1 files changed, 65 insertions, 0 deletions
diff --git a/lib/gitlab/checks/project_moved.rb b/lib/gitlab/checks/project_moved.rb
new file mode 100644
index 00000000000..3a1c0a3455e
--- /dev/null
+++ b/lib/gitlab/checks/project_moved.rb
@@ -0,0 +1,65 @@
+module Gitlab
+  module Checks
+    class ProjectMoved
+      REDIRECT_NAMESPACE = "redirect_namespace".freeze
+
+      def initialize(project, user, redirected_path, protocol)
+        @project = project
+        @user = user
+        @redirected_path = redirected_path
+        @protocol = protocol
+      end
+
+      def self.fetch_redirect_message(user_id, project_id)
+        redirect_key = redirect_message_key(user_id, project_id)
+
+        Gitlab::Redis::SharedState.with do |redis|
+          message = redis.get(redirect_key)
+          redis.del(redirect_key)
+          message
+        end
+      end
+
+      def add_redirect_message
+        Gitlab::Redis::SharedState.with do |redis|
+          key = self.class.redirect_message_key(user.id, project.id)
+          redis.setex(key, 5.minutes, redirect_message)
+        end
+      end
+
+      def redirect_message(rejected: false)
+        <<~MESSAGE.strip_heredoc
+        Project '#{redirected_path}' was moved to '#{project.full_path}'.
+
+        Please update your Git remote:
+
+          #{remote_url_message(rejected)}
+        MESSAGE
+      end
+
+      def permanent_redirect?
+        RedirectRoute.permanent.exists?(path: redirected_path)
+      end
+
+      private
+
+      attr_reader :project, :redirected_path, :protocol, :user
+
+      def self.redirect_message_key(user_id, project_id)
+        "#{REDIRECT_NAMESPACE}:#{user_id}:#{project_id}"
+      end
+
+      def remote_url_message(rejected)
+        if rejected
+          "git remote set-url origin #{url} and try again."
+        else
+          "git remote set-url origin #{url}"
+        end
+      end
+
+      def url
+        protocol == 'ssh' ? project.ssh_url_to_repo : project.http_url_to_repo
+      end
+    end
+  end
+end