273 lines
8.4 KiB
Python
273 lines
8.4 KiB
Python
#!/usr/bin/env python
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import argparse
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import json
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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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from sanic import Sanic, Request, Websocket, file
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# global references
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app_name = "ReticulumWebChat"
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reticulum: RNS.Reticulum | None = None
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identity: RNS.Identity | None = None
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message_router: LXMF.LXMRouter | None = None
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local_lxmf_destination: RNS.Destination | None = None
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websocket_clients = []
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# create sanic app
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app = Sanic(app_name)
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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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global identity
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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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# run sanic app
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app.run(
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host=args.host,
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port=args.port,
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)
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def start_reticulum():
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# init reticulum
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global reticulum
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reticulum = RNS.Reticulum(None)
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# init lxmf router
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global message_router
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message_router = LXMF.LXMRouter(identity=identity, storagepath="storage/lxmf")
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# register lxmf identity
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global local_lxmf_destination
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local_lxmf_destination = message_router.register_delivery_identity(identity, display_name="ReticulumWebChat")
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# set a callback for when an lxmf message is received
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message_router.register_delivery_callback(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(on_lxmf_announce_received))
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@app.after_server_start
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async def after_server_start(*_):
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start_reticulum()
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@app.get("/")
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async def hello_world(request):
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return await file("index.html")
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# handle websocket messages
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@app.websocket("/ws")
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async def on_websocket_client_connected(request: Request, client: Websocket):
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# add client to connected clients list
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websocket_clients.append(client)
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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 on_data(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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websocket_clients.remove(client)
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async def on_data(client, data):
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# get type from client data
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_type = data["type"]
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# handle sending an lxmf message
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if _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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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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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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def websocket_broadcast(data):
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# broadcast provided data to all connected websocket clients
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for websocket_client in websocket_clients:
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asyncio.run(websocket_client.send(data))
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def lxmf_delivery(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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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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def send_message(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, 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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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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def on_lxmf_announce_received(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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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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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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if __name__ == "__main__":
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main()
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