diff --git a/common.php b/common.php
index 73388ce..289e031 100644
--- a/common.php
+++ b/common.php
@@ -568,8 +568,10 @@ function filecache()
 {
     $dir = sys_get_temp_dir();
     if (!is_writable($dir)) {
-        if ( is_writable(__DIR__ . '/tmp/') ) $dir = __DIR__ . '/tmp/';
-        if ( mkdir(__DIR__ . '/tmp/', 0777) ) $dir = __DIR__ . '/tmp/';
+        $tmp = __DIR__ . '/tmp/';
+        if (file_exists($tmp)) {
+            if ( is_writable($tmp) ) $dir = $tmp;
+        } elseif ( mkdir($tmp) ) $dir = $tmp;
     }
     $tag = __DIR__ . '/OneManager/' . $_SERVER['disktag'];
     while (strpos($tag, '/')>-1) $tag = str_replace('/', '_', $tag);
@@ -613,10 +615,10 @@ function config_oauth()
     if (getConfig('Drive_ver')=='CN') {
         // CN 21Vianet
         // https://portal.azure.cn
-        $_SERVER['client_id'] = '04c3ca0b-8d07-4773-85ad-98b037d25631';
-        $_SERVER['client_secret'] = 'h8@B7kFVOmj0+8HKBWeNTgl@pU/z4yLB';
-        //$_SERVER['client_id'] = 'b15f63f5-8b72-48b5-af69-8cab7579bff7';
-        //$_SERVER['client_secret'] = '0IIuZ1Kcq_YI3NrkZFwsniEo~BoP~8_M22';
+        //$_SERVER['client_id'] = '04c3ca0b-8d07-4773-85ad-98b037d25631';
+        //$_SERVER['client_secret'] = 'h8@B7kFVOmj0+8HKBWeNTgl@pU/z4yLB'; // expire 20200902
+        $_SERVER['client_id'] = 'b15f63f5-8b72-48b5-af69-8cab7579bff7';
+        $_SERVER['client_secret'] = '0IIuZ1Kcq_YI3NrkZFwsniEo~BoP~8_M22';
         $_SERVER['oauth_url'] = 'https://login.partner.microsoftonline.cn/common/oauth2/v2.0/';
         $_SERVER['api_url'] = 'https://microsoftgraph.chinacloudapi.cn/v1.0/me/drive/root';
         $_SERVER['scope'] = 'https://microsoftgraph.chinacloudapi.cn/Files.ReadWrite.All offline_access';