335 lines
10 KiB
PHP
335 lines
10 KiB
PHP
<?php
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/**
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* Encapsulates access to the $_REQUEST array, making sure used parameters are initialized and
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* have the correct type.
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*
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* All function access the $_REQUEST array by default, if you want to access $_POST or $_GET
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* explicitly use the $post and $get members.
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*
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* @author Andreas Gohr <andi@splitbrain.org>
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*/
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class Input {
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/** @var PostInput Access $_POST parameters */
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public $post;
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/** @var GetInput Access $_GET parameters */
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public $get;
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/** @var ServerInput Access $_SERVER parameters */
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public $server;
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protected $access;
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/**
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* @var Callable
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*/
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protected $filter;
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/**
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* Intilizes the Input class and it subcomponents
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*/
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function __construct() {
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$this->access = &$_REQUEST;
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$this->post = new PostInput();
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$this->get = new GetInput();
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$this->server = new ServerInput();
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}
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/**
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* Apply the set filter to the given value
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*
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* @param string $data
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* @return string
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*/
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protected function applyfilter($data){
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if(!$this->filter) return $data;
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return call_user_func($this->filter, $data);
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}
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/**
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* Return a filtered copy of the input object
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*
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* Expects a callable that accepts one string parameter and returns a filtered string
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*
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* @param Callable|string $filter
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* @return Input
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*/
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public function filter($filter='stripctl'){
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$this->filter = $filter;
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$clone = clone $this;
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$this->filter = '';
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return $clone;
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}
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/**
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* Check if a parameter was set
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*
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* Basically a wrapper around isset. When called on the $post and $get subclasses,
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* the parameter is set to $_POST or $_GET and to $_REQUEST
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*
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* @see isset
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* @param string $name Parameter name
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* @return bool
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*/
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public function has($name) {
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return isset($this->access[$name]);
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}
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/**
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* Remove a parameter from the superglobals
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*
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* Basically a wrapper around unset. When NOT called on the $post and $get subclasses,
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* the parameter will also be removed from $_POST or $_GET
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*
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* @see isset
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* @param string $name Parameter name
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*/
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public function remove($name) {
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if(isset($this->access[$name])) {
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unset($this->access[$name]);
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}
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// also remove from sub classes
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if(isset($this->post) && isset($_POST[$name])) {
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unset($_POST[$name]);
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}
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if(isset($this->get) && isset($_GET[$name])) {
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unset($_GET[$name]);
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}
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}
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/**
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* Access a request parameter without any type conversion
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*
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* @param string $name Parameter name
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* @param mixed $default Default to return if parameter isn't set
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* @param bool $nonempty Return $default if parameter is set but empty()
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* @return mixed
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*/
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public function param($name, $default = null, $nonempty = false) {
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if(!isset($this->access[$name])) return $default;
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$value = $this->applyfilter($this->access[$name]);
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if($nonempty && empty($value)) return $default;
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return $value;
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}
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/**
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* Sets a parameter
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*
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* @param string $name Parameter name
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* @param mixed $value Value to set
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*/
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public function set($name, $value) {
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$this->access[$name] = $value;
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}
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/**
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* Get a reference to a request parameter
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*
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* This avoids copying data in memory, when the parameter is not set it will be created
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* and intialized with the given $default value before a reference is returned
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*
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* @param string $name Parameter name
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* @param mixed $default If parameter is not set, initialize with this value
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* @param bool $nonempty Init with $default if parameter is set but empty()
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* @return mixed (reference)
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*/
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public function &ref($name, $default = '', $nonempty = false) {
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if(!isset($this->access[$name]) || ($nonempty && empty($this->access[$name]))) {
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$this->set($name, $default);
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}
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return $this->access[$name];
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}
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/**
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* Access a request parameter as int
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*
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* @param string $name Parameter name
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* @param int $default Default to return if parameter isn't set or is an array
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* @param bool $nonempty Return $default if parameter is set but empty()
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* @return int
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*/
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public function int($name, $default = 0, $nonempty = false) {
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if(!isset($this->access[$name])) return $default;
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if(is_array($this->access[$name])) return $default;
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$value = $this->applyfilter($this->access[$name]);
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if($value === '') return $default;
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if($nonempty && empty($value)) return $default;
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return (int) $value;
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}
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/**
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* Access a request parameter as string
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*
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* @param string $name Parameter name
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* @param string $default Default to return if parameter isn't set or is an array
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* @param bool $nonempty Return $default if parameter is set but empty()
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* @return string
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*/
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public function str($name, $default = '', $nonempty = false) {
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if(!isset($this->access[$name])) return $default;
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if(is_array($this->access[$name])) return $default;
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$value = $this->applyfilter($this->access[$name]);
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if($nonempty && empty($value)) return $default;
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return (string) $value;
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}
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/**
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* Access a request parameter and make sure it is has a valid value
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*
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* Please note that comparisons to the valid values are not done typesafe (request vars
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* are always strings) however the function will return the correct type from the $valids
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* array when an match was found.
