Rambox-CE/app/ux/WebView.js

/**
 * Default config for all webviews created
 */
Ext.define('Hamsket.ux.WebView',{
	 extend: 'Ext.panel.Panel'
	,xtype: 'webview'

	,requires: [
		 'Hamsket.util.Format'
		,'Hamsket.util.Notifier'
		,'Hamsket.util.UnreadCounter'
		,'Hamsket.util.IconLoader'
	]

	// private
	,zoomLevel: 0
	,currentUnreadCount: 0

	// CONFIG
	,hideMode: 'offsets'
	,initComponent(config) {
		const me = this;

		function getLocation(href) {
			const match = href.match(/^(https?):\/\/([-.\w]*)(\/[^#?]*)(\?[^#]*|)(#.*|)$/);
			return match && {
				protocol: match[1],
				host: match[2],
				hostname: match[3],
				port: match[4],
				pathname: match[5],
				search: match[6],
				hash: match[7]
			};
		}

		// Allow Custom sites with self certificates
		//if ( me.record.get('trust') ) ipc.send('allowCertificate', me.src);

		Ext.apply(me, {
			 items: me.webViewConstructor()
			,title: me.record.get('tabname') ? me.record.get('name') : ''
			,icon: me.record.get('type') === 'custom' ? (me.record.get('logo') === '' ? 'resources/icons/custom.png' : me.record.get('logo')) : 'resources/icons/'+me.record.get('logo')
			,src: me.record.get('url')
			,type: me.record.get('type')
			,align: me.record.get('align')
			,notifications: me.record.get('notifications')
			,muted: me.record.get('muted')
			,tabConfig: {
				listeners: {
					afterrender ( btn ) {
						btn.el.on('contextmenu', function(e) {
							btn.showMenu('contextmenu');
							e.stopEvent();
						});
					}
					,scope: me
				}
				,clickEvent: ''
				,style: !me.record.get('enabled') ? '-webkit-filter: grayscale(1)' : ''
				,menu:  {
					 plain: true
					,items: [
						{
							 xtype: 'toolbar'
							,items: [
								{
									 xtype: 'segmentedbutton'
									,allowToggle: false
									,flex: 1
									,items: [
										{
											 text: 'Back'
											,glyph: 'XF053@FontAwesome'
											,flex: 1
											,scope: me
											,handler: me.goBack
										}
										,{
											 text: 'Forward'
											,glyph: 'XF054@FontAwesome'
											,iconAlign: 'right'
											,flex: 1
											,scope: me
											,handler: me.goForward
										}
									]
								}
							]
						}
						,'-'
						,{
							 text: 'Zoom In'
							,glyph: 'XF00E@FontAwesome'
							,scope: me
							,handler: me.zoomIn
						}
						,{
							 text: 'Zoom Out'
							,glyph: 'XF010@FontAwesome'
							,scope: me
							,handler: me.zoomOut
						}
						,{
							 text: 'Reset Zoom'
							,glyph: 'XF002@FontAwesome'
							,scope: me
							,handler: me.resetZoom
						}
						,'-'
						,{
							 text: locale['app.webview[0]']
							,glyph: 'XF021@FontAwesome'
							,scope: me
							,handler: me.reloadService
						}
						,'-'
						,{
							 text: locale['app.webview[3]']
							,glyph: 'XF121@FontAwesome'
							,scope: me
							,handler: me.toggleDevTools
						}
					]
				}
			}
			,listeners: {
				 afterrender: me.onAfterRender
				,beforedestroy: me.onBeforeDestroy
			}
		});

		me.items.push(me.statusBarConstructor(true));

		me.callParent(config);
	}

	,onBeforeDestroy() {
		const me = this;

		me.setUnreadCount(0);
	}

	,webViewConstructor( enabled ) {
		const me = this;

		let cfg;
		enabled = enabled || me.record.get('enabled');

