FEATURE: Google Chat integration (#57)

config/locales/client.en.yml

@@ -227,3 +227,12 @@ en:
               help: "The URL provided when you create a new incomming webhook"
           errors:
             invalid_channel: "That channel does not exist on Webex"
+        google:
+          title: "Google Chat"
+          param:
+            name:
+              title: "Name"
+              help: "A name for the channel (only shown in the Discourse admin interface)"
+            webhook_url:
+              title: "Webhook URL"
+              help: "The URL provided when you create a new webhook"

config/locales/server.en.yml

@@ -98,6 +98,12 @@ en:
     chat_integration_webex_enabled: "Enable the Webex Teams chat integration provider"
     chat_integration_webex_excerpt_length: "Webex Team post excerpt length"
 
+    ###########################################
+    ######## GOOGLE SETTINGS #########
+    ###########################################
+    chat_integration_google_enabled: "Enable the 'Google Chat' chat integration provider"
+    chat_integration_google_excerpt_length: "Google Chat post excerpt length"
+
   chat_integration:
 
     all_categories: "(all categories)"
@@ -280,3 +286,12 @@ en:
       #######################################
       groupme:
         message_title: "posted"
+
+      #######################################
+      ############ GOOGLE STRINGS ###########
+      #######################################
+      google:
+        new_post: "New post on %{site_title}"
+        new_topic: "New topic on %{site_title}"
+        author: "by @%{username}"
+        link: "View on %{site_title}"

config/settings.yml

@@ -144,3 +144,10 @@ chat_integration:
     default: false
   chat_integration_webex_excerpt_length:
     default: 400
+###########################################
+########## GOOGLE CHAT SETTINGS ###########
+###########################################
+  chat_integration_google_enabled:
+    default: false
+  chat_integration_google_excerpt_length:
+    default: 100

lib/discourse_chat/provider.rb

@@ -103,3 +103,4 @@ require_relative "provider/flowdock/flowdock_provider"
 require_relative "provider/groupme/groupme_provider"
 require_relative "provider/teams/teams_provider"
 require_relative "provider/webex/webex_provider"
+require_relative "provider/google/google_provider"

lib/discourse_chat/provider/google/google_provider.rb

@@ -0,0 +1,85 @@
+# frozen_string_literal: true
+
+module DiscourseChat
+  module Provider
+    module GoogleProvider
+      PROVIDER_NAME = 'google'.freeze
+      PROVIDER_ENABLED_SETTING = :chat_integration_google_enabled
+      CHANNEL_PARAMETERS = [
+        { key: "name", regex: '^\S+$', unique: true },
+        { key: "webhook_url", regex: '^https:\/\/chat.googleapis.com\/v1\/\S+$', unique: true, hidden: true }
+      ]
+
+      def self.trigger_notification(post, channel, rule)
+        message = get_message(post)
+        uri = URI(channel.data['webhook_url'])
+
+        http = Net::HTTP.new(uri.host, uri.port)
+        http.use_ssl = (uri.scheme == 'https')
+
+        req = Net::HTTP::Post.new(uri, 'Content-Type' => 'application/json')
+        req.body = message.to_json
+        response = http.request(req)
+
+        unless response.kind_of? Net::HTTPSuccess
+          raise ::DiscourseChat::ProviderError.new info: { request: req.body, response_code: response.code, response_body: response.body }
+        end
+      end
+
+      def self.get_message(post)
+        {
+          cards: [
+            {
+              sections: [
+                {
+                  widgets: [
+                    {
+                      keyValue: {
+                        "topLabel": I18n.t("chat_integration.provider.google.new_#{post.is_first_post? ? "topic" : "post"}", site_title: SiteSetting.title),
+                        "content": post.topic.title,
+                        "contentMultiline": "false",
+                        "bottomLabel": I18n.t("chat_integration.provider.google.author", username: post.user.username),
+                        "onClick": {
+                            "openLink": {
+                                "url": post.full_url
+                            }
+                        }
+                      }
+                    },
+                  ]
+                },
+                {
+                  widgets: [
+                    {
+                      textParagraph: {
+                        text: post.excerpt(SiteSetting.chat_integration_google_excerpt_length, text_entities: true, strip_links: true, remap_emoji: true)
+                      }
+                    },
+                  ]
+                },
+                {
+                  widgets: [
+                    {
+                      buttons: [
+                        {
+                          "textButton": {
+                            "text": I18n.t("chat_integration.provider.google.link", site_title: SiteSetting.title),
+                            "onClick": {
+                              "openLink": {
+                                "url": post.full_url
+                              }
+                            }
+                          }
+                        },
+                      ]
+                    }
+                  ]
+                },
+              ],
+            }
+          ]
+        }
+      end
+    end
+  end
+end

spec/lib/discourse_chat/provider/google/google_provider_spec.rb

@@ -0,0 +1,30 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe DiscourseChat::Provider::GoogleProvider do
+  let(:post) { Fabricate(:post) }
+
+  describe '.trigger_notifications' do
+    before do
+      SiteSetting.chat_integration_google_enabled = true
+    end
+
+    let(:chan1) { DiscourseChat::Channel.create!(provider: 'google', data: { name: 'discourse', webhook_url: 'https://chat.googleapis.com/v1/abcdefg' }) }
+
+    it 'sends a webhook request' do
+      stub1 = stub_request(:post, chan1.data['webhook_url']).to_return(body: "1")
+      described_class.trigger_notification(post, chan1, nil)
+      expect(stub1).to have_been_requested.once
+    end
+
+    it 'handles errors correctly' do
+      stub1 = stub_request(:post, chan1.data['webhook_url']).to_return(status: 400, body: "{}")
+      expect(stub1).to have_been_requested.times(0)
+      expect { described_class.trigger_notification(post, chan1, nil) }.to raise_exception(::DiscourseChat::ProviderError)
+      expect(stub1).to have_been_requested.once
+    end
+
+  end
+
+end