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81 lines
1.4 KiB
Go

package daily
import (
"crypto/md5"
"crypto/rand"
"encoding/base64"
"encoding/binary"
"fmt"
"log"
"os"
"time"
"github.com/go-co-op/gocron"
"github.com/pagefaultgames/pokerogue-server/db"
)
const secondsPerDay = 60 * 60 * 24
var (
scheduler = gocron.NewScheduler(time.UTC)
secret []byte
)
func Init() error {
var err error
secret, err = os.ReadFile("secret.key")
if err != nil {
if !os.IsNotExist(err) {
return fmt.Errorf("failed to read daily seed secret: %s", err)
}
newSecret := make([]byte, 32)
_, err := rand.Read(newSecret)
if err != nil {
return fmt.Errorf("failed to generate daily seed secret: %s", err)
}
err = os.WriteFile("secret.key", newSecret, 0400)
if err != nil {
return fmt.Errorf("failed to write daily seed secret: %s", err)
}
secret = newSecret
}
err = recordNewDaily()
if err != nil {
log.Print(err)
}
log.Printf("Daily Run Seed: %s", Seed())
scheduler.Every(1).Day().At("00:00").Do(recordNewDaily())
scheduler.StartAsync()
return nil
}
func Seed() string {
return base64.StdEncoding.EncodeToString(deriveSeed(time.Now().UTC()))
}
func deriveSeed(seedTime time.Time) []byte {
day := make([]byte, 8)
binary.BigEndian.PutUint64(day, uint64(seedTime.Unix()/secondsPerDay))
hashedSeed := md5.Sum(append(day, secret...))
return hashedSeed[:]
}
func recordNewDaily() error {
err := db.TryAddDailyRun(Seed())
if err != nil {
return err
}
return nil
}