From 6c40c6da461294aad6d789154b6342734e0b502e Mon Sep 17 00:00:00 2001
From: Andrew Dolgov <noreply@fakecake.org>
Date: Thu, 7 May 2020 09:50:27 +0300
Subject: check file modification times for local syncing instead of relying on
 a sync interval

---
 index.php | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
 js/app.js | 14 ++++++++------
 2 files changed, 56 insertions(+), 6 deletions(-)

diff --git a/index.php b/index.php
index 76d895a..cd36791 100644
--- a/index.php
+++ b/index.php
@@ -42,6 +42,53 @@
 		die(dirname(SCRATCH_DB) . " directory is not writable");
 	}
 
+    // TODO: this should be unified with the service worker cache list
+    $check_files_mtime = [
+        'manifest.json',
+        'worker.js',
+        'img/ic_launcher_web.png?v4',
+        'img/favicon.png',
+        'read.html',
+        'js/app.js',
+        'js/reader.js',
+        'js/reader_iframe.js',
+        'js/dict.js',
+        'css/read.css',
+        'css/reader.css',
+        'css/index.css',
+        'css/transitions.css',
+        'offline.html',
+        'themes/default.css',
+        'themes/light.css',
+        'themes/mocca.css',
+        'themes/night.css',
+        'themes/plan9.css',
+        'themes/gray.css',
+        'themes/sepia.css',
+        'lib/promise.js',
+        'lib/fetch.js',
+        'lib/zip.min.js',
+        'lib/epub.js',
+        'lib/localforage.min.js',
+        'lib/jquery.mobile-events.min.js',
+        'lib/holder.min.js',
+        'lib/bootstrap/v3/css/bootstrap-theme.min.css',
+        'lib/bootstrap/v3/css/bootstrap.min.css',
+        'lib/bootstrap/v3/css/theme-dark.min.css',
+        'lib/bootstrap/v3/js/jquery.js',
+        'lib/bootstrap/v3/js/bootstrap.min.js',
+        'lib/bootstrap/v3/fonts/glyphicons-halflings-regular.woff2',
+        'lib/fonts/pmn-caecilia-55.ttf',
+        'lib/fonts/pmn-caecilia-56.ttf',
+        'lib/fonts/pmn-caecilia-75.ttf'
+    ];
+
+	$last_mtime = array_reduce(
+	            array_map("filemtime", $check_files_mtime),
+                function ($carry, $item) {
+                       return $item > $carry ? $item : $carry;
+               }, 0);
+
 	@$mode = htmlspecialchars($_REQUEST["mode"]);
 
 	$ldb = Db::get();
@@ -76,6 +123,7 @@
 
                     $(document).ready(function() {
                         App.index_mode = "<?php echo $mode ?>";
+                        App.last_mtime = parseInt("<?php echo $last_mtime ?>");
                         App.init();
                     });
                 });
diff --git a/js/app.js b/js/app.js
index 74c2fca..33333e8 100644
--- a/js/app.js
+++ b/js/app.js
@@ -37,6 +37,7 @@ const Cookie = {
 const App = {
     _dl_progress_timeout: false,
     index_mode: "",
+    last_mtime: -1,
     init: function() {
         let refreshed_files = 0;
 
@@ -74,8 +75,7 @@ const App = {
                 }
 
                 if (event.data == 'client-reload') {
-                    const ts = parseInt(new Date().getTime()/1000);
-                    localforage.setItem("epube.cache-timestamp", ts);
+                    localforage.setItem("epube.cache-timestamp", App.last_mtime);
                     window.location.reload()
                 }
 
@@ -156,9 +156,7 @@ const App = {
     refreshCache: function(force) {
         if ('serviceWorker' in navigator) {
             localforage.getItem("epube.cache-timestamp").then(function(stamp) {
-                const ts = parseInt(new Date().getTime()/1000);
-
-                if (force || !stamp || ts - stamp > 3600 * 24 * 7) {
+                if (force || stamp != App.last_mtime) {
                     console.log('asking worker to refresh cache');
 
                     if (navigator.serviceWorker.controller) {
@@ -190,8 +188,12 @@ const App = {
                         });
                     }
                 }
-
             });
+        } else {
+            $(".dl-progress")
+                .show()
+                .addClass("alert-danger")
+                .html("Could not communicate with service worker. Try reloading the page.");
         }
     },
     initOfflineEvents: function() {
-- 
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