SlackHandler.php

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<?php

/*
 * This file is part of the Monolog package.
 *
 * (c) Jordi Boggiano <j.boggiano@seld.be>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Monolog\Handler;

use Monolog\Logger;
use Monolog\Formatter\LineFormatter;

class SlackHandler extends SocketHandler
{
    private $token;

    private $channel;

    private $username;

    private $iconEmoji;

    private $useAttachment;

    private $useShortAttachment;

    private $includeContextAndExtra;

    private $lineFormatter;

    public function __construct($token, $channel, $username = 'Monolog', $useAttachment = true, $iconEmoji = null, $level = Logger::CRITICAL, $bubble = true, $useShortAttachment = false, $includeContextAndExtra = false)
    {
        if (!extension_loaded('openssl')) {
            throw new MissingExtensionException('The OpenSSL PHP extension is required to use the SlackHandler');
        }

        parent::__construct('ssl://slack.com:443', $level, $bubble);

        $this->token = $token;
        $this->channel = $channel;
        $this->username = $username;
        $this->iconEmoji = trim($iconEmoji, ':');
        $this->useAttachment = $useAttachment;
        $this->useShortAttachment = $useShortAttachment;
        $this->includeContextAndExtra = $includeContextAndExtra;
        if ($this->includeContextAndExtra) {
            $this->lineFormatter = new LineFormatter;
        }
    }

    protected function generateDataStream($record)
    {
        $content = $this->buildContent($record);

        return $this->buildHeader($content) . $content;
    }

    private function buildContent($record)
    {
        $dataArray = $this->prepareContentData($record);

        return http_build_query($dataArray);
    }

    protected function prepareContentData($record)
    {
        $dataArray = array(
            'token'       => $this->token,
            'channel'     => $this->channel,
            'username'    => $this->username,
            'text'        => '',
            'attachments' => array()
        );

        if ($this->useAttachment) {
            $attachment = array(
                'fallback' => $record['message'],
                'color'    => $this->getAttachmentColor($record['level'])
            );

            if ($this->useShortAttachment) {
                $attachment['fields'] = array(
                    array(
                        'title' => $record['level_name'],
                        'value' => $record['message'],
                        'short' => false
                    )
                );
            } else {
                $attachment['fields'] = array(
                    array(
                        'title' => 'Message',
                        'value' => $record['message'],
                        'short' => false
                    ),
                    array(
                        'title' => 'Level',
                        'value' => $record['level_name'],
                        'short' => true
                    )
                );
            }

            if ($this->includeContextAndExtra) {
                if (!empty($record['extra'])) {
                    if ($this->useShortAttachment) {
                        $attachment['fields'][] = array(
                            'title' => "Extra",
                            'value' => $this->stringify($record['extra']),
                            'short' => $this->useShortAttachment
                        );
                    } else {
                        // Add all extra fields as individual fields in attachment
                        foreach ($record['extra'] as $var => $val) {
                            $attachment['fields'][] = array(
                                'title' => $var,
                                'value' => $val,
                                'short' => $this->useShortAttachment
                            );
                        }
                    }
                }

                if (!empty($record['context'])) {
                    if ($this->useShortAttachment) {
                        $attachment['fields'][] = array(
                            'title' => "Context",
                            'value' => $this->stringify($record['context']),
                            'short' => $this->useShortAttachment
                        );
                    } else {
                        // Add all context fields as individual fields in attachment
                        foreach ($record['context'] as $var => $val) {
                            $attachment['fields'][] = array(
                                'title' => $var,
                                'value' => $val,
                                'short' => $this->useShortAttachment
                            );
                        }
                    }
                }
            }

            $dataArray['attachments'] = json_encode(array($attachment));
        } else {
            $dataArray['text'] = $record['message'];
        }

        if ($this->iconEmoji) {
            $dataArray['icon_emoji'] = ":{$this->iconEmoji}:";
        }
        return $dataArray;
    }

    private function buildHeader($content)
    {
        $header = "POST /api/chat.postMessage HTTP/1.1\r\n";
        $header .= "Host: slack.com\r\n";
        $header .= "Content-Type: application/x-www-form-urlencoded\r\n";
        $header .= "Content-Length: " . strlen($content) . "\r\n";
        $header .= "\r\n";

        return $header;
    }

    protected function write(array $record)
    {
        parent::write($record);
        $this->closeSocket();
    }

    protected function getAttachmentColor($level)
    {
        switch (true) {
            case $level >= Logger::ERROR:
                return 'danger';
            case $level >= Logger::WARNING:
                return 'warning';
            case $level >= Logger::INFO:
                return 'good';
            default:
                return '#e3e4e6';
        }
    }

    protected function stringify($fields)
    {
        $string = '';
        foreach ($fields as $var => $val) {
            $string .= $var.': '.$this->lineFormatter->stringify($val)." | ";
        }

        $string = rtrim($string, " |");

        return $string;
    }
}