Backend fix login

Fixes issue #1 (closed)

Summary of changes

• UserAccount entity type added to datastore
• User's email address is checked against the database and user entity with the user's assigned roles is added to the session instead of the google account
• Created custom error AuthenticationError and moved all custom errors to a single module
• Added better exception handling and logging to the login process

api/services/datastore.py

@@ -162,27 +162,26 @@ def _get_datastore_client(default_namespace: bool = False):
     stored in the environment variable 'DEPLOYMENT_ENVIRONMENT" or defalut if the
     variable is unset"""
 
-    # # If running in app engine
-    # if os.getenv('GAE_ENV', '').startswith('standard'):
-    #     if default_namespace:
-    #         client = datastore.Client(namespace=None)
-    #         logging.info(f"Instantiating datastore client with default namespace")
-    #     else:
-    #         namespace=os.getenv('GAE_SERVICE')
-    #         client = datastore.Client(namespace=namespace)
-    #         logging.info(f"Instantiating datastore client with namespace: {namespace}")
-    # else:
-    #     # If running on local machine or testing environment
-    #     os.environ["DATASTORE_PROJECT_ID"] = "emulated-project"
-
-    #     from google.auth.credentials import AnonymousCredentials
-
-    #     client = datastore.Client(
-    #         project="emulated-project",
-    #         namespace='ns_test',
-    #         credentials=None
-    #     )
-    client = datastore.Client()
+    # If running in app engine
+    if os.getenv('GAE_ENV', '').startswith('standard'):
+        if default_namespace:
+            client = datastore.Client(namespace=None)
+            logging.info(f"Instantiating datastore client with default namespace")
+        else:
+            namespace=os.getenv('GAE_SERVICE')
+            client = datastore.Client(namespace=namespace)
+            logging.info(f"Instantiating datastore client with namespace: {namespace}")
+    else:
+        # If running on local machine or testing environment
+        os.environ["DATASTORE_PROJECT_ID"] = "emulated-project"
+
+        from google.auth.credentials import AnonymousCredentials
+
+        client = datastore.Client(
+            project="emulated-project",
+            namespace='ns_test',
+            credentials=None
+        )
     return client