No indication of failed encryption

[jech]

Semi doesn't warn when attempting to encrypt to an address with no available key -- it just encrypts to self and sends the mail.

To reproduce:

• draft a mail to an unknown address (e.g. test@example.com)
• C-c C-x h
• C-c C-c

and the mail goes out.

[ikazuhiro]

Please try the below code. You would be asked whether proceed when no available key is found for recipient. Or, set mime-edit-pgp-verbose to t and confirm keys for encryption.

(defun mime-edit-encrypt-pgp-mime (beg end boundary)
  (save-excursion
    (save-restriction
      (let* ((ret (mime-edit-make-encrypt-recipient-header))
             (recipients (car ret))
             (header (cdr ret)))
        (narrow-to-region beg end)
        (let* ((ret
                (mime-edit-translate-region beg end boundary))
               (ctype    (car ret))
               (encoding (nth 1 ret))
               (pgp-boundary (concat "pgp-" boundary))
               (context (epg-make-context))
               cipher)
          (goto-char beg)
          (insert header)
          (insert (format "Content-Type: %s\n" ctype))
          (if encoding
              (insert (format "Content-Transfer-Encoding: %s\n" encoding))
            )
          (insert "\n")
          (mime-encode-header-in-buffer)
          (epg-context-set-armor context t)
          (if mime-edit-pgp-verbose
              (setq recipients
                    (epa-select-keys context "\
Select recipients for encryption.
If no one is selected, symmetric encryption will be performed.  "
                                     recipients))
            (setq recipients
                  (delq
                   nil (mapcar
                        (lambda (name)
                          (or (mime-edit-pgp-keys-valid-key
                               (epg-list-keys context name) 'encrypt)
                              (unless
                                  (y-or-n-p
                                   (format
                                    "No available key for %s, proceed? " name))
                                (signal 'epg-error '(quit)))))
                        recipients))))
          (setq cipher
                (epg-encrypt-string
                 context
                 (buffer-substring (point-min) (point-max))
                 recipients))
          (delete-region (point-min)(point-max))
          (goto-char beg)
          (insert (format "--[[multipart/encrypted;
 boundary=\"%s\";
 protocol=\"application/pgp-encrypted\"][7bit]]
--%s
Content-Type: application/pgp-encrypted

Version: 1

--%s
Content-Type: application/octet-stream
Content-Transfer-Encoding: 7bit

" pgp-boundary pgp-boundary pgp-boundary))
          (insert cipher)
          (goto-char (point-max))
          (insert (format "\n--%s--\n" pgp-boundary))
          )))))