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import proxyServer from "http-proxy"

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

export const proxy = proxyServer.createProxyServer({})

// The error handler catches when the proxy fails to connect (for example when

// there is nothing running on the target port).

proxy.on("error", (error, _, res) => {

// This could be for either a web socket or a regular request. Despite what

// the types say, writeHead() will not exist on web socket requests (nor will

// status() from Express). But writing out the code manually does not work

// for regular requests thus the branching behavior.

if (typeof res.writeHead !== "undefined") {

res.writeHead(HttpCode.ServerError)

res.end(error.message)

} else {

res.end(`HTTP/1.1 ${HttpCode.ServerError} ${error.message}\r\n\r\n`)

}

})

// Intercept the response to rewrite absolute redirects against the base path.

// Is disabled when the request has no base path which means /absproxy is in use.

proxy.on("proxyRes", (res, req) => {

if (res.headers.location && res.headers.location.startsWith("/") && (req as any).base) {

res.headers.location = (req as any).base + res.headers.location

}

})