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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.
*/
/**
* An abstract base MIME Header.
*
* @author Chris Corbyn
*/
abstract class Swift_Mime_Headers_AbstractHeader implements Swift_Mime_Header
{
const PHRASE_PATTERN = '(?:(?:(?:(?:(?:(?:(?:[ \t]*(?:\r\n))?[ \t])?(\((?:(?:(?:[ \t]*(?:\r\n))?[ \t])|(?:(?:[\x01-\x08\x0B\x0C\x0E-\x19\x7F]|[\x21-\x27\x2A-\x5B\x5D-\x7E])|(?:\\[\x00-\x08\x0B\x0C\x0E-\x7F])|(?1)))*(?:(?:[ \t]*(?:\r\n))?[ \t])?\)))*(?:(?:(?:(?:[ \t]*(?:\r\n))?[ \t])?(\((?:(?:(?:[ \t]*(?:\r\n))?[ \t])|(?:(?:[\x01-\x08\x0B\x0C\x0E-\x19\x7F]|[\x21-\x27\x2A-\x5B\x5D-\x7E])|(?:\\[\x00-\x08\x0B\x0C\x0E-\x7F])|(?1)))*(?:(?:[ \t]*(?:\r\n))?[ \t])?\)))|(?:(?:[ \t]*(?:\r\n))?[ \t])))?[a-zA-Z0-9!#\$%&\'\*\+\-\/=\?\^_`\{\}\|~]+(?:(?:(?:(?:[ \t]*(?:\r\n))?[ \t])?(\((?:(?:(?:[ \t]*(?:\r\n))?[ \t])|(?:(?:[\x01-\x08\x0B\x0C\x0E-\x19\x7F]|[\x21-\x27\x2A-\x5B\x5D-\x7E])|(?:\\[\x00-\x08\x0B\x0C\x0E-\x7F])|(?1)))*(?:(?:[ \t]*(?:\r\n))?[ \t])?\)))*(?:(?:(?:(?:[ \t]*(?:\r\n))?[ \t])?(\((?:(?:(?:[ \t]*(?:\r\n))?[ \t])|(?:(?:[\x01-\x08\x0B\x0C\x0E-\x19\x7F]|[\x21-\x27\x2A-\x5B\x5D-\x7E])|(?:\\[\x00-\x08\x0B\x0C\x0E-\x7F])|(?1)))*(?:(?:[ \t]*(?:\r\n))?[ \t])?\)))|(?:(?:[ \t]*(?:\r\n))?[ \t])))?)|(?:(?:(?:(?:(?:[ \t]*(?:\r\n))?[ \t])?(\((?:(?:(?:[ \t]*(?:\r\n))?[ \t])|(?:(?:[\x01-\x08\x0B\x0C\x0E-\x19\x7F]|[\x21-\x27\x2A-\x5B\x5D-\x7E])|(?:\\[\x00-\x08\x0B\x0C\x0E-\x7F])|(?1)))*(?:(?:[ \t]*(?:\r\n))?[ \t])?\)))*(?:(?:(?:(?:[ \t]*(?:\r\n))?[ \t])?(\((?:(?:(?:[ \t]*(?:\r\n))?[ \t])|(?:(?:[\x01-\x08\x0B\x0C\x0E-\x19\x7F]|[\x21-\x27\x2A-\x5B\x5D-\x7E])|(?:\\[\x00-\x08\x0B\x0C\x0E-\x7F])|(?1)))*(?:(?:[ \t]*(?:\r\n))?[ \t])?\)))|(?:(?:[ \t]*(?:\r\n))?[ \t])))?"((?:(?:[ \t]*(?:\r\n))?[ \t])?(?:(?:[\x01-\x08\x0B\x0C\x0E-\x19\x7F]|[\x21\x23-\x5B\x5D-\x7E])|(?:\\[\x00-\x08\x0B\x0C\x0E-\x7F])))*(?:(?:[ \t]*(?:\r\n))?[ \t])?"(?:(?:(?:(?:[ \t]*(?:\r\n))?[ \t])?(\((?:(?:(?:[ \t]*(?:\r\n))?[ \t])|(?:(?:[\x01-\x08\x0B\x0C\x0E-\x19\x7F]|[\x21-\x27\x2A-\x5B\x5D-\x7E])|(?:\\[\x00-\x08\x0B\x0C\x0E-\x7F])|(?1)))*(?:(?:[ \t]*(?:\r\n))?[ \t])?\)))*(?:(?:(?:(?:[ \t]*(?:\r\n))?[ \t])?(\((?:(?:(?:[ \t]*(?:\r\n))?[ \t])|(?:(?:[\x01-\x08\x0B\x0C\x0E-\x19\x7F]|[\x21-\x27\x2A-\x5B\x5D-\x7E])|(?:\\[\x00-\x08\x0B\x0C\x0E-\x7F])|(?1)))*(?:(?:[ \t]*(?:\r\n))?[ \t])?\)))|(?:(?:[ \t]*(?:\r\n))?[ \t])))?))+?)';
/**
* The name of this Header.
