From 028c6682935232c50ec729f38f97b2342f8363ad Mon Sep 17 00:00:00 2001
From: Roeland Jago Douma <roeland@famdouma.nl>
Date: Tue, 15 Nov 2016 17:51:03 +0100
Subject: [PATCH] Do not cache version info in the sessions

If the session is cleared and closed for whatever reason the loadVersion
will write to the session anyways. This will lead to an exception.

This should fix #1303

Signed-off-by: Roeland Jago Douma <roeland@famdouma.nl>
---
 lib/private/legacy/util.php | 61 +++++++++++++++++++------------------
 1 file changed, 32 insertions(+), 29 deletions(-)

diff --git a/lib/private/legacy/util.php b/lib/private/legacy/util.php
index ecc8f053704..3ffd3bd3ccd 100644
--- a/lib/private/legacy/util.php
+++ b/lib/private/legacy/util.php
@@ -66,6 +66,9 @@ class OC_Util {
 	private static $rootMounted = false;
 	private static $fsSetup = false;
 
+	/** @var array Local cache of version.php */
+	private static $versionCache = null;
+
 	protected static function getAppManager() {
 		return \OC::$server->getAppManager();
 	}
@@ -397,7 +400,7 @@ class OC_Util {
 	 */
 	public static function getVersion() {
 		OC_Util::loadVersion();
-		return \OC::$server->getSession()->get('OC_Version');
+		return self::$versionCache['OC_Version'];
 	}
 
 	/**
@@ -407,7 +410,7 @@ class OC_Util {
 	 */
 	public static function getVersionString() {
 		OC_Util::loadVersion();
-		return \OC::$server->getSession()->get('OC_VersionString');
+		return self::$versionCache['OC_VersionString'];
 	}
 
 	/**
@@ -424,7 +427,7 @@ class OC_Util {
 	 */
 	public static function getChannel() {
 		OC_Util::loadVersion();
-		return \OC::$server->getSession()->get('OC_Channel');
+		return self::$versionCache['OC_Channel'];
 	}
 
 	/**
@@ -433,41 +436,41 @@ class OC_Util {
 	 */
 	public static function getBuild() {
 		OC_Util::loadVersion();
-		return \OC::$server->getSession()->get('OC_Build');
+		return self::$versionCache['OC_Build'];
 	}
 
 	/**
 	 * @description load the version.php into the session as cache
 	 */
 	private static function loadVersion() {
+		if (self::$versionCache !== null) {
+			return;
+		}
+
 		$timestamp = filemtime(OC::$SERVERROOT . '/version.php');
-		if (!\OC::$server->getSession()->exists('OC_Version') or OC::$server->getSession()->get('OC_Version_Timestamp') != $timestamp) {
-			require OC::$SERVERROOT . '/version.php';
-			$session = \OC::$server->getSession();
-			/** @var $timestamp int */
-			$session->set('OC_Version_Timestamp', $timestamp);
-			/** @var $OC_Version string */
-			$session->set('OC_Version', $OC_Version);
-			/** @var $OC_VersionString string */
-			$session->set('OC_VersionString', $OC_VersionString);
-			/** @var $OC_Build string */
-			$session->set('OC_Build', $OC_Build);
-			
-			// Allow overriding update channel
+		require OC::$SERVERROOT . '/version.php';
+		/** @var $timestamp int */
+		self::$versionCache['OC_Version_Timestamp'] = $timestamp;
+		/** @var $OC_Version string */
+		self::$versionCache['OC_Version'] = $OC_Version;
+		/** @var $OC_VersionString string */
+		self::$versionCache['OC_VersionString'] = $OC_VersionString;
+		/** @var $OC_Build string */
+		self::$versionCache['OC_Build'] = $OC_Build;
 			
-			if (\OC::$server->getSystemConfig()->getValue('installed', false)) {
-				$channel = \OC::$server->getAppConfig()->getValue('core', 'OC_Channel');
-			} else {
-				/** @var $OC_Channel string */
-				$channel = $OC_Channel;
-			}
+		// Allow overriding update channel
+		if (\OC::$server->getSystemConfig()->getValue('installed', false)) {
+			$channel = \OC::$server->getAppConfig()->getValue('core', 'OC_Channel');
+		} else {
+			/** @var $OC_Channel string */
+			$channel = $OC_Channel;
+		}
 			
-			if (!is_null($channel)) {
-				$session->set('OC_Channel', $channel);
-			} else {
-				/** @var $OC_Channel string */
-				$session->set('OC_Channel', $OC_Channel);
-			}
+		if (!is_null($channel)) {
+			self::$versionCache['OC_Channel'] = $channel;
+		} else {
+			/** @var $OC_Channel string */
+			self::$versionCache['OC_Channel'] = $OC_Channel;
 		}
 	}
 
-- 
2.39.5