Merge branch 'blackst0ne-add-discord-service' into 'master'

Add Discord integration

Closes #21635

See merge request gitlab-org/gitlab-ce!22684

15 files changed, 374 insertions, 242 deletions

diff --git a/Gemfile b/Gemfile
index 387d7f9a260..80949178ea6 100644
--- a/Gemfile
+++ b/Gemfile
@@ -204,6 +204,9 @@ gem 'redis-rails', '~> 5.0.2'
 gem 'redis', '~> 3.2'
 gem 'connection_pool', '~> 2.0'
 
+# Discord integration
+gem 'discordrb-webhooks-blackst0ne', '~> 3.3', require: false
+
 # HipChat integration
 gem 'hipchat', '~> 1.5.0'
 
diff --git a/Gemfile.lock b/Gemfile.lock
index 032de064820..d111c2cffed 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -162,6 +162,8 @@ GEM
       rotp (~> 2.0)
     diff-lcs (1.3)
     diffy (3.1.0)
+    discordrb-webhooks-blackst0ne (3.3.0)
+      rest-client (~> 2.0)
     docile (1.1.5)
     domain_name (0.5.20180417)
       unf (>= 0.0.5, < 1.0.0)
@@ -965,6 +967,7 @@ DEPENDENCIES
   devise (~> 4.4)
   devise-two-factor (~> 3.0.0)
   diffy (~> 3.1.0)
+  discordrb-webhooks-blackst0ne (~> 3.3)
   doorkeeper (~> 4.3)
   doorkeeper-openid_connect (~> 1.5)
   ed25519 (~> 1.2)
diff --git a/Gemfile.rails5.lock b/Gemfile.rails5.lock
index 931976d18c1..013695e5eae 100644
--- a/Gemfile.rails5.lock
+++ b/Gemfile.rails5.lock
@@ -165,6 +165,8 @@ GEM
       rotp (~> 2.0)
     diff-lcs (1.3)
     diffy (3.1.0)
+    discordrb-webhooks-blackst0ne (3.3.0)
+      rest-client (~> 2.0)
     docile (1.1.5)
     domain_name (0.5.20180417)
       unf (>= 0.0.5, < 1.0.0)
@@ -974,6 +976,7 @@ DEPENDENCIES
   devise (~> 4.4)
   devise-two-factor (~> 3.0.0)
   diffy (~> 3.1.0)
+  discordrb-webhooks-blackst0ne (~> 3.3)
   doorkeeper (~> 4.3)
   doorkeeper-openid_connect (~> 1.5)
   ed25519 (~> 1.2)
diff --git a/app/models/project.rb b/app/models/project.rb
index 48905547ab4..d87fc1e4b86 100644
--- a/app/models/project.rb
+++ b/app/models/project.rb
@@ -135,6 +135,7 @@ class Project < ActiveRecord::Base
 
   # Project services
   has_one :campfire_service
+  has_one :discord_service
   has_one :drone_ci_service
   has_one :emails_on_push_service
   has_one :pipelines_email_service
diff --git a/app/models/project_services/discord_service.rb b/app/models/project_services/discord_service.rb
new file mode 100644
index 00000000000..21afd14dbff
--- /dev/null
+++ b/app/models/project_services/discord_service.rb
@@ -0,0 +1,57 @@
+# frozen_string_literal: true
+
+require "discordrb/webhooks"
+
+class DiscordService < ChatNotificationService
+  def title
+    "Discord Notifications"
+  end
+
+  def description
+    "Receive event notifications in Discord"
+  end
+
+  def self.to_param
+    "discord"
+  end
+
+  def help
+    "This service sends notifications about project events to Discord channels.<br />
+    To set up this service:
+    <ol>
+      <li><a href='https://support.discordapp.com/hc/en-us/articles/228383668-Intro-to-Webhooks'>Setup a custom Incoming Webhook</a>.</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)
+    # No-op.
+  end
+
+  def default_channel_placeholder
+    # No-op.
