1 files changed, 105 insertions, 0 deletions
diff --git a/app/models/integrations/telegram.rb b/app/models/integrations/telegram.rb
new file mode 100644
index 00000000000..9af12c712c6
--- /dev/null
+++ b/app/models/integrations/telegram.rb
@@ -0,0 +1,105 @@
+# frozen_string_literal: true
+
+module Integrations
+  class Telegram < BaseChatNotification
+    TELEGRAM_HOSTNAME = "https://api.telegram.org/bot%{token}/sendMessage"
+
+    field :token,
+      section: SECTION_TYPE_CONNECTION,
+      help: -> { s_('TelegramIntegration|Unique authentication token.') },
+      non_empty_password_title: -> { s_('TelegramIntegration|New token') },
+      non_empty_password_help: -> { s_('TelegramIntegration|Leave blank to use your current token.') },
+      placeholder: '123456:ABC-DEF1234ghIkl-zyx57W2v1u123ew11',
+      exposes_secrets: true,
+      is_secret: true,
+      required: true
+
+    field :room,
+      title: 'Channel identifier',
+      section: SECTION_TYPE_CONFIGURATION,
+      help: "Unique identifier for the target chat or the username of the target channel (format: @channelusername)",
+      placeholder: '@channelusername',
+      required: true
+
+    with_options if: :activated? do
+      validates :token, :room, presence: true
+    end
+
+    before_validation :set_webhook
+
+    def title
+      'Telegram'
+    end
+
+    def description
+      s_("TelegramIntegration|Send notifications about project events to Telegram.")
+    end
+
+    def self.to_param
+      'telegram'
+    end
+
+    def help
+      docs_link = ActionController::Base.helpers.link_to(
+        _('Learn more.'),
+        Rails.application.routes.url_helpers.help_page_url('user/project/integrations/telegram'),
+        target: '_blank',
+        rel: 'noopener noreferrer'
+      )
+      format(s_("TelegramIntegration|Send notifications about project events to Telegram. %{docs_link}"),
+        docs_link: docs_link.html_safe
+      )
+    end
+
+    def fields
+      self.class.fields + build_event_channels
+    end
+
+    def self.supported_events
+      super - ['deployment']
+    end
+
+    def sections
+      [
+        {
+          type: SECTION_TYPE_CONNECTION,
+          title: s_('Integrations|Connection details'),
+          description: help
+        },
+        {
+          type: SECTION_TYPE_TRIGGER,
+          title: s_('Integrations|Trigger'),
+          description: s_('Integrations|An event will be triggered when one of the following items happen.')
+        },
+        {
+          type: SECTION_TYPE_CONFIGURATION,
+          title: s_('Integrations|Notification settings'),
+          description: s_('Integrations|Configure the scope of notifications.')
+        }
+      ]
+    end
+
+    private
+
+    def set_webhook
+      self.webhook = format(TELEGRAM_HOSTNAME, token: token) if token.present?
+    end
+
+    def notify(message, _opts)
+      body = {
+        text: message.summary,
+        chat_id: room,
+        parse_mode: 'markdown'
+      }
+
+      header = { 'Content-Type' => 'application/json' }
+      response = Gitlab::HTTP.post(webhook, headers: header, body: Gitlab::Json.dump(body))
+
+      response if response.success?
+    end
+
+    def custom_data(data)
+      super(data).merge(markdown: true)
+    end
+  end
+end