Add basic Release data to GraphQL endpoint

This commit adds basic Release data to our GraphQL endpoint.

app/finders/releases_finder.rb

 # frozen_string_literal: true
 
 class ReleasesFinder
-  def initialize(project, current_user = nil)
+  attr_reader :project, :current_user, :params
+
+  def initialize(project, current_user = nil, params = {})
     @project = project
     @current_user = current_user
+    @params = params
   end
 
   def execute(preload: true)
-    return Release.none unless Ability.allowed?(@current_user, :read_release, @project)
+    return Release.none unless Ability.allowed?(current_user, :read_release, project)
 
     # See https://gitlab.com/gitlab-org/gitlab/-/issues/211988
-    releases = @project.releases.where.not(tag: nil) # rubocop:disable CodeReuse/ActiveRecord
+    releases = project.releases.where.not(tag: nil) # rubocop:disable CodeReuse/ActiveRecord
+    releases = by_tag(releases)
     releases = releases.preloaded if preload
     releases.sorted
   end
+
+  private
+
+  # rubocop: disable CodeReuse/ActiveRecord
+  def by_tag(releases)
+    return releases unless params[:tag].present?
+
+    releases.where(tag: params[:tag])
+  end
+  # rubocop: enable CodeReuse/ActiveRecord
 end

app/graphql/resolvers/release_resolver.rb

+# frozen_string_literal: true
+
+module Resolvers
+  class ReleaseResolver < BaseResolver
+    type Types::ReleaseType, null: true
+
+    argument :tag_name, GraphQL::STRING_TYPE,
+            required: true,
+            description: 'The name of the tag associated to the release'
+
+    alias_method :project, :object
+
+    def self.single
+      self
+    end
+
+    def resolve(tag_name:)
+      ReleasesFinder.new(
+        project,
+        current_user,
+        { tag: tag_name }
+      ).execute.first
+    end
+  end
+end

app/graphql/resolvers/releases_resolver.rb

+# frozen_string_literal: true
+
+module Resolvers
+  class ReleasesResolver < BaseResolver
+    type Types::ReleaseType.connection_type, null: true
+
+    alias_method :project, :object
+
+    # This resolver has a custom singular resolver
+    def self.single
+      Resolvers::ReleaseResolver
+    end
+
+    def resolve(**args)
+      ReleasesFinder.new(
+        project,
+        current_user
+      ).execute
+    end
+  end
+end

app/graphql/types/project_type.rb

@@ -217,6 +217,20 @@ module Types
           null: true,
           description: 'A single Alert Management alert of the project',
           resolver: Resolvers::AlertManagementAlertResolver.single
+
+    field :releases,
+          Types::ReleaseType.connection_type,
+          null: true,
+          description: 'Releases of the project',
+          resolver: Resolvers::ReleasesResolver,
+          feature_flag: :graphql_release_data
+
+    field :release,
+          Types::ReleaseType,
+          null: true,
+          description: 'A single release of the project',
+          resolver: Resolvers::ReleasesResolver.single,
+          feature_flag: :graphql_release_data
   end
 end
 

