implemented alt_folder and reorganized interface class code

interfaces/contentcontroller.interface.php

@@ -0,0 +1,37 @@
+<?php
+
+/**
+ * Content controller interface for new content types
+ */
+
+interface ContentController
+{
+    /** This method will return all file extensions that will be associated with this content type
+     *  for example 'pdf' but it could be anything really. You just need a way later to confirm that a type is what it says it is
+     * 
+     * 
+     * @return array the extensions of files associated with this controller. eg. return array('pdf');
+    */
+    public function getRegisteredExtensions();
+
+    /** This method will be called whenever the system has to find out if a user requested (existing) hash
+     * belongs to this controller.
+     * In here the content should be rendered or processed like resized or something.
+     * You can decide what it does by working with the $url array which gives you every element in the URL
+     * Does not need to return anything for example you can just set the header and print your data right away
+     * 
+     * @param string $hash the hash (with extension eg '5saB2.pdf') of the file this controller will work with
+     * @param array $url contains all URL elements exploded with '/' so you can do your magic. 
+    */
+    public function handleHash($hash,$url);
+
+    /** This method will be called if the upload script detects the content of a newly uploaded file as one of the
+     *  extensions registered at "getRegisteredExtensions".
+     *  For Example if someone uploads a PDF and getRegisteredExtensions has registered "pdf", then this method of this
+     *  controller will be called
+     * 
+     * @param string $tmpfile is the location on disk of the temp file that was uploaded. It is your job to put it somewhere, your handleHash method will find it again
+     * @param array $hash (optional) if you want your upload to have a certain hash then add it here. This allows for user chosen hashes
+    */
+    public function handleUpload($tmpfile,$hash=false);
+}