Report Cisco DNA web hook alerts to Slack

ciscodna_webhook_slack.php

<?php

// Setting up Slack Webhook URI

$slackUrl = 'https://hooks.slack.com/services/HIER_JE_WEBHOOK_URL';
$ciscoDnaUrl = 'https://DNA_IP/'; // Always add trailing slash
$ciscoRequest = json_decode(file_get_contents('php://input'));

// Checking wheter or not is a valid Cisco DNS webhook

if(empty($ciscoRequest) || empty($ciscoRequest->ciscoDnaEventLink)) {
    echo "Invalid Cisco DNA event. Aborting.";
    http_response_code(400);
    exit();
}


// Constructing a Slack message

$message = <<<EOL
{
	"blocks": [
		{
			"type": "header",
			"text": {
				"type": "plain_text",
				"text": "Cisco DNA alert: [eventid]",
				"emoji": true
			}
		},
		{
			"type": "section",
			"text": {
				"type": "plain_text",
				"text": "A new event was reported / an update was reported",
				"emoji": true
			}
		},
		{
			"type": "section",
			"fields": [eventdata]
		},
		{
			"type": "section",
			"text": {
				"type": "mrkdwn",
				"text": "Learn more about [eventid]"
			},
			"accessory": {
				"type": "button",
				"text": {
					"type": "plain_text",
					"text": "View event in Cisco DNA",
					"emoji": true
				},
				"value": "dna",
				"url": "[eventurl]",
				"action_id": "button-action"
			}
		}
	]
}
EOL;

// Compiling sections of data

$fields = [];
foreach($ciscoRequest->data as $key => $value) {
	$fields[] = [
		'type' => 'mrkdwn',
		'text' => "*".$key."*\n" . $value
	];
}

// Pretty printing event data

$eventData = json_encode($fields);

// Replacing with actual data

$message = str_replace('[eventid]', $ciscoRequest->eventId, $message);
$url = str_replace('https://&lt;DNAC_IP_ADDRESS&gt;/', $ciscoDnaUrl, $ciscoRequest->ciscoDnaEventLink);
$message = str_replace('[eventurl]', $url, $message);
$message = str_replace('[eventdata]', $eventData, $message);
$message = json_encode(json_decode($message));

// Sending message to Slack

$data = "payload=" .$message;

$ch = curl_init($slackUrl);
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");
curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

$result = curl_exec($ch);
curl_close($ch);