Problem with jwt.ParseWithClaims

[bonjourclaudio]

I Implemented the Jwt-Middleware (JwtVerify(...)) the same way as you did:

func JwtVerify(next http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		var tk = r.Header.Get("x-access-token") // Grab the token from the header

		tk = strings.TrimSpace(tk)

		if tk == "" {
			// Token is missing, returns with error code 403 Unauthorized
			w.WriteHeader(http.StatusForbidden)
			json.NewEncoder(w).Encode(Exception{Message: "Missing auth token"})
			return
		}
		claims := &models.Token{}

		_, err := jwt.ParseWithClaims(tk, claims, func(token *jwt.Token) (interface{}, error) {
			return []byte("secret"), nil
		})

		if err != nil {
			w.WriteHeader(http.StatusForbidden)
			json.NewEncoder(w).Encode(Exception{Message: err.Error()})
			return
		}

		ctx := context.WithValue(r.Context(), "user", claims)
		next.ServeHTTP(w, r.WithContext(ctx))
	})
}

When I run the program, the following error occurs:

auth/middleware.go:30:45: cannot use func literal (type func(*jwt.Token) (interface {}, error)) as type jwt.Keyfunc in argument to jwt.ParseWithClaims

My IDE also shows an error:

Cannot use 'func(token *jwt.Token) (interface{}, error)' (type func(token *jwt.Token) (interface{}, error)) as type Keyfunc

I have imported the JWT (and all other packages) via Dep.

Have you come across this problem before?

Thank you & best regards