path: root/main_background.js

var acornbase = require("acorn");
var acorn = require('acorn/dist/acorn_loose');
var jssha = require('jssha');
var walk = require("acorn/dist/walk");

console.log("main_background.js");

/**
*	Wrapper around crypto lib
*
*/
function hash(source){
	var shaObj = new jssha("SHA-256","TEXT")
	shaObj.update(source);
	return shaObj.getHash("HEX");
}


// the list of all available event attributes
var intrinsicEvents = [
    "onload",
    "onunload",
    "onclick",
    "ondblclick",
    "onmousedown",
    "onmouseup",
    "onmouseovr",
    "onmousemove",
    "onmouseout",
    "onfocus",
    "onblur",
    "onkeypress",
    "onkeydown",
    "onkeyup",
    "onsubmit",
    "onreset",
    "onselect",
    "onchange"
];
/*
	NONTRIVIAL THINGS:
	- Fetch
	- XMLhttpRequest
	- eval()
	- ?
	JAVASCRIPT CAN BE FOUND IN:
	- Event handlers (onclick, onload, onsubmit, etc.)
	- <script>JS</script>
	- <script src="/JS.js"></script>
	WAYS TO DETERMINE PASS/FAIL:
	- "// @license [magnet link] [identifier]" then "// @license-end" (may also use /* comments)
	- Automatic whitelist: (http://bzr.savannah.gnu.org/lh/librejs/dev/annotate/head:/data/script_libraries/script-libraries.json_
	- <table id="jslicense-labels1"><table> which may be linked to by a link tag identified by rel="jslicense" or data-jslicense="1"
	- In the first script tag, declare the license with @licstart/@licend
*/

var licenses = {
	'Apache-2.0':{
		'URL': 'http://www.apache.org/licenses/LICENSE-2.0',
		'Magnet link': 'magnet:?xt=urn:btih:8e4f440f4c65981c5bf93c76d35135ba5064d8b7&dn=apache-2.0.txt'
	},
	// No identifier was present in documentation
	'Artistic-2.0':{
		'URL': 'http://www.perlfoundation.org/artistic_license_2_0',
		'Magnet link': 'magnet:?xt=urn:btih:54fd2283f9dbdf29466d2df1a98bf8f65cafe314&dn=artistic-2.0.txt'
	},
	// No identifier was present in documentation
	'Boost':{
		'URL': 'http://www.boost.org/LICENSE_1_0.txt',
		'Magnet link': 'magnet:?xt=urn:btih:89a97c535628232f2f3888c2b7b8ffd4c078cec0&dn=Boost-1.0.txt'
	},
	// No identifier was present in documentation
	'BSD-3-Clause':{
		'URL': 'http://opensource.org/licenses/BSD-3-Clause',
		'Magnet link': 'magnet:?xt=urn:btih:c80d50af7d3db9be66a4d0a86db0286e4fd33292&dn=bsd-3-clause.txt',
	},
	'CPAL-1.0':{
		'URL': 'http://opensource.org/licenses/cpal_1.0',
		'Magnet link': 'magnet:?xt=urn:btih:84143bc45939fc8fa42921d619a95462c2031c5c&dn=cpal-1.0.txt'
	},
	'CC0-1.0':{
		'URL': 'http://creativecommons.org/publicdomain/zero/1.0/legalcode',
		'Magnet link': 'magnet:?xt=urn:btih:90dc5c0be029de84e523b9b3922520e79e0e6f08&dn=cc0.txt'
	},
	'EPL-1.0':{
		'URL': 'http://www.eclipse.org/legal/epl-v10.html',
		'Magnet link': 'magnet:?xt=urn:btih:4c6a2ad0018cd461e9b0fc44e1b340d2c1828b22&dn=epl-1.0.txt'
	},
	'Expat':{
		'URL': 'http://www.jclark.com/xml/copying.txt',
		'Magnet link': 'magnet:?xt=urn:btih:d3d9a9a6595521f9666a5e94cc830dab83b65699&dn=expat.txt'
	},
	'FreeBSD':{
		'URL': 'http://www.freebsd.org/copyright/freebsd-license.html',
		'Magnet link': 'magnet:?xt=urn:btih:87f119ba0b429ba17a44b4bffcab33165ebdacc0&dn=freebsd.txt'
	},
	'GPL-2.0':{
		'URL': 'http://www.gnu.org/licenses/gpl-2.0.html',
		'Magnet link': 'magnet:?xt=urn:btih:cf05388f2679ee054f2beb29a391d25f4e673ac3&dn=gpl-2.0.txt'
	},
	'GPL-3.0':{
		'URL': 'http://www.gnu.org/licenses/gpl-3.0.html',
		'Magnet link': 'magnet:?xt=urn:btih:1f739d935676111cfff4b4693e3816e664797050&dn=gpl-3.0.txt'
	},
	'LGPL-2.1':{
		'URL': 'http://www.gnu.org/licenses/lgpl-2.1.html',
		'Magnet link': 'magnet:?xt=urn:btih:5de60da917303dbfad4f93fb1b985ced5a89eac2&dn=lgpl-2.1.txt'
	},
	'LGPL-3.0':{
		'URL': 'http://www.gnu.org/licenses/lgpl-3.0.html',
		'Magnet link': 'magnet:?xt=urn:btih:0ef1b8170b3b615170ff270def6427c317705f85&dn=lgpl-3.0.txt'
	},
	'AGPL-3.0':{
		'URL': 'http://www.gnu.org/licenses/agpl-3.0.html',
		'Magnet link': 'magnet:?xt=urn:btih:0b31508aeb0634b347b8270c7bee4d411b5d4109&dn=agpl-3.0.txt'
	},
	'ISC':{
		'URL': 'https://www.isc.org/downloads/software-support-policy/isc-license/',
		'Magnet link': 'magnet:?xt=urn:btih:b8999bbaf509c08d127678643c515b9ab0836bae&dn=ISC.txt'
	},
	'MPL-2.0':{
		'URL': 'http://www.mozilla.org/MPL/2.0',
		'Magnet link': 'magnet:?xt=urn:btih:3877d6d54b3accd4bc32f8a48bf32ebc0901502a&dn=mpl-2.0.txt'
	},
	// "Public domain is not a license"
	// Replace with CC0?
	'Public-Domain':{
		'URL': 'https://www.gnu.org/licenses/license-list.html#PublicDomain',
		'Magnet link': 'magnet:?xt=urn:btih:e95b018ef3580986a04669f1b5879592219e2a7a&dn=public-domain.txt'
	},
	'UPL-1.0': {
		'URL': 'https://oss.oracle.com/licenses/upl/',
		'Magnet link': 'magnet:?xt=urn:btih:478974f4d41c3fa84c4befba25f283527fad107d&dn=upl-1.0.txt'
	},
	'WTFPL': {
		'URL': 'http://www.wtfpl.net/txt/copying/',
		'Magnet link': 'magnet:?xt=urn:btih:723febf9f6185544f57f0660a41489c7d6b4931b&dn=wtfpl.txt'
	},
	'Unlicense':{
		'URL': 'http://unlicense.org/UNLICENSE',
		'Magnet link': 'magnet:?xt=urn:btih:5ac446d35272cc2e4e85e4325b146d0b7ca8f50c&dn=unlicense.txt'
	},
	// No identifier was present in documentation
	'X11':{
		'URL': 'http://www.xfree86.org/3.3.6/COPYRIGHT2.html#3',
		'Magnet link': 'magnet:?xt=urn:btih:5305d91886084f776adcf57509a648432709a7c7&dn=x11.txt'	
	},
	// Picked one of the two links that were there
	'Modified-BSD':{
		'URL': 'http://www.xfree86.org/current/LICENSE4.html',
		'Magnet link': 'magnet:?xt=urn:btih:12f2ec9e8de2a3b0002a33d518d6010cc8ab2ae9&dn=xfree86.txt'
	}
}

