Create a 7digital authenticated track/stream URL in javascript

gistfile1.js

// requires http://oauth.googlecode.com/svn/code/javascript/
// by Ralph Cowling ralph@gl-ob.com
// get the trackID from song/search playlist/static with &bucket=id:7digital-UK at http://developer.echonest.com/
function sevDig(trackID)
{
	var base = "http://media.geo.7digital.com/media/track/stream",
	accessor = { consumerSecret: 'your_consumer_secret' },
	params = [
		['oauth_nonce',OAuth.nonce(11)],
		['oauth_timestamp',OAuth.timestamp()],
		['oauth_signature_method','HMAC-SHA1'],
		['trackId', trackID],
		['oauth_consumer_key','your_consumer_key'],
		['country','GB'],
		['userId','any_random_string_here']
	]
	var message = { 
		method: "GET", 
		action: base, 
		parameters: params
	};
	OAuth.SignatureMethod.sign(message, accessor);
	var url = base + '?' + OAuth.SignatureMethod.normalizeParameters(params) + "&oauth_signature=" +
        OAuth.getParameter(params, "oauth_signature");

	return url;
}