all():
+        if _credential_matches(cipher, user.mywhoosh_email_enc, user.mywhoosh_password_enc, submitted_email, password):
+            return user
+        if _credential_matches(cipher, user.garmin_email_enc, user.garmin_password_enc, submitted_email, password):
+            return user
+    return None
+
+
+def _credential_matches(
+    cipher: CredentialCipher, email_enc: str, password_enc: str, submitted_email: str, submitted_password: str
+) -> bool:
+    try:
+        stored_email = cipher.decrypt(email_enc)
+        stored_password = cipher.decrypt(password_enc)
+    except ValueError:
+        return False
+    return stored_email == submitted_email and password_matches(submitted_password, stored_password)