wappalyzer/drivers/chrome/js/content.js

(function() {
	var c = {
		init: function() {
			c.log('init');

			chrome.extension.sendRequest({ id: 'analyze', subject: { html: document.documentElement.innerHTML } });

			c.getEnvironmentVars();
		},

		log: function(message) {
			chrome.extension.sendRequest({ id: 'log', message: '[ content.js ] ' + message });
		},

		getEnvironmentVars: function() {
			c.log('getEnvironmentVars');

			if ( typeof document.documentElement.innerHTML === 'undefined' ) {
				return;
			}

			try {
				var container = document.createElement('wappalyzerData');

				container.setAttribute('id',    'wappalyzerData');
				container.setAttribute('style', 'display: none');

				var script = document.createElement('script');

				script.setAttribute('id', 'wappalyzerEnvDetection');

				script.innerHTML =
					'(function() {' +
						'try {' +
							'var i, environmentVars, event = document.createEvent("Events");' +
							'event.initEvent("wappalyzerEvent", true, false);' +
							'for ( i in window ) { environmentVars += i + " "; }' +
							'document.getElementById("wappalyzerData").appendChild(document.createComment(environmentVars));' +
							'document.getElementById("wappalyzerData").dispatchEvent(event);' +
						'}' +
						'catch(e) { }' +
					'})();';

				container.addEventListener('wappalyzerEvent', (function(event) {
					var environmentVars = event.target.childNodes[0].nodeValue;

					document.documentElement.removeChild(container);
					document.documentElement.removeChild(script);

					c.log('getEnvironmentVars: ' + environmentVars);

					environmentVars = environmentVars.split(' ');

					chrome.extension.sendRequest({ id: 'analyze', subject: { env: environmentVars } });
				}), true);

				document.documentElement.appendChild(container);
				document.documentElement.appendChild(script);
			} catch(e) {
				c.log('Error: ' + e);
			}
		}
	}

	c.init();
})();