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module API
  # Internal access API
  class Internal < Grape::API
    before { authenticate_by_gitlab_shell_token! }

    helpers ::API::Helpers::InternalHelpers

    namespace 'internal' do
      # Check if git command is allowed to project
      #
      # Params:
      #   key_id - ssh key id for Git over SSH
      #   user_id - user id for Git over HTTP
      #   protocol - Git access protocol being used, e.g. HTTP or SSH
      #   project - project path with namespace
      #   action - git action (git-upload-pack or git-receive-pack)
      #   changes - changes as "oldrev newrev ref", see Gitlab::ChangesList
      post "/allowed" do
        status 200

        # Stores some Git-specific env thread-safely
        Gitlab::Git::Env.set(parse_env)

        actor =
          if params[:key_id]
            Key.find_by(id: params[:key_id])
          elsif params[:user_id]
            User.find_by(id: params[:user_id])
          end

        protocol = params[:protocol]

        actor.update_last_used_at if actor.is_a?(Key)

        access_checker_klass = wiki? ? Gitlab::GitAccessWiki : Gitlab::GitAccess
        access_checker = access_checker_klass
          .new(actor, project, protocol, authentication_abilities: ssh_authentication_abilities)

        begin
          access_checker.check(params[:action], params[:changes])
        rescue Gitlab::GitAccess::UnauthorizedError, Gitlab::GitAccess::NotFoundError => e
          return { status: false, message: e.message }
        end

        log_user_activity(actor)

        {
          status: true,
          gl_repository: gl_repository,
          repository_path: repository_path
        }
      end

      post "/lfs_authenticate" do
        status 200

        key = Key.find(params[:key_id])
        key.update_last_used_at

        token_handler = Gitlab::LfsToken.new(key)

        {
          username: token_handler.actor_name,
          lfs_token: token_handler.token,
          repository_http_path: project.http_url_to_repo
        }
      end

      get "/merge_request_urls" do
        ::MergeRequests::GetUrlsService.new(project).execute(params[:changes])
      end

      #
      # Discover user by ssh key
      #
      get "/discover" do
        key = Key.find(params[:key_id])
        present key.user, with: Entities::UserSafe
      end

      get "/check" do
        {
          api_version: API.version,
          gitlab_version: Gitlab::VERSION,
          gitlab_rev: Gitlab::REVISION
        }
      end

      get "/broadcast_messages" do
        if messages = BroadcastMessage.current
          present messages, with: Entities::BroadcastMessage
        else
          []
        end
      end

      get "/broadcast_message" do
        if message = BroadcastMessage.current.last
          present message, with: Entities::BroadcastMessage
        else
          {}
        end
      end

      post '/two_factor_recovery_codes' do
        status 200

        key = Key.find_by(id: params[:key_id])

        if key
          key.update_last_used_at
        else
          return { 'success' => false, 'message' => 'Could not find the given key' }
        end

        if key.is_a?(DeployKey)
          return { success: false, message: 'Deploy keys cannot be used to retrieve recovery codes' }
        end

        user = key.user

        unless user
          return { success: false, message: 'Could not find a user for the given key' }
        end

        unless user.two_factor_enabled?
          return { success: false, message: 'Two-factor authentication is not enabled for this user' }
        end

        codes = user.generate_otp_backup_codes!
        user.save!

        { success: true, recovery_codes: codes }
      end

      post "/notify_post_receive" do
        status 200

        # TODO: Re-enable when Gitaly is processing the post-receive notification
        # return unless Gitlab::GitalyClient.enabled?
        #
        # begin
        #   repository = wiki? ? project.wiki.repository : project.repository
        #   Gitlab::GitalyClient::Notifications.new(repository.raw_repository).post_receive
        # rescue GRPC::Unavailable => e
        #   render_api_error!(e, 500)
        # end
      end
    end
  end
end