+  end
+
+  def default_fields
+    [
+      { type: "text", name: "webhook", placeholder: "e.g. https://discordapp.com/api/webhooks/…" },
+      { type: "checkbox", name: "notify_only_broken_pipelines" },
+      { type: "checkbox", name: "notify_only_default_branch" }
+    ]
+  end
+
+  private
+
+  def notify(message, opts)
+    client = Discordrb::Webhooks::Client.new(url: webhook)
+
+    client.execute do |builder|
+      builder.content = message.pretext
+    end
+  end
+
+  def custom_data(data)
+    super(data).merge(markdown: true)
+  end
+end
diff --git a/app/models/service.rb b/app/models/service.rb
index 4dbda7acab6..5b8bf6e7cf0 100644
--- a/app/models/service.rb
+++ b/app/models/service.rb
@@ -253,6 +253,7 @@ class Service < ActiveRecord::Base
       bugzilla
       campfire
       custom_issue_tracker
+      discord
       drone_ci
       emails_on_push
       external_wiki
diff --git a/changelogs/unreleased/blackst0ne-add-discord-service.yml b/changelogs/unreleased/blackst0ne-add-discord-service.yml
new file mode 100644
index 00000000000..85dedf6d81f
--- /dev/null
+++ b/changelogs/unreleased/blackst0ne-add-discord-service.yml
@@ -0,0 +1,5 @@
+---
+title: Add Discord integration
+merge_request: 22684
+author: "@blackst0ne"
+type: added
diff --git a/doc/user/project/integrations/discord_notifications.md b/doc/user/project/integrations/discord_notifications.md
new file mode 100644
index 00000000000..e157f5cc106
--- /dev/null
+++ b/doc/user/project/integrations/discord_notifications.md
@@ -0,0 +1,29 @@
+# Discord Notifications service
+
+> [Introduced](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/22684) in GitLab 11.5.
+
+The Discord Notifications service sends event notifications from GitLab to the channel for which the webhook was created.
+
+To send GitLab event notifications to a Discord channel, create a webhook in Discord and configure it in GitLab.
+
+## Create webhook
+
+1. Open the Discord channel you want to receive GitLab event notifications.
+1. From the channel menu, select **Edit channel**.
+1. Click on **Webhooks** menu item.
+1. Click the **Create Webhook** button and fill in the name of the bot that will post the messages. Optionally, edit the avatar.
+1. Note the URL from the **WEBHOOK URL** field.
+1. Click the **Save** button.
+
+## Configure created webhook in GitLab
+
+With the webhook URL created in the Discord channel, you can set up the Discord Notifications service in GitLab.
+
+1. Navigate to the [Integrations page](project_services.md#accessing-the-project-services) in your project's settings. That is, **Project > Settings > Integrations**.
+1. Select the **Discord Notifications** project service to configure it.
+1. Check the **Active** checkbox to turn on the service.
+1. Check the checkboxes corresponding to the GitLab events for which you want to send notifications to Discord.
+1. Paste the webhook URL that you copied from the create Discord webhook step.
+1. Configure the remaining options and click the **Save changes** button.
+
+The Discord channel you created the webhook for will now receive notification of the GitLab events that were configured.
