1 files changed, 49 insertions, 0 deletions
diff --git a/app/validators/addressable_url_validator.rb b/app/validators/addressable_url_validator.rb
new file mode 100644
index 00000000000..4e1a01a1bff
--- /dev/null
+++ b/app/validators/addressable_url_validator.rb
@@ -0,0 +1,49 @@
+# UrlValidator
+#
+# Custom validator for URLs.
+#
+# By default, only URLs for the HTTP(S) protocols will be considered valid.
+# Provide a `:protocols` option to configure accepted protocols.
+#
+# Example:
+#
+#   class User < ActiveRecord::Base
+#     validates :personal_url, url: true
+#
+#     validates :ftp_url, url: { protocols: %w(ftp) }
+#
+#     validates :git_url, url: { protocols: %w(http https ssh git) }
+#   end
+#
+class AddressableUrlValidator < ActiveModel::EachValidator
+  def validate_each(record, attribute, value)
+    unless valid_url?(value)
+      record.errors.add(attribute, "must be a valid URL")
+    end
+  end
+
+  private
+
+  def default_options
+    @default_options ||= { protocols: %w(http https ssh git) }
+  end
+
+  def valid_url?(value)
+    return false unless value
+
+    value.strip!
+
+    valid_uri?(value) && valid_protocol?(value)
+  rescue Addressable::URI::InvalidURIError
+    false
+  end
+
+  def valid_uri?(value)
+    Addressable::URI.parse(strip).is_a?(Addressable::URI)
+  end
+
+  def valid_protocol?(value)
+    options = default_options.merge(self.options)
+    value =~ /\A#{URI.regexp(options[:protocols])}\z/
+  end
+end