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twip.php
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twip.php
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<?php
require(__ROOT__.'/include/twitteroauth.php');
require(__ROOT__.'/image_proxy.php');
class twip{
const PARENT_API = 'https://api.twitter.com/';
const PARENT_SEARCH_API = 'http://search.twitter.com/';
const ERR_LOGFILE = 'err.txt';
const LOGFILE = 'log.txt';
const LOGTIMEZONE = 'Etc/GMT-8';
const BASE_URL = 'http://yegle.net/twip/';
const API_VERSION = '1.1';
private function push_entities(&$status, &$entities, $type) {
if (isset($status->entities->$type)) {
foreach($status->entities->$type as &$entity) {
$entity->from = $type;
array_push($entities, $entity);
}
$status->entities->$type = array();
}
if ($type === 'media' && isset($status->extended_entities->$type)) {
$status->extended_entities->$type = array();
}
}
public function replace_tco_json(&$status){
if(!isset($status->entities)){
return;
}
$shift=0;
mb_internal_encoding('UTF-8');
$entities = array();
$this->push_entities($status, $entities, 'urls');
$this->push_entities($status, $entities, 'media');
$this->push_entities($status, $entities, 'symbols');
$this->push_entities($status, $entities, 'hashtags');
$this->push_entities($status, $entities, 'user_mentions');
// note that usort is not stable
usort($entities, function($a, $b) {
return $a->indices[0] - $b->indices[0];
});
$last = -1; // last start
$lastlen = 0;
$diff = 0;
foreach($entities as &$entity){
if (isset($entity->media_url_https)) {
$newtext = $entity->media_url_https;
}
elseif (isset($entity->expanded_url)) {
$newtext = $entity->expanded_url;
}
else {
$newtext = NULL;
}
if ($entity->indices[0] === $last) {
$entity->indices[0] += $shift - $diff + $lastlen;
$entity->indices[1] += $shift - $diff + $lastlen;
if ($newtext) {
$status->text = mb_substr($status->text, 0, $entity->indices[0] - 1) . ' ' . $newtext . mb_substr($status->text, $entity->indices[0] - 1);
$shift += mb_strlen($newtext) + 1;
}
}
else {
$last = $entity->indices[0];
$entity->indices[0] += $shift;
$entity->indices[1] += $shift;
if ($newtext) {
$status->text = mb_substr($status->text, 0, $entity->indices[0]) . $newtext . mb_substr($status->text, $entity->indices[1]);
$diff = mb_strlen($newtext) - mb_strlen($entity->url);
$shift += $diff;
}
}
if ($newtext) {
$entity->indices[1] = $entity->indices[0] + mb_strlen($newtext);
$entity->url = $newtext;
$lastlen = mb_strlen($newtext) + 1;
}
$from = $entity->from;
unset($entity->from);
array_push($status->entities->$from, $entity);
if ($from === 'media' && isset($status->extended_entities->$from)) {
array_push($status->extended_entities->$from, $entity);
}
}
}
public function json_x86_decode($in){
$in = preg_replace('/id":(\d+)/', 'id":"s\1"', $in);
return json_decode($in);
}
public function json_x86_encode($in){
$in = json_encode($in);
return preg_replace('/id":"s(\d+)"/', 'id":\1', $in);
}
public function parse_entities($status){
if($this->o_mode_parse_entities){
$j = is_string($status) ? $this->json_x86_decode($status) : $status;
if(is_array($j)){
foreach($j as &$s){
$s = $this->parse_entities($s);
}
}
else {
$this->replace_tco_json($j);
if(isset($j->status)){
$this->replace_tco_json($j->status);
}
if(isset($j->retweeted_status)){
$this->replace_tco_json($j->retweeted_status);
}
if(isset($j->status->retweeted_status)){
$this->replace_tco_json($j->status->retweeted_status);
}
}
return is_string($status) ? $this->json_x86_encode($j) : $j;
}
return $status;
}
function __construct($options = null){
$this->parse_variables($options);
# Import all filters
foreach(glob('filters/*.php') as $f) {
include_once($f);
}
unset($f);
ob_start();
$compressed = $this->compress && Extension_Loaded('zlib') && ob_start("ob_gzhandler");
if($this->mode=='t'){
$this->transparent_mode();
}
else if($this->mode=='o'){
$this->override_mode();
}
else if($this->mode=='i'){
$this->override_mode(true);
}
else{
header('HTTP/1.0 400 Bad Request');
exit();
}
$str = ob_get_contents();
if ($compressed) ob_end_flush();
header('Content-Length: '.ob_get_length());
ob_flush();
if($this->debug){
print_r($this);
print_r($_SERVER);
file_put_contents('debug',ob_get_contents().$str);
ob_clean();
}
if($this->dolog){
file_put_contents('log',$this->method.' '.$this->request_uri."\n",FILE_APPEND);
}
}
private function parse_variables($options){
//parse options
$this->parent_api = isset($options['parent_api']) ? $options['parent_api'] : self::PARENT_API;
