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jslinted. big bug fixes
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@deanoemcke
deanoemcke committed Oct 7, 2012
1 parent 601e1ad commit 50ce2c0
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322 changes: 171 additions & 151 deletions background.js
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Original file line number Diff line number Diff line change
@@ -1,168 +1,188 @@
/*global chrome, window, Image */

(function () {

"use strict";

var temporaryStorage = [];

function killTab(tab, previewUrl, faviconUrl) {

//store the tab details temporarily
temporaryStorage["tab_" + tab.id] = {
title: tab.title,
favicon: faviconUrl,
url: tab.url,
preview: previewUrl
};

//kill the current tab
var count = 0,
testLoaded = function () {
chrome.tabs.get(tab.id, function (killTab) {
//console.log('tab.id: '+ tab.id +' :: '+killTab.status);
if (killTab.status === 'complete') {
//update page to suspended.html
chrome.tabs.update(tab.id, {url: chrome.extension.getURL("suspended.html")});

} else {
count++;
//only try for 50 * 0.1 seconds
if (count < 50) {
window.setTimeout(testLoaded, 100);
}
}
});
};

chrome.tabs.update(tab.id, {url: "chrome://kill"});
testLoaded();
}

function generateFaviconUri(url, callback) {

var img = new Image();
img.onload = function () {
var canvas,
context;
canvas = window.document.createElement("canvas");
canvas.width = img.width;
canvas.height = img.height;
context = canvas.getContext("2d");
context.globalAlpha = 0.5;
context.drawImage(img, 0, 0);
callback(canvas.toDataURL());
};
//console.log(url);
img.src = url || chrome.extension.getURL("default.ico");

function generatePage(tab, previewUrl, faviconUrl) {

var expiryDate = (new Date()).setSeconds((new Date()).getSeconds() + 10);
var html = '<title>' + tab.title + '</title>';
html += '<script type="text/javascript" >';
html += 'if (new Date() > ' + expiryDate + ') { history.back(); }';
html += 'document.onclick = function(){ history.back(); };';
html += '</script>';
html += '<link rel="icon" href="' + faviconUrl + '" />'
html += '<a href="' + tab.url + '">';
if (previewUrl !== '') {
html += '<img src="' + previewUrl + '" style="padding-top:40px;" />';
}
html += '<div class="reloadNote" style="position: fixed;' +
'color: #444;' +
'text-shadow: 0 1px 0 #FFF3C5;' +
'height: 40px;' +
'background: #FDE073;' +
'top: 0;' +
'line-height: 40px;' +
'width: 100%;' +
'text-align: center;' +
'font-family: verdana, arial, sans-serif;' +
'border-bottom: 1px solid #6B5811;' +
'box-shadow: 0 4px 5px -2px #555;">Tab suspended. Click to reload.' +
'</div>';
html += '</a>';
html = html.replace(/\s{2,}/g, '') // <-- Replace all consecutive spaces, 2+
.replace(/%/g, '%25') // <-- Escape %
.replace(/&/g, '%26') // <-- Escape &
.replace(/#/g, '%23') // <-- Escape #
.replace(/"/g, '%22') // <-- Escape "
.replace(/'/g, '%27'); // <-- Escape ' (to be 100% safe)
var dataURI = 'data:text/html,' + html;

console.log('tab.id'+ tab.id +' :: generating placeholder page');
chrome.tabs.update(tab.id, {url:dataURI});

}

function suspendTab(tab) {

var preview = localStorage["greatsuspender.preview"] === "true" ? true : false;

if (preview) {
chrome.tabs.executeScript(tab.id, {file: "html2canvas.min.js"}, function() {

function sendSuspendMessage(tab, preview) {

chrome.tabs.executeScript(tab.id, {file: "content_script.js"}, function () {

var maxHeight = window.localStorage.getItem("maxHeight") || 2,
format = window.localStorage.getItem("format") || 'image/png',
quality = window.localStorage.getItem("quality") || 0.4,
faviconUrl,
previewUrl,
previewGenerated = false,
faviconGenerated = false;

//a little hack here to send two asynchronous requests and only handle the second response to come back
chrome.tabs.sendMessage(tab.id, {preview: preview, maxHeight: maxHeight, format: format, quality: quality}, function (response) {
previewUrl = response ? response.previewUrl : '';
previewGenerated = true;
if (faviconGenerated !== false) { killTab(tab, previewUrl, faviconUrl); }
});

generateFaviconUri("chrome://favicon/" + tab.url, function (response) {
faviconUrl = response;
faviconGenerated = true;
if (previewGenerated !== false) { killTab(tab, previewUrl, faviconUrl); }
});
});
}

function suspendTab(tab) {

var preview = window.localStorage.getItem("preview") === "false" ? false : true;

if (preview) {
chrome.tabs.executeScript(tab.id, {file: "html2canvas.min.js"}, function () {
sendSuspendMessage(tab, preview);
});
} else {
sendSuspendMessage(tab, preview);
});
} else {
sendSuspendMessage(tab, preview);
}

}

}

function killTab(tab, previewUrl, faviconUrl) {

var count = 0;
chrome.tabs.update(tab.id, {url:"chrome://kill"});
var testLoaded = function() {
chrome.tabs.get(tab.id, function(killTab) {
console.log('tab.id'+ tab.id +' :: '+killTab.status);
if (killTab.status === 'complete') {
generatePage(tab, previewUrl, faviconUrl);