diff --git a/doc/user/project/integrations/project_services.md b/doc/user/project/integrations/project_services.md
index efb0381d7aa..be45ce46dfd 100644
--- a/doc/user/project/integrations/project_services.md
+++ b/doc/user/project/integrations/project_services.md
@@ -30,6 +30,7 @@ Click on the service links to see further configuration instructions and details
 | [Bugzilla](bugzilla.md) | Bugzilla issue tracker |
 | Campfire | Simple web-based real-time group chat |
 | Custom Issue Tracker | Custom issue tracker |
+| [Discord Notifications](discord_notifications.md) | Receive event notifications in Discord |
 | Drone CI | Continuous Integration platform built on Docker, written in Go |
 | [Emails on push](emails_on_push.md) | Email the commits and diff of each push to a list of recipients |
 | External Wiki | Replaces the link to the internal wiki with a link to an external wiki |
diff --git a/lib/api/services.rb b/lib/api/services.rb
index 0ae05ce08f1..1cb3b8a7277 100644
--- a/lib/api/services.rb
+++ b/lib/api/services.rb
@@ -298,6 +298,14 @@ module API
           desc: 'Title'
         }
       ],
+      'discord' => [
+        {
+          required: true,
+          name: :webhook,
+          type: String,
+          desc: 'Discord webhook. e.g. https://discordapp.com/api/webhooks/…'
+        }
+      ],
       'drone-ci' => [
         {
           required: true,
@@ -677,6 +685,7 @@ module API
       BuildkiteService,
       CampfireService,
       CustomIssueTrackerService,
+      DiscordService,
       DroneCiService,
       EmailsOnPushService,
       ExternalWikiService,
diff --git a/spec/lib/gitlab/import_export/all_models.yml b/spec/lib/gitlab/import_export/all_models.yml
index f4efa450cca..1d184375a52 100644
--- a/spec/lib/gitlab/import_export/all_models.yml
+++ b/spec/lib/gitlab/import_export/all_models.yml
@@ -198,6 +198,7 @@ project:
 - last_event
 - services
 - campfire_service
+- discord_service
 - drone_ci_service
 - emails_on_push_service
 - pipelines_email_service
diff --git a/spec/models/project_services/discord_service_spec.rb b/spec/models/project_services/discord_service_spec.rb
new file mode 100644
index 00000000000..be82f223478
--- /dev/null
+++ b/spec/models/project_services/discord_service_spec.rb
@@ -0,0 +1,11 @@
+# frozen_string_literal: true
+
+require "spec_helper"
+
+describe DiscordService do
+  it_behaves_like "chat service", "Discord notifications" do
+    let(:client) { Discordrb::Webhooks::Client }
+    let(:client_arguments) { { url: webhook_url } }
+    let(:content_key) { :content }
+  end
+end
diff --git a/spec/models/project_services/hangouts_chat_service_spec.rb b/spec/models/project_services/hangouts_chat_service_spec.rb
index cfa55188a64..0505ac9b49c 100644
--- a/spec/models/project_services/hangouts_chat_service_spec.rb
+++ b/spec/models/project_services/hangouts_chat_service_spec.rb
@@ -1,246 +1,11 @@
-require 'spec_helper'
+# frozen_string_literal: true
 
-describe HangoutsChatService do
-  describe 'Associations' do
-    it { is_expected.to belong_to :project }
-    it { is_expected.to have_one :service_hook }
-  end
-
-  describe 'Validations' do
-    context 'when service is active' do
-      before do
-        subject.active = true
-      end
-
-      it { is_expected.to validate_presence_of(:webhook) }
-      it_behaves_like 'issue tracker service URL attribute', :webhook
-    end
-
-    context 'when service is inactive' do
-      before do
-        subject.active = false
-      end
-
-      it { is_expected.not_to validate_presence_of(:webhook) }
-    end
-  end
-
-  describe '#execute' do
-    let(:user)    { create(:user) }
-    let(:project) { create(:project, :repository) }
-    let(:webhook_url) { 'https://example.gitlab.com/' }
-
-    before do
-      allow(subject).to receive_messages(
-        project: project,
-        project_id: project.id,
-        service_hook: true,
-        webhook: webhook_url
-      )
-
-      WebMock.stub_request(:post, webhook_url)
-    end
-
-    shared_examples 'Hangouts Chat service' do
-      it 'calls Hangouts Chat API' do
-        subject.execute(sample_data)
-
-        expect(WebMock)
-          .to have_requested(:post, webhook_url)
-          .with { |req| req.body =~ /\A{"text":.+}\Z/ }
-          .once
-      end
-    end
-
-    context 'with push events' do
-      let(:sample_data) do
-        Gitlab::DataBuilder::Push.build_sample(project, user)
-      end
-
-      it_behaves_like 'Hangouts Chat service'
-