// Objects which could be used to do nontrivial things.
// Scripts are not allowed to call any methods on these objects or access them in any way.
var reserved_objects = [
	//"document",
	//"window",
	"fetch",
	"XMLHttpRequest",
	"chrome", // only on chrome
	"browser", // only on firefox
	"eval"
];
// the list of all available event attributes
var intrinsic_events = [
    "onload",
    "onunload",
    "onclick",
    "ondblclick",
    "onmousedown",
    "onmouseup",
    "onmouseover",
    "onmousemove",
    "onmouseout",
    "onfocus",
    "onblur",
    "onkeypress",
    "onkeydown",
    "onkeyup",
    "onsubmit",
    "onreset",
    "onselect",
    "onchange"
];

// TODO: make it so that there is a list of objects that have certain banned methods (which also means it must ban bracket suffix notation on these objects)

// Default whitelist, comes from the script in hash_script
var default_whitelist = 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/**
*	
*	Sets global variable "webex" to either "chrome" or "browser" for
*	use on Chrome or a Firefox variant.
*
*	Change this to support a new browser that isn't Chrome or Firefox,
*	given that it supports webExtensions.
*
*	(Use the variable "webex" for all API calls after calling this)
*/
var webex;
function set_webex(){
	if(typeof(browser) == "object"){
		webex = browser;
	}
	if(typeof(chrome) == "object"){
		webex = chrome;
	}
}

// Generates JSON key for local storage
function get_storage_key(script_name,src_hash){
	return script_name;
}

/*
*
*	Called when something changes the persistent data of the add-on.
*
*	The only things that should need to change this data are:
*	a) The "Whitelist this page" button
*	b) The options screen
*
*	When the actual blocking is implemented, this will need to comminicate
*	with its code to update accordingly
*
*/
function options_listener(changes, area){
	// The cache must be flushed when settings are changed
	// TODO: See if this can be minimized
	function flushed(){
		console.log("cache flushed");
	}	
	//var flushingCache = webex.webRequest.handlerBehaviorChanged(flushed);
	

	console.log("Items updated in area" + area +": ");

	var changedItems = Object.keys(changes);
	var changed_items = "";
	for (var i = 0; i < changedItems.length; i++){
		var item = changedItems[i];		
		changed_items += item + ",";
	}
	console.log(changed_items);

}
/**
*	Executes the "Display this report in new tab" function
*	by opening a new tab with whatever HTML is in the popup
*	at the moment.
*/
var active_connections = {};
var unused_data = {};
function open_popup_tab(data){
	console.log(data);
	function gotPopup(popupURL){
		var creating = webex.tabs.create({"url":popupURL},function(a){
			console.log("[TABID:"+a["id"]+"] creating unused data entry from parent window's content");
			unused_data[a["id"]] = data;
		});
	}

	var gettingPopup = webex.browserAction.getPopup({},gotPopup);
}


/**
*
*	Clears local storage (the persistent data)
*
*/
function debug_delete_local(){
	webex.storage.local.clear();
	console.log("Local storage cleared");
}

