<?php

class Wechat
{
const MSGTYPE_TEXT = 'text';
const MSGTYPE_IMAGE = 'image';
const MSGTYPE_LOCATION = 'location';
const MSGTYPE_link = 'link';
const MSGTYPE_EVENT = 'event';
const MSGTYPE_MUSIC = 'music';
const MSGTYPE_NEWS = 'news';
const MSGTYPE_VOICE = 'voice';
const MSGTYPE_VIDEO = 'video';
const API_URL_PREFIX = 'https://api.weixin.qq.com/cgi-bin';
const AUTH_URL = '/token?grant_type=client_credential&';
const MENU_CREATE_URL = '/menu/create?';
const MENU_GET_URL = '/menu/get?';
const MENU_DELETE_URL = '/menu/delete?';
const MEDIA_GET_URL = '/media/get?';

private $token;
private $appid;
private $appsecret;
private $access_token;
private $_msg;
private $_funcflag = false;
private $_receive;
public $debug = false;
public $errCode = 40001;
public $errMsg = "no access";
private $_logcallback;

public function __construct($options)
{
$this->token = isset($options['token'])?$options['token']:'';
$this->appid = isset($options['appid'])?$options['appid']:'';
$this->appsecret = isset($options['appsecret'])?$options['appsecret']:'';
$this->debug = isset($options['debug'])?$options['debug']:false;
$this->_logcallback = isset($options['logcallback'])?$options['logcallback']:false;
}


private function checkSignature()
{
$signature = isset($_GET["signature"])?$_GET["signature"]:'';
$timestamp = isset($_GET["timestamp"])?$_GET["timestamp"]:'';
$nonce = isset($_GET["nonce"])?$_GET["nonce"]:'';

$token = $this->token;
$tmpArr = array($token, $timestamp, $nonce);
sort($tmpArr);
$tmpStr = implode( $tmpArr );
$tmpStr = sha1( $tmpStr );

if( $tmpStr == $signature ){
return true;
}else{
return false;
}
}


public function valid($return=false)
{
$echoStr = isset($_GET["echostr"]) ? $_GET["echostr"]: '';
if ($return) {
if ($echoStr) {
if ($this->checkSignature())
return $echoStr;
else
return false;
} else
return $this->checkSignature();
} else {
if ($echoStr) {
if ($this->checkSignature())
die($echoStr);
else
die('no access');
} else {
if ($this->checkSignature())
return true;
else
die('no access');
}
}
return false;
}


public function Message($msg = '',$append = false){
if (is_null($msg)) {
$this->_msg =array();
}elseif (is_array($msg)) {
if ($append)
$this->_msg = array_merge($this->_msg,$msg);
else
$this->_msg = $msg;
return $this->_msg;
} else {
return $this->_msg;
}
}

public function setFuncFlag($flag) {
$this->_funcflag = $flag;
return $this;
}

private function log($log){
if ($this->debug && function_exists($this->_logcallback)) {
if (is_array($log)) $log = print_r($log,true);
return call_user_func($this->_logcallback,$log);
}
}


public function getRev()
{
$postStr = file_get_contents("php://input");
$this->log($postStr);
if (!empty($postStr)) {
$this->_receive = (array)simplexml_load_string($postStr, 'SimpleXMLElement', LIBXML_NOCDATA);
}
return $this;
}


public function getRevData()
{
return $this->_receive;
}


public function getRevFrom() {
if ($this->_receive)
return $this->_receive['FromUserName'];
else
return false;
}


public function getRevTo() {
if ($this->_receive)
return $this->_receive['ToUserName'];
else
return false;
}


public function getRevType() {
if (isset($this->_receive['MsgType']))
return $this->_receive['MsgType'];
else
return false;
}


public function getRevID() {
if (isset($this->_receive['MsgId']))
return $this->_receive['MsgId'];
else
return false;
}


public function getRevCtime() {
if (isset($this->_receive['CreateTime']))
return $this->_receive['CreateTime'];
else
return false;
}


public function getRevContent(){
if (isset($this->_receive['Content']))
return $this->_receive['Content'];
else if (isset($this->_receive['Recognition'])) //獲取語音識別文字內容，需申請開通
return $this->_receive['Recognition'];
else
return false;
}


public function getRevPic(){
if (isset($this->_receive['PicUrl']))
return $this->_receive['PicUrl'];
else
return false;
}


public function getRevlink(){
if (isset($this->_receive['Url'])){
return array(
'url'=>$this->_receive['Url'],
'title'=>$this->_receive['Title'],
'description'=>$this->_receive['Description']
);
} else
return false;
}


public function getRevGeo(){
if (isset($this->_receive['Location_X'])){
return array(
'x'=>$this->_receive['Location_X'],
'y'=>$this->_receive['Location_Y'],
'scale'=>$this->_receive['Scale'],
'label'=>$this->_receive['Label']
);
} else
return false;
}


