Display notice that message is encrypted also for application/pkcs7-mime messages (#1488526)

program/lib/Roundcube/rcube_message.php

@@ -468,6 +468,17 @@ class rcube_message
 
             $this->parts[] = $p;
         }
+        // this is an S/MIME ecrypted message -> create a plaintext body with the according message
+        else if ($mimetype == 'application/pkcs7-mime') {
+            $p = new stdClass;
+            $p->type            = 'content';
+            $p->ctype_primary   = 'text';
+            $p->ctype_secondary = 'plain';
+            $p->mimetype        = 'text/plain';
+            $p->realtype        = 'application/pkcs7-mime';
+
+            $this->parts[] = $p;
+        }
         // message contains multiple parts
         else if (is_array($structure->parts) && !empty($structure->parts)) {
             // iterate over parts

program/steps/mail/func.inc

@@ -1083,9 +1083,9 @@ function rcmail_message_body($attrib)
         $out .= html::div('message-partheaders', rcmail_message_headers(sizeof($header_attrib) ? $header_attrib : null, $part->headers));
       }
       else if ($part->type == 'content') {
-        // unsapported
+        // unsupported (e.g. encrypted)
         if ($part->realtype) {
-          if ($part->realtype == 'multipart/encrypted') {
+          if ($part->realtype == 'multipart/encrypted' || $part->realtype == 'application/pkcs7-mime') {
             $out .= html::span('part-notice', rcube_label('encryptedmessage'));
           }
           continue;