		if ( !enabled ) {
			cfg = {
				 xtype: 'container'
				,html: '<h3>Service Disabled</h3>'
				,style: 'text-align:center;'
				,padding: 100
			};
		} else {
			cfg = [{
				 xtype: 'component'
				,hideMode: 'offsets'
				,autoRender: true
				,autoShow: true
				,autoEl: {
					 tag: 'webview'
					,src: me.record.get('url')
					,style: 'width:100%;height:100%;visibility:visible;'
					,partition: 'persist:' + me.record.get('type') + '_' + me.id.replace('tab_', '')
					,allowtransparency: 'on'
					,autosize: 'on'
					,webpreferences: 'sandbox: true' //,nativeWindowOpen=true
					//,disablewebsecurity: 'on' // Disabled because some services (Like Google Drive) dont work with this enabled
					,userAgent: me.getUserAgent()
					,preload: './resources/js/hamsket-service-api.js'
				}
			}];

			if ( Ext.getStore('ServicesList').getById(me.record.get('type')).get('allow_popups') ) cfg[0].autoEl.allowpopups = 'on';
		}

		return cfg;
	}

	,statusBarConstructor(floating) {
		const me = this;

		return {
			 xtype: 'statusbar'
			,hidden: true
			,keep: false
			,y: floating ? '-18px' : 'auto'
			,height: 19
			,dock: 'bottom'
			,defaultText: '<i class="fa fa-check fa-fw" aria-hidden="true"></i> Ready'
			,busyIconCls : ''
			,busyText: '<i class="fa fa-circle-o-notch fa-spin fa-fw"></i> '+locale['app.webview[4]']
			,items: [
				{
					 xtype: 'tbtext'
					,itemId: 'url'
				}
				,{
					 xtype: 'button'
					,glyph: 'XF00D@FontAwesome'
					,scale: 'small'
					,ui: 'decline'
					,padding: 0
					,scope: me
					,hidden: floating
					,handler: me.closeStatusBar
					,tooltip: {
						 text: 'Close statusbar until next time'
						,mouseOffset: [0,-60]
					}
				}
			]
		};
	}

	,onAfterRender() {
		const me = this;

		if ( !me.record.get('enabled') ) return;

		const webview = me.getWebView();

		// Notifications in Webview
		me.setNotifications(localStorage.getItem('locked') || JSON.parse(localStorage.getItem('dontDisturb')) ? false : me.record.get('notifications'));

		// Show and hide spinner when is loading
		webview.addEventListener("did-start-loading", function() {
			console.info('Start loading...', me.src);
			if ( !me.down('statusbar').closed || !me.down('statusbar').keep ) me.down('statusbar').show();
			me.down('statusbar').showBusy();
		});
		webview.addEventListener("did-stop-loading", function() {
			me.down('statusbar').clearStatus({useDefaults: true});
			if ( !me.down('statusbar').keep ) me.down('statusbar').hide();
		});

		webview.addEventListener("did-finish-load", function(e) {
			Hamsket.app.setTotalServicesLoaded( Hamsket.app.getTotalServicesLoaded() + 1 );

			// Apply saved zoom level
			me.setZoomLevel(me.record.get('zoomLevel'));

			// Set special icon for some service (like Slack)
			Hamsket.util.IconLoader.loadServiceIconUrl(me, webview);
		});

