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<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\Mime\Header;
use Symfony\Component\Mime\Encoder\QpMimeHeaderEncoder;
/**
* An abstract base MIME Header.
*
* @author Chris Corbyn
*/
abstract class AbstractHeader implements HeaderInterface
{
public 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])))?))+?)';
private static QpMimeHeaderEncoder $encoder;
private string $name;
private int $lineLength = 76;
private ?string $lang = null;
private string $charset = 'utf-8';
public function __construct(string $name)
{
$this->name = $name;
}
public function setCharset(string $charset): void
{
$this->charset = $charset;
}
public function getCharset(): ?string
{
return $this->charset;
}
/**
* Set the language used in this Header.
*
* For example, for US English, 'en-us'.
*/
public function setLanguage(string $lang): void
{
$this->lang = $lang;
}
public function getLanguage(): ?string
{
return $this->lang;
}
public function getName(): string
{
return $this->name;
}
public function setMaxLineLength(int $lineLength): void
{
$this->lineLength = $lineLength;
}
public function getMaxLineLength(): int
{
return $this->lineLength;
}
public function toString(): string
{
return $this->tokensToString($this->toTokens());
}
/**
* Produces a compliant, formatted RFC 2822 'phrase' based on the string given.
*
* @param string $string as displayed
* @param bool $shorten the first line to make remove for header name
*/
protected function createPhrase(HeaderInterface $header, string $string, string $charset, bool $shorten = false): string
{
// 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)) {
foreach (['\\', '"'] as $char) {
$phraseStr = str_replace($char, '\\'.$char, $phraseStr);
}
$phraseStr = '"'.$phraseStr.'"';
} else {
// ... otherwise it needs encoding
// Determine space remaining on line if first line
if ($shorten) {
$usedLength = \strlen($header->getName().': ');
} else {
$usedLength = 0;
}
$phraseStr = $this->encodeWords($header, $string, $usedLength);
}
} elseif (str_contains($phraseStr, '(')) {
foreach (['\\', '"'] as $char) {
$phraseStr = str_replace($char, '\\'.$char, $phraseStr);
}
$phraseStr = '"'.$phraseStr.'"';
}
return $phraseStr;
}
/**
* Encode needed word tokens within a string of input.
*/
protected function encodeWords(HeaderInterface $header, string $input, int $usedLength = -1): string
{
$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->getName().': ') + \strlen($value);
}
$value .= $this->getTokenAsEncodedWord($token, $usedLength);
} else {
$value .= $token;
}
}
return $value;
}
protected function tokenNeedsEncoding(string $token): bool
{
return (bool) 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.
*
* @return string[]
*/
protected function getEncodableWordTokens(string $string): array
{
$tokens = [];
$encodedToken = '';
// Split at all whitespace boundaries
foreach (preg_split('~(?=[\t ])~', $string) as $token) {
if ($this->tokenNeedsEncoding($token)) {
$encodedToken .= $token;
} else {
if ('' !== $encodedToken) {
$tokens[] = $encodedToken;
$encodedToken = '';
}
$tokens[] = $token;
}
}
if ('' !== $encodedToken) {
$tokens[] = $encodedToken;
}
foreach ($tokens as $i => $token) {
// whitespace(s) between 2 encoded tokens
if (
0 < $i
&& isset($tokens[$i + 1])
&& preg_match('~^[\t ]+$~', $token)
&& $this->tokenNeedsEncoding($tokens[$i - 1])
&& $this->tokenNeedsEncoding($tokens[$i + 1])
) {
$tokens[$i - 1] .= $token.$tokens[$i + 1];
array_splice($tokens, $i, 2);
}
}
return $tokens;
}
/**
* Get a token as an encoded word for safe insertion into headers.
*/
protected function getTokenAsEncodedWord(string $token, int $firstLineOffset = 0): string
{
self::$encoder ??= new QpMimeHeaderEncoder();
// Adjust $firstLineOffset to account for space needed for syntax
$charsetDecl = $this->charset;
if (null !== $this->lang) {
$charsetDecl .= '*'.$this->lang;
}
$encodingWrapperLength = \strlen('=?'.$charsetDecl.'?'.self::$encoder->getName().'??=');
if ($firstLineOffset >= 75) {
// Does this logic need to be here?
$firstLineOffset = 0;
}
$encodedTextLines = explode("\r\n",
self::$encoder->encodeString($token, $this->charset, $firstLineOffset, 75 - $encodingWrapperLength)
);
if ('iso-2022-jp' !== strtolower($this->charset)) {
// special encoding for iso-2022-jp using mb_encode_mimeheader
foreach ($encodedTextLines as $lineNum => $line) {
$encodedTextLines[$lineNum] = '=?'.$charsetDecl.'?'.self::$encoder->getName().'?'.$line.'?=';
}
}
return implode("\r\n ", $encodedTextLines);
}
/**
* Generates tokens from the given string which include CRLF as individual tokens.
*
* @return string[]
*/
protected function generateTokenLines(string $token): array
{
return preg_split('~(\r\n)~', $token, -1, \PREG_SPLIT_DELIM_CAPTURE);
}
/**
* Generate a list of all tokens in the final header.
*/
protected function toTokens(?string $string = null): array
{
$string ??= $this->getBodyAsString();
$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
*/
private function tokensToString(array $tokens): string
{
$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)
&& '' !== $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);
}
}