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106 lines
2.3 KiB
Go
106 lines
2.3 KiB
Go
/*
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Copyright (C) 2024 Pagefault Games
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Affero General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package daily
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import (
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"crypto/md5"
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"crypto/rand"
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"encoding/base64"
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"encoding/binary"
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"fmt"
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"log"
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"os"
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"time"
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"github.com/pagefaultgames/rogueserver/db"
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"github.com/robfig/cron/v3"
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)
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const secondsPerDay = 60 * 60 * 24
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var (
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scheduler = cron.New(cron.WithLocation(time.UTC))
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secret []byte
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)
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func Init() error {
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var err error
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secret, err = os.ReadFile("secret.key")
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if err != nil {
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if !os.IsNotExist(err) {
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return fmt.Errorf("failed to read daily seed secret: %s", err)
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}
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newSecret := make([]byte, 32)
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_, err := rand.Read(newSecret)
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if err != nil {
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return fmt.Errorf("failed to generate daily seed secret: %s", err)
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}
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err = os.WriteFile("secret.key", newSecret, 0400)
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if err != nil {
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return fmt.Errorf("failed to write daily seed secret: %s", err)
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}
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secret = newSecret
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}
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seed, err := recordNewDaily()
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if err != nil {
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log.Print(err)
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}
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log.Printf("Daily Run Seed: %s", seed)
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_, err = scheduler.AddFunc("@daily", func() {
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time.Sleep(time.Second)
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seed, err = recordNewDaily()
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log.Printf("Daily Run Seed: %s", seed)
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if err != nil {
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log.Printf("error while recording new daily: %s", err)
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}
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})
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if err != nil {
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return err
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}
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scheduler.Start()
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return nil
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}
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func Seed() string {
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return base64.StdEncoding.EncodeToString(deriveSeed(time.Now().UTC()))
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}
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func deriveSeed(seedTime time.Time) []byte {
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day := make([]byte, 8)
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binary.BigEndian.PutUint64(day, uint64(seedTime.Unix()/secondsPerDay))
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hashedSeed := md5.Sum(append(day, secret...))
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return hashedSeed[:]
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}
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func recordNewDaily() (string, error) {
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return db.TryAddDailyRun(Seed())
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}
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