decode user_sid fix

app/extend/helper.js

@@ -432,6 +432,25 @@ module.exports = {
       formatUrl = baseUrl + '/' + url;
     }
     return formatUrl;
+  },
+
+  decodeUserSid(code) {
+
+    const rand = 'OU1WjLvZCrRJ7Yo0gE2XDjuuaSAUuaH1bhHPuMymcdfEeKz0igRhXQkMuLTm1';
+    const begin = code.slice(0, 1);
+    let rtn = '';
+    const codelen = rand.slice(0, 11);
+    const codenums = rand.slice(11, 23);
+    let len = codelen.indexOf(begin);
+    if (len > -1) {
+      len++;
+      const arrnums = code.slice(-len).split('');
+      for (const v of arrnums) {
+        rtn += String(codenums.indexOf(v));
+      }
+    }
+
+    return parseInt(rtn) >> 2;
   }
 
 };