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import * as express from "express"

import * as expressCore from "express-serve-static-core"

import * as http from "http"

import * as stream from "stream"

import Websocket from "ws"

export interface WebsocketRequest extends express.Request {

ws: stream.Duplex

head: Buffer

}

interface InternalWebsocketRequest extends WebsocketRequest {

_ws_handled: boolean

}

export const handleUpgrade = (app: express.Express, server: http.Server): void => {

server.on("upgrade", (req, socket, head) => {

socket.pause()

const wreq = req as InternalWebsocketRequest

wreq.ws = socket

wreq.head = head

wreq._ws_handled = false

// Send the request off to be handled by Express.

;(app as any).handle(wreq, new http.ServerResponse(wreq), () => {

if (!wreq._ws_handled) {

socket.end("HTTP/1.1 404 Not Found\r\n\r\n")

}

})

})

}

export type WebSocketHandler = (

req: WebsocketRequest,

res: express.Response,

next: express.NextFunction,

) => void | Promise<void>

export class WebsocketRouter {

public readonly router = express.Router()

/**

* Handle a websocket at this route. Note that websockets are immediately

* paused when they come in.

*

* If the origin header exists it must match the host or the connection will

* be prevented.

*/

public ws(route: expressCore.PathParams, ...handlers: WebSocketHandler[]): void {

this.router.get(

route,

...handlers.map((handler) => {

const wrapped: express.Handler = (req, res, next) => {

;(req as InternalWebsocketRequest)._ws_handled = true

return handler(req as WebsocketRequest, res, next)

}

return wrapped

}),

)

}

}

export function Router(): WebsocketRouter {

return new WebsocketRouter()

}

export const wss = new Websocket.Server({ noServer: true })