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import process from 'node:process';
import readline from 'node:readline';
import path from 'node:path';
import {fileURLToPath} from 'node:url';
import fileUpload from 'express-fileupload';
import express from 'express';
import dotenv from 'dotenv';
import bcrypt from 'bcrypt';
import {Low, JSONFile} from 'lowdb';
const register = process.argv.includes('register');
const db = new Low(new JSONFile('db.json'));
await db.read();
db.data ||= {tokens: [], users: []};
const tokens = db.data.tokens;
const users = db.data.users;
const app = express();
app.use(express.urlencoded({extended: true}));
app.use(fileUpload({limits: {fileSize: 100 * 1024 * 1024}, useTempFiles: true, tempFileDir: '/tmp/'}));
dotenv.config();
const PORT = Number(process.env.PORT) || 3000;
const TOKEN_LENGTH = Number(process.env.TOKEN_LENGTH) || 128;
const SALT_ROUNDS = Number(process.env.SALT_ROUNDS) || 14;
const UPLOAD_DIR = process.env.UPLOAD_DIR || `${path.dirname(fileURLToPath(import.meta.url))}/upload/`;
if (register) {
const input = readline.createInterface({input: process.stdin, output: process.stdout});
input.question('username: ', username => {
if (username.length < 4 || users.some(user => user.username === username)) {
console.log('> username is invalid');
input.close();
return;
}
input.question('password: ', plain => {
if (plain.length < 9) {
console.log('> password is too insecure');
input.close();
return;
}
console.log('hashing...');
bcrypt.hash(plain, SALT_ROUNDS, async (error, password) => {
if (error) {
console.error(error);
input.close();
return;
}
users.push({username, password, saved: []});
console.log('storing...');
await db.write();
input.close();
console.log('success!');
});
});
});
}
const auth = (request, response, next) => {
if (!request.headers.token || request.headers.token.length !== TOKEN_LENGTH || !tokens.some(tok => tok.data === request.headers.token)) {
return response.status(401).json({state: 'unauthorized', error: 'invalid token'});
}
next();
};
const token = n => {
const chars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
let token = '';
for (let i = 0; i < n; i++) {
token += chars[Math.floor(Math.random() * chars.length)];
}
return token;
};
const getUser = request => {
const token = tokens.find(tok => tok.data === request.headers.token);
if (!token) {
return undefined;
}
const user = users.find(user => user.username === token.username);
return user;
};
app.post('/login', (request, response) => {
if (!request.body.username || !request.body.password || !users.some(user => user.username === request.body.username)) {
return response.status(400).json({state: 'unauthorized', error: 'invalid parameters'});
}
const user = users.find(user => user.username === request.body.username);
if (!user || !user.password) {
return response.status(500).json({state: 'unauthorized', error: 'invalid password hash'});
}
const hash = user.password;
bcrypt.compare(request.body.password, hash).then(async authorized => {
if (!authorized) {
return response.status(401).json({state: 'unauthorized', error: 'invalid password'});
}
const tok = token(TOKEN_LENGTH);
// Indexing a token using a string instead of id is stupid but it's easier
tokens.push({username: user.username, data: tok});
await db.write();
response.json({state: 'authorized', token: tok, error: 'success'});
});
});
app.post('/text', auth, async (request, response) => {
const current = getUser(request);
if (!current || !request.body.data) {
return response.status(400).json({state: 'authorized', error: 'invalid parameters'});
}
current.saved.push({type: 'text', data: request.body.data});
await db.write();
response.json({state: 'authorized', error: 'success'});
});
app.post('/file', auth, (request, response) => {
const current = getUser(request);
if (!current) {
return response.status(500).json({state: 'authorized', error: 'invalid user'});
}
if (!request.files || Object.keys(request.files).length !== 1 || !request.files.file) {
return response.status(400).send({state: 'authorized', error: 'invalid file'});
}
const tok = token(16);
request.files.file.mv(UPLOAD_DIR + tok, async error => {
if (error) {
return response.status(500).send({state: 'authorized', error});
}
current.saved.push({type: 'file', name: request.files.file.name, mimetype: request.files.file.mimetype, token: tok});
await db.write();
response.json({state: 'authorized', error: 'success'});
});
});
app.get('/file/:token', auth, (request, response) => {
const current = getUser(request);
if (!current) {
return response.status(500).json({state: 'authorized', error: 'invalid user'});
}
const file = current.saved.find(file => file.type === 'file' && file.token === request.params.token);
if (!file) {
return response.status(404).json({state: 'authorized', error: 'file not found'});
}
response.download(UPLOAD_DIR + file.token, file.name, {maxAge: '10y', immutable: true});
});
app.get('/saved', auth, (request, response) => {
const current = getUser(request);
if (!current) {
return response.status(500).json({state: 'authorized', error: 'invalid user'});
}
response.json({state: 'authorized', error: 'success', data: current.saved});
});
app.get('/', auth, (_, response) => {
response.json({state: 'authorized', error: 'success'});
});
if (!register) {
app.listen(PORT, () => console.log(`listening on ${PORT}`));
}
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