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<?php
namespace Sabre\DAV;
/**
* String utility
*
* This class is mainly used to implement the 'text-match' filter, used by both
* the CalDAV calendar-query REPORT, and CardDAV addressbook-query REPORT.
* Because they both need it, it was decided to put it in Sabre\DAV instead.
*
* @copyright Copyright (C) fruux GmbH (https://fruux.com/)
* @author Evert Pot (http://evertpot.com/)
* @license http://sabre.io/license/ Modified BSD License
*/
class StringUtil {
/**
* Checks if a needle occurs in a haystack ;)
*
* @param string $haystack
* @param string $needle
* @param string $collation
* @param string $matchType
* @return bool
*/
static function textMatch($haystack, $needle, $collation, $matchType = 'contains') {
switch ($collation) {
case 'i;ascii-casemap' :
// default strtolower takes locale into consideration
// we don't want this.
$haystack = str_replace(range('a', 'z'), range('A', 'Z'), $haystack);
$needle = str_replace(range('a', 'z'), range('A', 'Z'), $needle);
break;
case 'i;octet' :
// Do nothing
break;
case 'i;unicode-casemap' :
$haystack = mb_strtoupper($haystack, 'UTF-8');
$needle = mb_strtoupper($needle, 'UTF-8');
break;
default :
throw new Exception\BadRequest('Collation type: ' . $collation . ' is not supported');
}
switch ($matchType) {
case 'contains' :
return strpos($haystack, $needle) !== false;
case 'equals' :
return $haystack === $needle;
case 'starts-with' :
return strpos($haystack, $needle) === 0;
case 'ends-with' :
return strrpos($haystack, $needle) === strlen($haystack) - strlen($needle);
default :
throw new Exception\BadRequest('Match-type: ' . $matchType . ' is not supported');
}
}
/**
* This method takes an input string, checks if it's not valid UTF-8 and
* attempts to convert it to UTF-8 if it's not.
*
* Note that currently this can only convert ISO-8559-1 to UTF-8 (latin-1),
* anything else will likely fail.
*
* @param string $input
* @return string
*/
static function ensureUTF8($input) {
$encoding = mb_detect_encoding($input, ['UTF-8', 'ISO-8859-1'], true);
if ($encoding === 'ISO-8859-1') {
return utf8_encode($input);
} else {
return $input;
}
}
}
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