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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\Crypto;
use Symfony\Component\Mime\Exception\RuntimeException;
use Symfony\Component\Mime\Part\SMimePart;
/**
* @author Sebastiaan Stok <s.stok@rollerscapes.net>
*
* @internal
*/
abstract class SMime
{
protected function normalizeFilePath(string $path): string
{
if (!file_exists($path)) {
throw new RuntimeException(sprintf('File does not exist: "%s".', $path));
}
return 'file://'.str_replace('\\', '/', realpath($path));
}
protected function iteratorToFile(iterable $iterator, $stream): void
{
foreach ($iterator as $chunk) {
fwrite($stream, $chunk);
}
}
protected function convertMessageToSMimePart($stream, string $type, string $subtype): SMimePart
{
rewind($stream);
$headers = '';
while (!feof($stream)) {
$buffer = fread($stream, 78);
$headers .= $buffer;
// Detect ending of header list
if (preg_match('/(\r\n\r\n|\n\n)/', $headers, $match)) {
$headersPosEnd = strpos($headers, $headerBodySeparator = $match[0]);
break;
}
}
$headers = $this->getMessageHeaders(trim(substr($headers, 0, $headersPosEnd)));
fseek($stream, $headersPosEnd + \strlen($headerBodySeparator));
return new SMimePart($this->getStreamIterator($stream), $type, $subtype, $this->getParametersFromHeader($headers['content-type']));
}
protected function getStreamIterator($stream): iterable
{
while (!feof($stream)) {
yield str_replace("\n", "\r\n", str_replace("\r\n", "\n", fread($stream, 16372)));
}
}
private function getMessageHeaders(string $headerData): array
{
$headers = [];
$headerLines = explode("\r\n", str_replace("\n", "\r\n", str_replace("\r\n", "\n", $headerData)));
$currentHeaderName = '';
// Transform header lines into an associative array
foreach ($headerLines as $headerLine) {
// Empty lines between headers indicate a new mime-entity
if ('' === $headerLine) {
break;
}
// Handle headers that span multiple lines
if (!str_contains($headerLine, ':')) {
$headers[$currentHeaderName] .= ' '.trim($headerLine);
continue;
}
$header = explode(':', $headerLine, 2);
$currentHeaderName = strtolower($header[0]);
$headers[$currentHeaderName] = trim($header[1]);
}
return $headers;
}
private function getParametersFromHeader(string $header): array
{
$params = [];
preg_match_all('/(?P<name>[a-z-0-9]+)=(?P<value>"[^"]+"|(?:[^\s;]+|$))(?:\s+;)?/i', $header, $matches);
foreach ($matches['value'] as $pos => $paramValue) {
$params[$matches['name'][$pos]] = trim($paramValue, '"');
}
return $params;
}
}
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