Add dummy Google Hangouts Chat integration

app/models/project.rb

@@ -154,6 +154,7 @@ class Project < ActiveRecord::Base
   has_one :mock_monitoring_service
   has_one :microsoft_teams_service
   has_one :packagist_service
+  has_one :hangouts_chat_service
 
   # TODO: replace these relations with the fork network versions
   has_one  :forked_project_link,  foreign_key: "forked_to_project_id"

app/models/project_services/hangouts_chat_service.rb

@@ -0,0 +1,41 @@
+class HangoutsChatService < ChatNotificationService
+  def title
+    'Hangouts Chat'
+  end
+
+  def description
+    'Receive event notifications in Google Hangouts Chat'
+  end
+
+  def self.to_param
+    'hangouts_chat'
+  end
+
+  def help
+    'This service sends notifications about projects events to Google Hangouts Chat room.<br />
+    To set up this service:
+    <ol>
+      <li><a href="https://developers.google.com/hangouts/chat/how-tos/webhooks">Set up an incoming webhook for your room</a>. All notifications will come to this room.</li>
+      <li>Paste the <strong>Webhook URL</strong> into the field below.</li>
+      <li>Select events below to enable notifications.</li>
+    </ol>'
+  end
+
+  def event_field(event)
+  end
+
+  def default_channel_placeholder
+  end
+
+  def webhook_placeholder
+    'https://chat.googleapis.com/v1/spaces…'
+  end
+
+  def default_fields
+    [
+      { type: 'text', name: 'webhook', placeholder: "e.g. #{webhook_placeholder}" },
+      { type: 'checkbox', name: 'notify_only_broken_pipelines' },
+      { type: 'checkbox', name: 'notify_only_default_branch' }
+    ]
+  end
+end

app/models/service.rb

@@ -254,6 +254,7 @@ class Service < ActiveRecord::Base
       emails_on_push
       external_wiki
       flowdock
+      hangouts_chat
       hipchat
       irker
       jira

lib/api/services.rb

@@ -368,6 +368,14 @@ module API
           desc: "The project's slug on gemnasium.com"
         }
       ],
+      'hangouts-chat' => [
+        {
+          required: true,
+          name: :webhook,
+          type: String,
+          desc: 'The Hangouts Chat webhook. e.g. https://chat.googleapis.com/v1/spaces…'
+        }
+      ],
       'hipchat' => [
         {
           required: true,
@@ -688,6 +696,7 @@ module API
       ExternalWikiService,
       FlowdockService,
       GemnasiumService,
+      HangoutsChatService,
       HipchatService,
       IrkerService,
       JiraService,

spec/lib/gitlab/import_export/all_models.yml

@@ -211,6 +211,7 @@ project:
 - slack_service
 - microsoft_teams_service
 - mattermost_service
+- hangouts_chat_service
 - buildkite_service
 - bamboo_service
 - teamcity_service

spec/models/project_spec.rb

@@ -26,6 +26,7 @@ describe Project do
     it { is_expected.to have_one(:slack_service) }
     it { is_expected.to have_one(:microsoft_teams_service) }
     it { is_expected.to have_one(:mattermost_service) }
+    it { is_expected.to have_one(:hangouts_chat_service) }
     it { is_expected.to have_one(:packagist_service) }
     it { is_expected.to have_one(:pushover_service) }
     it { is_expected.to have_one(:asana_service) }