362 lines
13 KiB
Python
362 lines
13 KiB
Python
#!/usr/bin/env python
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import argparse
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import http
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import json
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import mimetypes
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import os
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import RNS
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import LXMF
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import asyncio
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import websockets
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import base64
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class ReticulumWebChat:
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def __init__(self, identity: RNS.Identity):
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# default values before loading config
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self.display_name = "Anonymous Peer"
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# load config
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self.config_file = "storage/config.json"
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self.load_config()
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# init reticulum
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self.reticulum = RNS.Reticulum(None)
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self.identity = identity
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# init lxmf router
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self.message_router = LXMF.LXMRouter(identity=self.identity, storagepath="storage/lxmf")
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# register lxmf identity
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self.local_lxmf_destination = self.message_router.register_delivery_identity(self.identity, display_name=self.display_name)
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# set a callback for when an lxmf message is received
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self.message_router.register_delivery_callback(self.on_lxmf_delivery)
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# set a callback for when an lxmf announce is received
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RNS.Transport.register_announce_handler(LXMFAnnounceHandler(self.on_lxmf_announce_received))
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# remember websocket clients
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self.websocket_clients = []
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def load_config(self):
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# default config
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config = {
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}
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# attempt to load config and override default values
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try:
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with open(self.config_file, 'r') as f:
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custom_config = json.load(f)
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config |= custom_config
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# config is broken, fallback to defaults
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except:
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print("failed to load config, defaults will be used")
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# update display name from config
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if "display_name" in config:
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self.display_name = config["display_name"]
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# return loaded config
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return config
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def save_config(self):
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# build config
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config = {
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"display_name": self.display_name,
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}
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# attempt to save config
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try:
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with open(self.config_file, 'w') as f:
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json.dump(config, f, indent=4)
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# config is broken, fallback to defaults
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except:
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print("failed to save config")
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async def run(self, host, port):
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# start websocket server
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async with websockets.serve(self.on_websocket_client_connected, host, port, process_request=self.process_request):
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print("ReticulumWebChat server running at http://{}:{}".format(host, port))
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await asyncio.Future() # run forever
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# handle serving custom http paths
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async def process_request(self, path, request_headers):
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# serve index.html
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if path == "/":
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with open("index.html") as f:
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file_content = f.read()
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return http.HTTPStatus.OK, [
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('Content-Type', 'text/html')
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], file_content.encode("utf-8")
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# serve anything in public folder
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public_file_path = os.path.join("public", path.lstrip("/"))
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if os.path.isfile(public_file_path):
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mime_type, _ = mimetypes.guess_type(public_file_path)
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with open(public_file_path, "rb") as f:
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file_content = f.read()
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return http.HTTPStatus.OK, [
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('Content-Type', mime_type)
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], file_content
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# by default, websocket is always served, but we only want it to be available at /ws
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# so we will return 404 for everything other than /ws
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if path != "/ws":
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return http.HTTPStatus.NOT_FOUND, [
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('Content-Type', 'text/html')
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], b"Not Found"
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# handle new client connecting to websocket
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async def on_websocket_client_connected(self, client):
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# add client to connected clients list
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self.websocket_clients.append(client)
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# send config to all clients
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self.send_config_to_websocket_clients()
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# handle client messages until disconnected
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while True:
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try:
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message = await client.recv()
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data = json.loads(message)
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await self.on_websocket_data_received(client, data)
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except websockets.ConnectionClosedOK:
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# client disconnected, we can stop looping
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break
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except Exception as e:
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# ignore errors while handling message
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print("failed to process client message")
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print(e)
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# loop finished, client is no longer connected
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self.websocket_clients.remove(client)
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# handle data received from websocket client
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async def on_websocket_data_received(self, client, data):
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# get type from client data
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_type = data["type"]
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# handle updating config
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if _type == "config.set":
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# send lxmf message to destination
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config = data["config"]
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# update display name in state
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if "display_name" in config and config["display_name"] != "":
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self.display_name = config["display_name"]
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print("updated display name to: " + self.display_name)
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# save config
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self.save_config()
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# send config to websocket clients
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self.send_config_to_websocket_clients()
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# handle sending an lxmf message
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elif _type == "lxmf.delivery":
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# send lxmf message to destination
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destination_hash = data["destination_hash"]
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message = data["message"]
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self.send_message(destination_hash, message)
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# # TODO: send response to client when marked as delivered?
