upload

pkg/utils/subscriber_token.go

@@ -0,0 +1,54 @@
+package utils
+
+import (
+	"os"
+	"time"
+
+	"github.com/golang-jwt/jwt/v5"
+)
+
+type SubscriberTokenClaims struct {
+	Email string `json:"email"`
+	jwt.RegisteredClaims
+}
+
+// GenerateSubscriberToken creates a signed token for a subscriber email, expires in `ttl` minutes
+func GenerateSubscriberToken(email string, ttlMinutes int) (string, error) {
+	if ttlMinutes <= 0 {
+		ttlMinutes = 60
+	}
+	now := time.Now()
+	claims := &SubscriberTokenClaims{
+		Email: email,
+		RegisteredClaims: jwt.RegisteredClaims{
+			IssuedAt:  jwt.NewNumericDate(now),
+			ExpiresAt: jwt.NewNumericDate(now.Add(time.Duration(ttlMinutes) * time.Minute)),
+			Issuer:    "fotbal-club",
+		},
+	}
+
+	token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
+	return token.SignedString([]byte(getJWTSecret()))
+}
+
+// ParseSubscriberToken validates and returns the email embedded in the token
+func ParseSubscriberToken(tokenString string) (string, error) {
+	token, err := jwt.ParseWithClaims(tokenString, &SubscriberTokenClaims{}, func(token *jwt.Token) (interface{}, error) {
+		return []byte(getJWTSecret()), nil
+	})
+	if err != nil {
+		return "", err
+	}
+	if claims, ok := token.Claims.(*SubscriberTokenClaims); ok && token.Valid {
+		return claims.Email, nil
+	}
+	return "", jwt.ErrTokenMalformed
+}
+
+func getJWTSecret() string {
+	s := os.Getenv("JWT_SECRET")
+	if s == "" {
+		return "default-secret-key-change-in-production"
+	}
+	return s
+}