Patch to permit defining the webservice expire time when authenticating

WebserviceDefineExpireTime.diff

diff --git a/build/RESTexpiretimeparameter.sql b/build/RESTexpiretimeparameter.sql
new file mode 100644
index 0000000..dcf58de
--- /dev/null
+++ b/build/RESTexpiretimeparameter.sql
@@ -0,0 +1 @@
+INSERT INTO `vtiger_ws_operation_parameters`(`operationid`, `name`, `type`, `sequence`) VALUES ((SELECT `operationid` FROM `vtiger_ws_operation` WHERE `name`='getchallenge'),'exptime','string',2)
diff --git a/include/Webservices/AuthToken.php b/include/Webservices/AuthToken.php
index 7779348..f73c72e 100644
--- a/include/Webservices/AuthToken.php
+++ b/include/Webservices/AuthToken.php
@@ -8,7 +8,7 @@
  * All Rights Reserved.
  *************************************************************************************/
        
-   function vtws_getchallenge($username){
+ function vtws_getchallenge($username,$exptime){
                
                global $adb;
                
@@ -17,7 +17,8 @@
                $authToken = uniqid();
                
                $servertime = time();
-           $expireTime = time()+(60*5);
+         if (empty($exptime)) $exptime = 5;
+         $expireTime = time()+(60*$exptime);
                
                $sql = "delete from vtiger_ws_userauthtoken where userid=?";
                $adb->pquery($sql,array($userid));