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<?php
namespace Zotlabs\Lib;
require_once('include/html2plain.php');
class MessageFilter {
public static function evaluate($item, $incl, $excl) {
$text = prepare_text($item['body'],((isset($item['mimetype'])) ? $item['mimetype'] : 'text/bbcode'));
$text = html2plain(($item['title']) ? $item['title'] . ' ' . $text : $text);
$lang = null;
if ((strpos($incl, 'lang=') !== false) || (strpos($excl, 'lang=') !== false) || (strpos($incl, 'lang!=') !== false) || (strpos($excl, 'lang!=') !== false)) {
$lang = detect_language($text);
}
$tags = ((isset($item['term']) && is_array($item['term']) && count($item['term'])) ? $item['term'] : false);
$until = null;
// exclude always has priority
$exclude = (($excl) ? explode("\n", $excl) : null);
if ($exclude) {
foreach ($exclude as $word) {
$word = html_entity_decode(trim($word));
if (! $word) {
continue;
}
if (isset($lang) && ((strpos($word, 'lang=') === 0) || (strpos($word, 'lang!=') === 0))) {
if (!strlen($lang)) {
// Result is ambiguous. As we are matching deny rules only at this time, continue tests.
// Any matching deny rule concludes testing.
continue;
}
if (strpos($word, 'lang=') === 0 && strcasecmp($lang, trim(substr($word, 5))) == 0) {
return false;
} elseif (strpos($word, 'lang!=') === 0 && strcasecmp($lang, trim(substr($word, 6))) != 0) {
return false;
}
}
elseif (str_starts_with($word, 'until=')) {
$until = strtotime(trim(substr($word, 6)));
if ($until > strtotime($item['created'] . ' UTC')) {
return false;
}
}
elseif (substr($word, 0, 1) === '#' && $tags) {
foreach ($tags as $t) {
if ((($t['ttype'] == TERM_HASHTAG) || ($t['ttype'] == TERM_COMMUNITYTAG)) && (($t['term'] === substr($word, 1)) || (substr($word, 1) === '*'))) {
return false;
}
}
} elseif (substr($word, 0, 1) === '$' && $tags) {
foreach ($tags as $t) {
if (($t['ttype'] == TERM_CATEGORY) && (($t['term'] === substr($word, 1)) || (substr($word, 1) === '*'))) {
return false;
}
}
} elseif (substr($word, 0, 2) === '?+') {
if (self::test_condition(substr($word, 2), $item['obj'])) {
return false;
}
} elseif (substr($word, 0, 1) === '?') {
if (self::test_condition(substr($word, 1), $item)) {
return false;
}
} elseif ((strpos($word, '/') === 0) && preg_match($word, $text)) {
return false;
} elseif (stristr($text, $word) !== false) {
return false;
}
}
}
$include = (($incl) ? explode("\n", $incl) : null);
if ($include) {
foreach ($include as $word) {
$word = html_entity_decode(trim($word));
if (! $word) {
continue;
}
if (isset($lang) && ((strpos($word, 'lang=') === 0) || (strpos($word, 'lang!=') === 0))) {
if (!strlen($lang)) {
// Result is ambiguous. However we are checking allow rules
// and an ambiguous language is always permitted.
return true;
}
if (strpos($word, 'lang=') === 0 && strcasecmp($lang, trim(substr($word, 5))) == 0) {
return true;
} elseif (strpos($word, 'lang!=') === 0 && strcasecmp($lang, trim(substr($word, 6))) != 0) {
return true;
}
}
elseif (str_starts_with($word, 'until=')) {
$until = strtotime(trim(substr($word, 6)));
if ($until > strtotime($item['created'] . ' UTC')) {
return true;
}
}
elseif (substr($word, 0, 1) === '#' && $tags) {
foreach ($tags as $t) {
if ((($t['ttype'] == TERM_HASHTAG) || ($t['ttype'] == TERM_COMMUNITYTAG)) && (($t['term'] === substr($word, 1)) || (substr($word, 1) === '*'))) {
return true;
}
}
} elseif (substr($word, 0, 1) === '$' && $tags) {
foreach ($tags as $t) {
if (($t['ttype'] == TERM_CATEGORY) && (($t['term'] === substr($word, 1)) || (substr($word, 1) === '*'))) {
return true;
}
}
} elseif (substr($word, 0, 2) === '?+') {
if (self::test_condition(substr($word, 2), $item['obj'])) {
return true;
}
} elseif (substr($word, 0, 1) === '?') {
if (self::test_condition(substr($word, 1), $item)) {
return true;
}
} elseif ((strpos($word, '/') === 0) && preg_match($word, $text)) {
return true;
} elseif (stristr($text, $word) !== false) {
return true;
}
}
} else {
return true;
}
return false;
}
/**
* Evaluate a conditional expression with support for AND (&&) and OR (||) operators.
