v3: add securing examples

Author: ivarconr

.gitignore

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+node_modules

v3/securing-basic-auth/basic-auth-hook.js

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+const auth = require('basic-auth');
+const { User } = require('unleash-server');
+
+function basicAuthentication(app) {
+    app.use('/api/admin/', (req, res, next) => {
+        const credentials = auth(req);
+
+        if (credentials) {
+            // you will need to do some verification of credentials here.
+            const user = new User({ email: `${credentials.name}@domain.com` });
+            req.user = user;
+            return next();
+        }
+
+        return res
+            .status('401')
+            .set({ 'WWW-Authenticate': 'Basic realm="example"' })
+            .end('access denied');
+    });
+}
+
+module.exports = basicAuthentication;

v3/securing-basic-auth/index.js

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+const unleash = require('unleash-server');
+
+const basicAuth = require('./basic-auth-hook');
+
+unleash.start({
+    databaseUrl: 'postgres://unleash_user:passord@localhost:5432/unleash',
+    adminAuthentication: 'custom',
+    preRouterHook: basicAuth,
+});