513 lines
13 KiB
PHP
513 lines
13 KiB
PHP
<?php
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/**
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* Handles all manipulation of the session.
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*
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* The static methods are used to manipulate the currently active controller's session.
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* The instance methods are used to manipulate a particular session. There can be more than one of these created.
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*
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* In order to support things like testing, the session is associated with a particular Controller. In normal usage,
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* this is loaded from and saved to the regular PHP session, but for things like static-page-generation and
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* unit-testing, you can create multiple Controllers, each with their own session.
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*
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* The instance object is basically just a way of manipulating a set of nested maps, and isn't specific to session
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* data.
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*
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* <b>Saving Data</b>
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*
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* You can write a value to a users session from your PHP code using the static function {@link Session::set()}. You
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* can add this line in any function or file you wish to save the value.
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*
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* <code>
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* Session::set('MyValue', 6);
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* </code>
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*
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* Saves the value of "6" to the MyValue session data. You can also save arrays or serialized objects in session (but
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* note there may be size restrictions as to how much you can save)
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*
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* <code>
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* // save a variable
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* $var = 1;
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* Session::set('MyVar', $var);
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*
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* // saves an array
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* Session::set('MyArrayOfValues', array('1','2','3'));
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*
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* // saves an object (you'll have to unserialize it back)
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* $object = new Object();
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*
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* Session::set('MyObject', serialize($object));
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* </code>
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*
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* <b>Accessing Data</b>
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*
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* Once you have saved a value to the Session you can access it by using the {@link Session::get()} function.
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* Like the {@link Session::set()} function you can use this anywhere in your PHP files.
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*
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* The values in the comments are the values stored from the previous example.
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*
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* <code>
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* public function bar() {
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* $value = Session::get('MyValue'); // $value = 6
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* $var = Session::get('MyVar'); // $var = 1
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* $array = Session::get('MyArrayOfValues'); // $array = array(1,2,3)
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* $object = Session::get('MyObject', unserialize($object)); // $object = Object()
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* }
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* </code>
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*
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* You can also get all the values in the session at once. This is useful for debugging.
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*
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* <code>
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* Session::get_all(); // returns an array of all the session values.
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* </code>
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*
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* <b>Clearing Data</b>
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*
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* Once you have accessed a value from the Session it doesn't automatically wipe the value from the Session, you have
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* to specifically remove it. To clear a value you can either delete 1 session value by the name that you saved it
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*
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* <code>
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* Session::clear('MyValue'); // myvalue is no longer 6.
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* </code>
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*
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* Or you can clear every single value in the session at once. Note SilverStripe stores some of its own session data
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* including form and page comment information. None of this is vital but clear_all will clear everything.
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*
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* <code>
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* Session::clear_all();
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* </code>
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*
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* @see Cookie
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* @todo This class is currently really basic and could do with a more well-thought-out implementation.
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*
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* @package framework
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* @subpackage control
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*/
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class Session {
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/**
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* @var $timeout Set session timeout
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*/
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protected static $timeout = 0;
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protected static $session_ips = array();
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protected static $cookie_domain;
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protected static $cookie_path;
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protected static $session_store_path;
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protected static $cookie_secure = false;
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/**
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* Session data
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*/
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protected $data = array();
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protected $changedData = array();
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/**
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* Start PHP session, then create a new Session object with the given start data.
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*
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* @param $data Can be an array of data (such as $_SESSION) or another Session object to clone.
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*/
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public function __construct($data) {
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if($data instanceof Session) $data = $data->inst_getAll();
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$this->data = $data;
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}
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/**
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* Cookie domain, for example 'www.php.net'.
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*
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* To make cookies visible on all subdomains then the domain
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* must be prefixed with a dot like '.php.net'.
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*
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* @param string $domain The domain to set
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*/
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public static function set_cookie_domain($domain) {
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self::$cookie_domain = $domain;
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}
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/**
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* Get the cookie domain.
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* @return string
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*/
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public static function get_cookie_domain() {
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return self::$cookie_domain;
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}
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/**
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* Path to set on the domain where the session cookie will work.
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* Use a single slash ('/') for all paths on the domain.
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*
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* @param string $path The path to set
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*/
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public static function set_cookie_path($path) {
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self::$cookie_path = $path;
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}
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/**
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* Get the path on the domain where the session cookie will work.