} else {
count++;
//only try for 50 * 0.1 seconds
if (count < 50) {
setTimeout(testLoaded, 100);

function suspendOne() {

chrome.windows.getLastFocused({populate: true}, function (window) {
var i;
for (i = 0; i < window.tabs.length; i += 1) {
if (window.tabs[i].active) {
suspendTab(window.tabs[i]);
}
}
});
}
testLoaded();
}

function generateFaviconUri(url, callback) {

var img = new Image;
img.onload = function(){
var canvas = document.createElement("canvas");
canvas.width = img.width;
canvas.height = img.height;
var context = canvas.getContext("2d");
context.globalAlpha = 0.5;
context.drawImage(img, 0, 0);
/* context.globalCompositeOperation = "darker";
context.fillStyle = "#000";
context.fillRect(0, 0, img.width, img.height);
context.fill();
*/ callback(canvas.toDataURL());
};
url ? img.src = url : callback('');

}

function sendSuspendMessage(tab, preview) {

chrome.tabs.executeScript(tab.id, {file: "content_script.js"}, function() {


var maxHeight = localStorage["greatsuspender.maxHeight"] ? localStorage["greatsuspender.maxHeight"] : 2;
var format = localStorage["greatsuspender.format"] ? localStorage["greatsuspender.format"] : 'image/png';
var quality = localStorage["greatsuspender.quality"] ? +localStorage["greatsuspender.quality"] : 0.4;

console.log('tab.id'+tab.id + " :: " +'sending message...');

var previewUrl = false;
var faviconUrl = false;

chrome.tabs.sendMessage(tab.id, {preview:preview, maxHeight:maxHeight, format:format, quality:quality}, function(response) {
previewUrl = response ? response.previewUrl : '';
if (faviconUrl !== false) {killTab(tab, previewUrl, faviconUrl);}
function suspendAll() {

chrome.windows.getLastFocused({populate: true}, function (window) {
var i;
for (i = 0; i < window.tabs.length; i += 1) {
if (window.tabs[i].url.indexOf("suspended.html") < 0 && window.tabs[i].url.indexOf("chrome://kill") < 0) {
//console.log("tab.id"+window.tabs[i].id + " :: " +window.tabs[i].url);
suspendTab(window.tabs[i]);
}
}
});
}
function unsuspendAll() {

generateFaviconUri(tab.favIconUrl, function(response) {
faviconUrl = response;
if (previewUrl !== false) {killTab(tab, previewUrl, faviconUrl);}
chrome.windows.getLastFocused({populate: true}, function (window) {
var i;
for (i = 0; i < window.tabs.length; i += 1) {
if (window.tabs[i].url.indexOf("suspended.html") >= 0) {
chrome.tabs.update(window.tabs[i].id, {url: window.tabs[i].url});

} else if (window.tabs[i].url.indexOf("chrome://kill") === 0) {
chrome.tabs.reload(window.tabs[i].id);
}
}
});
});
}
}

function suspendOne() {
//handler for popup clicks
chrome.extension.onRequest.addListener(
function (request, sender, sendResponse) {

chrome.windows.getCurrent({populate:true}, function(window) {
var i;
for (i=0; i < window.tabs.length; i += 1) {
if (window.tabs[i].active) {
suspendTab(window.tabs[i]);
}
}
});
}
function suspendAll() {

chrome.windows.getCurrent({populate:true}, function(window) {
var i;
for (i=0; i < window.tabs.length; i += 1) {
if (window.tabs[i].url.indexOf("data") != 0 && window.tabs[i].url.indexOf("chrome") != 0) {
console.log("tab.id"+window.tabs[i].id + " :: " +window.tabs[i].url);
suspendTab(window.tabs[i]);
if (request.msg === "suspendOne") {
suspendOne();

} else if (request.msg === "suspendAll") {
suspendAll();

} else if (request.msg === "unsuspendAll") {
unsuspendAll();
}
}
});
}
function unsuspendAll() {

chrome.windows.getCurrent({populate:true}, function(window) {
var i;
for (i=0; i < window.tabs.length; i += 1) {
if (window.tabs[i].url.indexOf("data") === 0) {
chrome.tabs.update(window.tabs[i].id, {url:window.tabs[i].url});

} else if (window.tabs[i].url.indexOf("chrome://kill/") === 0) {
chrome.tabs.reload(window.tabs[i].id);
);

//handler for suspended.html onload
chrome.extension.onMessage.addListener(
function (request, sender, sendResponse) {
if (request.action === "initialise") {

var tabProperties = temporaryStorage["tab_" + sender.tab.id];

//if we have a some suspend information for this tab
if (typeof tabProperties !== 'undefined') {

sendResponse({
backtrack: "false",
title: tabProperties.title,
favicon: tabProperties.favicon,
url: tabProperties.url,
preview: tabProperties.preview
});

//remove this entry (so that a refresh will cause original content to be loaded)
delete temporaryStorage["tab_" + sender.tab.id];

//otherwise force tab to reload original content
} else {
sendResponse({
backtrack: "true"
});

}
}
}
})
;}

chrome.extension.onRequest.addListener(
function(request, sender, sendResponse){
if(request.msg == "suspendOne") suspendOne();
if(request.msg == "suspendAll") suspendAll();
if(request.msg == "unsuspendAll") unsuspendAll();
}
);
);

}());
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