package main

import (
        "encoding/json"
        "fmt"
)

type User struct {
        ID int
}

var data = map[string][]byte{
        "ok": []byte(`{"ID": 27}`),
        "fail": []byte(`{"ID": 27`),
}

func GetUser(key string) (*User, error) {
        if jsonStr, ok := data[key]; ok {
                user := &User{}
                err := json.Unmarshal(jsonStr, user)
                if err != nil {
                        return nil, fmt.Errorf("Cant decode json")
                }
                return user, nil
        }
        return nil, fmt.Errorf("User doesnt exist")
}