Adding missing login provider related methods from Flask-Appbuilder (#21294)

(cherry picked from commit 38894e8)

Author: aa3pankaj

airflow/www/fab_security/manager.py

@@ -187,6 +187,7 @@ def __init__(self, appbuilder):
         # Role Mapping
         app.config.setdefault("AUTH_ROLES_MAPPING", {})
         app.config.setdefault("AUTH_ROLES_SYNC_AT_LOGIN", False)
+        app.config.setdefault("AUTH_API_LOGIN_ALLOW_MULTIPLE_PROVIDERS", False)
 
         # LDAP Config
         if self.auth_type == AUTH_LDAP:
@@ -292,11 +293,21 @@ def get_roles_from_keys(self, role_keys: List[str]) -> Set[role_model]:
                         log.warning(f"Can't find role specified in AUTH_ROLES_MAPPING: {fab_role_name}")
         return _roles
 
+    @property
+    def auth_type_provider_name(self):
+        provider_to_auth_type = {AUTH_DB: "db", AUTH_LDAP: "ldap"}
+        return provider_to_auth_type.get(self.auth_type)
+
     @property
     def get_url_for_registeruser(self):
         """Gets the URL for Register User"""
         return url_for(f"{self.registeruser_view.endpoint}.{self.registeruser_view.default_view}")
 
+    @property
+    def get_user_datamodel(self):
+        """Gets the User data model"""
+        return self.user_view.datamodel
+
     @property
     def get_register_user_datamodel(self):
         """Gets the Register User data model"""
@@ -307,6 +318,10 @@ def builtin_roles(self):
         """Get the builtin roles"""
         return self._builtin_roles
 
+    @property
+    def api_login_allow_multiple_providers(self):
+        return self.appbuilder.get_app.config["AUTH_API_LOGIN_ALLOW_MULTIPLE_PROVIDERS"]
+
     @property
     def auth_type(self):
         """Get the auth type"""

setup.cfg

@@ -104,7 +104,12 @@ install_requires =
     #      https://github.com/readthedocs/sphinx_rtd_theme/issues/1115
     docutils<0.17
     flask>=1.1.0, <2.0
-    flask-appbuilder>=3.3.4, <4.0.0
+    # We are tightly coupled with FAB version because we vendored in part of FAB code related to security manager
+    # This is done as part of preparation to removing FAB as dependency, but we are not ready for it yet
+    # Every time we update FAB version here, please make sure that you review the classes and models in
+    # `airflow/www/fab_security` with their upstream counterparts. In particular, make sure any breaking changes,
+    # for example any new methods, are accounted for.
+    flask-appbuilder==3.4.4
     flask-caching>=1.5.0, <2.0.0
     flask-login>=0.3, <0.5
     # Strict upper-bound on the latest release of flask-session,