app/graphql/types/release_type.rb

+# frozen_string_literal: true
+
+module Types
+  class ReleaseType < BaseObject
+    graphql_name 'Release'
+
+    authorize :read_release
+
+    alias_method :release, :object
+
+    present_using ReleasePresenter
+
+    field :tag_name, GraphQL::STRING_TYPE, null: false, method: :tag,
+          description: 'Name of the tag associated with the release'
+    field :tag_path, GraphQL::STRING_TYPE, null: true,
+          description: 'Relative web path to the tag associated with the release'
+    field :description, GraphQL::STRING_TYPE, null: true,
+          description: 'Description (also known as "release notes") of the release'
+    markdown_field :description_html, null: true
+    field :name, GraphQL::STRING_TYPE, null: true,
+          description: 'Name of the release'
+    field :evidence_sha, GraphQL::STRING_TYPE, null: true,
+          description: "SHA of the release's evidence"
+    field :created_at, Types::TimeType, null: true,
+          description: 'Timestamp of when the release was created'
+    field :released_at, Types::TimeType, null: true,
+          description: 'Timestamp of when the release was released'
+    field :milestones, Types::MilestoneType.connection_type, null: true,
+          description: 'Milestones associated to the release'
+
+    field :author, Types::UserType, null: true,
+          description: 'User that created the release'
+
+    def author
+      Gitlab::Graphql::Loaders::BatchModelLoader.new(User, release.author_id).find
+    end
+
+    field :commit, Types::CommitType, null: true,
+          complexity: 10, calls_gitaly: true,
+          description: 'The commit associated with the release',
+          authorize: :reporter_access
+
+    def commit
+      return if release.sha.nil?
+
+      release.project.commit_by(oid: release.sha)
+    end
+  end
+end

doc/api/graphql/reference/gitlab_schema.graphql

@@ -7265,6 +7265,41 @@ type Project {
   """
   publicJobs: Boolean
 
+  """
+  A single release of the project. Available only when feature flag `graphql_release_data` is enabled
+  """
+  release(
+    """
+    The name of the tag associated to the release
+    """
+    tagName: String!
+  ): Release
+
+  """
+  Releases of the project. Available only when feature flag `graphql_release_data` is enabled
+  """
+  releases(
+    """
+    Returns the elements in the list that come after the specified cursor.
+    """
+    after: String
+
+    """
+    Returns the elements in the list that come before the specified cursor.
+    """
+    before: String
+
+    """
+    Returns the first _n_ elements from the list.
+    """
+    first: Int
+
+    """
+    Returns the last _n_ elements from the list.
+    """
+    last: Int
+  ): ReleaseConnection
+
   """
   Indicates if `Delete source branch` option should be enabled by default for all new merge requests of the project
   """
@@ -8032,6 +8067,118 @@ enum RegistryState {
   SYNCED
 }
 
+type Release {
+  """
+  User that created the release
+  """
+  author: User
+
+  """
+  The commit associated with the release
+  """
+  commit: Commit
+
+  """
+  Timestamp of when the release was created
+  """
+  createdAt: Time
+
+  """
+  Description (also known as "release notes") of the release
+  """
+  description: String
+
+  """
+  The GitLab Flavored Markdown rendering of `description`
+  """
+  descriptionHtml: String
+
+  """
+  SHA of the release's evidence
+  """
+  evidenceSha: String
+
+  """
+  Milestones associated to the release
+  """
+  milestones(
+    """
+    Returns the elements in the list that come after the specified cursor.
+    """
+    after: String
+
+    """
+    Returns the elements in the list that come before the specified cursor.
+    """
+    before: String
+
+    """
+    Returns the first _n_ elements from the list.
+    """
+    first: Int
+
+    """
+    Returns the last _n_ elements from the list.
+    """
+    last: Int
+  ): MilestoneConnection
+
+  """
+  Name of the release
+  """
+  name: String
+
+  """
+  Timestamp of when the release was released
+  """
+  releasedAt: Time
+
+  """
+  Name of the tag associated with the release
+  """
+  tagName: String!
+
+  """
+  Relative web path to the tag associated with the release
+  """
+  tagPath: String
+}
+
+"""
+The connection type for Release.
+"""
+type ReleaseConnection {
+  """
+  A list of edges.
+  """
+  edges: [ReleaseEdge]
+
+  """
+  A list of nodes.
+  """
+  nodes: [Release]
+
+  """
+  Information to aid in pagination.
+  """
+  pageInfo: PageInfo!
+}
+
+"""
+An edge in a connection.
+"""
+type ReleaseEdge {
+  """
+  A cursor for use in pagination.
+  """
+  cursor: String!
+
+  """
+  The item at the end of the edge.
+  """
+  node: Release
+}
+
 """
 Autogenerated input type of RemoveAwardEmoji
 """

