discourse/lib/validators/upload_url_validator.rb

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class UploadUrlValidator < ActiveModel::EachValidator
def validate_each(record, attribute, value)
if value.present?
uri = URI.parse(value) rescue nil
unless uri && Upload.exists?(url: value)
record.errors[attribute] << (options[:message] || I18n.t('errors.messages.invalid'))
end
end
end
end