[Slack][API] How to well done the URL verification of Event API

Message APP Integration
1

Before to listen Events from Slack, you have to complete Event URL verification. ( please see url_verification )

When you click Even Subscriptions link of your Slack APP, you would see the page as below diagram.

https://api.slack.com/apps

https://api.slack.com/apps/{Your APP ID}/event-subscriptions .

As the diagram, it said they will send HTTP POST request to your Event Listener URL and then need your Event Listener to respond the challenge that it gave to you.

But actually, it send raw data to you. that means if you are using PHP, you CANNOT use $_POST to receive that. you have to use php://input .

( An interested question – PHP “php://input” vs $_POST  )

Here is a sample PHP code for reference.


<?php
$rawdata = file_get_contents('php://input');
$auth_event = json_decode($rawdata, true);
error_log('event: ' . print_r($auth_event, true));
print($auth_event['challenge']);
?>


$ tail -f /var/log/httpd/access

52.91.184.228 - - [20/Aug/2017:13:32:32 +0000] "POST /v1/slack/slashcode/listener HTTP/1.1" 200 1 "-" "Slackbot 1.0 (+https://api.slack.com/robots)"

$ tail -f /var/log/httpd/error

[Sun Aug 20 13:32:32.874573 2017] [:error] [pid 26406] [client 52.91.184.228:32907] event: Array\n(\n [token] => sQcqV3yOTBd4N3iF7ulcUCf7\n [challenge] => fzxFv3KmdVuhUMcaqp4aeAxIw4bAKKWDkaGpIUqhJXt6t1q7ybQb\n [type] => url_verification\n)\n

Once you passed verification, it will immediately show you verified message as bellow:

 

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