1 files changed, 16 insertions, 0 deletions
diff --git a/activestorage/app/controllers/concerns/active_storage/set_blob.rb b/activestorage/app/controllers/concerns/active_storage/set_blob.rb
new file mode 100644
index 0000000000..f072954d78
--- /dev/null
+++ b/activestorage/app/controllers/concerns/active_storage/set_blob.rb
@@ -0,0 +1,16 @@
+# frozen_string_literal: true
+
+module ActiveStorage::SetBlob #:nodoc:
+  extend ActiveSupport::Concern
+
+  included do
+    before_action :set_blob
+  end
+
+  private
+    def set_blob
+      @blob = ActiveStorage::Blob.find_signed(params[:signed_blob_id] || params[:signed_id])
+    rescue ActiveSupport::MessageVerifier::InvalidSignature
+      head :not_found
+    end
+end