/
token.go
66 lines (53 loc) · 1.48 KB
/
token.go
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package authenticator
import (
"errors"
"strconv"
"time"
"github.com/dgrijalva/jwt-go"
log "github.com/sirupsen/logrus"
)
// Claim is the struct for the jwt claim
type Claim struct {
Email string
jwt.StandardClaims
}
// GenerateToken creates a JWT with email and expiration time in the payload
func GenerateToken(email string) (string, error) {
err := initRsaKeys()
if err != nil {
return "", errors.New("couldn't init rsa keys")
}
validTime, _ := strconv.ParseInt(goDotEnvVariable("TOKEN_VALID_DURATION"), 10, 64)
// Generate Expiration date
expirationTime := time.Now().Add(time.Duration(validTime) * time.Minute)
claims := &Claim{
Email: email,
StandardClaims: jwt.StandardClaims{
// JWT takes unix timestamps
ExpiresAt: expirationTime.Unix(),
},
}
token := jwt.NewWithClaims(jwt.SigningMethodRS256, claims)
tokenString, err := token.SignedString(rsa.PrivateKey)
if err != nil {
log.Error("error while generating token: ", err)
return "", err
}
return tokenString, nil
}
// DecodeToken decode and validates a token
func DecodeToken(tokenString string) (*jwt.Token, *Claim, error) {
err := initRsaKeys()
if err != nil {
return nil, &Claim{}, errors.New("couldn't init rsa keys")
}
claims := &Claim{}
token, err := jwt.ParseWithClaims(tokenString, claims, func(token *jwt.Token) (interface{}, error) {
return rsa.PublicKey, nil
})
if err != nil {
log.Error("Couldn't parse the token : ", err)
return nil, &Claim{}, err
}
return token, claims, nil
}