封装的方法类

jwtx/jwtx.go

@@ -0,0 +1,83 @@
+package jwtx
+
+import (
+	"errors"
+	"time"
+
+	"github.com/dgrijalva/jwt-go"
+)
+
+var (
+	TokenExpired        error = errors.New("token is expired")
+	TokenNotValidYet    error = errors.New("token not active yet")
+	TokenMalformed      error = errors.New("that's not even a token")
+	TokenInvalid        error = errors.New("couldn't handle this token")
+	TokenGenerateFailed error = errors.New("generate token failed!")
+
+	// defaultSignKey string = "hcVI@Nm4cjhjPVvCpL5^1%jY"
+	defaultSignKey = "arcsine(0.728)≈46°43′8″"
+
+	RedisUserKey string = "user:%d"
+)
+
+type jwtx struct {
+	SigningKey []byte
+}
+
+type Claims struct {
+	UserId     int64 `json:"user_id"`
+
+	jwt.StandardClaims
+}
+
+func NewJWT() *jwtx {
+	return &jwtx{
+		[]byte(defaultSignKey),
+	}
+}
+
+// 仅解析Token
+func (j *jwtx) Decode(tokenString string) (*Claims, error) {
+	token, err := jwt.ParseWithClaims(tokenString, &Claims{}, func(token *jwt.Token) (interface{}, error) {
+		return j.SigningKey, nil
+	})
+	if err != nil {
+		if ve, ok := err.(*jwt.ValidationError); ok {
+			if ve.Errors&jwt.ValidationErrorMalformed == jwt.ValidationErrorMalformed {
+				return nil, TokenMalformed
+			} else if ve.Errors&jwt.ValidationErrorExpired == jwt.ValidationErrorExpired {
+				// Token is expired
+				return nil, TokenExpired
+			} else if ve.Errors&jwt.ValidationErrorNotValidYet == jwt.ValidationErrorNotValidYet {
+				return nil, TokenNotValidYet
+			} else {
+				return nil, TokenInvalid
+			}
+		}
+	}
+	claims, ok := token.Claims.(*Claims)
+	if !ok || !token.Valid {
+		return nil, TokenInvalid
+	}
+	return claims, nil
+}
+
+// 根据参数生成和设置 token
+func (j *jwtx) Encode(claims *Claims, expiresTime time.Time) (string, error) {
+
+	expSecond := expiresTime.Unix()
+	nowSecond := time.Now().Unix()
+
+	if expSecond-nowSecond < 0 {
+		return "", errors.New("时间无效")
+	}
+
+	// 设置有效时间
+	claims.StandardClaims.ExpiresAt = expiresTime.Unix()
+	token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
+	tokenString, err := token.SignedString(j.SigningKey)
+	if err != nil {
+		return "", TokenGenerateFailed
+	}
+	return tokenString, nil
+}