From cd0496a690422fd966cfa152fa2de1de09d08fb3 Mon Sep 17 00:00:00 2001
From: Kayne Ruse <kayneruse@gmail.com>
Date: Thu, 13 Jun 2019 11:57:17 +1000
Subject: [PATCH] Added replacement.js

---
 common/replacement.js               | 60 +++++++++++++++++++++++++++++
 public/{index.html => index.html.t} |  4 +-
 server/index.js                     |  9 ++++-
 server/website_descriptions.json    |  6 +++
 4 files changed, 75 insertions(+), 4 deletions(-)
 create mode 100644 common/replacement.js
 rename public/{index.html => index.html.t} (90%)
 create mode 100644 server/website_descriptions.json

diff --git a/common/replacement.js b/common/replacement.js
new file mode 100644
index 0000000..592073d
--- /dev/null
+++ b/common/replacement.js
@@ -0,0 +1,60 @@
+//replacement(options)(key [, args...])
+//options - the json object containing all options
+//key - one of the keys in options
+//data (optional) - a number of arguments that are substituted into the resulting string
+const replacement = (options) => (key, ...data) => {
+	let result;
+
+	//randomize arrays
+	if (Array.isArray(options[key])) {
+		result = options[key][Math.floor(Math.random() * options[key].length)];
+	} else {
+		result = options[key];
+	}
+
+	//handle no result
+	if (result === undefined) {
+		const noResult = options["noResult"];
+		if (noResult === undefined) {
+			return ""; //nothing at all to show
+		}
+		//randomized noResult array
+		if (Array.isArray(noResult)) {
+			result = noResult[Math.floor(Math.random() * noResult.length)];
+		} else {
+			result = noResult;
+ 		 }
+	}
+
+	//replacement engine
+	let counter = 0;
+	data.map((dat) => {
+		counter++;
+		result = result.replace(/\{([1-9][0-9]*)\}/g, a => a === "{" + counter + "}" ? dat : a);
+	});
+
+	//return the final result
+	return result;
+};
+
+//templateReplacement(templateString [, args...])
+//templateString - the string to act as a template
+//data (optional) - a number of arguments that are substituted into the template string
+const stringReplacement = (templateString, ...data) => {
+	let result = templateString;
+
+	//replacement engine
+	let counter = 0;
+	data.map((dat) => {
+		counter++;
+		result = result.replace(/\{([1-9][0-9]*)\}/g, a => a === "{" + counter + "}" ? dat : a);
+	});
+
+	//return the final result
+	return result;
+}
+
+module.exports = {
+	replacement: replacement,
+	stringReplacement: stringReplacement
+};
\ No newline at end of file
diff --git a/public/index.html b/public/index.html.t
similarity index 90%
rename from public/index.html
rename to public/index.html.t
index 2fbdf4a..56c0950 100644
--- a/public/index.html
+++ b/public/index.html.t
@@ -7,7 +7,7 @@
 		<link rel="stylesheet" href="/styles/shared.css"/>
 
 		<title>Kingdom Battles!</title>
-		<meta name="description" content="Build Your Kingdom!" />
+		<meta name="description" content="{1}" />
 		<meta name="author" content="Kayne Ruse" />
 		<meta name="keywords" content="gaming, browser game, persistent browser based game, free game" />
 <!--
@@ -19,7 +19,7 @@
 		<meta property="og:image" content="https://kingdombattles.net/img/flag_scaled.png" />
 
 		<meta property="og:title" content="Kingdom Battles!" />
-		<meta property="og:description" content="Build Your Kingdom!" />
+		<meta property="og:description" content="{1}" />
 
 		<script async src="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>
 		<script>
diff --git a/server/index.js b/server/index.js
index ab4b069..6232362 100644
--- a/server/index.js
+++ b/server/index.js
@@ -6,10 +6,12 @@ let express = require('express');
 let app = express();
 let http = require('http').Server(app);
 let bodyParser = require('body-parser');
+let fs = require('fs');
 let path = require('path');
 
 //utilities
 let { log } = require('../common/utilities.js');
+let { replacement, stringReplacement } = require('../common/replacement.js');
 
 app.use(bodyParser.json());
 
@@ -90,9 +92,12 @@ app.get('/app.bundle.js.map', (req, res) => {
 	res.sendFile(path.resolve(__dirname + `/../public/${req.originalUrl}`));
 });
 
-//fallback
+//fallback to index.html template (with randomization)
+const indexTemplate = fs.readFileSync(path.resolve(__dirname + '/../public/index.html.t'), 'utf8');
+const replacementEngine = replacement(require('./website_descriptions.json'));
+
 app.get('*', (req, res) => {
-	res.sendFile(path.resolve(__dirname + '/../public/index.html'));
+	res.send(stringReplacement(indexTemplate, replacementEngine('description') ));
 });
 
 //startup
diff --git a/server/website_descriptions.json b/server/website_descriptions.json
new file mode 100644
index 0000000..62db520
--- /dev/null
+++ b/server/website_descriptions.json
@@ -0,0 +1,6 @@
+{
+	"description": [
+		"Build Your Kingdom!",
+		"These Descriptions Are Random!"
+	]
+}
\ No newline at end of file