tommytwoeyes / python-dotjs

A Python implementation of the HTTP server for the dotjs browser plugin.

dotjs

dotjs is a Google Chrome extension that executes JavaScript files in ~/.js based on their filename.

If you navigate to http://www.google.com/, dotjs will execute ~/.js/google.com.js.

This makes it super easy to spruce up your favorite pages using JavaScript.

On subdomains such as http://gist.github.com dotjs will try to load ~/.js/gist.github.com.js as well as ~/.js/github.com.js and ~/.js/com.js.

Bonus: files in ~/.js have jQuery 1.9 loaded, regardless of whether the site you're hacking uses jQuery.

Double bonus: ~/.js/default.js is loaded on every request, meaning you can stick plugins or helper functions in it.

GreaseMonkey user scripts are great, but you need to publish them somewhere and re-publish after making modifications. With dotjs, just add or edit files in ~/.js.

Example

$ cat ~/.js/github.com.js
// swap github logo with trollface
$('a[class^=header-logo-]').html(
$('<img>')
    .attr('src', '//bit.ly/ghD24e')
    .css({'width': 'auto', 'height': '22px'})
);

How It Works

Chrome extensions can't access the local filesystem, so dotjs runs a tiny web server on port 3131 that serves files out of ~/.js.

The dotjs Chrome extension then makes ajax requests to http://localhost:3131/convore.com.js any time you hit a page on convore.com, for example, and executes the returned JavaScript.

Requires

• Python >= 2.6
• Google Chrome

Install it

git clone http://github.com/hackedd/python-dotjs
cd python-dotjs
python setup.py install

OS X:

• Open https://localhost:3131 in Google Chrome
• Click the "X" Padlock icon in the address bar
• Click "Certificate Information"
• Drag the large cert icon to your desktop
• Open it with Keychain
• Configure its Trust section as shown: http://cl.ly/Pdny

Windows:

• Export the certificate as a ".cer" file:

  dotjs --print-cert > %TEMP%\dotjs.cer

• Right-click the exported ".cer" file, click "Install Certificate"
• Complete the Wizard to import the certificate to the Windows Certificate store. Make sure to select Trusted Root Certification Authorities as the destination store when asked.

Ubuntu:

• Use certutil to import the certificate to your NSS database:

  dotjs --print-cert | certutil -d sql:$HOME/.pki/nssdb -A \
      -t "P,," -n localhost-dotjs

You might need to restart Chrome before it sees the certificate as trusted. You can verify if the certificate is correctly installed by opening https://localhost:3131 in Chrome.

Finally install the Google Chrome extension: http://bit.ly/dotjs

Credits

• Original version: https://github.com/defunkt/dotjs
• Icon: http://raphaeljs.com/icons/
• jQuery: http://jquery.com/

• Ryan Tomayko for:

  "I almost wish you could just stick JavaScript in ~/.js. Do you know what I'm saying?"

Other Browsers

• Firefox Add-on
• Safari Extension
• Fluid UserScript