[pve-devel] [PATCH widget-toolkit 3/3] window: edit: avoid shared object for extra request params

[Friedrich Weber <f.weber@proxmox.com>]

Currently, `Proxmox.window.Edit` initializes `extraRequestParams` to
an object that, if not overwritten, is shared between all instances of
subclasses. This bears the danger of modifying the shared object in a
subclass instead of overwriting it, which affects all edit windows of
the current session and can cause hard-to-catch UI bugs [1].

To avoid such bugs in the future, initialize `extraRequestParams` to
`undefined` instead, which forces subclasses to initialize their own
objects.

Note that bugs of the same kind can still happen if a subclass
initializes `extraRequestParams` to an empty shared object and
inadvertently modifies it, but at least they will be limited to that
particular subclass.

[1] https://lists.proxmox.com/pipermail/pve-devel/2024-March/062179.html

Signed-off-by: Friedrich Weber <f.weber@proxmox.com>
---

Notes:
    With patch 2/3 applied, I think all occurrences of
    `extraRequestParams` in PVE/PBS create their own object (PMG does not
    seem to use `extraRequestParams`), so this patch should not break
    anything, and if it does, it should be quite noticeable.
    
    new in v2

 src/window/Edit.js | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/src/window/Edit.js b/src/window/Edit.js
index d4a2b551..27cd8d01 100644
--- a/src/window/Edit.js
+++ b/src/window/Edit.js
@@ -9,7 +9,7 @@ Ext.define('Proxmox.window.Edit', {
 
     // to submit extra params on load and submit, useful, e.g., if not all ID
     // parameters are included in the URL
-    extraRequestParams: {},
+    extraRequestParams: undefined,
 
     resizable: false,
 
@@ -80,7 +80,9 @@ Ext.define('Proxmox.window.Edit', {
 	let me = this;
 
 	let values = {};
-	Ext.apply(values, me.extraRequestParams);
+	if (me.extraRequestParams) {
+	    Ext.apply(values, me.extraRequestParams);
+	}
 
 	let form = me.formPanel.getForm();
 
@@ -209,7 +211,7 @@ Ext.define('Proxmox.window.Edit', {
 	    waitMsgTarget: me,
 	}, options);
 
-	if (Object.keys(me.extraRequestParams).length > 0) {
+	if (me.extraRequestParams && Object.keys(me.extraRequestParams).length > 0) {
 	    let params = newopts.params || {};
 	    Ext.applyIf(params, me.extraRequestParams);
 	    newopts.params = params;
-- 
2.39.2