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function init() {
// receive messages from webpage
chrome.runtime.onMessageExternal.addListener(receiveMessage);
}
function receiveMessage(msg, sender, sendResponse) {
if (msg.cmd == "injection_result") {
var obj = Injections.get(msg.id);
if (obj) obj.addResponse(sender.tab.id, msg.data);
}
}
function extend(dest, source) {
for (var i in source) {
dest[i] = source[i];
}
}
function getWebSocket() {
return window.WebSocket || window.MozWebSocket;
}
function print() {
var msgs = [], i, tmp;
for (i = 0; i < arguments.length; i++) {
if (arguments[i] instanceof Error) tmp = [arguments[i], arguments[i].stack];
else tmp = arguments[i];
msgs.push(tmp);
}
try {
console.log.apply(console, msgs);
} catch(e) {}
}
function getExtensionId() {
return chrome.i18n.getMessage("@@extension_id");
}
function getVKTabs(callback) {
var vkTabs = [];
chrome.tabs.query({}, function(tabs) {
for (var i = 0; i < tabs.length; i++) {
var tab = tabs[i];
if (tab.url.match(new RegExp('https?://vk.com/.*', 'gi'))) {
vkTabs.push(tab);
}
}
callback(vkTabs);
});
}
function executeCommand(cmd) {
var injId = Injections.getNextId();
var code_inj = "var el = document.createElement('script'); el.src = chrome.extension.getURL('inject_and_return.js'); document.body.appendChild(el); var el1 = document.createElement('script'); el1.textContent = 'window.__vkpc_extid=\""+getExtensionId()+"\"; window.__vkpc_injid="+injId+"'; document.body.appendChild(el1)";
var code_exec = "var el = document.createElement('script'); el.src = chrome.extension.getURL('inject_exec.js'); document.body.appendChild(el); var el1 = document.createElement('script'); el1.textContent = 'window.__vkpc_cmd=\""+cmd+"\"'; document.body.appendChild(el1)";
getVKTabs(function(tabs) {
if (!tabs.length) return;
var injResponses, activeTabId = null;
var onDone = function() {
var ok = {nowPlaying: null, lsSource: null, recentlyPlayed: null, active: activeTabId, last: null};
var results = injResponses.results, lsSource = injResponses.lsSource;
for (var i = 0; i < results.length; i++) {
var data = results[i].data, id = results[i].tab;
ok.last = id;
if (data.havePlayer && (data.isPlaying || typeof data.trackId == 'string')) {
ok.recentlyPlayed = id;
}
if (data.isPlaying) {
ok.nowPlaying = id;
}
if (lsSource && lsSource == data.instanceId) {
ok.lsSource = id;
}
}
injResponses.unregister();
var rightId = ok.nowPlaying || ok.lsSource || ok.recentlyPlayed || ok.active || ok.last;
if (rightId) {
chrome.tabs.executeScript(rightId, {code: code_exec});
}
};
injResponses = new InjectionResponses(injId, tabs.length, onDone);
for (var i = 0; i < tabs.length; i++) {
if (tabs[i].active) activeTabId = tabs[i].id;
chrome.tabs.executeScript(tabs[i].id, {
code: code_inj
});
}
});
}
var Injections = {
id: 0,
objs: {},
getNextId: function() {
return ++this.id;
},
get: function(id) {
return this.objs[id] || false;
},
register: function(id, obj) {
this.objs[id] = obj;
},
unregister: function(id) {
if (this.objs[id] !== undefined) delete this.objs[id];
}
};
var WSClient = new function() {
var STATUS_NONE = 0, STATUS_OK = 1, STATUS_ERR = 2;
var _ws = getWebSocket(), ws;
var _status = STATUS_NONE;
var ping_timer, reconnect_timer;
if (!_ws) return;
function setTimers() {
ping_timer = setInterval(function() {
if (ws) ws.send("PING");
}, 30000);
}
function unsetTimers() {
clearInterval(ping_timer);
}
function connect() {
_status = STATUS_NONE;
print("[connect]");
ws = new _ws("ws://localhost:52178", "signaling-protocol");
ws.onopen = function() {
_status = STATUS_OK;
setTimers();
};
ws.onerror = function() {
unsetTimers();
if (_status != STATUS_ERR) {
_status = STATUS_ERR;
tryToReconnect();
}
}
ws.onclose = function() {
unsetTimers();
if (_status != STATUS_ERR) {
_status = STATUS_ERR;
tryToReconnect();
}
};
ws.onmessage = function(e) {
onCommand(e.data);
};
}
function tryToReconnect() {
print("[tryToReconnect]");
clearTimeout(reconnect_timer);
reconnect_timer = setTimeout(connect, 5000);
}
function onCommand(msg) {
executeCommand(msg);
}
connect();
};
function InjectionResponses(id, count, callback) {
this.id = id;
this.results = [];
this.lsSource = null;
this.maxCount = count;
this.callback = callback || function() {};
Injections.register(this.id, this);
}
extend(InjectionResponses.prototype, {
addResponse: function(id, response) {
this.results.push({tab: id, data: response});
if (!this.lsSource && response && response.lastInstanceId) this.lsSource = response.lastInstanceId;
if (this.results.length == this.maxCount) {
this.callback();
}
},
unregister: function() {
Injections.unregister(this.id);
}
});
init();
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