- Fix when IMAP connection fails in 'get' action session shouldn't be destroyed (#1486995)

- Performance: improve mail/get action and skip one IMAP connection

CHANGELOG

@@ -22,6 +22,7 @@ CHANGELOG RoundCube Webmail
 - Fix handling of charsets with LATIN-* label
 - Fix messages background image handling in some cases (#1486990)
 - Fix format=flowed handling (#1486989)
+- Fix when IMAP connection fails in 'get' action session shouldn't be destroyed (#1486995)
 
 RELEASE 0.4
 -----------

program/steps/mail/func.inc

@@ -26,8 +26,8 @@ $SEARCH_MODS_DEFAULT = array('*' => array('subject'=>1, 'from'=>1), $SENT_MBOX =
 
 $EMAIL_ADDRESS_PATTERN = '([a-z0-9][a-z0-9\-\.\+\_]*@[a-z0-9][a-z0-9\-\.]*\\.[a-z]{2,5})';
 
-// actions that do not require imap connection
-$NOIMAP_ACTIONS = array('addcontact', 'autocomplete', 'upload', 'display-attachment', 'remove-attachment');
+// actions that do not require imap connection here
+$NOIMAP_ACTIONS = array('addcontact', 'autocomplete', 'upload', 'display-attachment', 'remove-attachment', 'get');
 
 // always instantiate imap object (but not yet connect to server)
 $RCMAIL->imap_init();

program/steps/mail/get.inc

@@ -35,6 +35,30 @@ if (!empty($_GET['_preload'])) {
 
 ob_end_clean();
 
+// Now we need IMAP connection
+if (!$RCMAIL->imap_connect()) {
+  // Get action is often executed simultanously.
+  // Some servers have MAXPERIP or other limits.
+  // To workaround this we'll wait for some time
+  // and try again (once).
+  // Note: When message contains more inline parts and the server limit is low
+  // this stil maybe the issue, while we're using the same sleep interval, but
+  // I didn't found better solution.
+  if (!isset($_GET['_redirected'])) {
+    sleep(2);
+    header('Location: ' . $_SERVER['REQUEST_URI'] . '&_redirected=1');
+  }
+  else {
+    raise_error(array(
+      'code' => 500, 'type' => 'php',
+      'file' => __FILE__, 'line' => __LINE__,
+      'message' => 'Unable to get/display message part. IMAP connection error'),
+      true, true);
+  }
+  // Don't kill session, just quit (#1486995)
+  exit;
+}
+
 // similar code as in program/steps/mail/show.inc
 if (!empty($_GET['_uid'])) {
   $RCMAIL->config->set('prefer_html', true);