		// Open links in default browser
		webview.addEventListener('new-window', function(e) {
			switch ( me.type ) {
				case 'skype':
					// hack to fix multiple browser tabs on Skype link click, re #11
					if ( e.url.match(/https:\/\/web.skype.com\/..\/undefined/) ) {
						e.preventDefault();
						return;
					} else if ( e.url.indexOf('imgpsh_fullsize') >= 0 ) {
						ipc.send('image:download', e.url, e.target.partition);
						e.preventDefault();
						return;
					}
					break;
				case 'hangouts':
					e.preventDefault();
					if ( e.url.indexOf('plus.google.com/u/0/photos/albums') >= 0 ) {
						ipc.send('image:popup', e.url, e.target.partition);
						return;
					} else if ( e.url.indexOf('/el/CONVERSATION/') >= 0 ) {
						me.add({
							 xtype: 'window'
							,title: 'Video Call'
							,width: '80%'
							,height: '80%'
							,maximizable: true
							,resizable: true
							,draggable: true
							,collapsible: true
							,items: {
								 xtype: 'component'
								,hideMode: 'offsets'
								,autoRender: true
								,autoShow: true
								,autoEl: {
									 tag: 'webview'
									,src: e.url
									,style: 'width:100%;height:100%;'
									,partition: me.getWebView().partition
									,useragent: me.getUserAgent()
								}
							}
						}).show();
						return;
					}
					break;
				case 'slack':
					if ( e.url.indexOf('slack.com/call/') >= 0 ) {
						me.add({
							 xtype: 'window'
							,title: e.options.title
							,width: e.options.width
							,height: e.options.height
							,maximizable: true
							,resizable: true
							,draggable: true
							,collapsible: true
							,items: {
								 xtype: 'component'
								,hideMode: 'offsets'
								,autoRender: true
								,autoShow: true
								,autoEl: {
									 tag: 'webview'
									,src: e.url
									,style: 'width:100%;height:100%;'
									,partition: me.getWebView().partition
									,useragent: me.getUserAgent()
								}
							}
						}).show();
						e.preventDefault();
						return;
					}
					break;
				case 'icloud':
					if ( e.url.indexOf('index.html#compose') >= 0 ) {
						me.add({
							 xtype: 'window'
							,title: 'iCloud - Compose'
							,width: 700
							,height: 500
							,maximizable: true
							,resizable: true
							,draggable: true
							,collapsible: true
							,items: {
								 xtype: 'component'
								,itemId: 'webview'
								,hideMode: 'offsets'
								,autoRender: true
								,autoShow: true
								,autoEl: {
									 tag: 'webview'
									,src: e.url
									,style: 'width:100%;height:100%;'
									,partition: me.getWebView().partition
									,useragent: me.getUserAgent()
									,preload: './resources/js/hamsket-modal-api.js'
								}
							}
							,listeners: {
								show(win) {
									const webview = win.down('#webview').el.dom;
									webview.addEventListener('ipc-message', function(event) {
										const channel = event.channel;
										switch (channel) {
											case 'close':
												win.close();
												break;
											default:
												break;
										}
									});
								}
							}
						}).show();
						e.preventDefault();
						return;
					}
					break;
				case 'flowdock':
					if ( e.disposition === 'new-window' ) {
						e.preventDefault();
						require('electron').shell.openExternal(e.url);
					}
					return;
				default:
					break;
			}

			const protocol = require('url').parse(e.url).protocol;
			if (protocol === 'http:' || protocol === 'https:' || protocol === 'mailto:') {
				e.preventDefault();
				require('electron').shell.openExternal(e.url);
			}
		});

		webview.addEventListener('will-navigate', function(e, url) {
			e.preventDefault();
		});

		function JSApplyCSS()
		{
			if ( me.record ) {
				let custom_css_complex = me.record.get('custom_css_complex');
				if (custom_css_complex === true) {
					let custom_css = Ext.getStore('ServicesList').getById(me.record.get('type')).get('custom_css');
					custom_css = custom_css + me.record.get('custom_css');
					if ( custom_css !== '' ) {
						console.groupCollapsed(me.record.get('type').toUpperCase() + ' - Injected Custom CSS via JS');
						console.info(me.type);
						console.log(custom_css);
						console.groupEnd();
						let js_before = '{let mystyle=`';
						let js_after = '`,mycss=document.createElement("style");mycss.type="text/css",mycss.styleSheet?mycss.styleSheet.cssText=mystyle:mycss.appendChild(document.createTextNode(mystyle));let myDocHead=document.head;null===myDocHead||myDocHead.hamsketStyled||(myDocHead.appendChild(mycss),myDocHead.hamsketStyled=!0);let myframes=document.getElementsByTagName("iframe");for(let myframe of myframes){let mydocument,mydochead=(myframe.contentDocument||myframe.contentWindow.document).head;if(null!==mydochead&&!mydochead.hamsketStyled){let myclonedcss=mycss.cloneNode(deep=!0);mydochead.appendChild(myclonedcss),mydochead.hamsketStyled=!0}}}';
						webview.executeJavaScript(js_before + custom_css + js_after);
					}
				}
			}
		}

