Refactor git http controllers to rely on auth results differently

Auth results can return an ambiguous actor, either user or
deploy token. Refactor to explicitly get user or deploy token
rather than accessing the actor directly.

app/controllers/repositories/git_http_client_controller.rb

@@ -8,12 +8,9 @@ class GitHttpClientController < Repositories::ApplicationController
 
     attr_reader :authentication_result, :redirected_path
 
-    delegate :actor, :authentication_abilities, to: :authentication_result, allow_nil: true
+    delegate :authentication_abilities, to: :authentication_result, allow_nil: true
     delegate :type, to: :authentication_result, allow_nil: true, prefix: :auth_result
 
-    alias_method :user, :actor
-    alias_method :authenticated_user, :actor
-
     # Git clients will not know what authenticity token to send along
     skip_around_action :set_session_storage
     skip_before_action :verify_authenticity_token
@@ -22,8 +19,16 @@ class GitHttpClientController < Repositories::ApplicationController
 
     feature_category :source_code_management
 
+    def authenticated_user
+      authentication_result&.user || authentication_result&.deploy_token
+    end
+
     private
 
+    def user
+      authenticated_user
+    end
+
     def download_request?
       raise NotImplementedError
     end

ee/app/controllers/ee/repositories/git_http_controller.rb

@@ -30,6 +30,7 @@ def git_receive_pack
 
       private
 
+      override :user
       def user
         super || geo_push_user&.user
       end

spec/controllers/repositories/git_http_controller_spec.rb

@@ -90,6 +90,14 @@ def send_request
         end
       end
     end
+
+    context 'when the user is a deploy token' do
+      it_behaves_like Repositories::GitHttpController do
+        let(:container) { project }
+        let(:user) { create(:deploy_token, :project, projects: [project]) }
+        let(:access_checker_class) { Gitlab::GitAccess }
+      end
+    end
   end
 
   context 'when repository container is a project wiki' do

spec/support/shared_examples/controllers/repositories/git_http_controller_shared_examples.rb

@@ -50,7 +50,8 @@
 
     context 'with authorized user' do
       before do
-        request.headers.merge! auth_env(user.username, user.password, nil)
+        password = user.try(:password) || user.try(:token)
+        request.headers.merge! auth_env(user.username, password, nil)
       end
 
       it 'returns 200' do
@@ -71,9 +72,10 @@
         it 'adds user info to the logs' do
           get :info_refs, params: params
 
-          expect(log_data).to include('username' => user.username,
-                                      'user_id' => user.id,
-                                      'meta.user' => user.username)
+          user_log_data = { 'username' => user.username, 'user_id' => user.id }
+          user_log_data['meta.user'] = user.username if user.is_a?(User)
+
+          expect(log_data).to include(user_log_data)
         end
       end
     end