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|
;;; gnus-nocem.el --- NoCeM pseudo-cancellation treatment
;; Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
;; 2005, 2006 Free Software Foundation, Inc.
;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
;; Keywords: news
;; This file is part of GNU Emacs.
;; GNU Emacs is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 2, or (at your option)
;; any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs; see the file COPYING. If not, write to the
;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.
;;; Commentary:
;;; Code:
(eval-when-compile (require 'cl))
(require 'gnus)
(require 'nnmail)
(require 'gnus-art)
(require 'gnus-sum)
(require 'gnus-range)
(defgroup gnus-nocem nil
"NoCeM pseudo-cancellation treatment."
:group 'gnus-score)
(defcustom gnus-nocem-groups
'("news.lists.filters" "news.admin.net-abuse.bulletins"
"alt.nocem.misc" "news.admin.net-abuse.announce")
"*List of groups that will be searched for NoCeM messages."
:group 'gnus-nocem
:type '(repeat (string :tag "Group")))
(defcustom gnus-nocem-issuers
'("AutoMoose-1" ; CancelMoose[tm]
"clewis@ferret.ocunix" ; Chris Lewis
"cosmo.roadkill"
"SpamHippo"
"hweede@snafu.de")
"*List of NoCeM issuers to pay attention to.
This can also be a list of `(ISSUER CONDITION ...)' elements.
See <URL:http://www.xs4all.nl/~rosalind/nocemreg/nocemreg.html> for an
issuer registry."
:group 'gnus-nocem
:link '(url-link "http://www.xs4all.nl/~rosalind/nocemreg/nocemreg.html")
:type '(repeat (choice string sexp)))
(defcustom gnus-nocem-directory
(nnheader-concat gnus-article-save-directory "NoCeM/")
"*Directory where NoCeM files will be stored."
:group 'gnus-nocem
:type 'directory)
(defcustom gnus-nocem-expiry-wait 15
"*Number of days to keep NoCeM headers in the cache."
:group 'gnus-nocem
:type 'integer)
(defcustom gnus-nocem-verifyer 'pgg-verify
"*Function called to verify that the NoCeM message is valid.
One likely value is `pgg-verify'. If the function in this variable
isn't bound, the message will be used unconditionally."
:group 'gnus-nocem
:type '(radio (function-item pgg-verify)
(function-item mc-verify)
(function :tag "other")))
(defcustom gnus-nocem-liberal-fetch nil
"*If t try to fetch all messages which have @@NCM in the subject.
Otherwise don't fetch messages which have references or whose message-id
matches a previously scanned and verified nocem message."
:group 'gnus-nocem
:type 'boolean)
(defcustom gnus-nocem-check-article-limit 500
"*If non-nil, the maximum number of articles to check in any NoCeM group."
:group 'gnus-nocem
:version "21.1"
:type '(choice (const :tag "unlimited" nil)
(integer 1000)))
(defcustom gnus-nocem-check-from t
"Non-nil means check for valid issuers in message bodies.
Otherwise don't bother fetching articles unless their author matches a
valid issuer, which is much faster if you are selective about the issuers."
:group 'gnus-nocem
:version "21.1"
:type 'boolean)
;;; Internal variables
(defvar gnus-nocem-active nil)
(defvar gnus-nocem-alist nil)
(defvar gnus-nocem-touched-alist nil)
(defvar gnus-nocem-hashtb nil)
(defvar gnus-nocem-seen-message-ids nil)
;;; Functions
(defun gnus-nocem-active-file ()
(concat (file-name-as-directory gnus-nocem-directory) "active"))
(defun gnus-nocem-cache-file ()
(concat (file-name-as-directory gnus-nocem-directory) "cache"))
;;
;; faster lookups for group names:
;;
(defvar gnus-nocem-real-group-hashtb nil
"Real-name mappings of subscribed groups.")
(defun gnus-fill-real-hashtb ()
"Fill up a hash table with the real-name mappings from the user's active file."
(setq gnus-nocem-real-group-hashtb (gnus-make-hashtable
(length gnus-newsrc-alist)))
(mapcar (lambda (group)
(setq group (gnus-group-real-name (car group)))
(gnus-sethash group t gnus-nocem-real-group-hashtb))
gnus-newsrc-alist))
;;;###autoload
(defun gnus-nocem-scan-groups ()
"Scan all NoCeM groups for new NoCeM messages."
(interactive)
(let ((groups gnus-nocem-groups)
(gnus-inhibit-demon t)
group active gactive articles check-headers)
(gnus-make-directory gnus-nocem-directory)
;; Load any previous NoCeM headers.
