PHP Script to fetch the RSS feed to debian security and send a webhook to discord when it has a new one. (This generates dsaCache where it's ran.) Prerequisite: PHP>= 5.6, php5-cron, php5-cli, read and write access to local directory.

dsa-notification.php

<?php
/**
 * Usage: php dsa-notification.php
 * In cron (hourly): 0 * * * * cd /absolute/path/of/your/directory && php dsa-notification.php
 */
$hooks = ["https://discordapp.com/api/webhooks/{webhook.id}/{webhook.token}"];
if (php_sapi_name() == "cli") {
	$knownDSA = json_decode(file_get_contents("dsaCache"), true);

	$rssFeed = simplexml_load_string(file_get_contents("https://www.debian.org/security/dsa"));

	$webhookPayload = array();

	foreach ($rssFeed->item as $item) {
		$title = ($item->title) . "";
		if (!isset($knownDSA[$title])) {
			$knownDSA[$title] = time();
			$webhookPayload[$title] = [
				'title' => $title,
				'url' => ($item->link) . "",
				'description' => ($item->description) . "",
				'timestamp' => date("Y-m-d\\TH:i:s", strtotime(($item->children('dc', true)->date) . ""))
			];
		}
	}
	if (!empty($webhookPayload)) {
		if (count($webhookPayload) > 10) {
			$webhookPayload = array_slice($webhookPayload, 0, 10);
		}
		postWebhook(array("embeds" => array_reverse(array_values($webhookPayload))), $hooks);
	}

	file_put_contents("dsaCache", json_encode($knownDSA));
}

function postWebhook($dataArray = array(), $hooks) {
	if (!empty($dataArray['embeds']) || !empty($dataArray['content'])) {
		$dataJson = json_encode($dataArray);
		foreach ($hooks as $url) {
			$ch = curl_init($url);
			curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");
			curl_setopt($ch, CURLOPT_POSTFIELDS, $dataJson);
			curl_setopt($ch, CURLOPT_VERBOSE, true);
			curl_setopt($ch, CURLOPT_HTTPHEADER, array(
					'Content-Type: application/json',
					'Content-Length: ' . strlen($dataJson))
			);
			curl_exec($ch);
			curl_close($ch);
		}
	}
}