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<?php
namespace SMW\DataValues\ValueValidators;
use SMW\ApplicationFactory;
use SMW\DataValues\ValueParsers\AllowsPatternValueParser;
use SMWDataValue as DataValue;
/**
* To support regular expressions in connection with the `Allows pattern`
* property.
*
* @license GNU GPL v2+
* @since 2.4
*
* @author mwjames
*/
class PatternConstraintValueValidator implements ConstraintValueValidator {
/**
* @var AllowsPatternContentParser
*/
private $allowsPatternValueParser;
/**
* @var boolean
*/
private $hasConstraintViolation = false;
/**
* @since 2.4
*
* @param AllowsPatternValueParser $allowsPatternValueParser
*/
public function __construct( AllowsPatternValueParser $allowsPatternValueParser ) {
$this->allowsPatternValueParser = $allowsPatternValueParser;
}
/**
* @since 2.4
*
* {@inheritDoc}
*/
public function hasConstraintViolation() {
return $this->hasConstraintViolation;
}
/**
* @since 2.4
*
* {@inheritDoc}
*/
public function validate( $dataValue ) {
$this->hasConstraintViolation = false;
if (
!$dataValue instanceof DataValue ||
$dataValue->getProperty() === null ||
!$dataValue->isEnabledFeature( SMW_DV_PVAP ) ) {
return $this->hasConstraintViolation;
}
if ( ( $reference = ApplicationFactory::getInstance()->getPropertySpecificationLookup()->getAllowedPatternBy( $dataValue->getProperty() ) ) === '' ) {
return $this->hasConstraintViolation;
}
$content = $this->allowsPatternValueParser->parse(
$reference
);
if ( !$content ) {
return $this->hasConstraintViolation;
}
// Prevent a possible remote code execution vulnerability in connection
// with PCRE
$pattern = str_replace( [ '/e' ], [ '' ], trim( $content ) );
$this->doPregMatch(
$pattern,
$dataValue,
$reference
);
}
private function doPregMatch( $pattern, $dataValue, $reference ) {
// Convert escaping as in /\d{4}
$pattern = str_replace( "/\\", "\\", $pattern );
// Add a mandatory backslash
if ( $pattern !== '' && $pattern{0} !== '/' ) {
$pattern = '/' . $pattern;
}
if ( substr( $pattern, -1 ) !== '/' ) {
$pattern = $pattern . '/';
}
// @to suppress any errors caused by an invalid regex, the user should
// test the expression before making it available
if ( !@preg_match( $pattern, $dataValue->getDataItem()->getSortKey() ) ) {
$dataValue->addErrorMsg(
[
'smw-datavalue-allows-pattern-mismatch',
$dataValue->getWikiValue(),
$reference
]
);
$this->hasConstraintViolation = true;
}
}
}
|
