65 lines
1.5 KiB
Go
65 lines
1.5 KiB
Go
package auth
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import (
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"errors"
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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 expired")
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)
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// Claims represents JWT claims
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type Claims struct {
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UserID string `json:"user_id"`
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Role string `json:"role"`
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jwt.RegisteredClaims
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}
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// GenerateToken generates a JWT token for a user
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func (s *Service) GenerateToken(userID, role string) (string, error) {
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expirationTime := time.Now().Add(24 * time.Hour) // Token valid for 24 hours
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claims := &Claims{
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UserID: userID,
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Role: role,
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RegisteredClaims: jwt.RegisteredClaims{
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ExpiresAt: jwt.NewNumericDate(expirationTime),
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IssuedAt: jwt.NewNumericDate(time.Now()),
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NotBefore: jwt.NewNumericDate(time.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(s.jwtSecret)
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}
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// ValidateToken validates a JWT token and returns the claims
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func (s *Service) ValidateToken(tokenString string) (*Claims, error) {
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token, err := jwt.ParseWithClaims(tokenString, &Claims{}, func(token *jwt.Token) (interface{}, error) {
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if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
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return nil, errors.New("unexpected signing method")
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}
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return s.jwtSecret, nil
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})
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if err != nil {
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// Check if token is expired
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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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// All other errors are invalid tokens
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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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