From 61c77a344078c54d3a213f9a8dab9dfe7a79d951 Mon Sep 17 00:00:00 2001
From: Aiosa <horakj7@gmail.com>
Date: Sun, 21 Aug 2022 10:09:36 +0200
Subject: [PATCH] Fix hash tile generation by checking the validity of URL
 input parameter and fallback to level, x, y variables.

---
 src/tilesource.js | 11 +++++++----
 src/viewer.js     |  5 -----
 2 files changed, 7 insertions(+), 9 deletions(-)

diff --git a/src/tilesource.js b/src/tilesource.js
index cba91511..2c99db29 100644
--- a/src/tilesource.js
+++ b/src/tilesource.js
@@ -688,11 +688,14 @@ $.TileSource.prototype = {
      * @param {*} postData data the tile was fetched with (type depends on getTilePostData(..) return type)
      */
     getTileHashKey: function(level, x, y, url, ajaxHeaders, postData) {
-        if (ajaxHeaders) {
-            return url + "+" + JSON.stringify(ajaxHeaders);
-        } else {
-            return url;
+        function withHeaders(hash) {
+            return ajaxHeaders ? hash + "+" + JSON.stringify(ajaxHeaders) : hash;
         }
+
+        if (typeof url !== "string") {
+            return withHeaders(level + "/" + x + "_" + y);
+        }
+        return withHeaders(url);
     },
 
     /**
diff --git a/src/viewer.js b/src/viewer.js
index 007f1bf1..df553e4c 100644
--- a/src/viewer.js
+++ b/src/viewer.js
@@ -1398,11 +1398,6 @@ $.extend( $.Viewer.prototype, $.EventSource.prototype, $.ControlDock.prototype,
             options.ajaxHeaders = $.extend({}, this.ajaxHeaders, options.ajaxHeaders);
         }
 
-        if (!$.isFunction(options.tileSource.getTileHashKey)) {
-            //silently add custom implementation
-            options.tileSource.getTileHashKey = $.TileSource.prototype.getTileHashKey;
-        }
-
         var myQueueItem = {
             options: options
         };