Don't default the module name to "unnamed" on a direct modulemd submission

The module name should either be set in the modulemd file or provided
by the `module_name` parameter.

module_build_service/utils/submit.py

@@ -473,7 +473,12 @@ def submit_module_build_from_yaml(username, handle, params, stream=None, skiptes
     yaml_file = to_text_type(handle.read())
     mmd = load_mmd(yaml_file)
     dt = datetime.utcfromtimestamp(int(time.time()))
-    def_name = str(os.path.splitext(os.path.basename(handle.filename))[0])
+    if hasattr(handle, 'filename'):
+        def_name = str(os.path.splitext(os.path.basename(handle.filename))[0])
+    elif not mmd.get_name():
+        raise ValidationError(
+            "The module's name was not present in the modulemd file. Please use the "
+            "\"module_name\" parameter")
     def_version = int(dt.strftime("%Y%m%d%H%M%S"))
     mmd.set_name(mmd.get_name() or def_name)
     mmd.set_stream(stream or mmd.get_stream() or "master")

module_build_service/views.py

@@ -436,10 +436,8 @@ class YAMLFileHandler(BaseHandler):
     def post(self):
         if "modulemd" in self.data:
             handle = BytesIO(self.data["modulemd"].encode("utf-8"))
-            if "module_name" in self.data and self.data["module_name"]:
+            if self.data.get("module_name"):
                 handle.filename = self.data["module_name"]
-            else:
-                handle.filename = "unnamed"
         else:
             handle = request.files["yaml"]
         return submit_module_build_from_yaml(self.username, handle, self.data)

tests/test_views/test_views.py

@@ -1843,6 +1843,35 @@ class TestViews:
         assert module.buildrequires[0].context == '00000000'
         assert module.buildrequires[0].stream_version == 280000
 
+    @patch('module_build_service.auth.get_user', return_value=user)
+    @patch('module_build_service.config.Config.modules_allow_scratch',
+           new_callable=PropertyMock, return_value=True)
+    @patch('module_build_service.config.Config.yaml_submit_allowed',
+           new_callable=PropertyMock, return_value=True)
+    def test_submit_scratch_build_with_mmd_no_module_name(
+            self, mocked_allow_yaml, mocked_allow_scratch, mocked_get_user):
+        base_dir = path.abspath(path.dirname(__file__))
+        mmd_path = path.join(base_dir, '..', 'staged_data', 'testmodule.yaml')
+        post_url = '/module-build-service/1/module-builds/'
+        with open(mmd_path, 'rb') as f:
+            modulemd = f.read().decode('utf-8')
+
+        post_data = {
+            'branch': 'master',
+            'scratch': True,
+            'modulemd': modulemd,
+        }
+        rv = self.client.post(post_url, data=json.dumps(post_data))
+        assert rv.status_code == 400
+        data = json.loads(rv.data)
+        expected_error = {
+            'error': 'Bad Request',
+            'message': ('The module\'s name was not present in the modulemd file. Please use the '
+                        '"module_name" parameter'),
+            'status': 400
+        }
+        assert data == expected_error
+
     @pytest.mark.parametrize('api_version', [1, 2])
     @patch('module_build_service.auth.get_user', return_value=user)
     @patch('module_build_service.config.Config.modules_allow_scratch',