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81 lines
1.4 KiB
Go
81 lines
1.4 KiB
Go
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/go-co-op/gocron"
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"github.com/pagefaultgames/pokerogue-server/db"
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)
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const secondsPerDay = 60 * 60 * 24
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var (
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scheduler = gocron.NewScheduler(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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err = recordNewRun()
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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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scheduler.Every(1).Day().At("00:00").Do(recordNewRun())
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scheduler.StartAsync()
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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 recordNewRun() error {
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err := db.TryAddDailyRun(Seed())
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if err != nil {
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return err
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}
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return nil
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}
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