implement JWT tokens, regenerate docs and sqlc

api/utils/jwt.go

@@ -0,0 +1,48 @@
+package utils
+
+import (
+	"errors"
+	"time"
+
+	"github.com/golang-jwt/jwt/v5"
+)
+
+type Claims struct {
+	UserName string `json:"user_name"`
+	UserMail string `json:"user_mail"`
+	jwt.RegisteredClaims
+}
+
+func GenerateToken(secret, issuer, userID, userName, userMail string, ttl time.Duration) (string, error) {
+	now := time.Now()
+	claims := Claims{
+		UserName: userName,
+		UserMail: userMail,
+		RegisteredClaims: jwt.RegisteredClaims{
+			Subject:   userID,
+			Issuer:    issuer,
+			IssuedAt:  jwt.NewNumericDate(now),
+			ExpiresAt: jwt.NewNumericDate(now.Add(ttl)),
+		},
+	}
+	token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
+	return token.SignedString([]byte(secret))
+}
+
+func ValidateToken(secret string, tokenString string) (*Claims, error) {
+	token, err := jwt.ParseWithClaims(tokenString, &Claims{}, func(t *jwt.Token) (interface{}, error) {
+		if t.Method != jwt.SigningMethodHS256 {
+			return nil, errors.New("unexpected signing method")
+		}
+		return []byte(secret), nil
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	claims, ok := token.Claims.(*Claims)
+	if !ok || !token.Valid {
+		return nil, errors.New("invalid token")
+	}
+	return claims, nil
+}