Introducing a $_REQUEST/POST/GET wrapper

This new wrapper ensures types are correct and accessed parameters are
actually set (with custom default fallbacks).

The wrapper is available in the global $INPUT variable. It accesses
$_REQUEST by default. If POST or GET is required, the post and get
members can be used:

$INPUT->int('foo',false); // access $_REQUEST['foo'], default false
$INPUT->post->int('foo'); // access $_POST['foo'], default 0
$INPUT->get->int('foo'); // access $_GET['foo'], default 0

The codebase still needs to be updated to make use of this.

inc/Input.class.php

@@ -0,0 +1,147 @@
+<?php
+
+/**
+ * Encapsulates access to the $_REQUEST array, making sure used parameters are initialized and
+ * have the correct type.
+ *
+ * All function access the $_REQUEST array by default, if you want to access $_POST or $_GET
+ * explicitly use the $post and $get members.
+ *
+ * @author Andreas Gohr <andi@splitbrain.org>
+ */
+class Input {
+
+    /** @var PostInput Access $_POST parameters */
+    public $post;
+    /** @var GetInput Access $_GET parameters */
+    public $get;
+
+    protected $access;
+
+    /**
+     * Intilizes the Input class and it subcomponents
+     */
+    function __construct() {
+        $this->access = &$_REQUEST;
+        $this->post   = new PostInput();
+        $this->get    = new GetInput();
+    }
+
+    /**
+     * Access a request parameter without any type conversion
+     *
+     * @param string    $name     Parameter name
+     * @param mixed     $default  Default to return if parameter isn't set
+     * @return mixed
+     */
+    public function param($name, $default = null) {
+        if(!isset($this->access[$name])) return $default;
+        return $this->access[$name];
+    }
+
+    /**
+     * Get a reference to a request parameter
+     *
+     * This avoids copying data in memory, when the parameter is not set it will be created
+     * and intialized with the given $default value before a reference is returned
+     *
+     * @param string  $name Parameter name
+     * @param mixed   $default Initialize parameter with if not set
+     * @return &mixed
+     */
+    public function &ref($name, $default = '') {
+        if(!isset($this->access[$name])) {
+            $this->access[$name] = $default;
+        }
+
+        $ref = &$this->access[$name];
+        return $ref;
+    }
+
+    /**
+     * Access a request parameter as int
+     *
+     * @param string    $name     Parameter name
+     * @param mixed     $default  Default to return if parameter isn't set or is an array
+     * @return int
+     */
+    public function int($name, $default = 0) {
+        if(!isset($this->access[$name])) return $default;
+        if(is_array($this->access[$name])) return $default;
+
+        return (int) $this->access[$name];
+    }
+
+    /**
+     * Access a request parameter as string
+     *
+     * @param string    $name     Parameter name
+     * @param mixed     $default  Default to return if parameter isn't set or is an array
+     * @return string
+     */
+    public function str($name, $default = '') {
+        if(!isset($this->access[$name])) return $default;
+        if(is_array($this->access[$name])) return $default;
+
+        return (string) $this->access[$name];
+    }
+
+    /**
+     * Access a request parameter as bool
+     *
+     * @param string    $name     Parameter name
+     * @param mixed     $default  Default to return if parameter isn't set
+     * @return bool
+     */
+    public function bool($name, $default = '') {
+        if(!isset($this->access[$name])) return $default;
+
+        return (bool) $this->access[$name];
+    }
+
+    /**
+     * Access a request parameter as array
+     *
+     * @param string    $name     Parameter name
+     * @param mixed     $default  Default to return if parameter isn't set
+     * @return array
+     */
+    public function arr($name, $default = array()) {
+        if(!isset($this->access[$name])) return $default;
+
+        return (array) $this->access[$name];
+    }
+
+}
+
+/**
+ * Internal class used for $_POST access in Input class
+ */
+class PostInput extends Input {
+    protected $access;
+
+    /**
+     * Initialize the $access array, remove subclass members
+     */
+    function __construct() {
+        $this->access = &$_POST;
+        unset ($this->post);
+        unset ($this->get);
+    }
+}
+
+/**
+ * Internal class used for $_GET access in Input class
+ */
+class GetInput extends Input {
+    protected $access;
+
+    /**
+     * Initialize the $access array, remove subclass members
+     */
+    function __construct() {
+        $this->access = &$_GET;
+        unset ($this->post);
+        unset ($this->get);
+    }
+}

inc/init.php

@@ -197,6 +197,10 @@ function_exists('ob_gzhandler')) {
 // load libraries
 require_once(DOKU_INC.'inc/load.php');
 
+// input handle class
+global $INPUT;
+$INPUT = new Input();
+
 // initialize plugin controller
 $plugin_controller = new $plugin_controller_class();
 

inc/load.php

@@ -62,6 +62,7 @@ function load_autoload($name){
         'Doku_Event'            => DOKU_INC.'inc/events.php',
         'Doku_Event_Handler'    => DOKU_INC.'inc/events.php',
         'EmailAddressValidator' => DOKU_INC.'inc/EmailAddressValidator.php',
+        'Input'                 => DOKU_INC.'inc/Input.class.php',
         'JpegMeta'              => DOKU_INC.'inc/JpegMeta.php',
         'SimplePie'             => DOKU_INC.'inc/SimplePie.php',
         'FeedParser'            => DOKU_INC.'inc/FeedParser.php',