/**
*
*	Prints local storage (the persistent data) as well as the temporary popup object
*
*/
function debug_print_local(){
	function storage_got(items){
		console.log("%c Local storage: ", 'color: red;');
		for(var i in items){
			console.log("%c "+i+" = "+items[i], 'color: blue;');
		}
	}
	console.log("%c Variable 'unused_data': ", 'color: red;');
	console.log(unused_data);
	webex.storage.local.get(storage_got);
}

/**
*
*
*	Sends a message to the content script that sets the popup entries for a tab.
*
*	var example_blocked_info = {
*		"accepted": [["REASON 1","SOURCE 1"],["REASON 2","SOURCE 2"]],
*		"blocked": [["REASON 1","SOURCE 1"],["REASON 2","SOURCE 2"]],
*		"url": "example.com"
*	}
*
*	NOTE: This WILL break if you provide inconsistent URLs to it.
*	Make sure it will use the right URL when refering to a certain script.
* 
*/
function update_popup(tab_id,blocked_info,update=false){
	var new_blocked_data;
	function get_sto(items){
		//************************************************************************//
		// Move scripts that are accepted/blocked but whitelisted to "whitelisted" category
		// (Ideally, they just would not be tested in the first place because that would be faster)
		var url = blocked_info["url"];	
		if(url === undefined){
			console.error("No url passed to update_popup");
			return 1;
		}

		function get_status(script_name){
			var temp = script_name.match(/\(.*?\)/g);
			if(temp == null){
				return "none"
			}
			var src_hash = temp[temp.length-1].substr(1,temp[0].length-2);

			for(var i in items){
				var res = i.match(/\(.*?\)/g);
				if(res != null){
					var test_hash = res[res.length-1].substr(1,res[0].length-2);
					if(test_hash == src_hash){
						return items[i];
					}		
				}
			}

			if(default_whitelist[src_hash] !== undefined){
				//console.log("Found script in default whitelist: "+default_whitelist[src_hash]);				
				return "whitelist";
			} else{
				//console.log("script " + script_name + " not in default whitelist.");
			}
			return "none";
		}
		function is_bl(script_name){
			if(get_status(script_name) == "blacklist"){
				return true;			
			}
			return false;
		}
		function is_wl(script_name){
			if(get_status(script_name) == "whitelist"){
				return true;			
			}
			return false;
		}
		new_blocked_data = {
			"accepted":[],
			"blocked":[],
			"blacklisted":[],
			"whitelisted":[],
			"url": url
		};
		for(var type in blocked_info){
			for(var script_arr in blocked_info[type]){
				if(is_bl(blocked_info[type][script_arr][0])){
					new_blocked_data["blacklisted"].push(blocked_info[type][script_arr]);
					//console.log("Script " + blocked_info[type][script_arr][0] + " is blacklisted");
					continue;
				}
				if(is_wl(blocked_info[type][script_arr][0])){
					new_blocked_data["whitelisted"].push(blocked_info[type][script_arr]);
					//console.log("Script " + blocked_info[type][script_arr][0] + " is whitelisted");
					continue;
				}
				if(type == "url"){
					continue;
				}
				// either "blocked" or "accepted"
				new_blocked_data[type].push(blocked_info[type][script_arr]);
				//console.log("Script " + blocked_info[type][script_arr][0] + " isn't whitelisted or blacklisted");			
			}
		}		
		console.log(new_blocked_data);
		//***********************************************************************************************//
		// store the blocked info until it is opened and needed
		if(update == false && active_connections[tab_id] === undefined){
			console.log("[TABID:"+tab_id+"]"+"Storing blocked_info for when the browser action is opened or asks for it.");
			unused_data[tab_id] = new_blocked_data; 
		} else{
			unused_data[tab_id] = new_blocked_data; 
			console.log("[TABID:"+tab_id+"]"+"Sending blocked_info directly to browser action");
			active_connections[tab_id].postMessage({"show_info":new_blocked_data});
			delete active_connections[tab_id];
		}
	}
	webex.storage.local.get(get_sto);
}

/**
*
*	This is what you call when a page gets changed to update the info box.
*
*	Sends a message to the content script that adds a popup entry for a tab.
*
*	var example_blocked_info = {
*		"accepted"or "blocked": ["name","reason"],
*		"url": "example.com"
*	}
*
*	Returns true/false based on if script should be accepted/denied respectively
*
*	NOTE: This WILL break if you provide inconsistent URLs to it.
*	Make sure it will use the right URL when refering to a certain script.
*
*/
function add_popup_entry(tab_id,src_hash,blocked_info,update=false){
	return new Promise((resolve, reject) => {
		var new_blocked_data;

		// Make sure the entry in unused_data exists 

		var url = blocked_info["url"];		
		if(url === undefined){
			console.error("No url passed to update_popup");
			return 1;
		}

		if(unused_data[tab_id] === undefined){
			unused_data[tab_id] = {
				"accepted":[],
				"blocked":[],
				"blacklisted":[],
				"whitelisted":[],
				"url": url
			};
		}
		if(unused_data[tab_id]["accepted"] === undefined){unused_data[tab_id]["accepted"] = [];}
		if(unused_data[tab_id]["blocked"] === undefined){unused_data[tab_id]["blocked"] = [];}
		if(unused_data[tab_id]["blacklisted"] === undefined){unused_data[tab_id]["blacklisted"] = [];}
		if(unused_data[tab_id]["whitelisted"] === undefined){unused_data[tab_id]["whitelisted"] = [];}
	
		var type = "";

		if(blocked_info["accepted"] !== undefined){
			type = "accepted";
		}
		if(blocked_info["blocked"] !== undefined){
			type = "blocked";
		}

