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token.go
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token.go
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package token
import (
"time"
"github.com/dgrijalva/jwt-go"
)
type Config struct {
JWK []byte
ValidSignature bool
}
type MyCustomClaims struct {
Admin bool `json:"admin"`
jwt.StandardClaims
}
func New(jwk []byte, valid bool) *Config {
return &Config{
JWK: jwk,
ValidSignature: valid,
}
}
func (c *Config) Create(audience, issuer string, admin bool, ttl int) (string, error) {
now := time.Now()
expireMinutes := 5
if admin {
expireMinutes = 1440
if ttl > 0 {
expireMinutes = ttl
}
}
claims := MyCustomClaims{
admin,
jwt.StandardClaims{
Audience: audience,
ExpiresAt: now.Add(time.Minute * time.Duration(expireMinutes)).Unix(),
IssuedAt: now.Unix(),
Issuer: issuer,
},
}
token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
ss, err := token.SignedString(c.JWK)
if err != nil {
return "", err
}
return ss, nil
}
func (c *Config) GetToken(tokenString string) (*jwt.Token, error) {
token, err := jwt.Parse(tokenString, func(token *jwt.Token) (interface{}, error) {
// if _, ok := token.Method.(*jwt.SigningMethodHS256); !ok {
// return nil, fmt.Errorf("Unexpected signing method: %v", token.Header["alg"])
// }
return c.JWK, nil
})
if c.ValidSignature {
if err != nil {
return nil, err
}
}
return token, nil
}
func (c *Config) GetStandardClaims(tokenString string) (jwt.StandardClaims, error) {
token, err := c.GetToken(tokenString)
if err != nil {
return jwt.StandardClaims{}, err
}
claims := token.Claims.(jwt.MapClaims)
cl := jwt.StandardClaims{}
if v, ok := claims["aud"]; ok {
cl.Audience = v.(string)
}
if v, ok := claims["exp"]; ok {
cl.ExpiresAt = int64(v.(float64))
}
if v, ok := claims["jti"]; ok {
cl.Id = v.(string)
}
if v, ok := claims["iat"]; ok {
cl.IssuedAt = int64(v.(float64))
}
if v, ok := claims["iss"]; ok {
cl.Issuer = v.(string)
}
if v, ok := claims["nbf"]; ok {
cl.NotBefore = int64(v.(float64))
}
if v, ok := claims["sub"]; ok {
cl.Subject = v.(string)
}
return cl, nil
}
func (c *Config) GetCustomClaims(tokenString string) (MyCustomClaims, error) {
token, err := c.GetToken(tokenString)
if err != nil {
return MyCustomClaims{}, err
}
claims := token.Claims.(jwt.MapClaims)
admin := false
if v, ok := claims["admin"]; ok {
admin = v.(bool)
}
stdclaims, err := c.GetStandardClaims(tokenString)
if err != nil {
return MyCustomClaims{}, err
}
mcc := MyCustomClaims{admin, stdclaims}
return mcc, nil
}