参考: 微信JS-SDK文档 其中包含有分享朋友圈、发送给朋友的js接口方法。(似乎不知道什么时候就会废弃)
文档中有完整的步骤,麻烦的是第三步:通过config接口注入权限验证配置。其中需要获取 signature(签名) ,必须通过服务器端才行。
本文主要是关于通过服务器获取签名的方法
授权需要获取access_token,然后通过access_token取到jsapi_ticket再进行加密签名。
微信公众号获取的access_token有两种:网页授权access_token、普通access_token,前者仅用于网页端请求用户授权,获取用户信息。后者则广泛用于微信各种接口。本文需要的就是后者:普通access_token。
(另外备注一点:网页授权获取access_token是先获取到(用户同意授权之后的)code,再根据code获取access_token,而普通access_token直接通过appid、appsecret,请求一次就可获得)
主要是获取access_token的,以后再用直接复制就行
<?php class weixin{ private $AppID = ‘‘;//自行填写 private $AppSecret = ‘‘;//自行填写 public $tokenFile = ‘./wxtoken.txt‘;//保存token的文件,有效期2小时 public $jsapiFile = ‘./wxjsapi_ticket.txt‘;//保存 jsapi_ticket的文件,有限期2小时 public $getTokenUrl = ‘https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=APPID&secret=APPSECRET‘; public $getjsapiUrl = ‘https://api.weixin.qq.com/cgi-bin/ticket/getticket?access_token=ACCESS_TOKEN&type=jsapi‘; public function __construct(){ $this->http_type = ((isset($_SERVER[‘HTTPS‘]) && $_SERVER[‘HTTPS‘] == ‘on‘) || (isset($_SERVER[‘HTTP_X_FORWARDED_PROTO‘]) && $_SERVER[‘HTTP_X_FORWARDED_PROTO‘] == ‘https‘)) ? ‘https://‘ : ‘http://‘; } public function index(){ $action = isset($_GET[‘do‘]) ? $_GET[‘do‘] : ‘‘; switch($action){ case ‘ApiJsSignature‘: $ret = $this->ApiJsSignature();//获取分享需要的签名等数据 break; default: echo ‘default‘; break; } } //用于微信分享到朋友圈或给朋友的参数 public function ApiJsSignature(){ $access_token = $this->get_access_token(); $JsapiTicket = $this->get_jsapi_ticket($access_token); $signArr = array( ‘jsapi_ticket‘ => $JsapiTicket, ‘noncestr‘ => $this->str_rand(16), ‘timestamp‘ => time(), ‘url‘ => urldecode($_POST[‘jsapi_url‘]) ); $signStr = ‘jsapi_ticket=‘.$signArr[‘jsapi_ticket‘].‘&noncestr=‘.$signArr[‘noncestr‘].‘×tamp=‘.$signArr[‘timestamp‘].‘&url=‘.$signArr[‘url‘]; //http_build_query()这个方法好像有问题,我使用之后返回的参数缺少字符 $signArr[‘signature‘] = sha1($signStr); $signArr[‘appid‘] = $this->AppID; echo json_encode($signArr); } //第二步获取jsapi_ticket public function get_jsapi_ticket($access_token) { if(!file_exists($this->jsapiFile)) { $JsapiTicket = $this->resetJsapiTicket($access_token); }else{ $fileContent=file_get_contents($this->jsapiFile); $ticketArr = json_decode($fileContent,true); if($ticketArr[‘expires_in‘] < time()) { $JsapiTicket = $this->resetJsapiTicket($access_token); }else{ $JsapiTicket = $ticketArr[‘ticket‘]; } } return $JsapiTicket; } public function resetJsapiTicket($access_token) { $url = str_replace(‘ACCESS_TOKEN‘, $access_token, $this->getjsapiUrl); $ticketJson = $this->curlPost($url); $ticketData = json_decode($ticketJson, true); $ticketData[‘expires_in‘] = $ticketData[‘expires_in‘]+time(); file_put_contents($this->jsapiFile, json_encode($ticketData)); return $ticketData[‘ticket‘]; } //第一步获取access_token public function get_access_token() { if(!file_exists($this->tokenFile)) { $access_token = $this->resetToken();//重置token并写入文件 , 返回token值 }else{ $fileContent=file_get_contents($this->tokenFile); $tokenArr = json_decode($fileContent,true); if($tokenArr[‘expires_in‘] < time()) { $access_token = $this->resetToken(); }else{ $access_token = $tokenArr[‘access_token‘]; } } return $access_token; } //刷新、重置token, 设置获取token事件并将json数据写入文件,最后返回token值, private function resetToken(){ $url = str_replace(‘APPID‘, $this->AppID, $this->getTokenUrl); $url = str_replace(‘APPSECRET‘, $this->AppSecret, $url); $tokenJson = $this->curlPost($url); $tokenData = json_decode($tokenJson, true); $tokenData[‘expires_in‘] = $tokenData[‘expires_in‘]+time(); file_put_contents($this->tokenFile, json_encode($tokenData)); return $tokenData[‘access_token‘]; } //生成随机字符串 public function str_rand($length = 32) { $char = ‘0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ‘; if(!is_int($length) || $length < 0) { return false; } $string = ‘‘; for($i = $length; $i > 0; $i--) { $string .= $char[mt_rand(0, strlen($char) - 1)]; } return $string; } //发送请求 public function curlPost($url, $data = ‘‘) { if (! function_exists(‘curl_init‘)) { return ‘‘; } $ch = curl_init(); curl_setopt($ch, CURLOPT_URL, $url); curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE); curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE); curl_setopt($ch, CURLOPT_POST, 1); curl_setopt($ch, CURLOPT_POSTFIELDS, $data); // curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($data)); // 可提交数组参数 $data = curl_exec($ch); if (! $data) { error_log(curl_error($ch)); } curl_close($ch); return $data; } } // 调用方式: index.php?do=ApiJsSignature $weixin = new weixin(); $weixin->index();