mirror of https://github.com/tycrek/ass
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316 lines
12 KiB
316 lines
12 KiB
try {
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// Check if config.json exists
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require('./config.json');
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} catch (err) {
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console.error('No config.json found! Please run \'npm run setup\'');
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process.exit(1);
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}
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// Load the config
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const { host, port, maxUploadSize, useSsl, resourceIdSize, diskFilePath, gfyIdSize, resourceIdType, isProxied, s3enabled } = require('./config.json');
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//#region Imports
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const fs = require('fs-extra');
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const express = require('express');
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const helmet = require("helmet");
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const escape = require('escape-html');
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const rateLimit = require("express-rate-limit");
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const fetch = require('node-fetch');
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const marked = require('marked');
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const { DateTime } = require('luxon');
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const { WebhookClient, MessageEmbed } = require('discord.js');
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const { doUpload, deleteS3, processUploaded } = require('./storage');
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const { path, saveData, log, verify, getTrueHttp, getTrueDomain, generateToken, generateId, formatBytes,
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formatTimestamp, arrayEquals, getS3url, getDirectUrl, getSafeExt, getResourceColor, replaceholder } = require('./utils');
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const { CODE_NO_CONTENT, CODE_BAD_REQUEST, CODE_UNAUTHORIZED, CODE_NOT_FOUND, CODE_PAYLOAD_TOO_LARGE, CODE_INTERNAL_SERVER_ERROR } = require('./MagicNumbers.json');
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//#endregion
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//#region Variables, module setup
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const ASS_LOGO = 'https://cdn.discordapp.com/icons/848274994375294986/8d339d4a2f3f54b2295e5e0ff62bd9e6.png?size=1024';
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const app = express();
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// Configure filename and location settings
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let users = {};
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let data = {};
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//#endregion
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/**
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* Operations to run to ensure ass can start properly
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*/
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function preStartup() {
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// Make sure data.json exists
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if (!fs.existsSync(path('data.json'))) {
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fs.writeJsonSync(path('data.json'), data, { spaces: 4 });
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log('File [data.json] created');
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} else log('File [data.json] exists');
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// Make sure auth.json exists and generate the first key
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if (!fs.existsSync(path('auth.json'))) {
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const token = generateToken();
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users[token] = { username: 'ass', count: 0 };
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fs.writeJsonSync(path('auth.json'), { users }, { spaces: 4 });
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log(`File [auth.json] created\n!! Important: save this token in a secure spot: ${Object.keys(users)[0]}\n`);
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} else log('File [auth.json] exists');
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// Read users and data
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users = fs.readJsonSync(path('auth.json')).users || {};
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data = fs.readJsonSync(path('data.json'));
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log('Users & data read from filesystem');
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// Monitor auth.json for changes (triggered by running 'npm run new-token')
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fs.watch(path('auth.json'), { persistent: false }, (eventType) => eventType === 'change' && fs.readJson(path('auth.json'))
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.then((json) => !(arrayEquals(Object.keys(users), Object.keys(json.users))) && (users = json.users) && log(`New token added: ${Object.keys(users)[Object.keys(users).length - 1]}`)) // skipcq: JS-0243
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.catch(console.error));
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// Create thumbnails directory
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fs.ensureDirSync(path(diskFilePath, 'thumbnails'));
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}
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/**
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* Builds the router
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* ///todo: make this separate
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*/
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function startup() {
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// Enable/disable Express features
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app.enable('case sensitive routing');
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app.disable("x-powered-by");
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// Set Express variables
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app.set('trust proxy', isProxied);
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app.set('view engine', 'pug');
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// Helmet security middleware
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app.use(helmet.noSniff());
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app.use(helmet.ieNoOpen());
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app.use(helmet.xssFilter());
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app.use(helmet.referrerPolicy());
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app.use(helmet.dnsPrefetchControl());
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useSsl && app.use(helmet.hsts({ preload: true })); // skipcq: JS-0093
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// Rate limit middleware
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app.use(rateLimit({
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windowMs: 1000 * 60, // 60 seconds // skipcq: JS-0074
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max: 90 // Limit each IP to 30 requests per windowMs // skipcq: JS-0074
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}));
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// Don't process favicon requests (custom middleware)
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app.use((req, res, next) => (req.url.includes('favicon.ico') ? res.sendStatus(CODE_NO_CONTENT) : next()));
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// Index
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app.get('/', (_req, res, next) =>
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fs.readFile(path('README.md'))
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.then((bytes) => bytes.toString())
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.then(marked)
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.then((d) => res.render('index', { data: d }))
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.catch(next));
