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replace non-utf8 chars in content send to browser with utf8 replacement char

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before we were removing the whole string
This commit is contained in:
Ralf Becker 2018-03-01 17:38:45 +01:00
parent f800ab008b
commit 205cf9c588
1 changed files with 26 additions and 3 deletions
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29
api/src/Json/Response.php
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@ -262,7 +262,7 @@ class Response extends Msg
}
/**
* Set everything in $var to null, that does not json_encode, eg. because no valid utf-8
* Replace everything in $var which is not utf-8, that does not json_encode, eg. because no valid utf-8
*
* @param midex $var
* @param string $prefix =''
@ -274,8 +274,8 @@ class Response extends Msg
if (is_scalar($var))
{
error_log(__METHOD__."() json_encode($prefix='$var') === false --> setting it to null");
$var = null;
error_log(__METHOD__."() json_encode($prefix='$var') === false --> replacing it");
$var = self::cleanUtf8($var);
}
else
{
@ -287,6 +287,29 @@ class Response extends Msg
return $var;
}
const UTF8_REPLACEMENT_CHAR = "\xEF\xBF\xBD";
/**
* Replace non-utf8 chars in a string with a valid replacement char
*
* @param string $_str
* @return string
*/
public static function cleanUtf8($_str)
{
//reject overly long 2 byte sequences, as well as characters above U+10000 and replace with ?
$string = preg_replace('/[\x00-\x08\x10\x0B\x0C\x0E-\x19\x7F]'.
'|[\x00-\x7F][\x80-\xBF]+'.
'|([\xC0\xC1]|[\xF0-\xFF])[\x80-\xBF]*'.
'|[\xC2-\xDF]((?![\x80-\xBF])|[\x80-\xBF]{2,})'.
'|[\xE0-\xEF](([\x80-\xBF](?![\x80-\xBF]))|(?![\x80-\xBF]{2})|[\x80-\xBF]{3,})/S',
self::UTF8_REPLACEMENT_CHAR, $_str);
//reject overly long 3 byte sequences and UTF-16 surrogates and replace with ?
return preg_replace('/\xE0[\x80-\x9F][\x80-\xBF]'.
'|\xED[\xA0-\xBF][\x80-\xBF]/S', self::UTF8_REPLACEMENT_CHAR, $string );
}
/**
* Function which can be used to add an event listener callback function to
* the "beforeSendData" callback. This callback might be used to add a response