		function get_sto(items){
			function get_status(script_name,src_hash){
				var temp = script_name.match(/\(.*?\)/g);
				if(temp == null){
					return "none"
				}
				var src_hash = temp[temp.length-1].substr(1,temp[0].length-2);

				for(var i in items){
					var res = i.match(/\(.*?\)/g);
					if(res != null){
						var test_hash = res[res.length-1].substr(1,res[0].length-2);
						if(test_hash == src_hash){
							return items[i];
						}		
					}
				}

				if(default_whitelist[src_hash] !== undefined){
					//console.log("Found script in default whitelist: "+default_whitelist[src_hash]);				
					return "whitelist";
				} else{
					//console.log("script " + script_name + " not in default whitelist.");
				}

				return "none";
			}
			function is_bl(script_name){
				if(get_status(script_name) == "blacklist"){
					return true;			
				}
				return false;
			}
			function is_wl(script_name){
				if(get_status(script_name) == "whitelist"){
					return true;			
				}
				return false;
			}
			

			// Search unused data for the given entry
			function not_duplicate(entry,key){
				var flag = true;
				for(var i = 0; i < unused_data[tab_id][entry].length; i++){
					if(unused_data[tab_id][entry][i][0] == key[0]){
						flag = false;
					}					
				}
				return flag;			
			}
			var type_key = "";
			var res = "";
			if(is_bl(blocked_info[type][0])){
				type_key = "blacklisted";
				res = "bl";
				//console.log("Script " + blocked_info[type][0] + " is blacklisted");
			}
			else if(is_wl(blocked_info[type][0])){
				type_key = "whitelisted";
				res = "wl";
				//console.log("Script " + blocked_info[type][0] + " is whitelisted");
			} else{
				type_key = type;
				res = "none";
				//console.log("Script " + blocked_info[type][0] + " isn't whitelisted or blacklisted");
			}
			if(not_duplicate(type_key,blocked_info[type])){
				unused_data[tab_id][type_key].push(blocked_info[type]);
				resolve(res);
			} else{
				resolve(res);
			}
		}
		webex.storage.local.get(get_sto);
	});
}


function get_domain(url){
	var domain = url.replace('http://','').replace('https://','').split(/[/?#]/)[0];
	if(url.indexOf("http://") == 0){
		domain = "http://" + domain;
	}
	else if(url.indexOf("https://") == 0){
		domain = "https://" + domain;
	}
	domain = domain + "/";
	domain = domain.replace(/ /g,"");
	return domain;
}


/**
*
*	This is the callback where the content scripts of the browser action will contact the background script.
*
*/
var portFromCS;
function connected(p) {
	if(p["name"] == "contact_finder"){
		// Send a message back with the relevant settings
		function cb(items){
			p.postMessage(items);
		}
		webex.storage.local.get(cb);
		return;		
	}
	p.onMessage.addListener(function(m) {
		/**
		*	Updates the entry of the current URL in storage
		*/
		function set_script(script,val){
			if(val != "whitelist" && val != "forget" && val != "blacklist"){
				console.error("Key must be either 'whitelist', 'blacklist' or 'forget'");
			}
			// (Remember that we do not trust the names of scripts.)
			var current_url = "";
			function geturl(tabs) {
				current_url = tabs[0]["url"];
				var domain = get_domain(current_url);

				// The space char is a valid delimiter because encodeURI() replaces it with %20 
				var scriptkey = m[val][0];
				if(val == "forget"){
					var prom = webex.storage.local.remove(scriptkey);
					// TODO: This should produce a "Refresh the page for this change to take effect" message
				} else{
					var newitem = {};
					newitem[scriptkey] = val;
					webex.storage.local.set(newitem);			
				}
			}
			var querying = webex.tabs.query({active: true,currentWindow: true},geturl);			
			return;
		}
		var update = false;
		var contact_finder = false;
		if(m["whitelist"] !== undefined){
			set_script(m["whitelist"][0],"whitelist");
			update = true;
		}
		if(m["blacklist"] !== undefined){
			set_script(m["blacklist"][0],"blacklist");
			update = true;		
		}
		if(m["forget"] !== undefined){
			set_script(m["forget"][0],"forget");
			update = true;		
		}
		// 
		if(m["open_popup_tab"] !== undefined){
			open_popup_tab(m["open_popup_tab"]);
		}
		// a debug feature
		if(m["printlocalstorage"] !== undefined){
			debug_print_local();
		}
		// invoke_contact_finder
		if(m["invoke_contact_finder"] !== undefined){
			contact_finder = true;
			inject_contact_finder();
		}
		// a debug feature (maybe give the user an option to do this?)
		if(m["deletelocalstorage"] !== undefined){
			debug_delete_local();
		}
		// Add this domain to the whitelist
		if(m["allow_all"] !== undefined){
			var domain = get_domain(m["allow_all"]["url"]);
			add_csv_whitelist(domain);
		}
		// Remote this domain from the whitelist
		if(m["block_all"] !== undefined){
			var domain = get_domain(m["block_all"]["url"]);
			remove_csv_whitelist(domain);
		}
		function logTabs(tabs) {
			if(contact_finder){
				console.log("[TABID:"+tab_id+"] Injecting contact finder");
				//inject_contact_finder(tabs[0]["id"]);
			}
			if(update){
				console.log("%c updating tab "+tabs[0]["id"],"color: red;");
				update_popup(tabs[0]["id"],unused_data[tabs[0]["id"]],true);
				active_connections[tabs[0]["id"]] = p;
			}
			for(var i = 0; i < tabs.length; i++) {
				var tab = tabs[i];
				var tab_id = tab["id"];
				if(unused_data[tab_id] !== undefined){
					// If we have some data stored here for this tabID, send it
					console.log("[TABID:"+tab_id+"]"+"Sending stored data associated with browser action");								
					p.postMessage({"show_info":unused_data[tab_id]});
				} else{
					// create a new entry
					unused_data[tab_id] = {"url":tab["url"],"blocked":"","accepted":""};
					p.postMessage({"show_info":unused_data[tab_id]});							
					console.log("[TABID:"+tab_id+"]"+"No data found, creating a new entry for this window.");	
				}
			}
		}
		var querying = webex.tabs.query({active: true,currentWindow: true},logTabs);
		
