258资源分享网

微信小程序分享群获取群id时后端接口返回“微信AES解密失败”，后来定位到原因是服务端用于解密的session_key失效。用户获取到openID存在缓存后，就不会每次login获取登录态了，这样会导致登录态失效，即后端维护的session_key失效。分享群后获取的加密信息是老的session_key+openId构成，服务端解密时的session_key要和分享前一致。

在需要获取openGid的页面：

app.getOpenId(this.route, this.data.pageOptions).then((res) => { wx.login({ success(res) { // 刷新服务端session_key api.ajax('GET', api.config_url.refreshWxUserSessionKey, { appId: api.appId, code: res.code, }).then(res => { const { status, message } = res.data; if (status) { console.log('登录态刷新成功'); } }, res => { }); } }) // 其他业务逻辑

app.js

//获取openGid getOpenGid(shareTicket, status, callback) { var self = this; wx.getShareInfo({ shareTicket: shareTicket, complete(res) { var param = { "iv": res.iv, "encryptedData": res.encryptedData, "appId": self.appId, "openId": wx.getStorageSync("openId") }; self.getAesDecryptData(callback, param); } }); }, getAesDecryptData(callback, param) { const self = this; this.ajax('POST', this.config_url.aesDecryptData, param).then(res => { console.log(res); if (res.data.entry && res.data.entry.openGId) { wx.setStorageSync("openGId", res.data.entry.openGId); callback() && callback(); } else { console.log('获取群id失败'); wx.login({ success(res) { self.ajax('GET', self.config_url.refreshWxUserSessionKey, { appId: self.appId, code: res.code, }).then(res => { const { status, message } = res.data; if (status) { console.log('登录态刷新成功'); } }, res => { }); } }); wx.removeStorageSync('openGId'); } }); },