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Merge pull request #9 from mellodoot/dev

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fixes #7, adds new features!
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the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<https://www.gnu.org/licenses/why-not-lgpl.html>.

15
OpenTerminal.service
View file

@ -1,15 +0,0 @@
[Unit]
Description=OpenTerminal Server
After=network.target
[Service]
Environment="PORT=443"
Environment="SSL_CERT=/certs/arimelody.me/arimelody.me.crt"
Environment="SSL_KEY=/certs/arimelody.me/arimelody.me.key"
Type=simple
ExecStart=/usr/bin/node /srv/openterminal/server/main.js
WorkingDirectory=/srv/openterminal
Restart=on-failure
[Install]
WantedBy=multi-user.target

17
README.md
View file

@ -1,4 +1,5 @@
# OpenTerminal # OpenTerminal
An online terminal and communal text buffer An online terminal and communal text buffer
![openterminal thumbnail image](public/img/thumbnail.png) ![openterminal thumbnail image](public/img/thumbnail.png)
@ -15,13 +16,25 @@ jokes aside- while i do absolutely see how an open, self-moderated text buffer i
...or maybe it'll just become a garbage-posting haven. regardless, it's a fun little idea, so i made it anyway. ...or maybe it'll just become a garbage-posting haven. regardless, it's a fun little idea, so i made it anyway.
## hosting
- `git clone` this repo and `cd` into it
- `npm ci` to install dependencies
- `npm run start`, and you should be good to do!
alternatively, you can `git clone` this repo and `docker build` a container if you like. we do not yet have official openterminal images on a public repo, sorry!
OpenTerminal also makes use of environment variables for server hosts who want a bit more control of their setup:
- `OPENTERM_HOST` - the address to bind OpenTerminal's http and websocket server. (default 0.0.0.0)
- `OPENTERM_POST` - the port to bind OpenTerminal's http and websocket server. (default 8080)
- `OPENTERM_TRUSTED_PROXIES` - a comma-separated list of addresses to check for `X-Forwarded-For` headers from. handy if you run OpenTerminal behind a reverse proxy! (default none, example `"127.0.0.1,192.168.0.100"`)
## roadmap ## roadmap
- rewrite backend in go/rust (me no like javascript raaaahhh) - rewrite backend in go/rust (me no like javascript raaaahhh)
- multiple "channels" (at least if one gets flooded, there's somewhere else you can go)
- master server (anyone can host a channel and post to the MS) - master server (anyone can host a channel and post to the MS)
### "maybe" roadmap ### "maybe" roadmap
- channel logs (for recovery in the event of a crash, as an optional feature) - channel logs (for recovery in the event of a crash, as an optional feature)

9
docker-compose-example.yml
View file

@ -5,10 +5,9 @@ services:
image: openterminal image: openterminal
container_name: openterminal container_name: openterminal
ports: ports:
- 443:443 - 8080:8080
volumes:
- ./certs/cert.crt:/srv/openterminal/certs/cert.crt
- ./certs/cert.key:/srv/openterminal/certs/cert.key
environment: environment:
PORT: 443 OPENTERM_HOST: 0.0.0.0
OPENTERM_PORT: 8080
# OPENTERM_TRUSTED_PROXIES: 127.0.0.1,192.168.0.100
restart: unless-stopped restart: unless-stopped

1
public/index.html
View file

@ -49,6 +49,7 @@
<ul> <ul>
<li><a href="https://github.com/mellodoot/openterminal/issues" target="_blank">issues</a></li> <li><a href="https://github.com/mellodoot/openterminal/issues" target="_blank">issues</a></li>
<li><a href="https://github.com/mellodoot/openterminal" target="_blank">source</a></li> <li><a href="https://github.com/mellodoot/openterminal" target="_blank">source</a></li>
<li id="version">loading...</li>
</ul> </ul>
</footer> </footer>
<div id="dialog-backdrop"></div> <div id="dialog-backdrop"></div>

