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<?php
declare(strict_types=1);
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 $matchType
*
* @return bool
*/
public static function textMatch($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 false !== strpos($haystack, $needle);
case 'equals':
return $haystack === $needle;
case 'starts-with':
return 0 === strpos($haystack, $needle);
case 'ends-with':
return strrpos($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-8859-1 to UTF-8 (latin-1),
* anything else will likely fail.
*
* @param string $input
*
* @return string
*/
public static function ensureUTF8($input)
{
$encoding = mb_detect_encoding($input, ['UTF-8', 'ISO-8859-1'], true);
if ('ISO-8859-1' === $encoding) {
return utf8_encode($input);
} else {
return $input;
}
}
}
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