无法捕获 SwiftMailer 异常？

Question

我正在使用 SwiftMailer（独立）。

下面的代码工作正常，但是当我输入无效的 SMTP 凭据时，整个堆栈跟踪都会显示类似这样的错误：

Failed to authenticate on SMTP server with username "MYUSERNAME" using 3 possible authenticators. Authenticator CRAM-MD5 returned Swift_TransportException: Expected response code 235 but got code "535", with message "535 5.7.0 Invalid login or password
" in /var/www/tester/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/AbstractSmtpTransport.php:457
Stack trace:
#0 /var/www/tester/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/AbstractSmtpTransport.php(341): Swift_Transport_AbstractSmtpTransport->assertResponseCode('535 5.7.0 Inval...', Array)
#1 /var/www/tester/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/EsmtpTransport.php(305): Swift_Transport_AbstractSmtpTransport->executeCommand('NmE0ODlmMWNmOTc...', Array, Array, false, NULL)
#2 /var/www/tester/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/Esmtp/Auth/CramMd5Authenticator.php(39): Swift_Transport_EsmtpTransport->executeCommand('NmE0ODlmMWNmOTc...', Array)
#3 /var/www/tester/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/Esmtp/AuthHandler.php(177): Swift_Transport_Esmtp_Auth_CramMd5Authenticator->authenticate(Object(Swift_SmtpTransport), 'MYUSERNAME', 'MYPASSWORD')
#4 /var/www/tester/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/EsmtpTransport.php(371): Swift_Transport_Esmtp_AuthHandler->afterEhlo(Object(Swift_SmtpTransport))
#5 /var/www/tester/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/AbstractSmtpTransport.php(148): Swift_Transport_EsmtpTransport->doHeloCommand()
#6 /var/www/tester/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Mailer.php(65): Swift_Transport_AbstractSmtpTransport->start()
#7 /var/www/tester/public/index.php(32): Swift_Mailer->send(Object(Swift_Message))
#8 {main}. Authenticator LOGIN returned Swift_TransportException: Expected response code 250 but got an empty response in /var/www/tester/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/AbstractSmtpTransport.php:445
Stack trace:
#0 /var/www/tester/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/AbstractSmtpTransport.php(341): Swift_Transport_AbstractSmtpTransport->assertResponseCode('', Array)
#1 /var/www/tester/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/EsmtpTransport.php(305): Swift_Transport_AbstractSmtpTransport->executeCommand('RSET\r\n', Array, Array, false, NULL)
#2 /var/www/tester/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/Esmtp/Auth/LoginAuthenticator.php(40): Swift_Transport_EsmtpTransport->executeCommand('RSET\r\n', Array)
#3 /var/www/tester/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/Esmtp/AuthHandler.php(177): Swift_Transport_Esmtp_Auth_LoginAuthenticator->authenticate(Object(Swift_SmtpTransport), 'MYUSERNAME', 'MYPASSWORD')
#4 /var/www/tester/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/EsmtpTransport.php(371): Swift_Transport_Esmtp_AuthHandler->afterEhlo(Object(Swift_SmtpTransport))
#5 /var/www/tester/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/AbstractSmtpTransport.php(148): Swift_Transport_EsmtpTransport->doHeloCommand()
#6 /var/www/tester/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Mailer.php(65): Swift_Transport_AbstractSmtpTransport->start()
#7 /var/www/tester/public/index.php(32): Swift_Mailer->send(Object(Swift_Message))
#8 {main}. Authenticator PLAIN returned Swift_TransportException: Expected response code 250 but got an empty response in /var/www/tester/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/AbstractSmtpTransport.php:445
Stack trace:
#0 /var/www/tester/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/AbstractSmtpTransport.php(341): Swift_Transport_AbstractSmtpTransport->assertResponseCode('', Array)
#1 /var/www/tester/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/EsmtpTransport.php(305): Swift_Transport_AbstractSmtpTransport->executeCommand('RSET\r\n', Array, Array, false, NULL)
#2 /var/www/tester/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/Esmtp/Auth/PlainAuthenticator.php(39): Swift_Transport_EsmtpTransport->executeCommand('RSET\r\n', Array)
#3 /var/www/tester/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/Esmtp/AuthHandler.php(177): Swift_Transport_Esmtp_Auth_PlainAuthenticator->authenticate(Object(Swift_SmtpTransport), 'MYUSERNAME', 'MYPASSWORD')
#4 /var/www/tester/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/EsmtpTransport.php(371): Swift_Transport_Esmtp_AuthHandler->afterEhlo(Object(Swift_SmtpTransport))
#5 /var/www/tester/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/AbstractSmtpTransport.php(148): Swift_Transport_EsmtpTransport->doHeloCommand()
#6 /var/www/tester/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Mailer.php(65): Swift_Transport_AbstractSmtpTransport->start()
#7 /var/www/tester/public/index.php(32): Swift_Mailer->send(Object(Swift_Message))
#8 {main}.done