		webview.addEventListener("dom-ready", function(e) {
			// Mute Webview
			if ( me.record.get('muted') || localStorage.getItem('locked') || JSON.parse(localStorage.getItem('dontDisturb')) ) me.setAudioMuted(true, true);

			let js_inject = '';
			let css_inject = '';
			// Injected code to detect new messages
			if ( me.record ) {
				let js_unread = me.record.get('js_unread');
				if (!js_unread) {
					js_unread += Ext.getStore('ServicesList').getById(me.record.get('type')).get('js_unread');
				}
				if ( js_unread !== '' ) {
					console.groupCollapsed(me.record.get('type').toUpperCase() + ' - JS Injected to Detect New Messages');
					console.info(me.type);
					console.log(js_unread);
					console.groupEnd();
					js_inject += '{' + js_unread + '}';
				}
				let custom_js = Ext.getStore('ServicesList').getById(me.record.get('type')).get('custom_js');
				custom_js += me.record.get('custom_js');
				if ( custom_js !== '' ) {
					console.groupCollapsed(me.record.get('type').toUpperCase() + ' - Injected Custom JS');
					console.info(me.type);
					console.log(custom_js);
					console.groupEnd();
					js_inject += '{' + custom_js + '}';
				}
				const custom_css_complex = me.record.get('custom_css_complex');
				if (custom_css_complex === false) {
					let custom_css = Ext.getStore('ServicesList').getById(me.record.get('type')).get('custom_css');
					custom_css += me.record.get('custom_css');
					if ( custom_css !== '' ) {
						console.groupCollapsed(me.record.get('type').toUpperCase() + ' - Injected Custom CSS');
						console.info(me.type);
						console.log(custom_css);
						console.groupEnd();
						css_inject += custom_css;
					}
				}
				// Use passive listeners by default
				let passive_event_listeners = Ext.getStore('ServicesList').getById(me.record.get('type')).get('passive_event_listeners');
				if (passive_event_listeners && me.record.get('passive_event_listeners'))
				{
					/* 3rdparty: This uses npm 'default-passive-events' 1.0.10 inline. Link to license:
					* https://github.com/zzarcon/default-passive-events/blob/master/LICENSE
					* Modified to remove unnecessary event hooks.
					* This should match behavior of Chrome >= 57.
					*/
					const passive_event_listeners_code = `const eventListenerOptionsSupported=()=>{let supported=!1;try{const opts=Object.defineProperty({},"passive",{get(){supported=!0}});window.addEventListener("test",null,opts),window.removeEventListener("test",null,opts)}catch(e){}return supported},defaultOptions={passive:!0,capture:!1},supportedPassiveTypes=["scroll","wheel","touchstart","touchmove","mousewheel"],getDefaultPassiveOption=(passive,eventName)=>void 0!==passive?passive:-1!==supportedPassiveTypes.indexOf(eventName)&&defaultOptions.passive,getWritableOptions=options=>{const passiveDescriptor=Object.getOwnPropertyDescriptor(options,"passive");return passiveDescriptor&&!0!==passiveDescriptor.writable&&void 0===passiveDescriptor.set?Object.assign({},options):options},overwriteAddEvent=superMethod=>{EventTarget.prototype.addEventListener=function(type,listener,options){const usesListenerOptions="object"==typeof options&&null!==options,useCapture=usesListenerOptions?options.capture:options;options=usesListenerOptions?getWritableOptions(options):{},options.passive=getDefaultPassiveOption(options.passive,type),options.capture=void 0===useCapture?defaultOptions.capture:useCapture,superMethod.call(this,type,listener,options)},EventTarget.prototype.addEventListener._original=superMethod},supportsPassive=eventListenerOptionsSupported();if(supportsPassive){const addEvent=EventTarget.prototype.addEventListener;overwriteAddEvent(addEvent)}`;
					js_inject += '{' + passive_event_listeners_code + '}';
				}

