1 files changed, 25 insertions, 0 deletions
diff --git a/app/controllers/active_storage/variants_controller.rb b/app/controllers/active_storage/variants_controller.rb
new file mode 100644
index 0000000000..dde7e1458f
--- /dev/null
+++ b/app/controllers/active_storage/variants_controller.rb
@@ -0,0 +1,25 @@
+class ActiveStorage::VariantsController < ActionController::Base
+  def show
+    if blob_key = decode_verified_blob_key
+      redirect_to processed_variant_for(blob_key).url(disposition: disposition_param)
+    else
+      head :not_found
+    end
+  end
+
+  private
+    def decode_verified_blob_key
+      ActiveStorage::VerifiedKeyWithExpiration.decode(params[:encoded_blob_key])
+    end
+
+    def processed_variant_for(blob_key)
+      ActiveStorage::Variant.new(
+        ActiveStorage::Blob.find_by!(key: blob_key),
+        ActiveStorage::Variation.decode(params[:variation_key])
+      ).processed
+    end
+
+    def disposition_param
+      params[:disposition].presence_in(%w( inline attachment )) || 'inline'
+    end
+end