3 files changed, 21 insertions, 4 deletions
diff --git a/program/steps/mail/func.inc b/program/steps/mail/func.inc
index b04628fa4..0c19b661b 100644
--- a/program/steps/mail/func.inc
+++ b/program/steps/mail/func.inc
@@ -1448,7 +1448,7 @@ function rcmail_send_mdn($message, &$smtp_error)
 {
   global $RCMAIL, $IMAP;
 
-  if (!is_a($message, rcube_message))
+  if (!is_object($message) || !is_a($message, rcube_message))
     $message = new rcube_message($message);
 
   if ($message->headers->mdn_to && !$message->headers->mdn_sent &&
diff --git a/program/steps/mail/get.inc b/program/steps/mail/get.inc
index 9138554f7..4eccd287e 100644
--- a/program/steps/mail/get.inc
+++ b/program/steps/mail/get.inc
@@ -79,10 +79,23 @@ else if ($pid = get_input_value('_part', RCUBE_INPUT_GET)) {
     $ctype_secondary = strtolower($part->ctype_secondary);
     $mimetype = sprintf('%s/%s', $ctype_primary, $ctype_secondary);
 
+    // allow post-processing of the message body
+    $plugin = $RCMAIL->plugins->exec_hook('message_part_get',
+      array('id' => $part->mime_id, 'mimetype' => $mimetype, 'part' => $part, 'download' => !empty($_GET['_download'])));
+
+    if ($plugin['abort'])
+      exit;
+
+    // overwrite modified vars from plugin
+    $mimetype = $plugin['mimetype'];
+    list($ctype_primary, $ctype_secondary) = explode('/', $mimetype);
+    if ($plugin['body'])
+      $part->body = $plugin['body'];
+
     $browser = $RCMAIL->output->browser;
 
     // send download headers
-    if ($_GET['_download']) {
+    if ($plugin['download']) {
       header("Content-Type: application/octet-stream");
       if ($browser->ie)
         header("Content-Type: application/force-download");
@@ -97,7 +110,7 @@ else if ($pid = get_input_value('_part', RCUBE_INPUT_GET)) {
     }
 
     // deliver part content
-    if ($ctype_primary == 'text' && $ctype_secondary == 'html' && empty($_GET['_download'])) {
+    if ($ctype_primary == 'text' && $ctype_secondary == 'html' && empty($plugin['download'])) {
       // get part body if not available
       if (!$part->body)
         $part->body = $MESSAGE->get_part_content($part->mime_id);
@@ -119,7 +132,7 @@ else if ($pid = get_input_value('_part', RCUBE_INPUT_GET)) {
       else
         $filename = addcslashes($filename, '"');
 
-      $disposition = !empty($_GET['_download']) ? 'attachment' : 'inline';
+      $disposition = !empty($plugin['download']) ? 'attachment' : 'inline';
 
       header("Content-Disposition: $disposition; filename=\"$filename\"");
 
diff --git a/program/steps/mail/show.inc b/program/steps/mail/show.inc
index 3c2fa238e..1472a9e61 100644
--- a/program/steps/mail/show.inc
+++ b/program/steps/mail/show.inc
@@ -52,6 +52,10 @@ if ($uid = get_input_value('_uid', RCUBE_INPUT_GET)) {
   $OUTPUT->set_env('delimiter', $IMAP->get_hierarchy_delimiter());
   $OUTPUT->set_env('mailbox', $mbox_name);
 
+  // mimetypes supported by the browser (default settings)
+  $mimetypes = $RCMAIL->config->get('client_mimetypes', 'text/plain,text/html,text/xml,image/jpeg,image/gif,image/png,application/x-javascript,application/pdf,application/x-shockwave-flash');
+  $OUTPUT->set_env('mimetypes', is_string($mimetypes) ? explode(',', $mimetypes) : (array)$mimetypes);
+
   if ($CONFIG['trash_mbox'])
     $OUTPUT->set_env('trash_mailbox', $CONFIG['trash_mbox']);
   if ($CONFIG['flag_for_deletion'])