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251 lines (212 loc) · 7.59 KB
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Copy pathindex.js
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251 lines (212 loc) · 7.59 KB
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const os = require('os');
const jwt = require('jsonwebtoken');
const http = require('http')
const https = require('https')
const morgan = require('morgan');
const express = require('express')
const concat = require('concat-stream');
const { promisify } = require('util');
const promBundle = require("express-prom-bundle");
const zlib = require("zlib");
const {
PROMETHEUS_ENABLED = false,
PROMETHEUS_METRICS_PATH = '/metrics',
PROMETHEUS_WITH_PATH = false,
PROMETHEUS_WITH_METHOD = 'true',
PROMETHEUS_WITH_STATUS = 'true',
PROMETHEUS_METRIC_TYPE = 'summary',
MAX_HEADER_SIZE = 1048576
} = process.env
const maxHeaderSize = parseInt(MAX_HEADER_SIZE, 10) || 1048576;
const sleep = promisify(setTimeout);
const metricsMiddleware = promBundle({
metricsPath: PROMETHEUS_METRICS_PATH,
includePath: (PROMETHEUS_WITH_PATH == 'true'),
includeMethod: (PROMETHEUS_WITH_METHOD == 'true'),
includeStatusCode: (PROMETHEUS_WITH_STATUS == 'true'),
metricType: PROMETHEUS_METRIC_TYPE,
});
const app = express()
app.set('json spaces', 2);
app.set('trust proxy', ['loopback', 'linklocal', 'uniquelocal']);
if(PROMETHEUS_ENABLED === 'true') {
app.use(metricsMiddleware);
}
if(process.env.DISABLE_REQUEST_LOGS !== 'true'){
app.use(morgan('combined'));
}
app.use(function(req, res, next){
req.pipe(concat(function(data){
if (req.get("Content-Encoding") === "gzip") {
req.body = zlib.gunzipSync(data).toString('utf8');
}
else {
req.body = data.toString('utf8');
}
next();
}));
});
//Handle all paths
app.all('*', (req, res) => {
const echo = {
path: req.path,
headers: req.headers,
method: req.method,
body: req.body,
cookies: req.cookies,
fresh: req.fresh,
hostname: req.hostname,
ip: req.ip,
ips: req.ips,
protocol: req.protocol,
query: req.query,
subdomains: req.subdomains,
xhr: req.xhr,
os: {
hostname: os.hostname()
},
connection: {
servername: req.connection.servername
}
};
if(process.env.PRESERVE_HEADER_CASE){
let newHeaders = {...req.headers};
// req.headers is in lowercase, processed, deduplicated. req.rawHeaders is not.
// Match on the preserved case of the header name, populate newHeaders with preserved case and processed value.
for (let i = 0; i < req.rawHeaders.length; i += 2) {
let preservedHeaderName = req.rawHeaders[i];
if (preservedHeaderName == preservedHeaderName.toLowerCase()) { continue; }
newHeaders[preservedHeaderName] = req.header(preservedHeaderName);
delete newHeaders[preservedHeaderName.toLowerCase()];
}
echo.headers = newHeaders;
}
//Add client certificate details to the output, if present
//This only works if `requestCert` is true when starting the server.