doc/api/graphql/reference/index.md

@@ -1073,6 +1073,7 @@ Information about pagination in a connection.
 | `path` | String! | Path of the project |
 | `printingMergeRequestLinkEnabled` | Boolean | Indicates if a link to create or view a merge request should display after a push to Git repositories of the project from the command line |
 | `publicJobs` | Boolean | Indicates if there is public access to pipelines and job details of the project, including output logs and artifacts |
+| `release` | Release | A single release of the project. Available only when feature flag `graphql_release_data` is enabled |
 | `removeSourceBranchAfterMerge` | Boolean | Indicates if `Delete source branch` option should be enabled by default for all new merge requests of the project |
 | `repository` | Repository | Git repository of the project |
 | `requestAccessEnabled` | Boolean | Indicates if users can request member access to the project |
@@ -1154,6 +1155,21 @@ Information about pagination in a connection.
 | `storageSize` | Float! | Storage size of the project |
 | `wikiSize` | Float | Wiki size of the project |
 
+## Release
+
+| Name  | Type  | Description |
+| ---   |  ---- | ----------  |
+| `author` | User | User that created the release |
+| `commit` | Commit | The commit associated with the release |
+| `createdAt` | Time | Timestamp of when the release was created |
+| `description` | String | Description (also known as "release notes") of the release |
+| `descriptionHtml` | String | The GitLab Flavored Markdown rendering of `description` |
+| `evidenceSha` | String | SHA of the release's evidence |
+| `name` | String | Name of the release |
+| `releasedAt` | Time | Timestamp of when the release was released |
+| `tagName` | String! | Name of the tag associated with the release |
+| `tagPath` | String | Relative web path to the tag associated with the release |
+
 ## RemoveAwardEmojiPayload
 
 Autogenerated return type of RemoveAwardEmoji

spec/finders/releases_finder_spec.rb

@@ -5,10 +5,11 @@ require 'spec_helper'
 describe ReleasesFinder do
   let(:user)       { create(:user) }
   let(:project)    { create(:project, :repository) }
+  let(:params)     { {} }
   let(:repository) { project.repository }
   let(:v1_0_0)     { create(:release, project: project, tag: 'v1.0.0') }
   let(:v1_1_0)     { create(:release, project: project, tag: 'v1.1.0') }
-  let(:finder) { described_class.new(project, user) }
+  let(:finder) { described_class.new(project, user, params) }
 
   before do
     v1_0_0.update_attribute(:released_at, 2.days.ago)
@@ -64,6 +65,14 @@ describe ReleasesFinder do
           expect(subject).to eq([v1_1_0])
         end
       end
+
+      context 'when a tag parameter is passed' do
+        let(:params) { { tag: 'v1.0.0' } }
+
+        it 'only returns the release with the matching tag' do
+          expect(subject).to eq([v1_0_0])
+        end
+      end
     end
   end
 end

spec/graphql/resolvers/release_resolver_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe Resolvers::ReleaseResolver do
+  include GraphqlHelpers
+
+  let_it_be(:project) { create(:project, :private) }
+  let_it_be(:release) { create(:release, project: project) }
+  let_it_be(:developer) { create(:user) }
+  let_it_be(:public_user) { create(:user) }
+
+  let(:args) { { tag_name: release.tag } }
+
+  before do
+    project.add_developer(developer)
+  end
+
+  describe '#resolve' do
+    context 'when the user does not have access to the project' do
+      let(:current_user) { public_user }
+
+      it 'returns nil' do
+        expect(resolve_release).to be_nil
+      end
+    end
+
+    context "when the user has full access to the project's releases" do
+      let(:current_user) { developer }
+
+      it 'returns the release associated with the specified tag' do
+        expect(resolve_release).to eq(release)
+      end
+
+      context 'when no tag_name argument was passed' do
+        let(:args) { {} }
+
+        it 'raises an error' do
+          expect { resolve_release }.to raise_error(ArgumentError, "missing keyword: tag_name")
+        end
+      end
+    end
+  end
+
+  private
+
+  def resolve_release
+    context = { current_user: current_user }
+    resolve(described_class, obj: project, args: args, ctx: context)
+  end
+end

