不能捕获SwiftMailer异常？

Question

我正在使用SwiftMailer (独立的)。

下面的代码运行良好，但当我输入无效的SMTP凭据时，会显示一个类似于此的错误，并显示整个堆栈跟踪：

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

样本代码：

<?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();
}

它不应该捕获异常吗？

有什么想法吗？

Answer 1

你可以试着做手册建议的事情：

如果您需要尽早知道身份验证是否失败，是否会引发异常，请调用创建的传输上的start()方法。

因此，生成的代码可以是：

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

更新:经过进一步的分析，我想我明白了。你可能相信你没有抓住例外，但实际上你是。问题是，getMessage()方法在Swift_TransportException上返回完整的堆栈跟踪(至少在使用SwiftMailer 6的env上).在catch块echo "Message start" . $ex->getMessage() . "Message End";中尝试这样做，您应该会看到您添加的文本。

更新2:如果您想要实现的是消除消息中的堆栈跟踪，那么我所能想到的唯一解决方案就是子类Swift_SmtpTransport，更早地捕获异常并抛出一个带有较短消息的新异常。一个可能的解决方案可能是这样的

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，我同意我得出的结论和@gere一样。

令人震惊的是，$ex->getMessage();在其上附加了一个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核心文件中的消息中。如果您决定更新您的SwiftMailer文件，这在将来可能会出现问题，但作为临时修复，假设您的文件结构与我的相同，请导航到(对我来说是第187行)：

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

并定位函数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:我忘了提到，这段代码在每个验证器上进行迭代，这些验证器是在第一次尝试中使用的，并以堆栈跟踪的形式输出他们遇到的错误，这是您正在看到的其他数据。只是为了澄清。

编辑2:这是24天前通过替换第182行来修正的：

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

通过以下方式：

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

如git上的提交消息所示，这里