1 files changed, 18 insertions, 1 deletions
diff --git a/lib/gitlab/email/handler/reply_processing.rb b/lib/gitlab/email/handler/reply_processing.rb
index ff6b2c729b2..ba9730d2685 100644
--- a/lib/gitlab/email/handler/reply_processing.rb
+++ b/lib/gitlab/email/handler/reply_processing.rb
@@ -6,13 +6,26 @@ module Gitlab
       module ReplyProcessing
         private
 
+        attr_reader :project_id, :project_slug, :project_path, :incoming_email_token
+
         def author
           raise NotImplementedError
         end
 
+        # rubocop:disable Gitlab/ModuleWithInstanceVariables
         def project
-          raise NotImplementedError
+          return @project if instance_variable_defined?(:@project)
+
+          if project_id
+            @project = Project.find_by_id(project_id)
+            @project = nil unless valid_project_slug?(@project)
+          else
+            @project = Project.find_by_full_path(project_path)
+          end
+
+          @project
         end
+        # rubocop:enable Gitlab/ModuleWithInstanceVariables
 
         def message
           @message ||= process_message
@@ -58,6 +71,10 @@ module Gitlab
 
           raise invalid_exception, msg
         end
+
+        def valid_project_slug?(found_project)
+          project_slug == found_project.full_path_slug
+        end
       end
     end
   end