	});
}

/**
*	The callback for tab closings.
*
*	Delete the info we are storing about this tab if there is any.
*
*/
function delete_removed_tab_info(tab_id, remove_info){
	console.log("[TABID:"+tab_id+"]"+"Deleting stored info about closed tab");
	if(unused_data[tab_id] !== undefined){
		delete unused_data[tab_id];
	}
	if(active_connections[tab_id] !== undefined){
		delete active_connections[tab_id];
	}
}

/**
*	Turns a blob URL into a data URL
*
*/
function get_data_url(blob,url){
	return new Promise((resolve, reject) => {
		//var url = URL.createObjectURL(blob);
		var reader  = new FileReader();
		reader.addEventListener("load", function(){
			//console.log("redirecting");
			//console.log(url);
			//console.log("to");
			//console.log(reader.result);		
			resolve({"redirectUrl": reader.result});
		});
		reader.readAsDataURL(blob);
	});
}
/**
*	Check whitelisted by hash
*
*/
function blocked_status(hash){
	return new Promise((resolve, reject) => {
		function cb(items){
			var wl = items["pref_whitelist"];
			for(var i in items){
				var res = i.match(/\(.*?\)/g);
				if(res != null){
					var test_hash = res[res.length-1].substr(1,res[0].length-2);
					if(test_hash == hash){
						resolve(items[i]);
					}		
				}
			}
			resolve("none");
			return;
		}
		webex.storage.local.get(cb);
	});
}
/* *********************************************************************************************** */

// - For each definition of anything executable that gets a name, including methods:
//  It must call only primitives. (except altering the dom, eval, ajax, square bracket notation) 


// The number of conditionals and loops must be at most 3.

// It does not declare an array more than 50 elements long.
// (This will be under VariableDeclarator)
// At every VariableDeclarator, see if it has 


//  It must not call itself


// "The number of conditionals and loops must be at most 5" 
var loops = ["ForInStatement","ForStatement","DoWhileStatement","WhileStatement","IfStatement","SwitchStatement"];


/**
*	Rigorously determines if code is trivial or not based on the official triviality criterion 
*/
function full_evaluate(script){
	var ast = acorn.parse_dammit(script);
	
	var amtloops = 0;
	var conditionals = 0;
	var flag = true;


	console.log(ast);

	return true;
	
	walk.full(ast, node => {
		if(flag){
			if(node.type != "Literal"){
				console.log("%c"+node.type+":","color:purple;");
				console.log(script.substring(node["start"],node["end"]));
			}

			// Pretty sure this is bracket suffix notation
			if(node.type == "MemberExpression"){
				console.log("%c NONTRIVIAL: Bracket suffix notation.","color:red");
				flag = false;				
			}

			// This is the beginning of some "object chain"
			if(node.type == "ExpressionStatement"){
				
			}

			if(node.arguments !== undefined){
				console.log("%cCalls function:","color:white");
				script.substring(node.start,node.end)
			}

			// "It does not declare an array more than 50 elements long."
			// (what about dictionaries?)
			if(node.type == "ArrayExpression"){

				var len = 0;
			
				try{
					var temp = script.substring(node["start"],node["end"]);
					len = JSON.parse(temp).length;
				} catch(e){
					console.warn("Invalid array?");
					len = 99;
				}
			
				if(len > 50){
					console.log("%c NONTRIVIAL: Array longer than 50 elements. ("+len+")","color:red");
					flag = false;
				}

			}

			// "The number of conditionals and loops must be at most 3."
			for(var i = 0; i < loops.length; i++){
				if(node.type == loops[i]){
					amtloops++;
					break;
				}
			}

			if(amtloops > 3){
				console.log("%c NONTRIVIAL: Too many loops/conditionals.","color:red");
				flag = false;
			}

		}
	});

	if(flag == true){
		console.log("%cScript is trivial.","color:green");
	}	

	return flag;

}
//full_evaluate("if(true){}if(true){}if(true){}if(true){}");
//full_evaluate("var test  =[0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50];");

