#372 - Implement Joomla url rewriter

code/site/components/com_pages/event/subscriber/urlrewriter.php

@@ -0,0 +1,112 @@
+<?php
+/**
+ * Joomlatools Pages
+ *
+ * @copyright   Copyright (C) 2018 Johan Janssens and Timble CVBA. (http://www.timble.net)
+ * @license     GNU GPLv3 <http://www.gnu.org/licenses/gpl.html>
+ * @link        https://github.com/joomlatools/joomlatools-pages for the canonical source repository
+ */
+
+class ComPagesEventSubscriberUrlrewriter extends ComPagesEventSubscriberAbstract
+{
+    private $__routes  = array();
+
+    protected function _initialize(KObjectConfig $config)
+    {
+        $config->append(array(
+            'priority'   => KEvent::PRIORITY_HIGH,
+            'cache_path' => $this->getObject('com://site/pages.config')->getSitePath('cache'),
+        ));
+
+        parent::_initialize($config);
+    }
+
+    public function onAfterApplicationInitialise(KEventInterface $event)
+    {
+        //Load the routes
+        $path = $this->getConfig()->cache_path;
+        $file = $path.'/rewrites.php';
+
+        if(file_exists($file)) {
+            $this->__routes = require($file);
+        }
+
+        //Attach build rule
+        JFactory::getApplication()->getRouter()->attachBuildRule(function($router, $url)
+        {
+            $path  = trim(str_replace(array('index.php'), '', $url->getPath()), '/');
+            $query = $url->getQuery(true);
+
+            $request = $this->getObject('request');
+            $router  = $this->getObject('com://site/pages.dispatcher.router.url', ['request' => $request]);
+
+            //Internal rewrite from old to new url
+            if($route = $router->resolve($path, $query))
+            {
+                $target = trim($route->getPath(), '/');
+
+                if(strpos($router->getRequest()->getUrl()->getPath(), 'index.php') !== false) {
+                    $url->setPath('index.php/' . $target);
+                } else {
+                    $url->setPath($target);
+                }
+
+                $url->setQuery($route->getQuery(true));
+
+                //Cache the route resolution
+                $this->__routes[$path] = $target;
+            }
+
+        },  JRouter::PROCESS_AFTER);
+
+        //Attach parse rule
+        JFactory::getApplication()->getRouter()->attachParseRule(function($router, $url)
+        {
+            $path  = trim(str_replace(array('index.php'), '', $url->getPath()), '/');
+            $query = $url->getQuery(true);
+
+            $request = $this->getObject('request');
+            $router  = $this->getObject('com://site/pages.dispatcher.router.url', ['request' => $request]);
+
+            if(isset($this->__routes[$path]))
+            {
+                //Redirect OLD to NEW
+                if($route = $router->resolve($path, $query))
+                {
+                    $route = $router->getRoute(trim($route->getPath(), '/'));
+                    $url   = $router->qualify($route);
+
+                    $this->getObject('com://site/pages.dispatcher.http')->redirect($url);
+                }
+            }
+
+            if($old = array_search($path, $this->__routes))
+            {
+                //Redirect NEW to OLD
+                if(!$router->resolve($old, $query))
+                {
+                    $route = $router->getRoute($old);
+                    $url   = $router->qualify($route);
+
+                    $this->getObject('com://site/pages.dispatcher.http')->redirect($url);
+                }
+                else $url->setPath($old);
+            }
+
+        },  JRouter::PROCESS_BEFORE);
+    }
+
+    public function onBeforeApplicationTerminate(KEventInterface $event)
+    {
+        //Store the routes
+        $path = $this->getConfig()->cache_path;
+        $file = $path.'/rewrites.php';
+
+        $result = '<?php /*//path:'.$file.'*/'."\n";
+        $result .= 'return '.var_export($this->__routes, true).';';
+
+        if(@file_put_contents($file, $result) === false) {
+            throw new RuntimeException(sprintf('The routes cannot be cached in "%s"', $file));
+        }
+    }
+}