<?php
/*

Stan Scates
blr | further

stan@sc8s.com
blrfurther.com

Basic OAuth and caching layer for Seaofclouds' tweet.js, designed
to introduce compatibility with Twitter's v1.1 API.

Version: 1.4
Created: 2013.02.20

https://github.com/seaofclouds/tweet
https://github.com/themattharris/tmhOAuth

*/

if(empty($_POST)) { die(); }

class ezTweet {
/*************************************** config ***************************************/

   // Your Twitter App Consumer Key
private $consumer_key = 'YOUR_CONSUMER_KEY';

// Your Twitter App Consumer Secret
private $consumer_secret = 'YOUR_CONSUMER_SECRET';

// Your Twitter App Access Token
private $user_token = 'YOUR_ACCESS_TOKEN';

// Your Twitter App Access Token Secret
private $user_secret = 'YOUR_ACCESS_TOKEN_SECRET';

// Path to tmhOAuth libraries
private $lib = './lib/';

// Enable caching
private $cache_enabled = true;

// Cache interval (minutes)
private $cache_interval = 15;

// Path to writable cache directory
private $cache_dir = './';

// Enable debugging
private $debug = false;

/**************************************************************************************/

public function __construct() {
// Initialize paths and etc.
$this->pathify($this->cache_dir);
$this->pathify($this->lib);
$this->message = '';

// Set server-side debug params
if($this->debug === true) {
error_reporting(-1);
} else {
error_reporting(0);
}
}

public function fetch() {
echo json_encode(
array(
'response' => json_decode($this->getJSON(), true),
'message' => ($this->debug) ? $this->message : false
)
);
}

private function getJSON() {
if($this->cache_enabled === true) {
$CFID = $this->generateCFID();
$cache_file = $this->cache_dir.$CFID;

if(file_exists($cache_file) && (filemtime($cache_file) > (time() - 60 * intval($this->cache_interval)))) {
return file_get_contents($cache_file, FILE_USE_INCLUDE_PATH);
} else {

$JSONraw = $this->getTwitterJSON();
$JSON = $JSONraw['response'];

// Don't write a bad cache file if there was a CURL error
if($JSONraw['errno'] != 0) {
$this->consoleDebug($JSONraw['error']);
return $JSON;
}

if($this->debug === true) {
// Check for twitter-side errors
$pj = json_decode($JSON, true);
if(isset($pj['errors'])) {
foreach($pj['errors'] as $error) {
$message = 'Twitter Error: "'.$error['message'].'", Error Code #'.$error['code'];
$this->consoleDebug($message);
}
return false;
}
}

if(is_writable($this->cache_dir) && $JSONraw) {
if(file_put_contents($cache_file, $JSON, LOCK_EX) === false) {
$this->consoleDebug("Error writing cache file");
}
} else {
$this->consoleDebug("Cache directory is not writable");
}
return $JSON;
}
} else {
$JSONraw = $this->getTwitterJSON();

if($this->debug === true) {
// Check for CURL errors
if($JSONraw['errno'] != 0) {
$this->consoleDebug($JSONraw['error']);
}

// Check for twitter-side errors
$pj = json_decode($JSONraw['response'], true);
if(isset($pj['errors'])) {
foreach($pj['errors'] as $error) {
$message = 'Twitter Error: "'.$error['message'].'", Error Code #'.$error['code'];
$this->consoleDebug($message);
}
return false;
}
}
return $JSONraw['response'];
}
}

private function getTwitterJSON() {
require $this->lib.'tmhOAuth.php';
require $this->lib.'tmhUtilities.php';

$tmhOAuth = new tmhOAuth(array(
'host' => $_POST['request']['host'],
'consumer_key' => $this->consumer_key,
'consumer_secret' => $this->consumer_secret,
'user_token' => $this->user_token,
'user_secret' => $this->user_secret,
'curl_ssl_verifypeer' => false
));

$url = $_POST['request']['url'];
$params = $_POST['request']['parameters'];

$tmhOAuth->request('GET', $tmhOAuth->url($url), $params);
return $tmhOAuth->response;
}

private function generateCFID() {
// The unique cached filename ID
return md5(serialize($_POST)).'.json';
}

private function pathify(&$path) {
// Ensures our user-specified paths are up to snuff
$path = realpath($path).'/';
}

private function consoleDebug($message) {
if($this->debug === true) {
$this->message .= 'tweet.js: '.$message."\n";
}
}
}

$ezTweet = new ezTweet;
$ezTweet->fetch();

?>