102 lines
2.5 KiB
Go
102 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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"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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)
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// JWTManager handles JWT token operations
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type JWTManager struct {
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secretKey string
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accessExpiry time.Duration
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refreshExpiry time.Duration
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}
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// NewJWTManager creates a new JWT manager
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func NewJWTManager(secretKey string, accessExpiry, refreshExpiry time.Duration) *JWTManager {
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return &JWTManager{
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secretKey: secretKey,
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accessExpiry: accessExpiry,
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refreshExpiry: refreshExpiry,
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}
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}
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// CustomClaims contains the claims we want in our tokens
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type CustomClaims struct {
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UserID string `json:"user_id"`
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Email string `json:"email"`
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Role string `json:"role"`
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TokenType string `json:"token_type"` // access or refresh
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jwt.RegisteredClaims
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}
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// GenerateAccessToken creates a new access token
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func (m *JWTManager) GenerateAccessToken(userID, email, role string) (string, error) {
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claims := CustomClaims{
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UserID: userID,
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Email: email,
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Role: role,
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TokenType: "access",
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RegisteredClaims: jwt.RegisteredClaims{
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ExpiresAt: jwt.NewNumericDate(time.Now().Add(m.accessExpiry)),
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IssuedAt: 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([]byte(m.secretKey))
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}
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// GenerateRefreshToken creates a new refresh token
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func (m *JWTManager) GenerateRefreshToken(userID, email, role string) (string, error) {
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claims := CustomClaims{
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UserID: userID,
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Email: email,
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Role: role,
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TokenType: "refresh",
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RegisteredClaims: jwt.RegisteredClaims{
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ExpiresAt: jwt.NewNumericDate(time.Now().Add(m.refreshExpiry)),
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IssuedAt: 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([]byte(m.secretKey))
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}
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// ValidateToken validates a token and returns the claims
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func (m *JWTManager) ValidateToken(tokenString string) (*CustomClaims, error) {
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token, err := jwt.ParseWithClaims(
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tokenString,
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&CustomClaims{},
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func(token *jwt.Token) (interface{}, error) {
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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 []byte(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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return nil, ErrInvalidToken
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}
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claims, ok := token.Claims.(*CustomClaims)
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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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