Huxley
b4ab864f80
- Add TokenType enum and include in Claims struct - GenerateRefreshToken now creates tokens with TokenRefresh type - AuthRequired middleware rejects refresh tokens - AuthService.Refresh validates token type - Tests verify type validation
89 lines
2.2 KiB
Go
89 lines
2.2 KiB
Go
package auth
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import (
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"fmt"
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"time"
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"github.com/golang-jwt/jwt/v5"
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"github.com/google/uuid"
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)
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// TokenType distinguishes access tokens from refresh tokens.
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type TokenType string
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const (
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TokenAccess TokenType = "access"
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TokenRefresh TokenType = "refresh"
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)
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// Claims represents the JWT claims for MyGO tokens.
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type Claims struct {
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jwt.RegisteredClaims
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UserID string `json:"uid"`
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Type TokenType `json:"type"`
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}
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// GenerateAccessToken creates a signed JWT access token for a user.
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func GenerateAccessToken(userID string, secret []byte, ttl time.Duration) (string, error) {
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now := time.Now()
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claims := Claims{
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RegisteredClaims: jwt.RegisteredClaims{
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ID: uuid.NewString(),
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IssuedAt: jwt.NewNumericDate(now),
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ExpiresAt: jwt.NewNumericDate(now.Add(ttl)),
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},
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UserID: userID,
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Type: TokenAccess,
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}
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token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
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signed, err := token.SignedString(secret)
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if err != nil {
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return "", fmt.Errorf("sign token: %w", err)
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}
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return signed, nil
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}
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// GenerateRefreshToken creates a signed JWT refresh token for a user.
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func GenerateRefreshToken(userID string, secret []byte, ttl time.Duration) (string, error) {
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now := time.Now()
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claims := Claims{
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RegisteredClaims: jwt.RegisteredClaims{
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ID: uuid.NewString(),
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IssuedAt: jwt.NewNumericDate(now),
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ExpiresAt: jwt.NewNumericDate(now.Add(ttl)),
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},
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UserID: userID,
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Type: TokenRefresh,
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}
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token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
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signed, err := token.SignedString(secret)
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if err != nil {
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return "", fmt.Errorf("sign token: %w", err)
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}
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return signed, nil
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}
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// ParseToken validates and parses a JWT token string.
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func ParseToken(tokenString string, secret []byte) (*Claims, error) {
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token, err := jwt.ParseWithClaims(tokenString, &Claims{}, func(t *jwt.Token) (any, error) {
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if _, ok := t.Method.(*jwt.SigningMethodHMAC); !ok {
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return nil, fmt.Errorf("unexpected signing method: %v", t.Header["alg"])
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}
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return secret, nil
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})
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if err != nil {
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return nil, fmt.Errorf("parse token: %w", err)
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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, fmt.Errorf("invalid token claims")
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}
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return claims, nil
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}
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