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node_modules/
certs/
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README.md
nodemon.json
*.service

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**/.DS_Store
node_modules/
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docker-compose*.yml
!docker-compose-example.yml

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FROM --platform=linux/amd64 node:20-alpine3.18
# set working directory
WORKDIR /srv/openterminal
# install dependencies
COPY package*.json ./
RUN npm ci --omit=dev
COPY . .
EXPOSE 8080
CMD [ "node", "./server/main.js" ]

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GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
Also add information on how to contact you by electronic and paper mail.
If the program does terminal interaction, make it output a short
notice like this when it starts in an interactive mode:
<program> Copyright (C) <year> <name of author>
This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License. Of course, your program's commands
might be different; for a GUI interface, you would use an "about box".
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, see
<https://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
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 Normal file
View file

@ -0,0 +1,15 @@
[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

20
README.md
View file

@ -1,5 +1,4 @@
# OpenTerminal
An online terminal and communal text buffer
![openterminal thumbnail image](public/img/thumbnail.png)
@ -16,25 +15,14 @@ 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.
## 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
- rewrite backend in go/rust (me no like javascript raaaahhh)
- master server (anyone can host a channel and post to the MS)
- colour palette switcher in the UI (rather than in console)
- multiple "channels" (at least if one gets flooded, there's somewhere else you can go)
### "maybe" roadmap
- master server (anyone can host a channel and post to the MS)
- channel logs (for recovery in the event of a crash, as an optional feature)

13
docker-compose-example.yml
View file

@ -1,13 +0,0 @@
version: "3.9"
services:
web:
build: .
image: openterminal
container_name: openterminal
ports:
- 8080:8080
environment:
OPENTERM_HOST: 0.0.0.0
OPENTERM_PORT: 8080
# OPENTERM_TRUSTED_PROXIES: 127.0.0.1,192.168.0.100
restart: unless-stopped

18
public/index.html
View file

@ -49,26 +49,8 @@
<ul>
<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 id="version">loading...</li>
</ul>
</footer>
<div id="dialog-backdrop"></div>
<div id="connect-dialog" class="dialog">
<button class="dialog-close">X</button>
<p>Enter the address of the server you would like to connect to:</p>
<input id="connect-url" name="server" type="text" spellcheck="false">
<button id="connect-submit">Connect</button>
</div>
<div id="warn-dialog" class="dialog">
<button class="dialog-close">X</button>
<p>
WARNING: The server you're about to connect to is insecure.
Your activity here may be available to anyone monitoring your network traffic!
Are you sure you want to continue?
</p>
<button id="warn-proceed">Okay!</button>
<button id="warn-cancel">Nevermind!</button>
</div>
<div id="overlay"></div>
</body>
</html>

86
public/scripts/main.js
View file

@ -2,93 +2,13 @@ import * as Terminal from "./terminal.js";
import * as Visual from "./visual.js";
document.addEventListener("DOMContentLoaded", () => {
document.getElementById("version").textContent = Terminal.VERSION;
Visual.bind();
Terminal.start();
const dialog_backdrop = document.getElementById("dialog-backdrop");
const connect_button = document.getElementById("connect");
const connect_dialog = document.getElementById("connect-dialog");
const connect_url = document.getElementById("connect-url");
const connect_submit = document.getElementById("connect-submit");
const connect_close = connect_dialog.getElementsByClassName("dialog-close").item(0);
connect_url.placeholder = window.location.host;
connect_button.addEventListener("click", () => {
connect_url.value = "";
connect_dialog.classList.add("show");
dialog_backdrop.classList.add("show");
connect_url.focus();
Terminal.set_enable_input(false);
});
connect_submit.addEventListener("click", () => {
connect_close.click();
const new_server = connect_url.value || window.location.host;
document.getElementById("connect").addEventListener("click", () => {
var new_server = prompt("Enter the address of the server you would like to connect to:");
if (!new_server) return;
Terminal.connect(new_server);
});
connect_dialog.addEventListener("keydown", event => {
switch (event.key) {
case "Enter":
connect_submit.click();
break;
case "Escape":
connect_close.click();
break;
}
return;
});
[...document.getElementsByClassName("dialog-close")].forEach(dialog_close => {
dialog_close.addEventListener("click", () => {
[...document.getElementsByClassName("dialog")].forEach(element => {
element.classList.remove("show");
});
dialog_backdrop.classList.remove("show");
Terminal.set_enable_input(true);
});
});
dialog_backdrop.addEventListener("click", () => {
connect_close.click();
});
});
/**
* 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;
}