36
public/scripts/main.js
View file

@ -2,6 +2,8 @@ import * as Terminal from "./terminal.js";
import * as Visual from "./visual.js"; import * as Visual from "./visual.js";
document.addEventListener("DOMContentLoaded", () => { document.addEventListener("DOMContentLoaded", () => {
document.getElementById("version").textContent = Terminal.VERSION;
Visual.bind(); Visual.bind();
Terminal.start(); Terminal.start();
@ -56,3 +58,37 @@ document.addEventListener("DOMContentLoaded", () => {
}); });
}); });
/**
* requests that the user confirm they wish to connect to an insecure (ws://) server.
* @returns a promise returning `true` or `false` based on user input.
*/
export async function user_confirm_insecure() {
const warn_dialog = document.getElementById("warn-dialog");
const warn_close = warn_dialog.getElementsByClassName("dialog-close").item(0);
const dialog_backdrop = document.getElementById("dialog-backdrop");
const warn_proceed = document.getElementById("warn-proceed");
const warn_cancel = document.getElementById("warn-cancel");
warn_dialog.classList.add("show");
dialog_backdrop.classList.add("show");
const user_input = await new Promise((Resolve, Reject) => {
warn_close.addEventListener('click', () => {
Resolve(false);
});
warn_cancel.addEventListener('click', () => {
warn_close.click();
});
dialog_backdrop.addEventListener("click", () => {
warn_close.click();
});
warn_proceed.addEventListener('click', () => {
Resolve(true);
});
});
warn_dialog.classList.remove("show");
dialog_backdrop.classList.remove("show");
return user_input;
}

