Klemek
329 lines
11 KiB
JavaScript
329 lines
11 KiB
JavaScript
const express = require('express');
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const app = express();
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const fs = require('fs');
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const path = require('path');
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const pjson = require('../package.json');
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const rateLimit = require('express-rate-limit');
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app.enable('trust proxy');
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//rss
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const Rss = require('rss');
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///webhook
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const bodyParser = require('body-parser');
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const crypto = require('crypto');
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const cp = require('child_process');
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app.use(bodyParser.json());
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/**
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* Terminal colors and symbols to display status messages
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* @type {{warn: string, ok: string, error: string}}
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*/
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const cons = {
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ok: '\x1b[32m✔\x1b[0m %s',
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warn: '\x1b[33m⚠\x1b[0m %s',
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error: '\x1b[31m✘\x1b[0m %s',
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};
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module.exports = (config) => {
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/**
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* Fetch articles from the data folder and send success as a response
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* @param success
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* @param error
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*/
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let reload;
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/**
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* Render the page with the view engine and catch errors
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* @param req
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* @param res
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* @param vPath - path of the view
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* @param data - data to pass to the view
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* @param code - code to send along the page
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*/
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let render;
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/**
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* Show an error with the correct page
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* @param req
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* @param res
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* @param code - error code
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*/
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let showError;
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const fw = require('./file_walker')(config);
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const renderer = require('./renderer')(config);
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const hc = require('./hit_counter')(config);
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// set view engine from configuration
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app.set('view engine', config['view_engine']);
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// reroute the views folder to the root folder
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app.set('views', path.join(__dirname, '..'));
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const articles = {};
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let lastRSS = '';
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let host = config['host'];
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reload = (success, error) => {
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fw.fetchArticles((err, dict) => {
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if (err) {
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console.error(cons.error, 'error loading articles : ' + err);
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error();
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} else {
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Object.keys(articles).forEach((key) => delete articles[key]);
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Object.keys(dict).forEach((key) => articles[key] = dict[key]);
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const nb = Object.keys(articles).length;
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const dnb = Object.values(articles).filter(a => a.draft).length;
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if (nb > 0) {
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console.log(cons.ok, `loaded ${nb} article${nb > 1 ? 's' : ''} (${dnb} drafted)`);
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} else {
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console.log(cons.warn, 'no articles loaded, check your configuration');
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}
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lastRSS = '';
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success();
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}
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});
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};
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if (config['test']) {
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app.reload = reload;
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}
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render = (req, res, vPath, data, code = 200) => {
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data.info = {
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title: config['home']['title'],
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description: config['home']['description'],
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host: host,
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version: pjson.version,
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request: req,
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config: config,
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};
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res.render(vPath, data, (err, html) => {
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if (err && vPath !== path.join(config['data_dir'], config['home']['error'])) {
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console.log(cons.error, `failed to render page ${vPath} : ${err}`);
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showError(req, res, 500);
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} else if (err) {
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res.sendStatus(500);
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console.log(cons.error, `failed to render error page : ${err}`);
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} else {
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res.status(code).send(html);
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}
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});
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};
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showError = (req, res, code) => {
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const errorPath = path.join(config['data_dir'], config['home']['error']);
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fs.access(errorPath, fs.constants.R_OK, (err) => {
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if (err) {
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res.sendStatus(code);
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} else {
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render(req, res, errorPath, { error: code }, code);
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}
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});
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};
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app.use((req, res, next) => {
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if (!host) {
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host = 'http://' + req.headers.host;
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console.log(cons.ok, 'Currently hosted on ' + host);
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}
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next();
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});
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//rate limit for safer server
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const limiter = rateLimit({
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windowMs: 15 * 60 * 1000, // 15 minutes
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max: config['rate_limit'],
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});
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app.use(limiter);
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//log request at result end
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app.use((req, res, next) => {
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if (config['access_log']) {
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const end = res.end;
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res.end = (chunk, encoding) => {
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fs.appendFile(config['access_log'],
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`${res.statusCode} ${req.method} ${req.url} ${new Date().toUTCString()} ${req.ips.join(' ') || req.ip}\n`,
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{ encoding: 'UTF-8' }, () => {
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res.end = end;
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res.end(chunk, encoding);
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});
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};
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}
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next();
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});
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// home endpoint : send the correct index page or error if not existing
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app.get('/', (req, res) => {
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const homePath = path.join(config['data_dir'], config['home']['index']);
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fs.access(homePath, fs.constants.R_OK, (err) => {
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if (err) {
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showError(req, res, 404);
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} else {
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hc.count(req, '/');
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render(req, res, homePath,
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{
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articles: Object.values(articles)
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.filter(d => !d.draft)
