Added repository files to GraphQL API

app/graphql/resolvers/tree_resolver.rb

+# frozen_string_literal: true
+
+module Resolvers
+  class TreeResolver < BaseResolver
+    argument :path, GraphQL::STRING_TYPE,
+              required: false,
+              default_value: '',
+              description: 'The path to get the tree for. Default value is the root of the repository'
+    argument :ref, GraphQL::STRING_TYPE,
+              required: false,
+              default_value: :head,
+              description: 'The commit ref to get the tree for. Default value is HEAD'
+    argument :recursive, GraphQL::BOOLEAN_TYPE,
+              required: false,
+              default_value: false,
+              description: 'Used to get a recursive tree. Default is false'
+
+    alias_method :repository, :object
+
+    def resolve(**args)
+      return unless repository.exists?
+
+      repository.tree(args[:ref], args[:path], recursive: args[:recursive])
+    end
+  end
+end

app/graphql/types/project_type.rb

@@ -69,6 +69,8 @@ module Types
     field :namespace, Types::NamespaceType, null: false
     field :group, Types::GroupType, null: true
+    field :repository, Types::RepositoryType, null: false
+
     field :merge_requests,
           Types::MergeRequestType.connection_type,
           null: true,

app/graphql/types/repository_type.rb

+# frozen_string_literal: true
+
+module Types
+  class RepositoryType < BaseObject
+    graphql_name 'Repository'
+
+    authorize :download_code
+
+    field :root_ref, GraphQL::STRING_TYPE, null: true
+    field :empty, GraphQL::BOOLEAN_TYPE, null: false, method: :empty?
+    field :exists, GraphQL::BOOLEAN_TYPE, null: false, method: :exists?
+    field :tree, Types::Tree::TreeType, null: true, resolver: Resolvers::TreeResolver
+  end
+end

app/graphql/types/tree/blob_type.rb

+# frozen_string_literal: true
+module Types
+  module Tree
+    class BlobType < BaseObject
+      implements Types::Tree::EntryType
+
+      graphql_name 'Blob'
+    end
+  end
+end

app/graphql/types/tree/entry_type.rb

+# frozen_string_literal: true
+module Types
+  module Tree
+    module EntryType
+      include Types::BaseInterface
+
+      field :id, GraphQL::ID_TYPE, null: false
+      field :name, GraphQL::STRING_TYPE, null: false
+      field :type, Tree::TypeEnum, null: false
+      field :path, GraphQL::STRING_TYPE, null: false
+      field :flat_path, GraphQL::STRING_TYPE, null: false
+    end
+  end
+end

app/graphql/types/tree/submodule_type.rb

+# frozen_string_literal: true
+module Types
+  module Tree
+    class SubmoduleType < BaseObject
+      implements Types::Tree::EntryType
+
+      graphql_name 'Submodule'
+    end
+  end
+end

app/graphql/types/tree/tree_entry_type.rb

+# frozen_string_literal: true
+module Types
+  module Tree
+    class TreeEntryType < BaseObject
+      implements Types::Tree::EntryType
+
+      graphql_name 'TreeEntry'
+      description 'Represents a directory'
+    end
+  end
+end

app/graphql/types/tree/tree_type.rb

+# frozen_string_literal: true
+module Types
+  module Tree
+    class TreeType < BaseObject
+      graphql_name 'Tree'
+
+      field :trees, Types::Tree::TreeEntryType.connection_type, null: false
+      field :submodules, Types::Tree::SubmoduleType.connection_type, null: false
+      field :blobs, Types::Tree::BlobType.connection_type, null: false
+    end
+  end
+end

app/graphql/types/tree/type_enum.rb

+# frozen_string_literal: true
+
+module Types
+  module Tree
+    class TypeEnum < BaseEnum
+      graphql_name 'EntryType'
+      description 'Type of a tree entry'
+
+      value 'tree', value: :tree
+      value 'blob', value: :blob
+      value 'commit', value: :commit
+    end
+  end
+end

spec/graphql/resolvers/tree_resolver_spec.rb

+require 'spec_helper'
+
+describe Resolvers::TreeResolver do
+  include GraphqlHelpers
+
+  let(:repository) { create(:project, :repository).repository }
+
+  describe '#resolve' do
+    it 'resolves to a tree' do
+      result = resolve_repository({ ref: "master" })
+
+      expect(result).to be_an_instance_of(Tree)
+    end
+
+    it 'resolve to a recursive tree' do
+      result = resolve_repository({ ref: "master", recursive: true })
+
+      expect(result.trees[4].path).to eq('files/html')
+    end
+
+    context 'when repository does not exist' do
+      it 'returns nil' do
+        allow(repository).to receive(:exists?).and_return(false)
+
+        result = resolve_repository({ ref: "master" })
+
+        expect(result).to be(nil)
+      end
+    end
+  end
+
+  def resolve_repository(args)
+    resolve(described_class, obj: repository, args: args)
+  end
+end

spec/graphql/types/project_type_spec.rb

@@ -17,4 +17,6 @@ describe GitlabSchema.types['Project'] do
   end
   it { is_expected.to have_graphql_field(:pipelines) }
+
+  it { is_expected.to have_graphql_field(:repository) }
 end

