Version 5.0.0 beta 2

system/Widget/Area.php

@@ -656,6 +656,21 @@ class Area
 			}
 		}
 
+		/* Make sure that the widget actually exists, otherwise ignore it.
+		This can be an issue if a widget was added and now no longer exists in the system. */
+		try
+		{
+			if( !Widget::isValidWidget( Application::load( $block['app'] ), $block['key'] ) )
+			{
+				return $this;
+			}
+		}
+		catch( Exception )
+		{
+			return $this;
+		}
+
+
 		/* Load configuration */
 		if ( empty( $block['configuration'] ) or !is_array( $block['configuration'] ) )
 		{

system/Widget/Polymorphic.php

@@ -0,0 +1,34 @@
+<?php
+
+/**
+ * @brief        Polymorphic
+ * @author        <a href='https://www.invisioncommunity.com'>Invision Power Services, Inc.</a>
+ * @copyright    (c) Invision Power Services, Inc.
+ * @license        https://www.invisioncommunity.com/legal/standards/
+ * @package        Invision Community
+ * @subpackage
+ * @since        Oct 2024
+ */
+
+namespace IPS\Widget;
+
+/* To prevent PHP errors (extending class does not exist) revealing path */
+
+use function defined;
+use function header;
+
+if ( !defined( '\IPS\SUITE_UNIQUE_KEY' ) )
+{
+	header( ( $_SERVER['SERVER_PROTOCOL'] ?? 'HTTP/1.0' ) . ' 403 Forbidden' );
+	exit;
+}
+
+interface Polymorphic
+{
+	/**
+	 * Get the base key. When the class name is dynamically generated, we need to use the base key to look in the database and find the actual base configuration
+	 *
+	 * @return string
+	 */
+	public static function getBaseKey() : string;
+}

system/Widget/Widget.php

@@ -494,7 +494,7 @@ abstract class Widget
 	 */
 	public function getSupportedLayouts() : array
 	{
-		if ( !isset( static::$baseWidgetConfig[ $this::class ]['layouts'] ) OR empty( static::$baseWidgetConfig[ $this::class ]['layouts'] ) )
+		if ( !isset( static::$baseWidgetConfig[ $this::class ]['layouts'] ) OR !is_array( static::$baseWidgetConfig[ $this::class ]['layouts'] ) )
 		{
 			$layouts = ['table'];
 			if ( $this->isCustomizableWidget() )
@@ -718,6 +718,17 @@ abstract class Widget
 		}
 
 		$class = '\IPS\\' . $parent->directory . '\widgets\\' . $widgetKey;
+		$baseWidgetKey = $widgetKey;
+		if ( class_exists( $class ) and in_array( "IPS\\Widget\\Polymorphic", class_implements( $class ) ) )
+		{
+			$baseWidgetKey = $class::getBaseKey();
+		}
+
+		/* Is this a valid widget? */
+		if( !static::isValidWidget( $parent, $baseWidgetKey ) )
+		{
+			throw new OutOfRangeException;
+		}
 		
 		/* Return */
 		if ( class_exists( $class ) )
@@ -732,6 +743,37 @@ abstract class Widget
 		
 		throw new OutOfRangeException;
 	}
+
+	/**
+	 * Make sure that the widget actually is supported by the app
+	 *
+	 * @param Application|string $app
+	 * @param string $widgetKey
+	 * @return bool
+	 */
+	public static function isValidWidget( Application|string $app, string $widgetKey ) : bool
+	{
+		/* Is this a valid widget? */
+		try
+		{
+			$cache = Store::i()->widgets;
+		}
+		catch( OutOfRangeException )
+		{
+			static::appDefaults( $app );
+			$cache = Store::i()->widgets;
+		}
+
+		$app = ( $app instanceof Application ) ? $app->directory : $app;
+
+		$class = '\IPS\\' . $app . '\widgets\\' . $widgetKey;
+		if ( class_exists( $class ) and in_array( "IPS\\Widget\\Polymorphic", class_implements( $class ) ) )
+		{
+			$widgetKey = $class::getBaseKey();
+		}
+
+		return array_key_exists( $widgetKey, $cache[ $app ] );
+	}
 	
 	/**
 	 * Widget Types
@@ -1183,11 +1225,12 @@ abstract class Widget
 	/**
 	 * Get default widgets for an application
 	 *
-	 * @param Application $app	The application
+	 * @param Application|string $app	The application
 	 * @return	array
 	 */
-	public static function appDefaults( Application $app ): array
+	public static function appDefaults( Application|string $app ): array
 	{
+		$app = is_string( $app ) ? Application::load( $app ) : $app;
 		if ( !isset( Store::i()->widgets ) )
 		{
 			$widgets = array();