class UrlHelper # At the moment this handles invalid URLs that browser address bar accepts # where second # is not encoded # # Longer term we can add support of simpleidn and encode unicode domains def self.relaxed_parse(url) url, fragment = url.split("#", 2) uri = URI.parse(url) if uri fragment = URI.escape(fragment) if fragment&.include?('#') uri.fragment = fragment uri end rescue URI::Error end def self.is_local(url) url.present? && ( Discourse.store.has_been_uploaded?(url) || !!(url =~ Regexp.new("^#{Discourse.base_uri}/(assets|plugins|images)/")) || url.start_with?(Discourse.asset_host || Discourse.base_url_no_prefix) ) end def self.absolute(url, cdn = Discourse.asset_host) cdn = "https:" << cdn if cdn && cdn =~ /^\/\// url =~ /^\/[^\/]/ ? (cdn || Discourse.base_url_no_prefix) + url : url end def self.absolute_without_cdn(url) self.absolute(url, nil) end def self.schemaless(url) url.sub(/^http:/i, "") end DOUBLE_ESCAPED_REGEXP ||= /%25([0-9a-f]{2})/i # Prevents double URL encode # https://stackoverflow.com/a/37599235 def self.escape_uri(uri, pattern = URI::UNSAFE) encoded = URI.encode(uri, pattern) encoded.gsub!(DOUBLE_ESCAPED_REGEXP, '%\1') encoded end def self.cook_url(url) return url unless is_local(url) uri = URI.parse(url) filename = File.basename(uri.path) is_attachment = !FileHelper.is_supported_image?(filename) no_cdn = SiteSetting.login_required || SiteSetting.prevent_anons_from_downloading_files url = absolute_without_cdn(url) unless is_attachment && no_cdn url = Discourse.store.cdn_url(url) url = local_cdn_url(url) if Discourse.store.external? end schemaless(url) rescue URI::Error url end def self.local_cdn_url(url) return url if Discourse.asset_host.blank? url.sub(Discourse.base_url_no_prefix, Discourse.asset_host) end end