Website Crawler using PhantomJS

sitecrawler.js

	var targetAddress = 'http://www.autohotkey.com/board/';
	var fileCount = 0;

	phantom.onError = function(msg, trace) {
		var msgStack = ['PHANTOM ERROR: ' + msg];
		if (trace && trace.length) {
			msgStack.push('TRACE:');
			trace.forEach(function(t) {
				msgStack.push(' -> ' + (t.file || t.sourceURL) + ': ' + t.line + (t.function ? ' (in function ' + t.function +')' : ''));
			});
		}
		//console.error(msgStack.join('\n'));
		console.log(msgStack.join('\n'));
		phantom.exit(1);
	};
	
	//phantom.injectJs('includes/URLutils.js'); // https://gist.github.com/Yaffle/1088850
	phantom.injectJs('includes/URLutils.js'); 
	var URL = URLUtils;

	
	var browser = new Object(); // browser object
		browser.name = 'browser';
		browser.initPage = function () {
			var webPage = require('webpage');
			var page = webPage.create();
			page.onConsoleMessage = function(msg) {
				console.log(msg);
			};
//			page.onError = function (msg, trace) {
//				var msgStack = ['PAGE ERROR: ' + msg];
//				if (trace && trace.length) {
//					msgStack.push('TRACE:');
//					trace.forEach(function(t) {
//						msgStack.push(' -> ' + (t.file || t.sourceURL) + ': ' + t.line + (t.function ? ' (in function ' + t.function +')' : ''));
//					});
//				}
//				//console.error(msgStack.join('\n'));
//				//console.log(msgStack.join('\n'));
//				throw new Error(msgStack.join('\n'));
//				//phantom.exit(1);
//			};
			
			page.viewportSize = { width: 1024, height: 1024 };
			
//			dimensions = ""
//			size = dimensions.split('*');
//			page.paperSize = size.length === 2 ? { width: size[0], height: size[1], margin: '0px' }
//											   : { format: dimensions, orientation: 'portrait', margin: '1cm' };
			
			//console.log('1. page initialized');
			return(page);	
		};
		
		browser.page = {};
		//browser.page = browser.initPage(); // first run is wasted... what to do about it?
	
		browser.refreshPage = function() {
			delete this.page;
			//this.page = null;
			this.page = this.initPage();
		};
		
		browser.processPage = function (address, mainHostname, callback) {
			var page = this.page;
			//console.log('processPage has started');
			page.open(address, function (status) {
				if (status !== 'success') {
					console.log('Unable to load '+ address);
					phantom.exit(1);
				} else {
					//var self = this;
					window.setTimeout(function() {
						var hrefs, title, output;
						//console.log(page);
						title = page.evaluate(function() {
							//console.log(document.title);
							return document.title;
						});
						
						title = fileCount++;
						output = mainHostname + '\\' + title + ".pdf";
						//console.log('5. rendering ' + output + '\n');
						page.render(output); // save page to pdf using data from page for filename
						
						page.injectJs('includes/jquery.js');
						//console.log(page.injectJs('includes/jquery.js') ? "6. jQuery injected successfully." : "jQuery was not injected");
												
						//console.log('7. collecting links');					

						hrefs = page.evaluate(function() {
							var links = [];                
							$('a').each(function(index, value) {
								//console.log($(this).attr('href'));
								links.push(btoa($(this).attr('href')));
							});
							//console.log(links);
							return links;
						});
						//this.refreshPage();
						//console.log(hrefs);
						callback(hrefs);		
					}, 5000);
				}
			});
			//console.log('3. processPage has completed');
		};

		browser.load = function(address, mainHostname, callback, cbObject){
			this.refreshPage();
			//console.log(this.name);
			//console.log(address, mainHostname, callback, cbObject);
			this.processPage(address, mainHostname, callback.bind(cbObject));
		};

	var linkProcessor = new Object(); // controller object
		linkProcessor.name = 'linkProcessor';
		linkProcessor.mainURL = new URL(targetAddress.toLowerCase());
		linkProcessor.mainHostname = linkProcessor.mainURL.hostname;
		linkProcessor.url = linkProcessor.mainURL;
		linkProcessor.linkList = [];
		//linkProcessor.linkList = [linkProcessor.url.href]; // * add first page to the pageList, set savedStatus = false
		linkProcessor.pdfList = [];
		
		linkProcessor.newLinkHandler = {};
	var newLinkHandler = linkProcessor.newLinkHandler;
			//newLinkHandler.hrefs =  [];
			//newLinkHandler.ready = false;
			newLinkHandler.name = 'newLinkHandler';
			newLinkHandler.get = function () {
				return(this.hrefs);
			};
			newLinkHandler.isReady = function () {
				//console.log(this.name + '.isReady = ' + this.ready);
				return(this.ready);
			};
			newLinkHandler.set = function (hrefsArray) {
				this.hrefs = hrefsArray;
				for(var i = 0, tot = hrefsArray.length; i < tot; ++i) {
					this.hrefs.push(atob(hrefsArray[i]));
				}
				this.ready = true;
				//console.log(this.hrefs);
				//console.log('8. newLinkHandler has been set');
				//console.log('8. newLinkHandler has been set' + "\n" + this.hrefs);
			};
			newLinkHandler.reset = function () {
				this.hrefs = [];
				this.ready = false;
				//console.log('2. newLinkHandler reset');
			};

