lib/api/avatar.rb


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module API
  class Avatar < Grape::API
    resource :avatar do
      desc 'Return avatar url for a user' do
        success Entities::Avatar
      end
      params do
        requires :email, type: String, desc: 'Public email address of the user'
        optional :size, type: Integer, desc: 'Single pixel dimension for Gravatar images'
      end
      get do
        forbidden!('Unauthorized access') unless can?(current_user, :read_users_list)

        user = User.find_by_public_email(params[:email])
        user ||= User.new(email: params[:email])

        present user, with: Entities::Avatar, size: params[:size]
      end
    end
  end
end