Attacler/Bart•2y ago

How can i return a base64 as file on Deno Deploy?

Could someone give me an example for this?

7 Replies

ioB•2y ago

can you explain what you’re trying to do?

ioB•2y ago

I think this might be a https://xyproblem.info

The XY Problem

Asking about your attempted solution rather than your actual problem

Attacler/Bart•2y ago

I already found it, i basicly have to transform the base64 string into a file and then just provide it in the new Response 🙂

ioB•2y ago

Could you share code for your solution? This may be useful to people in the future looking for how to do this as well...

Attacler/Bart•2y ago

Sure:

function dataURLtoFile(dataurl, filename) {
    var arr = dataurl.split(','),
        mime = arr[0].match(/:(.*?);/)[1],
        bstr = atob(arr[1]), 
        n = bstr.length, 
        u8arr = new Uint8Array(n);
        
    while(n--){
        u8arr[n] = bstr.charCodeAt(n);
    }
    
    return new File([u8arr], filename, {type:mime});
}

function dataURLtoFile(dataurl, filename) {
    var arr = dataurl.split(','),
        mime = arr[0].match(/:(.*?);/)[1],
        bstr = atob(arr[1]), 
        n = bstr.length, 
        u8arr = new Uint8Array(n);
        
    while(n--){
        u8arr[n] = bstr.charCodeAt(n);
    }
    
    return new File([u8arr], filename, {type:mime});
}

The first argument would be your base64 string, then it gets converted to the image using the second parameter as filename. Then inside of your deploy function you can use:

return new Response(dataURLtoFile(base64Image,"file.name"));

return new Response(dataURLtoFile(base64Image,"file.name"));

This will return the file to the visitor of your deno deploy project

ioB•2y ago

cool! thanks for sharing!

Attacler/Bart•2y ago

no problem! the function dataURLtoFile comes somewhere from stackoverflow