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vendor/symfony/mime/Part/AbstractMultipartPart.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\Part;
+
+use Symfony\Component\Mime\Header\Headers;
+
+/**
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+abstract class AbstractMultipartPart extends AbstractPart
+{
+    private ?string $boundary = null;
+    private array $parts = [];
+
+    public function __construct(AbstractPart ...$parts)
+    {
+        parent::__construct();
+
+        foreach ($parts as $part) {
+            $this->parts[] = $part;
+        }
+    }
+
+    /**
+     * @return AbstractPart[]
+     */
+    public function getParts(): array
+    {
+        return $this->parts;
+    }
+
+    public function getMediaType(): string
+    {
+        return 'multipart';
+    }
+
+    public function getPreparedHeaders(): Headers
+    {
+        $headers = parent::getPreparedHeaders();
+        $headers->setHeaderParameter('Content-Type', 'boundary', $this->getBoundary());
+
+        return $headers;
+    }
+
+    public function bodyToString(): string
+    {
+        $parts = $this->getParts();
+        $string = '';
+        foreach ($parts as $part) {
+            $string .= '--'.$this->getBoundary()."\r\n".$part->toString()."\r\n";
+        }
+        $string .= '--'.$this->getBoundary()."--\r\n";
+
+        return $string;
+    }
+
+    public function bodyToIterable(): iterable
+    {
+        $parts = $this->getParts();
+        foreach ($parts as $part) {
+            yield '--'.$this->getBoundary()."\r\n";
+            yield from $part->toIterable();
+            yield "\r\n";
+        }
+        yield '--'.$this->getBoundary()."--\r\n";
+    }
+
+    public function asDebugString(): string
+    {
+        $str = parent::asDebugString();
+        foreach ($this->getParts() as $part) {
+            $lines = explode("\n", $part->asDebugString());
+            $str .= "\n  └ ".array_shift($lines);
+            foreach ($lines as $line) {
+                $str .= "\n  |".$line;
+            }
+        }
+
+        return $str;
+    }
+
+    private function getBoundary(): string
+    {
+        return $this->boundary ??= strtr(base64_encode(random_bytes(6)), '+/', '-_');
+    }
+}