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<?php
/*
* This file is part of SwiftMailer.
* (c) 2004-2009 Chris Corbyn
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
/**
* Defines the grammar to use for validation, implements the RFC 2822 (and friends) ABNF grammar definitions.
*
* @author Fabien Potencier
* @author Chris Corbyn
*/
class Swift_Mime_Grammar
{
/**
* Special characters used in the syntax which need to be escaped.
*
* @var string[]
*/
private static $_specials = array();
/**
* Tokens defined in RFC 2822 (and some related RFCs).
*
* @var string[]
*/
private static $_grammar = array();
/**
* Initialize some RFC 2822 (and friends) ABNF grammar definitions.
*/
public function __construct()
{
$this->init();
}
public function __wakeup()
{
$this->init();
}
protected function init()
{
if (count(self::$_specials) > 0) {
return;
}
self::$_specials = array(
'(', ')', '<', '>', '[', ']',
':', ';', '@', ',', '.', '"'
);
/*** Refer to RFC 2822 for ABNF grammar ***/
// All basic building blocks
self::$_grammar['NO-WS-CTL'] = '[\x01-\x08\x0B\x0C\x0E-\x19\x7F]';
self::$_grammar['WSP'] = '[ \t]';
self::$_grammar['CRLF'] = '(?:\r\n)';
self::$_grammar['FWS'] = '(?:(?:' . self::$_grammar['WSP'] . '*' .
self::$_grammar['CRLF'] . ')?' . self::$_grammar['WSP'] . ')';
self::$_grammar['text'] = '[\x00-\x08\x0B\x0C\x0E-\x7F]';
self::$_grammar['quoted-pair'] = '(?:\\\\' . self::$_grammar['text'] . ')';
self::$_grammar['ctext'] = '(?:' . self::$_grammar['NO-WS-CTL'] .
'|[\x21-\x27\x2A-\x5B\x5D-\x7E])';
// Uses recursive PCRE (?1) -- could be a weak point??
self::$_grammar['ccontent'] = '(?:' . self::$_grammar['ctext'] . '|' .
self::$_grammar['quoted-pair'] . '|(?1))';
self::$_grammar['comment'] = '(\((?:' . self::$_grammar['FWS'] . '|' .
self::$_grammar['ccontent']. ')*' . self::$_grammar['FWS'] . '?\))';
self::$_grammar['CFWS'] = '(?:(?:' . self::$_grammar['FWS'] . '?' .
self::$_grammar['comment'] . ')*(?:(?:' . self::$_grammar['FWS'] . '?' .
self::$_grammar['comment'] . ')|' . self::$_grammar['FWS'] . '))';
self::$_grammar['qtext'] = '(?:' . self::$_grammar['NO-WS-CTL'] .
'|[\x21\x23-\x5B\x5D-\x7E])';
self::$_grammar['qcontent'] = '(?:' . self::$_grammar['qtext'] . '|' .
self::$_grammar['quoted-pair'] . ')';
self::$_grammar['quoted-string'] = '(?:' . self::$_grammar['CFWS'] . '?"' .
'(' . self::$_grammar['FWS'] . '?' . self::$_grammar['qcontent'] . ')*' .
self::$_grammar['FWS'] . '?"' . self::$_grammar['CFWS'] . '?)';
self::$_grammar['atext'] = '[a-zA-Z0-9!#\$%&\'\*\+\-\/=\?\^_`\{\}\|~]';
self::$_grammar['atom'] = '(?:' . self::$_grammar['CFWS'] . '?' .
self::$_grammar['atext'] . '+' . self::$_grammar['CFWS'] . '?)';
self::$_grammar['dot-atom-text'] = '(?:' . self::$_grammar['atext'] . '+' .
'(\.' . self::$_grammar['atext'] . '+)*)';
self::$_grammar['dot-atom'] = '(?:' . self::$_grammar['CFWS'] . '?' .
self::$_grammar['dot-atom-text'] . '+' . self::$_grammar['CFWS'] . '?)';
self::$_grammar['word'] = '(?:' . self::$_grammar['atom'] . '|' .
self::$_grammar['quoted-string'] . ')';
self::$_grammar['phrase'] = '(?:' . self::$_grammar['word'] . '+?)';
self::$_grammar['no-fold-quote'] = '(?:"(?:' . self::$_grammar['qtext'] .
'|' . self::$_grammar['quoted-pair'] . ')*")';
self::$_grammar['dtext'] = '(?:' . self::$_grammar['NO-WS-CTL'] .
'|[\x21-\x5A\x5E-\x7E])';
self::$_grammar['no-fold-literal'] = '(?:\[(?:' . self::$_grammar['dtext'] .
'|' . self::$_grammar['quoted-pair'] . ')*\])';
// Message IDs
self::$_grammar['id-left'] = '(?:' . self::$_grammar['dot-atom-text'] . '|' .
self::$_grammar['no-fold-quote'] . ')';
self::$_grammar['id-right'] = '(?:' . self::$_grammar['dot-atom-text'] . '|' .
self::$_grammar['no-fold-literal'] . ')';
// Addresses, mailboxes and paths
self::$_grammar['local-part'] = '(?:' . self::$_grammar['dot-atom'] . '|' .
self::$_grammar['quoted-string'] . ')';
self::$_grammar['dcontent'] = '(?:' . self::$_grammar['dtext'] . '|' .
self::$_grammar['quoted-pair'] . ')';
self::$_grammar['domain-literal'] = '(?:' . self::$_grammar['CFWS'] . '?\[(' .
self::$_grammar['FWS'] . '?' . self::$_grammar['dcontent'] . ')*?' .
self::$_grammar['FWS'] . '?\]' . self::$_grammar['CFWS'] . '?)';
self::$_grammar['domain'] = '(?:' . self::$_grammar['dot-atom'] . '|' .
self::$_grammar['domain-literal'] . ')';
self::$_grammar['addr-spec'] = '(?:' . self::$_grammar['local-part'] . '@' .
self::$_grammar['domain'] . ')';
}
/**
* Get the grammar defined for $name token.
*
* @param string $name exactly as written in the RFC
*
* @return string
*/
public function getDefinition($name)
{
if (array_key_exists($name, self::$_grammar)) {
return self::$_grammar[$name];
} else {
throw new Swift_RfcComplianceException(
"No such grammar '" . $name . "' defined."
);
}
}
/**
* Returns the tokens defined in RFC 2822 (and some related RFCs).
*
* @return array
*/
public function getGrammarDefinitions()
{
return self::$_grammar;
}
/**
* Returns the current special characters used in the syntax which need to be escaped.
*
* @return array
*/
public function getSpecials()
{
return self::$_specials;
}
/**
* Escape special characters in a string (convert to quoted-pairs).
*
* @param string $token
* @param string[] $include additional chars to escape
* @param string[] $exclude chars from escaping
*
* @return string
*/
public function escapeSpecials($token, $include = array(), $exclude = array())
{
foreach (array_merge(array('\\'), array_diff(self::$_specials, $exclude), $include) as $char) {
$token = str_replace($char, '\\' . $char, $token);
}
return $token;
}
}
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