canvas to s3

gistfile1.txt

source: http://stackoverflow.com/questions/13990673/upload-canvas-data-to-s3

var canvas  = document.getElementById("imagePreviewChatFooter");
var dataUrl = canvas.toDataURL("image/jpeg");
var blobData = dataURItoBlob(dataUrl);
var fileName = file.name;
var params = {Key: fileName, ContentType: file.type, Body: blobData};
             bucket.upload(params, function (err, data) {
             console.log(data);
             console.log(err ? 'ERROR!' : 'UPLOADED.');
             });
                    
                    
function dataURItoBlob(dataURI) {
    var binary = atob(dataURI.split(',')[1]);
    var array = [];
    for(var i = 0; i < binary.length; i++) {
        array.push(binary.charCodeAt(i));
    }
    return new Blob([new Uint8Array(array)], {type: 'image/jpeg'});
}