84 lines
2.5 KiB
TypeScript
84 lines
2.5 KiB
TypeScript
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import * as http from "http"
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import { HttpCode, HttpError } from "../../common/http"
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import { AuthType, HttpProvider, HttpProviderOptions, HttpResponse, Route } from "../http"
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/**
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* Proxy HTTP provider.
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*/
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export class ProxyHttpProvider extends HttpProvider {
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public constructor(options: HttpProviderOptions, private readonly proxyDomains: string[]) {
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super(options)
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}
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public async handleRequest(route: Route): Promise<HttpResponse> {
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if (this.options.auth !== AuthType.Password || route.requestPath !== "/index.html") {
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throw new HttpError("Not found", HttpCode.NotFound)
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}
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const payload = this.proxy(route.base.replace(/^\//, ""))
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if (!payload) {
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throw new HttpError("Not found", HttpCode.NotFound)
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}
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return payload
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}
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public async getRoot(route: Route, error?: Error): Promise<HttpResponse> {
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const response = await this.getUtf8Resource(this.rootPath, "src/browser/pages/login.html")
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response.content = response.content.replace(/{{ERROR}}/, error ? `<div class="error">${error.message}</div>` : "")
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return this.replaceTemplates(route, response)
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}
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/**
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* Return a response if the request should be proxied. Anything that ends in a
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* proxy domain and has a subdomain should be proxied. The port is found in
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* the top-most subdomain.
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*
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* For example, if the proxy domain is `coder.com` then `8080.coder.com` and
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* `test.8080.coder.com` will both proxy to `8080` but `8080.test.coder.com`
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* will have an error because `test` isn't a port. If the proxy domain was
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* `test.coder.com` then it would work.
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*/
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public maybeProxy(request: http.IncomingMessage): HttpResponse | undefined {
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const host = request.headers.host
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if (!host || !this.proxyDomains) {
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return undefined
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}
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const proxyDomain = this.proxyDomains.find((d) => host.endsWith(d))
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if (!proxyDomain) {
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return undefined
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}
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const proxyDomainLength = proxyDomain.split(".").length
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const portStr = host
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.split(".")
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.slice(0, -proxyDomainLength)
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.pop()
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if (!portStr) {
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return undefined
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}
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return this.proxy(portStr)
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}
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private proxy(portStr: string): HttpResponse {
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if (!portStr) {
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return {
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code: HttpCode.BadRequest,
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content: "Port must be provided",
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}
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}
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const port = parseInt(portStr, 10)
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if (isNaN(port)) {
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return {
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code: HttpCode.BadRequest,
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content: `"${portStr}" is not a valid number`,
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}
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}
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return {
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code: HttpCode.Ok,
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content: `will proxy this to ${port}`,
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}
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}
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}
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