fallback to client side sorting if server side sorting is selected but not supported by the IMAP server.

functions/imap_messages.php

@@ -128,7 +128,7 @@ function sqimap_get_sort_order ($imap_stream, $sort) {
     if (!empty($sort_on[$sort])) {
         $sort_query = "$sid SORT ($sort_on[$sort]) ".strtoupper($default_charset)." ALL\r\n";
         fputs($imap_stream, $sort_query);
-        $sort_test = sqimap_read_data($imap_stream, $sid, true, $response, $message);
+        $sort_test = sqimap_read_data($imap_stream, $sid, false, $response, $message);
     }
     if (preg_match("/^\* SORT (.+)$/", $sort_test[0], $regs)) {
         $server_sort_array = preg_split("/ /", trim($regs[1]));
@@ -136,6 +136,9 @@ function sqimap_get_sort_order ($imap_stream, $sort) {
     if ($sort == 0 || $sort == 2 || $sort == 4) {
        $server_sort_array = array_reverse($server_sort_array);
     }
+    if (!preg_match("/OK/", $response)) {
+	   $server_sort_array = 'no';
+	}
     session_register('server_sort_array');
     return $server_sort_array;
 }
@@ -236,13 +239,17 @@ function get_thread_sort ($imap_stream) {
     }
     $thread_query = "$sid THREAD $sort_type ".strtoupper($default_charset)." ALL\r\n";
     fputs($imap_stream, $thread_query);
-    $thread_test = sqimap_read_data($imap_stream, $sid, true, $response, $message);
+    $thread_test = sqimap_read_data($imap_stream, $sid, false, $response, $message);
     if (preg_match("/^\* THREAD (.+)$/", $thread_test[0], $regs)) {
        $thread_list = trim($regs[1]);
     }
     else {
        $thread_list = "";
     }
+    if (!preg_match("/OK/", $response)) {
+	   $server_sort_array = 'no';
+	   return $server_sort_array;
+	}
     $thread_temp = preg_split("//", $thread_list, -1, PREG_SPLIT_NO_EMPTY);
     $char_count = count($thread_temp);
     $counter = 0;

functions/mailbox_display.php

@@ -236,27 +236,46 @@ function showMessagesForMailbox($imapConnection, $mailbox, $num_msgs,
    */
   if ($thread_sort_messages == 1) {
     $id = get_thread_sort($imapConnection);
-    $sort = 6;
-    if ($start_msg + ($show_num - 1) < $num_msgs) {
-      $end_msg = $start_msg + ($show_num-1);
-    } 
-	else {
-      $end_msg = $num_msgs;
-    }
-    $id = array_slice($id, ($start_msg-1), ($end_msg));
+  if ($id == 'no') {
+      echo '<b><small><center><font color=red>Thread sorting is not'.
+             ' supported by your IMAP server.<br>Please report this'.
+             'to the system administrator.</center></small></b>';
+     $thread_sort_messages == 0; 
+    $id = array();
+  }
+  else {
+      $sort = 6;
+      if ($start_msg + ($show_num - 1) < $num_msgs) {
+        $end_msg = $start_msg + ($show_num-1);
+      } 
+      else {
+        $end_msg = $num_msgs;
+      }
+      $id = array_slice($id, ($start_msg-1), ($end_msg));
+      }
   }
 
   if ($allow_server_sort == TRUE && $thread_sort_messages != 1) {
     $server_sort_order = $sort;
     $id = sqimap_get_sort_order($imapConnection, $server_sort_order);
-    $sort = 6;
-    if ($start_msg + ($show_num - 1) < $num_msgs) {
-      $end_msg = $start_msg + ($show_num-1);
-    } 
+  if ($id == 'no') {
+    echo '<b><small><center><font color=red>Server-side sorting '.
+       'is not supported by your IMAP server.<br>Please report this'.
+       ' to the system administrator.</center></small></b>';
+    $sort = $server_sort_order;
+	  $allow_server_sort = false;
+	  $id = array();
+	}
 	else {
-      $end_msg = $num_msgs;
-    }
-    $id = array_slice($id, ($start_msg-1), ($end_msg));
+      $sort = 6;
+      if ($start_msg + ($show_num - 1) < $num_msgs) {
+        $end_msg = $start_msg + ($show_num-1);
+      } 
+	  else {
+        $end_msg = $num_msgs;
+      }
+      $id = array_slice($id, ($start_msg-1), ($end_msg));
+	}
   }
 
   /* If autoexpunge is turned on, then do it now. */