<?php
class TwitchAPI {
	public $url;
	public $cachedir = "/home/user/somedir";
	public $cachetime = 60;
	public $oauth = null;
	private $clientid = "";

	private function getFromTwitch($u,$f) {
		// Last updated 2018-04-13 for v5 Kraken to v"New" Helix transition
		$s = curl_init(); 
		$headers[] = 'Client-ID: '.$this->clientid;
		if ($this->oauth != null) {
		    $headers[] = 'Authorization: OAuth '.$this->oauth;
			// clear after each use
			$this->oauth = null;
		}
		if (preg_match('/\/kraken\//',$u)) {
		    $headers[] = 'Accept: application/vnd.twitchtv.v5+json';
		}
		curl_setopt($s,CURLOPT_HTTPHEADER,$headers);
		// clear after each use
		$headers = null;
		curl_setopt($s,CURLOPT_URL,$u); 
		curl_setopt($s,CURLOPT_RETURNTRANSFER, 1);
		$data = curl_exec($s);
		curl_close($s);
		$fp = fopen($f,"w");
		fwrite($fp,$data);
		fclose($fp);
		return $data;
	}

	function get($apiurl = "api.twitch.tv",$secure = true) {
		$prefix = "http://";
		if ($secure) { $prefix = "https://"; }
		$inturl = $prefix.$apiurl."/".$this->url;
		$md5 = md5($inturl);
		$cachefile = $this->cachedir."/".$md5;
		if (file_exists($cachefile)) {
			$mtime = filemtime($cachefile);
			$time = time();
			if (($time - $mtime) > $this->cachetime) {
				return $this->getFromTwitch($inturl,$cachefile);
			} else {
				return file_get_contents($cachefile);
			}
		} else {
			return $this->getFromTwitch($inturl,$cachefile);
		}
	}
}