4 files changed, 36 insertions, 38 deletions

diff --git a/program/steps/mail/compose.inc b/program/steps/mail/compose.inc
index 379e920e5..74c6d5f29 100644
--- a/program/steps/mail/compose.inc
+++ b/program/steps/mail/compose.inc
@@ -1154,16 +1154,7 @@ function rcmail_save_attachment(&$message, $pid)
   }
 
   $mimetype = $part->ctype_primary . '/' . $part->ctype_secondary;
-  $filename = $part->filename;
-  if (!strlen($filename)) {
-    if ($mimetype == 'text/html') {
-      $filename = rcube_label('htmlmessage');
-    }
-    else {
-      $filename = 'Part_'.$pid;
-    }
-    $filename .= '.' . $part->ctype_secondary;
-  }
+  $filename = rcmail_attachment_name($part);
 
   $attachment = array(
     'group' => $COMPOSE['id'],
diff --git a/program/steps/mail/func.inc b/program/steps/mail/func.inc
index 814adb64d..44a1557c3 100644
--- a/program/steps/mail/func.inc
+++ b/program/steps/mail/func.inc
@@ -1598,10 +1598,7 @@ function rcmail_message_part_controls($attrib)
   $part  = $MESSAGE->mime_parts[$part];
   $table = new html_table(array('cols' => 3));
 
-  $filename = $part->filename;
-  if (empty($filename) && $attach_prop->mimetype == 'text/html') {
-    $filename = rcube_label('htmlmessage');
-  }
+  $filename = rcmail_attachment_name($part);
 
   if (!empty($filename)) {
     $table->add('title', Q(rcube_label('filename')));
@@ -1616,7 +1613,6 @@ function rcmail_message_part_controls($attrib)
 }
 
 
-
 function rcmail_message_part_frame($attrib)
 {
   global $MESSAGE;
@@ -1841,6 +1837,37 @@ function rcmail_fix_mimetype($name)
   return $name;
 }
 
+// return attachment filename, handle empty filename case
+function rcmail_attachment_name($attachment, $display = false)
+{
+    $filename = $attachment->filename;
+
+    if ($filename === null || $filename === '') {
+        if ($attachment->mimetype == 'text/html') {
+            $filename = rcube_label('htmlmessage');
+        }
+        else {
+            $ext      = rcube_mime::get_mime_extensions($attachment->mimetype);
+            $ext      = array_shift($ext);
+            $filename = rcube_label('messagepart') . ' ' . $attachment->mime_id;
+            if ($ext) {
+                $filename .= '.' . $ext;
+            }
+        }
+    }
+
+    $filename = preg_replace('[\r\n]', '', $filename);
+
+    // Display smart names for some known mimetypes
+    if ($display) {
+        if (preg_match('/application\/(pgp|pkcs7)-signature/i', $attachment->mimetype)) {
+            $filename = rcube_label('digitalsig');
+        }
+    }
+
+    return $filename;
+}
+
 function rcmail_search_filter($attrib)
 {
   global $OUTPUT, $CONFIG;
diff --git a/program/steps/mail/get.inc b/program/steps/mail/get.inc
index 803716d61..37f728ebf 100644
--- a/program/steps/mail/get.inc
+++ b/program/steps/mail/get.inc
@@ -47,13 +47,7 @@ check_storage_status();
 // show part page
 if (!empty($_GET['_frame'])) {
   if (($part_id = get_input_value('_part', RCUBE_INPUT_GPC)) && ($part = $MESSAGE->mime_parts[$part_id])) {
-    $filename = $part->filename;
-    if (empty($filename) && $part->mimetype == 'text/html') {
-      $filename = rcube_label('htmlmessage');
-    }
-    if (!empty($filename)) {
-      $OUTPUT->set_pagetitle($filename);
-    }
+    $OUTPUT->set_pagetitle(rcmail_attachment_name($part));
   }
 
   $OUTPUT->send('messagepart');
@@ -236,18 +230,7 @@ else if (strlen($pid = get_input_value('_part', RCUBE_INPUT_GET))) {
       // don't kill the connection if download takes more than 30 sec.
       @set_time_limit(0);
 
-      if ($part->filename) {
-        $filename = $part->filename;
-      }
-      else if ($part->mimetype == 'text/html') {
-        $filename = rcube_label('htmlmessage');
-      }
-      else {
-        $ext = '.' . ($mimetype == 'text/plain' ? 'txt' : $ctype_secondary);
-        $filename = ($MESSAGE->subject ? $MESSAGE->subject : 'roundcube') . $ext;
-      }
-
-      $filename = preg_replace('[\r\n]', '', $filename);
+      $filename = rcmail_attachment_name($part);
 
       if ($browser->ie && $browser->ver < 7)
         $filename = rawurlencode(abbreviate_string($filename, 55));
diff --git a/program/steps/mail/show.inc b/program/steps/mail/show.inc
index 82594f3e4..64e628880 100644
--- a/program/steps/mail/show.inc
+++ b/program/steps/mail/show.inc
@@ -150,10 +150,7 @@ function rcmail_message_attachments($attrib)
 
   if (sizeof($MESSAGE->attachments)) {
     foreach ($MESSAGE->attachments as $attach_prop) {
-      $filename = $attach_prop->filename;
-      if (empty($filename) && $attach_prop->mimetype == 'text/html') {
-        $filename = rcube_label('htmlmessage');
-      }
+      $filename = rcmail_attachment_name($attach_prop, true);
 
       if ($PRINT_MODE) {
         $size = $RCMAIL->message_part_size($attach_prop);