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* @return string
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*/
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public static function get_cookie_path() {
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if(self::$cookie_path) {
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return self::$cookie_path;
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} else {
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return Director::baseURL();
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}
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}
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/**
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* Secure cookie, tells the browser to only send it over SSL.
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* @param boolean $secure
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*/
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public static function set_cookie_secure($secure) {
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self::$cookie_secure = (bool) $secure;
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}
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/**
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* Get if the cookie is secure
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* @return boolean
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*/
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public static function get_cookie_secure() {
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return (bool) self::$cookie_secure;
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}
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/**
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* Set the session store path
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* @param string $path Filesystem path to the session store
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*/
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public static function set_session_store_path($path) {
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self::$session_store_path = $path;
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}
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/**
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* Get the session store path
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* @return string
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*/
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public static function get_session_store_path() {
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return self::$session_store_path;
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}
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/**
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* Provide an <code>array</code> of rules specifing timeouts for IPv4 address ranges or
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* individual IPv4 addresses. The key is an IP address or range and the value is the time
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* until the session expires in seconds. For example:
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*
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* Session::set_timeout_ips(array(
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* '127.0.0.1' => 36000
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* ));
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*
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* Any user connecting from 127.0.0.1 (localhost) will have their session expired after 10 hours.
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*
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* Session::set_timeout is used to set the timeout value for any users whose address is not in the given IP range.
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*
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* @param array $session_ips Array of IPv4 rules.
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*/
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public static function set_timeout_ips($session_ips) {
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if(!is_array($session_ips)) {
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user_error("Session::set_timeout_ips expects an array as its argument", E_USER_NOTICE);
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self::$session_ips = array();
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} else {
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self::$session_ips = $session_ips;
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}
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}
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/**
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* Add a value to a specific key in the session array
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*/
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public static function add_to_array($name, $val) {
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return self::current_session()->inst_addToArray($name, $val);
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}
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/**
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* Set a key/value pair in the session
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*
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* @param string $name Key
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* @param string $val Value
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*/
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public static function set($name, $val) {
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return self::current_session()->inst_set($name, $val);
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}
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/**
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* Return a specific value by session key
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*
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* @param string $name Key to lookup
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*/
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public static function get($name) {
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return self::current_session()->inst_get($name);
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}
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/**
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* Return all the values in session
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*
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* @return Array
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*/
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public static function get_all() {
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return self::current_session()->inst_getAll();
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}
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/**
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* Clear a given session key, value pair.
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*
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* @param string $name Key to lookup
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*/
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public static function clear($name) {
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return self::current_session()->inst_clear($name);
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}
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/**
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* Clear all the values
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*
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* @return void
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*/
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public static function clear_all() {
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self::current_session()->inst_clearAll();
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self::$default_session = null;
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}
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/**
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* Save all the values in our session to $_SESSION
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*/
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public static function save() {
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return self::current_session()->inst_save();
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}
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protected static $default_session = null;
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protected static function current_session() {
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if(Controller::has_curr()) {
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return Controller::curr()->getSession();
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} else {
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if(!self::$default_session) self::$default_session = new Session(isset($_SESSION) ? $_SESSION : array());
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return self::$default_session;
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}
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}
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public function inst_set($name, $val) {
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// Quicker execution path for "."-free names
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if(strpos($name,'.') === false) {
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$this->data[$name] = $val;
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$this->changedData[$name] = $val;
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} else {
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$names = explode('.', $name);
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// We still want to do this even if we have strict path checking for legacy code
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$var = &$this->data;
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$diffVar = &$this->changedData;
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// Iterate twice over the names - once to see if the value needs to be changed,
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// and secondly to get the changed data value. This is done to solve a problem
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// where iterating over the diff var would create empty arrays, and the value
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// would then not be set, inadvertently clearing session values.