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.sort((a, b) => ('' + b.path).localeCompare(a.path)),
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});
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}
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});
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});
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app.get('/stats', (req, res) => {
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const data = hc.read('/');
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res.json({
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hits: data.hits,
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visitors: data.visitors,
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});
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});
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//RSS endpoint
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app.get(config['rss']['endpoint'], (req, res) => {
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if (config['modules']['rss']) {
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if (!lastRSS) {
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const feed = new Rss({
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title: config['rss']['title'],
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description: config['rss']['description'],
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feed_url: host + req.url,
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site_url: host,
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});
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Object.values(articles)
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.slice(0, config['rss']['length'])
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.forEach((article) => {
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feed.item({
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title: article.title,
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url: host + article.url,
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date: article.date,
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});
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});
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lastRSS = feed.xml();
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}
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res.type(req.headers['user-agent'].match(/Mozilla/) ? 'text/xml' : 'rss').send(lastRSS);
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} else {
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showError(req, res, 404);
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}
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});
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//webhook endpoint
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app.post(config['webhook']['endpoint'], (req, res) => {
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if (config['modules']['webhook']) {
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let valid = true;
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if (config['webhook']['signature_header'] && config['webhook']['secret']) {
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const payload = JSON.stringify(req.body) || '';
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const hmac = crypto.createHmac('sha1', config['webhook']['secret']);
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const digest = 'sha1=' + hmac.update(payload).digest('hex');
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const checksum = req.headers[config['webhook']['signature_header']];
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if (!checksum || !digest || checksum !== digest) {
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res.sendStatus(403);
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valid = false;
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}
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}
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if (valid) {
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cp.exec(config['webhook']['pull_command'], { cwd: path.join(__dirname, '..', config['data_dir']) }, (err) => {
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if (err) {
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console.log(cons.error, `command '${config['webhook']['pull_command']}' failed : ${err}`);
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res.sendStatus(500);
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} else {
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reload(() => {
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res.sendStatus(200);
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});
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}
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});
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}
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} else {
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res.sendStatus(400);
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}
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});
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//rewrite urls to hide articles titles : /2019/05/05/sometitle/img.png => /2019/05/05/img.png
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app.use((req, res, next) => {
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if (/^\/\d{4}\/\d{2}\/\d{2}\//.test(req.url)) {
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req.url = req.url.slice(0, 11) + req.url.slice(req.url.lastIndexOf('/'));
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}
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next();
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});
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// catch all article urls and render them
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app.get('*', (req, res, next) => {
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if (/^\/\d{4}\/\d{2}\/\d{2}\/(stats)?$/.test(req.path)) {
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const articlePath = req.path.substr(1, 10);
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const article = articles[articlePath];
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if (!article) {
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showError(req, res, 404);
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} else if (req.path.endsWith('stats')) {
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const data = hc.read(articlePath);
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res.json({
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hits: data.hits,
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visitors: data.visitors,
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});
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} else {
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hc.count(req, articlePath);
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renderer.render(article.realPath, (err, html) => {
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if (err) {
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console.log(cons.error, `failed to render article ${req.path} : ${err}`);
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showError(req, res, 500);
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} else {
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article.content = html;
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const templatePath = path.join(config['data_dir'], config['article']['template']);
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fs.access(templatePath, fs.constants.R_OK, (err) => {
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if (err) {
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console.log(cons.error, `no template found at ${templatePath}`);
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showError(req, res, 500);
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} else {
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render(req, res, templatePath, { article: article });
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}
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});
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}
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});
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}
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} else {
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next();
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}
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});
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// catch all hidden file type and return 404
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config['home']['hidden'].forEach(pathMatcher => {
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app.get(pathMatcher, (req, res) => {
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showError(req, res, 404);
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});
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});
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// serve all static files via get
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app.get('*', express.static(path.join(__dirname, '..', config['data_dir'])));
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// catch express.static errors (mostly not found) by displaying 404
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app.get('*', (req, res) => {
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showError(req, res, 404);
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});
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// catch all other methods and return 400
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app.all('*', (req, res) => {
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res.status(400).send('bad request');
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});
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//log all server errors
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app.use((err, req, res, next) => {
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console.log(cons.error, `error when handling ${req.method} ${req.path} request : ${err}`);
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if (!config['error_log']) {
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next(err);
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}
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fs.appendFile(config['error_log'],
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`500 ${req.method} ${req.url} ${new Date().toUTCString()} ${req.ips.join(' ') || req.ip}\n${err.stack}\n`,
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{ encoding: 'UTF-8' }, () => {
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next(err);
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});
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});
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// must be use in a server.js to start the server
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app.start = () => {
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reload(() => {
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app.listen(config['node_port'], () => {
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console.log(cons.ok, `gitblog.md server listening on port ${config['node_port']}`);
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});
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});
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};
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return app;
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};
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