attached controller OmniauthController

Gemfile

+gem 'omniauth-google'
\ No newline at end of file

Gemfile.lock

+GEM
+  specs:
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES

app/controllers/redmine_omniauth_controller.rb

+require 'account_controller'
+
+class RedmineOmniauthController < ApplicationController
+  def omniauth_google
+    AccountController.new.send(:open_id_authenticate, params[:openid_url])
+  end
+end

app/helpers/redmine_omniauth_helper.rb

+module RedmineOmniauthHelper
+end

app/views/hooks/_view_account_login_bottom.html.erb

+<% if Setting.openid? %>
+  <%= link_to image_tag('/plugin_assets/redmine_omniauth_google/images/google_login_icon.jpg'), omniauth_google_path(openid_url: 'google.com') %>
+<% end %>
\ No newline at end of file

app/views/redmine_omniauth/omniauth_google.html.erb

+<h2>RedmineOmniauthController#omniauth_google</h2>

config/routes.rb

-# Plugin's routes
-# See: http://guides.rubyonrails.org/routing.html
+get 'omniauth_google', to: 'redmine_omniauth#omniauth_google', as: :omniauth_google
\ No newline at end of file

init.rb

 require 'redmine'
-require_dependency 'redmine_omniauth_google/hooks/view_account_login_bottom_hook'
+require_dependency 'hooks/view_account_login_bottom_hook'
 
 Redmine::Plugin.register :redmine_omniauth_google do
   name 'Redmine Omniauth Google plugin'

lib/hooks/view_account_login_bottom_hook.rb

+module Hooks
+  class ViewAccountLoginBottomHook < Redmine::Hook::ViewListener
+    def view_account_login_bottom context = {}
+      context[:controller].send(:render_to_string, {
+        partial: "hooks/view_account_login_bottom",
+        locals: context
+        })
+    end
+  end
+end
\ No newline at end of file

test/functional/redmine_omniauth_controller_test.rb

+require File.expand_path('../../test_helper', __FILE__)
+
+class RedmineOmniauthControllerTest < ActionController::TestCase
+  # Replace this with your real tests.
+  def test_truth
+    assert true
+  end
+end