83 lines
1.8 KiB
Go
83 lines
1.8 KiB
Go
// internal/auth/jwt.go
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package auth
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import (
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"crypto/rand"
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"encoding/hex"
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"errors"
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"log"
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"os"
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"time"
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"github.com/golang-jwt/jwt/v5"
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)
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func jwtSecret() []byte {
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secret := os.Getenv("JWT_SECRET")
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if secret == "" {
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b := make([]byte, 32)
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if _, err := rand.Read(b); err != nil {
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log.Printf("FATAL: cannot generate JWT secret: %v", err)
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return []byte("fallback-unsafe-key-change-me")
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}
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secret = hex.EncodeToString(b)
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log.Printf("WARNING: JWT_SECRET not set, generated random key. All tokens invalid on restart.")
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}
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return []byte(secret)
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}
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type Claims struct {
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AccountID uint `json:"account_id"`
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Username string `json:"username"`
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jwt.RegisteredClaims
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}
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func GenerateToken(accountID uint, username string) (string, error) {
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now := time.Now()
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claims := Claims{
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AccountID: accountID,
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Username: username,
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RegisteredClaims: jwt.RegisteredClaims{
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ExpiresAt: jwt.NewNumericDate(now.Add(15 * time.Minute)),
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IssuedAt: jwt.NewNumericDate(now),
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NotBefore: jwt.NewNumericDate(now),
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},
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}
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token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
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return token.SignedString(jwtSecret())
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}
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func GenerateRefreshToken(accountID uint) (string, error) {
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b := make([]byte, 32)
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if _, err := rand.Read(b); err != nil {
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return "", err
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}
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return hex.EncodeToString(b), nil
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}
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func ParseToken(tokenString string) (*Claims, error) {
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token, err := jwt.ParseWithClaims(
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tokenString,
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&Claims{},
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func(token *jwt.Token) (interface{}, error) {
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if token.Method == nil || token.Method.Alg() != jwt.SigningMethodHS256.Alg() {
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return nil, errors.New("unexpected signing method")
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}
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return jwtSecret(), nil
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},
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)
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if err != nil {
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return nil, err
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}
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claims, ok := token.Claims.(*Claims)
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if !ok || !token.Valid {
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return nil, jwt.ErrTokenInvalidClaims
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}
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return claims, nil
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}
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