package utils
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import (
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"aps_crm/conf"
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"aps_crm/constvar"
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"aps_crm/model/request"
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"errors"
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"time"
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jwt "github.com/golang-jwt/jwt/v4"
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)
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type JWT struct {
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SigningKey []byte
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}
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var (
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TokenExpired = errors.New("Token is expired")
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TokenNotValidYet = errors.New("Token not active yet")
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TokenMalformed = errors.New("That's not even a token")
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TokenInvalid = errors.New("Couldn't handle this token:")
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)
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func NewJWT() *JWT {
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return &JWT{
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[]byte(conf.Conf.JWT.SigningKey),
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}
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}
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func (j *JWT) CreateClaims(baseClaims request.BaseClaims) request.CustomClaims {
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bf, _ := ParseDuration(conf.Conf.JWT.BufferTime)
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ep, _ := ParseDuration(conf.Conf.JWT.ExpiresTime)
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claims := request.CustomClaims{
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BaseClaims: baseClaims,
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BufferTime: int64(bf / time.Second), // 缓冲时间1天 缓冲时间内会获得新的token刷新令牌 此时一个用户会存在两个有效令牌 但是前端只留一个 另一个会丢失
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StandardClaims: jwt.StandardClaims{
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NotBefore: time.Now().Unix() - 1000, // 签名生效时间
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ExpiresAt: time.Now().Add(ep).Unix(), // 过期时间 7天 配置文件
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Issuer: conf.Conf.JWT.Issuer, // 签名的发行者
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},
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}
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return claims
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}
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// CreateToken 创建一个token
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func (j *JWT) CreateToken(claims request.CustomClaims) (string, error) {
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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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// CreateTokenByOldToken 旧token 换新token 使用归并回源避免并发问题
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func (j *JWT) CreateTokenByOldToken(oldToken string, claims request.CustomClaims) (string, error) {
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v, err, _ := constvar.SingleGroup.Do("JWT:"+oldToken, func() (interface{}, error) {
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return j.CreateToken(claims)
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})
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return v.(string), err
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}
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// ParseToken 解析token
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func (j *JWT) ParseToken(tokenString string) (*request.CustomClaims, error) {
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token, err := jwt.ParseWithClaims(tokenString, &request.CustomClaims{}, func(token *jwt.Token) (i interface{}, e error) {
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return j.SigningKey, nil
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})
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if err != nil {
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if ve, ok := err.(*jwt.ValidationError); ok {
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if ve.Errors&jwt.ValidationErrorMalformed != 0 {
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return nil, TokenMalformed
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} else if ve.Errors&jwt.ValidationErrorExpired != 0 {
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// Token is expired
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return nil, TokenExpired
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} else if ve.Errors&jwt.ValidationErrorNotValidYet != 0 {
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return nil, TokenNotValidYet
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} else {
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return nil, TokenInvalid
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}
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}
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}
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if token != nil {
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if claims, ok := token.Claims.(*request.CustomClaims); ok && token.Valid {
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return claims, nil
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}
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return nil, TokenInvalid
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} else {
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return nil, TokenInvalid
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}
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}
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