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|
<?php
/**
*
* @package phpbb_request
* @copyright (c) 2010 phpBB Group
* @license http://opensource.org/licenses/gpl-2.0.php GNU General Public License v2
*
*/
/**
* @ignore
*/
if (!defined('IN_PHPBB'))
{
exit;
}
/**
* All application input is accessed through this class.
*
* It provides a method to disable access to input data through super globals.
* This should force MOD authors to read about data validation.
*
* @package phpbb_request
*/
class phpbb_request implements phpbb_request_interface
{
/**
* @var array The names of super global variables that this class should protect if super globals are disabled.
*/
protected $super_globals = array(
phpbb_request_interface::POST => '_POST',
phpbb_request_interface::GET => '_GET',
phpbb_request_interface::REQUEST => '_REQUEST',
phpbb_request_interface::COOKIE => '_COOKIE',
phpbb_request_interface::SERVER => '_SERVER',
phpbb_request_interface::FILES => '_FILES',
);
/**
* @var array Stores original contents of $_REQUEST array.
*/
protected $original_request = null;
/**
* @var
*/
protected $super_globals_disabled = false;
/**
* @var array An associative array that has the value of super global constants as keys and holds their data as values.
*/
protected $input;
/**
* @var phpbb_request_type_cast_helper_interface An instance of a type cast helper providing convenience methods for type conversions.
*/
protected $type_cast_helper;
/**
* Initialises the request class, that means it stores all input data in {@link $input input}
* and then calls {@link phpbb_request_deactivated_super_global phpbb_request_deactivated_super_global}
*/
public function __construct(phpbb_request_type_cast_helper_interface $type_cast_helper = null, $disable_super_globals = true)
{
if ($type_cast_helper)
{
$this->type_cast_helper = $type_cast_helper;
}
else
{
$this->type_cast_helper = new phpbb_request_type_cast_helper();
}
foreach ($this->super_globals as $const => $super_global)
{
$this->input[$const] = isset($GLOBALS[$super_global]) ? $GLOBALS[$super_global] : array();
}
// simulate request_order = GP
$this->original_request = $this->input[phpbb_request_interface::REQUEST];
$this->input[phpbb_request_interface::REQUEST] = $this->input[phpbb_request_interface::POST] + $this->input[phpbb_request_interface::GET];
if ($disable_super_globals)
{
$this->disable_super_globals();
}
}
/**
* Getter for $super_globals_disabled
*
* @return bool Whether super globals are disabled or not.
*/
public function super_globals_disabled()
{
return $this->super_globals_disabled;
}
/**
* Disables access of super globals specified in $super_globals.
* This is achieved by overwriting the super globals with instances of {@link phpbb_request_deactivated_super_global phpbb_request_deactivated_super_global}
*/
public function disable_super_globals()
{
if (!$this->super_globals_disabled)
{
foreach ($this->super_globals as $const => $super_global)
{
unset($GLOBALS[$super_global]);
$GLOBALS[$super_global] = new phpbb_request_deactivated_super_global($this, $super_global, $const);
}
$this->super_globals_disabled = true;
}
}
/**
* Enables access of super globals specified in $super_globals if they were disabled by {@link disable_super_globals disable_super_globals}.
* This is achieved by making the super globals point to the data stored within this class in {@link $input input}.
*/
public function enable_super_globals()
{
if ($this->super_globals_disabled)
{
foreach ($this->super_globals as $const => $super_global)
{
$GLOBALS[$super_global] = $this->input[$const];
}
$GLOBALS['_REQUEST'] = $this->original_request;
$this->super_globals_disabled = false;
}
}
/**
* This function allows overwriting or setting a value in one of the super global arrays.
*
* Changes which are performed on the super globals directly will not have any effect on the results of
* other methods this class provides. Using this function should be avoided if possible! It will
* consume twice the the amount of memory of the value
*
* @param string $var_name The name of the variable that shall be overwritten
* @param mixed $value The value which the variable shall contain.
* If this is null the variable will be unset.
* @param phpbb_request_interface::POST|GET|REQUEST|COOKIE $super_global
* Specifies which super global shall be changed
*/
public function overwrite($var_name, $value, $super_global = phpbb_request_interface::REQUEST)
{
if (!isset($this->super_globals[$super_global]))
{
return;
}
$this->type_cast_helper->add_magic_quotes($value);
// setting to null means unsetting
if ($value === null)
{
unset($this->input[$super_global][$var_name]);
if (!$this->super_globals_disabled())
{
unset($GLOBALS[$this->super_globals[$super_global]][$var_name]);
}
}
else
{
$this->input[$super_global][$var_name] = $value;
if (!$this->super_globals_disabled())
{
$GLOBALS[$this->super_globals[$super_global]][$var_name] = $value;
}
}
if (!$this->super_globals_disabled())
{
unset($GLOBALS[$this->super_globals[$super_global]][$var_name]);
$GLOBALS[$this->super_globals[$super_global]][$var_name] = $value;
}
}
/**
* Central type safe input handling function.
