99 lines
2.5 KiB
Go
99 lines
2.5 KiB
Go
package jwt
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import (
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"acc-server-manager/local/model"
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"crypto/rand"
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"encoding/base64"
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"errors"
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"log"
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"os"
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"time"
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"github.com/golang-jwt/jwt/v4"
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)
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// SecretKey holds the JWT signing key loaded from environment
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var SecretKey []byte
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// Claims represents the JWT claims.
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type Claims struct {
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UserID string `json:"user_id"`
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jwt.RegisteredClaims
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}
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// init initializes the JWT secret key from environment variable
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func Init() {
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jwtSecret := os.Getenv("JWT_SECRET")
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if jwtSecret == "" {
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log.Fatal("JWT_SECRET environment variable is required and cannot be empty")
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}
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// Decode base64 secret if it looks like base64, otherwise use as-is
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if decoded, err := base64.StdEncoding.DecodeString(jwtSecret); err == nil && len(decoded) >= 32 {
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SecretKey = decoded
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} else {
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SecretKey = []byte(jwtSecret)
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}
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// Ensure minimum key length for security
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if len(SecretKey) < 32 {
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log.Fatal("JWT_SECRET must be at least 32 bytes long for security")
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}
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}
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// GenerateSecretKey generates a cryptographically secure random key for JWT signing
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// This is a utility function for generating new secrets, not used in normal operation
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func GenerateSecretKey() string {
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key := make([]byte, 64) // 512 bits
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if _, err := rand.Read(key); err != nil {
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log.Fatal("Failed to generate random key: ", err)
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}
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return base64.StdEncoding.EncodeToString(key)
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}
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// GenerateToken generates a new JWT for a given user.
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func GenerateToken(user *model.User) (string, error) {
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expirationTime := time.Now().Add(24 * time.Hour)
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claims := &Claims{
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UserID: user.ID.String(),
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RegisteredClaims: jwt.RegisteredClaims{
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ExpiresAt: jwt.NewNumericDate(expirationTime),
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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(SecretKey)
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}
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func GenerateTokenWithExpiry(user *model.User, expiry time.Time) (string, error) {
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expirationTime := expiry
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claims := &Claims{
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UserID: user.ID.String(),
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RegisteredClaims: jwt.RegisteredClaims{
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ExpiresAt: jwt.NewNumericDate(expirationTime),
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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(SecretKey)
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}
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// ValidateToken validates a JWT and returns the claims if the token is valid.
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func ValidateToken(tokenString string) (*Claims, error) {
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claims := &Claims{}
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token, err := jwt.ParseWithClaims(tokenString, claims, func(token *jwt.Token) (interface{}, error) {
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return SecretKey, nil
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})
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if err != nil {
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return nil, err
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}
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if !token.Valid {
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return nil, errors.New("invalid token")
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}
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return claims, nil
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}
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