golfnet-editor/lib/util/FileUtil.js

## Features

export function fileToDataURL(file) {
  return new Promise((resolve, reject) => {
    try {
      var reader = new FileReader();
      reader.onloadend = function() {
        resolve(reader.result);
      };
      reader.readAsDataURL(file);
    } catch (e) {
      reject(e);
    }
  });
}


export async function imageProcessor(ev, file) {
  const base64file = await fileToDataURL(file);

  // createImage(ev, base64file);
  return base64file; // passing any errors through
}

export async function fileReader(ev, files) {
  let uploadResult = [];
  let errors;
  let fileItems = files;
  if (ev && (ev.dataTransfer.items || ev.dataTransfer.files)) {
    fileItems = ev.dataTransfer.items || ev.dataTransfer.files;
  }
  try {
    if (fileItems) {
      for (var i = 0; i < fileItems.length; i++) {
        if (ev && ev.dataTransfer.items) {
          if (fileItems[i].kind === 'file') {
            var file = fileItems[i].getAsFile();
            uploadResult.push(await imageProcessor(ev, file));
          }
        } else {
          uploadResult.push(await imageProcessor(ev, fileItems[i]));
        }
      }
    }
  } catch (e) {
    errors = e;
    uploadResult = null;
  }
  return { uploadResult, errors };
}