* All variables in GET or POST requests should be retrieved through this function to maximise security.
*
* @param string|array $var_name The form variable's name from which data shall be retrieved.
* If the value is an array this may be an array of indizes which will give
* direct access to a value at any depth. E.g. if the value of "var" is array(1 => "a")
* then specifying array("var", 1) as the name will return "a".
* @param mixed $default A default value that is returned if the variable was not set.
* This function will always return a value of the same type as the default.
* @param bool $multibyte If $default is a string this paramater has to be true if the variable may contain any UTF-8 characters
* Default is false, causing all bytes outside the ASCII range (0-127) to be replaced with question marks
* @param phpbb_request_interface::POST|GET|REQUEST|COOKIE $super_global
* Specifies which super global should be used
*
* @return mixed The value of $_REQUEST[$var_name] run through {@link set_var set_var} to ensure that the type is the
* the same as that of $default. If the variable is not set $default is returned.
*/
public function variable($var_name, $default, $multibyte = false, $super_global = phpbb_request_interface::REQUEST)
{
$path = false;
// deep direct access to multi dimensional arrays
if (is_array($var_name))
{
$path = $var_name;
// make sure at least the variable name is specified
if (empty($path))
{
return (is_array($default)) ? array() : $default;
}
// the variable name is the first element on the path
$var_name = array_shift($path);
}
if (!isset($this->input[$super_global][$var_name]))
{
return (is_array($default)) ? array() : $default;
}
$var = $this->input[$super_global][$var_name];
if ($path)
{
// walk through the array structure and find the element we are looking for
foreach ($path as $key)
{
if (is_array($var) && isset($var[$key]))
{
$var = $var[$key];
}
else
{
return (is_array($default)) ? array() : $default;
}
}
}
$this->type_cast_helper->recursive_set_var($var, $default, $multibyte);
return $var;
}
/**
* Shortcut method to retrieve SERVER variables.
*
* Also fall back to getenv(), some CGI setups may need it (probably not, but
* whatever).
*
* @param string|array $var_name See phpbb_request_interface::variable
* @param mixed $Default See phpbb_request_interface::variable
*
* @return mixed The server variable value.
*/
public function server($var_name, $default = '')
{
$multibyte = true;
if ($this->is_set($var_name, phpbb_request_interface::SERVER))
{
return $this->variable($var_name, $default, $multibyte, phpbb_request_interface::SERVER);
}
else
{
$var = getenv($var_name);
$this->type_cast_helper->recursive_set_var($var, $default, $multibyte);
return $var;
}
}
/**
* Shortcut method to retrieve the value of client HTTP headers.
*
* @param string|array $header_name The name of the header to retrieve.
* @param mixed $default See phpbb_request_interface::variable
*
* @return mixed The header value.
*/
public function header($header_name, $default = '')
{
$var_name = 'HTTP_' . str_replace('-', '_', strtoupper($header_name));
return $this->server($var_name, $default);
}
/**
* Shortcut method to retrieve $_FILES variables
*
* @param string $form_name The name of the file input form element
*
* @return array The uploaded file's information
*/
public function file($form_name)
{
return $this->variable($form_name, array(), false, phpbb_request_interface::FILES);
}
/**
* Checks whether a certain variable was sent via POST.
* To make sure that a request was sent using POST you should call this function
* on at least one variable.
*
* @param string $name The name of the form variable which should have a
* _p suffix to indicate the check in the code that creates the form too.
*
* @return bool True if the variable was set in a POST request, false otherwise.
*/
public function is_set_post($name)
{
return $this->is_set($name, phpbb_request_interface::POST);
}
/**
* Checks whether a certain variable is set in one of the super global
* arrays.
*
* @param string $var Name of the variable
* @param phpbb_request_interface::POST|GET|REQUEST|COOKIE $super_global
* Specifies the super global which shall be checked
*
* @return bool True if the variable was sent as input
*/
public function is_set($var, $super_global = phpbb_request_interface::REQUEST)
{
return isset($this->input[$super_global][$var]);
}
/**
* Checks whether the current request is an AJAX request (XMLHttpRequest)
*
* @return bool True if the current request is an ajax request
*/
public function is_ajax()
{
return $this->header('X-Requested-With') == 'XMLHttpRequest';
}
/**
* Checks if the current request is happening over HTTPS.
*
* @return bool True if the request is secure.
*/
public function is_secure()
{
return $this->server('HTTPS') == 'on';
}
/**
* Returns all variable names for a given super global
*
* @param phpbb_request_interface::POST|GET|REQUEST|COOKIE $super_global
* The super global from which names shall be taken
*
* @return array All variable names that are set for the super global.
* Pay attention when using these, they are unsanitised!
*/
public function variable_names($super_global = phpbb_request_interface::REQUEST)
{
if (!isset($this->input[$super_global]))
{
return array();
}
return array_keys($this->input[$super_global]);
}
}
|