156
public/scripts/terminal.js
View file

@ -1,12 +1,18 @@
var recv_buffer = []; import { user_confirm_insecure } from "./main.js";
var send_buffer = [];
var content; export const VERSION = "1.1.0";
var server_indicator;
var mobile_input; const foreground = localStorage.getItem("foreground");
const background = localStorage.getItem("background");
const content = document.getElementById("content");
const server_indicator = document.getElementById("server-url");
const mobile_input = document.getElementById("mobile-input");
var client; var client;
var recv_buffer = [];
var send_buffer = [];
var my_colour = false; var my_colour = false;
var pre_buffer_chars = 0; var pre_buffer_chars = 0;
var server_url = ""; var server_url = "";
@ -20,6 +26,7 @@ const DATA_TYPES = {
backspace: 4, backspace: 4,
backword: 5, backword: 5,
arrow: 6, arrow: 6,
version: 7,
}; };
/** /**
@ -49,8 +56,6 @@ to help you feel a little more comfortable, i've prepared some commands for you:
server_url = new URL(window.location).searchParams.get("server") || window.location.host; server_url = new URL(window.location).searchParams.get("server") || window.location.host;
const foreground = localStorage.getItem("foreground");
const background = localStorage.getItem("background");
if (foreground && background) { if (foreground && background) {
window.set_colours(foreground, background); window.set_colours(foreground, background);
} }
@ -59,10 +64,6 @@ to help you feel a little more comfortable, i've prepared some commands for you:
document.body.classList.add("lcd"); document.body.classList.add("lcd");
} }
content = document.getElementById("content");
server_indicator = document.getElementById("server-url");
mobile_input = document.getElementById("mobile-input");
document.addEventListener("keydown", handle_input); document.addEventListener("keydown", handle_input);
document.addEventListener("paste", handle_paste); document.addEventListener("paste", handle_paste);
@ -87,9 +88,7 @@ to help you feel a little more comfortable, i've prepared some commands for you:
} }
/** /**
* closes any existing websocket connection and attempts to create a new one. * closes any existing websocket connection and attempts to create a new one.
* `wss://` is prefixed automatically if not present.
* insecure websockets are not recommended and support is not planned.
* @param {string} server_url - the server websocket url to connect to. * @param {string} server_url - the server websocket url to connect to.
*/ */
export async function connect(server_url) { export async function connect(server_url) {
@ -111,106 +110,91 @@ export async function connect(server_url) {
add_system_message("Connecting to the server...\n"); add_system_message("Connecting to the server...\n");
let protocol = false; if (server_url.startsWith("wss://") || server_url.startsWith("ws://")) {
client = new WebSocket(server_url);
// check if user explicitly stated secure/insecure protocol add_client_events(client);
if (server_url.startsWith("wss://")) { client.addEventListener('error', () => {
protocol = "wss://"; add_system_message(`\nConnection failed!\n`);
server_url = server_url.split(6); add_system_message("Ensure you entered the correct server URL, or check the console for more details.\n");
} else if (server_url.startsWith("ws://")) {
server_url = server_url.split(5);
protocol = "ws://";
}
// otherwise, probe the url!
else protocol = await get_available_socket_protocol(server_url);
// no server was found!
if (!protocol) {
return add_system_message(`\n[NO SERVER FOUND AT ${server_url}!]\n`);
}
// server was found, but it's insecure!
if (protocol === "ws://") {
const warn_dialog = document.getElementById("warn-dialog");
const warn_close = warn_dialog.getElementsByClassName("dialog-close").item(0);
const user_wants_insecure = await new Promise((Resolve, Reject) => {
const dialog_backdrop = document.getElementById("dialog-backdrop");
const warn_proceed = document.getElementById("warn-proceed");
const warn_cancel = document.getElementById("warn-cancel");
warn_dialog.classList.add("show");
dialog_backdrop.classList.add("show");
