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