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Filename : AbstractHeader.php
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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;
    }

    /**
     * @return void
     */
    public function setCharset(string $charset)
    {
        $this->charset = $charset;
    }

    public function getCharset(): ?string
    {
        return $this->charset;
    }

    /**
     * Set the language used in this Header.
     *
     * For example, for US English, 'en-us'.
     *
     * @return void
     */
    public function setLanguage(string $lang)
    {
        $this->lang = $lang;
    }

    public function getLanguage(): ?string
    {
        return $this->lang;
    }

    public function getName(): string
    {
        return $this->name;
    }

    /**
     * @return void
     */
    public function setMaxLineLength(int $lineLength)
    {
        $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;
        }

        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);
    }
}