public function getRevEvent(){
if (isset($this->_receive['Event'])){
return array(
'event'=>$this->_receive['Event'],
'key'=>$this->_receive['EventKey'],
);
} else
return false;
}


public function getRevVoice(){
if (isset($this->_receive['MediaId'])){
return array(
'mediaid'=>$this->_receive['MediaId'],
'format'=>$this->_receive['Format'],
);
} else
return false;
}


public function getRevVideo(){
if (isset($this->_receive['MediaId'])){
return array(
'mediaid'=>$this->_receive['MediaId'],
'thumbmediaid'=>$this->_receive['ThumbMediaId']
);
} else
return false;
}

public static function xmlSafeStr($str)
{
return '<![CDATA['.preg_replac("/[\\x00-\\x08\\x0b-\\x0c\\x0e-\\x1f]/",'',$str).']]>';
}


public static function data_to_xml($data) {
$xml = '';
foreach ($data as $key => $val) {
is_numeric($key) && $key = "item id=\"$key\"";
$xml .= "<$key>";
$xml .= ( is_array($val) || is_object($val)) ? self::data_to_xml($val) : self::xmlSafeStr($val);
list($key, ) = explode(' ', $key);
$xml .= "</$key>";
}
return $xml;
}


public function xml_encode($data, $root='xml', $item='item', $attr='', $id='id', $encoding='utf-8') {
if(is_array($attr)){
$_attr = array();
foreach ($attr as $key => $value) {
$_attr[] = "{$key}=\"{$value}\"";
}
$attr = implode(' ', $_attr);
}
$attr = trim($attr);
$attr = empty($attr) ? '' : " {$attr}";
$xml = "<{$root}{$attr}>";
$xml .= self::data_to_xml($data, $item, $id);
$xml .= "</{$root}>";
return $xml;
}


public function text($text='')
{
$FuncFlag = $this->_funcflag ? 1 : 0;
$msg = array(
'ToUserName' => $this->getRevFrom(),
'FromUserName'=>$this->getRevTo(),
'MsgType'=>self::MSGTYPE_TEXT,
'Content'=>$text,
'CreateTime'=>time(),
'FuncFlag'=>$FuncFlag
);
$this->Message($msg);
return $this;
}


public function music($title,$desc,$musicurl,$hgmusicurl='') {
$FuncFlag = $this->_funcflag ? 1 : 0;
$msg = array(
'ToUserName' => $this->getRevFrom(),
'FromUserName'=>$this->getRevTo(),
'CreateTime'=>time(),
'MsgType'=>self::MSGTYPE_MUSIC,
'Music'=>array(
'Title'=>$title,
'Description'=>$desc,
'MusicUrl'=>$musicurl,
'HQMusicUrl'=>$hgmusicurl
),
'FuncFlag'=>$FuncFlag
);
$this->Message($msg);
return $this;
}

public function news($newsData=array())
{
$FuncFlag = $this->_funcflag ? 1 : 0;
$count = count($newsData);

$msg = array(
'ToUserName' => $this->getRevFrom(),
'FromUserName'=>$this->getRevTo(),
'MsgType'=>self::MSGTYPE_NEWS,
'CreateTime'=>time(),
'ArticleCount'=>$count,
'Articles'=>$newsData,
'FuncFlag'=>$FuncFlag
);
$this->Message($msg);
return $this;
}


public function reply($msg=array(),$return = false)
{
if (empty($msg))
$msg = $this->_msg;
$xmldata= $this->xml_encode($msg);
$this->log($xmldata);
if ($return)
return $xmldata;
else
echo $xmldata;
}



private function http_get($url){
$oCurl = curl_init();
if(stripos($url,"https://")!==FALSE){
curl_setopt($oCurl, CURLOPT_SSL_VERIFYPEER, FALSE);
curl_setopt($oCurl, CURLOPT_SSL_VERIFYHOST, FALSE);
}
curl_setopt($oCurl, CURLOPT_URL, $url);
curl_setopt($oCurl, CURLOPT_RETURNTRANSFER, 1 );
$sContent = curl_exec($oCurl);
$aStatus = curl_getinfo($oCurl);
curl_close($oCurl);
if(intval($aStatus["http_code"])==200){
return $sContent;
}else{
return false;
}
}


