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proxy-server.js
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191 lines (168 loc) · 4.6 KB
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'use strict';
const net = require('net');
const http = require('http');
const assert = require('assert');
function logRequest(logs, req) {
logs.push({
method: req.method,
url: req.url,
headers: { ...req.headers },
});
}
// This creates a minimal proxy server that logs the requests it gets
// to an array before performing proxying.
exports.createProxyServer = function(options = {}) {
const logs = [];
let proxy;
if (options.https) {
const common = require('../common');
if (!common.hasCrypto) {
common.skip('missing crypto');
}
proxy = require('https').createServer({
cert: require('./fixtures').readKey('agent9-cert.pem'),
key: require('./fixtures').readKey('agent9-key.pem'),
});
} else {
proxy = http.createServer();
}
proxy.on('request', (req, res) => {
logRequest(logs, req);
const [hostname, port] = req.headers.host.split(':');
const targetPort = port || 80;
const url = new URL(req.url);
const options = {
hostname: hostname,
port: targetPort,
path: url.pathname + url.search, // Convert back to relative URL.
method: req.method,
headers: {
...req.headers,
'connection': req.headers['proxy-connection'] || 'close',
},
};
const proxyReq = http.request(options, (proxyRes) => {
res.writeHead(proxyRes.statusCode, proxyRes.headers);
proxyRes.pipe(res, { end: true });
});
proxyReq.on('error', (err) => {
logs.push({ error: err, source: 'proxy request' });
if (!res.headersSent) {
res.writeHead(500);
}
if (!res.writableEnded) {
res.end(`Proxy error ${err.code}: ${err.message}`);
}
});
res.on('error', (err) => {
logs.push({ error: err, source: 'proxy response' });
});
req.pipe(proxyReq, { end: true });
});
proxy.on('connect', (req, res, head) => {
logRequest(logs, req);
const [hostname, port] = req.url.split(':');
res.on('error', (err) => {
logs.push({ error: err, source: 'proxy response' });
});
const proxyReq = net.connect(port, hostname, () => {
res.write(
'HTTP/1.1 200 Connection Established\r\n' +
'Proxy-agent: Node.js-Proxy\r\n' +
'\r\n',
);
proxyReq.write(head);
res.pipe(proxyReq);
proxyReq.pipe(res);
});
proxyReq.on('error', (err) => {
logs.push({ error: err, source: 'proxy request' });
res.write('HTTP/1.1 500 Connection Error\r\n\r\n');
res.end('Proxy error: ' + err.message);
});
});
proxy.on('error', (err) => {
logs.push({ error: err, source: 'proxy server' });
});
return { proxy, logs };
};
function spawnPromisified(...args) {
const { spawn } = require('child_process');
let stderr = '';
let stdout = '';
const child = spawn(...args);
child.stderr.setEncoding('utf8');
child.stderr.on('data', (data) => {
console.error('[STDERR]', data);
stderr += data;
});
child.stdout.setEncoding('utf8');
child.stdout.on('data', (data) => {
console.log('[STDOUT]', data);
stdout += data;
});
return new Promise((resolve, reject) => {
child.on('close', (code, signal) => {
console.log('[CLOSE]', code, signal);
resolve({
code,
signal,
stderr,
stdout,
});
});
child.on('error', (code, signal) => {
console.log('[ERROR]', code, signal);
reject({
code,
signal,
stderr,
stdout,
});
});
});
}
exports.checkProxiedFetch = async function(envExtension, expectation, cliArgsExtension = []) {
const fixtures = require('./fixtures');
const { code, signal, stdout, stderr } = await spawnPromisified(
process.execPath,
[...cliArgsExtension, fixtures.path('fetch-and-log.mjs')], {
env: {
...process.env,
...envExtension,
},
});
assert.deepStrictEqual({
stderr: stderr.trim(),
stdout: stdout.trim(),
code,
signal,
}, {
stderr: '',
code: 0,
signal: null,
...expectation,
});
};
exports.runProxiedRequest = async function(envExtension, cliArgsExtension = []) {
const fixtures = require('./fixtures');
return spawnPromisified(
process.execPath,
[...cliArgsExtension, fixtures.path('request-and-log.js')], {
env: {
...process.env,
...envExtension,
},
});
};
exports.runProxiedPOST = async function(envExtension) {
const fixtures = require('./fixtures');
return spawnPromisified(
process.execPath,
[fixtures.path('post-resource-and-log.js')], {
env: {
...process.env,
...envExtension,
},
});
};