Added LDAP authentication support. Fixes #2186

web/pgadmin/authenticate/registry.py

@@ -0,0 +1,65 @@
+##########################################################################
+#
+# pgAdmin 4 - PostgreSQL Tools
+#
+# Copyright (C) 2013 - 2020, The pgAdmin Development Team
+# This software is released under the PostgreSQL Licence
+#
+##########################################################################
+
+"""External Authentication Registry."""
+
+
+from flask_babelex import gettext
+from abc import ABCMeta
+
+
+def _decorate_cls_name(module_name):
+    length = len(__package__) + 1
+
+    if len(module_name) > length and module_name.startswith(__package__):
+        return module_name[length:]
+
+    return module_name
+
+
+class AuthSourceRegistry(ABCMeta):
+    registry = None
+    auth_sources = dict()
+
+    def __init__(cls, name, bases, d):
+
+        # Register this type of auth_sources, based on the module name
+        # Avoid registering the BaseAuthentication itself
+
+        AuthSourceRegistry.registry[_decorate_cls_name(d['__module__'])] = cls
+        ABCMeta.__init__(cls, name, bases, d)
+
+    @classmethod
+    def create(cls, name, **kwargs):
+
+        if name in AuthSourceRegistry.auth_sources:
+            return AuthSourceRegistry.auth_sources[name]
+
+        if name in AuthSourceRegistry.registry:
+            AuthSourceRegistry.auth_sources[name] = \
+                (AuthSourceRegistry.registry[name])(**kwargs)
+            return AuthSourceRegistry.auth_sources[name]
+
+        raise NotImplementedError(
+            gettext(
+                "Authentication source '{0}' has not been implemented."
+            ).format(name)
+        )
+
+    @classmethod
+    def load_auth_sources(cls):
+        # Initialize the registry only if it has not yet been initialized
+        if AuthSourceRegistry.registry is None:
+            AuthSourceRegistry.registry = dict()
+
+        from importlib import import_module
+        from werkzeug.utils import find_modules
+
+        for module_name in find_modules(__package__, True):
+            module = import_module(module_name)