var test = 'object[test];';
full_evaluate(test);
full_evaluate('object.test.method["something"];');
/**
*	Performs the initial pass on code to see if it needs to be completely parsed
*/
function evaluate(script,name){
	function reserved_object_regex(object){
		var arith_operators = "\\+\\-\\*\\/\\%\\=";
		var scope_chars = "\{\}\]\[\(\)\,";
		var trailing_chars = "\s*"+"\(\.\[";
		return new RegExp("(?:[^\\w\\d]|^|(?:"+arith_operators+"))"+object+'(?:\\s*?(?:[\\;\\,\\.\\(\\[])\\s*?)',"g");
	}		
	reserved_object_regex("window");
	var all_strings = new RegExp('".*?"'+"|'.*?'","gm");
	var ml_comment = /\/\*([\s\S]+?)\*\//g;
	var il_comment = /\/\/.+/gm;
	var bracket_pairs = /\[.+?\]/g;
	var temp = script.replace(/'.+?'+/gm,"'string'");
	temp = temp.replace(/".+?"+/gm,'"string"');
	temp = temp.replace(ml_comment,"");
	temp = temp.replace(il_comment,"");
	console.log("%c ------evaluation results for "+ name +"------","color:white");
	console.log("Script accesses reserved objects?");
	var flag = true;
	var reason = ""
	// 	This is where individual "passes" are made over the code
	for(var i = 0; i < reserved_objects.length; i++){
		var res = reserved_object_regex(reserved_objects[i]).exec(temp);
		if(res != null){
			console.log("%c fail","color:red;");
			flag = false;		
			reason = "Script uses a reserved object (" + reserved_objects[i] + ")";
		}
	}
	if(flag){
		console.log("%c pass","color:green;");
	} else{
		return [flag,reason+"<br>"];
	}
	
	flag = full_evaluate(temp);


	// If flag is set true at this point, the script is trivial
	if(flag){
		reason = "Script was determined to be trivial.";
	}
	return [flag,reason+"<br>"];
}
function license_valid(matches){
	if(matches.length != 4){
		return [false, "malformed or unrecognized license tag"];
	}
	if(matches[1] != "@license"){
		return [false, "malformed or unrecognized license tag"];	
	}
	if(licenses[matches[3]] === undefined){
		return [false, "malformed or unrecognized license tag"];
	}
	if(licenses[matches[3]]["Magnet link"] != matches[2]){
		return [false, "malformed or unrecognized license tag"];
	}
	return [true,"Recognized license as '"+matches[3]+"'<br>"];
}
/**
*
*	Evaluates the content of a script (license, if it is non-trivial)
*
*	Returns
*	[ 
*		true (accepted) or false (denied),
*		edited content,
*		reason text		
*	]
*/
function license_read(script_src,name){
	
	var reason_text = "";

	var edited_src = "";
	var unedited_src = script_src;
	var nontrivial_status;
	var parts_denied = false;
	var parts_accepted = false;
	while(true){
		// TODO: support multiline comments
		var matches = /\/\s*?(@license)\s([\S]+)\s([\S]+$)/gm.exec(unedited_src);
		if(matches == null){
			nontrivial_status = evaluate(unedited_src,name);
			if(nontrivial_status[0] == true){
				parts_accepted = true;
				edited_src += unedited_src;
			} else{
				parts_denied = true;
				edited_src += "\n/*\nLIBREJS BLOCKED:"+nontrivial_status[1]+"\n*/\n";
			}
			reason_text += "\n" + nontrivial_status[1];
			
			if(parts_denied == true && parts_accepted == true){
				reason_text = "Script was determined partly non-trivial after editing. (check source for details)\n"+reason_text;
			}
			if(parts_denied == true && parts_accepted == false){
				return [false,edited_src,reason_text];
			}
			return [true,edited_src,reason_text];
			
		}
		var before = unedited_src.substr(0,matches["index"]);
		nontrivial_status = evaluate(before,name);
		if(nontrivial_status[0] == true){
			parts_accepted = true;
			edited_src += before;
		} else{
			parts_denied = true;
			edited_src += "\n/*\nLIBREJS BLOCKED:"+nontrivial_status[1]+"\n*/\n";
		}
		unedited_src = unedited_src.substr(matches["index"],unedited_src.length);
		// TODO: support multiline comments
		var matches_end = /\/\/\s*?(@license-end)/gm.exec(unedited_src);
		if(matches_end == null){
			console.log("ERROR: @license with no @license-end");
			return [false,"\n/*\n ERROR: @license with no @license-end \n*/\n","ERROR: @license with no @license-end"];
		}
		var endtag_end_index = matches_end["index"]+matches_end[0].length;
		var license_res = license_valid(matches);
		if(license_res[0] == true){
			edited_src =  edited_src + unedited_src.substr(0,endtag_end_index);
			reason_text += "\n" + license_res[1];		
		} else{
			edited_src = edited_src + "\n/*\n"+license_res[1]+"\n*/\n";
			reason_text += "\n" + license_res[1];
		}
		// trim off everything we just evaluated
		unedited_src = unedited_src.substr(endtag_end_index,unedited_src.length);
	}
}

/* *********************************************************************************************** */
// TODO: Test if this script is being loaded from another domain compared to unused_data[tabid]["url"]

/**
*
*	Returns a promise that resolves with the final edited script as a string.
*/
function get_script(response,url,tabid,wl,index=-1){
	return new Promise((resolve, reject) => {
		if(unused_data[tabid] === undefined){
			unused_data[tabid] = {"url":url,"accepted":[],"blocked":[]};
		}
		var tok_index = url.split("/").length;		
		var scriptname = url.split("/")[tok_index-1];
		if(wl == true){
			// Accept without reading script, it was explicitly whitelisted
			if(typeof(unused_data[tabid]["accepted"].push) != "function"){
				unused_data[tabid]["accepted"] = [[scriptname,"Page is whitelisted in preferences"]];
			} else{
				unused_data[tabid]["accepted"].push([scriptname,"Page is whitelisted in preferences"]);
			}				
			resolve("\n/*\n LibreJS: Script whitelisted by user (From a URL found in comma seperated whitelist)\n*/\n"+response);
			if(index != -1){
				resolve(["\n/*\n LibreJS: Script whitelisted by user (From a URL found in comma seperated whitelist)\n*/\n"+response,index]);
			} else{
				resolve("\n/*\n LibreJS: Script whitelisted by user (From a URL found in comma seperated whitelist)\n*/\n"+response);
			}
		}
	