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foreach($names as $n) {
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$var = &$var[$n];
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}
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if($var !== $val) {
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foreach($names as $n) {
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$diffVar = &$diffVar[$n];
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}
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$var = $val;
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$diffVar = $val;
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}
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}
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}
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public function inst_addToArray($name, $val) {
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$names = explode('.', $name);
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// We still want to do this even if we have strict path checking for legacy code
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$var = &$this->data;
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$diffVar = &$this->changedData;
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foreach($names as $n) {
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$var = &$var[$n];
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$diffVar = &$diffVar[$n];
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}
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$var[] = $val;
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$diffVar[sizeof($var)-1] = $val;
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}
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public function inst_get($name) {
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// Quicker execution path for "."-free names
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if(strpos($name,'.') === false) {
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if(isset($this->data[$name])) return $this->data[$name];
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} else {
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$names = explode('.', $name);
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if(!isset($this->data)) {
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return null;
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}
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$var = $this->data;
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foreach($names as $n) {
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if(!isset($var[$n])) {
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return null;
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}
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$var = $var[$n];
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}
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return $var;
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}
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}
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public function inst_clear($name) {
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$names = explode('.', $name);
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// We still want to do this even if we have strict path checking for legacy code
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$var = &$this->data;
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$diffVar = &$this->changedData;
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foreach($names as $n) {
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// don't clear a record that doesn't exist
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if(!isset($var[$n])) return;
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$var = &$var[$n];
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}
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// only loop to find data within diffVar if var is proven to exist in the above loop
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foreach($names as $n) {
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$diffVar = &$diffVar[$n];
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}
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if($var !== null) {
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$var = null;
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$diffVar = null;
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}
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}
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public function inst_clearAll() {
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if($this->data && is_array($this->data)) {
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foreach(array_keys($this->data) as $key) {
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$this->inst_clear($key);
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}
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}
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}
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public function inst_getAll() {
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return $this->data;
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}
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/**
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* Save data to session
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* Only save the changes, so that anyone manipulating $_SESSION directly doesn't get burned.
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*/
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public function inst_save() {
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if($this->changedData) {
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if(!isset($_SESSION)) Session::start();
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$this->recursivelyApply($this->changedData, $_SESSION);
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}
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}
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/**
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* Recursively apply the changes represented in $data to $dest.
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* Used to update $_SESSION
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*/
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protected function recursivelyApply($data, &$dest) {
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foreach($data as $k => $v) {
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if(is_array($v)) {
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if(!isset($dest[$k])) $dest[$k] = array();
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$this->recursivelyApply($v, $dest[$k]);
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} else {
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$dest[$k] = $v;
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}
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}
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}
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/**
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* Return the changed data, for debugging purposes.
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* @return array
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*/
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public function inst_changedData() {
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return $this->changedData;
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}
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/**
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* Sets the appropriate form message in session, with type. This will be shown once,
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* for the form specified.
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*
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* @param formname the form name you wish to use ( usually $form->FormName() )
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* @param messsage the message you wish to add to it
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* @param type the type of message
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*/
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public static function setFormMessage($formname,$message,$type){
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Session::set("FormInfo.$formname.message", $message);
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Session::set("FormInfo.$formname.type", $type);
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}
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/**
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* Initialize session.
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*
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* @param string $sid Start the session with a specific ID
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*/
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public static function start($sid = null) {
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$path = self::get_cookie_path();
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$domain = self::get_cookie_domain();
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$secure = self::get_cookie_secure();
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$session_path = self::get_session_store_path();
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if(!session_id() && !headers_sent()) {
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if($domain) {
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session_set_cookie_params(self::$timeout, $path, $domain, $secure /* secure */, true /* httponly */);
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} else {
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session_set_cookie_params(self::$timeout, $path, null, $secure /* secure */, true /* httponly */);
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}
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// Allow storing the session in a non standard location
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if($session_path) session_save_path($session_path);
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// @ is to supress win32 warnings/notices when session wasn't cleaned up properly
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// There's nothing we can do about this, because it's an operating system function!
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if($sid) session_id($sid);
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@session_start();
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}
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}
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/**
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* Destroy the active session.
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*
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* @param bool $removeCookie If set to TRUE, removes the user's cookie, FALSE does not remove
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*/
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public static function destroy($removeCookie = true) {
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if(session_id()) {
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if($removeCookie) {
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$path = self::get_cookie_path();
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$domain = self::get_cookie_domain();
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$secure = self::get_cookie_secure();
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if($domain) {
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setcookie(session_name(), '', null, $path, $domain, $secure, true);
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}
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else {
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setcookie(session_name(), '', null, $path, null, $secure, true);
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}
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unset($_COOKIE[session_name()]);
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}
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session_destroy();
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}
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}
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/**
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* Set the timeout of a Session value
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*
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* @param int $timeout Time until a session expires in seconds. Defaults to expire when browser is closed.
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*/
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public static function set_timeout($timeout) {
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self::$timeout = intval($timeout);
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}
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public static function get_timeout() {
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return self::$timeout;
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}
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}
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