1 files changed, 32 insertions, 46 deletions

diff --git a/lib/gitlab/auth/user_auth_finders.rb b/lib/gitlab/auth/user_auth_finders.rb
index d1f5bf84873..93f3cae0a95 100644
--- a/lib/gitlab/auth/user_auth_finders.rb
+++ b/lib/gitlab/auth/user_auth_finders.rb
@@ -2,77 +2,67 @@ module Gitlab
   module Auth
     module UserAuthFinders
       # Check the Rails session for valid authentication details
-      def find_session_user
+      def find_user_from_warden
         request.env['warden']&.authenticate if verified_request?
       end
 
-      def find_user_by_private_token
-        token = private_token
-        return unless token.present?
-
-        user =
-          find_user_by_authentication_token(token) ||
-          find_user_by_personal_access_token(token)
+      def find_user_by_rss_token
+        return unless request.format.atom?
 
-        raise_unauthorized_error! unless user
+        token = request.params[:rss_token].presence
+        return unless token.present?
 
-        user
+        handle_return_value!(User.find_by_rss_token(token))
       end
 
-      def find_user_by_rss_token
-        return unless request.path.ends_with?('atom') || request.format.atom?
+      def find_user_from_access_token
+        return unless access_token
 
-        token = request.params[:rss_token].presence
-        return unless token.present?
+        validate_access_token!
 
-        user = User.find_by_rss_token(token)
-        raise_unauthorized_error! unless user
+        handle_return_value!(access_token&.user)
+      end
 
-        user
+      def validate_access_token!(scopes: [])
       end
 
-      def find_user_by_oauth_token
-        access_token = find_oauth_access_token
+      private
 
-        return unless access_token
+      def handle_return_value!(value, &block)
+        return unless value
 
-        find_user_by_access_token(access_token)
+        block_given? ? yield(value) : value
       end
 
-      private
+      def access_token
+        return @access_token if defined?(@access_token)
+
+        @access_token = find_oauth_access_token || find_personal_access_token
+      end
 
       def private_token
         request.params[:private_token].presence ||
           request.headers['PRIVATE-TOKEN'].presence
       end
 
-      def find_user_by_authentication_token(token_string)
-        User.find_by_authentication_token(token_string)
-      end
-
-      def find_user_by_personal_access_token(token_string)
-        access_token = PersonalAccessToken.find_by_token(token_string)
-        return unless access_token
+      def find_personal_access_token
+        token = private_token.to_s
+        return unless token.present?
 
-        find_user_by_access_token(access_token)
+        # Expiration, revocation and scopes are verified in `validate_access_token!`
+        handle_return_value!(PersonalAccessToken.find_by(token: token))
       end
 
       def find_oauth_access_token
-        return @oauth_access_token if defined?(@oauth_access_token)
-
         current_request = ensure_action_dispatch_request(request)
         token = Doorkeeper::OAuth::Token.from_request(current_request, *Doorkeeper.configuration.access_token_methods)
-        return @oauth_access_token = nil unless token
-
-        @oauth_access_token = OauthAccessToken.by_token(token)
-        raise_unauthorized_error! unless @oauth_access_token
-
-        @oauth_access_token.revoke_previous_refresh_token!
-        @oauth_access_token
-      end
+        return unless token
 
-      def find_user_by_access_token(access_token)
-        access_token&.user
+        # Expiration, revocation and scopes are verified in `validate_access_token!`
+        handle_return_value!(OauthAccessToken.by_token(token)) do |oauth_token|
+          oauth_token.revoke_previous_refresh_token!
+          oauth_token
+        end
       end
 
       # Check if the request is GET/HEAD, or if CSRF token is valid.
@@ -85,10 +75,6 @@ module Gitlab
 
         ActionDispatch::Request.new(request.env)
       end
-
-      def raise_unauthorized_error!
-        return nil
-      end
     end
   end
 end