package middleware
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import (
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"errors"
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"github.com/golang-jwt/jwt/v4"
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"srm/request"
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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("327a9457-899a-481e-8b30-58cc97e5b808"),
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}
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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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// 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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