$this->api_version = isset($options['api_version']) ? $options['api_version'] : self::API_VERSION;
$this->debug = isset($options['debug']) ? !!$options['debug'] : FALSE;
$this->dolog = isset($options['dolog']) ? !!$options['dolog'] : FALSE;
$this->compress = isset($options['compress']) ? !!$options['compress'] : FALSE;
$this->oauth_key = $options['oauth_key'];
$this->oauth_secret = $options['oauth_secret'];
$this->oauth_key_get = $options['oauth_key_get'];
$this->oauth_secret_get = $options['oauth_secret_get'];
$this->o_mode_parse_entities = isset($options['o_mode_parse_entities']) ? !!$options['o_mode_parse_entities'] : FALSE;
if(substr($this->parent_api, -1) !== '/') $this->parent_api .= '/';
$this->base_url = isset($options['base_url']) ? trim($options['base_url'],'/').'/' : self::BASE_URL;
if(preg_match('/^https?:\/\//i',$this->base_url) == 0){
$this->base_url = 'http://'.$this->base_url;
}
//parse $_SERVER
$this->method = $_SERVER['REQUEST_METHOD'];
$this->parse_request_uri();
}
private function override_mode($imageproxy = FALSE){
$tokenfile = glob('oauth/'.$this->password.'.*');
if(!empty($tokenfile)){
$access_token = @file_get_contents($tokenfile[0]);
}
if(empty($access_token)){
header('HTTP/1.1 401 Unauthorized');
header('WWW-Authenticate: Basic realm="Twip4 Override Mode"');
echo 'You are not allowed to use this API proxy';
exit();
}
$access_token = unserialize($access_token);
$this->access_token = $access_token;
$this->has_get_token = isset($access_token['oauth_token_get']);
if($imageproxy){
if($this->method=='POST'){
echo imageUpload($this->oauth_key, $this->oauth_secret, $this->access_token);
}else{
echo 'The image proxy needs POST method.';
}
return;
}
if($this->request_uri == null){
echo 'click <a href="'.$this->base_url.'oauth.php">HERE</a> to get your API url';
return;
}
$this->parameters = $this->get_parameters();
foreach(array('pc', 'earned') as $param) {
unset($this->parameters[$param]);
}
$this->connection = new TwitterOAuth($this->oauth_key, $this->oauth_secret, $this->access_token['oauth_token'], $this->access_token['oauth_token_secret']);
$this->connection_get = $this->has_get_token ? new TwitterOAuth($this->oauth_key_get, $this->oauth_secret_get, $this->access_token['oauth_token_get'], $this->access_token['oauth_token_secret_get']) : $this->connection;
$filterName = Twip::encode_uri($this->forwarded_request_uri);
if (!array_key_exists($filterName, $this->filters)) {
$filterName = '_default';
}
$parts = parse_url($this->forwarded_request_uri);
$raw_response = $this->filters[$filterName](array(
'path' => $parts['path'],
'method' => $this->method,
'params' => $this->parameters,
'self' => $this,
));
echo $this->parse_entities($raw_response);
return;
}
private function transparent_mode(){
$this->uri_fixer();
$ch = curl_init($this->request_uri);
$this->request_headers = OAuthUtil::get_headers();
// Don't parse POST arguments as array if emulating a browser submit
if(isset($this->request_headers['Content-Type']) &&
strpos($this->request_headers['Content-Type'], 'application/x-www-form-urlencoded') !== FALSE){
$this->parameters = $this->get_parameters(false);
}else{
$this->parameters = $this->get_parameters(true);
}
// Process Upload image (currently only first file will proxy to Twitter)
if(strpos($this->request_uri,'statuses/update_with_media') !== FALSE &&
strpos(@$this->request_headers['Content-Type'], 'multipart/form-data') !== FALSE) {
$this->parameters = preg_replace('/^@/', "\0@", $_POST);
if(count($_FILES) > 0 && isset($_FILES['media'])) {
$media = $_FILES['media'];
$fn = is_array($media['tmp_name']) ? $media['tmp_name'][0] : $media['tmp_name'];
$this->parameters["media[]"] = '@' . $fn;
unset($this->request_headers['Content-Type']);
}
}
$forwarded_headers = array(
'User-Agent',
'Authorization',
'Content-Type',
'X-Forwarded-For',
'Expect',
);
foreach($forwarded_headers as $header){
if(isset($this->request_headers[$header])){
$this->forwarded_headers[] = $header.': '.$this->request_headers[$header];
}
}
if(!isset($this->forwarded_headers['Expect'])) $this->forwarded_headers[] = 'Expect:';
curl_setopt($ch,CURLOPT_HTTPHEADER,$this->forwarded_headers);
curl_setopt($ch,CURLOPT_HEADERFUNCTION,array($this,'headerfunction'));
if($this->method != 'GET'){
curl_setopt($ch,CURLOPT_CUSTOMREQUEST,$this->method);
curl_setopt($ch,CURLOPT_POSTFIELDS,$this->parameters);
}
curl_setopt($ch,CURLOPT_RETURNTRANSFER,TRUE);
$ret = curl_exec($ch);
//fixme:redirect request back to twip,this is nasty and insecure...