				// Use slowed timers by default
				let slowed_timers = Ext.getStore('ServicesList').getById(me.record.get('type')).get('slowed_timers');
				if (slowed_timers && me.record.get('slowed_timers'))
				{
					const slowed_timers_code = `window.setTimeout=window.setTimeout;const __setTimeout=window.setTimeout;window.setTimeout=function(func,time, ...func_args){let a=time;return a<100&&(a=100),__setTimeout(func,a, ...func_args)};`;
					js_inject += '{' + slowed_timers_code + '}';
				}
			}

			// Prevent Title blinking (some services have) and only allow when the title have an unread regex match: "(3) Title"
			if ( Ext.getStore('ServicesList').getById(me.record.get('type')).get('titleBlink') ) {
				const js_preventBlink = `const originalTitle=document.title;Object.defineProperty(document,"title",{configurable:!0,set(a){null===a.match(new RegExp("[(]([0-9•]+)[)][ ](.*)","g"))&&a!==originalTitle||(document.getElementsByTagName("title")[0].innerHTML=a)},get:()=>document.getElementsByTagName("title")[0].innerHTML});`;
				js_inject += js_preventBlink;
			}


			// Scroll always to top (bug)
			js_inject += 'document.body.scrollTop=0;';

			// Handles Certificate Errors
			me.getWebContents().on('certificate-error', function(event, url, error, certificate, callback) {
				if ( me.record.get('trust') ) {
					event.preventDefault();
					callback(true);
				} else {
					callback(false);
				}

				me.down('statusbar').keep = true;
				me.down('statusbar').show();
				me.down('statusbar').setStatus({
					text: '<i class="fa fa-exclamation-triangle" aria-hidden="true"></i> Certification Warning'
				});
				me.down('statusbar').down('button').show();
			});

			webview.executeJavaScript(js_inject);
			webview.insertCSS(css_inject);
		});

		webview.addEventListener('load-commit', function() {
			JSApplyCSS();
		});

		webview.addEventListener('did-frame-finish-load', function() {
			JSApplyCSS();
		});

		webview.addEventListener('ipc-message', function(event) {
			const channel = event.channel;
			switch (channel) {
				case 'hamsket.setUnreadCount':
					handleSetUnreadCount(event);
					break;
				case 'hamsket.clearUnreadCount':
					handleClearUnreadCount(event);
					break;
				case 'hamsket.updateBadge':
					handleUpdateBadge(event);
					break;
				case 'hamsket.showWindowAndActivateTab':
					showWindowAndActivateTab(event);
					break;
			}

			/**
			 * Handles 'hamsket.clearUnreadCount' messages.
			 * Clears the unread count.
			 */
			function handleClearUnreadCount() {
				me.tab.setBadgeText('');
				me.currentUnreadCount = 0;
				me.setUnreadCount(0);
			}

