implement jwt claims

core/jwt_claims.go

@@ -0,0 +1,93 @@
+package core
+
+import (
+	"errors"
+	"fmt"
+	"github.com/golang-jwt/jwt/v5"
+	"time"
+)
+
+type JwtTokens struct {
+	AccessToken  string `json:"access_token"`
+	RefreshToken string `json:"refresh_token"`
+}
+
+const (
+	accessTokenExp  = 5 * time.Minute
+	refreshTokenExp = 30 * 24 * time.Hour
+)
+
+var secret = []byte("your-secret-key")
+
+func NewJwtTokens(username string) (JwtTokens, error) {
+	accessClaims := NewAccessClaim(username)
+
+	refreshClaims := jwt.RegisteredClaims{
+		Subject:   username,
+		ExpiresAt: jwt.NewNumericDate(time.Now().Add(refreshTokenExp)),
+	}
+
+	accessJwt, err := EncodeAndSignClaims(accessClaims)
+	if err != nil {
+		return JwtTokens{}, err
+	}
+	refreshJwt, err := EncodeAndSignClaims(refreshClaims)
+
+	if err != nil {
+		return JwtTokens{}, err
+	}
+	return JwtTokens{
+		AccessToken:  accessJwt,
+		RefreshToken: refreshJwt,
+	}, nil
+}
+
+func NewAccessClaim(username string) jwt.RegisteredClaims {
+	return jwt.RegisteredClaims{
+		Subject:   username,
+		ExpiresAt: jwt.NewNumericDate(time.Now().Add(accessTokenExp)),
+	}
+}
+
+func EncodeAndSignClaims(claims jwt.RegisteredClaims) (string, error) {
+	token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
+	return token.SignedString(secret)
+}
+
+func ParseRefreshToken(refreshToken string) (*jwt.RegisteredClaims, error) {
+	token, err := jwt.ParseWithClaims(refreshToken, &jwt.RegisteredClaims{}, func(token *jwt.Token) (interface{}, error) {
+		return secret, nil
+	})
+	if err != nil {
+		return nil, fmt.Errorf("error parsing refresh token: %w", err)
+	}
+	claims, ok := token.Claims.(*jwt.RegisteredClaims)
+	if !ok {
+		return nil, errors.New("unable to parse claims")
+	}
+	return claims, nil
+}
+
+func ParseAccessToken(accessToken string) (*jwt.RegisteredClaims, error) {
+	token, err := jwt.ParseWithClaims(accessToken, &jwt.RegisteredClaims{}, func(token *jwt.Token) (interface{}, error) {
+		return secret, nil
+	})
+	if err != nil {
+		return nil, fmt.Errorf("error parsing refresh token: %w", err)
+	}
+	claims, ok := token.Claims.(*jwt.RegisteredClaims)
+	if !ok {
+		return nil, errors.New("unable to parse claims")
+	}
+	return claims, nil
+}
+
+func ClaimExpired(claims jwt.RegisteredClaims) error {
+	if claims.ExpiresAt == nil {
+		return errors.New("claim exp is nil")
+	}
+	if claims.ExpiresAt.Time.Before(time.Now()) {
+		return nil
+	}
+	return errors.New("claim expired")
+}