(gnus-nocem-load-cache)
;; Get the group name mappings:
(gnus-fill-real-hashtb)
;; Read the active file if it hasn't been read yet.
(and (file-exists-p (gnus-nocem-active-file))
(not gnus-nocem-active)
(ignore-errors
(load (gnus-nocem-active-file) t t t)))
;; Go through all groups and see whether new articles have
;; arrived.
(while (setq group (pop groups))
(if (not (setq gactive (gnus-activate-group group)))
() ; This group doesn't exist.
(setq active (nth 1 (assoc group gnus-nocem-active)))
(when (and (not (< (cdr gactive) (car gactive))) ; Empty group.
(or (not active)
(< (cdr active) (cdr gactive))))
;; Ok, there are new articles in this group, se we fetch the
;; headers.
(save-excursion
(let ((dependencies (make-vector 10 nil))
headers header)
(with-temp-buffer
(setq headers
(if (eq 'nov
(gnus-retrieve-headers
(setq articles
(gnus-uncompress-range
(cons
(if active (1+ (cdr active))
(car gactive))
(cdr gactive))))
group))
(gnus-get-newsgroup-headers-xover
articles nil dependencies)
(gnus-get-newsgroup-headers dependencies)))
(while (setq header (pop headers))
;; We take a closer look on all articles that have
;; "@@NCM" in the subject. Unless we already read
;; this cross posted message. Nocem messages
;; are not allowed to have references, so we can
;; ignore scanning followups.
(and (string-match "@@NCM" (mail-header-subject header))
(and gnus-nocem-check-from
(let ((case-fold-search t))
(catch 'ok
(mapcar
(lambda (author)
(if (consp author)
(setq author (car author)))
(if (string-match
author (mail-header-from header))
(throw 'ok t)))
gnus-nocem-issuers)
nil)))
(or gnus-nocem-liberal-fetch
(and (or (string= "" (mail-header-references
header))
(null (mail-header-references header)))
(not (member (mail-header-message-id header)
gnus-nocem-seen-message-ids))))
(push header check-headers)))
(setq check-headers (last (nreverse check-headers)
gnus-nocem-check-article-limit))
(let ((i 0)
(len (length check-headers)))
(dolist (h check-headers)
(gnus-message
7 "Checking article %d in %s for NoCeM (%d of %d)..."
(mail-header-number h) group (incf i) len)
(gnus-nocem-check-article group h)))))))
(setq gnus-nocem-active
(cons (list group gactive)
(delq (assoc group gnus-nocem-active)
gnus-nocem-active)))))
;; Save the results, if any.
(gnus-nocem-save-cache)
(gnus-nocem-save-active)))
(defun gnus-nocem-check-article (group header)
"Check whether the current article is an NCM article and that we want it."
;; Get the article.
(let ((date (mail-header-date header))
(gnus-newsgroup-name group)
issuer b e type)
(when (or (not date)
(time-less-p
(time-since (date-to-time date))
(days-to-time gnus-nocem-expiry-wait)))
(gnus-request-article-this-buffer (mail-header-number header) group)
(goto-char (point-min))
(when (re-search-forward
"-----BEGIN PGP\\( SIGNED\\)? MESSAGE-----"
nil t)
(delete-region (point-min) (match-beginning 0)))
(when (re-search-forward
"-----END PGP \\(MESSAGE\\|SIGNATURE\\)-----\n?"
nil t)
(delete-region (match-end 0) (point-max)))
(goto-char (point-min))
;; The article has to have proper NoCeM headers.
(when (and (setq b (search-forward "\n@@BEGIN NCM HEADERS\n" nil t))
(setq e (search-forward "\n@@BEGIN NCM BODY\n" nil t)))
;; We get the name of the issuer.
(narrow-to-region b e)
(setq issuer (mail-fetch-field "issuer")
type (mail-fetch-field "type"))
(widen)
(if (not (gnus-nocem-message-wanted-p issuer type))
(message "invalid NoCeM issuer: %s" issuer)
(and (gnus-nocem-verify-issuer issuer) ; She is who she says she is.
(gnus-nocem-enter-article) ; We gobble the message.
(push (mail-header-message-id header) ; But don't come back for
gnus-nocem-seen-message-ids))))))) ; second helpings.
(defun gnus-nocem-message-wanted-p (issuer type)
(let ((issuers gnus-nocem-issuers)
wanted conditions condition)
(cond
;; Do the quick check first.
((member issuer issuers)
t)
((setq conditions (cdr (assoc issuer issuers)))
;; Check whether we want this type.
