1 files changed, 93 insertions, 0 deletions
diff --git a/app/models/integrations/confluence.rb b/app/models/integrations/confluence.rb
new file mode 100644
index 00000000000..30f73496993
--- /dev/null
+++ b/app/models/integrations/confluence.rb
@@ -0,0 +1,93 @@
+# frozen_string_literal: true
+
+module Integrations
+  class Confluence < Integration
+    include ActionView::Helpers::UrlHelper
+
+    VALID_SCHEME_MATCH = %r{\Ahttps?\Z}.freeze
+    VALID_HOST_MATCH = %r{\A.+\.atlassian\.net\Z}.freeze
+    VALID_PATH_MATCH = %r{\A/wiki(/|\Z)}.freeze
+
+    prop_accessor :confluence_url
+
+    validates :confluence_url, presence: true, if: :activated?
+    validate :validate_confluence_url_is_cloud, if: :activated?
+
+    after_commit :cache_project_has_confluence
+
+    def self.to_param
+      'confluence'
+    end
+
+    def self.supported_events
+      %w()
+    end
+
+    def title
+      s_('ConfluenceService|Confluence Workspace')
+    end
+
+    def description
+      s_('ConfluenceService|Link to a Confluence Workspace from the sidebar.')
+    end
+
+    def help
+      return unless project&.wiki_enabled?
+
+      if activated?
+        wiki_url = project.wiki.web_url
+
+        s_(
+          'ConfluenceService|Your GitLab wiki is still available at %{wiki_link}. To re-enable the link to the GitLab wiki, disable this integration.' %
+          { wiki_link: link_to(wiki_url, wiki_url) }
+        ).html_safe
+      else
+        s_('ConfluenceService|Link to a Confluence Workspace from the sidebar. Enabling this integration replaces the "Wiki" sidebar link with a link to the Confluence Workspace. The GitLab wiki is still available at the original URL.').html_safe
+      end
+    end
+
+    def fields
+      [
+        {
+          type: 'text',
+          name: 'confluence_url',
+          title: s_('Confluence Cloud Workspace URL'),
+          placeholder: 'https://example.atlassian.net/wiki',
+          required: true
+        }
+      ]
+    end
+
+    def can_test?
+      false
+    end
+
+    private
+
+    def validate_confluence_url_is_cloud
+      unless confluence_uri_valid?
+        errors.add(:confluence_url, 'URL must be to a Confluence Cloud Workspace hosted on atlassian.net')
+      end
+    end
+
+    def confluence_uri_valid?
+      return false unless confluence_url
+
+      uri = URI.parse(confluence_url)
+
+      (uri.scheme&.match(VALID_SCHEME_MATCH) &&
+        uri.host&.match(VALID_HOST_MATCH) &&
+        uri.path&.match(VALID_PATH_MATCH)).present?
+
+    rescue URI::InvalidURIError
+      false
+    end
+
+    def cache_project_has_confluence
+      return unless project && !project.destroyed?
+
+      project.project_setting.save! unless project.project_setting.persisted?
+      project.project_setting.update_column(:has_confluence, active?)
+    end
+  end
+end