public function test(&$element, $value, $group = null, &$input = null, &$form = null)
{
// If the field is empty and not required, the field is valid.
$required = (string) $element['required'] == 'true' || (string) $element['required'] == 'required';
if (!$required && empty($value)) {
return true;
}
$urlParts = MString::parse_url($value);
// See http://www.w3.org/Addressing/URL/url-spec.txt
// Use the full list or optionally specify a list of permitted schemes.
if ($element['schemes'] == '') {
$scheme = array('http', 'https', 'ftp', 'ftps', 'gopher', 'mailto', 'news', 'prospero', 'telnet', 'rlogin', 'tn3270', 'wais', 'url', 'mid', 'cid', 'nntp', 'tel', 'urn', 'ldap', 'file', 'fax', 'modem', 'git');
} else {
$scheme = explode(',', $element['schemes']);
}
// This rule is only for full URLs with schemes because parse_url does not parse
// accurately without a scheme.
// @see http://php.net/manual/en/function.parse-url.php
if (!array_key_exists('scheme', $urlParts)) {
return false;
}
$urlScheme = (string) $urlParts['scheme'];
$urlScheme = strtolower($urlScheme);
if (in_array($urlScheme, $scheme) == false) {
return false;
}
// For some schemes here must be two slashes.
if (($urlScheme == 'http' || $urlScheme == 'https' || $urlScheme == 'ftp' || $urlScheme == 'sftp' || $urlScheme == 'gopher' || $urlScheme == 'wais' || $urlScheme == 'gopher' || $urlScheme == 'prospero' || $urlScheme == 'telnet' || $urlScheme == 'git') && substr($value, strlen($urlScheme), 3) !== '://') {
return false;
}
// The best we can do for the rest is make sure that the strings are valid UTF-8
// and the port is an integer.
if (array_key_exists('host', $urlParts) && !MString::valid((string) $urlParts['host'])) {
return false;
}
if (array_key_exists('port', $urlParts) && !is_int((int) $urlParts['port'])) {
return false;
}
if (array_key_exists('path', $urlParts) && !MString::valid((string) $urlParts['path'])) {
return false;
}
return true;
}