-      it 'specifies the webhook when it is configured' do
-        expect(HangoutsChat::Sender).to receive(:new).with(webhook_url).and_return(double(:hangouts_chat_service).as_null_object)
-
-        subject.execute(sample_data)
-      end
-
-      context 'with not default branch' do
-        let(:sample_data) do
-          Gitlab::DataBuilder::Push.build(project, user, nil, nil, 'not-the-default-branch')
-        end
-
-        context 'when notify_only_default_branch enabled' do
-          before do
-            subject.notify_only_default_branch = true
-          end
-
-          it 'does not call the Hangouts Chat API' do
-            result = subject.execute(sample_data)
-
-            expect(result).to be_falsy
-          end
-        end
-
-        context 'when notify_only_default_branch disabled' do
-          before do
-            subject.notify_only_default_branch = false
-          end
-
-          it_behaves_like 'Hangouts Chat service'
-        end
-      end
-    end
-
-    context 'with issue events' do
-      let(:opts) { { title: 'Awesome issue', description: 'please fix' } }
-      let(:sample_data) do
-        service = Issues::CreateService.new(project, user, opts)
-        issue = service.execute
-        service.hook_data(issue, 'open')
-      end
-
-      it_behaves_like 'Hangouts Chat service'
-    end
-
-    context 'with merge events' do
-      let(:opts) do
-        {
-          title: 'Awesome merge_request',
-          description: 'please fix',
-          source_branch: 'feature',
-          target_branch: 'master'
-        }
-      end
-
-      let(:sample_data) do
-        service = MergeRequests::CreateService.new(project, user, opts)
-        merge_request = service.execute
-        service.hook_data(merge_request, 'open')
-      end
-
-      before do
-        project.add_developer(user)
-      end
+require "spec_helper"
 
-      it_behaves_like 'Hangouts Chat service'
-    end
-
-    context 'with wiki page events' do
-      let(:opts) do
-        {
-          title: 'Awesome wiki_page',
-          content: 'Some text describing some thing or another',
-          format: 'md',
-          message: 'user created page: Awesome wiki_page'
-        }
-      end
-      let(:wiki_page) { create(:wiki_page, wiki: project.wiki, attrs: opts) }
-      let(:sample_data) { Gitlab::DataBuilder::WikiPage.build(wiki_page, user, 'create') }
-
-      it_behaves_like 'Hangouts Chat service'
-    end
-
-    context 'with note events' do
-      let(:sample_data) { Gitlab::DataBuilder::Note.build(note, user) }
-
-      context 'with commit comment' do
-        let(:note) do
-          create(:note_on_commit, author: user,
-                                  project: project,
-                                  commit_id: project.repository.commit.id,
-                                  note: 'a comment on a commit')
-        end
-
-        it_behaves_like 'Hangouts Chat service'
-      end
-
-      context 'with merge request comment' do
-        let(:note) do
-          create(:note_on_merge_request, project: project,
-                                         note: 'merge request note')
-        end
-
-        it_behaves_like 'Hangouts Chat service'
-      end
-
-      context 'with issue comment' do
-        let(:note) do
-          create(:note_on_issue, project: project, note: 'issue note')
-        end
-
-        it_behaves_like 'Hangouts Chat service'
-      end
-
-      context 'with snippet comment' do
-        let(:note) do
-          create(:note_on_project_snippet, project: project,
-                                           note: 'snippet note')
-        end
-
-        it_behaves_like 'Hangouts Chat service'
-      end
-    end
-
-    context 'with pipeline events' do
-      let(:pipeline) do
-        create(:ci_pipeline,
-               project: project, status: status,
-               sha: project.commit.sha, ref: project.default_branch)
-      end
-      let(:sample_data) { Gitlab::DataBuilder::Pipeline.build(pipeline) }
-
-      context 'with failed pipeline' do
-        let(:status) { 'failed' }
-
-        it_behaves_like 'Hangouts Chat service'
-      end
-
-      context 'with succeeded pipeline' do
-        let(:status) { 'success' }
-
-        context 'with default notify_only_broken_pipelines' do
-          it 'does not call Hangouts Chat API' do
-            result = subject.execute(sample_data)
-
-            expect(result).to be_falsy
-          end
-        end
-
