Downloading all the Books in a Humble Bundle (Shallow Thoughts)

Akkana's Musings on Open Source Computing and Technology, Science, and Nature.

Tue, 22 May 2018

Downloading all the Books in a Humble Bundle

Humble Bundle has a great bundle going right now (for another 15 minutes -- sorry, I meant to post this earlier) on books by Nebula-winning science fiction authors, including some old favorites of mine, and a few I'd been meaning to read.

I like Humble Bundle a lot, but one thing about them I don't like: they make it very difficult to download books, insisting that you click on every single link (and then do whatever "Download this link / yes, really download, to this directory" dance your browser insists on) rather than offering a sane option like a tarball or zip file. I guess part of their business model includes wanting their customers to get RSI. This has apparently been a problem for quite some time; a web search found lots of discussions of ways of automating the downloads, most of which apparently no longer work (none of the ones I tried did).

But a wizard friend on IRC quickly came up with a solution: some javascript you can paste into Firefox's console. She started with a quickie function that fetched all but a few of the files, but then modified it for better error checking and the ability to get different formats.

In Firefox, open the web console (Tools/Web Developer/Web Console) and paste this in the single-line javascript text field at the bottom.

// How many seconds to delay between downloads.
var delay = 1000;
// whether to use window.location or window.open
// window.open is more convenient, but may be popup-blocked
var window_open = false;
// the filetypes to look for, in order of preference.
// Make sure your browser won't try to preview these filetypes.
var filetypes = ['epub', 'mobi', 'pdf'];

var downloads = document.getElementsByClassName('download-buttons');
var i = 0;
var success = 0;

function download() {
  var children = downloads[i].children;
  var hrefs = {};
  for (var j = 0; j < children.length; j++) {
    var href = children[j].getElementsByClassName('a')[0].href;
    for (var k = 0; k < filetypes.length; k++) {
      if (href.includes(filetypes[k])) {
        hrefs[filetypes[k]] = href;
        console.log('Found ' + filetypes[k] + ': ' + href);
      }
    }
  }
  var href = undefined;
  for (var k = 0; k < filetypes.length; k++) {
    if (hrefs[filetypes[k]] != undefined) {
      href = hrefs[filetypes[k]];
      break;
    }
  }
  if (href != undefined) {
    console.log('Downloading: ' + href);
    if (window_open) {
      window.open(href);
    } else {
      window.location = href;
    }
    success++;
  }
  i++;
  console.log(i + '/' + downloads.length + '; ' + success + ' successes.');
  if (i < downloads.length) {
    window.setTimeout(download, delay);
  }
}
download();

If you have "Always ask where to save files" checked in Preferences/General, you'll still get a download dialog for each book (but at least you don't have to click; you can hit return for each one). Even if this is your preference, you might want to consider changing it before downloading a bunch of Humble books.

Anyway, pretty cool! Takes the sting out of bundles, especially big ones like this 42-book collection.

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[ 17:49 May 22, 2018    More tech/web | permalink to this entry | comments ]
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