微信分享类

这个是在ci项目中，用到的微信分享的一个类，储存用的redis

/**
 * wechart service
 * 微信service
 * 
 * @author guomumin<aaron8573@gmail.com>
 * @date 2016-03-21
 */
class Wechart
{
 
 /**
 * 微信存储到redis中的access_token key
 * @var string
 */
 const ACCESS_TOKEN_KEY = 'wechart_access_token';
 
 /**
 * 微信存储到redis中的jsapi_ticket key
 * @var string
 */
 const JSAPI_TICKET_KEY = 'wechart_jsapi_ticket';
 
 /**
 * 微信标识
 * @var string
 */
 private $_app_id = NULL;
 
 /**
 * 微信秘钥
 * @var string
 */
 private $_app_secret = NULL;
 
 /**
 * 微信授权秘钥
 * @var string
 */
 private $_accress_token = NULL;
 
 /**
 * 微信jsapi
 * @var string
 */
 private $_api_ticket = NULL;
 
 /**
 * 微信授权地址
 * @var string
 */
 private $_token_url = 'https://api.weixin.qq.com/cgi-bin/token';
 
 /**
 * jsapi获取ticket地址
 * @var string
 */
 private $_ticket_url = 'https://api.weixin.qq.com/cgi-bin/ticket/getticket';
 
 public function __construct()
 {
 parent::__construct();
 
 
 $this->_app_id = ''; //你的app_id
 $this->_app_secret = ''; //你的app_secret
 
 $this->load->driver('cache');
 }
 
 /**
 * 获取access_token
 * @return WechartService
 */
 public function getToken()
 {
 $token_info = $this->cache->redis->get(self::ACCESS_TOKEN_KEY);
 
 if (empty($token_info))
 {
 $query = ['grant_type' => 'client_credential', 'appid' => $this->_app_id, 'secret' => $this->_app_secret];
 
 $token_url = $this->_token_url.'?'.http_build_query($query);
 
 $response = curlSend($token_url, NULL, 'get');

 if (isJson($response['result']))
 {
 $token_info = json_decode($response['result'], true);
 
 if (isset($token_info['errcode']))
 {
 // 返回结果中没有access_token
 return $this;
 }
 
 $token_info['expires_in'] = time() + $token_info['expires_in'] - 200;
 
 $this->cache->redis->save(self::ACCESS_TOKEN_KEY, json_encode($token_info), 7000);
 
 }else
 {
 // 请求返回结果不是json 这种情况概率非常低，除非微信服务器挂了
 return $this;
 }
 }else
 {
 $token_info = json_decode($token_info, true);
 
 //看看access_token是否过期
 if ($token_info['expires_in'] <= time())
 {
 $this->cache->redis->delete(self::ACCESS_TOKEN_KEY);
 return $this->getToken();
 }
 }
 
 $this->_accress_token = $token_info['access_token'];
 
 return $this;
 }
 
 /**
 * 获取api_ticket
 * @return WechartService
 */
 public function getTicket()
 {
 $ticket_info = $this->cache->redis->get(self::JSAPI_TICKET_KEY);
 
 if (empty($ticket_info))
 {
 $query = ['access_token' => $this->_accress_token, 'type' => 'jsapi'];
 $url = $this->_ticket_url.'?'. http_build_query($query);
 
 $response = curlSend($url, NULL, 'get');
 
 if (isJson($response['result']))
 {
 $ticket_info = json_decode($response['result'], true);
 
 if ($ticket_info['errcode'] != 0)
 {
 // 返回结果中没有access_token
 return $this;
 }
 
 $ticket_info['expires_in'] = time() + $ticket_info['expires_in'] - 200;
 
 $this->cache->redis->save(self::JSAPI_TICKET_KEY, json_encode($ticket_info), 7000);
 }else{
 
 // 请求返回结果不是json 这种情况概率非常低，除非微信服务器挂了
 return $this;
 }
 
 }else
 {
 $ticket_info = json_decode($ticket_info, true);
 
 //看看access_token是否过期
 if ($ticket_info['expires_in'] <= time())
 {
 $this->cache->redis->delete(self::JSAPI_TICKET_KEY);
 return $this->getTicket();
 }
 }
 
 $this->_api_ticket = $ticket_info['ticket'];
 
 return $this;
 
 }
 
 /**
 * 获取分享信息
 * @return multitype:NULL string Ambigous <string, number, Ambigous <string, mixed>>
 */
 public function getSharInfo()
 {
 
 $this->getToken()->getTicket();
 $noncestr = randNum(16, 9);
 $url = (isHttps() ? 'https://' : 'http://' ).$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI'];
 //注意param中key排列顺序，需按 ASCII 码从小到大排序
 $params = [
 'jsapi_ticket' => $this->_api_ticket,
 'noncestr' => $noncestr,
 'timestamp' => time(),
 'url' => $url,
 ];
 
 ksort($params, SORT_STRING);
 
 $string = http_build_query( $params );
 $string = urldecode( $string );
 $signature = sha1( $string );
 
 $data = ['appId'=>$this->_app_id, 'timestamp'=>$params['timestamp'], 'nonceStr'=>$noncestr, 'signature'=>$signature];
 return $data;
 }
 
 /* 是否是微信环境
 *
 * return bool
 */
 public function isWeixin(){
 $agent = strtolower($_SERVER['HTTP_USER_AGENT']);
 $is_weixin = (stripos($agent, 'micromessenger') !== false);
 return $is_weixin;
 }
 
}