add mongodb access lib

server-api/libs/mongo_model.js

@@ -0,0 +1,18 @@
+const mongoose = require('mongoose');
+
+const tokenSchema = mongoose.Schema({
+    object: Object,
+    expire: {
+        type: Number,
+        default: Date.now
+    }
+});
+// tokenSchema.method.clearExpire = function(cb) {
+//     return this.model('token').remove({ expire: { $lte: Date.now() } }, cb);
+// }
+
+const token = mongoose.model('token', tokenSchema, 'token');
+
+module.exports = {
+    token
+}