Upstream sync

app/controllers/api/direct_uploads_controller.rb

@@ -0,0 +1,40 @@
+# Duplicated from ActiveStorage::DirectUploadsController
+# https://github.com/rails/rails/blob/v6.0.0/activestorage/app/controllers/active_storage/direct_uploads_controller.rb
+class Api::DirectUploadsController < Api::ApiController
+  include ActiveStorage::SetCurrent
+
+  def create
+    blob = ActiveStorage::Blob.create_before_direct_upload!(blob_args)
+    render jsonapi: DirectUpload.new(blob)
+  end
+
+  private
+
+  def blob_args
+    params.require(:blob).permit(:filename, :byte_size, :checksum, :content_type, :metadata).to_h.symbolize_keys
+  end
+
+  class SerializableDirectUpload < JSONAPI::Serializable::Resource
+    type 'direct_upload'
+
+    attributes :id, :key, :signed_id, :url, :headers
+  end
+
+  class DirectUpload
+    delegate :id, :key, :signed_id, to: :blob
+
+    attr_reader :blob
+
+    def initialize(blob)
+      @blob = blob
+    end
+
+    def url
+      blob.service_url_for_direct_upload 
+    end
+
+    def headers
+      blob.service_headers_for_direct_upload
+    end
+  end
+end