			/**
			 * Handles 'hamsket.setUnreadCount' messages.
			 * Sets the badge text if the event contains an integer
                         * or a '•' (indicating non-zero but unknown number of unreads) as first argument.
			 *
			 * @param event
			 */
			function handleSetUnreadCount(event) {
				if (Array.isArray(event.args) === true && event.args.length > 0) {
					const count = event.args[0];
					if (count === parseInt(count, 10) || count === '•') {
						me.setUnreadCount(count);
					}
				}
			}

			function showWindowAndActivateTab(event) {
				const currentWindow = require('electron').remote.getCurrentWindow();
				currentWindow.show();
				currentWindow.focus();
				const tabPanel = Ext.cq1('app-main');
				tabPanel.getActiveTab().blur();
				tabPanel.setActiveTab(me);
				tabPanel.getActiveTab().focus();
			}

			function handleUpdateBadge(event) {
				if (Array.isArray(event.args) === true && event.args.length > 1) {
					const direct = event.args[0];
					const indirect = event.args[1];
					const count = direct > 0 ? direct : (indirect > 0 ? '•' : 0);

					if (count === parseInt(count, 10) || count === '•') {
						me.setUnreadCount(count);
					} else {
						me.handleClearUnreadCount();
					}
				}
			}
		});

		/**
		 * Register page title update event listener only for services that don't specify a js_unread
		 */
		if (Ext.getStore('ServicesList').getById(me.record.get('type')).get('js_unread') === '' &&
			 me.record.get('js_unread') === '') {
			webview.addEventListener("page-title-updated", function(e) {
				let count = e.title.match(/\(([^)]+)\)/); // Get text between (...)
				count = count ? count[1] : '0';
				count = count === '•' ? count : Ext.isArray(count.match(/\d+/g)) ? count.match(/\d+/g).join("") : count.match(/\d+/g); // Some services have special characters. Example: (•)
				count = count === null ? '0' : count;

				me.setUnreadCount(count);
			});
		}

		webview.addEventListener('did-navigate', function( e ) {
			if ( e.isMainFrame && me.record.get('type') === 'tweetdeck' ) Ext.defer(function() { webview.loadURL(e.newURL); }, 1000); // Applied a defer because sometimes is not redirecting. TweetDeck 2FA is an example.
		});

		webview.addEventListener('update-target-url', function( url ) {
			me.down('statusbar #url').setText(url.url);
		});
	}

	,setUnreadCount(newUnreadCount) {
		const me = this;

		if ( !isNaN(newUnreadCount) && (function(x) { return (x | 0) === x; })(parseFloat(newUnreadCount)) && me.record.get('includeInGlobalUnreadCounter') === true) {
			Hamsket.util.UnreadCounter.setUnreadCountForService(me.record.get('id'), newUnreadCount);
		} else {
			Hamsket.util.UnreadCounter.clearUnreadCountForService(me.record.get('id'));
		}

		me.setTabBadgeText(Hamsket.util.Format.formatNumber(newUnreadCount));

		me.doManualNotification(parseInt(newUnreadCount));
	}

	,refreshUnreadCount() {
		this.setUnreadCount(this.currentUnreadCount);
	}

	/**
	 * Dispatch manual notification if
	 * • service doesn't have notifications, so Hamsket does them
	 * • count increased
	 * • not in dnd mode
	 * • notifications enabled
	 *
	 * @param {int} count
	 */
	,doManualNotification(count) {
		const me = this;

		if (Ext.getStore('ServicesList').getById(me.type).get('manual_notifications') &&
			me.currentUnreadCount < count &&
			me.record.get('notifications') &&
			!JSON.parse(localStorage.getItem('dontDisturb'))) {
				Hamsket.util.Notifier.dispatchNotification(me, count);
		}

		me.currentUnreadCount = count;
	}

	/**
	 * Sets the tab badge text depending on the service config param "displayTabUnreadCounter".
	 *
	 * @param {string} badgeText
	 */
	,setTabBadgeText(badgeText) {
		const me = this;
		if (me.record.get('displayTabUnreadCounter') === true) {
			me.tab.setBadgeText(badgeText);
		} else {
			me.tab.setBadgeText('');
		}
	}

