streams/Zotlabs/Lib/MessageFilter.php

<?php

namespace Zotlabs\Lib;


class MessageFilter
{


    public static function evaluate($item, $incl, $excl)
    {

        require_once('include/html2plain.php');

		$text = prepare_text($item['body'],((isset($item['mimetype'])) ? $item['mimetype'] : 'text/x-multicode'));
        $text = html2plain(($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);

        // exclude always has priority

        $exclude = (($excl) ? explode("\n", $excl) : null);

        if ($exclude) {
            foreach ($exclude as $word) {
                $word = trim($word);
                if (! $word) {
                    continue;
                }
                if (substr($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($word, 1) === '*'))) {
                            return false;
                        }
                    }
                } elseif ((strpos($word, '/') === 0) && preg_match($word, $text)) {
                    return false;
                } elseif ((strpos($word, 'lang=') === 0) && ($lang) && (strcasecmp($lang, trim(substr($word, 5))) == 0)) {
                    return false;
                } elseif ((strpos($word, 'lang!=') === 0) && ($lang) && (strcasecmp($lang, trim(substr($word, 6))) != 0)) {
                    return false;
                } elseif (stristr($text, $word) !== false) {
                    return false;
                }
            }
        }

        $include = (($incl) ? explode("\n", $incl) : null);

        if ($include) {
            foreach ($include as $word) {
                $word = trim($word);
                if (! $word) {
                    continue;
                }
                if (substr($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($word, 1) === '*'))) {
                            return true;
                        }
                    }
                } elseif ((strpos($word, '/') === 0) && preg_match($word, $text)) {
                    return true;
                } elseif ((strpos($word, 'lang=') === 0) && ($lang) && (strcasecmp($lang, trim(substr($word, 5))) == 0)) {
                    return true;
                } elseif ((strpos($word, 'lang!=') === 0) && ($lang) && (strcasecmp($lang, trim(substr($word, 6))) != 0)) {
                    return true;
                } elseif (stristr($text, $word) !== false) {
                    return true;
                }
            }
        } else {
            return true;
        }

        return false;
    }
}