Add forwarder

forwarder/.dockerignore

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+node_modules
+npm-debug.log

forwarder/bin/proxy.js

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+// include dependencies
+const express = require('express');
+const debug = require('debug')('broker:proxy');
+const { createProxyMiddleware } = require('http-proxy-middleware');
+
+const app = express();
+
+const target = process.env.CONTEXT_BROKER || 'http://orion:1026';
+const tenant = process.env.TENANT || 'farmer';
+
+// create the proxy
+/** @type {import('http-proxy-middleware/dist/types').RequestHandler<express.Request, express.Response>} */
+const exampleProxy = createProxyMiddleware({
+  target, // target host with the same base path
+  changeOrigin: true, // needed for virtual hosted sites
+  on: {
+    proxyReq: (proxyReq, req, res) => {
+      debug(req.originalUrl);
+      proxyReq.setHeader('NGSILD-Tenant', tenant);
+    }
+  }
+});
+
+// mount `exampleProxy` in web server
+app.use('/', exampleProxy);
+app.listen(80);

forwarder/package.json

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+{
+  "name": "proxy",
+  "license": "AGPL-3.0-only",
+  "description": "Simple forwarding proxy",
+  "version": "1.0.0",
+  "main": "bin/proxy.js",
+  "engines": {
+    "node": ">=16"
+  },
+  "scripts": {
+    "start": "node ./bin/proxy",
+    "prettier": "prettier --parser flow --single-quote --write **/**/*.js  **/*.js *.js"
+  },
+  "dependencies": {
+    "debug": "^4.3.4",
+    "express": "^4.19.2",
+    "http-proxy-middleware": "^3.0.0"
+  },
+  "devDependencies": {
+    "prettier": "~1.14.2"
+  },
+  "keywords": []
+}