1 files changed, 52 insertions, 0 deletions
diff --git a/app/models/integrations/external_wiki.rb b/app/models/integrations/external_wiki.rb
new file mode 100644
index 00000000000..fec435443fa
--- /dev/null
+++ b/app/models/integrations/external_wiki.rb
@@ -0,0 +1,52 @@
+# frozen_string_literal: true
+
+module Integrations
+  class ExternalWiki < Integration
+    include ActionView::Helpers::UrlHelper
+
+    prop_accessor :external_wiki_url
+    validates :external_wiki_url, presence: true, public_url: true, if: :activated?
+
+    def title
+      s_('ExternalWikiService|External wiki')
+    end
+
+    def description
+      s_('ExternalWikiService|Link to an external wiki from the sidebar.')
+    end
+
+    def self.to_param
+      'external_wiki'
+    end
+
+    def fields
+      [
+        {
+          type: 'text',
+          name: 'external_wiki_url',
+          title: s_('ExternalWikiService|External wiki URL'),
+          placeholder: s_('ExternalWikiService|https://example.com/xxx/wiki/...'),
+          help: 'Enter the URL to the external wiki.',
+          required: true
+        }
+      ]
+    end
+
+    def help
+      docs_link = link_to _('Learn more.'), Rails.application.routes.url_helpers.help_page_url('user/project/wiki/index', anchor: 'link-an-external-wiki'), target: '_blank', rel: 'noopener noreferrer'
+
+      s_('Link an external wiki from the project\'s sidebar. %{docs_link}').html_safe % { docs_link: docs_link.html_safe }
+    end
+
+    def execute(_data)
+      response = Gitlab::HTTP.get(properties['external_wiki_url'], verify: true)
+      response.body if response.code == 200
+    rescue StandardError
+      nil
+    end
+
+    def self.supported_events
+      %w()
+    end
+  end
+end