form: add Proxmox.form.field.ExpireDate

Behaves like a 'datefield' but treats the 0/empty value as "never",
and sets all defaults for behaving like one would expect from a date
expire field.

This allows to replaces hacks (e.g. [0]) from our various expire date
fields, mostly in PVE/PMG user accounts, and also for the soon to be
applied API token gui.

[0]: https://git.proxmox.com/?p=pve-manager.git;a=blob;f=www/manager6/dc/UserEdit.js;h=40c4044fd9364c9bcb8787507068378ed9936f67;hb=806edfe19f049f07db2628c68e4e5702bbedd9d7#l159

Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>

Makefile

@@ -15,6 +15,7 @@ JSSRC=					\
 	data/ObjectStore.js		\
 	data/RRDStore.js		\
 	data/TimezoneStore.js		\
+	form/ExpireDate.js		\
 	form/IntegerField.js		\
 	form/TextField.js		\
 	form/DateTimeField.js		\

form/ExpireDate.js

@@ -0,0 +1,34 @@
+// treats 0 as "never expires"
+Ext.define('Proxmox.form.field.ExpireDate', {
+    extend: 'Ext.form.field.Date',
+    alias: ['widget.pmxExpireDate'],
+
+    name: 'expire',
+    fieldLabel: gettext('Expire'),
+    emptyText: 'never',
+    format: 'Y-m-d',
+    submitFormat: 'U',
+
+    getSubmitValue: function() {
+	let me = this;
+
+	let value = me.callParent();
+	if (!value) value = 0;
+
+	return value;
+    },
+
+    setValue: function(value) {
+	let me = this;
+
+	if (Ext.isDefined(value)) {
+	    if (!value) {
+		value = null;
+	    } else if (!Ext.isDate(value)) {
+		value = new Date(value * 1000);
+	    }
+	}
+	me.callParent([value]);
+    },
+
+});