From b2de3c32ee635788f2f34c98d529fdc167ca6a51 Mon Sep 17 00:00:00 2001
From: rvelices <rv-github@modusoptimus.com>
Date: Fri, 1 Dec 2006 01:46:32 +0000
Subject: - sessions are always started (even for visitors) - thumbnail order
 saved in the session instead of cookie

git-svn-id: http://piwigo.org/svn/trunk@1623 68402e56-0260-453c-a942-63ccdbb3a9ee
---
 include/functions_session.inc.php | 47 ++++++++++++++++++++++++++++++++++++++-
 include/section_init.inc.php      |  6 ++---
 include/user.inc.php              | 14 +++++-------
 index.php                         | 19 ++++++++--------
 4 files changed, 62 insertions(+), 24 deletions(-)

diff --git a/include/functions_session.inc.php b/include/functions_session.inc.php
index 7fdf5dde8..ba1820028 100644
--- a/include/functions_session.inc.php
+++ b/include/functions_session.inc.php
@@ -81,7 +81,7 @@ if (isset($conf['session_save_handler'])
 // cookie_path will return : "/meeting/gallery"
 function cookie_path()
 {
-  if ( isset($_SERVER['REDIRECT_SCRIPT_NAME']) and 
+  if ( isset($_SERVER['REDIRECT_SCRIPT_NAME']) and
        !empty($_SERVER['REDIRECT_SCRIPT_NAME']) )
   {
     $scr = $_SERVER['REDIRECT_SCRIPT_NAME'];
@@ -221,4 +221,49 @@ DELETE
   pwg_query($query);
   return true;
 }
+
+
+/**
+ * persistently stores a variable for the current session
+ * currently we use standard php sessions but it might change
+ * @return boolean true on success
+ * @see pwg_get_session_var, pwg_unset_session_var
+ */
+function pwg_set_session_var($var, $value)
+{
+  if ( !isset($_SESSION) )
+    return false;
+  $_SESSION['pwg_'.$var] = $value;
+  return true;
+}
+
+/**
+ * retrieves the value of a persistent variable for the current session
+ * currently we use standard php sessions but it might change
+ * @return mixed
+ * @see pwg_set_session_var, pwg_unset_session_var
+ */
+function pwg_get_session_var($var, $default = null)
+{
+  if (isset( $_SESSION['pwg_'.$var] ) )
+  {
+    return $_SESSION['pwg_'.$var];
+  }
+  return $default;
+}
+
+/**
+ * deletes a persistent variable for the current session
+ * currently we use standard php sessions but it might change
+ * @return boolean true on success
+ * @see pwg_set_session_var, pwg_get_session_var
+ */
+function pwg_unset_session_var($var)
+{
+  if ( !isset($_SESSION) )
+    return false;
+  unset( $_SESSION['pwg_'.$var] );
+  return true;
+}
+
 ?>
diff --git a/include/section_init.inc.php b/include/section_init.inc.php
index 7e3f87cfe..416d98849 100644
--- a/include/section_init.inc.php
+++ b/include/section_init.inc.php
@@ -297,15 +297,13 @@ while (isset($tokens[$i]))
 // By default, it is the same as the $user['nb_image_page']
 $page['nb_image_page'] = $user['nb_image_page'];
 
-if (isset($_COOKIE['pwg_image_order'])
-    and is_numeric($_COOKIE['pwg_image_order'])
-    and $_COOKIE['pwg_image_order'] > 0)
+if (pwg_get_session_var('image_order',0) > 0)
 {
   $orders = get_category_preferred_image_orders();
 
   $conf['order_by'] = str_replace(
     'ORDER BY ',
-    'ORDER BY '.$orders[ $_COOKIE['pwg_image_order'] ][1].',',
+    'ORDER BY '.$orders[ pwg_get_session_var('image_order',0) ][1].',',
     $conf['order_by']
     );
   $page['super_order_by'] = true;
diff --git a/include/user.inc.php b/include/user.inc.php
index f5c77b2f8..103052ad2 100644
--- a/include/user.inc.php
+++ b/include/user.inc.php
@@ -43,26 +43,22 @@ if (isset($_COOKIE[session_name()]))
     setcookie($conf['remember_me_name'], '', 0, cookie_path());
     redirect(make_index_url());
   }
-  elseif (empty($_SESSION['pwg_uid']))
-  { // timeout
-    setcookie(session_name(),'',0,
-        ini_get('session.cookie_path'),
-        ini_get('session.cookie_domain')
-      );
-  }
-  else
+  elseif (!empty($_SESSION['pwg_uid']))
   {
     $user['id'] = $_SESSION['pwg_uid'];
   }
 }
 
-
 // Now check the auto-login
 if ( $user['id']==$conf['guest_id'] )
 {
   auto_login();
 }
 
+if (session_id()=="")
+{
+  session_start();
+}
 
 // using Apache authentication override the above user search
 if ($conf['apache_authentication'] and isset($_SERVER['REMOTE_USER']))
diff --git a/index.php b/index.php
index bd9755b85..e4d5232e6 100644
--- a/index.php
+++ b/index.php
@@ -40,12 +40,14 @@ check_status(ACCESS_GUEST);
 //---------------------------------------------- change of image display order
 if (isset($_GET['image_order']))
 {
-  setcookie(
-    'pwg_image_order',
-    $_GET['image_order'] > 0 ? $_GET['image_order'] : '',
-    0, cookie_path()
-    );
-
+  if ( (int)$_GET['image_order'] > 0)
+  {
+    pwg_set_session_var('image_order', (int)$_GET['image_order']);
+  }
+  else
+  {
+    pwg_unset_session_var('image_order');
+  }
   redirect(
     duplicate_index_url(
       array(),        // nothing to redefine
@@ -260,10 +262,7 @@ if (isset($page['cat_nb_images']) and $page['cat_nb_images'] > 0
   // image order
   $template->assign_block_vars( 'preferred_image_order', array() );
 
-  $order_idx = isset($_COOKIE['pwg_image_order'])
-    ? $_COOKIE['pwg_image_order']
-    : 0
-    ;
+  $order_idx = pwg_get_session_var( 'image_order', 0 );
 
   $orders = get_category_preferred_image_orders();
   for ($i = 0; $i < count($orders); $i++)
-- 
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