1 files changed, 26 insertions, 0 deletions
diff --git a/app/controllers/admin/impersonations_controller.rb b/app/controllers/admin/impersonations_controller.rb
new file mode 100644
index 00000000000..8be35f00a77
--- /dev/null
+++ b/app/controllers/admin/impersonations_controller.rb
@@ -0,0 +1,26 @@
+class Admin::ImpersonationsController < Admin::ApplicationController
+  skip_before_action :authenticate_admin!
+  before_action :authenticate_impersonator!
+
+  def destroy
+    original_user = current_user
+
+    warden.set_user(impersonator, scope: :user)
+
+    Gitlab::AppLogger.info("User #{original_user.username} has stopped impersonating #{impersonator.username}")
+
+    session[:impersonator_id] = nil
+
+    redirect_to admin_user_path(original_user)
+  end
+
+  private
+
+  def impersonator
+    @impersonator ||= User.find(session[:impersonator_id]) if session[:impersonator_id]
+  end
+
+  def authenticate_impersonator!
+    render_404 unless impersonator && impersonator.is_admin? && !impersonator.blocked?
+  end
+end