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256 lines
10 KiB
PHP
256 lines
10 KiB
PHP
<?php
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namespace Code\Lib;
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require_once('include/html2plain.php');
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class MessageFilter
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{
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public static function evaluate($item, $incl, $excl, $opts = [])
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{
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// Option: plaintext
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// Improve language detection by providing a plaintext version of $item['body'] which has no markup constructs/tags.
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if (array_key_exists('plaintext', $opts)) {
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$text = $opts['plaintext'];
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}
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else {
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$text = $item['body'];
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}
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$lang = null;
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// Language matching is a bit tricky, because the language can be ambiguous (detect_language() returns '').
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// If the language is ambiguous, the message will pass (be accepted) regardless of language rules.
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if ((strpos($incl, 'lang=') !== false) || (strpos($excl, 'lang=') !== false) || (strpos($incl, 'lang!=') !== false) || (strpos($excl, 'lang!=') !== false)) {
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$detector = new LanguageDetect();
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$lang = $detector->detect($text);
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}
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$tags = ((isset($item['term']) && is_array($item['term']) && count($item['term'])) ? $item['term'] : false);
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// exclude always has priority
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$exclude = (($excl) ? explode("\n", $excl) : null);
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if ($exclude) {
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foreach ($exclude as $word) {
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$word = trim($word);
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if (! $word) {
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continue;
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}
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if (isset($lang) && ((strpos($word, 'lang=') === 0) || (strpos($word, 'lang!=') === 0))) {
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if (! strlen($lang)) {
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// Result is ambiguous. As we are matching deny rules only at this time, continue tests.
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// Any matching deny rule concludes testing.
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continue;
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}
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if (strpos($word, 'lang=') === 0 && strcasecmp($lang, trim(substr($word, 5))) == 0) {
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return false;
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} elseif (strpos($word, 'lang!=') === 0 && strcasecmp($lang, trim(substr($word, 6))) != 0) {
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return false;
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}
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}
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elseif (substr($word, 0, 1) === '#' && $tags) {
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foreach ($tags as $t) {
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if ((($t['ttype'] == TERM_HASHTAG) || ($t['ttype'] == TERM_COMMUNITYTAG)) && (($t['term'] === substr($word, 1)) || (substr($word, 1) === '*'))) {
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return false;
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}
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}
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} elseif (substr($word, 0, 1) === '$' && $tags) {
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foreach ($tags as $t) {
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if (($t['ttype'] == TERM_CATEGORY) && (($t['term'] === substr($word, 1)) || (substr($word, 1) === '*'))) {
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return false;
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}
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}
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} elseif (substr($word, 0, 2) === '?+') {
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if (self::test_condition(substr($word, 2), $item['obj'])) {
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return false;
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}
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} elseif (substr($word, 0, 1) === '?') {
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if (self::test_condition(substr($word, 1), $item)) {
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return false;
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}
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} elseif ((strpos($word, '/') === 0) && preg_match($word, $item['body'])) {
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return false;
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} elseif (stristr($item['body'], $word) !== false) {
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return false;
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}
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}
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}
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$include = (($incl) ? explode("\n", $incl) : null);
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if ($include) {
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foreach ($include as $word) {
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$word = trim($word);
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if (! $word) {
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continue;
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}
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if (isset($lang) && ((strpos($word, 'lang=') === 0) || (strpos($word, 'lang!=') === 0))) {
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if (! strlen($lang)) {
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// Result is ambiguous. However we are checking allow rules
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// and an ambiguous language is always permitted.
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return true;
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}
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if (strpos($word, 'lang=') === 0 && strcasecmp($lang, trim(substr($word, 5))) == 0) {
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return true;
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} elseif (strpos($word, 'lang!=') === 0 && strcasecmp($lang, trim(substr($word, 6))) != 0) {
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return true;
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}
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}
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elseif (substr($word, 0, 1) === '#' && $tags) {
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foreach ($tags as $t) {
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if ((($t['ttype'] == TERM_HASHTAG) || ($t['ttype'] == TERM_COMMUNITYTAG)) && (($t['term'] === substr($word, 1)) || (substr($word, 1) === '*'))) {
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return true;
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}
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}
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} elseif (substr($word, 0, 1) === '$' && $tags) {
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foreach ($tags as $t) {
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if (($t['ttype'] == TERM_CATEGORY) && (($t['term'] === substr($word, 1)) || (substr($word, 1) === '*'))) {
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return true;
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}
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}
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} elseif (substr($word, 0, 2) === '?+') {
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if (self::test_condition(substr($word, 2), $item['obj'])) {
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return true;
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}
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} elseif (substr($word, 0, 1) === '?') {
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if (self::test_condition(substr($word, 1), $item)) {
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return true;
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}
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} elseif ((strpos($word, '/') === 0) && preg_match($word, $text)) {
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return true;
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} elseif (stristr($text, $word) !== false) {
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return true;
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}
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}
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} else {
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return true;
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}
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return false;
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}
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/**
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* @brief Test for Conditional Execution conditions. Shamelessly ripped off from Code/Render/Comanche
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*
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* This is extensible. The first version of variable testing supports tests of the forms:
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*
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* - ?foo ~= baz which will check if item.foo contains the string 'baz';
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* - ?foo == baz which will check if item.foo is the string 'baz';
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* - ?foo != baz which will check if item.foo is not the string 'baz';
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* - ?foo >= 3 which will check if item.foo is greater than or equal to 3;
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* - ?foo > 3 which will check if item.foo is greater than 3;
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* - ?foo <= 3 which will check if item.foo is less than or equal to 3;
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* - ?foo < 3 which will check if item.foo is less than 3;
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*
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* - ?foo {} baz which will check if 'baz' is an array element in item.foo
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* - ?foo {*} baz which will check if 'baz' is an array key in item.foo
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* - ?foo which will check for a return of a true condition for item.foo;
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* - ?!foo which will check for a return of a false condition for item.foo;
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*
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* The values 0, '', an empty array, and an unset value will all evaluate to false.
