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jwt.go
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jwt.go
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package jwt
import (
"github.com/baasapi/baasapi/api"
"fmt"
"time"
"github.com/dgrijalva/jwt-go"
"github.com/gorilla/securecookie"
)
// Service represents a service for managing JWT tokens.
type Service struct {
secret []byte
}
type claims struct {
UserID int `json:"id"`
Username string `json:"username"`
Role int `json:"role"`
jwt.StandardClaims
}
// NewService initializes a new service. It will generate a random key that will be used to sign JWT tokens.
func NewService() (*Service, error) {
secret := securecookie.GenerateRandomKey(32)
if secret == nil {
return nil, baasapi.ErrSecretGeneration
}
service := &Service{
secret,
}
return service, nil
}
// GenerateToken generates a new JWT token.
func (service *Service) GenerateToken(data *baasapi.TokenData) (string, error) {
expireToken := time.Now().Add(time.Hour * 72).Unix()
cl := claims{
int(data.ID),
data.Username,
int(data.Role),
jwt.StandardClaims{
ExpiresAt: expireToken,
},
}
token := jwt.NewWithClaims(jwt.SigningMethodHS256, cl)
signedToken, err := token.SignedString(service.secret)
if err != nil {
return "", err
}
return signedToken, nil
}
// ParseAndVerifyToken parses a JWT token and verify its validity. It returns an error if token is invalid.
func (service *Service) ParseAndVerifyToken(token string) (*baasapi.TokenData, error) {
parsedToken, err := jwt.ParseWithClaims(token, &claims{}, func(token *jwt.Token) (interface{}, error) {
if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
msg := fmt.Errorf("Unexpected signing method: %v", token.Header["alg"])
return nil, msg
}
return service.secret, nil
})
if err == nil && parsedToken != nil {
if cl, ok := parsedToken.Claims.(*claims); ok && parsedToken.Valid {
tokenData := &baasapi.TokenData{
ID: baasapi.UserID(cl.UserID),
Username: cl.Username,
Role: baasapi.UserRole(cl.Role),
}
return tokenData, nil
}
}
return nil, baasapi.ErrInvalidJWTToken
}