Merge pull request #6 from tomvanderlee/feature/websocketsv2.1.0main

Added websocket support

1 files changed, 179 insertions, 0 deletions

diff --git a/ttun_server/websockets.py b/ttun_server/websockets.py
new file mode 100644
index 0000000..0800cbc
--- /dev/null
+++ b/ttun_server/websockets.py
@@ -0,0 +1,179 @@
+import asyncio
+import json
+import logging
+import os
+import typing
+from asyncio import create_task
+from base64 import b64encode, b64decode
+from contextlib import asynccontextmanager
+from typing import Optional
+from uuid import uuid4
+
+from starlette.endpoints import WebSocketEndpoint
+from starlette.types import Scope, Receive, Send
+from starlette.websockets import WebSocket
+
+import ttun_server
+from ttun_server.proxy_queue import ProxyQueue
+from ttun_server.types import Config, Message, WebsocketMessageType, \
+    WebsocketConnectData, WebsocketMessage, WebsocketMessageData, WebsocketDisconnectData, MessageType
+
+logger = logging.getLogger(__name__)
+logger.setLevel('DEBUG')
+
+class WebsocketProxy(WebSocketEndpoint):
+    encoding = 'json'
+    websocket_listen_task = None
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.id = str(uuid4())
+
+    @asynccontextmanager
+    async def proxy(self, websocket: WebSocket, message: WebsocketMessage):
+        [subdomain, *_] = websocket.url.hostname.split('.')
+
+        expect_ack = WebsocketMessageType(message['type']) == WebsocketMessageType.connect
+
+        try:
+            request_queue = await ProxyQueue.get_for_identifier(subdomain)
+            await request_queue.enqueue(message)
+
+            if expect_ack:
+                response_queue = await ProxyQueue.create_for_identifier(f'{subdomain}_{message["identifier"]}')
+                yield await response_queue.dequeue()
+                await response_queue.delete()
+            else:
+                yield
+        except AssertionError:
+            pass
+
+    async def listen_for_messages(self, websocket: WebSocket):
+        [subdomain, *_] = websocket.url.hostname.split('.')
+
+        print('listen', self.id)
+        response_queue = await ProxyQueue.create_for_identifier(f'{subdomain}_{self.id}')
+
+        while True:
+            message: WebsocketMessage = await response_queue.dequeue()
+            logger.debug(message)
+            await websocket.send_text(b64decode(message['payload']['body'].encode()).decode())
+
+    async def on_connect(self, websocket: WebSocket) -> None:
+        message = WebsocketMessage(
+            type=WebsocketMessageType.connect.value,
+            identifier=self.id,
+            payload=WebsocketConnectData(
+                path=websocket.path_params['path'],
+                headers=[
+                    (k.decode(), v.decode())
+                    for k, v
+                    in websocket.scope['headers']
+                ],
+            )
+        )
+
+        async with self.proxy(websocket, message) as m:
+            type = WebsocketMessageType(m['type'])
+
+            if type == WebsocketMessageType.ack:
+                await super().on_connect(websocket)
+
+        self.websocket_listen_task = asyncio.create_task(self.listen_for_messages(websocket))
+
+        def callback(*args, **kwargs):
+            self.websocket_listen_task = None
+
+        self.websocket_listen_task.add_done_callback(callback)
+
+    async def on_receive(self, websocket: WebSocket, data: typing.Any) -> None:
+        match data:
+            case dict():
+                data_bytes = json.dumps(data).encode()
+            case bytes():
+                data_bytes = data
+            case _:
+                data_bytes = data.encode()
+
+        message = WebsocketMessage(
+            type=WebsocketMessageType.message.value,
+            identifier=self.id,
+            payload=WebsocketMessageData(
+                body=b64encode(data_bytes).decode(),
+            )
+        )
+
+        async with self.proxy(websocket, message):
+            pass
+
+    async def on_disconnect(self, websocket: WebSocket, close_code: int) -> None:
+        message = WebsocketMessage(
+            type=WebsocketMessageType.disconnect.value,
+            identifier=self.id,
+            payload=WebsocketDisconnectData(
+                close_code=close_code,
+            )
+        )
+
+        async with self.proxy(websocket, message):
+            if self.websocket_listen_task is not None:
+                self.websocket_listen_task.cancel()
+
+class Tunnel(WebSocketEndpoint):
+    encoding = 'json'
+
+    def __init__(self, scope: Scope, receive: Receive, send: Send):
+        super().__init__(scope, receive, send)
+        self.request_task = None
+        self.config: Optional[Config] = None
+
+    async def handle_requests(self, websocket: WebSocket):
+        while request := await self.proxy_queue.dequeue():
+            create_task(websocket.send_json(request))
+
+    async def on_connect(self, websocket: WebSocket) -> None:
+        await websocket.accept()
+        self.config = await websocket.receive_json()
+
+        client_version = self.config.get('version', '1.0.0')
+        logger.debug('client_version %s', client_version)
+
+        if 'git' not in client_version and ttun_server.__version__ != 'development':
+            [client_major, *_] = [int(i) for i in client_version.split('.')[:3]]
+            [server_major, *_] = [int(i) for i in ttun_server.__version__.split('.')]
+
+            if client_major < server_major:
+                await websocket.close(4000, 'Your client is too old')
+
+            if client_major > server_major:
+                await websocket.close(4001, 'Your client is too new')
+
+
+        if self.config['subdomain'] is None \
+                or await ProxyQueue.has_connection(self.config['subdomain']):
+            self.config['subdomain'] = uuid4().hex
+
+
+        self.proxy_queue = await ProxyQueue.create_for_identifier(self.config['subdomain'])
+
+        hostname = os.environ.get("TUNNEL_DOMAIN")
+        protocol = "https" if os.environ.get("SECURE", False) else "http"
+
+        await websocket.send_json({
+            'url': f'{protocol}://{self.config["subdomain"]}.{hostname}'
+        })
+
+        self.request_task = asyncio.create_task(self.handle_requests(websocket))
+
+    async def on_receive(self, websocket: WebSocket, data: Message):
+        try:
+            response_queue = await ProxyQueue.get_for_identifier(f"{self.config['subdomain']}_{data['identifier']}")
+            await response_queue.enqueue(data)
+        except AssertionError:
+            pass
+
+    async def on_disconnect(self, websocket: WebSocket, close_code: int):
+        await self.proxy_queue.delete()
+
+        if self.request_task is not None:
+            self.request_task.cancel()