		var src_hash = hash(response);
		var edited = license_read(response,scriptname);
		var verdict = edited[0];
		var popup_res;
		var domain = get_domain(url);

		var badge_str = 0;

		if(unused_data[tabid]["blocked"] !== undefined){
			badge_str += unused_data[tabid]["blocked"].length;
		}

		if(unused_data[tabid]["blacklisted"] !== undefined){
			badge_str += unused_data[tabid]["blacklisted"].length;
		}
		console.log("amt. blocked on page:"+badge_str);
		if(badge_str > 0 || verdict == false){
			webex.browserAction.setBadgeText({
				text: "GRR",
				tabId: tabid
			});
			webex.browserAction.setBadgeBackgroundColor({
				color: "red",
				tabId: tabid
			});			
		} else{
			webex.browserAction.setBadgeText({
				text: "OK",
				tabId: tabid
			});
			webex.browserAction.setBadgeBackgroundColor({
				color: "green",
				tabId: tabid
			});	
		}

		if(verdict == true){
			popup_res = add_popup_entry(tabid,src_hash,{"url":domain,"accepted":[scriptname+" ("+src_hash+")",edited[2]]});
		} else{
			popup_res = add_popup_entry(tabid,src_hash,{"url":domain,"blocked":[scriptname+" ("+src_hash+")",edited[2]]});
		}

		popup_res.then(function(list_verdict){
			var blob;
			if(list_verdict == "wl"){
				// redirect to the unedited version
				if(index != -1){
					resolve(["/* LibreJS: Script whitelisted by user */\n"+response,index]);
				} else{
					resolve("/* LibreJS: Script whitelisted by user */\n"+response);
				}
			}else if(list_verdict == "bl"){
				// Blank the entire script
				if(index != -1){
					resolve(["/* LibreJS: Script blacklisted by user */\n",index]);
				} else{
					resolve("/* LibreJS: Script blacklisted by user */\n");
				}
			} else{
				// Return the edited (normal) version
				if(index != -1){
					resolve(["/* LibreJS: Script acknowledged */\n"+edited[1],index]);
				} else{
					resolve("/* LibreJS: Script acknowledged */\n"+edited[1]);
				}
			}
		});
	});
}

function read_script(a){

	var filter = webex.webRequest.filterResponseData(a.requestId);
	var decoder = new TextDecoder("utf-8");
	var encoder = new TextEncoder(); // TODO: make sure this doesn't cause undeclared decoding

	filter.ondata = event => {
		var str = decoder.decode(event.data, {stream: true});
		var res = test_url_whitelisted(a.url);
		res.then(function(whitelisted){
			var edit_script;
			if(whitelisted == true){
				// Doesn't matter if this is accepted or blocked, it will still be whitelisted
				edit_script = get_script(str,a.url,a["tabId"],true);
			} else{
				edit_script = get_script(str,a.url,a["tabId"],false);
			}
			edit_script.then(function(edited){
				filter.write(encoder.encode(edited));
				filter.disconnect();
			});
		});
	}
	return {};

}

/**
*	Removes noscript tags with name "librejs-path" leaving the inner content to load.
*/
function remove_noscripts(html_doc){
	for(var i = 0; i < html_doc.getElementsByName("librejs-path").length; i++){
		if(html_doc.getElementsByName("librejs-path")[i].tagName == "NOSCRIPT"){
			debugger;
		}
	}
	
	return html_doc.documentElement.innerHTML;
}
/**
* 	Reads/changes the HTML of a page and the scripts within it.
*
*/
function edit_html(html,url,tabid,wl){
	
	return new Promise((resolve, reject) => {
		if(wl == true){
			// Don't bother, page is whitelisted
			resolve(html);	 
		}
		
		var parser = new DOMParser();
		var html_doc = parser.parseFromString(html, "text/html");

		var amt_scripts = 0;
		var total_scripts = 0;
		var scripts = html_doc.scripts;
	
		// Deal with intrinsic events

		var has_intrinsic_events = [];
		for(var i = 0; i < html_doc.all.length; i++){
			for(var j = 0; j < intrinsic_events.length; j++){
				if(intrinsic_events[j] in html_doc.all[i].attributes){
					has_intrinsic_events.push([i,j]);
				}
			}
		}

		// "i" is an index in html_doc.all
		// "j" is an index in intrinsicEvents
		function edit_event(src,i,j,name){
			var edited = get_script(src,name);
			edited.then(function(){
				html_doc.all[i].attributes[intrinsicEvents[j]].value = edited[0];
			});
		}

		// Find all the document's elements with intrinsic events
		for(var i = 0; i < has_intrinsic_events.length; i++){
			var s_name = "Intrinsic event ["+has_intrinsic_events[i][0]+"]";
			edit_event(html_doc.all[has_intrinsic_events[i][0]].attributes[intrinsicEvents[has_intrinsic_events[i][1]]].value,has_intrinsic_events[i][0],has_intrinsic_events[i][1],s_name);
		}

		// Deal with inline scripts
		
		for(var i = 0; i < scripts.length; i++){
			if(scripts[i].src == ""){
				total_scripts++;
			}
		}

		console.log("Analyzing "+total_scripts+" inline scripts...");

		for(var i = 0; i < scripts.length; i++){
			if(scripts[i].src == ""){
				var edit_script = get_script(scripts[i].innerHTML,url,tabid,wl,i);
				edit_script.then(function(edited){
					var edited_source = edited[0];
					var unedited_source = html_doc.scripts[edited[1]].innerHTML.trim();

					html_doc.scripts[edited[1]].innerHTML = edited_source;
			
					amt_scripts++;

					if(amt_scripts >= total_scripts){
						resolve(remove_noscripts(html_doc));					
					}		

