1 files changed, 33 insertions, 0 deletions
diff --git a/app/validators/url_validator.rb b/app/validators/url_validator.rb
new file mode 100644
index 0000000..5f790b3
--- /dev/null
+++ b/app/validators/url_validator.rb
@@ -0,0 +1,33 @@
+# SPDX-FileCopyrightText: 2020 IN COMMON Collective <collective@incommon.cc>
+#
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+# frozen_string_literal: true
+
+# = URL Validator =
+#
+# In order to be considered valid, value must be:
+#
+# - parsable as an URI
+# - use the http or https scheme
+# - have a hostname
+# - have a valid public TLD
+#
+class UrlValidator < ActiveModel::EachValidator
+  def validate_each(record, attribute, value)
+    unless valid_web_address?(value)
+      record.errors[attribute] << (options[:message] || 'is an invalid Web URL')
+    end
+  end
+
+  private
+
+  def valid_web_address?(value)
+    uri = URI.parse(value)
+    uri.is_a?(URI::HTTP) &&
+      uri.host.present? &&
+      IANA::TLD.valid?(uri.host.split('.').compact.last)
+  rescue URI::InvalidURIError
+    false
+  end
+end