cfa_ads_proxy_toggle.js

// this is a simple bookmarklet to make using NASA ADS simple at CfA
// (assuming one has a CfA PIN to log into the proxy)
//
// to make it a bookmarklet, run it through: 
// John Gruber's Bookmarklet-Builder
// http://daringfireball.net/2007/03/javascript_bookmarklet_builder
// OR
// http://subsimple.com/bookmarklets/jsbuilder.htm

var public_url = "adsabs.harvard.edu";
var proxy_url = "adsabs.harvard.edu.ezp-prod1.hul.harvard.edu";

// these shouldn't really use a string literal here, but just since 
// above only really use '.' it should work
var re_pub   = new RegExp(public_url) ;
var re_proxy = new RegExp(proxy_url);

var url = location.href;

if(url.match(re_proxy)!=null){
    url=url.replace(re_proxy,public_url);
    location.href=url;
}
else if(url.match(re_pub)){
    url=url.replace(re_pub,proxy_url);
    location.href=url;
}
else{
    alert("Current URL is not NASA ADS!\nDoes not match:\n" + location.protocol + "//" + public_url);
}