Image Proxier

Replaces images from certain websites with a proxied version.
换行
// ==UserScript==
// @name         Image Proxier
// @namespace    https://github.com/GrumpyCrouton/Userscripts
// @version      1.0
// @description  Replaces images from certain websites with a proxied version.
// @author       GrumpyCrouton
// @match        *://*/*
// @grant        none
// ==/UserScript==
(function() {
    'use strict';

    var replace_from = [
        'stack.imgur.com',
        'i.stack.imgur.com',
        'graph.facebook.com',
    ];

    var proxy_link = "//grumpycrouton.com/other/image_proxy/?url=";

    var $ = window.jQuery;

    $(function() {
        //runProxier();
    });

    function runProxier() {
        $('img').each(function() {
            var image = $(this);
            if(!image.data('image_proxier_converted')) {
                image.attr('src', getProxyLink(image.attr('src')));
                image.attr('data-image_proxier_converted', 1);
            }
        });
        $('a').each(function() {
            var link = $(this);
            if(!link.data('image_proxier_converted')) {
                link.attr('href', getProxyLink(link.attr('href')));
                link.attr('data-image_proxier_converted', 1);
            }
        });
    }

    function getProxyLink(givenLink) {
        if (givenLink) {
            if (replace_from.some(function(v) {
                    return givenLink.indexOf(v) >= 0;
                })) {
                var new_link = proxy_link + encodeURIComponent(givenLink);
                console.log(new_link);
                return new_link;
            } else {
                return givenLink;
            }
        }
    }

    (function(window) {
        var last = +new Date();
        var delay = 100; // default delay

        // Manage event queue
        var stack = [];

        function callback() {
            var now = +new Date();
            if (now - last > delay) {
                for (var i = 0; i < stack.length; i++) {
                    stack[i]();
                }
                last = now;
            }
        }

        // Public interface
        var onDomChange = function(fn, newdelay) {
            if (newdelay) delay = newdelay;
            stack.push(fn);
        };

        // Naive approach for compatibility
        function naive() {

            var last = document.getElementsByTagName('*');
            var lastlen = last.length;
            var timer = setTimeout(function check() {

                // get current state of the document
                var current = document.getElementsByTagName('*');
                var len = current.length;

                // if the length is different
                // it's fairly obvious
                if (len != lastlen) {
                    // just make sure the loop finishes early
                    last = [];
                }

                // go check every element in order
                for (var i = 0; i < len; i++) {
                    if (current[i] !== last[i]) {
                        callback();
                        last = current;
                        lastlen = len;
                        break;
                    }
                }

                // over, and over, and over again
                setTimeout(check, delay);

            }, delay);
        }

        //
        //  Check for mutation events support
        //

        var support = {};

        var el = document.documentElement;
        var remain = 3;

        // callback for the tests
        function decide() {
            if (support.DOMNodeInserted) {
                window.addEventListener("DOMContentLoaded", function() {
                    if (support.DOMSubtreeModified) { // for FF 3+, Chrome
                        el.addEventListener('DOMSubtreeModified', callback, false);
                    } else { // for FF 2, Safari, Opera 9.6+
                        el.addEventListener('DOMNodeInserted', callback, false);
                        el.addEventListener('DOMNodeRemoved', callback, false);
                    }
                }, false);
            } else if (document.onpropertychange) { // for IE 5.5+
                document.onpropertychange = callback;
            } else { // fallback
                naive();
            }
        }

        // checks a particular event
        function test(event) {
            el.addEventListener(event, function fn() {
                support[event] = true;
                el.removeEventListener(event, fn, false);
                if (--remain === 0) decide();
            }, false);
        }

        // attach test events
        if (window.addEventListener) {
            test('DOMSubtreeModified');
            test('DOMNodeInserted');
            test('DOMNodeRemoved');
        } else {
            decide();
        }

        // do the dummy test
        var dummy = document.createElement("div");
        el.appendChild(dummy);
        el.removeChild(dummy);

        // expose
        window.onDomChange = onDomChange;
    })(window);

    onDomChange(function() {
        runProxier();
    });

})();
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