<?php
$url = "URL_TO_OWNCAST_WEBSERVER";
$token = "YOUR_TOKEN_HERE"; // you may have to manually escape hypens with a backslash
$tracker_file = "/tmp/owncast_to_matrix.json"; // tracks which messages have been sent to Matrix already
if(file_exists($tracker_file))
   $tracker = json_decode(file_get_contents($tracker_file), true);

$endpoint = "/api/chat";

require("matrix.class.php");

while(true) {
   $data = json_decode(file_get_contents($url.$endpoint), true);
   $last_slice = array_slice($data, -20);

   foreach($last_slice as $line) {
      if($line['type'] == "CHAT") {
         if(!array_key_exists($line['id'], $tracker)) {
            $str = "<Owncast: ".$line['author']."> ".htmlspecialchars_decode(strip_tags($line['body']), ENT_QUOTES);
            $tracker[$line['id']] = strip_tags($line['body']);
            if(!empty($str)) {
               $mat = new matrix();
               $room = "#geek";
               $mat->post($str, $room);
            }
         }
      }
   }
   file_put_contents($tracker_file, json_encode($tracker));
   sleep(20);
}