convert base64 string to a valid file without knowing the file type

@Tray2 I receive it from external API as base64 string

@uniqueginun Don't you get the needed information in that call as well?

@Tray2 you mean the file type? no only plain base64 string

@uniqueginun

So that is the only response you get and no additional data in the json?

@Tray2 no additional data regarding files

@uniqueginun Ok,

The base64 has the filetype in the beginning of the code

'data:image/jpeg;base64,/9j/4AAQSkZJRgABAQEAYABgAAD/2wCEAAEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAQEBAf/CABEIBkAFDgMBEQACEQEDEQH/xAA6AAABBAMBAQEBAAAAAAAAAAAEAAMFBgIHCAEJCgsBAQADAQEBAQEBAAAAAAAAAAACAwQFAQYHCAn/2gAMAwEAAhADEAAAALN9x+Tnriknx/oWPrHcbkjn2dHbFvuxn02fNPPu0f0Mf0TZ+l6z3PuersO0M

With some simple regex you should be able to extract the file type

'data:image/jpeg;base64,/9j/

@Tray2 yeah here's the problem, they send me only what is after data:image/jpeg;base64,

@uniqueginun that sounds very strange! Don't they have some documentation?

you mean the file type? no only plain base64 string

@uniqueginun I don’t believe that. Which API is this? Show an example of the API response.

You can’t just convert a Base64 string to a file without knowing what type of file it is. And there’s nothing stopping it being a harmful .EXE that’s going to pwn your server if you’re just blindly accepting files from third parties.