VK_proxy_goods_get

'use strict'

const http = require('http');
const querystring = require('querystring');

const VK = {
	'groupId': {
		name: 'groups.getById',
		group_ids: 'boroda.land'
	}
};
const vkApiUrl = 'http://api.vk.com/method/' + VK.groupId.name + '?group_id=' + VK.groupId.group_ids;

http.createServer((servReq, servRes) => {

	http.get(vkApiUrl, (res) => {
		console.log('SERVER::GET: ' + vkApiUrl, res.statusCode);

		let body = '';
		res.on('data', (d) => { body += d; });
		res.on('end', () => {

			/// GROUP ID:
	 		var GID;
	 		const parsedResponse = JSON.parse(body).response;
	 		if (parsedResponse && parsedResponse[0] && parsedResponse[0].gid) {
				GID = -JSON.parse(body).response[0].gid;
	 		}

	 		console.log('GID: ' + GID);

	 					// Ogiginal POST query encoded:
	 					// const xhrBody = '_smt=market%3A6&al=1&id=-57616626&load=1&offset=42&price_from=&price_to=&q=&sort=0';

		    	const postData = querystring.stringify({
		    	    _smt: 'market:6',
		    	    al: 1,
		    	    id: GID,
		    	    load: 1,
		    	    offset: 0,
		    	    sort: 0
		    	});

				const postReqOptions = {
					hostname: 'vk.com',
					path: '/al_market.php',
					method: 'POST',
					headers: {
					    'Content-Type': 'application/x-www-form-urlencoded',
					    'Content-Length': Buffer.byteLength(postData),
				   		"origin":"http://vk.com",
					   	"referer": vkApiUrl
					}
				};

				const postReq = http.request(postReqOptions, (res) => {
			        console.log('SERVER::POST: ' + postReqOptions.hostname + postReqOptions.path, res.statusCode);

			        let vkData = '';
					res.on('data', (chunk) => {
						vkData += chunk;
					});

					res.on('end', () => {

						// parsing images from raw vk response
						const imgs = reFirstGroup(/src=(.*?\.jpg)/g, vkData);

						// making html
						let html = '';
						imgs.forEach((img) => {
							html += '<img src=' + img + '">';
						});

						// form server response with html
						servRes.writeHeader(200, {"Content-Type": "text/html"});
						servRes.end(html)

					});
				});

				postReq.write(postData);
				postReq.end();
		});

	});

}).listen(80);


// helpers
	// first matched group in regex
function reFirstGroup (re, str) {
	var match = re.exec(str);
	var arr = [];

	if (match && match[1]) arr.push(match[1])
	while (match != null) { 
		match = re.exec(str);
		if (match && match[1]) arr.push(match[1])
	}

	return arr;
}