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jwt.go
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jwt.go
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package jwtsession
import (
"fmt"
"time"
"github.com/dgrijalva/jwt-go"
)
func NewJWTSigner(key []byte, ttl time.Duration) *JWTSigner {
return &JWTSigner{
key: key,
sessionTTL: ttl,
}
}
func (signer *JWTSigner) SignUser(identifier string) (string, error) {
if len(identifier) == 0 {
return "", errEmptyIdentifier
}
if len(signer.key) == 0 {
return "", errInvalidKey
}
token := jwt.NewWithClaims(jwt.SigningMethodHS256, &claim{
User: identifier,
StandardClaims: jwt.StandardClaims{
ExpiresAt: time.Now().Add(signer.sessionTTL).Unix(),
},
})
return token.SignedString(signer.key)
}
func (signer *JWTSigner) Validate(token string) (string, error) {
claims := &claim{}
_, err := jwt.ParseWithClaims(token, claims, signer.keyFunc)
if err != nil {
return "", fmt.Errorf("jwt validate error: %s", err.Error())
}
return claims.User, nil
}
func (signer *JWTSigner) keyFunc(token *jwt.Token) (interface{}, error) {
return []byte(signer.key), nil
}