fetchExternalPageAndParseDOMTask.js
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fetchExternalPageAndParseDOMTask.js
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	/* -------------------------------------------------------------
	Nasqueron API - datasources
	- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
	Author: Sébastien Santoro aka Dereckson
	Licence: BSD-2-Clause
	------------------------------------------------------------- */

	"use strict";

	const cheerio = require('cheerio');
	const domhandler = require("domhandler");
	const htmlparser2 = require('htmlparser2');
	const http = require("http");

	/* -------------------------------------------------------------
	* :: Handle DOM operations
	* :: Fetch HTML page and send it to parser
	* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */

	class fetchExternalPageAndParseDOMTask {
	constructor(url, sendResponseCallBack) {
	this.url = url;
	this.sendResponse = sendResponseCallBack;
	}

	run(res) {
	const parser = this.getParser(res);
	this.fetchExternalPage(res, parser);
	}

	getParser (res) {
	let that = this;

	return new htmlparser2.Parser(new domhandler.DomHandler(function(error, dom) {
	if (error) {
	console.error("DOM error: " + error);
	res.status(500).end("Can't parse changelog.");
	return;
	}

	that.sendResponse(res, cheerio.load(dom));
	}));
	}

	fetchExternalPage (res, parser) {
	http.get(this.url, function(externalResponse) {
	if (externalResponse.statusCode !== 200) {
	console.error("Error: " + externalResponse.statusMessage);
	res.status(500).end("Can't fetch changelog.");
	return;
	}

	externalResponse.setEncoding('utf8');
	externalResponse.on('data', (chunk) => { parser.write(chunk); });
	externalResponse.on('end', () => { parser.end(); });
	});
	}
	}

	module.exports = fetchExternalPageAndParseDOMTask;

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