set_enable_input(false);
warn_close.addEventListener('click', () => {
Resolve(false);
});
warn_cancel.addEventListener('click', () => {
Resolve(false);
});
warn_proceed.addEventListener('click', () => {
Resolve(true);
});
}); });
} else {
warn_close.click(); try {
client = await find_socket_at_url(server_url);
set_enable_input(true); } catch (error) {
if (error === 'deny-insecure') {
if (!user_wants_insecure) { server_indicator.innerText = "not connected";
server_indicator.innerText = "not connected"; add_system_message(`\n[CONNECTION CLOSED]\n`);
add_system_message(`\n[CONNECTION CLOSED]\n`); return
return; }
add_system_message(`\nConnection failed!\n`);
add_system_message("Ensure you entered the correct server URL, or check the console for more details.\n");
} }
} }
client = new WebSocket(protocol + server_url); set_enable_input(true);
}
/**
* attaches initial client events (open, message, close)
* @param {WebSocket} client the client to bind events to.
*/
function add_client_events(client) {
client.addEventListener('open', async () => {
console.log(`Successfully connected to ${client.url}.`);
client.addEventListener('open', () => {
server_indicator.innerText = server_url; server_indicator.innerText = server_url;
add_system_message(`Connection successful.\n\n`); add_system_message(`Connection successful.\n\n`);
add_system_message(`=== BEGIN SESSION ===\n\n`); add_system_message(`=== BEGIN SESSION ===\n\n`);
client.send(JSON.stringify({
type: DATA_TYPES.version,
text: VERSION
}));
client.addEventListener('message', handle_message);
client.addEventListener('close', () => {
server_indicator.innerText = "not connected";
add_system_message(`\n[CONNECTION CLOSED]\n`);
});
new_caret(); new_caret();
}); });
client.addEventListener('message', handle_message);
client.addEventListener('close', () => {
server_indicator.innerText = "not connected";
add_system_message(`\n[CONNECTION CLOSED]\n`);
});
client.addEventListener('error', () => {
add_system_message(`\nConnection failed!\n`);
add_system_message("Ensure you entered the correct server URL, or check the console for more details.\n");
});
} }
/** /**
* probes the `server_url` for a secure websocket connection first, an insecure websocket second, or resolves to `false` on failure. * probes the `server_url` for a secure websocket connection first, an insecure websocket second, or resolves to `false` on failure.
* @param {string} server_url * @param {string} server_url
* @returns a promise either resolving to the discovered protocol, or false on failure. * @returns a promise either resolving to the created socket, or rejects to a string on failure.
*/ */
function get_available_socket_protocol(server_url) { function find_socket_at_url(server_url) {
return new Promise((Resolve, Reject) => { return new Promise((Resolve, Reject) => {
const secure_client = new WebSocket("wss://" + server_url); const secure_client = new WebSocket("wss://" + server_url);
add_client_events(secure_client);
secure_client.addEventListener('open', () => { secure_client.addEventListener('open', () => {
Resolve("wss://"); Resolve(secure_client);
}); });
secure_client.addEventListener('error', () => { secure_client.addEventListener('error', async () => {
set_enable_input(false);
if (!await user_confirm_insecure()) {
Reject('deny-insecure');
set_enable_input(true);
return;
}
set_enable_input(true);
const insecure_client = new WebSocket("ws://" + server_url); const insecure_client = new WebSocket("ws://" + server_url);
add_client_events(insecure_client);
insecure_client.addEventListener('open', () => { insecure_client.addEventListener('open', () => {
Resolve("ws://"); Resolve(insecure_client);
}); });
insecure_client.addEventListener('error', () => { insecure_client.addEventListener('error', () => {
Reject(false); Reject('error');
}); });
}); });
}); });
} }
@ -229,7 +213,7 @@ function add_system_message(text) {
} }
/** /**
* the message handler for the websocket. * handles incoming messages on the websocket.
*/ */
function handle_message(event) { function handle_message(event) {
var data; var data;

