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