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// Block unauthorized requests and attempt token sanitization
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app.post('/', (req, res, next) => {
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req.headers.authorization = req.headers.authorization || '';
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req.token = req.headers.authorization.replace(/[^\da-z]/gi, ''); // Strip anything that isn't a digit or ASCII letter
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!verify(req, users) ? res.sendStatus(CODE_UNAUTHORIZED) : next(); // skipcq: JS-0093
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});
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// Upload file
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app.post('/', doUpload, processUploaded, ({ next }) => next());
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app.use('/', (err, _req, res, next) => err.code && err.code === 'LIMIT_FILE_SIZE' ? res.status(CODE_PAYLOAD_TOO_LARGE).send(`Max upload size: ${maxUploadSize}MB`) : next(err)); // skipcq: JS-0229
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// Process uploaded file
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app.post('/', (req, res) => {
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// Load overrides
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const trueDomain = getTrueDomain(req.headers["x-ass-domain"]);
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const generator = req.headers["x-ass-access"] || resourceIdType;
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// Get the uploaded time in milliseconds
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req.file.timestamp = DateTime.now().toMillis();
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// Keep track of the token that uploaded the resource
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req.file.token = req.token;
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// Attach any embed overrides, if necessary
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req.file.opengraph = {
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title: req.headers['x-ass-og-title'],
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description: req.headers['x-ass-og-description'],
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author: req.headers['x-ass-og-author'],
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authorUrl: req.headers['x-ass-og-author-url'],
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provider: req.headers['x-ass-og-provider'],
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providerUrl: req.headers['x-ass-og-provider-url'],
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color: req.headers['x-ass-og-color']
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};
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// Save the file information
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const resourceId = generateId(generator, resourceIdSize, req.headers['x-ass-gfycat'] || gfyIdSize, req.file.originalname);
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data[resourceId.split('.')[0]] = req.file;
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saveData(data);
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// Log the upload
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const logInfo = `${req.file.originalname} (${req.file.mimetype})`;
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log(`Uploaded: ${logInfo} (user: ${users[req.token] ? users[req.token].username : '<token-only>'})`);
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// Build the URLs
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const resourceUrl = `${getTrueHttp()}${trueDomain}/${resourceId}`;
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const thumbnailUrl = `${getTrueHttp()}${trueDomain}/${resourceId}/thumbnail`;
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const deleteUrl = `${getTrueHttp()}${trueDomain}/${resourceId}/delete/${req.file.deleteId}`;
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// Send the response
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res.type('json').send({ resource: resourceUrl, thumbnail: thumbnailUrl, delete: deleteUrl })
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.on('finish', () => {
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// After we have sent the user the response, also send a Webhook to Discord (if headers are present)
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if (req.headers['x-ass-webhook-client'] && req.headers['x-ass-webhook-token']) {
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// Build the webhook client & embed
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const whc = new WebhookClient(req.headers['x-ass-webhook-client'], req.headers['x-ass-webhook-token']);
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const embed = new MessageEmbed()
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.setTitle(logInfo)
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.setURL(resourceUrl)
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.setDescription(`**Size:** \`${formatBytes(req.file.size)}\`\n**[Delete](${deleteUrl})**`)
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.setThumbnail(thumbnailUrl)
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.setColor(req.file.vibrant)
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.setTimestamp(req.file.timestamp);
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// Send the embed to the webhook, then delete the client after to free resources
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whc.send(null, {
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username: req.headers['x-ass-webhook-username'] || 'ass',
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avatarURL: req.headers['x-ass-webhook-avatar'] || ASS_LOGO,
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embeds: [embed]
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}).then(() => whc.destroy());
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}
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// Also update the users upload count
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if (!users[req.token]) {
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const generateUsername = () => generateId('random', 20, null); // skipcq: JS-0074
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let username = generateUsername();
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while (Object.values(users).findIndex((user) => user.username === username) !== -1) // skipcq: JS-0073
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username = generateUsername();
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users[req.token] = { username, count: 0 };
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}
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users[req.token].count += 1;
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fs.writeJsonSync(path('auth.json'), { users }, { spaces: 4 })
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});
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});
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// Middleware for parsing the resource ID and handling 404
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app.use('/:resourceId', (req, res, next) => {
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// Parse the resource ID
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req.ass = { resourceId: escape(req.params.resourceId).split('.')[0] };
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// If the ID is invalid, return 404. Otherwise, continue normally // skipcq: JS-0093
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(!req.ass.resourceId || !data[req.ass.resourceId]) ? res.sendStatus(CODE_NOT_FOUND) : next();
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});
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// View file
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app.get('/:resourceId', (req, res) => {
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const { resourceId } = req.ass;
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const fileData = data[resourceId];
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const isVideo = fileData.mimetype.includes('video');
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// Build OpenGraph meta tags
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const og = fileData.opengraph, ogs = [''];
