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jwt.go
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jwt.go
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package jwt
import (
"errors"
"fmt"
"time"
"github.com/google/uuid"
jwt "github.com/dgrijalva/jwt-go"
log "github.com/sirupsen/logrus"
)
type Claims map[string]interface{}
func Parse(jwtSecret string, bearerToken string) (Claims, error) {
if jwtSecret == "" {
return nil, errors.New("No jwt secret")
}
// parse the token
parsedToken, err := jwt.Parse(bearerToken, func(token *jwt.Token) (interface{}, error) {
// validate the signing method
if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
return nil, fmt.Errorf("unexpected JWT signing method: %v", token.Header["alg"])
}
// return the signing key
return []byte(jwtSecret), nil
})
if err != nil {
log.Infof("failed to parse JWT \"%s\": %v", bearerToken, err)
return nil, err
}
// validate the token
mapClaims, ok := parsedToken.Claims.(jwt.MapClaims)
if !ok || !parsedToken.Valid {
log.Infof("invalid auth token: %s", bearerToken)
return nil, errors.New("invalid auth token")
}
claims := make(Claims)
for k, v := range mapClaims {
claims[k] = v
}
return claims, nil
}
func Create(tokenIssuer string, jwtSecret string, tokenLifetimeHours int, subjectID string, customClaims Claims) (string, error) {
// ensure the user provided the secret signing key
if jwtSecret == "" {
return "", errors.New("No jwt secret")
}
// create the token
token := jwt.New(jwt.SigningMethodHS256)
// prepare the JWT subject
if subjectID == "" {
subjectID = uuid.New().String()
}
// prepare the TTL of the token
ttl := time.Hour * time.Duration(tokenLifetimeHours)
// set standard token claims
claims := token.Claims.(jwt.MapClaims)
claims["iss"] = tokenIssuer // issuer
claims["aud"] = tokenIssuer // audience
claims["iat"] = time.Now().Unix() // issued at
claims["exp"] = time.Now().Add(ttl).Unix() // expiration time
claims["jti"] = uuid.New().String() // token ID
claims["sub"] = subjectID // subject
// set custom token claims
for k, v := range customClaims {
claims[k] = v
}
// sign the token using the secret key
tokenString, err := token.SignedString([]byte(jwtSecret))
if err != nil {
return "", err
}
// display the token
return tokenString, nil
}