enhanced content filters

1 files changed, 171 insertions, 43 deletions

diff --git a/Zotlabs/Lib/MessageFilter.php b/Zotlabs/Lib/MessageFilter.php
index 21e6ca26a..95721e7c7 100644
--- a/Zotlabs/Lib/MessageFilter.php
+++ b/Zotlabs/Lib/MessageFilter.php
@@ -2,85 +2,104 @@
 
 namespace Zotlabs\Lib;
 
-
+require_once('include/html2plain.php');
 
 class MessageFilter {
 
+	public static function evaluate($item, $incl, $excl) {
 
-	static public function evaluate($item,$incl,$excl) {
-
-		require_once('include/html2plain.php');
-
-		$text = prepare_text($item['body'],$item['mimetype']);
+		$text = prepare_text($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)) {
+		if ((strpos($incl, 'lang=') !== false) || (strpos($excl, 'lang=') !== false) || (strpos($incl, 'lang!=') !== false) || (strpos($excl, 'lang!=') !== false)) {
 			$lang = detect_language($text);
 		}
 
-		$tags = ((is_array($item['term']) && count($item['term'])) ? $item['term'] : false);
+		$tags = ((isset($item['term']) && is_array($item['term']) && count($item['term'])) ? $item['term'] : false);
 
 		// exclude always has priority
 
-		$exclude = (($excl) ? explode("\n",$excl) : null);
+		$exclude = (($excl) ? explode("\n", $excl) : null);
 
-		if($exclude) {
-			foreach($exclude as $word) {
+		if ($exclude) {
+			foreach ($exclude as $word) {
 				$word = trim($word);
-				if(! $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($word,1) === '*')))
+				if (substr($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((strpos($word,'/') === 0) && preg_match($word,$text))
+						}
+					}
+				} elseif (substr($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, $text)) {
 					return false;
-				elseif((strpos($word,'lang=') === 0) && ($lang) && (strcasecmp($lang,trim(substr($word,5))) == 0))
+				} elseif ((strpos($word, 'lang=') === 0) && ($lang) && (strcasecmp($lang, trim(substr($word, 5))) == 0)) {
 					return false;
-				elseif((strpos($word,'lang!=') === 0) && ($lang) && (strcasecmp($lang,trim(substr($word,6))) != 0))
+				} elseif ((strpos($word, 'lang!=') === 0) && ($lang) && (strcasecmp($lang, trim(substr($word, 6))) != 0)) {
 					return false;
-				elseif(stristr($text,$word) !== false)
+				} elseif (stristr($text, $word) !== false) {
 					return false;
+				}
 			}
 		}
 
-		$include = (($incl) ? explode("\n",$incl) : null);
+		$include = (($incl) ? explode("\n", $incl) : null);
 
-		if($include) {
-			foreach($include as $word) {
+		if ($include) {
+			foreach ($include as $word) {
 				$word = trim($word);
-				if(! $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($word,1) === '*')))
+				if (substr($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((strpos($word,'/') === 0) && preg_match($word,$text))
+						}
+					}
+				} elseif (substr($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, $text)) {
 					return true;
-				elseif((strpos($word,'lang=') === 0) && ($lang) && (strcasecmp($lang,trim(substr($word,5))) == 0))
+				} elseif ((strpos($word, 'lang=') === 0) && ($lang) && (strcasecmp($lang, trim(substr($word, 5))) == 0)) {
 					return true;
-				elseif((strpos($word,'lang!=') === 0) && ($lang) && (strcasecmp($lang,trim(substr($word,6))) != 0))
+				} elseif ((strpos($word, 'lang!=') === 0) && ($lang) && (strcasecmp($lang, trim(substr($word, 6))) != 0)) {
 					return true;
-				elseif(stristr($text,$word) !== false)
+				} elseif (stristr($text, $word) !== false) {
 					return true;
+				}
 			}
-		}
-		else {
+		} else {
 			return true;
 		}
 