		linkProcessor.waitFor = function (testFx, onReady, timeOutMillis) { 	// https://github.com/ariya/phantomjs/blob/master/examples/waitfor.js
			var maxtimeOutMillis = timeOutMillis ? timeOutMillis : 30000, //< Default Max Timout is 3s
				start = new Date().getTime(),
				condition = false,
				interval = setInterval(function() {
					if ( (new Date().getTime() - start < maxtimeOutMillis) && !condition ) {
						// If not time-out yet and condition not yet fulfilled
						//console.log('triggering testFx in ' + this.name + '.waitFor');
						condition = (typeof(testFx) === "string" ? eval(testFx) : testFx()); //< defensive code
					} else {
						if(!condition) {
							// If condition still not fulfilled (timeout but condition is 'false')
							console.log("time out error");
							phantom.exit(1);
						} else {
							// Condition fulfilled (timeout and/or condition is 'true')
							//console.log("'waitFor()' finished in " + (new Date().getTime() - start) + "ms.");

							//console.log(this.name);

							typeof(onReady) === "string" ? eval(onReady) : onReady(); //< Do what it's supposed to do once the condition is fulfilled
							clearInterval(interval); //< Stop this interval
						}
					}
				}, 3000); //< repeat check every 250ms
		};
			
		linkProcessor.resume = function(browser) {
			var hrefs, link, n, count, url;
			//console.log('resuming at ' + this.name + '.resume');
			//console.log(this.url.hostname);

			if(this.url.hostname === this.mainHostname){ // if the page is in the domain, add new hrefs to pageList
				hrefs = this.newLinkHandler.hrefs;

				for (var n=0, count=hrefs.length; n < count; ++n) {				
					// find javascript link destination - unimplemented

					link = hrefs[n].toLowerCase();
					//console.log('filing new link\n\n' + link + '\n');
					//console.log("/");

					if( link.charAt(0) === "/") { // fix relative link
						//console.log('fixing new relative link\n\n' + link + '\n');
						url = new URL(link, this.mainHostname);
						link = url.href;
					}
					if (link.indexOf("http://") != 0 && link.indexOf("https://") != 0) {
						//console.log(link.indexOf("http://"));
						//console.log('inspecting\n\n' + link + '\n');
					
						//console.log('falsifying new link\n\n' + link + '\n');
						link = false; // discard for now, implement better handling later
						
					}
				
					if(link != false && this.linkList.indexOf(link) === -1 && this.pdfList.indexOf(link) === -1 && this.url.href !== link ) {
						//console.log('pushing this new link into the linkList\n\n' + link + '\n');
						this.linkList.push(link);
					}

				}
				
			}

			this.pdfList.push(this.url.href);	
		
			if(this.linkList.length > 0) {
				this.url = new URL(this.linkList.pop());
				this.start(browser);
			} else {
				console.log('finished');
				phantom.exit();
			}

		};
		
		linkProcessor.start = function(browser){
				//console.log(this.name + ".start will attempt to fetch \n\n" + this.url.href + "\n");				
				console.log(fileCount + '.pdf, ' + this.url.href);
				this.newLinkHandler.reset();
				//console.log(this.url.href, this.mainHostname);
				//browser.load(this.url.href, this.mainHostname, this.newLinkHandler.set.bind(this.newLinkHandler));
				//console.log('=====');
				//console.log(this.url.href, this.mainHostname, this.newLinkHandler.set, this.newLinkHandler);
				//console.log('=====');
				browser.load(this.url.href, this.mainHostname, this.newLinkHandler.set, this.newLinkHandler);
				
				//this.waitFor(this.newLinkHandler.isReady, this.resume);
				this.waitFor(this.newLinkHandler.isReady.bind(this.newLinkHandler), this.resume.bind(this, browser));
				//waitFor(this.newLinkHandler.isReady.bind(this), this.resume.bind(this));
				//waitFor(function(){return(this.newLinkHandler.isReady);}, function(){this.resume});
				//waitFor(function(){return(this.newLinkHandler.isReady);}, function(){this.resume});
		};

	(function initFilesystem(hostname) {
		//console.log('preparing the filesystem');
		var fs = require('fs');
		var path = hostname + '/';
		if(fs.isDirectory(path) == false) {
			if(fs.makeDirectory(path)) {
				//console.log( path + ' directory was created.');
			} else {
				console.log('error: ' + path + ' directory could not be created.');
			}
		} else {
			//console.log( path + " directory already exists.");
		};
	})(linkProcessor.mainHostname);
	
	//console.log('beginning');
	console.log('file name, url address');
	linkProcessor.start(browser);