I am currently working on a NodeJS script to reverse-proxy client requests by creating pre-signed URLs for S3 objects being requested.
For instance, when a user accesses the website at build.localhost:8080, the 'build' subdomain corresponds to a folder where the NodeJS proxy will serve the index.html file located inside the 'build' folder.
The 'build' folder contains all the necessary files generated by running the npm run build command in order to host the static site with the help of the NodeJS script.
Below is the code snippet:
const express = require('express');
const httpProxy = require('http-proxy');
const AWS = require('aws-sdk');
var credentials = new AWS.SharedIniFileCredentials({profile: 'saml'});
AWS.config.credentials = credentials;
const s3 = new AWS.S3();
function getPreSignedUrl(key){
const myBucket = 'test-react-bucket-dev';
const signedUrlExpireSeconds = 60 * 5;
return new Promise((resolve, reject) => {
s3.getSignedUrl('getObject', {
Bucket: myBucket,
Key: key,
Expires: signedUrlExpireSeconds
}, (err, url) => {
if (err) reject(err);
else resolve(url);
});
});
}
const app = express();
const PORT = 8080;
const proxy = httpProxy.createProxyServer();
app.get('*', async (req, res) => {
const hostname = req.hostname;
const subdomain = hostname.split('.')[0];
let key = subdomain + (req.path === '/' ? '/index.html' : req.path);
try {
const resolvesTo = await getPreSignedUrl(key);
proxy.web(req, res, { target: resolvesTo, changeOrigin: true });
} catch (error) {
console.error("Error:", error);
res.status(500).send("Error proxying the request");
}
});
proxy.on('proxyReq', (proxyReq, req, res) => {
const url = req.url;
req.rawHeaders = []
if (url === '/')
proxyReq.path += 'index.html';
console.log(req.rawHeaders)
});
app.listen(PORT, () => console.log(`Reverse Proxy Running..${PORT}`));
And here's the encountered error:
<Error class="hidden">
<link type="text/css" id="dark-mode" rel="stylesheet" href=""/>
<style type="text/css" id="dark-mode-сustom-style"/>
<style type="text/css" id="dark-mode-theme-changer-style"/>
<Code>SignatureDoesNotMatch</Code>
<Message>The request signature we calculated does not match the signature you provided. Check your key and signing method.</Message>
<AWSAccessKeyId>ASIAR---REDACTED---EIYB</AWSAccessKeyId>
<StringToSign>GET 1707814358 x-amz-security-token:FwoGZXIvYXdzEKf//////////wEaDDy3nYkyTaxu1hEt6iLnAcXSYnhu0Oq0K7AeEc/quuBjIyqMfZON6gbHFZ3/ZLi7yDwPtdlKsiacTDSKiav1XuQI1WP+aXePJ+RwgtJesC177Jmfg=/index.html /test-react-bucket-jk/build/index.html</StringToSign>
<SignatureProvided>mlC4fkhNSMavJk8R45i6T+QRBr8=</SignatureProvided>
<StringToSignBytes>47 45 54 0a 0a 0a 31 37 30........</StringToSignBytes>
<RequestId>S3T66NPSHTKCDAQ7</RequestId>
<HostId>7EPjXVhzo2S3fBt7fNivJjlnpzcM7Ii9lbsQG4rXYDsoI25+vYvCMS6Cfy1uvVpkHRQVBsqZZI8=</HostId>
</Error>
Your assistance in resolving this issue would be greatly appreciated. Thank you!