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og.title && (ogs.push(`<meta property="og:title" content="${og.title}">`)); // skipcq: JS-0093
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og.description && (ogs.push(`<meta property="og:description" content="${og.description}">`)); // skipcq: JS-0093
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og.author && (ogs.push(`<meta property="og:site_name" content="${og.author}">`)); // skipcq: JS-0093
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og.color && (ogs.push(`<meta name="theme-color" content="${getResourceColor(og.color, fileData.vibrant)}">`)); // skipcq: JS-0093
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!isVideo && (ogs.push(`<meta name="twitter:card" content="summary_large_image">`)); // skipcq: JS-0093
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// Send the view to the client
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res.render('view', {
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isVideo,
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title: escape(fileData.originalname),
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uploader: users[fileData.token].username,
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timestamp: formatTimestamp(fileData.timestamp),
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size: formatBytes(fileData.size),
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color: getResourceColor(fileData.opengraph.color || null, fileData.vibrant),
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resourceAttr: { src: getDirectUrl(resourceId) },
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discordUrl: `${getDirectUrl(resourceId)}${getSafeExt(fileData.mimetype)}`,
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oembedUrl: `${getTrueHttp()}${getTrueDomain()}/${resourceId}/oembed.json`,
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ogtype: isVideo ? 'video.other' : 'image',
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urlType: `og:${isVideo ? 'video' : 'image'}`,
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opengraph: replaceholder(ogs.join('\n'), fileData)
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});
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});
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// Direct resource
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app.get('/:resourceId/direct*', (req, res) => {
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const { resourceId } = req.ass;
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const fileData = data[resourceId];
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// Return the file differently depending on what storage option was used
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const uploaders = {
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s3: () => fetch(getS3url(fileData.randomId, fileData.mimetype)).then((file) => {
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file.headers.forEach((value, header) => res.setHeader(header, value));
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file.body.pipe(res);
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}),
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local: () => {
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res.header('Accept-Ranges', 'bytes').header('Content-Length', fileData.size).type(fileData.mimetype);
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fs.createReadStream(fileData.path).pipe(res);
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}
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};
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uploaders[s3enabled ? 's3' : 'local']();
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});
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// Thumbnail response
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app.get('/:resourceId/thumbnail', (req, res) => {
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const { resourceId } = req.ass;
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// Read the file and send it to the client
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fs.readFile(path(diskFilePath, 'thumbnails/', data[resourceId].thumbnail))
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.then((fileData) => res.type('jpg').send(fileData))
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.catch(console.error);
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});
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// oEmbed response for clickable authors/providers
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// https://oembed.com/
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// https://old.reddit.com/r/discordapp/comments/82p8i6/a_basic_tutorial_on_how_to_get_the_most_out_of/
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app.get('/:resourceId/oembed.json', (req, res) => {
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const { resourceId } = req.ass;
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// Build the oEmbed object & send the response
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const { opengraph, mimetype } = data[resourceId];
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res.type('json').send({
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version: '1.0',
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type: mimetype.includes('video') ? 'video' : 'photo',
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author_url: opengraph.authorUrl,
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provider_url: opengraph.providerUrl,
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author_name: replaceholder(opengraph.author || '', data[resourceId]),
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provider_name: replaceholder(opengraph.provider || '', data[resourceId])
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});
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});
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// Delete file
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app.get('/:resourceId/delete/:deleteId', (req, res) => {
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const { resourceId } = req.ass;
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const deleteId = escape(req.params.deleteId);
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const fileData = data[resourceId];
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// If the delete ID doesn't match, don't delete the file
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if (deleteId !== fileData.deleteId) return res.sendStatus(CODE_UNAUTHORIZED);
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// If the ID is invalid, return 400 because we are unable to process the resource
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if (!resourceId || !fileData) return res.sendStatus(CODE_BAD_REQUEST);
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log(`Deleted: ${fileData.originalname} (${fileData.mimetype})`);
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// Save the file information
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Promise.all([s3enabled ? deleteS3(fileData) : fs.rmSync(path(fileData.path)), fs.rmSync(path(diskFilePath, 'thumbnails/', fileData.thumbnail))])
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.then(() => {
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delete data[resourceId];
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saveData(data);
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res.type('text').send('File has been deleted!');
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})
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.catch(console.error);
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});
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app.use(([err, , res,]) => {
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console.error(err);
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res.sendStatus(CODE_INTERNAL_SERVER_ERROR);
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});
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// Host the server
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app.listen(port, host, () => log(`Server started on [${host}:${port}]\nAuthorized users: ${Object.keys(users).length}\nAvailable files: ${Object.keys(data).length}`));
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}
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preStartup();
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startup();
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