*
* @var string
*/
private $name;
/**
* The Encoder used to encode this Header.
*
* @var Swift_Encoder
*/
private $encoder;
/**
* The maximum length of a line in the header.
*
* @var int
*/
private $lineLength = 78;
/**
* The language used in this Header.
*
* @var string
*/
private $lang;
/**
* The character set of the text in this Header.
*
* @var string
*/
private $charset = 'utf-8';
/**
* The value of this Header, cached.
*
* @var string
*/
private $cachedValue = null;
/**
* Set the character set used in this Header.
*
* @param string $charset
*/
public function setCharset($charset)
{
$this->clearCachedValueIf($charset != $this->charset);
$this->charset = $charset;
if (isset($this->encoder)) {
$this->encoder->charsetChanged($charset);
}
}
/**
* Get the character set used in this Header.
*
* @return string
*/
public function getCharset()
{
return $this->charset;
}
/**
* Set the language used in this Header.
*
* For example, for US English, 'en-us'.
* This can be unspecified.
*
* @param string $lang
*/
public function setLanguage($lang)
{
$this->clearCachedValueIf($this->lang != $lang);
$this->lang = $lang;
}
/**
* Get the language used in this Header.
*
* @return string
*/
public function getLanguage()
{
return $this->lang;
}
/**
* Set the encoder used for encoding the header.
*/
public function setEncoder(Swift_Mime_HeaderEncoder $encoder)
{
$this->encoder = $encoder;
$this->setCachedValue(null);
}
/**
* Get the encoder used for encoding this Header.
*
* @return Swift_Mime_HeaderEncoder
*/
public function getEncoder()
{
return $this->encoder;
}
/**
* Get the name of this header (e.g. charset).
*
* @return string
*/
public function getFieldName()
{
return $this->name;
}
/**
* Set the maximum length of lines in the header (excluding EOL).
*
* @param int $lineLength
*/
public function setMaxLineLength($lineLength)
{
$this->clearCachedValueIf($this->lineLength != $lineLength);
$this->lineLength = $lineLength;
}
/**
* Get the maximum permitted length of lines in this Header.
*
* @return int
*/
public function getMaxLineLength()
{
return $this->lineLength;
}
/**
* Get this Header rendered as a RFC 2822 compliant string.
*
* @return string
*
* @throws Swift_RfcComplianceException
*/
public function toString()
{
return $this->tokensToString($this->toTokens());
}
/**
* Returns a string representation of this object.
*
* @return string
*
* @see toString()
*/
public function __toString()
{
return $this->toString();
}
/**
* Set the name of this Header field.
*
* @param string $name
*/
protected function setFieldName($name)
{
$this->name = $name;
}
/**
* Produces a compliant, formatted RFC 2822 'phrase' based on the string given.
*
* @param string $string as displayed
* @param string $charset of the text
* @param bool $shorten the first line to make remove for header name
*
* @return string
*/
protected function createPhrase(Swift_Mime_Header $header, $string, $charset, Swift_Mime_HeaderEncoder $encoder = null, $shorten = false)
{
// Treat token as exactly what was given
$phraseStr = $string;
// If it's not valid
if (!preg_match('/^'.self::PHRASE_PATTERN.'$/D', $phraseStr)) {
// .. but it is just ascii text, try escaping some characters
// and make it a quoted-string
if (preg_match('/^[\x00-\x08\x0B\x0C\x0E-\x7F]*$/D', $phraseStr)) {
$phraseStr = $this->escapeSpecials($phraseStr, ['"']);
$phraseStr = '"'.$phraseStr.'"';
} else {
// ... otherwise it needs encoding
// Determine space remaining on line if first line
if ($shorten) {
$usedLength = \strlen($header->getFieldName().': ');
} else {
$usedLength = 0;
}
$phraseStr = $this->encodeWords($header, $string, $usedLength);
}
}
return $phraseStr;
}
/**
* Escape special characters in a string (convert to quoted-pairs).
*
* @param string $token
* @param string[] $include additional chars to escape
*
* @return string
*/
private function escapeSpecials($token, $include = [])
{
foreach (array_merge(['\\'], $include) as $char) {
$token = str_replace($char, '\\'.$char, $token);
}
return $token;
}
/**
* Encode needed word tokens within a string of input.
*
* @param string $input
* @param string $usedLength optional
*
* @return string
*/
protected function encodeWords(Swift_Mime_Header $header, $input, $usedLength = -1)
{
$value = '';
$tokens = $this->getEncodableWordTokens($input);
foreach ($tokens as $token) {
// See RFC 2822, Sect 2.2 (really 2.2 ??)
if ($this->tokenNeedsEncoding($token)) {
// Don't encode starting WSP
$firstChar = substr($token, 0, 1);
switch ($firstChar) {
case ' ':
case "\t":
$value .= $firstChar;
$token = substr($token, 1);
}
if (-1 == $usedLength) {
$usedLength = \strlen($header->getFieldName().': ') + \strlen($value);
}
$value .= $this->getTokenAsEncodedWord($token, $usedLength);
$header->setMaxLineLength(76); // Forcefully override
} else {
$value .= $token;
}
}
return $value;
}
/**
* Test if a token needs to be encoded or not.
