Ggtcf

I've created a folder and a file w/ permission to access a file for any Internet user. I used to think upload itself worked properly. Unfortunately, when I use

https://drive.google.com/uc?export=view&id=file.id

command, all I see is a black square and when I trying to download via downloadLink file's property, it even couldn't be opened.

So, here's my code

private static String initiateResumable(string base64, string fileType)
 String endpoint ='https://www.googleapis.com/upload/drive/v3/files?uploadType=resumable';

 map<String, Object> md = new map<String, Object>();

 md.put('name', 'demofile'); 
 md.put('parents', '[' + folderId + ']'); 

 String metadata = JSON.serialize(md);

 Integer size = Math.min(2000000, base64.length());

//return an HttpRequest object of POST method with
// Authorization token provided (JWT is used)
 HttpRequest req = createRequest('post');

 req.setEndpoint(endpoint);

 req.setHeader('Content-Type', 'application/json; charset=UTF-8');
 req.setHeader('Content-Length', String.valueOf(metadata.length()));
 req.setHeader('X-Upload-Content-Type', fileType);
 req.setHeader('X-Upload-Content-Length', String.valueOf(size));

 req.setBody(metadata);

 HttpResponse res = (new Http()).send(req);

 return res.getHeader('Location');


private static File sendFile(String base64, String fileType, String endpoint)
 Integer size = Math.min(2000000, base64.length());
 HttpRequest req = createRequest('put');
 HttpResponse res;

 req.setEndpoint(endpoint);

 req.setHeader('Content-Type', fileType);

 while(! String.isBlank(base64))
 final string buffer = base64.left(size);
 base64 = base64.removeStart(buffer);

 req.setHeader('Content-Length', String.valueOf(buffer.length()));
 req.setBody(buffer);

 res = (new Http()).send(req);
 

 return (File)JSON.deserialize(res.getBody(), File.class);

I believe that's because of base64 format, but I may be wrong

The same error occurs with the following code:

 HttpRequest req = createRequest('get');
 req.setEndpoint('https://www.googleapis.com/upload/drive/v3/files?uploadType=media');

 req.setHeader('Content-Type', fileType);
 req.setHeader('Content-Length',String.valueOf(base64.length()));
 req.setHeader('Content-Transfer-Encoding', 'base64');

 req.setBody(base64);

 HttpResponse res = (new Http()).send(req);

 File file = (File) JSON.deserialize(res.getBody(), File.class);

 return file;

It's Salesforce's Apex so no way for any frameworks, but the syntax is quite straightforward, I believe

10q in advance