<?php
    class matrix {
     
       function __construct() {
          $this->homeserver = "glasgow.social";
          $this->access_token = "ACCESS_TOKEN_HERE";
          // room lookups
          $this->rooms = array(      
                                     "#room_name"=> "!room_id:glasgow.social",
                               );
       }
     
       function post($msg, $room_name = "#glasgow", $formatted_msg = null) {
          $msgtype = "m.text";
          if(preg_match("/^#/", $room_name)) {
             $room = $this->rooms[$room_name];
          } else {
             $room = $room_name;
          }
          $url = "https://".$this->homeserver."/_matrix/client/r0/rooms/$room/send/m.room.message?access_token=".$this->access_token;
          $payload = array("msgtype"=>$msgtype, "body"=>$msg);
          if(!is_null($formatted_msg)) {
             $payload['format'] = "org.matrix.custom.html";
             $payload['formatted_body'] = $formatted_msg;
          }
          $payload = json_encode($payload);
          $ch = curl_init($url);
          curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
          curl_setopt($ch, CURLOPT_POSTFIELDS, $payload);
          $response = curl_exec($ch);
       }
     
       function get_rooms() {
          $url = "https://".$this->homeserver."/_matrix/client/r0/joined_rooms?access_token=".$this->access_token;
          $data = file_get_contents($url);
          return json_decode($data, true);
       }
     
       function send_direct_message($hostmask, $msg) {
          if(preg_match("/^!/", $hostmask)) {
             $private_room_id = $hostmask;
          } else {
             $private_room_id = $this->create_private_room($hostmask);
          }
          if($private_room_id) {
             $this->post($msg, $private_room_id);
             return $private_room_id;
          } else {
             error_log("Unable to create private room for $hostmask");
          }
          return false;
       }
     
       function get_new_events($room, $from = null) {
     
          if(is_null($from))
             $from = $this->get_from_time($room);
     
          $url = "https://{$this->homeserver}/_matrix/client/r0/rooms/$room/messages?access_token={$this->access_token}&from=$from&limit=40";
     
          $cache_filename = "/tmp/".md5($room).".cache";
          if(!file_exists($cache_filename)) {
             $content = file_get_contents($url);
             file_put_contents($cache_filename, $content);
          } else {
             $cache_ts = filemtime($cache_filename);
             if($cache_ts >= strtotime('-5 seconds')) {
                $content = file_get_contents($cache_filename);
             } else {
                $content = file_get_contents($url);
             } else {
                $content = file_get_contents($url);
                file_put_contents($cache_filename, $content);
             }
          }
     
       $data = json_decode($content, true);
       return $data;
    }
     
       function get_sync_token($room) {
          $json_filter["room"]["rooms"] = array("$room");
          $url = "https://{$this->homeserver}/_matrix/client/r0/sync?access_token={$this->access_token}&filter=".json_encode($json_filter);
          $content = file_get_contents($url);
          $data = json_decode($content, true);
          return false;
       }
     
     
       function get_from_time($room) {
          $filename = "/tmp/".md5($room).".fromts";
          if(file_exists($filename)) {
             $from_ts = filemtime($filename);
             if($from_ts <= strtotime('-30 minutes')) {
                error_log("GETNEWEVENTS: FROMTS Cache hit");
                $from = $this->set_from_time($room);
                file_put_contents($filename, $from);
             }
             $data = file_get_contents($filename);
             return $data;
          } else {
             error_log("GETNEWEVENTS: FROMTS file didn't exist.");
             $from = $this->set_from_time($room);
             return $from;
          }
       }
     
       function set_from_time($room, $from = null) {
          if(is_null($from)) {
             $from = $this->get_sync_token($room);
          }
          $filename = "/tmp/".md5($room).".fromts";
          file_put_contents($filename, $from);
          file_put_contents($filename, $from);
          return $from;
       }
     
       function del_cache($room) {
          $cache_filename = "/tmp/".md5($room).".cache";
          unlink($cache_filename);
       }
    }
    }
?>