136 lines
3.8 KiB
Go
136 lines
3.8 KiB
Go
package jwt
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import (
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"errors"
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"time"
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"github.com/golang-jwt/jwt/v5"
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)
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var (
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ErrTokenExpired = errors.New("token已过期")
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ErrTokenNotValidYet = errors.New("token尚未激活")
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ErrTokenMalformed = errors.New("token格式错误")
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ErrTokenInvalid = errors.New("无效的token")
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)
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// CustomClaims 自定义Claims
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type CustomClaims struct {
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BaseClaims
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BufferTime int64 `json:"bufferTime"`
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jwt.RegisteredClaims
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}
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// BaseClaims 基础Claims
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type BaseClaims struct {
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UUID string `json:"uuid"`
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ID uint `json:"userId"`
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Username string `json:"username"`
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NickName string `json:"nickName"`
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AuthorityID uint `json:"authorityId"`
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}
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// JWT JWT工具
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type JWT struct {
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SigningKey []byte
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Issuer string
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ExpiresAt time.Duration
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BufferTime time.Duration
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}
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// NewJWT 创建JWT实例
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func NewJWT(signingKey, issuer string, expiresAt, bufferTime time.Duration) *JWT {
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return &JWT{
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SigningKey: []byte(signingKey),
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Issuer: issuer,
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ExpiresAt: expiresAt,
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BufferTime: bufferTime,
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}
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}
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// CreateToken 创建token
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func (j *JWT) CreateToken(baseClaims BaseClaims) (string, error) {
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claims := CustomClaims{
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BaseClaims: baseClaims,
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BufferTime: int64(j.BufferTime / time.Second),
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RegisteredClaims: jwt.RegisteredClaims{
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Issuer: j.Issuer,
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ExpiresAt: jwt.NewNumericDate(time.Now().Add(j.ExpiresAt)),
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NotBefore: jwt.NewNumericDate(time.Now().Add(-1000)),
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IssuedAt: jwt.NewNumericDate(time.Now()),
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},
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}
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token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
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return token.SignedString(j.SigningKey)
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}
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// CreateClaims 创建Claims
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func (j *JWT) CreateClaims(baseClaims BaseClaims) CustomClaims {
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return CustomClaims{
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BaseClaims: baseClaims,
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BufferTime: int64(j.BufferTime / time.Second),
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RegisteredClaims: jwt.RegisteredClaims{
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Issuer: j.Issuer,
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ExpiresAt: jwt.NewNumericDate(time.Now().Add(j.ExpiresAt)),
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NotBefore: jwt.NewNumericDate(time.Now().Add(-1000)),
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IssuedAt: jwt.NewNumericDate(time.Now()),
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},
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}
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}
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// ParseToken 解析token
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func (j *JWT) ParseToken(tokenString string) (*CustomClaims, error) {
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token, err := jwt.ParseWithClaims(tokenString, &CustomClaims{}, func(token *jwt.Token) (interface{}, error) {
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return j.SigningKey, nil
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})
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if err != nil {
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switch {
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case errors.Is(err, jwt.ErrTokenExpired):
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return nil, ErrTokenExpired
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case errors.Is(err, jwt.ErrTokenMalformed):
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return nil, ErrTokenMalformed
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case errors.Is(err, jwt.ErrTokenNotValidYet):
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return nil, ErrTokenNotValidYet
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default:
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return nil, ErrTokenInvalid
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}
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}
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if claims, ok := token.Claims.(*CustomClaims); ok && token.Valid {
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return claims, nil
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}
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return nil, ErrTokenInvalid
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}
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// NeedRefresh 判断是否需要刷新token
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func (j *JWT) NeedRefresh(claims *CustomClaims) bool {
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return claims.ExpiresAt.Unix()-time.Now().Unix() < claims.BufferTime
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}
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// CreateTokenByOldToken 根据旧token创建新token
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func (j *JWT) CreateTokenByOldToken(oldToken string, oldClaims CustomClaims) (string, *CustomClaims, error) {
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// 更新过期时间
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oldClaims.ExpiresAt = jwt.NewNumericDate(time.Now().Add(j.ExpiresAt))
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oldClaims.IssuedAt = jwt.NewNumericDate(time.Now())
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oldClaims.NotBefore = jwt.NewNumericDate(time.Now().Add(-1000))
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token := jwt.NewWithClaims(jwt.SigningMethodHS256, oldClaims)
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newToken, err := token.SignedString(j.SigningKey)
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if err != nil {
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return "", nil, err
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}
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return newToken, &oldClaims, nil
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}
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// NewJWTFromConfig 从配置创建JWT实例（内部使用）
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func NewJWTFromConfig(signingKey, issuer, expiresTime, bufferTime string) *JWT {
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expires, _ := time.ParseDuration(expiresTime)
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if expires == 0 {
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expires = 7 * 24 * time.Hour // 默认7天
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}
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buffer, _ := time.ParseDuration(bufferTime)
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if buffer == 0 {
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buffer = 24 * time.Hour // 默认1天
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}
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return NewJWT(signingKey, issuer, expires, buffer)
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}
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