@@ -88,4 +107,113 @@ class MessageFilter {
 	}
 
 
+	/**
+	 * @brief Test for Conditional Execution conditions. Shamelessly ripped off from Code/Render/Comanche
+	 *
+	 * This is extensible. The first version of variable testing supports tests of the forms:
+	 *
+	 * - ?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;
+	 *
+	 * The values 0, '', an empty array, and an unset value will all evaluate to false.
+	 *
+	 * @param string $s
+	 * @param array $item
+	 * @return bool
+	 */
+
+	public static function test_condition($s,$item) {
+
+		if (preg_match('/(.*?)\s\~\=\s(.*?)$/', $s, $matches)) {
+			$x = ((array_key_exists(trim($matches[1]),$item)) ? $item[trim($matches[1])] : EMPTY_STR);
+			if (stripos($x, trim($matches[2])) !== false) {
+				return true;
+			}
+			return false;
+		}
+
+		if (preg_match('/(.*?)\s\=\=\s(.*?)$/', $s, $matches)) {
+			$x = ((array_key_exists(trim($matches[1]),$item)) ? $item[trim($matches[1])] : EMPTY_STR);
+			if ($x == trim($matches[2])) {
+				return true;
+			}
+			return false;
+		}
+
+		if (preg_match('/(.*?)\s\!\=\s(.*?)$/', $s, $matches)) {
+			$x = ((array_key_exists(trim($matches[1]),$item)) ? $item[trim($matches[1])] : EMPTY_STR);
+			if ($x != trim($matches[2])) {
+				return true;
+			}
+			return false;
+		}
+
+		if (preg_match('/(.*?)\s\>\=\s(.*?)$/', $s, $matches)) {
+			$x = ((array_key_exists(trim($matches[1]),$item)) ? $item[trim($matches[1])] : EMPTY_STR);
+			if ($x >= trim($matches[2])) {
+				return true;
+			}
+			return false;
+		}
+
+		if (preg_match('/(.*?)\s\<\=\s(.*?)$/', $s, $matches)) {
+			$x = ((array_key_exists(trim($matches[1]),$item)) ? $item[trim($matches[1])] : EMPTY_STR);
+			if ($x <= trim($matches[2])) {
+				return true;
+			}
+			return false;
+		}
+
+		if (preg_match('/(.*?)\s\>\s(.*?)$/', $s, $matches)) {
+			$x = ((array_key_exists(trim($matches[1]),$item)) ? $item[trim($matches[1])] : EMPTY_STR);
+			if ($x > trim($matches[2])) {
+				return true;
+			}
+			return false;
+		}
+
+		if (preg_match('/(.*?)\s\>\s(.*?)$/', $s, $matches)) {
+			$x = ((array_key_exists(trim($matches[1]),$item)) ? $item[trim($matches[1])] : EMPTY_STR);
+			if ($x < trim($matches[2])) {
+				return true;
+			}
+			return false;
+		}
+
+		if (preg_match('/[\$](.*?)\s\{\}\s(.*?)$/', $s, $matches)) {
+			$x = ((array_key_exists(trim($matches[1]),$item)) ? $item[trim($matches[1])] : EMPTY_STR);
+			if (is_array($x) && in_array(trim($matches[2]), $x)) {
+				return true;
+			}
+			return false;
+		}
+
+		if (preg_match('/(.*?)\s\{\*\}\s(.*?)$/', $s, $matches)) {
+			$x = ((array_key_exists(trim($matches[1]),$item)) ? $item[trim($matches[1])] : EMPTY_STR);
+			if (is_array($x) && array_key_exists(trim($matches[2]), $x)) {
+				return true;
+			}
+			return false;
+		}
+
+		if (preg_match('/(.*?)$/', $s, $matches)) {
+			$x = ((array_key_exists(trim($matches[1]),$item)) ? $item[trim($matches[1])] : EMPTY_STR);
+			if ($x) {
+				return true;
+			}
+			return false;
+		}
+
+		return false;
+	}
+
 }