Saving Data * * 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. * * * Session::set('MyValue', 6); * * * 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) * * * // 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)); * * * Accessing Data * * 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. * * * 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() * } * * * You can also get all the values in the session at once. This is useful for debugging. * * * Session::get_all(); // returns an array of all the session values. * * * Clearing Data * * 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 * * * Session::clear('MyValue'); // MyValue is no longer 6. * * * 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. * * * Session::clear_all(); * * * @see Cookie * @todo This class is currently really basic and could do with a more well-thought-out implementation. */ class Session { use Injectable; /** * Set session timeout in seconds. * * @var int * @config */ private static $timeout = 0; /** * @config * @var array */ private static $session_ips = array(); /** * @config * @var string */ private static $cookie_domain; /** * @config * @var string */ private static $cookie_path; /** * @config * @var string */ private static $session_store_path; /** * @config * @var boolean */ private static $cookie_secure = false; /** * Session data */ protected $data = array(); protected $changedData = array(); protected function userAgent() { if (isset($_SERVER['HTTP_USER_AGENT'])) { return $_SERVER['HTTP_USER_AGENT']; } else { return ''; } } /** * Start PHP session, then create a new Session object with the given start data. * * @param $data array|Session 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 = $data; if (isset($this->data['HTTP_USER_AGENT'])) { if ($this->data['HTTP_USER_AGENT'] != $this->userAgent()) { // Funny business detected! $this->inst_clearAll(); $this->inst_destroy(); $this->inst_start(); } } } /** * Add a value to a specific key in the session array * * @param string $name * @param mixed $val */ public static function add_to_array($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 $name Key to lookup * @return mixed */ public static function get($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::$default_session = Injector::inst()->create('SilverStripe\\Control\\Session', isset($_SESSION) ? $_SESSION : array()); } return self::$default_session; } } public function inst_start($sid = null) { $path = Config::inst()->get('SilverStripe\\Control\\Session', 'cookie_path'); if(!$path) $path = Director::baseURL(); $domain = Config::inst()->get('SilverStripe\\Control\\Session', 'cookie_domain'); $secure = Director::is_https() && Config::inst()->get('SilverStripe\\Control\\Session', 'cookie_secure'); $session_path = Config::inst()->get('SilverStripe\\Control\\Session', 'session_store_path'); $timeout = Config::inst()->get('SilverStripe\\Control\\Session', 'timeout'); if(!session_id() && !headers_sent()) { if($domain) { session_set_cookie_params($timeout, $path, $domain, $secure, true); } else { session_set_cookie_params($timeout, $path, null, $secure, true); } // Allow storing the session in a non standard location if($session_path) session_save_path($session_path); // If we want a secure cookie for HTTPS, use a seperate session name. This lets us have a // seperate (less secure) session for non-HTTPS requests if($secure) session_name('SECSESSID'); if($sid) session_id($sid); session_start(); $this->data = isset($_SESSION) ? $_SESSION : array(); } // Modify the timeout behaviour so it's the *inactive* time before the session expires. // By default it's the total session lifetime if($timeout && !headers_sent()) { Cookie::set(session_name(), session_id(), $timeout/86400, $path, $domain ? $domain : null, $secure, true); } } public function inst_destroy($removeCookie = true) { if(session_id()) { if($removeCookie) { $path = Config::inst()->get('SilverStripe\\Control\\Session', 'cookie_path') ?: Director::baseURL(); $domain = Config::inst()->get('SilverStripe\\Control\\Session', 'cookie_domain'); $secure = Config::inst()->get('SilverStripe\\Control\\Session', 'cookie_secure'); Cookie::force_expiry(session_name(), $path, $domain, $secure, true); } session_destroy(); // Clean up the superglobal - session_destroy does not do it. // http://nz1.php.net/manual/en/function.session-destroy.php unset($_SESSION); $this->data = array(); } } public function inst_set($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]; } return null; } 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; } public function inst_finalize() { $this->inst_set('HTTP_USER_AGENT', $this->userAgent()); } /** * 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) { $this->inst_finalize(); if(!isset($_SESSION)) { $this->inst_start(); } $this->recursivelyApply($this->changedData, $_SESSION); } } /** * Recursively apply the changes represented in $data to $dest. * Used to update $_SESSION * * @param array $data * @param array $dest */ protected function recursivelyApply($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 string $formname the form name you wish to use ( usually $form->FormName() ) * @param string $message the message you wish to add to it * @param string $type the type of message */ public static function setFormMessage($formname, $message, $type) { Session::set("FormInfo.$formname.formError.message", $message); Session::set("FormInfo.$formname.formError.type", $type); } /** * Is there a session ID in the request? * @return bool */ public static function request_contains_session_id() { $secure = Director::is_https() && Config::inst()->get('SilverStripe\\Control\\Session', 'cookie_secure'); $name = $secure ? 'SECSESSID' : session_name(); return isset($_COOKIE[$name]) || isset($_REQUEST[$name]); } /** * Initialize session. * * @param string $sid Start the session with a specific ID */ public static function start($sid = null) { self::current_session()->inst_start($sid); } /** * 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) { self::current_session()->inst_destroy($removeCookie); } /** * Set the timeout of a Session value * * @deprecated 4.0 Use the "Session.timeout" config setting instead * * @param int $timeout Time until a session expires in seconds. Defaults to expire when browser is closed. */ public static function set_timeout($timeout) { Deprecation::notice('4.0', 'Use the "Session.timeout" config setting instead'); Config::inst()->update('SilverStripe\\Control\\Session', 'timeout', (int) $timeout); } /** * @deprecated 4.0 Use the "Session.timeout" config setting instead */ public static function get_timeout() { Deprecation::notice('4.0', 'Use the "Session.timeout" config setting instead'); return Config::inst()->get('SilverStripe\\Control\\Session', 'timeout'); } }