2022-05-14 06:59:59 -05:00
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from typing import Union
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2020-06-28 20:13:30 +02:00
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2022-11-13 17:10:54 +01:00
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from fastapi import (
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Cookie,
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Depends,
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FastAPI,
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Query,
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WebSocket,
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WebSocketException,
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status,
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)
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2020-03-01 21:49:20 +01:00
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from fastapi.responses import HTMLResponse
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2019-05-24 09:41:41 -07:00
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app = FastAPI()
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html = """
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<!DOCTYPE html>
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<html>
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<head>
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<title>Chat</title>
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</head>
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<body>
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<h1>WebSocket Chat</h1>
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<form action="" onsubmit="sendMessage(event)">
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<label>Item ID: <input type="text" id="itemId" autocomplete="off" value="foo"/></label>
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<label>Token: <input type="text" id="token" autocomplete="off" value="some-key-token"/></label>
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<button onclick="connect(event)">Connect</button>
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<hr>
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<label>Message: <input type="text" id="messageText" autocomplete="off"/></label>
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<button>Send</button>
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</form>
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<ul id='messages'>
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</ul>
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<script>
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var ws = null;
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function connect(event) {
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var itemId = document.getElementById("itemId")
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var token = document.getElementById("token")
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ws = new WebSocket("ws://localhost:8000/items/" + itemId.value + "/ws?token=" + token.value);
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ws.onmessage = function(event) {
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var messages = document.getElementById('messages')
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var message = document.createElement('li')
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var content = document.createTextNode(event.data)
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message.appendChild(content)
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messages.appendChild(message)
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};
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event.preventDefault()
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}
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function sendMessage(event) {
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var input = document.getElementById("messageText")
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ws.send(input.value)
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input.value = ''
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event.preventDefault()
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}
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</script>
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</body>
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</html>
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"""
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@app.get("/")
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async def get():
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return HTMLResponse(html)
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async def get_cookie_or_token(
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websocket: WebSocket,
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session: Union[str, None] = Cookie(default=None),
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token: Union[str, None] = Query(default=None),
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):
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if session is None and token is None:
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raise WebSocketException(code=status.WS_1008_POLICY_VIOLATION)
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return session or token
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@app.websocket("/items/{item_id}/ws")
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async def websocket_endpoint(
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websocket: WebSocket,
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item_id: str,
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q: Union[int, None] = None,
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cookie_or_token: str = Depends(get_cookie_or_token),
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):
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await websocket.accept()
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while True:
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data = await websocket.receive_text()
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await websocket.send_text(
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f"Session cookie or query token value is: {cookie_or_token}"
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)
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if q is not None:
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await websocket.send_text(f"Query parameter q is: {q}")
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await websocket.send_text(f"Message text was: {data}, for item ID: {item_id}")
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