Initial commit 🎉

.gitignore

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+/.bundle/
+/.yardoc
+/_yardoc/
+/coverage/
+/doc/
+/pkg/
+/spec/reports/
+/tmp/
+
+# rspec failure tracking
+.rspec_status
+.idea/

.rspec

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+--format documentation
+--color
+--require spec_helper

.travis.yml

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+sudo: false
+language: ruby
+rvm:
+  - 2.2.7
+before_install: gem install bundler -v 1.16.1

Gemfile

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+source "https://rubygems.org"
+
+git_source(:github) {|repo_name| "https://github.com/#{repo_name}" }
+
+gem 'mollie-api-ruby', '~> 3.1.3'
+
+# Specify your gem's dependencies in spree_mollie_gateway.gemspec
+gemspec

Gemfile.lock

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+PATH
+  remote: .
+  specs:
+    spree_mollie_gateway (0.1.0)
+      mollie-api-ruby (~> 3.1.3)
+
+GEM
+  remote: https://rubygems.org/
+  specs:
+    diff-lcs (1.3)
+    mollie-api-ruby (3.1.3)
+    rake (10.5.0)
+    rspec (3.7.0)
+      rspec-core (~> 3.7.0)
+      rspec-expectations (~> 3.7.0)
+      rspec-mocks (~> 3.7.0)
+    rspec-core (3.7.1)
+      rspec-support (~> 3.7.0)
+    rspec-expectations (3.7.0)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.7.0)
+    rspec-mocks (3.7.0)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.7.0)
+    rspec-support (3.7.1)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  bundler (~> 1.16)
+  mollie-api-ruby (~> 3.1.3)
+  rake (~> 10.0)
+  rspec (~> 3.0)
+  spree_mollie_gateway!
+
+BUNDLED WITH
+   1.16.1

README.md

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+# SpreeMollieGateway
+
+Welcome to your new gem! In this directory, you'll find the files you need to be able to package up your Ruby library into a gem. Put your Ruby code in the file `lib/spree_mollie_gateway`. To experiment with that code, run `bin/console` for an interactive prompt.
+
+TODO: Delete this and the text above, and describe your gem
+
+## Installation
+
+Add this line to your application's Gemfile:
+
+```ruby
+gem 'spree_mollie_gateway'
+```
+
+And then execute:
+
+    $ bundle
+
+Or install it yourself as:
+
+    $ gem install spree_mollie_gateway
+
+## Usage
+
+TODO: Write usage instructions here
+
+## Development
+
+After checking out the repo, run `bin/setup` to install dependencies. Then, run `rake spec` to run the tests. You can also run `bin/console` for an interactive prompt that will allow you to experiment.
+
+To install this gem onto your local machine, run `bundle exec rake install`. To release a new version, update the version number in `version.rb`, and then run `bundle exec rake release`, which will create a git tag for the version, push git commits and tags, and push the `.gem` file to [rubygems.org](https://rubygems.org).
+
+## Contributing
+
+Bug reports and pull requests are welcome on GitHub at https://github.com/[USERNAME]/spree_mollie_gateway.

Rakefile

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+require "bundler/gem_tasks"
+require "rspec/core/rake_task"
+
+RSpec::Core::RakeTask.new(:spec)
+
+task :default => :spec

app/controllers/spree/checkout_controller_decorator.rb

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+module Spree
+  module CheckoutWithMollie
+    def update
+      if payment_params_valid? && paying_with_mollie?
+        if @order.update_from_params(params, permitted_checkout_attributes, request.headers.env)
+          payment = @order.payments.last
+          payment.create_transaction!
+          mollie_payment_url = payment.payment_source.payment_url
+
+          redirect_to mollie_payment_url
+        else
+          render :edit
+        end
+      else
+        super
+      end
+    end
+  end
+
+  CheckoutController.class_eval do
+    prepend CheckoutWithMollie
+    private
+
+    def payment_method_id_param
+      params[:order][:payments_attributes].first[:payment_method_id]
+    end
+
+    def paying_with_mollie?
+      payment_method = PaymentMethod.find(payment_method_id_param)
+      mollie_payment_method?(payment_method)
+    end
+
+    def payment_params_valid?
+      (params[:state] === 'payment') && params[:order][:payments_attributes]
+    end
+
+    def mollie_payment_method?(payment_method)
+      payment_method.is_a?(Gateway::MollieGateway)
+    end
+  end
+end