133
public/scripts/terminal.js
View file

@ -1,22 +1,15 @@
import { user_confirm_insecure } from "./main.js";
export const VERSION = "1.1.0";
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 recv_buffer = [];
var send_buffer = [];
var content;
var server_indicator;
var mobile_input;
var client;
var my_colour = false;
var pre_buffer_chars = 0;
var server_url = "";
var enable_input = true;
const DATA_TYPES = {
ping: 0,
@ -26,7 +19,6 @@ const DATA_TYPES = {
backspace: 4,
backword: 5,
arrow: 6,
version: 7,
};
/**
@ -56,6 +48,8 @@ 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;
const foreground = localStorage.getItem("foreground");
const background = localStorage.getItem("background");
if (foreground && background) {
window.set_colours(foreground, background);
}
@ -64,6 +58,10 @@ to help you feel a little more comfortable, i've prepared some commands for you:
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("paste", handle_paste);
@ -88,7 +86,9 @@ 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.
*/
export async function connect(server_url) {
@ -110,92 +110,26 @@ export async function connect(server_url) {
add_system_message("Connecting to the server...\n");
if (server_url.startsWith("wss://") || server_url.startsWith("ws://")) {
client = new WebSocket(server_url);
add_client_events(client);
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");
});
} else {
try {
client = await find_socket_at_url(server_url);
} catch (error) {
if (error === 'deny-insecure') {
server_indicator.innerText = "not connected";
add_system_message(`\n[CONNECTION CLOSED]\n`);
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");
}
}
if (!server_url.startsWith("wss://")) server_url = "wss://" + server_url;
client = new WebSocket(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}.`);
server_indicator.innerText = server_url;
client.addEventListener('open', () => {
server_indicator.innerText = server_url.slice(6);
add_system_message(`Connection successful.\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();
});
}
/**
* probes the `server_url` for a secure websocket connection first, an insecure websocket second, or resolves to `false` on failure.
* @param {string} server_url
* @returns a promise either resolving to the created socket, or rejects to a string on failure.
*/
function find_socket_at_url(server_url) {
return new Promise((Resolve, Reject) => {
const secure_client = new WebSocket("wss://" + server_url);
add_client_events(secure_client);
client.addEventListener('message', handle_message);
secure_client.addEventListener('open', () => {
Resolve(secure_client);
});
client.addEventListener('close', () => {
server_indicator.innerText = "not connected";
add_system_message(`\n[CONNECTION CLOSED]\n`);
});
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);
add_client_events(insecure_client);
insecure_client.addEventListener('open', () => {
Resolve(insecure_client);
});
insecure_client.addEventListener('error', () => {
Reject('error');
});
});
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");
});
}
@ -213,7 +147,7 @@ function add_system_message(text) {
}
/**
* handles incoming messages on the websocket.
* the message handler for the websocket.
*/
function handle_message(event) {
var data;
@ -289,22 +223,11 @@ function new_caret() {
content.appendChild(new_caret);
}
/**
* sets whether or not the terminal should accept user input
* (handy for not interfering with dialogs)
* @param {value} boolean
*/
export function set_enable_input(value) {
enable_input = value;
}
/**
* the input handler for the document.
* automatically scrolls to the bottom of the page on valid key presses.
*/
function handle_input(event) {
if (!enable_input) return;
if (event.key == "'") {
event.preventDefault();
}

