101 lines
3.0 KiB
JavaScript
101 lines
3.0 KiB
JavaScript
const crypto = require('crypto');
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const fetch = require('node-fetch');
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const Vehicle = require('../models/vehicle');
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const DebugInfo = require('../models/DebugInfo');
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const Centrifuge = require('centrifuge');
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const SockJS = require('sockjs-client');
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const baseUrl = 'https://avtocod.ru/api/v3';
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let deviceToken = crypto.createHash('sha256').update(Date.now().toString()).digest().toString('hex');
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function fromBase64(data) {
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return Buffer.from(data, 'base64').toString('binary');
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}
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async function getPage(url) {
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let result = await fetch(url);
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return await result.text();
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}
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async function getJson(url) {
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let result = await fetch(url);
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return await result.json();
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}
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function decryptReport(report, hash) {
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let dataLength = report.length/2;
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let encryptedObject = JSON.parse(fromBase64(report.slice(-dataLength).concat(report.slice(0, -dataLength))));
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let iv = Buffer.from(encryptedObject.iv, 'base64');
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let data = Buffer.from(encryptedObject.value, 'base64');
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let key = crypto.createHash('sha256').update(hash).digest();
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let decipher = crypto.createDecipheriv('aes-256-cbc', key, iv);
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let decrypted = decipher.update(data);
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decrypted = Buffer.concat([decrypted, decipher.final()]);
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return JSON.parse(decrypted.toString());
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}
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function waitForReport(centrifugoConfig, channel) {
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return new Promise((resolve, reject) => {
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let report = null;
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let centrifuge = new Centrifuge(centrifugoConfig.uri, { sockjs: SockJS });
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let timeout = setTimeout(() => {
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centrifuge.disconnect();
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if(report != null) {
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resolve(report);
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} else {
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reject(new Error('Request to avtocod timed out'));
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}
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}, 10000);
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centrifuge.subscribe(channel, message => {
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if(message.data.event == 'report-ready') {
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clearTimeout(timeout);
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centrifuge.disconnect();
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resolve(message.data);
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} else if(message.data.event == 'report-updated') {
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report = message.data;
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}
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});
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centrifuge.setToken(centrifugoConfig.token);
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centrifuge.connect();
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});
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}
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class AvtocodProvider {
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static async getReport(number) {
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try {
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let url = `${baseUrl}/auto/generate?number=${encodeURIComponent(number)}&device_token=${deviceToken}`;
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let resp = await getJson(url);
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let html = await getPage(resp.report_uri);
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let result = html.match(/<meta name="app-version-hash" content="(.*?)" \/>/);
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if(result == null) {
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throw Error('Error getting api version hash');
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}
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let hash = result[1];
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result = html.match(/value:(.*report_container.*)/);
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if(result == null) {
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throw Error('Error getting report data');
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}
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let mainData = JSON.parse(result[1]);
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let report = decryptReport(mainData.report_container.report, hash);
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if(report == null) {
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report = await waitForReport(mainData.centrifugo, mainData.report_container.channel);
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}
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let vehicle = Vehicle.fromAvtocod(report);
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console.log('Avtocod found vehicle: ', vehicle?.brand?.name?.original);
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return vehicle;
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} catch(ex) {
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ex.debugInfo = { autocod: DebugInfo.fromError(ex.message) };
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throw ex;
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}
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}
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}
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module.exports = AvtocodProvider; |