app/controllers/spree/mollie_controller.rb

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+module Spree
+  class MollieController < BaseController
+    skip_before_action :verify_authenticity_token, :only => [:update_payment_status]
+
+    # When the user is redirected from Mollie back to the shop, we can check the
+    # mollie transaction status and set the Spree order state accordingly.
+    def validate_payment
+      order = Spree::Order.find_by_number(params[:order_number])
+      payment = order.payments.last
+      mollie = Spree::PaymentMethod.find_by_type('Spree::Gateway::MollieGateway')
+      mollie.update_payment_status(payment)
+
+      redirect_to order.reload.paid? ? order_path(order) : checkout_state_path(:payment)
+    end
+
+    # Mollie might send us information about a transaction through the webhook.
+    # We should update the payment state accordingly.
+    def update_payment_status
+      payment = Spree::Payment.find_by_response_code(params[:id])
+      mollie = Spree::PaymentMethod.find_by_type('Spree::Gateway::MollieGateway')
+      mollie.update_payment_status(payment)
+
+      render json: 'OK'
+    end
+  end
+end

app/models/mollie/provider.rb

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+module Mollie
+  class Provider < Client
+    # Mollie Provider base class.
+  end
+end

app/models/spree/gateway/mollie_gateway.rb

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+module Spree
+  class Gateway::MollieGateway < PaymentMethod
+    preference :api_key, :string
+
+    has_many :spree_mollie_transactions, class_name: 'Spree::MollieTransaction'
+
+    GATEWAY_NAME = 'Mollie'
+
+    def payment_source_class
+      Spree::MollieTransaction
+    end
+
+    def provider_class
+      ::Mollie::Provider
+    end
+
+    def source_required?
+      true
+    end
+
+    def available_for_order?(order)
+      true
+    end
+
+    def name
+      return GATEWAY_NAME if payments.none? || payments.last.source.nil?
+
+      case payments.last.source.payment_method_name
+        when ::Mollie::Method::IDEAL then
+          'iDEAL'
+        when ::Mollie::Method::CREDITCARD then
+          'Credit card'
+        when ::Mollie::Method::MISTERCASH then
+          'Bancontact'
+        when ::Mollie::Method::SOFORT then
+          'SOFORT Banking'
+        when ::Mollie::Method::BANKTRANSFER then
+          'Bank transfer'
+        when ::Mollie::Method::BITCOIN then
+          'Bitcoin'
+        when ::Mollie::Method::PAYPAL then
+          'PayPal'
+        when ::Mollie::Method::KBC then
+          'KBC/CBC Payment Button'
+        when ::Mollie::Method::BELFIUS then
+          'Belfius Pay Button'
+        when ::Mollie::Method::PAYSAFECARD then
+          'paysafecard'
+        when ::Mollie::Method::PODIUMCADEAUKAART then
+          'Podium Cadeaukaart'
+        when ::Mollie::Method::GIFTCARD then
+          'Giftcard'
+        when ::Mollie::Method::INGHOMEPAY then
+          'ING Home\'Pay'
+        else
+          'Mollie'
+      end
+    end
+
+    # Create a new transaction
+    def create_transaction(money, source, gateway_options)
+      payment = payments.last
+      transaction = ::Mollie::Payment.create(
+          prepare_transaction_params(payment.order, source)
+      )
+
+      invalidate_prev_transactions(payment.id)
+
+      payment.response_code = transaction.id
+      payment.save!
+
+      source.payment_id = transaction.id
+      source.payment_url = transaction.payment_url
+      source.save!
+
+      ActiveMerchant::Billing::Response.new(true, 'Transaction created')
+    end
+
+    def prepare_transaction_params(order, source)
+      order_number = order.number
+      order_params = {
+          amount: order.total.to_f,
+          description: "Spree Order ID: #{order_number}",
+          redirectUrl: "http://spree.vndg.com:3000/mollie/validate_payment/#{order_number}",
+          webhookUrl: "https://a775808b.ngrok.io/mollie/update_payment_status/#{order_number}",
+          method: source.payment_method_name,
+          metadata: {
+              order_id: order_number
+          },
+          api_key: get_preference(:api_key),
+      }
+
+      # Add additional information based on payment method.
+      if order.user_id.present?
+        if source.payment_method_name.match(Regexp.union([::Mollie::Method::BITCOIN, ::Mollie::Method::BANKTRANSFER, ::Mollie::Method::GIFTCARD]))
+          order_params.merge! ({
+              billingEmail: order.user.email
+          })
+        end
+      end
+
+      order_params
+    end
+
+    def available_payment_methods
+      ::Mollie::Method.all(
+          api_key: get_preference(:api_key),
+          include: 'issuers'
+      )
+    end
+
+    def update_payment_status(payment)
+      mollie_transaction_id = payment.response_code
+      transaction = ::Mollie::Payment.get(
+          mollie_transaction_id,
+          api_key: get_preference(:api_key)
+      )
+
+      unless payment.completed?
+        case transaction.status
+          when 'paid'
+            payment.complete! unless payment.completed?
+            payment.order.finalize!
+            payment.order.update_attributes(:state => 'complete', :completed_at => Time.now)
+          when 'cancelled', 'expired', 'failed'
+            payment.failure! unless payment.failed?
+          else
+            logger.debug 'Unhandled Mollie payment state received. Therefore we did not update the payment state.'
+        end
+      end
+
+      payment.source.update(status: payment.state)
+    end
+
+    private
+    def invalidate_prev_transactions(current_payment_id)
+      # Cancel all previous payment which are pending or are still being processed
+      payments.with_state('processing').or(payments.with_state('pending')).where.not(id: current_payment_id).each do |payment|
+        # Set internal payment state to failed
+        payment.failure! unless payment.store_credit?
+      end
+    end
+  end
+end

