脱离Symfony框架单独使用mailer扩展

How to use symfony/mailer and twig without the Symfony Framework

2021 8月19日，Fabien Potenciar正式宣布Swiftmailer的维护结束。Swiftmailer 已被symfony/mailer 包所取代。

背景

想在 tp6.1.1 中使用 mailer 来发送邮件，邮件内容最好是能使用 twig 引擎直接渲染好的模板。（其他框架也可以参考）

实施

根据官方文档安装：Sending Emails with Mailer (Symfony Docs)

安装依赖

composer require symfony/mailer

composer require symfony/twig-bridge

composer require "twig/twig:^3.0"

代码示例

1.控制器

use Symfony\Bridge\Twig\Mime\BodyRenderer;
use Symfony\Component\Mailer\Exception\TransportExceptionInterface;
use Symfony\Component\Mailer\Mailer;
use Symfony\Component\Mailer\Transport;
use Symfony\Component\Mime\Address;
use Symfony\Component\Mime\Email;
use Symfony\Bridge\Twig\Mime\TemplatedEmail;
use Twig\Environment;
use Twig\Loader\FilesystemLoader;

public function sendMail($param)
    {
        // MAILER_DSN=smtp://user:pass@smtp.example.com:port
        $transport = Transport::fromDsn('smtp://user:pass@smtp.example.com:port');
        $mailer = new Mailer($transport);

        // $email = (new Email())
        $email = (new TemplatedEmail())
            ->from(new Address('from@example.com', '邮件发送人'))
            ->to('to@example.com')
            //->cc('cc@example.com')
            //->bcc('bcc@example.com')
            ->subject($subject)
            // ->text('Sending emails is fun again!')
            // ->html('<p>See Twig integration for better HTML integration!</p>')
            // // path of the Twig template to render
            ->htmlTemplate('emails/signup.html.twig')
            // pass variables (name => value) to the template
            ->context([
                'expiration_date' => new \DateTime('+7 days'),
                'username' => 'foo',
            ]);

        // 手动加载模板渲染环境
        $loader = new FilesystemLoader(app_path() . 'path/view/');
        $twig = new Environment($loader);
        $twigBodyRenderer = new BodyRenderer($twig);
        $twigBodyRenderer->render($email);

        // dd($email->toString());

        try {
            $mailer->send($email);
        } catch (TransportExceptionInterface $e) {
            // some error prevented the email sending; display an
            // error message or try to resend the message
            dump($e->getMessage());
        }
    }

2.模板文件

{# templates/emails/signup.html.twig #}
<h1>Welcome {{ email.toName }}!</h1>

<p>
    You signed up as {{ username }} the following email:
</p>
<p><code>{{ email.to[0].address }}</code></p>

<p>
    <a href="#">Click here to activate your account</a>
    (this link is valid until {{ expiration_date|date('F jS') }})
</p>

内嵌图片

由于不在 symfony 框架下使用，可以通过 内嵌 图片设置别名 加 图片 cid 的方式

// 后端
$email->embedFromPath('path/to/images/logo.jpg', 'logo')

// 前端
<img src="cid:logo" width=100 height=40 />

CSS内联样式

composer require twig/cssinliner-extra

可以将 css 样式表自动变为内联样式，兼容更多邮件布局

use Twig\Extra\CssInliner\CssInlinerExtension;

$twig = new \Twig\Environment(...);
$twig->addExtension(new CssInlinerExtension());

模板文件参考官方文档：Sending Emails with Mailer (Symfony Docs)

参考：
https://github.com/symfony/symfony/issues/35990#issuecomment-644532371
How to use symfony/mailer without the Symfony Framework | doeken.org