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jwt.go
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jwt.go
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package middleware
import (
"net/http"
"time"
"github.com/dgrijalva/jwt-go"
"github.com/gin-gonic/gin"
"github.com/realjf/goframe/utils"
"github.com/realjf/goframe/utils/conv"
)
const (
SUCCESS = 200
INVALID_PARAMS = 99
ERROR_AUTH_CHECK_TOKEN_TIMEOUT = 98
ERROR_AUTH_CHECK_TOKEN_FAIL = 97
ISSUER = "realjf"
)
var (
jwtSecret []byte
)
type Claims struct {
Username string `json:"username"`
Password string `json:"password"`
jwt.StandardClaims
}
func JWT(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
var code int
var data interface{}
code = SUCCESS
token := r.Header.Get("token")
if token == "" {
code = INVALID_PARAMS
} else {
_, err := ParseToken(token)
if err != nil {
switch err.(*jwt.ValidationError).Errors {
case jwt.ValidationErrorExpired:
code = ERROR_AUTH_CHECK_TOKEN_TIMEOUT
default:
code = ERROR_AUTH_CHECK_TOKEN_FAIL
}
}
}
if code != SUCCESS {
w.WriteHeader(http.StatusUnauthorized)
w.Write(conv.Bytes(gin.H{
"code": code,
"message": "",
"data": data,
}))
return
}
next.ServeHTTP(w, r)
})
}
func GenerateToken(username, password string) (string, error) {
nowTime := time.Now()
expireTime := nowTime.Add(3 * time.Hour)
claims := Claims{
utils.EncodeMD5(username),
utils.EncodeMD5(password),
jwt.StandardClaims{
ExpiresAt: expireTime.Unix(),
Issuer: ISSUER,
},
}
tokenClaims := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
token, err := tokenClaims.SignedString(jwtSecret)
return token, err
}
func ParseToken(token string) (*Claims, error) {
tokenClaims, err := jwt.ParseWithClaims(token, &Claims{}, func(token *jwt.Token) (interface{}, error) {
return jwtSecret, nil
})
if tokenClaims != nil {
if claims, ok := tokenClaims.Claims.(*Claims); ok && tokenClaims.Valid {
return claims, nil
}
}
return nil, err
}