83
public/styles/main.css
View file

@ -1,7 +1,6 @@
:root {
--colour: #a6e3a1;
--bgcolour: #1e1e2e;
--warn-colour: #e83737;
}
body {
@ -136,7 +135,6 @@ div#overlay {
pointer-events: none;
animation: linear .05s infinite alternate overlay-flicker;
mix-blend-mode: overlay;
z-index: 100;
}
body.lcd div#overlay {
@ -175,84 +173,3 @@ body.lcd pre#content {
pointer-events: none;
}
#dialog-backdrop {
position: fixed;
top: 0;
left: 0;
width: 100vw;
height: 100vh;
display: none;
background: black;
opacity: .25;
z-index: 99;
}
div.dialog {
position: fixed;
top: 50%;
left: 50%;
margin: auto auto;
padding: 1rem;
display: none;
transform: translate(-50%, -50%);
border: 1px solid var(--colour);
color: var(--colour);
background: var(--bgcolour);
text-shadow: 0 0 2em;
z-index: 99;
}
div.dialog p {
margin: 0 0 1em 0;
}
div.dialog input {
font-family: inherit;
color: inherit;
border: inherit;
background: transparent;
}
div.dialog input::placeholder {
font-family: inherit;
color: inherit;
opacity: .25;
}
div.dialog button {
font-family: inherit;
border: inherit;
color: inherit;
background: transparent;
cursor: pointer;
}
#dialog-backdrop.show,
div.dialog.show {
display: block;
}
div.dialog .dialog-close {
position: absolute;
top: -0.7em;
right: 1rem;
border: none;
background: var(--bgcolour);
}
#connect-dialog {
max-width: calc(100vw - 4rem);
width: 16rem;
}
#warn-dialog {
max-width: 18rem;
color: var(--warn-colour);
border-color: var(--warn-colour);
}
*:focus {
outline: none;
box-shadow: 0 0 4px;
}

