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  1. Moodle
  2. MDL-44634

Regression: link to user profile in comments block fails due to double URI encoding


      There was a bug fix in MDL-28952 that was reintroduced by MDL-38431.

      The comments block was outputting a double encoded URI for user's profile, which meant that the query parameters where ignored by profile.php, denying access to the resource.

      The change in MDL-38431 seems as if it is intended to encode the URL safely by calling moodle_url->out(true). The problem occurs that later in the execution, html_writer::link() is called, which appears to encode the query parameters a second time.

      The method where the second encoding occurs seems to be in outputcomponenets.php:

          public static function attribute($name, $value) {
              if ($value instanceof moodle_url) {
                  return ' ' . $name . '="' . $value->out() . '"';
              // special case, we do not want these in output
              if ($value === null) {
                  return '';
              // no sloppy trimming here!
              return ' ' . $name . '="' . s($value) . '"';

      If there is a string, the function s() is called, which calls htmlspecialchars(), which will encode the ampersand into &

      function s($var) {
          if ($var === false) {
              return '0';
          // When we move to PHP 5.4 as a minimum version, change ENT_QUOTES on the
          // next line to ENT_QUOTES | ENT_HTML5 | ENT_SUBSTITUTE, and remove the
          // 'UTF-8' argument. Both bring a speed-increase.
          return preg_replace('/&#(\d+|x[0-9a-f]+);/i', '&#$1;', htmlspecialchars($var, ENT_QUOTES, 'UTF-8'));

      Passing in an object will cause html_writer::attribute() to call moodle_url->out(), which is how I fix this issue in my patch.

            netspot_dbezborodov Damien Bezborodov
            netspot_dbezborodov Damien Bezborodov
            Rajesh Taneja Rajesh Taneja
            Damyon Wiese Damyon Wiese
            Ankit Agarwal Ankit Agarwal
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