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✏️ Editing: AbstractStream.php

<?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\Mailer\Transport\Smtp\Stream;

use Symfony\Component\Mailer\Exception\TransportException;

/**
 * A stream supporting remote sockets and local processes.
 *
 * @author Fabien Potencier <fabien@symfony.com>
 * @author Nicolas Grekas <p@tchwork.com>
 * @author Chris Corbyn
 *
 * @internal
 */
abstract class AbstractStream
{
    /** @var resource|null */
    protected $stream;
    /** @var resource|null */
    protected $in;
    /** @var resource|null */
    protected $out;
    protected $err;

private string $debug = '';

public function write(string $bytes, bool $debug = true): void
    {
        if ($debug) {
            $timestamp = (new \DateTimeImmutable())->format('Y-m-d\TH:i:s.up');
            foreach (explode("\n", trim($bytes)) as $line) {
                $this->debug .= \sprintf("[%s] > %s\n", $timestamp, $line);
            }
        }

$bytesToWrite = \strlen($bytes);
        $totalBytesWritten = 0;
        while ($totalBytesWritten < $bytesToWrite) {
            $bytesWritten = @fwrite($this->in, substr($bytes, $totalBytesWritten));
            if (false === $bytesWritten || 0 === $bytesWritten) {
                throw new TransportException('Unable to write bytes on the wire.');
            }

$totalBytesWritten += $bytesWritten;
        }
    }

/**
     * Flushes the contents of the stream (empty it) and set the internal pointer to the beginning.
     */
    public function flush(): void
    {
        fflush($this->in);
    }

/**
     * Performs any initialization needed.
     */
    abstract public function initialize(): void;

public function terminate(): void
    {
        $this->stream = $this->err = $this->out = $this->in = null;
    }

public function readLine(): string
    {
        if (feof($this->out)) {
            return '';
        }

$line = @fgets($this->out);
        if ('' === $line || false === $line) {
            if (stream_get_meta_data($this->out)['timed_out']) {
                throw new TransportException(\sprintf('Connection to "%s" timed out.', $this->getReadConnectionDescription()));
            }
            if (feof($this->out)) { // don't use "eof" metadata, it's not accurate on Windows
                throw new TransportException(\sprintf('Connection to "%s" has been closed unexpectedly.', $this->getReadConnectionDescription()));
            }
            if (false === $line) {
                throw new TransportException(\sprintf('Unable to read from connection to "%s": ', $this->getReadConnectionDescription().error_get_last()['message'] ?? ''));
            }
        }

$this->debug .= \sprintf('[%s] < %s', (new \DateTimeImmutable())->format('Y-m-d\TH:i:s.up'), $line);

return $line;
    }

public function getDebug(): string
    {
        $debug = $this->debug;
        $this->debug = '';

return $debug;
    }

public static function replace(string $from, string $to, iterable $chunks): \Generator
    {
        if ('' === $from) {
            yield from $chunks;

return;
        }

$carry = '';
        $fromLen = \strlen($from);

foreach ($chunks as $chunk) {
            if ('' === $chunk = $carry.$chunk) {
                continue;
            }

if (str_contains($chunk, $from)) {
                $chunk = explode($from, $chunk);
                $carry = array_pop($chunk);

yield implode($to, $chunk).$to;
            } else {
                $carry = $chunk;
            }

if (\strlen($carry) > $fromLen) {
                yield substr($carry, 0, -$fromLen);
                $carry = substr($carry, -$fromLen);
            }
        }

if ('' !== $carry) {
            yield $carry;
        }
    }

abstract protected function getReadConnectionDescription(): string;
}

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