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proxy.js
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proxy.js
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/**************
* This is a slightly modified version of its source:
* https://gist.github.com/mizzy/1342667/f861258311df61b0691ebf9c3d59e1a0030d32de#gistcomment-2870324
*/
const http = require('http');
const url = require('url');
/**********
* Set these to connect to your Nagios server
*/
const NAGIOS_HOST = '192.168.1.100';
// Leave USER and PASS blank if you'd disabled Auth on the Nagios Server
const NAGIOS_USER = 'nagiosadmin';
const NAGIOS_PASS = 'mypassword';
/**********
* Use these to control the local proxy
*/
const PROXY_PORT = 8080;
const DEBUG = false;
/**********
* Create the proxy and run it.
*/
const proxy = http.createServer((req, res) => {
const request = url.parse(req.url);
const options = {
host: request.hostname,
port: request.port || 80,
path: request.path,
method: req.method,
headers: req.headers,
};
options.host = NAGIOS_HOST;
if (NAGIOS_USER && NAGIOS_PASS) {
const auth = 'Basic ' + Buffer.from(NAGIOS_USER + ':' + NAGIOS_PASS).toString('base64');
options.headers['Authorization'] = auth;
}
console.log(`${options.method} http://${options.host}${options.path}`);
if (DEBUG) console.log(options.headers);
const backend_req = http.request(options, (backend_res) => {
// CORS don't care header
backend_res.headers['Access-Control-Allow-Origin'] = '*';
if (DEBUG) console.log(backend_res.headers)
console.log('RESP', backend_res.statusCode, backend_res.statusMessage, backend_res.url)
res.writeHead(backend_res.statusCode, backend_res.headers);
backend_res.on('data', (chunk) => {
res.write(chunk);
});
backend_res.on('end', () => {
res.end();
});
});
backend_req.on('error', err => console.error(`ERROR PROXYING REQUEST TO ${options.host}\n`, err));
req.on('error', err => {
console.error('ERROR:', err)
});
req.on('data', (chunk) => {
backend_req.write(chunk);
});
req.on('end', () => {
backend_req.end();
});
});
proxy.on('listening', ()=>{
console.log(`[Nagios Proxy Server]
Listening at : http://localhost:${PROXY_PORT}/
username : ${NAGIOS_USER}
`);
})
proxy.listen(PROXY_PORT);