Monkey patching OAuth2 gem to include Stripe disconnection method

app/helpers/admin/stripe_helper.rb

@@ -1,13 +1,19 @@
+require File.join(Rails.root, '/lib/oauth2/strategy/deauthorize')
+require File.join(Rails.root, '/lib/oauth2/client')
+require 'oauth2'
 module Admin
   module StripeHelper
     class << self
       attr_accessor :client, :options
     end
+
     @options = {
       :site => 'https://connect.stripe.com',
       :authorize_url => '/oauth/authorize',
+      :deauthorize_url => '/oauth/deauthorize',
       :token_url => '/oauth/token'
     }
+
     @client = OAuth2::Client.new(
       ENV['STRIPE_CLIENT_ID'],
       ENV['STRIPE_INSTANCE_SECRET_KEY'],
@@ -23,5 +29,12 @@ module Admin
       # State param will be passed back after auth
       StripeHelper.client.auth_code.authorize_url(state: options)
     end
+
+    def deauthorize_stripe(account_id)
+      stripe_account = StripeAccount.find(account_id)
+      if stripe_account
+        response = StripeHelper.client.deauthorize(stripe_account.stripe_user_id).deauthorize_request
+      end
+    end
   end
 end

lib/oauth2/client.rb

@@ -0,0 +1,21 @@
+require 'oauth2'
+OAuth2::Client.class_eval do
+  def deauthorize_url(params = nil)
+   connection.build_url(options[:deauthorize_url]).to_s
+  end
+
+  def deauthorize(account)
+    client_object = self.dup
+    client_object.options[:stripe_user_id] = account
+    @deauthorize ||= OAuth2::Strategy::Deauthorize.new(client_object)
+  end
+
+  def deauthorize_request(params)
+    headers = params.delete(:headers)
+    opts = {}
+    opts[:body] = params
+    opts[:headers] = {'Content-Type' => 'application/x-www-form-urlencoded'}
+    opts[:headers].merge!(headers) if headers
+    request(:post, deauthorize_url, opts)
+  end
+end

lib/oauth2/strategy/deauthorize.rb

@@ -0,0 +1,24 @@
+module OAuth2
+  module Strategy
+    # Deauthorization Strategy -- for Stripe
+    class Deauthorize < Base
+      # The required query parameters for the authorize URL
+      #
+      def deauthorize_params(params = {})
+        params.merge({  'client_id' => @client.id,
+                        'stripe_user_id' => @client.options[:stripe_user_id]
+                    })
+      end
+
+      def deauthorize_url(params = {})
+       @client.deauthorize_url(deauthorize_params.merge(params))
+      end
+
+      def deauthorize_request(params = {})
+        params = params.merge(deauthorize_params).merge(client_params)
+        @client.deauthorize_request(params)
+      end
+
+    end
+  end
+end