Last active
April 19, 2024 12:11
-
-
Save xprilion/ceab48ec77a70be1d403e396170991e6 to your computer and use it in GitHub Desktop.
Python Websockets SSL with Lets Encrypt
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| ## Python Websockets SSL with Lets Encrypt | |
| This code uses the `python-websockets` library. | |
| You'll need to generate the certificate and keyfile using Let's Encrypt. | |
| After generating the files correctly, you need to make them accessible to the current user who runs the script, my way of doing this was to copy it to the home directory of the current user and change the owner to the current user, set the permissions of the files to 400. | |
| To know more about this process, read the blog here - https://xprilion.com/python-websockets-ssl-with-lets-encrypt/ |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| <html> | |
| <head> | |
| <title>WebSocket demo</title> | |
| <style type="text/css"> | |
| body { | |
| font-family: "Courier New", sans-serif; | |
| text-align: center; | |
| } | |
| .buttons { | |
| font-size: 4em; | |
| display: flex; | |
| justify-content: center; | |
| } | |
| .button, .value { | |
| line-height: 1; | |
| padding: 2rem; | |
| margin: 2rem; | |
| border: medium solid; | |
| min-height: 1em; | |
| min-width: 1em; | |
| } | |
| .button { | |
| cursor: pointer; | |
| user-select: none; | |
| } | |
| .minus { | |
| color: red; | |
| } | |
| .plus { | |
| color: green; | |
| } | |
| .value { | |
| min-width: 2em; | |
| } | |
| .state { | |
| font-size: 2em; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <div class="buttons"> | |
| <div class="minus button">-</div> | |
| <div class="value">?</div> | |
| <div class="plus button">+</div> | |
| </div> | |
| <div class="state"> | |
| <span class="users">?</span> online | |
| </div> | |
| <script> | |
| var minus = document.querySelector('.minus'), | |
| plus = document.querySelector('.plus'), | |
| value = document.querySelector('.value'), | |
| users = document.querySelector('.users'), | |
| websocket = new WebSocket("wss://localhost:6789/"); | |
| minus.onclick = function (event) { | |
| websocket.send(JSON.stringify({action: 'minus'})); | |
| } | |
| plus.onclick = function (event) { | |
| websocket.send(JSON.stringify({action: 'plus'})); | |
| } | |
| websocket.onmessage = function (event) { | |
| data = JSON.parse(event.data); | |
| switch (data.type) { | |
| case 'state': | |
| value.textContent = data.value; | |
| break; | |
| case 'users': | |
| users.textContent = ( | |
| data.count.toString() + " user" + | |
| (data.count == 1 ? "" : "s")); | |
| break; | |
| default: | |
| console.error( | |
| "unsupported event", data); | |
| } | |
| }; | |
| </script> | |
| </body> | |
| </html |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| #!/usr/bin/env python | |
| # WS server example that synchronizes state across clients | |
| import asyncio | |
| import json | |
| import logging | |
| import websockets | |
| import ssl | |
| logging.basicConfig() | |
| ssl_context = ssl.SSLContext(ssl.PROTOCOL_TLS_SERVER) | |
| # Generate with Lets Encrypt, copied to this location, chown to current user and 400 permissions | |
| ssl_cert = "/home/username/fullchain.pem" | |
| ssl_key = "/home/username/privkey.pem" | |
| ssl_context.load_cert_chain(ssl_cert, keyfile=ssl_key) | |
| STATE = {"value": 0} | |
| USERS = set() | |
| def state_event(): | |
| return json.dumps({"type": "state", **STATE}) | |
| def users_event(): | |
| return json.dumps({"type": "users", "count": len(USERS)}) | |
| async def notify_state(): | |
| if USERS: # asyncio.wait doesn't accept an empty list | |
| message = state_event() | |
| await asyncio.wait([user.send(message) for user in USERS]) | |
| async def notify_users(): | |
| if USERS: # asyncio.wait doesn't accept an empty list | |
| message = users_event() | |
| await asyncio.wait([user.send(message) for user in USERS]) | |
| async def register(websocket): | |
| USERS.add(websocket) | |
| await notify_users() | |
| async def unregister(websocket): | |
| USERS.remove(websocket) | |
| await notify_users() | |
| async def counter(websocket, path): | |
| # register(websocket) sends user_event() to websocket | |
| await register(websocket) | |
| try: | |
| await websocket.send(state_event()) | |
| async for message in websocket: | |
| data = json.loads(message) | |
| if data["action"] == "minus": | |
| STATE["value"] -= 1 | |
| await notify_state() | |
| elif data["action"] == "plus": | |
| STATE["value"] += 1 | |
| await notify_state() | |
| else: | |
| logging.error("unsupported event: {}", data) | |
| finally: | |
| await unregister(websocket) | |
| start_server = websockets.serve(counter, "0.0.0.0", 6789, ssl=ssl_context) | |
| asyncio.get_event_loop().run_until_complete(start_server) | |
| asyncio.get_event_loop().run_forever() |
how about if python is the client?
I wonder if any special configuration is needed to use python as a client for a websocket, maybe you can generate one easily using any GPT tools? Do let me know if that doesn't work for you.
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Awesome example of a secure websocket!
Thank you so much @xprilion!