if(req.socket.getPeerCertificate){
echo.clientCertificate = req.socket.getPeerCertificate();
}
//Include visible environment variables
if(process.env.ECHO_INCLUDE_ENV_VARS){
echo.env = process.env;
}
//If the Content-Type of the incoming body `is` JSON, it can be parsed and returned in the body
if(req.is('application/json')){
try {
echo.json = JSON.parse(req.body)
} catch (error) {
console.warn("Invalid JSON Body received with Content-Type: application/json", error);
}
}
//If there's a JWT header, parse it and decode and put it in the response
if (process.env.JWT_HEADER) {
let token = req.headers[process.env.JWT_HEADER.toLowerCase()];
if (!token) {
echo.jwt = token;
} else {
token = token.split(" ").pop();
const decoded = jwt.decode(token, {complete: true});
echo.jwt = decoded;
}
}
//Set the status code to what the user wants
const setResponseStatusCode = parseInt(req.headers["x-set-response-status-code"] || req.query["x-set-response-status-code"] || process.env.RESPONSE_STATUS_CODE, 10)
if (100 <= setResponseStatusCode && setResponseStatusCode < 600) {
res.status(setResponseStatusCode)
}
//Delay the response for a user defined time
const sleepTime = parseInt(req.headers["x-set-response-delay-ms"]
|| req.query["x-set-response-delay-ms"]
|| process.env.RESPONSE_DELAY_MS
|| "0")
sleep(sleepTime).then(() => {
//Set the response content type to what the user wants
const setResponseContentType = req.headers["x-set-response-content-type"]
|| req.query["x-set-response-content-type"]
|| process.env.RESPONSE_CONTENT_TYPE;
if(setResponseContentType){
res.contentType(setResponseContentType);
}
//Set the CORS policy
if (process.env.CORS_ALLOW_ORIGIN){
res.header('Access-Control-Allow-Origin', process.env.CORS_ALLOW_ORIGIN);
if (process.env.CORS_ALLOW_METHODS) {
res.header('Access-Control-Allow-Methods', process.env.CORS_ALLOW_METHODS);
}
if (process.env.CORS_ALLOW_HEADERS) {
res.header('Access-Control-Allow-Headers', process.env.CORS_ALLOW_HEADERS);
}
if (process.env.CORS_ALLOW_CREDENTIALS) {
res.header('Access-Control-Allow-Credentials', process.env.CORS_ALLOW_CREDENTIALS);
}
}
//Ability to send an empty response back
if (process.env.ECHO_BACK_TO_CLIENT != undefined && process.env.ECHO_BACK_TO_CLIENT == "false"){
res.end();
}
//Ability to send an content of file as response body
else if (process.env.OVERRIDE_RESPONSE_BODY_FILE_PATH){
// Path is relative to current directory
res.sendFile(process.env.OVERRIDE_RESPONSE_BODY_FILE_PATH, { root : __dirname});
}
//Ability to send an content of environment variable as response body
else if (process.env.OVERRIDE_RESPONSE_BODY){
res.send(process.env.OVERRIDE_RESPONSE_BODY);
}
//Ability to send just the request body in the response, nothing else
else if ((req.query["response_body_only"] === "true") || (process.env.RESPONSE_BODY_ONLY === "true")) {
res.send(req.body);
}
//Normal behavior, send everything back
else {
res.json(echo);
}
//Certain paths can be ignored in the container logs, useful to reduce noise from healthchecks
if (!process.env.LOG_IGNORE_PATH || !new RegExp(process.env.LOG_IGNORE_PATH).test(req.path)) {
let spacer = 4;
if(process.env.LOG_WITHOUT_NEWLINE){
spacer = null;
}
console.log(JSON.stringify(echo, null, spacer));
}
});
});
let httpOpts = {
maxHeaderSize: maxHeaderSize
}
let httpsOpts = {
key: require('fs').readFileSync(process.env.HTTPS_KEY_FILE || 'testpk.pem'),
cert: require('fs').readFileSync(process.env.HTTPS_CERT_FILE || 'fullchain.pem'),
maxHeaderSize: maxHeaderSize
};
//Whether to enable the client certificate feature
if(process.env.MTLS_ENABLE){
httpsOpts = {
requestCert: true,
rejectUnauthorized: false,
...httpsOpts
}
}
var httpServer = http.createServer(httpOpts, app).listen(process.env.HTTP_PORT || 8080);
var httpsServer = https.createServer(httpsOpts,app).listen(process.env.HTTPS_PORT || 8443);
console.log(`Listening on ports ${process.env.HTTP_PORT || 8080} for http, and ${process.env.HTTPS_PORT || 8443} for https.`);
let calledClose = false;
process.on('exit', function () {
if (calledClose) return;
console.log('Got exit event. Trying to stop Express server.');
server.close(function() {
console.log("Express server closed");
});
});
process.on('SIGINT', shutDown);
process.on('SIGTERM', shutDown);
function shutDown(){
console.log('Got a kill signal. Trying to exit gracefully.');
calledClose = true;
httpServer.close(function() {
httpsServer.close(function() {
console.log("HTTP and HTTPS servers closed. Asking process to exit.");
process.exit()
});
});
}