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<?php
/**
* Rule compiler for Jetpack Waf.
*
* @package automattic/jetpack-waf
*/
namespace Automattic\Jetpack\Waf;
/**
* Waf_Operators class
*/
class Waf_Operators {
/**
* Returns true if the test string is found at the beginning of the input.
*
* @param string $input Input.
* @param string $test Test.
* @return string|false
*/
public function begins_with( $input, $test ) {
if ( '' === $input && '' === $test ) {
return '';
}
return substr( $input, 0, strlen( $test ) ) === $test
? $test
: false;
}
/**
* Returns true if the test string is found anywhere in the input.
*
* @param string $input Input.
* @param string $test Test.
* @return string|false
*/
public function contains( $input, $test ) {
if ( empty( $input ) || empty( $test ) ) {
return false;
}
return strpos( $input, $test ) !== false
? $test
: false;
}
/**
* Returns true if the test string with word boundaries is found anywhere in the input.
*
* @param string $input Input.
* @param string $test Test.
* @return string|false
*/
public function contains_word( $input, $test ) {
return ( $input === $test || 1 === preg_match( '/\b' . preg_quote( $test, '/' ) . '\b/Ds', $input ) )
? $test
: false;
}
/**
* Returns true if the test string is found at the end of the input.
*
* @param string $input Input.
* @param string $test Test.
* @return string|false
*/
public function ends_with( $input, $test ) {
return ( '' === $test || substr( $input, -1 * strlen( $test ) ) === $test )
? $test
: false;
}
/**
* Returns true if the input value is equal to the test value.
* If either value cannot be converted to an int it will be treated as 0.
*
* @param mixed $input Input.
* @param mixed $test Test.
* @return int|false
*/
public function eq( $input, $test ) {
return intval( $input ) === intval( $test )
? $input
: false;
}
/**
* Returns true if the input value is greater than or equal to the test value.
* If either value cannot be converted to an int it will be treated as 0.
*
* @param mixed $input Input.
* @param mixed $test Test.
* @return int|false
*/
public function ge( $input, $test ) {
return intval( $input ) >= intval( $test )
? $input
: false;
}
/**
* Returns true if the input value is greater than the test value.
* If either value cannot be converted to an int it will be treated as 0.
*
* @param mixed $input Input.
* @param mixed $test Test.
* @return int|false
*/
public function gt( $input, $test ) {
return intval( $input ) > intval( $test )
? $input
: false;
}
/**
* Returns true if the input value is less than or equal to the test value.
* If either value cannot be converted to an int it will be treated as 0.
*
* @param mixed $input Input.
* @param mixed $test Test.
* @return int|false
*/
public function le( $input, $test ) {
return intval( $input ) <= intval( $test )
? $input
: false;
}
/**
* Returns true if the input value is less than the test value.
* If either value cannot be converted to an int it will be treated as 0.
*
* @param mixed $input Input.
* @param mixed $test Test.
* @return int|false
*/
public function lt( $input, $test ) {
return intval( $input ) < intval( $test )
? $input
: false;
}
/**
* Returns false.
*
* @return false
*/
public function no_match() {
return false;
}
/**
* Uses a multi-string matching algorithm to search through $input for a number of given $words.
*
* @param string $input Input.
* @param string[] $words \AhoCorasick\MultiStringMatcher $matcher.
* @return string[]|false Returns the words that were found in $input, or FALSE if no words were found.
*/
public function pm( $input, $words ) {
$results = $this->get_multi_string_matcher( $words )->searchIn( $input );
return isset( $results[0] )
? array_map(
function ( $r ) {
return $r[1]; },
$results
)
: false;
}
/**
* The last-used pattern-matching algorithm.
*
* @var array
*/
private $last_multi_string_matcher = array( null, null );
/**
* Creates a matcher that uses the Aho-Corasick algorithm to efficiently find a number of words in an input string.
* Caches the last-used matcher so that the same word list doesn't have to be compiled multiple times.
*
* @param string[] $words Words.
* @return \AhoCorasick\MultiStringMatcher
*/
private function get_multi_string_matcher( $words ) {
// only create a new matcher entity if we don't have one already for this word list.
if ( $this->last_multi_string_matcher[0] !== $words ) {
$this->last_multi_string_matcher = array( $words, new \AhoCorasick\MultiStringMatcher( $words ) );
}
return $this->last_multi_string_matcher[1];
}
/**
* Performs a regular expression match on the input subject using the given pattern.
* Returns false if the pattern does not match, or the substring(s) of the input
* that were matched by the pattern.
*
* @param string $subject Subject.
* @param string $pattern Pattern.
* @return string[]|false
*/
public function rx( $subject, $pattern ) {
$matched = preg_match( $pattern, $subject, $matches );
return 1 === $matched
? $matches
: false;
}
/**
* Returns true if the given input string matches the test string.
*
* @param string $input Input.
* @param string $test Test.
* @return string|false
*/
public function streq( $input, $test ) {
return $input === $test
? $test
: false;
}
/**
* Returns true.
*
* @param string $input Input.
* @return bool
*/
public function unconditional_match( $input ) {
return $input;
}
/**
* Checks to see if the input string only contains characters within the given byte range
*
* @param string $input Input.
* @param array $valid_range Valid range.
* @return string
*/
public function validate_byte_range( $input, $valid_range ) {
if ( '' === $input ) {
// an empty string is considered "valid".
return false;
}
$i = 0;
while ( isset( $input[ $i ] ) ) {
$n = ord( $input[ $i ] );
if ( $n < $valid_range['min'] || $n > $valid_range['max'] ) {
return $input[ $i ];
}
$valid = false;
foreach ( $valid_range['range'] as $b ) {
if ( $n === $b || is_array( $b ) && $n >= $b[0] && $n <= $b[1] ) {
$valid = true;
break;
}
}
if ( ! $valid ) {
return $input[ $i ];
}
$i++;
}
// if there weren't any invalid bytes, return false.
return false;
}
/**
* Returns true if the input value is found anywhere inside the test value
* (i.e. the inverse of @contains)
*
* @param mixed $input Input.
* @param mixed $test Test.
* @return string|false
*/
public function within( $input, $test ) {
if ( '' === $input || '' === $test ) {
return false;
}
return stripos( $test, $input ) !== false
? $input
: false;
}
}
|