chore: case insensitive email (#29978)

Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>
Co-authored-by: -LAN- <laipz8200@outlook.com>

api/services/account_service.py

@@ -8,7 +8,7 @@ from hashlib import sha256
 from typing import Any, cast
 
 from pydantic import BaseModel
-from sqlalchemy import func
+from sqlalchemy import func, select
 from sqlalchemy.orm import Session
 from werkzeug.exceptions import Unauthorized
 
@@ -748,6 +748,21 @@ class AccountService:
         cls.email_code_login_rate_limiter.increment_rate_limit(email)
         return token
 
+    @staticmethod
+    def get_account_by_email_with_case_fallback(email: str, session: Session | None = None) -> Account | None:
+        """
+        Retrieve an account by email and fall back to the lowercase email if the original lookup fails.
+
+        This keeps backward compatibility for older records that stored uppercase emails while the
+        rest of the system gradually normalizes new inputs.
+        """
+        query_session = session or db.session
+        account = query_session.execute(select(Account).filter_by(email=email)).scalar_one_or_none()
+        if account or email == email.lower():
+            return account
+
+        return query_session.execute(select(Account).filter_by(email=email.lower())).scalar_one_or_none()
+
     @classmethod
     def get_email_code_login_data(cls, token: str) -> dict[str, Any] | None:
         return TokenManager.get_token_data(token, "email_code_login")
@@ -1363,16 +1378,22 @@ class RegisterService:
         if not inviter:
             raise ValueError("Inviter is required")
 
+        normalized_email = email.lower()
+
         """Invite new member"""
         with Session(db.engine) as session:
-            account = session.query(Account).filter_by(email=email).first()
+            account = AccountService.get_account_by_email_with_case_fallback(email, session=session)
 
         if not account:
             TenantService.check_member_permission(tenant, inviter, None, "add")
-            name = email.split("@")[0]
+            name = normalized_email.split("@")[0]
 
             account = cls.register(
-                email=email, name=name, language=language, status=AccountStatus.PENDING, is_setup=True
+                email=normalized_email,
+                name=name,
+                language=language,
+                status=AccountStatus.PENDING,
+                is_setup=True,
             )
             # Create new tenant member for invited tenant
             TenantService.create_tenant_member(tenant, account, role)
@@ -1394,7 +1415,7 @@ class RegisterService:
         # send email
         send_invite_member_mail_task.delay(
             language=language,
-            to=email,
+            to=account.email,
             token=token,
             inviter_name=inviter.name if inviter else "Dify",
             workspace_name=tenant.name,
@@ -1493,6 +1514,16 @@ class RegisterService:
             invitation: dict = json.loads(data)
             return invitation
 
+    @classmethod
+    def get_invitation_with_case_fallback(
+        cls, workspace_id: str | None, email: str | None, token: str
+    ) -> dict[str, Any] | None:
+        invitation = cls.get_invitation_if_token_valid(workspace_id, email, token)
+        if invitation or not email or email == email.lower():
+            return invitation
+        normalized_email = email.lower()
+        return cls.get_invitation_if_token_valid(workspace_id, normalized_email, token)
+
 
 def _generate_refresh_token(length: int = 64):
     token = secrets.token_hex(length)

api/services/webapp_auth_service.py

@@ -12,6 +12,7 @@ from libs.passport import PassportService
 from libs.password import compare_password
 from models import Account, AccountStatus
 from models.model import App, EndUser, Site
+from services.account_service import AccountService
 from services.app_service import AppService
 from services.enterprise.enterprise_service import EnterpriseService
 from services.errors.account import AccountLoginError, AccountNotFoundError, AccountPasswordError
@@ -32,7 +33,7 @@ class WebAppAuthService:
     @staticmethod
     def authenticate(email: str, password: str) -> Account:
         """authenticate account with email and password"""
-        account = db.session.query(Account).filter_by(email=email).first()
+        account = AccountService.get_account_by_email_with_case_fallback(email)
         if not account:
             raise AccountNotFoundError()
 
@@ -52,7 +53,7 @@ class WebAppAuthService:
 
     @classmethod
     def get_user_through_email(cls, email: str):
-        account = db.session.query(Account).where(Account.email == email).first()
+        account = AccountService.get_account_by_email_with_case_fallback(email)
         if not account:
             return None