Merge branch 'grapify-tags' into 'master'

Grapify tags API

## What does this MR do?

Add the Grape-DSL to the tags API.

## Are there points in the code the reviewer needs to double check?

The delete endpoint only has a description but no success entity because we don't have one. We only return the branch name as JSON. Should I do something else?

## What are the relevant issue numbers?

Related to #22928

See merge request !6860

lib/api/tags.rb

@@ -4,25 +4,24 @@ module API
     before { authenticate! }
     before { authorize! :download_code, user_project }
 
+    params do
+      requires :id, type: String, desc: 'The ID of a project'
+    end
     resource :projects do
-      # Get a project repository tags
-      #
-      # Parameters:
-      #   id (required) - The ID of a project
-      # Example Request:
-      #   GET /projects/:id/repository/tags
+      desc 'Get a project repository tags' do
+        success Entities::RepoTag
+      end
       get ":id/repository/tags" do
         present user_project.repository.tags.sort_by(&:name).reverse,
                 with: Entities::RepoTag, project: user_project
       end
 
-      # Get a single repository tag
-      #
-      # Parameters:
-      #   id (required)       - The ID of a project
-      #   tag_name (required) - The name of the tag
-      # Example Request:
-      #   GET /projects/:id/repository/tags/:tag_name
+      desc 'Get a single repository tag' do
+        success Entities::RepoTag
+      end
+      params do
+        requires :tag_name, type: String, desc: 'The name of the tag'
+      end
       get ":id/repository/tags/:tag_name", requirements: { tag_name: /.+/ } do
         tag = user_project.repository.find_tag(params[:tag_name])
         not_found!('Tag') unless tag
@@ -30,20 +29,21 @@ module API
         present tag, with: Entities::RepoTag, project: user_project
       end
 
-      # Create tag
-      #
-      # Parameters:
-      #   id (required) - The ID of a project
-      #   tag_name (required) - The name of the tag
-      #   ref (required) - Create tag from commit sha or branch
-      #   message (optional) - Specifying a message creates an annotated tag.
-      # Example Request:
-      #   POST /projects/:id/repository/tags
+      desc 'Create a new repository tag' do
+        success Entities::RepoTag
+      end
+      params do
+        requires :tag_name,            type: String, desc: 'The name of the tag'
+        requires :ref,                 type: String, desc: 'The commit sha or branch name'
+        optional :message,             type: String, desc: 'Specifying a message creates an annotated tag'
+        optional :release_description, type: String, desc: 'Specifying release notes stored in the GitLab database'
+      end
       post ':id/repository/tags' do
         authorize_push_project
-        message = params[:message] || nil
+        create_params = declared(params)
+
         result = CreateTagService.new(user_project, current_user).
-          execute(params[:tag_name], params[:ref], message, params[:release_description])
+          execute(create_params[:tag_name], create_params[:ref], create_params[:message], create_params[:release_description])
 
         if result[:status] == :success
           present result[:tag],
@@ -54,15 +54,13 @@ module API
         end
       end
 
-      # Delete tag
-      #
-      # Parameters:
-      #   id (required) - The ID of a project
-      #   tag_name (required) - The name of the tag
-      # Example Request:
-      #   DELETE /projects/:id/repository/tags/:tag
+      desc 'Delete a repository tag'
+      params do
+        requires :tag_name, type: String, desc: 'The name of the tag'
+      end
       delete ":id/repository/tags/:tag_name", requirements: { tag_name: /.+/ } do
         authorize_push_project
+
         result = DeleteTagService.new(user_project, current_user).
           execute(params[:tag_name])
 
@@ -75,17 +73,16 @@ module API
         end
       end
 
-      # Add release notes to tag
-      #
-      # Parameters:
-      #   id (required) - The ID of a project
-      #   tag_name (required) - The name of the tag
-      #   description (required) - Release notes with markdown support
-      # Example Request:
-      #   POST /projects/:id/repository/tags/:tag_name/release
+      desc 'Add a release note to a tag' do
+        success Entities::Release
+      end
+      params do
+        requires :tag_name,    type: String, desc: 'The name of the tag'
+        requires :description, type: String, desc: 'Release notes with markdown support'
+      end
       post ':id/repository/tags/:tag_name/release', requirements: { tag_name: /.+/ } do
         authorize_push_project
-        required_attributes! [:description]
+
         result = CreateReleaseService.new(user_project, current_user).
           execute(params[:tag_name], params[:description])
 
@@ -96,17 +93,16 @@ module API
         end
       end
 
-      # Updates a release notes of a tag
-      #
-      # Parameters:
-      #   id (required) - The ID of a project
-      #   tag_name (required) - The name of the tag
-      #   description (required) - Release notes with markdown support
-      # Example Request:
-      #   PUT /projects/:id/repository/tags/:tag_name/release
+      desc "Update a tag's release note" do
+        success Entities::Release
+      end
+      params do
+        requires :tag_name,    type: String, desc: 'The name of the tag'
+        requires :description, type: String, desc: 'Release notes with markdown support'
+      end
       put ':id/repository/tags/:tag_name/release', requirements: { tag_name: /.+/ } do
         authorize_push_project
-        required_attributes! [:description]
+
         result = UpdateReleaseService.new(user_project, current_user).
           execute(params[:tag_name], params[:description])