Merge branch 'expandable-server'

lib/linkPreview/index.js

@@ -10,7 +10,7 @@ let previewPatterns =
 	      return require(path.join(__dirname, 'patterns', file));
 	  });
 
-module.exports =  async function linkPreview(url = '') {
+module.exports =  async function linkPreview(url) {
 	let previewData;
 
 	for(let pattern of previewPatterns) {

lib/linkPreview/patterns/amazon.js

@@ -0,0 +1,49 @@
+let ejs = require('ejs');
+let cheerio = require('cheerio');
+let axios = require('axios');
+
+module.exports = {
+	matches (url) {
+		let amazonRegExp = /^(https?:\/\/(www\.)?(smile.)?(amazon|amzn)\.(com|com\.au|com\.br|ca|cn|fr|de|in|it|co\.jp|com\.mx|nl|es|co\.uk)\/(gp\/product|[A-Z0-9-]+\/dp)\/[A-Z0-9]+)/i;
+		return url.match(amazonRegExp);
+	},
+	async getPreviewData (link_url) {
+		try {
+			let res = await axios.get(link_url);
+			let $ = cheerio.load(res.data);
+
+			data = {
+				title: $('#productTitle').text().trim(),
+				description: $('meta[name="description"]').attr('content').trim(),
+				url: this.matches(link_url)[0]
+			}
+			
+			let image = $('#landingImage').data('old-hires');
+			if(image) data.image = image;
+
+			let price = $('#priceblock_ourprice').text();
+			let stars = $('.a-icon.a-icon-star .a-icon-alt').first().text();
+			if(stars ||price) {
+				let reviewUrl = data.url + '#customerReviews';
+				let partialTemplate = `
+					<% if (stars) { %>
+						<a href='<%= reviewUrl %>' target='_blank' rel='noopener noreferer'>
+							<%= stars%>
+						</a>
+						&nbsp; | &nbsp;
+					<% } %>
+					<% if (price) { %>
+						<%= price %>
+					<% } %>
+				`;
+
+				data.partial = ejs.render(partialTemplate, { reviewUrl, stars, price })
+			}
+
+			return data;
+		} catch (e) {
+			console.log(e)
+			return null;
+		}
+	}
+};

routes/link_preview.js

@@ -6,7 +6,9 @@ const Errors = require('../lib/errors.js');
 
 router.get('/', async (req, res, next) => {
 	try {
-		let HTML = await linkPreview(req.query.url);
+		let url = req.query.url;
+
+		let HTML = url ? await linkPreview(url) : '';
 		res.send(HTML);
 	} catch (e) {
 		next(e);

test/link_preview.js

@@ -12,6 +12,7 @@ let linkPreview = require('../lib/linkPreview');
 let github = require('../lib/linkPreview/patterns/github');
 let wikipedia = require('../lib/linkPreview/patterns/wikipedia');
 let twitter = require('../lib/linkPreview/patterns/twitter');
+let amazon = require('../lib/linkPreview/patterns/amazon');
 
 const Errors = require('../lib/errors.js');
 
@@ -150,4 +151,41 @@ describe('link_expansion', () => {
 			HTML.should.have.length.above(0);
 		});
 	});
+
+	describe('Amazon', () => {
+		it('should match a valid Amazon url', () => {
+			amazon.matches('https://www.amazon.co.uk/gp/product/0199858616').should.not.be.null;
+			amazon.matches('https://smile.amazon.co.uk/gp/product/0199858616').should.not.be.null;
+			amazon.matches('https://www.amazon.co.uk/Betron-Isolating-Earphones-Headphones-Microphone-Black/dp/B01N1X4910').should.not.be.null;
+			amazon.matches('http://amazon.co.uk/Sony-5-5-Inch-Android-SIM-Free-Smartphone-Gold/dp/B0792GT5T4/ref=dfg').should.not.be.null;
+			
+			expect(amazon.matches('https://www.amazon.co.uk/gp/dmusic/promotions/AmazonMusicUnlimited')).to.be.null;
+			expect(amazon.matches('https://www.amazon.co.uk/')).to.be.null;
+		});
+
+		it('should return a correct data object', async () => {
+			let data = await amazon.getPreviewData(
+				`https://www.amazon.co.uk/gp/product/B005G39HUK/ref=s9u_ri_gw_i2?ie=UTF8&fpl=fresh&pd_rd_i=B005G39HUK&pd_rd_r=4edec2c7-2abc-11e8-9a21-019e4b2648c4&pd_rd_w=jtpWg&pd_rd_wg=lyBTu&pf_rd_m=A3P5ROKL5A1OLE&pf_rd_s=&pf_rd_r=8G2NPHM6AE411J2M0V6Z&pf_rd_t=36701&pf_rd_p=81d63d24-31ce-4958-9c19-bb66b139bc25&pf_rd_i=desktop`
+			);
+
+			data.should.have.property(
+				'description',
+				"Fruit of the Loom Men's Super Premium Short Sleeve T-Shirt: Free UK Shipping on Orders Over £10 and Free 30-Day Returns on Selected Fashion Items sold or fulfilled by Amazon."
+			);
+			data.should.have.property(
+				'url',
+				'https://www.amazon.co.uk/gp/product/B005G39HUK'
+			);
+			data.should.have.property(
+				'title',
+				"Fruit of the Loom Men's Super Premium Short Sleeve T-Shirt"
+			);
+			data.should.have.property(
+				'image',
+				'https://images-na.ssl-images-amazon.com/images/I/91q6n9sLPsL._UL1500_.jpg'
+			);
+			data.partial.includes('4.4 out of 5 stars').should.be.true;
+			data.partial.includes('£1.20 - £19.99').should.be.true;
+		});
+	});
 })