示例代码：

<?php

try {

    $transport = (new Swift_SmtpTransport($host, $port))
        ->setUsername($user)
        ->setPassword($pass);

    $mailer = new \Swift_Mailer($transport);

    $message = (new \Swift_Message('test'))
        ->setFrom(['foo@example.com' => 'bar'])
        ->setTo(['foo@example.com'])
        ->setBody('test');

    $mailer->send($message);

} catch (\Swift_TransportException $ex) {

    echo $ex->getMessage();

} catch (\Exception $ex) {

    echo $ex->getMessage();
}

不是应该捕获异常吗？

有什么想法吗？

Answer 1

您可以尝试按照 the manual 的建议进行操作：

If you need to know early whether or not authentication has failed and an Exception is going to be thrown, call the start() method on the created Transport.

因此生成的代码可能是：

$transport = (new Swift_SmtpTransport($host, $port))
    ->setUsername($user)
    ->setPassword($pass); 
$try {
    $transport->start();
} catch (\Swift_TransportException $ex) {
    echo $ex->getMessage();
    return; //whatever you want to do.
}
....

更新：经过进一步分析，我想我明白了。您可能认为自己没有捕捉到异常，但实际上您捕捉到了。问题是 Swift_TransportException returns 上的 getMessage() 方法完整的堆栈跟踪（至少在我的环境中使用 SwiftMailer 6）...尝试在你的 catch 块中做这样的事情echo "Message start" . $ex->getMessage() . "Message End"; 你应该会看到你添加的文本。

更新 2：如果你想要实现的是摆脱消息中的堆栈跟踪，我能想到的唯一解决方案是子类化 Swift_SmtpTransport，更早地捕获异常并抛出一个新的消息更短的异常。可能的解决方案如下所示

class Better_SwiftSmtpTransport extends  Swift_SmtpTransport
{
    public function __construct(string $host = 'localhost', int $port = 25, ?string $encryption = null)
    {
        parent::__construct($host, $port, $encryption);
    }

    public function start()
    {
        try {
            return parent::start();
        }
        catch (Swift_TransportException $ex) {
            throw new Better_SwiftSmtpTransportException(
                $ex->getMessage(), 
                $ex->getCode(), 
                $ex
            );
        }
    }
}

class Better_SwiftSmtpTransportException extends Swift_TransportException
{
    public function __construct(string $message, int $code = 0, Exception $previous = null)
    {
        $message = strtok($message, "\n"); // get only the first line of the message
        parent::__construct($message, $code, $previous);
    }
}

$transport = (new Better_SwiftSmtpTransport($host, 25))
    ->setUsername($user)
    ->setPassword($password)
;
try {
    $mailer = new \Swift_Mailer($transport);
    $message = (new \Swift_Message('test'))
        ->setFrom(['foo@example.com' => 'bar'])
        ->setTo(['foo@example.com'])
        ->setBody('test');
    $mailer->send($message);

} catch (Swift_TransportException $ex) {
    echo  $ex->getMessage();
}

Answer 2

经过长时间的挖掘，我同意我得出了与@gere 相同的结论。

令人震惊的是，$ex->getMessage(); 附加了一个 stackTrace。

我发现您可以通过注释掉 foreach() 循环来禁用它，该循环将所有这些附加信息添加到 SwiftMailer 核心文件之一的邮件中。如果您决定更新 SwiftMailer 文件但作为临时修复，这在将来可能会出现问题，假设您的文件结构与我的相同，请导航至（对我来说是第 187 行）：

/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/Esmtp/Authhandler.php

并找到函数 public function afterEhlo(Swift_Transport_SmtpAgent $agent)

最后，代码如下所示：

$message = 'Failed to authenticate on SMTP server with username "' . $this->username . '" using ' . $count . ' possible authenticators.';
foreach ($errors as $error) {
    $message .= ' Authenticator ' . $error[0] . ' returned ' . $error[1] . '.';
}

throw new Swift_TransportException($message);

并注释掉 foreach() 循环甚至只是内部表达式：

$message = 'Failed to authenticate on SMTP server with username "' . $this->username . '" using ' . $count . ' possible authenticators.';
/*foreach ($errors as $error) {
    $message .= ' Authenticator ' . $error[0] . ' returned ' . $error[1] . '.';
}*/

throw new Swift_TransportException($message);

编辑：我忘了说，这段代码遍历了身份验证尝试中使用的每个身份验证器，并以堆栈跟踪的形式吐出它们遇到的错误，这是您的附加数据正在看。只是为了澄清。

编辑 2：这是 24 天前通过替换第 182 行修复的：

$errors[] = [$authenticator->getAuthKeyword(), $e];

与：

$errors[] = [$authenticator->getAuthKeyword(), $e->getMessage()];

如 git 上的提交消息所示，here

无法捕获 SwiftMailer 异常？

Can't catch SwiftMailer Exception?

php

exception

swiftmailer