1 files changed, 17 insertions, 1 deletions
diff --git a/app/models/project.rb b/app/models/project.rb
index 512c6ac1acb..de7dd42866f 100644
--- a/app/models/project.rb
+++ b/app/models/project.rb
@@ -89,6 +89,11 @@ class Project < ApplicationRecord
 
   DEFAULT_SQUASH_COMMIT_TEMPLATE = '%{title}'
 
+  # Prefix for runners_token which can be used to invalidate existing tokens.
+  # The value chosen here is GR (for Gitlab Runner) combined with the rotation
+  # date (20220225) decimal to hex encoded.
+  RUNNERS_TOKEN_PREFIX = 'GR1348941'
+
   cache_markdown_field :description, pipeline: :description
 
   default_value_for :packages_enabled, true
@@ -109,7 +114,9 @@ class Project < ApplicationRecord
   default_value_for :autoclose_referenced_issues, true
   default_value_for(:ci_config_path) { Gitlab::CurrentSettings.default_ci_config_path }
 
-  add_authentication_token_field :runners_token, encrypted: -> { Feature.enabled?(:projects_tokens_optional_encryption, default_enabled: true) ? :optional : :required }
+  add_authentication_token_field :runners_token,
+                                 encrypted: -> { Feature.enabled?(:projects_tokens_optional_encryption, default_enabled: true) ? :optional : :required },
+                                 prefix: ->(instance) { instance.runners_token_prefix }
 
   before_validation :mark_remote_mirrors_for_removal, if: -> { RemoteMirror.table_exists? }
 
@@ -1873,6 +1880,15 @@ class Project < ApplicationRecord
     ensure_runners_token!
   end
 
+  def runners_token_prefix
+    Feature.enabled?(:projects_runners_token_prefix, self, default_enabled: :yaml) ? RUNNERS_TOKEN_PREFIX : ''
+  end
+
+  override :format_runners_token
+  def format_runners_token(token)
+    "#{runners_token_prefix}#{token}"
+  end
+
   def pages_deployed?
     pages_metadatum&.deployed?
   end