JaySunSyn · January 21, 2018 12:48 · Jan 21, 2018
diff --git a/index.js b/index.js
@@ -0,0 +1,66 @@
+exports.host = functions.https.onRequest((req, res) => {
+	const userAgent = req.headers['user-agent'].toLowerCase();
+	let indexHTML = fs.readFileSync('./hosting/index.html').toString();
+	const path = req.path ? req.path.split('/') : req.path;
+	const ogPlaceholder = '<meta name="functions-insert-dynamic-og">';
+	const metaPlaceholder = '<meta name="functions-insert-dynamic-meta">';
+
+	const isBot = userAgent.includes('googlebot') ||
+		userAgent.includes('yahoou') ||
+		userAgent.includes('bingbot') ||
+		userAgent.includes('baiduspider') ||
+		userAgent.includes('yandex') ||
+		userAgent.includes('yeti') ||
+		userAgent.includes('yodaobot') ||
+		userAgent.includes('gigabot') ||
+		userAgent.includes('ia_archiver') ||
+		userAgent.includes('facebookexternalhit') ||
+		userAgent.includes('twitterbot') ||
+		userAgent.includes('developers\.google\.com') ? true : false;
+
+	if (isBot && (path && path.length > 1 && path[1] === 'organisation')) {
+		const slug = path[2];
+		admin.database().ref(`published/${slug}`).once('value').then(snapshot => {
+			const org = snapshot.val();
+			if (org) {
+				org.slug = slug;
+			}
+			indexHTML = indexHTML.replace(metaPlaceholder, getMeta(org));
+			indexHTML = indexHTML.replace(ogPlaceholder, getOpenGraph(org));
+			res.status(200).send(indexHTML);
+		});
+		return;
+	}
+
+	// optional - turn on caching: res.set('Cache-Control', 'public, max-age=300, s-maxage=600');
+	indexHTML = indexHTML.replace(metaPlaceholder, getMeta());
+	indexHTML = indexHTML.replace(ogPlaceholder, getOpenGraph());
+	res.status(200).send(indexHTML);
+});
+
+
+const defaultDesc = 'The mobsters, bootleggers and gangsters of the 1920s and 30s, such as Al Capone, Lucky Luciano, and Bugs Moran.';
+const defaultTitle = 'Original Gangsters';
+const defaultLogo = 'https://example.com/images/headerHQ.jpg';
+
+const getOpenGraph = (org) => {
+	let og = `<meta property="fb:app_id" content="921373517372" />`;
+	og += `<meta property="og:type" content="website" />`;
+
+	if (!org) {
+		og += `<meta property="og:title" content="${defaultTitle}" />`;
+		og += `<meta property="og:description" content="${defaultDesc}" />`;
+		og += `<meta property="og:image" content="${defaultLogo}" />`;
+		og += `<meta property="og:url" content="https://example.com" />`;
+		return og;
+	}
+	og += `<meta property="og:title" content="${org.name}" />`;
+	og += `<meta property="og:description" content="${org.desc || defDesc}" />`;
+	og += `<meta property="og:image" content="${org.logo_url || defLogo}" />`;
+	og += `<meta property="og:url" content="https://example.com/organisation/${org.slug}" />`;
+	return og;
+};
+
+const getMeta = (org) => {
+	// return other meta tags
+};