Google Apps Script to upload a file from an URL directly to Google Drive.

url_to_drive.js

// url_to_drive.gs
// Google Apps Script
// Allows uploading a URL directly to Google Drive.
//
// Live link:
// https://script.google.com/macros/s/AKfycbzvhbHS4hnWPVBDHjQzZHA0qWq0GR-6hY7TbYsNto6hZ0MeAFZt/exec
//
// Source-code:
// https://gist.github.com/denilsonsa/8134679
// https://script.google.com/d/1Ye-OEn1bDPcmeKSe4gb0YSK83RPMc4sZJt79SRt-GRY653gm2qVUptoE/edit
//
// Other solutions written by other people:
// https://ifttt.com/channels/google_drive/actions/78
// https://sites.google.com/site/fileurltodrive/
// Note: I wrote this script without looking at the source-code of other solutions.

function getFilenameFromURL(url) {
  //                  (host-ish)/(path-ish/)(filename)
  var re = /^https?:\/\/([^\/]+)\/([^?]*\/)?([^\/?]+)/;
  var match = re.exec(url);
  if (match) {
    return unescape(match[3]);
  }
  return null;
}

function getFilenameFromContentDisposition(header) {
  // It does not support escaped double-quotes inside the filename.
  // It certainly does not conform to the specs.
  var re = /; *filename=("[^"]+"|[^ ;]+)/;
  var match = re.exec(header)
  if (match) {
    return match[1];
  }
  return null;
}

function uploadToDrive(url, folderid, filename) {
  var msg = '';
  var response;

  try {
    response = UrlFetchApp.fetch(url, {
      // muteHttpExceptions: true,
      // validateHttpsCertificates: false,
      followRedirects: true  // Default is true anyway.
    });
  } catch(e) {
    return e.toString();
  }

  if (response.getResponseCode() === 200) {
    if (!filename) {
      // TODO: try content-disposition.
      filename = getFilenameFromURL(url);
    }

    if (!filename) {
      msg += 'Aborting: Filename not detected. Please supply a filename.\n'
    } else {
      var folder = DriveApp.getRootFolder();
      if (folderid) {
        folder = DriveApp.getFolderById(folderid);
      }
      var blob = response.getBlob();
      var file = folder.createFile(blob);
      file.setName(filename);
      file.setDescription("Downloaded from " + url);

      var headers = response.getHeaders();
      var content_length = NaN;
      for (var key in headers) {
        if (key.toLowerCase() == 'Content-Length'.toLowerCase()) {
          content_length = parseInt(headers[key], 10);
          break;
        }
      }

      var blob_length = blob.getBytes().length;
      msg += 'Saved "' + filename + '" (' + blob_length + ' bytes)';
      if (!isNaN(content_length)) {
        if (blob_length < content_length) {
          msg += ' WARNING: truncated from ' + content_length + ' bytes.';
        } else if (blob_length > content_length) {
          msg += ' WARNING: size is greater than expected ' + content_length + ' bytes from Content-Length header.';
        }
      }
      msg += '\nto folder "' + folder.getName() + '".\n';
    }
  } else {
    msg += 'Response code: ' + response.getResponseCode() + '\n';
  }

  // Debug: printing response headers.
  // msg += JSON.stringify(response.getHeaders(), undefined, 2) + '\n';

  return msg;
}

function newPanel(app, msg, url, folderid, filename) {
  var form = app.createFormPanel();
 
  var title = app.createLabel('Upload URL to Google Drive (10MB limit)');
  title.setStyleAttributes({
    fontSize: '2em',
    margin: '0 1ex'
  });

  var extra_links = app.createFlowPanel();
  extra_links.add(app.createInlineLabel('Written by '));
  extra_links.add(app.createAnchor('Denilson Sá', 'http://about.me/denilsonsa'));
  extra_links.add(app.createInlineLabel(', source-code available at '));
  extra_links.add(app.createAnchor('Google Apps Script', 'https://script.google.com/d/1Ye-OEn1bDPcmeKSe4gb0YSK83RPMc4sZJt79SRt-GRY653gm2qVUptoE/edit'));
  extra_links.add(app.createInlineLabel(' and at '));
  extra_links.add(app.createAnchor('GitHub Gist', 'https://gist.github.com/denilsonsa/8134679'));
  extra_links.add(app.createInlineLabel('. '));

  var text = app.createLabel(msg);
  text.setId('text');
  text.setStyleAttribute('white-space', 'pre-wrap');

  var url_label = app.createLabel('URL:');
  var url_textbox = app.createTextBox();
  url_textbox.setName('url');
  url_textbox.setId('url');
  url_textbox.setStyleAttribute('width', '99%');
  url_textbox.setValue(url);

  var filename_label = app.createLabel('Filename: (blank to auto-detect)');
  var filename_textbox = app.createTextBox();
  filename_textbox.setName('filename');
  filename_textbox.setId('filename');
  filename_textbox.setStyleAttribute('width', '99%');
  filename_textbox.setValue(filename);

  var folderid_label = app.createLabel('Folder ID: (the alphanumeric string at the Google Drive URL for a folder; blank for root folder)');
  var folderid_textbox = app.createTextBox();
  folderid_textbox.setName('folderid');
  folderid_textbox.setId('folderid');
  folderid_textbox.setStyleAttribute('width', '99%');
  folderid_textbox.setValue(folderid);

  var button = app.createSubmitButton('Upload to Drive');

  var panel = app.createVerticalPanel();
  panel.setWidth("99%")
  panel.setSpacing(5);
  panel.add(title);
  panel.add(extra_links);
  panel.add(url_label);
  panel.add(url_textbox);
  panel.add(filename_label);
  panel.add(filename_textbox);
  panel.add(folderid_label);
  panel.add(folderid_textbox);
  panel.add(button);
  panel.add(text);
  form.add(panel);

  if (app) {
    app.add(form);
  }

  return panel;
}

function getOrPost(e, app, is_post) {
  app.setTitle('Upload URL to Google Drive');

  var msg = '';
  var url = '';
  var folderid = '';
  var filename = '';

  if (is_post) {
    url = e.parameter.url.trim();
    folderid = e.parameter.folderid.trim();
    filename = e.parameter.filename.trim();
    msg += uploadToDrive(url, folderid, filename);
  }
  // msg += Logger.getLog();
  newPanel(app, msg, url, folderid, filename);
}

function doGet(e) {
  var app = UiApp.createApplication();
  getOrPost(e, app, false);
  return app;
}

function doPost(e) {
  var app = UiApp.getActiveApplication();
  getOrPost(e, app, true);
  return app;
}

@X7md May I know how you fix that, please?

For whoever comes to this Gist in the future: I haven't used this code in over five years, and it's unlikely I'm gonna use it again. The UiApp has been deprecated (Thankfully! That thing was annoying to use.), and I have no intention of rewriting this code using HtmlService. In fact, I have no intention of using this code ever again, as I don't think I have the need for it anymore.

(A little bit of history: back then, I had terrible Internet connection, so downloading stuff directly to Google Drive was significantly faster than downloading first to my computer and then uploading. Nowadays my Internet connection is fast and reliable, and I have little to no reason to download anything directly to Google Drive. Additionally, silently truncating the file to 10MB is inconvenient.)

Feel free to use this code as a basis for your own version, and even post a comment here pointing to your fixed/updated version. Have fun writing your own version!

איפה אני מכניס את הקישור שאני רוצה להוריד