Re: display "[cid]" images inline?

[Katsumi Yamaoka]

>>>>> In <mailman.47.1162439843.2155.info-gnus-english@gnu.org>
>>>>>   William Xu wrote:

>| (setq mm-inline-text-html-with-images t
>|       w3m-safe-url-regexp nil)

Setting `w3m-safe-url-regexp' to nil is generally dangerous.
Here is an extract from the emacs-w3m Info manual:

,----[ (info "(emacs-w3m)Gnus") ]
|* Notes
|
|  The above description about spam and ham is not for kidding, it's
|  just here to get your attention.  Some HTML mails might contain a
|  nasty trick used by spammers, using the `<img>' tag which is far
|  more evil than the `Click Here!' button.  It is most likely
|  intended to check whether the ominous spam mail has reached your
|  eyes or not, in which case the spammer knows for sure that your
|  email address is valid.  It is done by embedding an identifier
|  string into a URL that you might automatically retrieve when
|  displaying the image.  If the `mm-w3m-safe-url-regexp' variable
|  has not been changed from the default value, Gnus will never
|  connect to the spammer's site arbitrarily.
|
|  You can display images inline in an article buffer if you set
|  `mm-inline-text-html-with-images' to `t', can't you?  No, not
|  exactly: you're still being protected.  If you don't care about
|  leaking information (i.e. the fact that your mail address is
|  reachable), set the `mm-w3m-safe-url-regexp' variable to `nil'.
|  The default value for `mm-w3m-safe-url-regexp' is `"\\`cid:"'
|  which means we consider that images included in a mail with the
|  `cid:' URL are safe (that is, you can display such images without
|  modifying the `mm-w3m-safe-url-regexp' variable).
|
|* Giveaway
|
|  Even when you are in the summary buffer, you can toggle displaying
|  of images in the article buffer.  It is effective only when those
|  images are displayed by emacs-w3m, though.  Here's an example:
|
|       (defun gnus-summary-w3m-safe-toggle-inline-images (&optional arg)
|         "Toggle displaying of all images in the article buffer.
|       If the prefix arg is given, all images are considered to be safe."
|         (interactive "P")
|         (save-excursion
|           (set-buffer gnus-article-buffer)
|           (w3m-safe-toggle-inline-images arg)))
|
|       (eval-after-load "gnus-sum"
|         '(define-key gnus-summary-mode-map
|            "\C-i" 'gnus-summary-w3m-safe-toggle-inline-images))
`----