Replaced helmet, cors & policy w/ local implem.

The used functionality of helmet, cors & referrer-policy has been
defined in setupCors and setupHeaders.

middleware/setupCORS.js

@@ -0,0 +1,6 @@
+const openCORS = (req, res, next) => {
+  res.set("Access-Control-Allow-Origin", "*")
+  return next();
+};
+
+module.exports = openCORS;

middleware/setupHeaders.js

@@ -0,0 +1,37 @@
+const camelToKebabCase = str => str.replace(/[A-Z]/g, letter => `-${letter.toLowerCase()}`);
+
+const mapFeaturePolicyToString = (features) => {
+  return Object.entries(features).map(([key, value]) => {
+    key = camelToKebabCase(key)
+    value = value == "*" ? value : `'${ value }'`
+    return `${key} ${value}`
+  }).join("; ")
+}
+
+const setupHeaders = (req, res, next) => {
+  res.set("Access-Control-Allow-Headers", "Content-Type")
+
+  // Security
+  res.set("X-Content-Type-Options", "nosniff");
+  res.set("X-XSS-Protection", "1; mode=block");
+  res.set("X-Frame-Options", "SAMEORIGIN");
+  res.set("X-DNS-Prefetch-Control", "off");
+  res.set("X-Download-Options", "noopen");
+  res.set("Strict-Transport-Security", "max-age=15552000; includeSubDomains")
+
+  // Feature policy
+  const features = {
+    fullscreen: "*",
+    payment: "none",
+    microphone: "none",
+    camera: "self",
+    speaker: "*",
+    syncXhr: "self"
+  }
+  const featureString = mapFeaturePolicyToString(features);
+  res.set("Feature-Policy", featureString)
+
+  return next();
+}
+
+module.exports = setupHeaders;

package.json

@@ -18,16 +18,12 @@
     "canvas-confetti": "^1.2.0",
     "chart.js": "^2.9.3",
     "clean-webpack-plugin": "^3.0.0",
-    "compression": "^1.7.4",
     "connect-mongo": "^3.2.0",
-    "cors": "^2.8.5",
     "express": "^4.17.1",
     "express-session": "^1.17.0",
     "extract-text-webpack-plugin": "^3.0.2",
-    "feature-policy": "^0.4.0",
-    "helmet": "^3.21.2",
     "moment": "^2.24.0",
-    "mongoose": "^5.8.7",
+    "mongoose": "^5.10.9",
     "node-fetch": "^2.6.0",
     "node-sass": "^4.13.0",
     "node-schedule": "^1.3.2",
@@ -35,7 +31,6 @@
     "passport-local": "^1.0.0",
     "passport-local-mongoose": "^6.0.1",
     "qrcode": "^1.4.4",
-    "referrer-policy": "^1.2.0",
     "socket.io": "^2.3.0",
     "socket.io-client": "^2.3.0",
     "vue": "~2.6",

server.js

@@ -19,32 +19,12 @@ const bodyParser = require("body-parser");
 
 const mongoose = require("mongoose");
 const MongoStore = require("connect-mongo")(session);
-const cors = require("cors");
 
-const referrerPolicy = require("referrer-policy");
-const helmet = require("helmet");
-const featurePolicy = require("feature-policy");
-
-const compression = require("compression");
-app.use(compression());
-
-app.use(
-  featurePolicy({
-    features: {
-      fullscreen: ["*"],
-      //vibrate: ["'none'"],
-      payment: ["'none'"],
-      microphone: ["'none'"],
-      camera: ["'self'"],
-      speaker: ["*"],
-      syncXhr: ["'self'"]
-      //notifications: ["'self'"]
-    }
-  })
-);
-app.use(helmet());
-app.use(helmet.frameguard({ action: "sameorigin" }));
-app.use(referrerPolicy({ policy: "origin" }));
+// middleware
+const setupCORS = require(path.join(__dirname, "/middleware/setupCORS"));
+const setupHeaders = require(path.join(__dirname, "/middleware/setupHeaders"));
+app.use(setupCORS)
+app.use(setupHeaders)
 
 app.use(cors());
 mongoose.promise = global.Promise;