From 63337ba4f8c4f31b7da96e9c3669fc29e0a03b49 Mon Sep 17 00:00:00 2001
From: David Vazgenovich Shakaryan <dvshakaryan@gmail.com>
Date: Fri, 13 May 2022 03:29:49 -0700
Subject: web: disable back button when installed as a PWA

---
 web/static/dartboat.js | 13 +++++++++++++
 web/static/sw.js       |  2 +-
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/web/static/dartboat.js b/web/static/dartboat.js
index 39e0371..6051b7e 100644
--- a/web/static/dartboat.js
+++ b/web/static/dartboat.js
@@ -197,3 +197,16 @@ document.addEventListener('keydown', e => {
 
 if ('serviceWorker' in navigator)
 	navigator.serviceWorker.register('sw.js');
+
+// disable back button when installed as a PWA. a single click exits the app,
+// destroying match state without confirmation, so we must resort to this.
+if (window.matchMedia('(display-mode: standalone)').matches) {
+	window.addEventListener('load', () => {
+		if (!history.state) {
+			history.replaceState(true, '');
+			history.pushState(true, '');
+		}
+	});
+
+	window.addEventListener('popstate', () => history.pushState(true, ''));
+}
diff --git a/web/static/sw.js b/web/static/sw.js
index 7ed7a85..f5d699a 100644
--- a/web/static/sw.js
+++ b/web/static/sw.js
@@ -1,5 +1,5 @@
 const CACHE_PREFIX = 'dartboat-'
-const CACHE_VERSION = '2';
+const CACHE_VERSION = '3';
 const CACHE_NAME = `${CACHE_PREFIX}${CACHE_VERSION}`;
 
 const FILES = [
-- 
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