datacite/spinone

class ApplicationController < ActionController::API
  # include base controller methods
  include Authenticable

  attr_accessor :current_user

  before_action :default_format_json, :transform_params
  after_action :set_jsonp_format, :set_consumer_header

  # from https://github.com/spree/spree/blob/master/api/app/controllers/spree/api/base_controller.rb
  def set_jsonp_format
    if params[:callback] && request.get?
      self.response_body = "#{params[:callback]}(#{response.body})"
      headers["Content-Type"] = 'application/javascript'
    end
  end

  def set_consumer_header
    if current_user
      response.headers['X-Credential-Username'] = current_user.uid
    else
      response.headers['X-Anonymous-Consumer'] = true
    end
  end

  # convert parameters with hyphen to parameters with underscore.
  # deep_transform_keys has been removed in Rails 5.1
  # https://stackoverflow.com/questions/35812277/fields-parameters-with-hyphen-in-ruby-on-rails
  def transform_params
    params.transform_keys! { |key| key.tr('-', '_') }
  end

  def default_format_json
    request.format = :json if request.format.html?
  end

  def authenticate_user_from_token!
    token = token_from_request_headers
    return false unless token.present?

    @current_user = User.new(token)
  end

  def current_ability
    @current_ability ||= Ability.new(current_user)
  end

  # from https://github.com/nsarno/knock/blob/master/lib/knock/authenticable.rb
  def token_from_request_headers
    unless request.headers['Authorization'].nil?
      request.headers['Authorization'].split.last
    end
  end

  unless Rails.env.development?
    rescue_from *RESCUABLE_EXCEPTIONS do |exception|
      status = case exception.class.to_s
               when "CanCan::AccessDenied", "JWT::DecodeError" then 401
               when "AbstractController::ActionNotFound", "ActionController::RoutingError" then 404
               when "ActiveModel::ForbiddenAttributesError", "ActionController::UnpermittedParameters", "NoMethodError" then 422
               else 400
               end

      if status == 404
        message = "The resource you are looking for doesn't exist."
      elsif status == 401
        message = "You are not authorized to access this resource."
      else
        Raven.capture_exception(exception)
        
        message = exception.message
      end

      render json: { errors: [{ status: status.to_s, title: message }] }.to_json, status: status
    end
  end

  protected

  def is_admin_or_staff?
    current_user && current_user.is_admin_or_staff? ? 1 : 0
  end
end