|
| 1 | +package auth |
| 2 | + |
| 3 | +import ( |
| 4 | + "errors" |
| 5 | + "net/http" |
| 6 | + "time" |
| 7 | + |
| 8 | + "github.com/dgrijalva/jwt-go" |
| 9 | + "github.com/gin-gonic/gin" |
| 10 | +) |
| 11 | + |
| 12 | +type CustomClaims struct { |
| 13 | + ID uint `json:"userid"` |
| 14 | + NickName string |
| 15 | + AuthorityId uint |
| 16 | + jwt.StandardClaims |
| 17 | +} |
| 18 | + |
| 19 | +func JWTAuth(signKey string) gin.HandlerFunc { |
| 20 | + return func(c *gin.Context) { |
| 21 | + // 我们这里jwt鉴权取头部信息 x-token 登录时回返回token信息 这里前端需要把token存储到cookie或者本地localSstorage中 不过需要跟后端协商过期时间 可以约定刷新令牌或者重新登录 |
| 22 | + token := c.Request.Header.Get("x-token") |
| 23 | + if token == "" { |
| 24 | + c.JSON(http.StatusUnauthorized, map[string]string{ |
| 25 | + "msg": "请登录", |
| 26 | + }) |
| 27 | + c.Abort() |
| 28 | + return |
| 29 | + } |
| 30 | + j := NewJWT(signKey) |
| 31 | + // parseToken 解析token包含的信息 |
| 32 | + claims, err := j.ParseToken(token) |
| 33 | + if err != nil { |
| 34 | + if err == TokenExpired { |
| 35 | + if err == TokenExpired { |
| 36 | + c.JSON(http.StatusUnauthorized, map[string]string{ |
| 37 | + "msg": "授权已过期", |
| 38 | + }) |
| 39 | + c.Abort() |
| 40 | + return |
| 41 | + } |
| 42 | + } |
| 43 | + |
| 44 | + c.JSON(http.StatusUnauthorized, "未登陆") |
| 45 | + c.Abort() |
| 46 | + return |
| 47 | + } |
| 48 | + c.Set("claims", claims) |
| 49 | + c.Set("userId", claims.ID) |
| 50 | + c.Next() |
| 51 | + } |
| 52 | +} |
| 53 | + |
| 54 | +type JWT struct { |
| 55 | + SigningKey []byte |
| 56 | +} |
| 57 | + |
| 58 | +var ( |
| 59 | + TokenExpired = errors.New("Token is expired") |
| 60 | + TokenNotValidYet = errors.New("Token not active yet") |
| 61 | + TokenMalformed = errors.New("That's not even a token") |
| 62 | + TokenInvalid = errors.New("Couldn't handle this token:") |
| 63 | +) |
| 64 | + |
| 65 | +func NewJWT(sign string) *JWT { |
| 66 | + //zap.S().Info(global.ServerConfig.JWTInfo.SigningKey) |
| 67 | + return &JWT{ |
| 68 | + []byte(sign), //可以设置过期时间 |
| 69 | + } |
| 70 | +} |
| 71 | + |
| 72 | +// 创建一个token |
| 73 | +func (j *JWT) CreateToken(claims CustomClaims) (string, error) { |
| 74 | + token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims) |
| 75 | + return token.SignedString(j.SigningKey) |
| 76 | +} |
| 77 | + |
| 78 | +// 解析 token |
| 79 | +func (j *JWT) ParseToken(tokenString string) (*CustomClaims, error) { |
| 80 | + token, err := jwt.ParseWithClaims(tokenString, &CustomClaims{}, func(token *jwt.Token) (i interface{}, e error) { |
| 81 | + return j.SigningKey, nil |
| 82 | + }) |
| 83 | + if err != nil { |
| 84 | + if ve, ok := err.(*jwt.ValidationError); ok { |
| 85 | + if ve.Errors&jwt.ValidationErrorMalformed != 0 { |
| 86 | + return nil, TokenMalformed |
| 87 | + } else if ve.Errors&jwt.ValidationErrorExpired != 0 { |
| 88 | + // Token is expired |
| 89 | + return nil, TokenExpired |
| 90 | + } else if ve.Errors&jwt.ValidationErrorNotValidYet != 0 { |
| 91 | + return nil, TokenNotValidYet |
| 92 | + } else { |
| 93 | + return nil, TokenInvalid |
| 94 | + } |
| 95 | + } |
| 96 | + } |
| 97 | + if token != nil { |
| 98 | + if claims, ok := token.Claims.(*CustomClaims); ok && token.Valid { |
| 99 | + return claims, nil |
| 100 | + } |
| 101 | + return nil, TokenInvalid |
| 102 | + |
| 103 | + } else { |
| 104 | + return nil, TokenInvalid |
| 105 | + |
| 106 | + } |
| 107 | + |
| 108 | +} |
| 109 | + |
| 110 | +// 更新token |
| 111 | +func (j *JWT) RefreshToken(tokenString string) (string, error) { |
| 112 | + jwt.TimeFunc = func() time.Time { |
| 113 | + return time.Unix(0, 0) |
| 114 | + } |
| 115 | + token, err := jwt.ParseWithClaims(tokenString, &CustomClaims{}, func(token *jwt.Token) (interface{}, error) { |
| 116 | + return j.SigningKey, nil |
| 117 | + }) |
| 118 | + if err != nil { |
| 119 | + return "", err |
| 120 | + } |
| 121 | + if claims, ok := token.Claims.(*CustomClaims); ok && token.Valid { |
| 122 | + jwt.TimeFunc = time.Now |
| 123 | + claims.StandardClaims.ExpiresAt = time.Now().Add(1 * time.Hour).Unix() |
| 124 | + return j.CreateToken(*claims) |
| 125 | + } |
| 126 | + return "", TokenInvalid |
| 127 | +} |
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