getsmarter/moodle-api

module Moodle
  module Api
    # Generates tokens using username, password and service
    # Used for accessing Moodle API
    class TokenGenerator
      attr_reader :configuration

      def initialize(configuration)
        @configuration = configuration
      end

      def call
        if raise_token_exception?
          fail ArgumentError,
               'Username and password are required to generate a token'
        end

        generate_token
      end

      private

      def generate_token
        response = Request.new.post(configuration.token_api_url,
                                    params: request_params,
                                    headers: { 'Accept' => 'json' })
        response['token']
      end

      def raise_token_exception?
        configuration.username.nil? || configuration.password.nil?
      end

      def request_params
        {
          username: configuration.username,
          password: configuration.password,
          service: configuration.service
        }
      end
    end
  end
end