-        context 'when notify_only_broken_pipelines is false' do
-          before do
-            subject.notify_only_broken_pipelines = false
-          end
-
-          it_behaves_like 'Hangouts Chat service'
-        end
-      end
-
-      context 'with not default branch' do
-        let(:pipeline) do
-          create(:ci_pipeline, project: project, status: 'failed', ref: 'not-the-default-branch')
-        end
-
-        context 'when notify_only_default_branch enabled' do
-          before do
-            subject.notify_only_default_branch = true
-          end
-
-          it 'does not call the Hangouts Chat API' do
-            result = subject.execute(sample_data)
-
-            expect(result).to be_falsy
-          end
-        end
-
-        context 'when notify_only_default_branch disabled' do
-          before do
-            subject.notify_only_default_branch = false
-          end
-
-          it_behaves_like 'Hangouts Chat service'
-        end
-      end
-    end
+describe HangoutsChatService do
+  it_behaves_like "chat service", "Hangouts Chat" do
+    let(:client) { HangoutsChat::Sender }
+    let(:client_arguments) { webhook_url }
+    let(:content_key) { :text }
   end
 end
diff --git a/spec/models/project_spec.rb b/spec/models/project_spec.rb
index 471f19f9b7c..b2ca6e98068 100644
--- a/spec/models/project_spec.rb
+++ b/spec/models/project_spec.rb
@@ -33,6 +33,7 @@ describe Project do
     it { is_expected.to have_one(:asana_service) }
     it { is_expected.to have_many(:boards) }
     it { is_expected.to have_one(:campfire_service) }
+    it { is_expected.to have_one(:discord_service) }
     it { is_expected.to have_one(:drone_ci_service) }
     it { is_expected.to have_one(:emails_on_push_service) }
     it { is_expected.to have_one(:pipelines_email_service) }
diff --git a/spec/support/shared_examples/models/chat_service_spec.rb b/spec/support/shared_examples/models/chat_service_spec.rb
new file mode 100644
index 00000000000..cf1d52a9616
--- /dev/null
+++ b/spec/support/shared_examples/models/chat_service_spec.rb
@@ -0,0 +1,242 @@
+require "spec_helper"
+
+shared_examples_for "chat service" do |service_name|
+  describe "Associations" do
+    it { is_expected.to belong_to :project }
+    it { is_expected.to have_one :service_hook }
+  end
+
+  describe "Validations" do
+    context "when service is active" do
+      before do
+        subject.active = true
+      end
+
+      it { is_expected.to validate_presence_of(:webhook) }
+      it_behaves_like "issue tracker service URL attribute", :webhook
+    end
+
+    context "when service is inactive" do
+      before do
+        subject.active = false
+      end
+
+      it { is_expected.not_to validate_presence_of(:webhook) }
+    end
+  end
+
+  describe "#execute" do
+    let(:user) { create(:user) }
+    let(:project) { create(:project, :repository) }
+    let(:webhook_url) { "https://example.gitlab.com/" }
+
+    before do
+      allow(subject).to receive_messages(
+        project: project,
+        project_id: project.id,
+        service_hook: true,
+        webhook: webhook_url
+      )
+
+      WebMock.stub_request(:post, webhook_url)
+    end
+
+    shared_examples "#{service_name} service" do
+      it "calls #{service_name} API" do
+        subject.execute(sample_data)
+
+        expect(WebMock).to have_requested(:post, webhook_url).with { |req| req.body =~ /\A{"#{content_key}":.+}\Z/ }.once
+      end
+    end
+
+    context "with push events" do
+      let(:sample_data) do
+        Gitlab::DataBuilder::Push.build_sample(project, user)
+      end
+
+      it_behaves_like "#{service_name} service"
+
+      it "specifies the webhook when it is configured" do
+        expect(client).to receive(:new).with(client_arguments).and_return(double(:chat_service).as_null_object)
+
+        subject.execute(sample_data)
+      end
+
+      context "with not default branch" do
+        let(:sample_data) do
+          Gitlab::DataBuilder::Push.build(project, user, nil, nil, "not-the-default-branch")
+        end
+
+        context "when notify_only_default_branch enabled" do
+          before do
+            subject.notify_only_default_branch = true
+          end
+
+          it "does not call the Discord Webhooks API" do
+            result = subject.execute(sample_data)
+
+            expect(result).to be_falsy
+          end
+        end
+
+        context "when notify_only_default_branch disabled" do
+          before do
+            subject.notify_only_default_branch = false
