core: Implement action factory (#1002)

actions/DetectAction.php

@@ -0,0 +1,50 @@
+<?php
+/**
+ * This file is part of RSS-Bridge, a PHP project capable of generating RSS and
+ * Atom feeds for websites that don't have one.
+ *
+ * For the full license information, please view the UNLICENSE file distributed
+ * with this source code.
+ *
+ * @package	Core
+ * @license	http://unlicense.org/ UNLICENSE
+ * @link	https://github.com/rss-bridge/rss-bridge
+ */
+
+class DetectAction extends ActionAbstract {
+	public function execute() {
+		$targetURL = $this->userData['url']
+			or returnClientError('You must specify a url!');
+
+		$format = $this->userData['format']
+			or returnClientError('You must specify a format!');
+
+		foreach(Bridge::getBridgeNames() as $bridgeName) {
+
+			if(!Bridge::isWhitelisted($bridgeName)) {
+				continue;
+			}
+
+			$bridge = Bridge::create($bridgeName);
+
+			if($bridge === false) {
+				continue;
+			}
+
+			$bridgeParams = $bridge->detectParameters($targetURL);
+
+			if(is_null($bridgeParams)) {
+				continue;
+			}
+
+			$bridgeParams['bridge'] = $bridgeName;
+			$bridgeParams['format'] = $format;
+
+			header('Location: ?action=display&' . http_build_query($bridgeParams), true, 301);
+			die();
+
+		}
+
+		returnClientError('No bridge found for given URL: ' . $targetURL);
+	}
+}