				});
			}
		}

		if(total_scripts == 0){
			console.log("Nothing to analyze.");
			resolve(remove_noscripts(html_doc));
		}

	});
}
/**
* Callback for main frame requests
* 
*/
function read_document(a){
	
	if(unused_data[a["tabId"]] !== undefined && unused_data[a["tabId"]]["url"] != get_domain(a["url"])){
		delete unused_data[a["tabId"]];
		console.log("Page Changed!!!");
	}
	var str = "";
	var filter = webex.webRequest.filterResponseData(a.requestId);
	var decoder = new TextDecoder("utf-8");
	var encoder = new TextEncoder(); // TODO: make sure this doesn't cause undeclared decoding
	filter.onerror = event => {
		console.log("%c Error in getting document","color:red");
	}
	filter.onstop = event => {
		var test = new ArrayBuffer();

		var res = test_url_whitelisted(a.url);
		res.then(function(whitelisted){
			var edit_page;
			if(whitelisted == true){
				console.log("WHITELISTED");
				// Doesn't matter if this is accepted or blocked, it will still be whitelisted
				filter.write(encoder.encode(str));
				filter.disconnect();
				return;
			} else{
				edit_page = edit_html(str,a.url,a["tabId"],false);
				edit_page.then(function(edited){
					filter.write(encoder.encode(edited));
					filter.disconnect();
				});
			}
		});
	}
	filter.ondata = event => {
		str += decoder.decode(event.data, {stream: true});
		return;		
	}
	return {};

}

/**
*	Initializes various add-on functions
*	only meant to be called once when the script starts
*/
function init_addon(){

	set_webex();
	webex.runtime.onConnect.addListener(connected);
	webex.storage.onChanged.addListener(options_listener);
	webex.tabs.onRemoved.addListener(delete_removed_tab_info);

	// Analyzes remote scripts
	webex.webRequest.onBeforeRequest.addListener(
		read_script,
		{urls:["<all_urls>"], types:["script"]},
		["blocking"]
	);

	// Analyzes the scripts inside of HTML
	webex.webRequest.onBeforeRequest.addListener(
		read_document,
		{urls:["<all_urls>"], types:["main_frame"]},
		["blocking"]
	);
}

/**
*	Test if a page is whitelisted/blacklisted.
*
*	The input here is tested against the comma seperated string found in the options.
*
*	It does NOT test against the individual entries created by hitting the "whitelist"
*	button for a script in the browser action.
*/
function test_url_whitelisted(url){
	return new Promise((resolve, reject) => {
		function cb(items){
			var wl = items["pref_whitelist"];
			if(wl !== undefined && wl !== ""){
				wl = wl.split(",");
			} else{
				resolve(false);
				return;
			}
			var regex;
			for(var i in wl){
				var s = wl[i].replace(/\*/g,"\\S*");
				s = s.replace(/\./g,"\\.");
				regex = new RegExp(s, "g");
				if(url.match(regex)){
					//console.log("%c" + wl[i] + " matched " + url,"color: purple;");
					resolve(true);
					return;
				} else{
					//console.log("%c" + wl[i] + " didn't match " + url,"color: #dd0000;");
				}
			}
			resolve(false);
			return;
		}
		webex.storage.local.get(cb);
	});
}

/**
*	Loads the contact finder on the given tab ID.
*/
function inject_contact_finder(tab_id){
	function executed(result) {
	  console.log("[TABID:"+tab_id+"]"+"finished executing contact finder: " + result);
	}
	var executing = webex.tabs.executeScript(tab_id, {file: "/contact_finder.js"}, executed);
}
/**
*	Adds given domain to the whitelist in options
*/
function add_csv_whitelist(domain){
	function storage_got(items){
		if(items["pref_whitelist"] == ""){
			items["pref_whitelist"] = domain + "*";
		} else if(items["pref_whitelist"] == "undefined"){
			items["pref_whitelist"] = domain + "*";		
		} else{
			items["pref_whitelist"] += "," + domain + "*";		
		}
		console.log("New CSV whitelist:");
		console.log(items["pref_whitelist"]);
		webex.storage.local.set({"pref_whitelist":items["pref_whitelist"]});
	}
	webex.storage.local.get(storage_got);	
}

/**
*	removes given domain from the whitelist in options
*/
function remove_csv_whitelist(domain){
	function storage_got(items){
		if(items["pref_whitelist"] != ""){
			domain = domain + "\\*";
			domain.replace(/\./g,"\.");
			// remove domain
			console.log(new RegExp(domain,"g"));
			items["pref_whitelist"] = items["pref_whitelist"].replace(new RegExp(domain,"g"),"")
			// if an entry was deleted, it will leave an extra comma
			items["pref_whitelist"] = items["pref_whitelist"].replace(/,+/g,",");
			// remove trailing comma if the last one was deleted
			if(items["pref_whitelist"].charAt(items["pref_whitelist"].length-1) == ","){
				items["pref_whitelist"] = items["pref_whitelist"].substr(0,items["pref_whitelist"].length-2);
			}
		}
		console.log("New CSV whitelist:");
		console.log(items["pref_whitelist"]);
		webex.storage.local.set({"pref_whitelist":items["pref_whitelist"]});
	}
	webex.storage.local.get(storage_got);	
}

init_addon();