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vendor/symfony/mime/Crypto/SMime.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\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;
+    }
+}