discourse-subscriptions/app/controllers/discourse_donations/charges_controller.rb

module DiscourseDonations
  class ChargesController < ::ApplicationController
    skip_before_action :verify_authenticity_token, only: [:create]

    before_action :ensure_logged_in, only: [:cancel_subscription]
    before_action :set_user, only: [:index, :create]
    before_action :set_email, only: [:index, :create, :cancel_subscription]

    def index
      result = {}

      if current_user
        stripe = DiscourseDonations::Stripe.new(secret_key, stripe_options)

        list_result = stripe.list(current_user, email: current_user.email)

        result = list_result if list_result.present?
      end

      render json: success_json.merge(result)
    end

    def create
      Rails.logger.info user_params.inspect

      output = { 'messages' => [], 'rewards' => [] }

      if create_account
        if !@email.present? || !user_params[:username].present?
          output['messages'] << I18n.t('login.missing_user_field')
        end
        if user_params[:password] && user_params[:password].length > User.max_password_length
          output['messages'] << I18n.t('login.password_too_long')
        end
        if user_params[:username] && ::User.reserved_username?(user_params[:username])
          output['messages'] << I18n.t('login.reserved_username')
        end
      end

      if output['messages'].present?
        render(json: output.merge(success: false)) && (return)
      end

      Rails.logger.debug "Creating a Stripe payment"
      stripe = DiscourseDonations::Stripe.new(secret_key, stripe_options)
      result = {}

      begin
        Rails.logger.debug "Creating a Stripe charge for #{user_params[:amount]}"
        opts = {
          cause: user_params[:cause],
          email: @email,
          token: user_params[:stripeToken],
          amount: user_params[:amount]
        }

        if user_params[:type] === 'once'
          result[:charge] = stripe.charge(@user, opts)
        else
          opts[:type] = user_params[:type]

          subscription = stripe.subscribe(@user, opts)

          if subscription && subscription['id']
            invoices = stripe.invoices_for_subscription(@user,
              email: opts[:email],
              subscription_id: subscription['id']
            )
          end

          result[:subscription] = {}
          result[:subscription][:subscription] = subscription if subscription
          result[:subscription][:invoices] = invoices if invoices
        end

      rescue ::Stripe::CardError => e
        err = e.json_body[:error]

        output['messages'] << "There was an error (#{err[:type]})."
        output['messages'] << "Error code: #{err[:code]}" if err[:code]
        output['messages'] << "Decline code: #{err[:decline_code]}" if err[:decline_code]
        output['messages'] << "Message: #{err[:message]}" if err[:message]

        render(json: output) && (return)
      end

      if (result[:charge] && result[:charge]['paid'] == true) ||
         (result[:subscription] && result[:subscription][:subscription] &&
          result[:subscription][:subscription]['status'] === 'active')

        output['messages'] << I18n.t('donations.payment.success')

        if (result[:charge] && result[:charge]['receipt_number']) ||
           (result[:subscription] && result[:subscription][:invoices].first['receipt_number'])
          output['messages'] << " #{I18n.t('donations.payment.receipt_sent', email: @email)}"
        end

        output['charge'] = result[:charge] if result[:charge]
        output['subscription'] = result[:subscription] if result[:subscription]

        output['rewards'] << { type: :group, name: group_name } if group_name
        output['rewards'] << { type: :badge, name: badge_name } if badge_name

        if create_account && @email.present?
          args = user_params.to_h.slice(:email, :username, :password, :name).merge(rewards: output['rewards'])
          Jobs.enqueue(:donation_user, args)
        end

        if SiteSetting.discourse_donations_cause_category
          Jobs.enqueue(:update_category_donation_statistics)
        end
      end

      render json: output
    end

    def cancel_subscription
      params.require(:subscription_id)

      stripe = DiscourseDonations::Stripe.new(secret_key, stripe_options)

      result = stripe.cancel_subscription(params[:subscription_id])

      if result[:success]
        render json: success_json.merge(subscription: result[:subscription])
      else
        render json: failed_json.merge(message: result[:message])
      end
    end

    private

    def create_account
      user_params[:create_account] == 'true' && SiteSetting.discourse_donations_enable_create_accounts
    end

    def reward?(payment)
      payment.present? && payment.successful?
    end

    def group_name
      SiteSetting.discourse_donations_reward_group_name
    end

    def badge_name
      SiteSetting.discourse_donations_reward_badge_name
    end

    def secret_key
      SiteSetting.discourse_donations_secret_key
    end

    def stripe_options
      {
        description: SiteSetting.discourse_donations_description,
        currency: SiteSetting.discourse_donations_currency
      }
    end

    def user_params
      params.permit(:user_id, :name, :username, :email, :password, :stripeToken, :cause, :type, :amount, :create_account)
    end

    def set_user
      user = current_user

      if user_params[:user_id].present?
        if record = User.find_by(user_params[:user_id])
          user = record
        end
      end

      @user = user
    end

    def set_email
      email = nil

      if user_params[:email].present?
        email = user_params[:email]
      elsif @user
        email = @user.try(:email)
      end

      @email = email
    end
  end
end