+          end
+
+          it_behaves_like "#{service_name} service"
+        end
+      end
+    end
+
+    context "with issue events" do
+      let(:opts) { { title: "Awesome issue", description: "please fix" } }
+      let(:sample_data) do
+        service = Issues::CreateService.new(project, user, opts)
+        issue = service.execute
+        service.hook_data(issue, "open")
+      end
+
+      it_behaves_like "#{service_name} service"
+    end
+
+    context "with merge events" do
+      let(:opts) do
+        {
+          title: "Awesome merge_request",
+          description: "please fix",
+          source_branch: "feature",
+          target_branch: "master"
+        }
+      end
+
+      let(:sample_data) do
+        service = MergeRequests::CreateService.new(project, user, opts)
+        merge_request = service.execute
+        service.hook_data(merge_request, "open")
+      end
+
+      before do
+        project.add_developer(user)
+      end
+
+      it_behaves_like "#{service_name} service"
+    end
+
+    context "with wiki page events" do
+      let(:opts) do
+        {
+          title: "Awesome wiki_page",
+          content: "Some text describing some thing or another",
+          format: "md",
+          message: "user created page: Awesome wiki_page"
+        }
+      end
+      let(:wiki_page) { create(:wiki_page, wiki: project.wiki, attrs: opts) }
+      let(:sample_data) { Gitlab::DataBuilder::WikiPage.build(wiki_page, user, "create") }
+
+      it_behaves_like "#{service_name} service"
+    end
+
+    context "with note events" do
+      let(:sample_data) { Gitlab::DataBuilder::Note.build(note, user) }
+
+      context "with commit comment" do
+        let(:note) do
+          create(:note_on_commit,
+                 author: user,
+                 project: project,
+                 commit_id: project.repository.commit.id,
+                 note: "a comment on a commit")
+        end
+
+        it_behaves_like "#{service_name} service"
+      end
+
+      context "with merge request comment" do
+        let(:note) do
+          create(:note_on_merge_request, project: project, note: "merge request note")
+        end
+
+        it_behaves_like "#{service_name} service"
+      end
+
+      context "with issue comment" do
+        let(:note) do
+          create(:note_on_issue, project: project, note: "issue note")
+        end
+
+        it_behaves_like "#{service_name} service"
+      end
+
+      context "with snippet comment" do
+        let(:note) do
+          create(:note_on_project_snippet, project: project, note: "snippet note")
+        end
+
+        it_behaves_like "#{service_name} service"
+      end
+    end
+
+    context "with pipeline events" do
+      let(:pipeline) do
+        create(:ci_pipeline,
+               project: project, status: status,
+               sha: project.commit.sha, ref: project.default_branch)
+      end
+      let(:sample_data) { Gitlab::DataBuilder::Pipeline.build(pipeline) }
+
+      context "with failed pipeline" do
+        let(:status) { "failed" }
+
+        it_behaves_like "#{service_name} service"
+      end
+
+      context "with succeeded pipeline" do
+        let(:status) { "success" }
+
+        context "with default notify_only_broken_pipelines" do
+          it "does not call Discord Webhooks API" do
+            result = subject.execute(sample_data)
+
+            expect(result).to be_falsy
+          end
+        end
+
+        context "when notify_only_broken_pipelines is false" do
+          before do
+            subject.notify_only_broken_pipelines = false
+          end
+
+          it_behaves_like "#{service_name} service"
+        end
+      end
+
+      context "with not default branch" do
+        let(:pipeline) do
+          create(:ci_pipeline, project: project, status: "failed", ref: "not-the-default-branch")
+        end
+
+        context "when notify_only_default_branch enabled" do
+          before do
+            subject.notify_only_default_branch = true
+          end
+
+          it "does not call the Discord Webhooks API" do
+            result = subject.execute(sample_data)
+
+            expect(result).to be_falsy
+          end
+        end
+
+        context "when notify_only_default_branch disabled" do
+          before do
+            subject.notify_only_default_branch = false
+          end
+
+          it_behaves_like "#{service_name} service"
+        end
+      end
+    end
+  end
+end