	/**
	 * Clears the unread counter for this view:
	 * • clears the badge text
	 * • clears the global unread counter
	 */
	,clearUnreadCounter() {
		const me = this;
		me.tab.setBadgeText('');
		Hamsket.util.UnreadCounter.clearUnreadCountForService(me.record.get('id'));
	}

	,reloadService(btn) {
		const me = this;
		const webview = me.getWebView();

		if ( me.record.get('enabled') ) {
			me.clearUnreadCounter();
			webview.loadURL(me.src);
		}
	}

	,toggleDevTools(btn) {
		const me = this;
		const webview = me.getWebView();

		if ( me.record.get('enabled')) {
			if (webview.isDevToolsOpened()) {
				webview.closeDevTools();
			} else {
				webview.openDevTools();
			}
		}
	}

	,setURL(url) {
		const me = this;
		const webview = me.getWebView();

		me.src = url;

		if ( me.record.get('enabled') ) webview.loadURL(url);
	}

	,setAudioMuted(muted, calledFromDisturb) {
		const me = this;
		const webview = me.getWebView();

		me.muted = muted;

		if ( !muted && !calledFromDisturb && JSON.parse(localStorage.getItem('dontDisturb')) ) return;

		if ( me.record.get('enabled') ) webview.setAudioMuted(muted);
	}

	,closeStatusBar() {
		const me = this;

		me.down('statusbar').hide();
		me.down('statusbar').closed = true;
		me.down('statusbar').keep = false;
	}

	,setStatusBar(keep) {
		const me = this;

		me.removeDocked(me.down('statusbar'), true);

		if ( keep ) {
			me.addDocked(me.statusBarConstructor(false));
		} else {
			me.add(me.statusBarConstructor(true));
		}
		me.down('statusbar').keep = keep;
	}

	,setNotifications(notification, calledFromDisturb) {
		const me = this;
		const webview = me.getWebView();

		me.notifications = notification;

		if ( notification && !calledFromDisturb && JSON.parse(localStorage.getItem('dontDisturb')) ) return;

		if ( me.record.get('enabled') ) ipc.send('setServiceNotifications', webview.partition, notification);
	}

	,setEnabled(enabled) {
		const me = this;

		me.clearUnreadCounter();

		me.removeAll();
		me.add(me.webViewConstructor(enabled));
		if ( enabled ) {
			me.resumeEvent('afterrender');
			me.show();
			me.tab.setStyle('-webkit-filter', 'grayscale(0)');
			me.onAfterRender();
		} else {
			me.suspendEvent('afterrender');
			me.tab.setStyle('-webkit-filter', 'grayscale(1)');
		}
	}

	,goBack() {
		const me = this;
		const webview = me.getWebView();

		if ( me.record.get('enabled') ) webview.goBack();
	}

	,goForward() {
		const me = this;
		const webview = me.getWebView();

		if ( me.record.get('enabled') ) webview.goForward();
	}
	,setZoomLevel(level)
	{
		this.getWebContents().zoomLevel = level;
	}

	,zoomIn() {
		const me = this;

		me.zoomLevel = me.zoomLevel + 1;
		if ( me.record.get('enabled') ) {
			me.record.set('zoomLevel', me.zoomLevel);
			me.setZoomLevel(me.zoomLevel);
		}
	}

	,zoomOut() {
		const me = this;

		me.zoomLevel = me.zoomLevel - 1;
		if ( me.record.get('enabled') ) {
			me.record.set('zoomLevel', me.zoomLevel);
			me.setZoomLevel(me.zoomLevel);
		}
	}

	,resetZoom() {
		const me = this;

		me.zoomLevel = 0;
		if ( me.record.get('enabled') ) {
			me.record.set('zoomLevel', me.zoomLevel);
			me.setZoomLevel(me.zoomLevel);
		}
	}

