129 lines
2.9 KiB
Go
129 lines
2.9 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/FernandoJVideira/simple_bank/internal/config"
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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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// JWTMaker is a JSON Web Token maker
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type JWTMaker struct {
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secretKey string
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config config.Config
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}
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func NewJWTClaims(payload *Payload, config config.Config) jwt.Claims {
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return &jwt.MapClaims{
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"iat": jwt.NewNumericDate(payload.IssuedAt),
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"iss": config.TokenISS,
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"exp": jwt.NewNumericDate(payload.ExpiredAt),
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"nbf": jwt.NewNumericDate(payload.IssuedAt),
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"aud": []string{config.TokenAUD},
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"sub": payload.Username,
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"role": payload.Role,
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"jti": payload.ID.String(),
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}
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}
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// NewJWTMaker creates a new JWTMaker
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func NewJWTMaker(config config.Config) (Maker, error) {
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if len(config.TokenKey) < config.MinTokenSize {
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return nil, fmt.Errorf("invalid key size: must be at least %d characters", config.MinTokenSize)
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}
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return &JWTMaker{secretKey: config.TokenKey, config: config}, nil
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}
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func (maker *JWTMaker) CreateToken(username string, role string, duration time.Duration) (string, *Payload, error) {
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payload, err := NewPayload(username, role, duration)
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if err != nil {
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return "", nil, err
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}
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jwtToken := jwt.NewWithClaims(jwt.SigningMethodHS256, NewJWTClaims(payload, maker.config))
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signedString, err := jwtToken.SignedString([]byte(maker.secretKey))
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return signedString, payload, err
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}
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func (maker *JWTMaker) VerifyToken(token string) (*Payload, error) {
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payloadClaims := jwt.MapClaims{}
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keyFunc := func(token *jwt.Token) (any, error) {
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_, ok := token.Method.(*jwt.SigningMethodHMAC)
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if !ok {
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return nil, ErrInvalidToken
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}
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return []byte(maker.secretKey), nil
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}
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jwtToken, err := jwt.ParseWithClaims(token, payloadClaims, keyFunc)
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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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} else if errors.Is(err, ErrInvalidToken) {
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return nil, ErrInvalidToken
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} else {
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return nil, err
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}
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}
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payloadClaims, ok := jwtToken.Claims.(jwt.MapClaims)
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if !ok {
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return nil, ErrInvalidToken
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}
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payload, err := parseTypes(payloadClaims)
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if err != nil {
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return nil, err
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}
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return payload, nil
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}
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func parseTypes(claims jwt.MapClaims) (*Payload, error) {
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// Safe type assertions with error checking
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jti, ok := claims["jti"].(string)
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if !ok {
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return nil, ErrInvalidToken
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}
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id, err := uuid.Parse(jti)
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if err != nil {
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return nil, ErrInvalidToken
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}
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username, ok := claims["sub"].(string)
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if !ok {
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return nil, ErrInvalidToken
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}
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role, ok := claims["role"].(string)
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if !ok {
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return nil, ErrInvalidToken
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}
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// Parse numeric dates
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nbf, ok := claims["nbf"].(float64)
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if !ok {
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return nil, ErrInvalidToken
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}
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exp, ok := claims["exp"].(float64)
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if !ok {
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return nil, ErrInvalidToken
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}
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return &Payload{
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ID: id,
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Username: username,
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Role: role,
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IssuedAt: time.Unix(int64(nbf), 0),
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ExpiredAt: time.Unix(int64(exp), 0),
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}, nil
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}
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