if(strpos($this->request_uri,'oauth/authorize?oauth_token=')!==FALSE){
$ret = str_replace('<form action="https://api.twitter.com/oauth/authorize"','<form action="'.$this->base_url.'t/oauth/authorize"',$ret);
$ret = str_replace('<div id="signin_form">','<h1><strong style="color:red">Warning!This page is proxied by twip and therefore you may leak your password to API proxy owner!</strong></h1><div id="signin_form">',$ret);
}
echo $ret;
}
private function uri_fixer(){
// $api is the API request without version number
list($version, $api) = $this->extract_uri_version($this->request_uri);
// If user specified version, use that version. Else use default version
$version = ($version == "") ? $this->api_version : $version;
$this->request_headers['Host'] = 'api.twitter.com';
if($version === "1") {
header("HTTP/1.0 410 Gone");
die();
}
$replacement = array(
'pc=true' => 'pc=false', //change pc=true to pc=false
'&earned=true' => '', //remove "&earned=true"
);
$api = str_replace(array_keys($replacement), array_values($replacement), $api);
if( strpos($api,'oauth/') === 0 ) {
// These API requests don't needs version string
$this->request_uri = sprintf("%s%s", $this->parent_api, $api);
}else{
$this->request_uri = sprintf("%s%s/%s", $this->parent_api, $version, $api);
}
}
public function extract_uri_version($uri){
$re = '/^(([0-9.]+)\/)?(.*)/';
preg_match($re, $uri, $matches);
$version = $matches[2];
$api = $matches[3];
return array($version, $api);
}
private function parse_request_uri(){
// old value
//$full_request_uri = substr($_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI'],strlen(preg_replace('/^https?:\/\//i','',$this->base_url)));
if (strlen(dirname($_SERVER['SCRIPT_NAME'])) > 1) {
$full_request_uri = substr(
$_SERVER['REQUEST_URI'],
strlen(dirname($_SERVER['SCRIPT_NAME'])));
} else {
$full_request_uri = $_SERVER['REQUEST_URI'];
}
$prefix = substr($full_request_uri, 0, 3);
switch($prefix) {
case '/o/':
// full_request_uri: /o/PASSWORD/1.1/xxx/xxx.json
$this->mode = 'o';
list($this->password, $forwarded_request_uri) = explode('/', substr($full_request_uri, 3), 2);
$this->forwarded_request_uri = $this->request_uri = $forwarded_request_uri;
break;
case '/i/':
$this->mode = 'i';
// full_request_uri: /i/?????
// does this mode need this parsing anyway? @yegle
list($this->password, $forwarded_request_uri) = explode('/', substr($full_request_uri, 3), 2);
$this->forwarded_request_uri = $this->request_uri = $forwarded_request_uri;
break;
case '/t/':
// full_request_uri: /t/1.1/xxx/xxx.json
$this->mode = 't';
$this->request_uri = substr($full_request_uri, 3);
break;
default:
$this->mode = 'UNKNOWN';
break;
}
}
public function headerfunction($ch,$str){
if(strpos($str,'Content-Length:')!==FALSE){
header($str);
}
$this->response_headers[] = $str;
return strlen($str);
}
private function get_parameters($returnArray = TRUE){
if($returnArray) {
return $_REQUEST;
}
else {
return http_build_query($_REQUEST);
}
}
public static function encode_uri($raw_uri) {
$parts = parse_url($raw_uri);
$path = $parts['path'];
$replacements = array(
'/' => '__',
'.' => '_',
);
$regex_replacements = array(
'/\d{2,}/' => 'NUMBER',
);
$path = str_replace(
array_keys($replacements),
array_values($replacements),
$path
);
$path = preg_replace(
array_keys($regex_replacements),
array_values($regex_replacements),
$path
);
return $path;
}
}
?>