Support RFC8438: IMAP STATUS=SIZE - for faster folder size calculation (#7269)

CHANGELOG

@@ -1,6 +1,7 @@
 CHANGELOG Roundcube Webmail
 ===========================
 
+- Support RFC8438: IMAP STATUS=SIZE - for faster folder size calculation (#7269)
 - MySQL: Use utf8mb4 charset and utf8mb4_unicode_ci collation (#6535, #7113)
 - Support for language codes up to 16 chars long (e.g. es-419) in database schema (#6851)
 - Relaxed domain name validation for extended TLDs support (#5588)

program/lib/Roundcube/rcube_imap.php

@@ -370,9 +370,9 @@ class rcube_imap extends rcube_storage
     /**
      * Returns the IMAP server's capability.
      *
-     * @param   string  $cap Capability name
+     * @param string $cap Capability name
      *
-     * @return  mixed   Capability value or TRUE if supported, FALSE if not
+     * @return mixed Capability value or TRUE if supported, FALSE if not
      */
     public function get_capability($cap)
     {
@@ -3181,6 +3181,13 @@ class rcube_imap extends rcube_storage
             return 0;
         }
 
+        if ($this->get_capability('STATUS=SIZE')) {
+            $status = $this->conn->status($folder, array('SIZE'));
+            if (is_array($status) && array_key_exists('SIZE', $status)) {
+                return (int) $status['SIZE'];
+            }
+        }
+
         // On Cyrus we can use special folder annotation, which should be much faster
         if ($this->get_vendor() == 'cyrus') {
             $idx    = '/shared/vendor/cmu/cyrus-imapd/size';

program/lib/Roundcube/rcube_imap_generic.php

@@ -1526,7 +1526,7 @@ class rcube_imap_generic
 
         if (!empty($return_opts) && $this->getCapability('LIST-STATUS')) {
             $lstatus     = true;
-            $status_opts = array('MESSAGES', 'RECENT', 'UIDNEXT', 'UIDVALIDITY', 'UNSEEN');
+            $status_opts = array('MESSAGES', 'RECENT', 'UIDNEXT', 'UIDVALIDITY', 'UNSEEN', 'SIZE');
             $opts        = array_diff($return_opts, $status_opts);
             $status_opts = array_diff($return_opts, $opts);
 

program/steps/settings/edit_folder.inc

@@ -237,13 +237,22 @@ function rcmail_folder_form($attrib)
         if ((!$options['noselect'] && !$options['is_root']) || $mbox == 'INBOX') {
             $msgcount = $storage->count($mbox, 'ALL', true, false);
 
-            // Size
             if ($msgcount) {
+                // Get the size on servers with supposed-to-be-fast method for that
+                if ($storage->get_capability('STATUS=SIZE')) {
+                    $size = $storage->folder_size($mbox);
+                    if ($size !== false) {
+                        $size = $RCMAIL->show_bytes($size);
+                    }
+                }
+
                 // create link with folder-size command
-                $onclick = sprintf("return %s.command('folder-size', '%s', this)",
-                    rcmail_output::JS_OBJECT_NAME, rcube::JQ($mbox));
-                $size = html::a(array('href' => '#', 'onclick' => $onclick,
-                    'id' => 'folder-size'), $RCMAIL->gettext('getfoldersize'));
+                if (!isset($size) || $size === false) {
+                    $onclick = sprintf("return %s.command('folder-size', '%s', this)",
+                        rcmail_output::JS_OBJECT_NAME, rcube::JQ($mbox));
+                    $size = html::a(array('href' => '#', 'onclick' => $onclick,
+                        'id' => 'folder-size'), $RCMAIL->gettext('getfoldersize'));
+                }
             }
             else {
                 // no messages -> zero size