add ISession::getId() wrapper for session_id

lib/private/Session/CryptoSessionData.php

@@ -141,6 +141,16 @@ class CryptoSessionData implements \ArrayAccess, ISession {
 		$this->session->regenerateId($deleteOldSession);
 	}
 
+	/**
+	 * Wrapper around session_id
+	 *
+	 * @return string
+	 * @since 9.1.0
+	 */
+	public function getId() {
+		return $this->session->getId();
+	}
+
 	/**
 	 * Close the session and release the lock, also writes all changed data in batch
 	 */

lib/private/Session/Internal.php

@@ -111,6 +111,16 @@ class Internal extends Session {
 		@session_regenerate_id($deleteOldSession);
 	}
 
+	/**
+	 * Wrapper around session_id
+	 *
+	 * @return string
+	 * @since 9.1.0
+	 */
+	public function getId() {
+		return @session_id();
+	}
+
 	/**
 	 * @throws \Exception
 	 */

lib/private/Session/Memory.php

@@ -88,6 +88,16 @@ class Memory extends Session {
 	 */
 	public function regenerateId($deleteOldSession = true) {}
 
+	/**
+	 * Wrapper around session_id
+	 *
+	 * @return string
+	 * @since 9.1.0
+	 */
+	public function getId() {
+		throw new \Exception('Memory session does not have an ID');
+	}
+
 	/**
 	 * Helper function for PHPUnit execution - don't use in non-test code
 	 */

lib/public/isession.php

@@ -95,4 +95,12 @@ interface ISession {
 	 * @since 9.0.0
 	 */
 	public function regenerateId($deleteOldSession = true);
+
+	/**
+	 * Wrapper around session_id
+	 *
+	 * @return string
+	 * @since 9.1.0
+	 */
+	public function getId();
 }

tests/lib/session/memory.php

@@ -10,8 +10,17 @@
 namespace Test\Session;
 
 class Memory extends Session {
+
 	protected function setUp() {
 		parent::setUp();
 		$this->instance = new \OC\Session\Memory($this->getUniqueID());
 	}
+
+	/**
+	 * @expectedException \Exception
+	 */
+	public function testThrowsExceptionOnGetId() {
+		$this->instance->getId();
+	}
+
 }