clean(); * * What this does: * 1. extracts code blocks and privately escapes them from processing * 2. Run html purifier on the content * 3. put back the code blocks * 4. run htmlspecialchars on the entire content for safe storage * * At render time: * $markdown = \Zotlabs\Lib\MarkdownSoap::unescape($text); * $html = \Michelf\MarkdownExtra::DefaultTransform($markdown); */ class MarkdownSoap { private $token; private $str; function __construct($s) { $this->str = $s; $this->token = random_string(20); } function clean() { $x = $this->extract_code($this->str); $x = $this->purify($x); $x = $this->putback_code($x); $x = $this->escape($x); return $x; } function extract_code($s) { $text = preg_replace_callback('{ (?:\n\n|\A\n?) ( # $1 = the code block -- one or more lines, starting with a space/tab (?> [ ]{'.'4'.'} # Lines must start with a tab or a tab-width of spaces .*\n+ )+ ) ((?=^[ ]{0,'.'4'.'}\S)|\Z) # Lookahead for non-space at line-start, or end of doc }xm', [ $this , 'encode_code' ], $s); return $text; } function encode_code($matches) { return $this->token . ';' . base64_encode($matches[0]) . ';' ; } function decode_code($matches) { return base64_decode($matches[1]); } function putback_code($s) { $text = preg_replace_callback('{' . $this->token . '\;(.*?)\;}xm',[ $this, 'decode_code' ], $s); return $text; } function purify($s) { $s = str_replace("\n",'
',$s); $s = str_replace("\t",'    ',$s); $s = str_replace(' ',' ',$s); $s = purify_html($s); $s = str_replace(' '," ",$s); $s = str_replace(['
','
'],["\n","\n"],$s); return $s; } function escape($s) { return htmlspecialchars($s,ENT_QUOTES); } static public function unescape($s) { return htmlspecialchars_decode($s,ENT_QUOTES); } }