106 lines
2.5 KiB
Go
106 lines
2.5 KiB
Go
package auth
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import (
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"errors"
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"fmt"
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"os"
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"strconv"
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"time"
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"github.com/golang-jwt/jwt/v5"
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)
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var (
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ErrInvalidToken = errors.New("invalid token")
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ErrExpiredToken = errors.New("token has expired")
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ErrInvalidSignature = errors.New("invalid token signature")
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ErrMissingClaims = errors.New("missing required claims")
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)
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// Claims represents the JWT claims structure
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type Claims struct {
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Email string `json:"email"`
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jwt.RegisteredClaims
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}
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type JWTManager struct {
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secretKey []byte
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tokenDuration time.Duration
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}
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func NewJWTManager(secretKey string, tokenDuration time.Duration) *JWTManager {
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return &JWTManager{
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secretKey: []byte(secretKey),
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tokenDuration: tokenDuration,
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}
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}
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// GenerateToken creates a new JWT token for a user
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func (m *JWTManager) GenerateToken(userID int64, email string) (string, error) {
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claims := Claims{
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Email: email,
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RegisteredClaims: jwt.RegisteredClaims{
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Subject: strconv.FormatInt(userID, 10),
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ExpiresAt: jwt.NewNumericDate(time.Now().Add(m.tokenDuration)),
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IssuedAt: jwt.NewNumericDate(time.Now()),
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NotBefore: jwt.NewNumericDate(time.Now()),
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Issuer: os.Getenv("JWT_ISSUER"),
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},
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}
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token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
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tokenString, err := token.SignedString(m.secretKey)
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if err != nil {
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return "", fmt.Errorf("failed to sign token: %w", err)
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}
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return tokenString, nil
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}
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// ValidateToken validates the JWT token and returns the claims
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func (m *JWTManager) ValidateToken(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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// Verify signing method
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if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
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return nil, fmt.Errorf("unexpected signing method: %v", token.Header["alg"])
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}
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return m.secretKey, nil
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},
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)
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if err != nil {
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if errors.Is(err, jwt.ErrTokenExpired) {
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return nil, ErrExpiredToken
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}
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if errors.Is(err, jwt.ErrSignatureInvalid) {
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return nil, ErrInvalidSignature
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}
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return nil, ErrInvalidToken
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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, ErrInvalidToken
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}
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return claims, nil
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}
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// RefreshToken generates a new token from an existing valid token
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func (m *JWTManager) RefreshToken(tokenString string) (string, error) {
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claims, err := m.ValidateToken(tokenString)
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if err != nil {
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return "", err
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}
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userId, err := strconv.ParseInt(claims.Subject, 10, 64)
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if err != nil {
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return "", err
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}
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return m.GenerateToken(userId, claims.Email)
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}
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