change image links from public to local (#5)

* change image links from public to local
Apply endemecio02/node-red-contrib-httpauth#3 from @sakazuki

* Fix path join

* Use Express built-in methods

* Minor syntax

nodes/http-auth.html

@@ -71,7 +71,7 @@
 </p>
 
 <p>
-	<img src="https://raw.githubusercontent.com/alexandrainst/node-red-http-basic-auth/main/images/flow.png" />
+	<img src="node-red-http-basic-auth/images/flow.png" />
 <p>
 
 <h2>Config</h2>

nodes/http-auth.js

@@ -99,4 +99,20 @@ module.exports = function (RED) {
 	}
 
 	RED.nodes.registerType('http-basic-auth', HttpAuthNode);
+
+	if (RED.httpAdmin) {
+		const path = require('path');
+		RED.httpAdmin.get('/node-red-http-basic-auth/images/:name', (req, res, next) => {
+			const options = {
+				root: path.join(__dirname, '..', 'images'),
+				dotfiles: 'deny',
+			};
+			const fileName = req.params.name;
+			res.sendFile(fileName, options, (err) => {
+				if (err) {
+					next(err);
+				}
+			});
+		});
+	}
 };