	,getWebView() {
		if ( this.record.get('enabled') ) {
			return this.down('component').el.dom;
		} else {
			return false;
		}
	}
	,getWebContents() {
		if ( this.record.get('enabled') ) {
			const remote = require('electron').remote;
			const webview = this.getWebView();
			const id = webview.getWebContentsId();
			return remote.webContents.fromId(id);
		} else {
			return false;
		}
	}
	,getUserAgent() {
		const me = this;
		// TODO: Keep just in case we need our own User Agent builder.
		// const default_ua = `Mozilla/5.0` +
		// ` (${me.getOSPlatform()})` +
		// ` AppleWebKit/537.36 (KHTML, like Gecko)` +
		// ` Chrome/${me.getChromeVersion()} Safari/537.36`;
		const default_ua = window.navigator.userAgent
							.replace(`Electron/${me.getElectronVersion()} `,'')
							.replace(`Hamsket/${me.getAppVersion()} `, '');
		const service_ua = Ext.getStore('ServicesList').getById(me.record.get('type')).get('userAgent');
		const ua = service_ua ? service_ua : default_ua;
		return ua;
	}
	,getOSArch() {
		const me = this;
		const remote = require('electron').remote;
		const platform = remote.require('os').platform();
		let arch = remote.require('os').arch();

		switch (platform) {
			case 'win32':
				arch = me.is32bit() ? 'WOW64' : 'Win64; x64';
				break;
			case 'freebsd':
				arch = me.is32bit() ? 'i386' : 'amd64';
				break;
			case 'sunos':
				arch = me.is32bit() ? 'i86pc' : 'x86_64';
				break;
			case 'linux':
			default:
				arch = me.is32bit() ? 'i686' : 'x86_64';
				break;
		}
		return arch;
	}
	,getOSArchType() {
		let arch = require('electron').remote.require('os').arch();

		switch(arch) {
			case 'x64':
			case 'ia32':
			case 'x32':
				arch='Intel';
				break;
			case 'arm64':
			case 'arm':
				arch='ARM';
				break;
			case 'mips':
			case 'mipsel':
				arch='MIPS';
				break;
			case 'ppc64':
			case 'ppc':
				arch='PPC';
				break;
			case 's390x':
			case 's390':
				arch='S390';
				break;
			default:
				arch='Unknown';
				break;
		}
		return arch;
	}
	,getOSPlatform() {
		const me = this;
		let platform = require('electron').remote.require('os').platform();
		switch (platform) {
			case 'win32':
				platform = `Windows NT ${me.getOSRelease()}; ${me.getOSArch()}`;
				break;
			case 'linux':
				platform = `X11; Linux ${me.getOSArch()}`;
				break;
			case 'darwin':
				platform = `${me.getOSArchType()} Mac OS X ${me.getOSRelease()}`;
				break;
			case 'freebsd':
				platform = `X11; FreeBSD ${me.getOSArch()}`;
				break;
			case 'sunos':
				platform = `X11; SunOS i86pc`;
				break;
			default:
				platform = `X11; ${platform} ${me.getOSArch()}`;
		}
		return platform;
	}
	,isWindows() {
		return require('electron').remote.require('os').platform() === 'win32';
	}
	,is32bit() {
		const arch = require('electron').remote.require('os').arch();
		if (arch === 'ia32' || arch === 'x32')
			return true;
		else
			return false;
	}
	,getOSRelease() {
		const me = this;
		const remote = require('electron').remote;
		return me.isWindows() ?
		remote.require('os').release().match(/([0-9]+\.[0-9]+)/)[0]
			: remote.require('os').release();
	}
	,getChromeVersion() {
		return require('electron').remote.require('process').versions['chrome'];
	}
	,getElectronVersion() {
		return require('process').versions['electron'];
	}
	,getAppVersion() {
		return require('electron').remote.app.getVersion();
	}
	,blur() {
		this.getWebView().blur();
	}
	,focus()
	{
		this.getWebView().focus();
	}
});