98
server/main.js
View file

@ -1,9 +1,12 @@
const fs = require('fs');
const http = require('http');
const https = require('https');
const path = require('path');
const Websocket = require('ws');
const VERSION = "1.1.0";
const config = {
cert: fs.readFileSync(process.env.SSL_CERT || './certs/cert.crt'),
key: fs.readFileSync(process.env.SSL_KEY || './certs/cert.key'),
}
const MIME_TYPES = {
default: "application/octet-stream",
@ -25,7 +28,6 @@ const DATA_TYPES = {
backspace: 4,
backword: 5,
arrow: 6,
version: 7,
};
const MOTDS = [
@ -46,7 +48,7 @@ const MOTDS = [
];
const STATIC_PATH = path.join(process.cwd(), "public");
const CACHE_MAX_AGE = 14400 // 4 hours
const CACHE_MAX_AGE = 86400 // 1 day
const BANNER =
`Welcome to OpenTerminal!
@ -61,15 +63,9 @@ Please acquire a genuine copy.
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 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 PORT = process.env.PORT || 8080;
const PING_INTERVAL = 10000;
let sockets = [];
@ -78,7 +74,7 @@ const MAX_BUFFER_SIZE = 1024 * 1000;
const MAX_MESSAGE_LENGTH = 1024;
/**
* simple file fetching for the HTTP server
* simple file fetching for the HTTPS server
*/
async function get_file(url) {
// ignore query params...not very helpful when getting files!
@ -90,28 +86,20 @@ async function get_file(url) {
// check for path traversal. path traversal is...bad.
const path_traversal = !file_path.startsWith(STATIC_PATH);
const exists = fs.existsSync(file_path) && fs.statSync(file_path).isFile();
const exists = await fs.promises.access(file_path).then(...[() => true, () => false]);
if (path_traversal || !exists) return false;
const ext = path.extname(file_path).substring(1).toLowerCase();
try {
const data = await fs.promises.readFile(file_path, { encoding: 'utf8' });
return { data, ext };
} catch (error) {
console.error(error);
return false;
}
const stream = fs.createReadStream(file_path);
return { stream, ext };
}
const server = http.createServer(async (req, res) => {
const request_time = new Date().getTime();
const server = https.createServer(config, async (req, res) => {
const file = await get_file(req.url);
if (file === false) {
if (!file) {
res.writeHead(404);
res.end("404 not found!");
return log_request(req, res, request_time);
res.end();
return;
}
const mime_type = MIME_TYPES[file.ext] || MIME_TYPES.default;
res.writeHead(200, {
@ -119,26 +107,12 @@ const server = http.createServer(async (req, res) => {
"Cache-Control": `max-age=${CACHE_MAX_AGE}`,
"Server": "OpenTerminal",
});
res.write(file.data);
res.end();
return log_request(req, res, request_time);
file.stream.pipe(res);
// console.log(`${req.method} - ${req.url}`);
});
function log_request(req, res, time) {
const elapsed = new Date().getTime() - time;
console.log(`${new Date().toISOString()} - ${req.method} ${req.url} - ${res.statusCode} - ${get_real_address(req)} in ${elapsed}ms`);
}
function get_real_address(req) {
if (TRUSTED_PROXIES.indexOf(req.socket.localAddress) !== -1 && req.headers['x-forwarded-for']) {
return req.headers['x-forwarded-for'];
}
return req.socket.localAddress;
}
const wss = new Websocket.Server({ server });
wss.on('connection', (socket, req) => {
console.log(`${new Date().toISOString()} - WS OPEN - ${get_real_address(req)} (active connections: ${sockets.length + 1})`);
wss.on('connection', socket => {
/*
socket.colour = generate_colour();
socket.send(JSON.stringify({
@ -159,16 +133,18 @@ wss.on('connection', (socket, req) => {
}));
}
const ping_routine = setInterval(
const ping_interval = setInterval(
function() {
socket.send(JSON.stringify({
type: DATA_TYPES.ping,
}))
}, PING_INTERVAL);
socket.ping_routine = ping_routine;
socket.ping_interval = ping_interval;
sockets.push(socket);
// console.log(`new connection.\n\tcurrent connections: ${sockets.length}`);
socket.on('message', event => {
try {
handle_message(JSON.parse(event), socket)
@ -182,7 +158,7 @@ wss.on('connection', (socket, req) => {
});
socket.on('close', () => {
clearInterval(socket.ping_routine);
clearInterval(socket.ping_interval);
sockets = sockets.filter(s => s !== socket);
// console.log(`connection closed.\n\tcurrent connections: ${sockets.length}`);
});
@ -192,27 +168,6 @@ wss.on('connection', (socket, req) => {
* handles parsed JSON data sent by the client.
*/
function handle_message(data, user) {
if (user.version === undefined) {
if (data.type !== DATA_TYPES.version) {
user.send(JSON.stringify({
type: DATA_TYPES.text,
text: VERSION_ERROR
}));
user.close();
return;
} else if (data.text !== VERSION) {
user.send(JSON.stringify({
type: DATA_TYPES.text,
text: VERSION_ERROR
}));
user.close();
return;
} else {
user.version = data.text;
return;
}
}
switch (data.type) {
case DATA_TYPES.backword:
var break_point = buffer.lastIndexOf(" ");
@ -270,9 +225,8 @@ function generate_colour() {
return result;
}
server.listen(PORT, HOST, () => {
console.log(`OpenTerminal is now LIVE on http://${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: ${TRUSTED_PROXIES.join(", ")}`);
server.listen(PORT, () => {
console.log(`OpenTerminal is now LIVE on https://127.0.0.1:${PORT}!`);
});
/**