NEW: Add an extension that provides the <page-url>/widget/<widget-id> URL as part of the widgets module. (Trac #7174)

The handleWidget() method used to be part of core, and it's now been turned into the extension included here.

_config/contentcontroller-url-handler.yml

@@ -0,0 +1,8 @@
+---
+Name: contentcontroller-url-handler
+---
+ContentController:
+  extensions:
+    - WidgetContentControllerExtension
+  url_handlers:
+    'widget/$ID!': 'handleWidget'

code/controller/WigetContentControllerExtension.php

@@ -0,0 +1,57 @@
+<?php
+
+/**
+ * Add this to ContentController to enable widgets
+ */
+class WidgetContentControllerExtension extends Extension {
+	static $allowed_actions = array(
+		'handleWidget'
+	);
+	
+	/**
+	 * Handles widgets attached to a page through one or more {@link WidgetArea} elements.
+	 * Iterated through each $has_one relation with a {@link WidgetArea}
+	 * and looks for connected widgets by their database identifier.
+	 * Assumes URLs in the following format: <URLSegment>/widget/<Widget-ID>.
+	 * 
+	 * @return RequestHandler
+	 */
+	function handleWidget() {
+		$SQL_id = $this->owner->getRequest()->param('ID');
+		if(!$SQL_id) return false;
+		
+		// find WidgetArea relations
+		$widgetAreaRelations = array();
+		$hasOnes = $this->owner->data()->has_one();
+		if(!$hasOnes) return false;
+		foreach($hasOnes as $hasOneName => $hasOneClass) {
+			if($hasOneClass == 'WidgetArea' || is_subclass_of($hasOneClass, 'WidgetArea')) {
+				$widgetAreaRelations[] = $hasOneName;
+			}
+		}
+
+		// find widget
+		$widget = null;
+		foreach($widgetAreaRelations as $widgetAreaRelation) {
+			if($widget) break;
+			$widget = $this->owner->data()->$widgetAreaRelation()->Widgets(
+				sprintf('"Widget"."ID" = %d', $SQL_id)
+			)->First();
+		}
+		if(!$widget) user_error('No widget found', E_USER_ERROR);
+		
+		// find controller
+		$controllerClass = '';
+		foreach(array_reverse(ClassInfo::ancestry($widget->class)) as $widgetClass) {
+			$controllerClass = "{$widgetClass}_Controller";
+			if(class_exists($controllerClass)) break;
+		}
+		if(!$controllerClass) user_error(
+			sprintf('No controller available for %s', $widget->class),
+			E_USER_ERROR
+		);
+
+		return new $controllerClass($widget);
+	}
+
+}