Laravel Logging to Slack via a Proxy

I have configured my Laravel app running the Laravel 5.7.5 PHP Framework to send error notifications to a Slack channel. A snippet of my config/logging.php file looks as follows:

'channels' => [
    'stack' => [
        'driver' => 'stack',
        'channels' => (env('APP_ENV') == 'production') ? ['single', 'slack'] : ['single'],
    ],

    'single' => [
        'driver' => 'single',
        'path' => storage_path('logs/laravel.log'),
        'level' => 'debug',
    ],

    'daily' => [
        'driver' => 'daily',
        'path' => storage_path('logs/laravel.log'),
        'level' => 'debug',
        'days' => 7,
    ],

    'slack' => [
        'driver' => 'slack',
        'url' => env('LOG_SLACK_WEBHOOK_URL'),
        'username' => 'Laravel Log',
        'emoji' => ':boom:',
        'level' => 'error',
    ],

This works fine when I'm connected to the public internet (not via a proxy server), but my production servers need to send the requests via a Squid proxy server, and the requests are timing out.

How do I go about specifying a proxy server for the Slack Webhook to ensure that my requests are routed through the proxy server and get sent to the Slack API?

Solution

I understand that quite a lot of time has passed, but I ran into a similar problem, perhaps the material found may be useful to someone.

Judging by the source code of the library https://github.com/Seldaek/monolog/blob/master/src/Monolog/Handler/SlackWebhookHandler.php

Currently, the current implementation cannot specify a proxy.

But you can define a custom-type logger. Here in this article is written in detail how to do it. https://medium.com/binarcode/laravel-5-6-custom-monolog-channel-to-store-logs-in-mariadb-23da52f537e7

I did it like this:

//config/logging.php
'default' => env('LOG_CHANNEL', 'custom'),
....
'custom' => [
        'driver' => 'custom',
        'via' => App\Extensions\SlackCustomLogger::class,
        'level' => 'debug',
        'url' => env('SLACK_WEBHOOK_URL'),
        'username' => 'Laravel Log',
        'emoji' => ':boom:',
    ],
...

<?php

namespace App\Extensions;

use Monolog\Logger;

class SlackCustomLogger
{
    /**
     * Create a custom Monolog instance.
     *
     * @param  array  $config
     * @return \Monolog\Logger
     */
    public function __invoke(array $config)
    {
        $logger = new Logger('custom');
        $logger->pushHandler(new CustomSlackLogHandler(
            $config['url'],
            $config['channel'] ?? null,
            $config['username'] ?? 'Laravel',
            $config['attachment'] ?? true,
            $config['emoji'] ?? ':boom:',
            $config['short'] ?? false,
            $config['context'] ?? true,
            $config['level'] ?? 'debug'
        ));
        return $logger;
    }
}

<?php

namespace App\Extensions;


use Monolog\Handler\Curl\Util;
use Monolog\Handler\SlackWebhookHandler;

class CustomSlackLogHandler extends SlackWebhookHandler
{
    protected function write(array $record)
    {
        $postData = $this->getSlackRecord()->getSlackData($record);
        $postString = json_encode($postData);

        $ch = curl_init();
        $options = array(
            CURLOPT_URL => $this->getWebhookUrl(),
            CURLOPT_POST => true,
            CURLOPT_RETURNTRANSFER => true,
            CURLOPT_HTTPHEADER => array('Content-type: application/json'),
            CURLOPT_POSTFIELDS => $postString
        );

        if(getenv('PROXY', false)) {
            $options[CURLOPT_PROXY] = getenv('PROXY');
            curl_setopt($ch, CURLOPT_PROXYPORT, getenv('PROXY_PORT'));
            curl_setopt($ch, CURLOPT_HTTPAUTH, CURLAUTH_BASIC);
            curl_setopt($ch, CURLOPT_PROXYUSERPWD, getenv('PROXY_USERPWD'));
        }

        if (defined('CURLOPT_SAFE_UPLOAD')) {
            $options[CURLOPT_SAFE_UPLOAD] = true;
        }

        curl_setopt_array($ch, $options);

        Util::execute($ch);
    }
}