spec/graphql/resolvers/releases_resolver_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe Resolvers::ReleasesResolver do
+  include GraphqlHelpers
+
+  let_it_be(:project) { create(:project, :private) }
+  let_it_be(:release_v1) { create(:release, project: project, tag: 'v1.0.0') }
+  let_it_be(:release_v2) { create(:release, project: project, tag: 'v2.0.0') }
+  let_it_be(:developer) { create(:user) }
+  let_it_be(:public_user) { create(:user) }
+
+  before do
+    project.add_developer(developer)
+  end
+
+  describe '#resolve' do
+    context 'when the user does not have access to the project' do
+      let(:current_user) { public_user }
+
+      it 'returns an empty array' do
+        expect(resolve_releases).to eq([])
+      end
+    end
+
+    context "when the user has full access to the project's releases" do
+      let(:current_user) { developer }
+
+      it 'returns all releases associated to the project' do
+        expect(resolve_releases).to eq([release_v1, release_v2])
+      end
+    end
+  end
+
+  private
+
+  def resolve_releases
+    context = { current_user: current_user }
+    resolve(described_class, obj: project, args: {}, ctx: context)
+  end
+end

spec/graphql/types/project_type_spec.rb

@@ -24,7 +24,7 @@ describe GitlabSchema.types['Project'] do
       namespace group statistics repository merge_requests merge_request issues
       issue pipelines removeSourceBranchAfterMerge sentryDetailedError snippets
       grafanaIntegration autocloseReferencedIssues suggestion_commit_message environments
-      boards jira_import_status jira_imports services
+      boards jira_import_status jira_imports services releases release
     ]
 
     expect(described_class).to include_graphql_fields(*expected_fields)
@@ -96,4 +96,18 @@ describe GitlabSchema.types['Project'] do
 
     it { is_expected.to have_graphql_type(Types::Projects::ServiceType.connection_type) }
   end
+
+  describe 'releases field' do
+    subject { described_class.fields['release'] }
+
+    it { is_expected.to have_graphql_type(Types::ReleaseType) }
+    it { is_expected.to have_graphql_resolver(Resolvers::ReleaseResolver) }
+  end
+
+  describe 'release field' do
+    subject { described_class.fields['releases'] }
+
+    it { is_expected.to have_graphql_type(Types::ReleaseType.connection_type) }
+    it { is_expected.to have_graphql_resolver(Resolvers::ReleasesResolver) }
+  end
 end

spec/graphql/types/release_type_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe GitlabSchema.types['Release'] do
+  it { expect(described_class).to require_graphql_authorizations(:read_release) }
+
+  it 'has the expected fields' do
+    expected_fields = %w[
+      tag_name tag_path
+      description description_html
+      name evidence_sha milestones author commit
+      created_at released_at
+    ]
+
+    expect(described_class).to include_graphql_fields(*expected_fields)
+  end
+
+  describe 'milestones field' do
+    subject { described_class.fields['milestones'] }
+
+    it { is_expected.to have_graphql_type(Types::MilestoneType.connection_type) }
+  end
+
+  describe 'author field' do
+    subject { described_class.fields['author'] }
+
+    it { is_expected.to have_graphql_type(Types::UserType) }
+  end
+
+  describe 'commit field' do
+    subject { described_class.fields['commit'] }
+
+    it { is_expected.to have_graphql_type(Types::CommitType) }
+    it { is_expected.to require_graphql_authorizations(:reporter_access) }
+  end
+end