Enigma: Fix error message when trying to encrypt with a revoked private key (#6607)

CHANGELOG

@@ -3,6 +3,7 @@ CHANGELOG Roundcube Webmail
 
 - Managesieve: Fix so "Create filter" option does not show up when Filters menu is disabled (#6723)
 - Enigma: Fix bug where revoked users/keys were not greyed out in key info
+- Enigma: Fix error message when trying to encrypt with a revoked key (#6607)
 - Fix bug where bmp images couldn't be displayed on some systems (#6728)
 - Fix bug in parsing vCard data using PHP 7.3 due to an invalid regexp (#6744)
 

plugins/enigma/lib/enigma_engine.php

@@ -266,10 +266,6 @@ class enigma_engine
             $recipients = array_merge($recipients, $mime->getRecipients());
         }
 
-        if (empty($recipients)) {
-            return new enigma_error(enigma_error::KEYNOTFOUND);
-        }
-
         $recipients = array_unique($recipients);
 
         // find recipient public keys

plugins/enigma/lib/enigma_ui.php

@@ -1100,11 +1100,15 @@ class enigma_ui
 
         if ($mode && ($status instanceof enigma_error)) {
             $code = $status->getCode();
-
             if ($code == enigma_error::KEYNOTFOUND) {
-                $vars = array('email' => $status->getData('missing'));
+                if ($email = $status->getData('missing')) {
+                    $vars = array('email' => $email);
                     $msg  = 'enigma.' . $mode . 'nokey';
                 }
+                else {
+                    $msg = 'enigma.' . ($encrypt_enable ? 'encryptnoprivkey' : 'signnokey');
+                }
+            }
             else if ($code == enigma_error::BADPASS) {
                 $this->password_prompt($status);
             }

plugins/enigma/localization/en_US.inc

@@ -112,6 +112,7 @@ $messages['signbadpass'] = 'Signing failed. Invalid password.';
 $messages['signnopass'] = 'Signing failed. Key password required.';
 $messages['encrypterror'] = 'Encryption failed.';
 $messages['encryptnokey'] = 'Encryption failed. Public key not found for $email.';
+$messages['encryptnoprivkey'] = 'Encryption failed. Private key not found.';
 $messages['nokeysfound'] = 'No keys found';
 $messages['keynotfound'] = 'Key not found!';
 $messages['keyopenerror'] = 'Unable to get key information! Internal error.';