1 files changed, 25 insertions, 0 deletions
diff --git a/app/models/packages/npm/metadatum.rb b/app/models/packages/npm/metadatum.rb
new file mode 100644
index 00000000000..7388c4bdbd2
--- /dev/null
+++ b/app/models/packages/npm/metadatum.rb
@@ -0,0 +1,25 @@
+# frozen_string_literal: true
+
+class Packages::Npm::Metadatum < ApplicationRecord
+  belongs_to :package, -> { where(package_type: :npm) }, inverse_of: :npm_metadatum
+
+  validates :package, presence: true
+  # From https://github.com/npm/registry/blob/master/docs/responses/package-metadata.md#abbreviated-version-object
+  validates :package_json, json_schema: { filename: "npm_package_json" }
+  validate :ensure_npm_package_type
+  validate :ensure_package_json_size
+
+  private
+
+  def ensure_npm_package_type
+    return if package&.npm?
+
+    errors.add(:base, _('Package type must be NPM'))
+  end
+
+  def ensure_package_json_size
+    return if package_json.to_s.size < 20000
+
+    errors.add(:package_json, _('structure is too large'))
+  end
+end