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February 1, 2019 12:50
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Verifying requests from Slack in PHP
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<?php | |
/* | |
Verifying requests from Slack | |
https://api.slack.com/docs/verifying-requests-from-slack | |
The slack message has two buttons, Approve and Deny | |
verify the request from Slack and update approved or denied | |
*/ | |
$raw_body = file_get_contents('php://input'); | |
$response = ["message" => "success"]; | |
if(empty($_POST['payload'])){ | |
header('HTTP/1.1 400 Bad Request', true, 400); | |
exit; | |
} | |
// slack signing secret | |
$SLACK_SIGNING_SECRET = ''; | |
$body = urldecode($_POST['payload']); | |
$message = json_decode($body, true); | |
if(empty($_SERVER['HTTP_X_SLACK_SIGNATURE']) || empty($_SERVER['HTTP_X_SLACK_REQUEST_TIMESTAMP'])){ | |
header('HTTP/1.1 400 Bad Request', true, 400); | |
exit; | |
} else { | |
$version = explode("=", $_SERVER['HTTP_X_SLACK_SIGNATURE']); | |
$timestamp = $_SERVER['HTTP_X_SLACK_REQUEST_TIMESTAMP']; | |
$token = $message['token']; | |
$sig_basestring = "{$version[0]}:$timestamp:$raw_body"; | |
$hash_signature = hash_hmac('sha256', $sig_basestring, $SLACK_SIGNING_SECRET); | |
if(!hash_equals($_SERVER['HTTP_X_SLACK_SIGNATURE'], "v0=$hash_signature")){ | |
header('HTTP/1.1 400 Bad Request', true, 400); | |
exit; | |
} | |
} | |
if(empty($message['callback_id']) || empty($message['actions'])){ | |
header('HTTP/1.1 400 Bad Request', true, 400); | |
exit; | |
} | |
// use the callback_id and action to perform app function | |
// database update or response | |
$approved = $message['actions'][0]['value']; | |
//callback_id has a database table id | |
$response = myDatabaseCall($message['callback_id'], $approved); | |
// update response | |
$response = $message['original_message']; | |
// remove buttons | |
$response['attachments'][0]['actions'] = []; | |
// update pretext | |
if($approved == '1'){ | |
$response['attachments'][0]['color'] = 'good'; | |
$response['attachments'][0]['pretext'] = "<@{$message['user']['name']}> Approved this {$type[0]}."; | |
} else { | |
$response['attachments'][0]['color'] = 'danger'; | |
$response['attachments'][0]['pretext'] = "<@{$message['user']['name']}> Denied this {$type[0]}."; | |
} | |
header('Content-Type: application/json'); | |
echo json_encode($response); | |
?> |
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$token
from line 26 seems unused, is this correct?