Allow changing username

frontend/api.py

@@ -208,7 +208,7 @@ def api_add_user(inputs: Dict[str, str]):
 def api_manage_user(inputs: Dict[str, Any]):
     user = api_key_map[g.hashed_api_key].user_data
     if request.method == 'PUT':
-        user.update(None, inputs['new_password'])
+        user.update(inputs['new_username'], inputs['new_password'])
         return return_api({})
 
     elif request.method == 'DELETE':
@@ -581,7 +581,7 @@ def api_admin_users(inputs: Dict[str, Any]):
 def api_admin_user(inputs: Dict[str, Any], u_id: int):
     user = users.get_one(u_id)
     if request.method == 'PUT':
-        user.update(None, inputs['new_password'])
+        user.update(inputs['new_username'], inputs['new_password'])
         return return_api({})
 
     elif request.method == 'DELETE':

frontend/input_validation.py

@@ -137,10 +137,16 @@ class CreateUsernameVariable(UsernameVariable):
     ]
 
 
-class NewPasswordVariable(InputVariable):
+class NewUsernameVariable(NonRequiredInputVariable):
+    name = "new_username"
+    description = "The new username of the user account"
+    related_exceptions = [InvalidKeyValue, UsernameInvalid, UsernameTaken]
+
+
+class NewPasswordVariable(NonRequiredInputVariable):
     name = "new_password"
     description = "The new password of the user account"
-    related_exceptions = [KeyNotFound]
+    related_exceptions = [InvalidKeyValue]
 
 
 class TitleVariable(InputVariable):
@@ -470,7 +476,7 @@ class UsersData(EndpointData):
     methods = Methods(
         put=(
             "Change the password of the user account",
-            [NewPasswordVariable]
+            [NewUsernameVariable, NewPasswordVariable]
         ),
         delete=(
             "Delete the user account",
@@ -732,7 +738,7 @@ class UserManagementData(EndpointData):
     methods = Methods(
         put=(
             "Change the password of the user account",
-            [NewPasswordVariable]
+            [NewUsernameVariable, NewPasswordVariable]
         ),
         delete=(
             "Delete the user account",