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jwt.go
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jwt.go
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package jwt
import (
"errors"
"fmt"
"time"
jwtlib "github.com/dgrijalva/jwt-go"
)
// ErrTokenInvalid token不合法错误
var ErrTokenInvalid = errors.New("Jwt token invalid")
// Token token对象
type Token struct {
key string
}
// Claims payload内容
type Claims map[string]interface{}
// New 创建一个Token
func New(key string) *Token {
return &Token{
key: key,
}
}
// CreateToken 创建Token
func (jt *Token) CreateToken(payloads Claims, expire time.Duration) string {
// 设置标准payload,指定有效时间范围
// 签署时间允许误差60秒
if expire != 0 {
payloads["exp"] = time.Now().Add(expire * time.Second).Unix()
}
payloads["iat"] = time.Now().Add(-60 * time.Second).Unix()
token := jwtlib.NewWithClaims(jwtlib.SigningMethodHS256, jwtlib.MapClaims(payloads))
str, err := token.SignedString([]byte(jt.key))
if err != nil {
return ""
}
return str
}
// ParseToken 解析Token
func (jt *Token) ParseToken(tokenString string) (Claims, error) {
token, err := jwtlib.Parse(tokenString, func(token *jwtlib.Token) (interface{}, error) {
if _, ok := token.Method.(*jwtlib.SigningMethodHMAC); !ok {
return nil, fmt.Errorf("Unexpected signing method: %v", token.Header["alg"])
}
return []byte(jt.key), nil
})
if err != nil {
return nil, err
}
if claims, ok := token.Claims.(jwtlib.MapClaims); ok && token.Valid {
return Claims(claims), nil
}
return nil, ErrTokenInvalid
}