*
* @param string $token
*
* @return bool
*/
protected function tokenNeedsEncoding($token)
{
return preg_match('~[\x00-\x08\x10-\x19\x7F-\xFF\r\n]~', $token);
}
/**
* Splits a string into tokens in blocks of words which can be encoded quickly.
*
* @param string $string
*
* @return string[]
*/
protected function getEncodableWordTokens($string)
{
$tokens = [];
$encodedToken = '';
// Split at all whitespace boundaries
foreach (preg_split('~(?=[\t ])~', $string ?? '') as $token) {
if ($this->tokenNeedsEncoding($token)) {
$encodedToken .= $token;
} else {
if (\strlen($encodedToken) > 0) {
$tokens[] = $encodedToken;
$encodedToken = '';
}
$tokens[] = $token;
}
}
if (\strlen($encodedToken)) {
$tokens[] = $encodedToken;
}
return $tokens;
}
/**
* Get a token as an encoded word for safe insertion into headers.
*
* @param string $token token to encode
* @param int $firstLineOffset optional
*
* @return string
*/
protected function getTokenAsEncodedWord($token, $firstLineOffset = 0)
{
// Adjust $firstLineOffset to account for space needed for syntax
$charsetDecl = $this->charset;
if (isset($this->lang)) {
$charsetDecl .= '*'.$this->lang;
}
$encodingWrapperLength = \strlen(
'=?'.$charsetDecl.'?'.$this->encoder->getName().'??='
);
if ($firstLineOffset >= 75) {
//Does this logic need to be here?
$firstLineOffset = 0;
}
$encodedTextLines = explode("\r\n",
$this->encoder->encodeString(
$token, $firstLineOffset, 75 - $encodingWrapperLength, $this->charset
) ?? ''
);
if ('iso-2022-jp' !== strtolower($this->charset ?? '')) {
// special encoding for iso-2022-jp using mb_encode_mimeheader
foreach ($encodedTextLines as $lineNum => $line) {
$encodedTextLines[$lineNum] = '=?'.$charsetDecl.
'?'.$this->encoder->getName().
'?'.$line.'?=';
}
}
return implode("\r\n ", $encodedTextLines);
}
/**
* Generates tokens from the given string which include CRLF as individual tokens.
*
* @param string $token
*
* @return string[]
*/
protected function generateTokenLines($token)
{
return preg_split('~(\r\n)~', $token ?? '', -1, PREG_SPLIT_DELIM_CAPTURE);
}
/**
* Set a value into the cache.
*
* @param string $value
*/
protected function setCachedValue($value)
{
$this->cachedValue = $value;
}
/**
* Get the value in the cache.
*
* @return string
*/
protected function getCachedValue()
{
return $this->cachedValue;
}
/**
* Clear the cached value if $condition is met.
*
* @param bool $condition
*/
protected function clearCachedValueIf($condition)
{
if ($condition) {
$this->setCachedValue(null);
}
}
/**
* Generate a list of all tokens in the final header.
*
* @param string $string The string to tokenize
*
* @return array An array of tokens as strings
*/
protected function toTokens($string = null)
{
if (null === $string) {
$string = $this->getFieldBody();
}
$tokens = [];
// Generate atoms; split at all invisible boundaries followed by WSP
foreach (preg_split('~(?=[ \t])~', $string ?? '') as $token) {
$newTokens = $this->generateTokenLines($token);
foreach ($newTokens as $newToken) {
$tokens[] = $newToken;
}
}
return $tokens;
}
/**
* Takes an array of tokens which appear in the header and turns them into
* an RFC 2822 compliant string, adding FWSP where needed.
*
* @param string[] $tokens
*
* @return string
*/
private function tokensToString(array $tokens)
{
$lineCount = 0;
$headerLines = [];
$headerLines[] = $this->name.': ';
$currentLine = &$headerLines[$lineCount++];
// Build all tokens back into compliant header
foreach ($tokens as $i => $token) {
// Line longer than specified maximum or token was just a new line
if (("\r\n" == $token) ||
($i > 0 && \strlen($currentLine.$token) > $this->lineLength)
&& 0 < \strlen($currentLine)) {
$headerLines[] = '';
$currentLine = &$headerLines[$lineCount++];
}
// Append token to the line
if ("\r\n" != $token) {
$currentLine .= $token;
}
}
// Implode with FWS (RFC 2822, 2.2.3)
return implode("\r\n", $headerLines)."\r\n";
}
/**
* Make a deep copy of object.
*/
public function __clone()
{
if ($this->encoder) {
$this->encoder = clone $this->encoder;
}
}
}