wiki/id.go

/*
 * Wiki - A wiki with editor
 * Copyright (c) 2021 Peter Stuifzand
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package main

import (
	"encoding/json"
	"fmt"
	"math/rand"
	"strconv"
	"time"
)

type ID struct {
	StrID  string
	WasInt bool
}

func (id *ID) UnmarshalJSON(data []byte) error {
	var intID int
	err := json.Unmarshal(data, &intID)
	if err == nil {
		*id = ID{strconv.FormatInt(int64(intID), 10), true}
		return nil
	}

	var strID string
	err = json.Unmarshal(data, &strID)
	if err == nil {
		*id = ID{strID, false}
		return nil
	}

	return fmt.Errorf("could not unmarshal %q as an int or string", data)
}

func (id *ID) NewID() string {
	if id.WasInt {
		l := time.Now().UnixNano()
		r := rand.Uint64()
		return fmt.Sprintf("_%d_%d", l, r)
	} else {
		return id.StrID
	}
}