*
* - ?foo ~= baz which will check if item.foo contains the string 'baz';
* - ?foo == baz which will check if item.foo is the string 'baz';
* - ?foo != baz which will check if item.foo is not the string 'baz';
* - ?foo >= 3 which will check if item.foo is greater than or equal to 3;
* - ?foo > 3 which will check if item.foo is greater than 3;
* - ?foo <= 3 which will check if item.foo is less than or equal to 3;
* - ?foo < 3 which will check if item.foo is less than 3;
*
* - ?foo {} baz which will check if 'baz' is an array element in item.foo
* - ?foo {*} baz which will check if 'baz' is an array key in item.foo
* - ?foo which will check for a return of a true condition for item.foo;
* - ?!foo which will check for a return of a false condition for item.foo;
*
* The values 0, '', an empty array, and an unset value will all evaluate to false.
*
* @param string $s The condition string to evaluate.
* @param array $item The associative array providing variable values.
* @return bool True if the condition is met, false otherwise.
*/
public static function test_condition($s, $item) {
$s = trim($s);
// Handle OR (||)
// Split on '||' not inside quotes
$or_parts = preg_split('/\s*\|\|\s*/', $s);
if (count($or_parts) > 1) {
foreach ($or_parts as $part) {
if (self::test_condition(ltrim($part, '?+'), $item)) {
return true;
}
}
return false;
}
// Handle AND (&&)
// Split on '&&' not inside quotes
$and_parts = preg_split('/\s*\&\&\s*/', $s);
if (count($and_parts) > 1) {
foreach ($and_parts as $part) {
if (!self::test_condition(ltrim($part, '?+'), $item)) {
return false;
}
}
return true;
}
// Basic checks
// Contains substring (case-insensitive)
if (preg_match('/(.*?)\s\~\=\s(.*?)$/', $s, $matches)) {
$x = ((array_key_exists(trim($matches[1]), $item)) ? $item[trim($matches[1])] : EMPTY_STR);
return (stripos($x, trim($matches[2])) !== false);
}
// Equality
if (preg_match('/(.*?)\s\=\=\s(.*?)$/', $s, $matches)) {
$x = ((array_key_exists(trim($matches[1]), $item)) ? $item[trim($matches[1])] : EMPTY_STR);
return ($x == trim($matches[2]));
}
// Inequality
if (preg_match('/(.*?)\s\!\=\s(.*?)$/', $s, $matches)) {
$x = ((array_key_exists(trim($matches[1]), $item)) ? $item[trim($matches[1])] : EMPTY_STR);
return ($x != trim($matches[2]));
}
// Greater than or equal
if (preg_match('/(.*?)\s\>\=\s(.*?)$/', $s, $matches)) {
$x = ((array_key_exists(trim($matches[1]), $item)) ? $item[trim($matches[1])] : EMPTY_STR);
return ($x >= trim($matches[2]));
}
// Less than or equal
if (preg_match('/(.*?)\s\<\=\s(.*?)$/', $s, $matches)) {
$x = ((array_key_exists(trim($matches[1]), $item)) ? $item[trim($matches[1])] : EMPTY_STR);
return ($x <= trim($matches[2]));
}
// Greater than
if (preg_match('/(.*?)\s\>\s(.*?)$/', $s, $matches)) {
$x = ((array_key_exists(trim($matches[1]), $item)) ? $item[trim($matches[1])] : EMPTY_STR);
return ($x > trim($matches[2]));
}
// Less than
if (preg_match('/(.*?)\s\<\s(.*?)$/', $s, $matches)) {
$x = ((array_key_exists(trim($matches[1]), $item)) ? $item[trim($matches[1])] : EMPTY_STR);
return ($x < trim($matches[2]));
}
// Array contains value
if (preg_match('/(.*?)\s\{\}\s(.*?)$/', $s, $matches)) {
$x = ((array_key_exists(trim($matches[1]), $item)) ? $item[trim($matches[1])] : EMPTY_STR);
return (is_array($x) && in_array(trim($matches[2]), $x));
}
// Array contains key
if (preg_match('/(.*?)\s\{\*\}\s(.*?)$/', $s, $matches)) {
$x = ((array_key_exists(trim($matches[1]), $item)) ? $item[trim($matches[1])] : EMPTY_STR);
return (is_array($x) && array_key_exists(trim($matches[2]), $x));
}
// Ordering of this check (for falsiness) with relation to the following one (check for truthiness) is important.
// Falsy check
if (preg_match('/\!(.*?)$/', $s, $matches)) {
$x = ((array_key_exists(trim($matches[1]), $item)) ? $item[trim($matches[1])] : EMPTY_STR);
return !$x;
}
// Truthy check (default)
if (preg_match('/(.*?)$/', $s, $matches)) {
$x = ((array_key_exists(trim($matches[1]), $item)) ? $item[trim($matches[1])] : EMPTY_STR);
return (bool)$x;
}
// If no conditions matched, return false
return false;
}
}
|