89
server/main.js
View file

@ -3,6 +3,8 @@ const http = require('http');
const path = require('path'); const path = require('path');
const Websocket = require('ws'); const Websocket = require('ws');
const VERSION = "1.1.0";
const MIME_TYPES = { const MIME_TYPES = {
default: "application/octet-stream", default: "application/octet-stream",
html: "text/html; charset=UTF-8", html: "text/html; charset=UTF-8",
@ -23,6 +25,7 @@ const DATA_TYPES = {
backspace: 4, backspace: 4,
backword: 5, backword: 5,
arrow: 6, arrow: 6,
version: 7,
}; };
const MOTDS = [ const MOTDS = [
@ -43,7 +46,7 @@ const MOTDS = [
]; ];
const STATIC_PATH = path.join(process.cwd(), "public"); const STATIC_PATH = path.join(process.cwd(), "public");
const CACHE_MAX_AGE = 86400 // 1 day const CACHE_MAX_AGE = 14400 // 4 hours
const BANNER = const BANNER =
`Welcome to OpenTerminal! `Welcome to OpenTerminal!
@ -58,9 +61,15 @@ Please acquire a genuine copy.
This connection will now terminate. This connection will now terminate.
========================================= =========================================
`; `;
const VERSION_ERROR =
`Your client does not match this server's version of OpenTerminal (${VERSION})!
If you are connecting to this site's own OpenTerminal server, please refresh the page or clear your browser's cache to update.
`
console.log("using env vars: " + Object.keys(process.env).filter(value => { return value.startsWith("OPENTERM_") }).join(', '));
const PORT = process.env.PORT || 8080; const HOST = process.env.OPENTERM_HOST || '0.0.0.0';
const PORT = process.env.OPENTERM_PORT || 8080;
const TRUSTED_PROXIES = process.env.OPENTERM_TRUSTED_PROXIES ? process.env.OPENTERM_TRUSTED_PROXIES.split(',') : [];
const PING_INTERVAL = 10000; const PING_INTERVAL = 10000;
let sockets = []; let sockets = [];
@ -81,20 +90,28 @@ async function get_file(url) {
// check for path traversal. path traversal is...bad. // check for path traversal. path traversal is...bad.
const path_traversal = !file_path.startsWith(STATIC_PATH); const path_traversal = !file_path.startsWith(STATIC_PATH);
const exists = await fs.promises.access(file_path).then(...[() => true, () => false]); const exists = fs.existsSync(file_path) && fs.statSync(file_path).isFile();
if (path_traversal || !exists) return false; if (path_traversal || !exists) return false;
const ext = path.extname(file_path).substring(1).toLowerCase(); const ext = path.extname(file_path).substring(1).toLowerCase();
const stream = fs.createReadStream(file_path);
return { stream, ext }; try {
const data = await fs.promises.readFile(file_path, { encoding: 'utf8' });
return { data, ext };
} catch (error) {
console.error(error);
return false;
}
} }
const server = http.createServer(async (req, res) => { const server = http.createServer(async (req, res) => {
const request_time = new Date().getTime();
const file = await get_file(req.url); const file = await get_file(req.url);
if (!file) { if (file === false) {
res.writeHead(404); res.writeHead(404);
res.end(); res.end("404 not found!");
return; return log_request(req, res, request_time);
} }
const mime_type = MIME_TYPES[file.ext] || MIME_TYPES.default; const mime_type = MIME_TYPES[file.ext] || MIME_TYPES.default;
res.writeHead(200, { res.writeHead(200, {
@ -102,12 +119,26 @@ const server = http.createServer(async (req, res) => {
"Cache-Control": `max-age=${CACHE_MAX_AGE}`, "Cache-Control": `max-age=${CACHE_MAX_AGE}`,
"Server": "OpenTerminal", "Server": "OpenTerminal",
}); });
file.stream.pipe(res); res.write(file.data);
// console.log(`${req.method} - ${req.url}`); res.end();
return log_request(req, res, request_time);
}); });
function log_request(req, res, time) {
const elapsed = new Date().getTime() - time;
console.log(`${new Date().toISOString()} - ${req.method} ${req.url} - ${res.statusCode} - ${get_real_address(req)} in ${elapsed}ms`);
}
function get_real_address(req) {
if (TRUSTED_PROXIES.indexOf(req.socket.localAddress) !== -1 && req.headers['x-forwarded-for']) {
return req.headers['x-forwarded-for'];
}
return req.socket.localAddress;
}
const wss = new Websocket.Server({ server }); const wss = new Websocket.Server({ server });
wss.on('connection', socket => { wss.on('connection', (socket, req) => {
console.log(`${new Date().toISOString()} - WS OPEN - ${get_real_address(req)} (active connections: ${sockets.length + 1})`);
/* /*
socket.colour = generate_colour(); socket.colour = generate_colour();
socket.send(JSON.stringify({ socket.send(JSON.stringify({
@ -128,18 +159,16 @@ wss.on('connection', socket => {
})); }));
} }
const ping_interval = setInterval( const ping_routine = setInterval(
function() { function() {
socket.send(JSON.stringify({ socket.send(JSON.stringify({
type: DATA_TYPES.ping, type: DATA_TYPES.ping,
})) }))
}, PING_INTERVAL); }, PING_INTERVAL);
socket.ping_interval = ping_interval; socket.ping_routine = ping_routine;
sockets.push(socket); sockets.push(socket);
// console.log(`new connection.\n\tcurrent connections: ${sockets.length}`);
socket.on('message', event => { socket.on('message', event => {
try { try {
handle_message(JSON.parse(event), socket) handle_message(JSON.parse(event), socket)
@ -153,7 +182,7 @@ wss.on('connection', socket => {
}); });
socket.on('close', () => { socket.on('close', () => {
clearInterval(socket.ping_interval); clearInterval(socket.ping_routine);
sockets = sockets.filter(s => s !== socket); sockets = sockets.filter(s => s !== socket);
// console.log(`connection closed.\n\tcurrent connections: ${sockets.length}`); // console.log(`connection closed.\n\tcurrent connections: ${sockets.length}`);
}); });
@ -163,6 +192,27 @@ wss.on('connection', socket => {
* handles parsed JSON data sent by the client. * handles parsed JSON data sent by the client.
*/ */
function handle_message(data, user) { function handle_message(data, user) {
if (user.version === undefined) {
if (data.type !== DATA_TYPES.version) {
user.send(JSON.stringify({
type: DATA_TYPES.text,
text: VERSION_ERROR
}));
user.close();
return;
} else if (data.text !== VERSION) {
user.send(JSON.stringify({
type: DATA_TYPES.text,
text: VERSION_ERROR
}));
user.close();
return;
} else {
user.version = data.text;
return;
}
}
switch (data.type) { switch (data.type) {
case DATA_TYPES.backword: case DATA_TYPES.backword:
var break_point = buffer.lastIndexOf(" "); var break_point = buffer.lastIndexOf(" ");
@ -220,8 +270,9 @@ function generate_colour() {
return result; return result;
} }
server.listen(PORT, () => { server.listen(PORT, HOST, () => {
console.log(`OpenTerminal is now LIVE on http://127.0.0.1:${PORT}`); console.log(`OpenTerminal is now LIVE on http://${HOST === '0.0.0.0' ? '127.0.0.1' : HOST}:${PORT}`);
if (TRUSTED_PROXIES.length > 0) console.log(`Using X-Forwarded-For headers for hosts: ${TRUSTED_PROXIES.join(", ")}`);
}); });
/** /**