// ==UserScript==
// @name         Gmail remove gstatic
// @namespace    ockcyp/gmail-remove-gstatic
// @version      0.1
// @description  Remove gstatic from external image URLs (useful when URLs contain internal domains)
// @author       ockcyp
// @grant        none
// ==/UserScript==
setTimeout(function() {
    // Page is loaded and the div is not already created
    if (document.title.match(/@/) === null || document.getElementById('remove_img_proxy_div')) {
        return;
    }

    var textNode = document.createTextNode("Don't use Image Proxy");
    // The div containing the links
    var divElem = document.createElement('div');
    divElem.setAttribute('style', 'position:absolute;bottom:15px;'
                         + 'font-size:12px;background-color:#EFF;padding:10px;margin:auto');
    divElem.setAttribute('id', 'remove_img_proxy_div');
    // Link to disable proxy
    var anchorElem = document.createElement('a');
    anchorElem.setAttribute('href', '#');
    anchorElem.addEventListener('click', function () {
        var img, elem, src;
        // img src
        while (img = document.evaluate('//img[contains(@src, \'googleusercontent.com\') and contains(@src, \'#http\')]', document,null,XPathResult.FIRST_ORDERED_NODE_TYPE,null).singleNodeValue) {
            src = img.attributes.src.value;
            src = src.substr(src.indexOf('#') + 1);
            img.attributes.src.value = src;
        }
        // CSS background url etc
        while (elem = document.evaluate('//*[contains(@style,\'googleusercontent.com\') and contains(@src, \'#http\')]', document, null, XPathResult.FIRST_ORDERED_NODE_TYPE, null).singleNodeValue) {
            style = elem.attributes.style.value;
            style = style.replace(/url\(([^\)#]*)#([^\)]*)\)/, "url($2)");
            elem.attributes.style.value = style;
        }
        return false;
    });
    anchorElem.setAttribute('style', 'text-decoration:none;color:black;margin-right:5px');
    anchorElem.appendChild(textNode);
    divElem.appendChild(anchorElem);
    
    // Link to hide the button
    var hideAnchor = document.createElement('a');
    hideAnchor.setAttribute('href', '#');
    hideAnchor.setAttribute('style', 'text-decoration:none;color:black;font-size:14px');
    hideAnchor.setAttribute('onclick', "document.getElementsByTagName('body')[0].removeChild(document.getElementById('remove_img_proxy_div'))");
    hideAnchor.innerHTML = '×';
    divElem.appendChild(hideAnchor);
    document.getElementsByTagName('body')[0].appendChild(divElem);
}, 5000);