spec/graphql/types/repository_type_spec.rb

+require 'spec_helper'
+
+describe GitlabSchema.types['Repository'] do
+  it { expect(described_class.graphql_name).to eq('Repository') }
+
+  it { expect(described_class).to require_graphql_authorizations(:download_code) }
+
+  it { is_expected.to have_graphql_field(:root_ref) }
+
+  it { is_expected.to have_graphql_field(:tree) }
+end

spec/graphql/types/tree/blob_type_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe Types::Tree::BlobType do
+  it { expect(described_class.graphql_name).to eq('Blob') }
+
+  it { expect(described_class).to have_graphql_fields(:id, :name, :type, :path, :flat_path) }
+end

spec/graphql/types/tree/submodule_type_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe Types::Tree::SubmoduleType do
+  it { expect(described_class.graphql_name).to eq('Submodule') }
+
+  it { expect(described_class).to have_graphql_fields(:id, :name, :type, :path, :flat_path) }
+end

spec/graphql/types/tree/tree_entry_type_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe Types::Tree::TreeEntryType do
+  it { expect(described_class.graphql_name).to eq('TreeEntry') }
+
+  it { expect(described_class).to have_graphql_fields(:id, :name, :type, :path, :flat_path) }
+end

spec/graphql/types/tree/tree_type_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe Types::Tree::TreeType do
+  it { expect(described_class.graphql_name).to eq('Tree') }
+
+  it { expect(described_class).to have_graphql_fields(:trees, :submodules, :blobs) }
+end

spec/graphql/types/tree/type_enum_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe Types::Tree::TypeEnum do
+  it { expect(described_class.graphql_name).to eq('EntryType') }
+
+  it 'exposes all tree entry types' do
+    expect(described_class.values.keys).to include(*%w[tree blob commit])
+  end
+end

spec/requests/api/graphql/project/repository_spec.rb

+# frozen_string_literal: true
+require 'spec_helper'
+
+describe 'getting a repository in a project' do
+  include GraphqlHelpers
+
+  let(:project) { create(:project, :repository) }
+  let(:current_user) { project.owner }
+  let(:fields) do
+    <<~QUERY
+      #{all_graphql_fields_for('repository'.classify)}
+    QUERY
+  end
+  let(:query) do
+    graphql_query_for(
+      'project',
+      { 'fullPath' => project.full_path },
+      query_graphql_field('repository', {}, fields)
+    )
+  end
+
+  it 'returns repository' do
+    post_graphql(query, current_user: current_user)
+
+    expect(graphql_data['project']['repository']).to be_present
+  end
+
+  context 'as a non-authorized user' do
+    let(:current_user) { create(:user) }
+
+    it 'returns nil' do
+      post_graphql(query, current_user: current_user)
+
+      expect(graphql_data['project']).to be(nil)
+    end
+  end
+end

spec/requests/api/graphql/project/tree/tree_spec.rb

+# frozen_string_literal: true
+require 'spec_helper'
+
+describe 'getting a tree in a project' do
+  include GraphqlHelpers
+
+  let(:project) { create(:project, :repository) }
+  let(:current_user) { project.owner }
+  let(:path) { "" }
+  let(:ref) { "master" }
+  let(:fields) do
+    <<~QUERY
+      tree(path:"#{path}", ref:"#{ref}") {
+        #{all_graphql_fields_for('tree'.classify)}
+      }
+    QUERY
+  end
+  let(:query) do
+    graphql_query_for(
+      'project',
+      { 'fullPath' => project.full_path },
+      query_graphql_field('repository', {}, fields)
+    )
+  end
+
+  context 'when path does not exist' do
+    let(:path) { "testing123" }
+
+    it 'returns empty tree' do
+      post_graphql(query, current_user: current_user)
+
+      expect(graphql_data['project']['repository']['tree']['trees']['edges']).to eq([])
+      expect(graphql_data['project']['repository']['tree']['submodules']['edges']).to eq([])
+      expect(graphql_data['project']['repository']['tree']['blobs']['edges']).to eq([])
+    end
+  end
+
+  context 'when ref does not exist' do
+    let(:ref) { "testing123" }
+
+    it 'returns empty tree' do
+      post_graphql(query, current_user: current_user)
+
+      expect(graphql_data['project']['repository']['tree']['trees']['edges']).to eq([])
+      expect(graphql_data['project']['repository']['tree']['submodules']['edges']).to eq([])
+      expect(graphql_data['project']['repository']['tree']['blobs']['edges']).to eq([])
+    end
+  end
+
+  context 'when ref and path exist' do
+    it 'returns tree' do
+      post_graphql(query, current_user: current_user)
+
+      expect(graphql_data['project']['repository']['tree']).to be_present
+    end
+
+    it 'returns blobs, subtrees and submodules inside tree' do
+      post_graphql(query, current_user: current_user)
+
+      expect(graphql_data['project']['repository']['tree']['trees']['edges'].size).to be > 0
+      expect(graphql_data['project']['repository']['tree']['blobs']['edges'].size).to be > 0
+      expect(graphql_data['project']['repository']['tree']['submodules']['edges'].size).to be > 0
+    end
+  end
+
+  context 'when current user is nil' do
+    it 'returns empty project' do
+      post_graphql(query, current_user: nil)
+
+      expect(graphql_data['project']).to be(nil)
+    end
+  end
+end