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server.ts

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import { field, logger } from "@coder/logger"

import * as http from "http"

import * as net from "net"

import * as ws from "ws"

import {

Application,

ApplicationsResponse,

ClientMessage,

FilesResponse,

LoginRequest,

LoginResponse,

ServerMessage,

} from "../../common/api"

import { ApiEndpoint, HttpCode } from "../../common/http"

import { normalize } from "../../common/util"

import { HttpProvider, HttpProviderOptions, HttpResponse, HttpServer, Route } from "../http"

import { hash } from "../util"

export const Vscode: Application = {

name: "VS Code",

path: "/",

embedPath: "./vscode-embed",

}

/**

* API HTTP provider.

*/

export class ApiHttpProvider extends HttpProvider {

private readonly ws = new ws.Server({ noServer: true })

public constructor(options: HttpProviderOptions, private readonly server: HttpServer) {

super(options)

}

public async handleRequest(route: Route, request: http.IncomingMessage): Promise<HttpResponse | undefined> {

switch (route.base) {

case ApiEndpoint.login:

if (request.method === "POST") {

return this.login(request)

}

break

}

if (!this.authenticated(request)) {

return { code: HttpCode.Unauthorized }

}

switch (route.base) {

case ApiEndpoint.applications:

return this.applications()

case ApiEndpoint.files:

return this.files()

}

return undefined

}

public async handleWebSocket(

_route: Route,

request: http.IncomingMessage,

socket: net.Socket,

head: Buffer

): Promise<true> {

if (!this.authenticated(request)) {

throw new Error("not authenticated")

}

await new Promise<ws>((resolve) => {

this.ws.handleUpgrade(request, socket, head, (ws) => {

const send = (event: ServerMessage): void => {

ws.send(JSON.stringify(event))

}

ws.on("message", (data) => {

logger.trace("got message", field("message", data))

try {

const message: ClientMessage = JSON.parse(data.toString())

this.getMessageResponse(message.event).then(send)

} catch (error) {

logger.error(error.message, field("message", data))

}

})

resolve()

})

})

return true

}

private async getMessageResponse(event: "health"): Promise<ServerMessage> {

switch (event) {

case "health":

return { event, connections: await this.server.getConnections() }

default:

throw new Error("unexpected message")

}

}

/**

* Return OK and a cookie if the user is authenticated otherwise return

* unauthorized.

*/

private async login(request: http.IncomingMessage): Promise<HttpResponse<LoginResponse>> {

// Already authenticated via cookies?

const providedPassword = this.authenticated(request)

if (providedPassword) {

return { code: HttpCode.Ok }

}

const data = await this.getData(request)

const payload: LoginRequest = data ? JSON.parse(data) : {}

const password = this.authenticated(request, {

key: typeof payload.password === "string" ? [hash(payload.password)] : undefined,

})

if (password) {

return {

content: {

success: true,

// TEMP: Auto-load VS Code.

app: Vscode,

},

cookie:

typeof password === "string"

? {

key: "key",

value: password,

path: normalize(payload.basePath),

}

: undefined,

}

}

// Only log if it was an actual login attempt.

if (payload && payload.password) {

console.error(

"Failed login attempt",

JSON.stringify({

xForwardedFor: request.headers["x-forwarded-for"],

remoteAddress: request.connection.remoteAddress,

userAgent: request.headers["user-agent"],

timestamp: Math.floor(new Date().getTime() / 1000),

})

)

}

return { code: HttpCode.Unauthorized }

}

/**

* Return files at the requested directory.

*/

private async files(): Promise<HttpResponse<FilesResponse>> {

return {

content: {

files: [],

},

}

}

/**

* Return available applications.

*/

private async applications(): Promise<HttpResponse<ApplicationsResponse>> {

return {

content: {

applications: [Vscode],

},

}

}

}