app/models/spree/mollie_transaction.rb

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+module Spree
+  class MollieTransaction < Spree::Base
+    belongs_to :payment_method
+    has_many :payment, as: :source
+
+    delegate :name, to: :payment_method
+
+    def actions
+      []
+    end
+
+    def method_type
+      'mollie_transaction'
+    end
+
+    def details
+      api_key = payment_method.get_preference(:api_key)
+      mollie_payment = ::Mollie::Payment.get(payment_id, api_key: api_key)
+      mollie_payment.attributes
+    end
+  end
+end

app/models/spree/payment/processing_decorator.rb

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+Spree::Payment::Processing.module_eval do
+  def create_transaction!
+    started_processing!
+    gateway_action(source, :create_transaction, :pend)
+  end
+end

app/views/spree/admin/payments/source_forms/_molliegateway.html.erb

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+<!-- Mollie payments cannot be created manually -->

app/views/spree/admin/payments/source_views/_molliegateway.html.erb

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+<fieldset data-hook="mollie_payment_source">
+  <legend><%= payment.source.name %></legend>
+  <table class="table table-condensed table-bordered">
+    <% payment.source.details.each do |key, value| %>
+      <tr>
+        <th width="20%"><%= key %></th>
+        <td><%= value %></td>
+      </tr>
+    <% end %>
+  </table>
+</fieldset>

app/views/spree/checkout/payment/_molliegateway.html.erb

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+<% param_prefix = "payment_source[#{payment_method.id}]" %>
+
+<ul class="list-group">
+  <% payment_method.available_payment_methods.each do |method| %>
+    <div class="radio list-group-item clearfix">
+
+      <label class="pull-left">
+        <%= radio_button(param_prefix, :payment_method_name, method.id) %>
+        <%= image_tag(method.image['normal']) %>
+        <%= method.description %>
+      </label>
+    </div>
+  <% end %>
+</ul>