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# await client.send(json.dumps({
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# "type": "lxmf.sent",
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# }))
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# handle sending an announce
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elif _type == "announce":
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# send announce for lxmf
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self.local_lxmf_destination.announce()
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# unhandled type
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else:
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print("unhandled client message type: " + _type)
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# broadcast provided data to all connected websocket clients
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def websocket_broadcast(self, data):
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for websocket_client in self.websocket_clients:
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asyncio.create_task(websocket_client.send(data))
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# broadcasts config to all websocket clients
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def send_config_to_websocket_clients(self):
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self.websocket_broadcast(json.dumps({
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"type": "config",
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"config": {
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"display_name": self.display_name,
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"identity_hash": self.identity.hexhash,
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"lxmf_address_hash": self.local_lxmf_destination.hexhash,
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},
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}))
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# handle an lxmf delivery from reticulum
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def on_lxmf_delivery(self, message):
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try:
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# get message data
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message_content = message.content.decode('utf-8')
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source_hash_text = RNS.hexrep(message.source_hash, delimit=False)
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fields = {}
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message_fields = message.get_fields()
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for field_type in message_fields:
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value = message_fields[field_type]
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# handle file attachments field
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if field_type == LXMF.FIELD_FILE_ATTACHMENTS:
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# process file attachments
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file_attachments = []
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for file_attachment in value:
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file_name = file_attachment[0]
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file_bytes = base64.b64encode(file_attachment[1]).decode("utf-8")
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file_attachments.append({
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"file_name": file_name,
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"file_bytes": file_bytes,
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})
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# add to fields
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fields["file_attachments"] = file_attachments
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# handle image field
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if field_type == LXMF.FIELD_IMAGE:
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image_type = value[0]
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image_bytes = base64.b64encode(value[1]).decode("utf-8")
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fields["image"] = {
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"image_type": image_type,
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"image_bytes": image_bytes,
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}
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# send received lxmf message data to all websocket clients
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self.websocket_broadcast(json.dumps({
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"type": "lxmf.delivery",
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"source_hash": source_hash_text,
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"message": {
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"content": message_content,
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"fields": fields,
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},
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}))
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except Exception as e:
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# do nothing on error
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print("lxmf_delivery error: {}".format(e))
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# handle sending an lxmf message to reticulum
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def send_message(self, destination_hash, message_content):
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try:
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# convert destination hash to bytes
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destination_hash = bytes.fromhex(destination_hash)
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# find destination identity from hash
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destination_identity = RNS.Identity.recall(destination_hash)
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if destination_identity is None:
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# we don't know the path/identity for this destination hash, we will request it
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RNS.Transport.request_path(destination_hash)
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# we have to bail out of sending, since we don't have the path yet
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return
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# create destination for recipients lxmf delivery address
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lxmf_destination = RNS.Destination(destination_identity, RNS.Destination.OUT, RNS.Destination.SINGLE, "lxmf", "delivery")
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# create lxmf message
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lxm = LXMF.LXMessage(lxmf_destination, self.local_lxmf_destination, message_content, desired_method=LXMF.LXMessage.DIRECT)
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lxm.try_propagation_on_fail = True
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# send lxmf message to be routed to destination
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self.message_router.handle_outbound(lxm)
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except:
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# FIXME send error to websocket?
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print("failed to send lxmf message")
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# handle an announce received from reticulum, for an lxmf address
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def on_lxmf_announce_received(self, destination_hash, announced_identity, app_data):
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# log received announce
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RNS.log("Received an announce from " + RNS.prettyhexrep(destination_hash))
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# parse app data
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parsed_app_data = None
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if app_data is not None:
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parsed_app_data = app_data.decode("utf-8")
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# send received lxmf announce to all websocket clients
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self.websocket_broadcast(json.dumps({
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"type": "announce",
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"destination_hash": destination_hash.hex(),
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"app_data": parsed_app_data,
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}))
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# an announce handler for lxmf.delivery aspect that just forwards to a provided callback
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class LXMFAnnounceHandler:
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def __init__(self, received_announce_callback):
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self.aspect_filter = "lxmf.delivery"
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self.received_announce_callback = received_announce_callback
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# we will just pass the received announce back to the provided callback
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def received_announce(self, destination_hash, announced_identity, app_data):
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try:
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# handle received announce
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self.received_announce_callback(destination_hash, announced_identity, app_data)
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except:
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# ignore failure to handle received announce
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pass
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async def main():
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# parse command line args
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parser = argparse.ArgumentParser(description="ReticulumWebChat")
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parser.add_argument("--host", nargs='?', default="0.0.0.0", type=str, help="The address the web server should listen on.")
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parser.add_argument("--port", nargs='?', default="8000", type=int, help="The port the web server should listen on.")
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parser.add_argument("--identity-file", type=str, help="Path to a Reticulum Identity file to use as your LXMF address.")
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parser.add_argument("--identity-base64", type=str, help="A base64 encoded Reticulum Identity to use as your LXMF address.")
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args = parser.parse_args()
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# use provided identity, or fallback to a random one
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if args.identity_file is not None:
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identity = RNS.Identity(create_keys=False)
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identity.load(args.identity_file)
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print("Reticulum Identity has been loaded from file.")
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print(identity)
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elif args.identity_base64 is not None:
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identity = RNS.Identity(create_keys=False)
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identity.load_private_key(base64.b64decode(args.identity_base64))
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print("Reticulum Identity has been loaded from base64.")
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print(identity)
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else:
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identity = RNS.Identity(create_keys=True)
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print("Reticulum Identity has been randomly generated.")
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print(identity)
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# init app
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reticulum_webchat = ReticulumWebChat(identity)
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await reticulum_webchat.run(args.host, args.port)
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if __name__ == "__main__":
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asyncio.run(main())
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