58 lines
1.7 KiB
Go
58 lines
1.7 KiB
Go
// Package auth provides cryptographic core for authentication.
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package auth
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import (
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"errors"
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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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// ErrInvalidToken is returned when a token is invalid or cannot be parsed.
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var ErrInvalidToken = errors.New("auth: invalid token")
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// TokenManager handles issuing and parsing JWT access tokens.
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type TokenManager struct {
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secret []byte
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}
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// NewTokenManager creates a TokenManager using the provided secret key.
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func NewTokenManager(secret string) *TokenManager {
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return &TokenManager{secret: []byte(secret)}
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}
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// IssueAccessToken issues a signed JWT access token for the given userID with TTL.
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func (t *TokenManager) IssueAccessToken(userID int64, ttl time.Duration) (string, error) {
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now := time.Now()
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claims := jwt.RegisteredClaims{
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Subject: strconv.FormatInt(userID, 10),
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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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token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
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return token.SignedString(t.secret)
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}
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// ParseAccessToken parses and validates the JWT access token, returning the userID.
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func (t *TokenManager) ParseAccessToken(tokenStr string) (int64, error) {
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token, err := jwt.ParseWithClaims(tokenStr, &jwt.RegisteredClaims{}, func(token *jwt.Token) (interface{}, error) {
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if token.Method != jwt.SigningMethodHS256 {
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return nil, ErrInvalidToken
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}
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return t.secret, nil
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})
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if err != nil {
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return 0, ErrInvalidToken
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}
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claims, ok := token.Claims.(*jwt.RegisteredClaims)
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if !ok || !token.Valid {
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return 0, ErrInvalidToken
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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 0, ErrInvalidToken
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}
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return userID, nil
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}
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