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Replace node-http-proxy with ProxyCore
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,130 @@ | ||
| const http = require("http"); | ||
| const https = require("https"); | ||
| const tls = require("tls"); | ||
| const net = require("net"); | ||
|
|
||
| class ProxyCore { | ||
| getModules(urlString) { | ||
| const url = new URL(urlString); | ||
| if (url.protocol === "https:") return [https, tls]; | ||
| if (url.protocol === "http:") return [http, net]; | ||
| throw new Error(`Unsupported protocol ${url.protocol}`); | ||
| } | ||
|
|
||
| async proxyRequest({ request, response, upstream, ssl }) { | ||
| const upstreamUrl = new URL(upstream); | ||
| const { hostname, port } = upstreamUrl; | ||
| const upstreamRequestOptions = { | ||
| method: request.method, | ||
| host: hostname, | ||
| port, | ||
| path: request.url, | ||
| setHost: false, | ||
| headers: this.transformRequestHeaders(request.headers, { | ||
| upstreamUrl, | ||
| request, | ||
| ssl | ||
| }) | ||
| }; | ||
| const upstreamRequest = this.getModules(upstream)[0].request( | ||
| upstreamRequestOptions | ||
| ); | ||
|
|
||
| request.pipe(upstreamRequest); | ||
| request.on("error", () => upstreamRequest.destroy()); | ||
| upstreamRequest.on("error", () => { | ||
| if (response.headersSent) { | ||
| request.destroy(); | ||
| } else { | ||
| response.writeHead(502, { | ||
| "Content-Type": "text/plain" | ||
| }); | ||
| response.end("Bad Gateway"); | ||
| } | ||
| }); | ||
|
|
||
| upstreamRequest.on("response", upstreamResponse => { | ||
| const { statusCode, statusMessage } = upstreamResponse; | ||
| const headers = this.transformResponseHeaders(upstreamResponse.headers, { | ||
| upstreamUrl, | ||
| request, | ||
| ssl | ||
| }); | ||
| response.writeHead(statusCode, statusMessage, headers); | ||
| response.flushHeaders(); | ||
| upstreamResponse.pipe(response); | ||
| upstreamResponse.on("error", () => response.destroy()); | ||
| response.on("error", () => upstreamResponse.destroy()); | ||
| }); | ||
|
|
||
| await new Promise(resolve => { | ||
| upstreamRequest.on("close", resolve); | ||
| }); | ||
| } | ||
|
|
||
| async proxyUpgrade({ request, socket, head, upstream, ssl }) { | ||
| const upstreamUrl = new URL(upstream); | ||
| const upstreamConnectOptions = { | ||
| host: upstreamUrl.hostname, | ||
| port: upstreamUrl.port || (ssl ? 443 : 80), | ||
| servername: upstreamUrl.hostname | ||
| }; | ||
| const upstreamSocket = this.getModules(upstream)[1].connect( | ||
| upstreamConnectOptions | ||
| ); | ||
| const upsteamHeaders = this.transformRequestHeaders(request.headers, { | ||
| upstreamUrl, | ||
| ssl, | ||
| request | ||
| }); | ||
| const upsteamPath = request.url; | ||
| socket.unshift( | ||
| Buffer.concat([ | ||
| Buffer.from( | ||
| [ | ||
| `${request.method} ${upsteamPath} HTTP/${request.httpVersion}`, | ||
| ...Object.entries(upsteamHeaders).map( | ||
| ([name, value]) => `${name}: ${value}` | ||
| ) | ||
| ].join("\r\n") | ||
| ), | ||
| Buffer.from("\r\n\r\n"), | ||
| head | ||
| ]) | ||
| ); | ||
| socket.pipe(upstreamSocket).pipe(socket); | ||
| socket.on("error", () => upstreamSocket.destroy()); | ||
| upstreamSocket.on("error", () => socket.destroy()); | ||
|
|
||
| await new Promise(resolve => { | ||
| upstreamSocket.on("connect", resolve); | ||
| }); | ||
| } | ||
|
|
||
| transformRequestHeaders(headers, { upstreamUrl, ssl, request }) { | ||
| const headersTransformed = { ...headers }; | ||
| // generate xfwd headers | ||
| const origAddr = request.socket.remoteAddress.replace("::ffff:", ""); | ||
| const origPort = request.socket.localPort; | ||
| const origProto = ssl ? "https" : "http"; | ||
| for (const [suffix, value, append] of [ | ||
| ["for", origAddr, true], | ||
| ["port", origPort, false], | ||
| ["proto", origProto, false] | ||
| ]) { | ||
| const name = `x-forwarded-${suffix}`; | ||
| if (headersTransformed[name] && append) | ||
| headersTransformed[name] = `${headersTransformed[name]},${value}`; | ||
| else headersTransformed[name] = value; | ||
| } | ||
| return headersTransformed; | ||
| } | ||
|
|
||
| transformResponseHeaders(headers) { | ||
| return { | ||
| ...headers | ||
| }; | ||
| } | ||
| } | ||
|
|
||
| module.exports = ProxyCore; |
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