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jwt.go
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jwt.go
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/*
* MIT License
*
* Copyright (c) 2018 SmartestEE Co., Ltd..
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
/*
* Revision History:
* Initial: 2018/02/01 Jia Chenhui
*/
package core
import (
"net/http"
"time"
"github.com/TechCatsLab/apix/http/server"
jwtgo "github.com/dgrijalva/jwt-go"
"github.com/fengyfei/gu/libs/logger"
)
const (
InvalidUID = int32(-1)
tokenExpireInHour = 48
claimUID = "uid"
claimExpire = "exp"
respTokenKey = "token"
ClaimsKey = "user"
)
var (
// TokenHMACKey used to validate token.
// Note: This variable must be initialized before attach JWT middleware
// to HTTP Entrypoint.
TokenHMACKey string
// Defines a URL map to skip JWT validation on the specified route.
URLMap map[string]struct{}
)
func init() {
URLMap = make(map[string]struct{})
}
// InitHMACKey initialize TokenHMACKey.
func InitHMACKey(key string) {
TokenHMACKey = key
}
// Skipper -
func Skipper(path string) bool {
if _, ok := URLMap[path]; ok {
return true
}
return false
}
// JwtErrHandler -
func JwtErrHandler(w http.ResponseWriter, r *http.Request, err string) {
logger.Error(err)
http.Error(w, err, 401)
}
// NewToken generates a JWT token based on uid.
func NewToken(uid int32) (string, string, error) {
token := jwtgo.New(jwtgo.SigningMethodES256)
claims := token.Claims.(jwtgo.MapClaims)
claims[claimUID] = uid
claims[claimExpire] = time.Now().Add(time.Hour * tokenExpireInHour).Unix()
t, err := token.SignedString([]byte(TokenHMACKey))
return respTokenKey, t, err
}
// GetUID extract uid from context.
func GetUID(c *server.Context) int32 {
claims := c.Request().Context().Value(ClaimsKey)
mapClaims := claims.(jwtgo.MapClaims)
if rawUID, ok := mapClaims[claimUID].(float64); ok {
return int32(rawUID)
}
return InvalidUID
}