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AbstractSessionHandler.php
001 <?php
002
003 /*
004 * This file is part of the Symfony package.
005 *
006 * (c) Fabien Potencier <fabien@symfony.com>
007 *
008 * For the full copyright and license information, please view the LICENSE
009 * file that was distributed with this source code.
010 */
011
012 namespace Symfony\Component\HttpFoundation\Session\Storage\Handler;
013
014 use Symfony\Component\HttpFoundation\Session\SessionUtils;
015
016 /**
017 * This abstract session handler provides a generic implementation
018 * of the PHP 7.0 SessionUpdateTimestampHandlerInterface,
019 * enabling strict and lazy session handling.
020 *
021 * @author Nicolas Grekas <p@tchwork.com>
022 */
023 abstract class AbstractSessionHandler implements \SessionHandlerInterface, \SessionUpdateTimestampHandlerInterface
024 {
025 private $sessionName;
026 private $prefetchId;
027 private $prefetchData;
028 private $newSessionId;
029 private $igbinaryEmptyData;
030
031 /**
032 * @return bool
033 */
034 public function open($savePath, $sessionName)
035 {
036 $this->sessionName = $sessionName;
037 if (!headers_sent() && !ini_get('session.cache_limiter') && '0' !== ini_get('session.cache_limiter')) {
038 header(sprintf('Cache-Control: max-age=%d, private, must-revalidate', 60 * (int) ini_get('session.cache_expire')));
039 }
040
041 return true;
042 }
043
044 /**
045 * @param string $sessionId
046 *
047 * @return string
048 */
049 abstract protected function doRead($sessionId);
050
051 /**
052 * @param string $sessionId
053 * @param string $data
054 *
055 * @return bool
056 */
057 abstract protected function doWrite($sessionId, $data);
058
059 /**
060 * @param string $sessionId
061 *
062 * @return bool
063 */
064 abstract protected function doDestroy($sessionId);
065
066 /**
067 * @return bool
068 */
069 public function validateId($sessionId)
070 {
071 $this->prefetchData = $this->read($sessionId);
072 $this->prefetchId = $sessionId;
073
074 if (\PHP_VERSION_ID < 70317 || (70400 <= \PHP_VERSION_ID && \PHP_VERSION_ID < 70405)) {
075 // work around https://bugs.php.net/79413
076 foreach (debug_backtrace(\DEBUG_BACKTRACE_IGNORE_ARGS) as $frame) {
077 if (!isset($frame['class']) && isset($frame['function']) && \in_array($frame['function'], ['session_regenerate_id', 'session_create_id'], true)) {
078 return '' === $this->prefetchData;
079 }
080 }
081 }
082
083 return '' !== $this->prefetchData;
084 }
085
086 /**
087 * @return string
088 */
089 public function read($sessionId)
090 {
091 if (null !== $this->prefetchId) {
092 $prefetchId = $this->prefetchId;
093 $prefetchData = $this->prefetchData;
094 $this->prefetchId = $this->prefetchData = null;
095
096 if ($prefetchId === $sessionId || '' === $prefetchData) {
097 $this->newSessionId = '' === $prefetchData ? $sessionId : null;
098
099 return $prefetchData;
100 }
101 }
102
103 $data = $this->doRead($sessionId);
104 $this->newSessionId = '' === $data ? $sessionId : null;
105 if (\PHP_VERSION_ID < 70000) {
106 $this->prefetchData = $data;
107 }
108
109 return $data;
110 }
111
112 /**
113 * @return bool
114 */
115 public function write($sessionId, $data)
116 {
117 if (\PHP_VERSION_ID < 70000 && $this->prefetchData) {
118 $readData = $this->prefetchData;
119 $this->prefetchData = null;
120
121 if ($readData === $data) {
122 return $this->updateTimestamp($sessionId, $data);
123 }
124 }
125 if (null === $this->igbinaryEmptyData) {
126 // see https://github.com/igbinary/igbinary/issues/146
127 $this->igbinaryEmptyData = \function_exists('igbinary_serialize') ? igbinary_serialize([]) : '';
128 }
129 if ('' === $data || $this->igbinaryEmptyData === $data) {
130 return $this->destroy($sessionId);
131 }
132 $this->newSessionId = null;
133
134 return $this->doWrite($sessionId, $data);
135 }
136
137 /**
138 * @return bool
139 */
140 public function destroy($sessionId)
141 {
142 if (\PHP_VERSION_ID < 70000) {
143 $this->prefetchData = null;
144 }
145 if (!headers_sent() && filter_var(ini_get('session.use_cookies'), \FILTER_VALIDATE_BOOLEAN)) {
146 if (!$this->sessionName) {
147 throw new \LogicException(sprintf('Session name cannot be empty, did you forget to call "parent::open()" in "%s"?.', static::class));
148 }
149 $cookie = SessionUtils::popSessionCookie($this->sessionName, $sessionId);
150
151 /*
152 * We send an invalidation Set-Cookie header (zero lifetime)
153 * when either the session was started or a cookie with
154 * the session name was sent by the client (in which case
155 * we know it's invalid as a valid session cookie would've
156 * started the session).
157 */
158 if (null === $cookie || isset($_COOKIE[$this->sessionName])) {
159 if (\PHP_VERSION_ID < 70300) {
160 setcookie($this->sessionName, '', 0, ini_get('session.cookie_path'), ini_get('session.cookie_domain'), filter_var(ini_get('session.cookie_secure'), \FILTER_VALIDATE_BOOLEAN), filter_var(ini_get('session.cookie_httponly'), \FILTER_VALIDATE_BOOLEAN));
161 } else {
162 $params = session_get_cookie_params();
163 unset($params['lifetime']);
164 setcookie($this->sessionName, '', $params);
165 }
166 }
167 }
168
169 return $this->newSessionId === $sessionId || $this->doDestroy($sessionId);
170 }
171 }
172