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jwt.go
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jwt.go
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package security
import (
"fmt"
"time"
jwt "github.com/dgrijalva/jwt-go"
)
const (
JWT_SECRET = "d7830ad5791dsdsds"
JWT_EXP_HOUR = 1
JWT_EXP_MIN = 0
JWT_EXP_SEC = 30
)
//NewToken create a new token
func NewToken(id int, role string) (string, error) {
token := jwt.NewWithClaims(jwt.SigningMethodHS256, jwt.MapClaims{
"role": role,
"userID": id,
"nbf": time.Now().Unix(),
"iat": time.Now().Unix(),
"exp": time.Now().Local().Add(time.Hour*time.Duration(JWT_EXP_HOUR) + time.Minute*time.Duration(JWT_EXP_MIN) + time.Second*time.Duration(JWT_EXP_SEC)).Unix(),
})
// Sign and get the complete encoded token as a string using the secret
sToken, err := token.SignedString([]byte(JWT_SECRET))
if err != nil {
return "", err
}
return sToken, nil
}
//ParseToken parse a token
func ParseToken(tokenString string) (*jwt.Token, error) {
var token *jwt.Token
var err error
token, err = parseHS256(tokenString, token)
if err != nil && err.Error() != "Token is expired" {
token, err = parseHS256(tokenString, token)
}
return token, err
}
func parseHS256(tokenString string, token *jwt.Token) (*jwt.Token, error) {
token, err := jwt.Parse(tokenString, func(token *jwt.Token) (interface{}, error) {
if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
return nil, fmt.Errorf("Unexpected signing method: %v", token.Header["alg"])
}
return []byte(JWT_SECRET), nil
})
return token, err
}
//GetClaims get claims information
func GetClaims(token *jwt.Token) (jwt.MapClaims, error) {
if !token.Valid {
return nil, fmt.Errorf("Unauthorized")
}
err := token.Claims.(jwt.MapClaims).Valid()
if err != nil {
return nil, err
}
return token.Claims.(jwt.MapClaims), nil
}