确定base64上传的文件扩展名和mime类型

Question

我有一个用于上传的base64音频的%let list = %sysfunc(compbl(&list)); %let list_csv = %sysfunc(tranwrd(&list,%str( ),%str(,))); %let list_into = :%sysfunc(tranwrd(&list,%str( ),%str( trimmed, :))) trimmed; %put NOTE: &=list; %put NOTE: &=list_csv; %put NOTE: &=list_into; 序列化程序，我注意到Base64字符串不是以数据开头的：****。如何确定上传文件的Mime类型？ i_need_the_file_extension_mimetype（）

FileField

Answer 1

由于@Ralf指针

，我终于用python-magic对其进行了排序

import { User } from './api';
declare namespace Express {
  export interface Request {
    user: User; 
  }
}

必填：pip install python-magic