[patch] 21.3 add-log.el::add-log-mailing-address security (spam)

[Jari Aalto+mail.linux]

The following change will help selecting more appropriate default for
displayed identity in ChangeLogs. This helps fighting against spam
harversters by not letting then simply rip out all that looks like
"@". This is naturally tip of the iceberg, but I believe any measure
to improve security should be included in Emacs as well.

2004-04-04  Jari Aalto  <jari dot aalto _A@T_ poboxes dot com>

        * add-log.el (add-log-mailing-address): Refer to
        `add-log-user-mail-address' and suggest email 
        addrress that prevents spam.
        (add-log-user-mail-address): New. Spam protect
        `user-mail-address'.
        (add-change-log-entry): Use `add-log-user-mail-address'.

Index: add-log.el
===================================================================
RCS file: 
/cygdrive/h/data/version-control/cvsroot/emacs/gnu-emacs/lisp213/add-log.el,v
retrieving revision 1.1
retrieving revision 1.2
diff -u -IId: -c -r1.1 -r1.2
cvs diff: conflicting specifications of output style
*** add-log.el  26 Jun 2003 18:06:05 -0000      1.1
--- add-log.el  4 Apr 2004 14:00:16 -0000       1.2
***************
*** 68,74 ****
  ;;;###autoload
  (defcustom add-log-mailing-address nil
    "*Electronic mail address of user, for inclusion in ChangeLog daily headers.
! This defaults to the value of `user-mail-address'."
    :type '(choice (const :tag "Default" nil)
                 string)
    :group 'change-log)
--- 68,79 ----
  ;;;###autoload
  (defcustom add-log-mailing-address nil
    "*Electronic mail address of user, for inclusion in ChangeLog daily headers.
! This defaults to the value of function `add-log-user-mail-address'.
! If you set this yourself, consider using some Spam protected email format, 
! which could be: 
! 
!     john.doe _A T_ example.com
!     john DOT doe _AT_ example DOT com"
    :type '(choice (const :tag "Default" nil)
                 string)
    :group 'change-log)
***************
*** 400,405 ****
--- 405,418 ----
          (file-name-sans-versions buffer-file)
        buffer-file))))
  
+ (defun add-log-user-mail-address ()
+   "Return protected version of `user-rmail-address'."
+   (and (stringp user-mail-address)
+        (string-match "@" user-mail-address)
+        ;;  ' AT ' is too common, so use something else to 
+        ;;  make Unsolicited bulk email (spam) harvester's work harder.
+        (replace-match " _A T_ " nil nil user-mail-address)))
+ 
  ;;;###autoload
  (defun add-change-log-entry (&optional whoami file-name other-window 
new-entry)
    "Find change log file and add an entry for today.
***************
*** 419,425 ****
    (or add-log-full-name
        (setq add-log-full-name (user-full-name)))
    (or add-log-mailing-address
!       (setq add-log-mailing-address user-mail-address))
    (if whoami
        (progn
        (setq add-log-full-name (read-input "Full name: " add-log-full-name))
--- 432,439 ----
    (or add-log-full-name
        (setq add-log-full-name (user-full-name)))
    (or add-log-mailing-address
!       (setq add-log-mailing-address 
!           (add-log-user-mail-address)))
    (if whoami
        (progn
        (setq add-log-full-name (read-input "Full name: " add-log-full-name))





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