Allow updating Landing Banner text remotely

Author: drojf

README.md

@@ -6,6 +6,22 @@ This repository contains the mod installer, used for installing all 07th-mod mod
 
 **The below information is for developers only.**
 
+## Common Installer tasks HOWTO
+
+### Updating landing page and mod page "update" banners
+
+The HTML for the landing page and update banners for each mod is dynamically fetched from this github repo [https://github.com/07th-mod/python-patcher-updates](https://github.com/07th-mod/python-patcher-updates).
+
+To update the html:
+
+ - Edit and save the appropriate HTML file
+ - Push the commit to the repo
+ - Wait for the release to be published automatically (normally takes 15-30 seconds)
+
+Currently only the landing page and Hou+ implement this updateable html function.
+
+More detail is available in the `Readme.md` page on that repo.
+
 ## Python Development Environment Setup
 
 If you have no preference for IDE, I would recommend `Pycharm` as it will help reduce mistakes while you're writing your code. Please conform to the follwing guidelines:

httpGUI.py

@@ -920,6 +920,7 @@ def getSubModHandlesRequestHandler(requestData):
 							'lastSubModID': self.lastSubModID, # The ID of the last submod installed to - only valid if an install is currently running.
 							'donationMonthsRemaining': self.donationMonthsRemaining, # How many months the server can be paid for with current funding
 							'donationProgressPercent': self.donationProgressPercent, # How close funding is to the 12 month donation goal, in percent
+							'landingBannerHTML': self.getUpdate('Landing Banner'), # HTML for the index page landing banner
 							},
 						}
 

httpGUI/index.html

@@ -63,9 +63,7 @@ <h3>Error while checking if installer is latest</h3>
 					<div class="container">
 						<div class="row">
 							<div class="col-md-6">
-								<h2 class="uppercase mb8">Higurashi Hou Plus</h2>
-								<p class="lead mb0">New chapter: Higurashi Hou Plus<br></p>
-								<a class="btn btn-lg" onclick="setModNameAndNavigate('Hou Plus')">INSTALL</a>
+								<span class="rendered-markdown" v-html="renderHTML(metaInfo.landingBannerHTML)"></span>
 							</div>
 						</div>
 

httpGUI/python-patcher-index.js

@@ -126,7 +126,10 @@ window.onload = function onWindowLoaded() {
       getLogsZip(subModToInstall, installPath) {
         // Calls the function with same name in python-patcher-rest-lib.js
         getLogsZip(subModToInstall, installPath);
-      }
+      },
+      renderHTML(htmlText) {
+        return DOMPurify.sanitize(htmlText);
+      },
     },
     computed: {
       versionInfoAvailable() {