use local storage events to communicate between peers
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adbenitez
parent
fc5a8a7e67
commit
a0cd14a0c0
141
webxdc.js
141
webxdc.js
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@ -1,109 +1,66 @@
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// debug friend: document.writeln(JSON.stringify(value));
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window.xdcStorage = (() => {
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var updatesKey = "__xdcUpdatesKey__";
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var fakeStorage = {
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_data: {},
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setItem: function (id, val) {
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return this._data[id] = String(val);
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},
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getItem: function (id) {
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return this._data.hasOwnProperty(id) ? this._data[id] : undefined;
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},
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removeItem: function (id) {
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return delete this._data[id];
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},
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clear: function () {
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return this._data = {};
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}
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};
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var localStorageSupported = () => {
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var testKey = "__xdcTestKey__";
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try {
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var storage = window.localStorage;
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storage.setItem(testKey, "1");
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storage.removeItem(testKey);
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return true;
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} catch (error) {
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return false;
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}
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};
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var storage = localStorageSupported() ? window.localStorage : fakeStorage;
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return {
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getUpdates: () => {
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var updatesJSON = storage.getItem(updatesKey);
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return updatesJSON ? JSON.parse(updatesJSON) : [];
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},
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saveUpdate: (update) => {
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var updates = window.xdcStorage.getUpdates();
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updates.push(update);
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storage.setItem(updatesKey, JSON.stringify(updates));
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},
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clear: () => {
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storage.clear();
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}
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};
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})();
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window.webxdc = (() => {
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var updateListener = () => {};
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var updatesKey = "__xdcUpdatesKey__";
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window.addEventListener('storage', (event) => {
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if (event.key == null) {
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window.location.reload();
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} else if (event.key == updatesKey) {
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var updates = JSON.parse(event.newValue);
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updateListener(updates[updates.length-1]);
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}
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});
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return {
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selfAddr: () => window.xdcSelfAddr || "device0@local.host",
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selfName: () => window.xdcSelfName || "device0",
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setUpdateListener: (cb) => (window.xdcUpdateListener = cb),
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getAllUpdates: () => {return getXdcRoot().xdcStorage.getUpdates();},
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selfAddr: () => {
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var params = new URLSearchParams(window.location.hash.substr(1));
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return params.get("addr") || "device0@local.host";
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},
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selfName: () => {
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var params = new URLSearchParams(window.location.hash.substr(1));
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return params.get("name") || "device0";
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},
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setUpdateListener: (cb) => (updateListener = cb),
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getAllUpdates: () => {
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var updatesJSON = window.localStorage.getItem(updatesKey);
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return updatesJSON ? JSON.parse(updatesJSON) : [];
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},
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sendUpdate: (description, payload) => {
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// alert(description+"\n\n"+JSON.stringify(payload));
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var update = {payload: payload};
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getXdcRoot().xdcStorage.saveUpdate(update);
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var all = getAllXdcWindows();
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all.forEach((w) => {
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//alert(w.xdcUpdateListener);
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w.xdcUpdateListener(update);
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});
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updateListener(update);
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var updatesJSON = window.localStorage.getItem(updatesKey);
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var updates = updatesJSON ? JSON.parse(updatesJSON) : [];
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updates.push(update);
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window.localStorage.setItem(updatesKey, JSON.stringify(updates));
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},
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};
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})();
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window.allXdcWindows = [window];
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window.xdcUpdateListener = 12;
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window.addXdcPeer = () => {
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var loc = window.location;
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// get next peer ID
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var params = new URLSearchParams(loc.hash.substr(1));
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var peerId = Number(params.get("next_peer")) || 1;
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var styleControlPanel = 'position: fixed; bottom:1em; left:1em; background-color: #000; opacity:0.8; padding:.5em; font-family: sans-serif; width: 50%;color:#fff;';
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var styleMenuLink = 'color:#fff; text-decoration: none;';
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// open a new window
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var peerName = "device" + peerId;
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var url = loc.protocol + "//" + loc.host + loc.pathname + "#name=" + peerName + "&addr=" + peerName + "@local.host";
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window.open(url);
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function getXdcRoot() {
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var test = window;
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while (typeof test.xdcRoot != 'undefined') {
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test = test.xdcRoot;
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}
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return test;
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// update next peer ID
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params.set("next_peer", peerId + 1);
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window.location.hash = "#" + params.toString();
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}
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function getAllXdcWindows() {
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var xdcRoot = getXdcRoot();
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return xdcRoot.allXdcWindows;
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window.clearXdcStorage = () => {
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window.localStorage.clear();
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window.location.reload();
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}
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function addXdcPeer() {
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var xdcChild = window.open(window.location);
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var xdcRoot = getXdcRoot();
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xdcChild.xdcRoot = xdcRoot;
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xdcChild.xdcSelfName = "device" + getAllXdcWindows().length;
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xdcChild.xdcSelfAddr = xdcChild.xdcSelfName + "@local.host";
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xdcRoot.allXdcWindows.push(xdcChild);
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}
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function clearXdcStorage() {
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getXdcRoot().xdcStorage.clear();
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alert("Done.");
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}
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function alterXdcApp() {
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window.alterXdcApp = () => {
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var styleControlPanel = 'position: fixed; bottom:1em; left:1em; background-color: #000; opacity:0.8; padding:.5em; font-family: sans-serif; width: 50%;color:#fff;';
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var styleMenuLink = 'color:#fff; text-decoration: none;';
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var title = document.getElementsByTagName('title')[0];
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if (typeof title == 'undefined') {
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title = document.createElement('title');
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@ -111,15 +68,15 @@ function alterXdcApp() {
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}
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title.innerText = window.webxdc.selfAddr();
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if (getXdcRoot() === window) {
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if (window.webxdc.selfName() == "device0") {
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var div = document.createElement('div');
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div.innerHTML =
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'<div style="' + styleControlPanel + '">' +
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'<a href="javascript:addXdcPeer();" style="' + styleMenuLink + '">Add Peer</a> | ' +
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'<a href="javascript:clearXdcStorage();" style="' + styleMenuLink + '">Clear Storage</a>' +
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'<a href="javascript:window.addXdcPeer();" style="' + styleMenuLink + '">Add Peer</a> | ' +
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'<a href="javascript:window.clearXdcStorage();" style="' + styleMenuLink + '">Clear Storage</a>' +
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'<div>';
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document.getElementsByTagName('body')[0].append(div.firstChild);
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}
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}
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window.addEventListener("load", alterXdcApp);
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window.addEventListener("load", window.alterXdcApp);
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