private function http_post($url,$param){
$oCurl = curl_init();
if(stripos($url,"https://")!==FALSE){
curl_setopt($oCurl, CURLOPT_SSL_VERIFYPEER, FALSE);
curl_setopt($oCurl, CURLOPT_SSL_VERIFYHOST, false);
}
if (is_string($param)) {
$strPOST = $param;
} else {
$aPOST = array();
foreach($param as $key=>$val){
$aPOST[] = $key."=".urlencode($val);
}
$strPOST = join("&", $aPOST);
}
curl_setopt($oCurl, CURLOPT_URL, $url);
curl_setopt($oCurl, CURLOPT_RETURNTRANSFER, 1 );
curl_setopt($oCurl, CURLOPT_POST,true);
curl_setopt($oCurl, CURLOPT_POSTFIELDS,$strPOST);
$sContent = curl_exec($oCurl);
$aStatus = curl_getinfo($oCurl);
curl_close($oCurl);
if(intval($aStatus["http_code"])==200){
return $sContent;
}else{
return false;
}
}


public function checkAuth($appid='',$appsecret=''){
if (!$appid || !$appsecret) {
$appid = $this->appid;
$appsecret = $this->appsecret;
}
//TODO: get the cache access_token
$result = $this->http_get(self::API_URL_PREFIX.self::AUTH_URL.'appid='.$appid.'&secret='.$appsecret);
if ($result)
{
$json = json_decode($result,true);
if (!$json || isset($json['errcode'])) {
$this->errCode = $json['errcode'];
$this->errMsg = $json['errmsg'];
return false;
}
$this->access_token = $json['access_token'];
$expire = $json['expires_in'] ? intval($json['expires_in'])-100 : 3600;
//TODO: cache access_token
return $this->access_token;
}
return false;
}


public function resetAuth($appid=''){
$this->access_token = '';
//TODO: remove cache
return true;
}


static function json_encode($arr) {
$parts = array ();
$is_list = false;
//Find out if the given array is a numerical array
$keys = array_keys ( $arr );
$max_length = count ( $arr ) - 1;
if (($keys [0] === 0) && ($keys [$max_length] === $max_length )) { //See if the first key is 0 and last key is length - 1
$is_list = true;
for($i = 0; $i < count ( $keys ); $i ++) { //See if each key correspondes to its position
if ($i != $keys [$i]) { //A key fails at position check.
$is_list = false; //It is an associative array.
break;
}
}
}
foreach ( $arr as $key => $value ) {
if (is_array ( $value )) { //Custom handling for arrays
if ($is_list)
$parts [] = self::json_encode ( $value );
else
$parts [] = '"' . $key . '":' . self::json_encode ( $value );
} else {
$str = '';
if (! $is_list)
$str = '"' . $key . '":';
//Custom handling for multiple data types
if (is_numeric ( $value ) && $value<2000000000)
$str .= $value; //Numbers
elseif ($value === false)
$str .= 'false'; //The booleans
elseif ($value === true)
$str .= 'true';
else
$str .= '"' . addslashes ( $value ) . '"'; //All other things
// :TODO: Is there any more datatype we should be in the lookout for? (Object?)
$parts [] = $str;
}
}
$json = implode ( ',', $parts );
if ($is_list)
return '[' . $json . ']'; //Return numerical JSON
return '{' . $json . '}'; //Return associative JSON
}


public function createMenu($data){
if (!$this->access_token && !$this->checkAuth()) return false;
$result = $this->http_post(self::API_URL_PREFIX.self::MENU_CREATE_URL.'access_token='.$this->access_token,self::json_encode($data));
if ($result)
{
$json = json_decode($result,true);
if (!$json || $json['errcode']>0) {
$this->errCode = $json['errcode'];
$this->errMsg = $json['errmsg'];
return false;
}
return true;
}
return false;
}


public function getMenu(){
if (!$this->access_token && !$this->checkAuth()) return false;
$result = $this->http_get(self::API_URL_PREFIX.self::MENU_GET_URL.'access_token='.$this->access_token);
if ($result)
{
$json = json_decode($result,true);
if (!$json || isset($json['errcode'])) {
$this->errCode = $json['errcode'];
$this->errMsg = $json['errmsg'];
return false;
}
return $json;
}
return false;
}


public function deleteMenu(){
if (!$this->access_token && !$this->checkAuth()) return false;
$result = $this->http_get(self::API_URL_PREFIX.self::MENU_DELETE_URL.'access_token='.$this->access_token);
if ($result)
{
$json = json_decode($result,true);
if (!$json || $json['errcode']>0) {
$this->errCode = $json['errcode'];
$this->errMsg = $json['errmsg'];
return false;
}
return true;
}
return false;
}


public function getMedia($media_id){
if (!$this->access_token && !$this->checkAuth()) return false;
$result = $this->http_get(self::API_URL_PREFIX.self::MEDIA_GET_URL.'access_token='.$this->access_token).'&media_id='.$media_id;
if ($result)
{
$json = json_decode($result,true);
if (isset($json['errcode'])) {
$this->errCode = $json['errcode'];
$this->errMsg = $json['errmsg'];
return false;
}
return $result;
}
return false;
}
}

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