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*
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* @param string $name Parameter name
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* @param array $valids Array of valid values
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* @param mixed $default Default to return if parameter isn't set or not valid
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* @return null|mixed
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*/
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public function valid($name, $valids, $default = null) {
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if(!isset($this->access[$name])) return $default;
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if(is_array($this->access[$name])) return $default; // we don't allow arrays
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$value = $this->applyfilter($this->access[$name]);
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$found = array_search($value, $valids);
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if($found !== false) return $valids[$found]; // return the valid value for type safety
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return $default;
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}
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/**
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* Access a request parameter as bool
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*
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* Note: $nonempty is here for interface consistency and makes not much sense for booleans
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*
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* @param string $name Parameter name
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* @param mixed $default Default to return if parameter isn't set
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* @param bool $nonempty Return $default if parameter is set but empty()
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* @return bool
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*/
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public function bool($name, $default = false, $nonempty = false) {
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if(!isset($this->access[$name])) return $default;
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if(is_array($this->access[$name])) return $default;
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$value = $this->applyfilter($this->access[$name]);
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if($value === '') return $default;
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if($nonempty && empty($value)) return $default;
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return (bool) $value;
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}
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/**
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* Access a request parameter as array
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*
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* @param string $name Parameter name
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* @param mixed $default Default to return if parameter isn't set
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* @param bool $nonempty Return $default if parameter is set but empty()
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* @return array
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*/
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public function arr($name, $default = array(), $nonempty = false) {
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if(!isset($this->access[$name])) return $default;
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if(!is_array($this->access[$name])) return $default;
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if($nonempty && empty($this->access[$name])) return $default;
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return (array) $this->access[$name];
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}
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/**
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* Create a simple key from an array key
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*
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* This is useful to access keys where the information is given as an array key or as a single array value.
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* For example when the information was submitted as the name of a submit button.
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*
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* This function directly changes the access array.
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*
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* Eg. $_REQUEST['do']['save']='Speichern' becomes $_REQUEST['do'] = 'save'
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*
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* This function returns the $INPUT object itself for easy chaining
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*
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* @param string $name
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* @return Input
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*/
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public function extract($name){
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if(!isset($this->access[$name])) return $this;
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if(!is_array($this->access[$name])) return $this;
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$keys = array_keys($this->access[$name]);
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if(!$keys){
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// this was an empty array
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$this->remove($name);
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return $this;
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}
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// get the first key
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$value = array_shift($keys);
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if($value === 0){
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// we had a numeric array, assume the value is not in the key
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$value = array_shift($this->access[$name]);
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}
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$this->set($name, $value);
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return $this;
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}
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}
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/**
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* Internal class used for $_POST access in Input class
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*/
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class PostInput extends Input {
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protected $access;
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/**
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* Initialize the $access array, remove subclass members
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*/
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function __construct() {
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$this->access = &$_POST;
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}
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/**
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* Sets a parameter in $_POST and $_REQUEST
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*
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* @param string $name Parameter name
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* @param mixed $value Value to set
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*/
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public function set($name, $value) {
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parent::set($name, $value);
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$_REQUEST[$name] = $value;
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}
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}
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/**
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* Internal class used for $_GET access in Input class
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*/
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class GetInput extends Input {
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protected $access;
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/**
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* Initialize the $access array, remove subclass members
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*/
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function __construct() {
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$this->access = &$_GET;
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}
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/**
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* Sets a parameter in $_GET and $_REQUEST
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*
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* @param string $name Parameter name
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* @param mixed $value Value to set
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*/
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public function set($name, $value) {
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parent::set($name, $value);
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$_REQUEST[$name] = $value;
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}
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}
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/**
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* Internal class used for $_SERVER access in Input class
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*/
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class ServerInput extends Input {
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protected $access;
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/**
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* Initialize the $access array, remove subclass members
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*/
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function __construct() {
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$this->access = &$_SERVER;
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}
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}
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