(while (setq condition (pop conditions))
(cond
((stringp condition)
(when (string-match condition type)
(setq wanted t)))
((and (consp condition)
(eq (car condition) 'not)
(stringp (cadr condition)))
(when (string-match (cadr condition) type)
(setq wanted nil)))
(t
(error "Invalid NoCeM condition: %S" condition))))
wanted))))
(defun gnus-nocem-verify-issuer (person)
"Verify using PGP that the canceler is who she says she is."
(if (functionp gnus-nocem-verifyer)
(ignore-errors
(funcall gnus-nocem-verifyer))
;; If we don't have Mailcrypt, then we use the message anyway.
t))
(defun gnus-nocem-enter-article ()
"Enter the current article into the NoCeM cache."
(goto-char (point-min))
(let ((b (search-forward "\n@@BEGIN NCM BODY\n" nil t))
(e (search-forward "\n@@END NCM BODY\n" nil t))
(buf (current-buffer))
ncm id group)
(when (and b e)
(narrow-to-region b (1+ (match-beginning 0)))
(goto-char (point-min))
(while (search-forward "\t" nil t)
(cond
((not (ignore-errors
(setq group (let ((obarray gnus-nocem-real-group-hashtb))
(read buf)))))
;; An error.
)
((not (symbolp group))
;; Ignore invalid entries.
)
((not (boundp group))
;; Make sure all entries in the hashtb are bound.
(set group nil))
(t
(when (gnus-gethash (gnus-group-real-name (symbol-name group))
gnus-nocem-real-group-hashtb)
;; Valid group.
(beginning-of-line)
(while (eq (char-after) ?\t)
(forward-line -1))
(setq id (buffer-substring (point) (1- (search-forward "\t"))))
(unless (if gnus-nocem-hashtb
(gnus-gethash id gnus-nocem-hashtb)
(setq gnus-nocem-hashtb (gnus-make-hashtable))
nil)
;; only store if not already present
(gnus-sethash id t gnus-nocem-hashtb)
(push id ncm))
(forward-line 1)
(while (eq (char-after) ?\t)
(forward-line 1))))))
(when ncm
(setq gnus-nocem-touched-alist t)
(push (cons (let ((time (current-time))) (setcdr (cdr time) nil) time)
ncm)
gnus-nocem-alist))
t)))
;;;###autoload
(defun gnus-nocem-load-cache ()
"Load the NoCeM cache."
(interactive)
(unless gnus-nocem-alist
;; The buffer doesn't exist, so we create it and load the NoCeM
;; cache.
(when (file-exists-p (gnus-nocem-cache-file))
(load (gnus-nocem-cache-file) t t t)
(gnus-nocem-alist-to-hashtb))))
(defun gnus-nocem-save-cache ()
"Save the NoCeM cache."
(when (and gnus-nocem-alist
gnus-nocem-touched-alist)
(with-temp-file (gnus-nocem-cache-file)
(gnus-prin1 `(setq gnus-nocem-alist ',gnus-nocem-alist)))
(setq gnus-nocem-touched-alist nil)))
(defun gnus-nocem-save-active ()
"Save the NoCeM active file."
(with-temp-file (gnus-nocem-active-file)
(gnus-prin1 `(setq gnus-nocem-active ',gnus-nocem-active))))
(defun gnus-nocem-alist-to-hashtb ()
"Create a hashtable from the Message-IDs we have."
(let* ((alist gnus-nocem-alist)
(pprev (cons nil alist))
(prev pprev)
(expiry (days-to-time gnus-nocem-expiry-wait))
entry)
(setq gnus-nocem-hashtb (gnus-make-hashtable (* (length alist) 51)))
(while (setq entry (car alist))
(if (not (time-less-p (time-since (car entry)) expiry))
;; This entry has expired, so we remove it.
(setcdr prev (cdr alist))
(setq prev alist)
;; This is ok, so we enter it into the hashtable.
(setq entry (cdr entry))
(while entry
(gnus-sethash (car entry) t gnus-nocem-hashtb)
(setq entry (cdr entry))))
(setq alist (cdr alist)))))
(gnus-add-shutdown 'gnus-nocem-close 'gnus)
(defun gnus-nocem-close ()
"Clear internal NoCeM variables."
(setq gnus-nocem-alist nil
gnus-nocem-hashtb nil
gnus-nocem-active nil
gnus-nocem-touched-alist nil
gnus-nocem-seen-message-ids nil
gnus-nocem-real-group-hashtb nil))
(defun gnus-nocem-unwanted-article-p (id)
"Say whether article ID in the current group is wanted."
(and gnus-nocem-hashtb
(gnus-gethash id gnus-nocem-hashtb)))
(provide 'gnus-nocem)
;;; arch-tag: 0e0c74ea-2f8e-4f3e-8fff-09f767c1adef
;;; gnus-nocem.el ends here
|
