Add project git hooks api.

lib/api/api.rb

@@ -41,6 +41,7 @@ module API
     mount ProjectMembers
     mount DeployKeys
     mount ProjectHooks
+    mount ProjectGitHooks
     mount Ldap
     mount Services
     mount Files

lib/api/entities.rb

@@ -34,6 +34,11 @@ module API
       expose :issues_events, :merge_requests_events, :tag_push_events
     end
 
+    class ProjectGitHook < Grape::Entity
+      expose :id, :project_id, :created_at
+      expose :commit_message_regex, :deny_delete_tag
+    end
+
     class ForkedFromProject < Grape::Entity
       expose :id
       expose :name, :name_with_namespace

lib/api/project_git_hooks.rb

+module API
+  # Projects git hook API
+  class ProjectGitHooks < Grape::API
+    before { authenticate! }
+    before { authorize_admin_project }
+
+    resource :projects do
+      # Get project git hook
+      #
+      # Parameters:
+      #   id (required) - The ID of a project
+      # Example Request:
+      #   GET /projects/:id/git_hook
+      get ":id/git_hook" do
+        @git_hooks = user_project.git_hook
+        present @git_hooks, with: Entities::ProjectGitHook
+      end
+
+      # Add git hook to project
+      #
+      # Parameters:
+      #   id (required) - The ID of a project
+      # Example Request:
+      #   POST /projects/:id/git_hook
+      post ":id/git_hook" do
+        attrs = attributes_for_keys [
+          :commit_message_regex,
+          :deny_delete_tag
+        ]
+
+        if user_project.git_hook
+          error!("Project git hook exists", 422)
+        else
+          @git_hook = user_project.create_git_hook(attrs)
+          present @git_hook, with: Entities::ProjectGitHook
+        end
+      end
+
+      # Update an existing project git hook
+      #
+      # Parameters:
+      #   id (required) - The ID of a project
+      # Example Request:
+      #   PUT /projects/:id/git_hook
+      put ":id/git_hook" do
+        @git_hook = user_project.git_hook
+
+        attrs = attributes_for_keys [
+          :commit_message_regex,
+          :deny_delete_tag
+        ]
+
+        if @git_hook.update_attributes attrs
+          present @git_hook, with: Entities::ProjectGitHook
+        else
+          not_found!
+        end
+      end
+
+      # Deletes project git hook. This is an idempotent function.
+      #
+      # Parameters:
+      #   id (required) - The ID of a project
+      # Example Request:
+      #   DELETE /projects/:id/git_hook
+      delete ":id/git_hook" do
+        @git_hook = user_project.git_hook
+        if @git_hook
+          @git_hook.destroy
+        else
+          not_found!
+        end
+      end
+    end
+  end
+end