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*
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* @param string $s
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* @param array $item
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* @return bool
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*/
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public static function test_condition($s,$item)
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{
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if (preg_match('/(.*?)\s\~\=\s(.*?)$/', $s, $matches)) {
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$x = ((array_key_exists(trim($matches[1]),$item)) ? $item[trim($matches[1])] : EMPTY_STR);
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if (stripos($x, trim($matches[2])) !== false) {
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return true;
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}
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return false;
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}
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if (preg_match('/(.*?)\s\=\=\s(.*?)$/', $s, $matches)) {
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$x = ((array_key_exists(trim($matches[1]),$item)) ? $item[trim($matches[1])] : EMPTY_STR);
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if ($x == trim($matches[2])) {
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return true;
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}
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return false;
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}
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if (preg_match('/(.*?)\s\!\=\s(.*?)$/', $s, $matches)) {
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$x = ((array_key_exists(trim($matches[1]),$item)) ? $item[trim($matches[1])] : EMPTY_STR);
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if ($x != trim($matches[2])) {
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return true;
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}
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return false;
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}
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if (preg_match('/(.*?)\s\>\=\s(.*?)$/', $s, $matches)) {
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$x = ((array_key_exists(trim($matches[1]),$item)) ? $item[trim($matches[1])] : EMPTY_STR);
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if ($x >= trim($matches[2])) {
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return true;
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}
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return false;
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}
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if (preg_match('/(.*?)\s\<\=\s(.*?)$/', $s, $matches)) {
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$x = ((array_key_exists(trim($matches[1]),$item)) ? $item[trim($matches[1])] : EMPTY_STR);
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if ($x <= trim($matches[2])) {
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return true;
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}
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return false;
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}
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if (preg_match('/(.*?)\s\>\s(.*?)$/', $s, $matches)) {
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$x = ((array_key_exists(trim($matches[1]),$item)) ? $item[trim($matches[1])] : EMPTY_STR);
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if ($x > trim($matches[2])) {
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return true;
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}
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return false;
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}
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if (preg_match('/(.*?)\s\>\s(.*?)$/', $s, $matches)) {
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$x = ((array_key_exists(trim($matches[1]),$item)) ? $item[trim($matches[1])] : EMPTY_STR);
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if ($x < trim($matches[2])) {
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return true;
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}
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return false;
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}
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if (preg_match('/[\$](.*?)\s\{\}\s(.*?)$/', $s, $matches)) {
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$x = ((array_key_exists(trim($matches[1]),$item)) ? $item[trim($matches[1])] : EMPTY_STR);
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if (is_array($x) && in_array(trim($matches[2]), $x)) {
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return true;
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}
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return false;
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}
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if (preg_match('/(.*?)\s\{\*\}\s(.*?)$/', $s, $matches)) {
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$x = ((array_key_exists(trim($matches[1]),$item)) ? $item[trim($matches[1])] : EMPTY_STR);
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if (is_array($x) && array_key_exists(trim($matches[2]), $x)) {
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return true;
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}
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return false;
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}
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// Ordering of this check (for falsiness) with relation to the following one (check for truthiness) is important.
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if (preg_match('/\!(.*?)$/', $s, $matches)) {
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$x = ((array_key_exists(trim($matches[1]),$item)) ? $item[trim($matches[1])] : EMPTY_STR);
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if (!$x) {
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return true;
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}
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return false;
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}
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if (preg_match('/(.*?)$/', $s, $matches)) {
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$x = ((array_key_exists(trim($matches[1]),$item)) ? $item[trim($matches[1])] : EMPTY_STR);
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if ($x) {
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return true;
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}
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return false;
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}
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return false;
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}
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}
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