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248 lines
8.4 KiB
EmacsLisp
248 lines
8.4 KiB
EmacsLisp
;;; gnus-nocem.el --- NoCeM pseudo-cancellation treatment
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;; Copyright (C) 1995,96 Free Software Foundation, Inc.
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;; Author: Lars Magne Ingebrigtsen <larsi@ifi.uio.no>
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;; Keywords: news
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 2, or (at your option)
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;; any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs; see the file COPYING. If not, write to the
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;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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;; Boston, MA 02111-1307, USA.
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;;; Commentary:
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;;; Code:
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(require 'gnus)
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(require 'nnmail)
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(eval-when-compile (require 'cl))
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(defvar gnus-nocem-groups
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'("alt.nocem.misc" "news.admin.net-abuse.announce")
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"*List of groups that will be searched for NoCeM messages.")
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(defvar gnus-nocem-issuers
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'("Automoose-1" ; The CancelMoose[tm] on autopilot.
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"clewis@ferret.ocunix.on.ca;" ; Chris Lewis -- Canadian angel & despammer.
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"jem@xpat.com;" ; John Milburn -- despammer in Korea.
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"red@redpoll.mrfs.oh.us (Richard E. Depew)" ; Spew/bincancel guy.
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)
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"*List of NoCeM issuers to pay attention to.")
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(defvar gnus-nocem-directory
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(concat (file-name-as-directory gnus-article-save-directory) "NoCeM/")
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"*Directory where NoCeM files will be stored.")
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(defvar gnus-nocem-expiry-wait 15
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"*Number of days to keep NoCeM headers in the cache.")
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(defvar gnus-nocem-verifyer nil
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"*Function called to verify that the NoCeM message is valid.
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One likely value is `mc-verify'. If the function in this variable
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isn't bound, the message will be used unconditionally.")
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;;; Internal variables
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(defvar gnus-nocem-active nil)
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(defvar gnus-nocem-alist nil)
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(defvar gnus-nocem-touched-alist nil)
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(defvar gnus-nocem-hashtb nil)
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;;; Functions
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(defun gnus-nocem-active-file ()
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(concat (file-name-as-directory gnus-nocem-directory) "active"))
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(defun gnus-nocem-cache-file ()
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(concat (file-name-as-directory gnus-nocem-directory) "cache"))
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(defun gnus-nocem-scan-groups ()
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"Scan all NoCeM groups for new NoCeM messages."
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(interactive)
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(let ((groups gnus-nocem-groups)
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group active gactive articles)
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(or (file-exists-p gnus-nocem-directory)
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(make-directory gnus-nocem-directory t))
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;; Load any previous NoCeM headers.
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(gnus-nocem-load-cache)
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;; Read the active file if it hasn't been read yet.
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(and (file-exists-p (gnus-nocem-active-file))
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(not gnus-nocem-active)
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(condition-case ()
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(load (gnus-nocem-active-file) t t t)
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(error nil)))
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;; Go through all groups and see whether new articles have
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;; arrived.
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(while (setq group (pop groups))
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(if (not (setq gactive (gnus-activate-group group)))
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() ; This group doesn't exist.
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(setq active (nth 1 (assoc group gnus-nocem-active)))
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(when (and (not (< (cdr gactive) (car gactive))) ; Empty group.
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(or (not active)
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(< (cdr active) (cdr gactive))))
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;; Ok, there are new articles in this group, se we fetch the
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;; headers.
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(save-excursion
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(let ((dependencies (make-vector 10 nil))
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(buffer (nnheader-set-temp-buffer " *Gnus NoCeM*"))
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headers)
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(setq headers
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(if (eq 'nov
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(gnus-retrieve-headers
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(setq articles
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(gnus-uncompress-range
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(cons
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(if active (1+ (cdr active))
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(car gactive))
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(cdr gactive))))
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group))
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(gnus-get-newsgroup-headers-xover
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articles nil dependencies)
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(gnus-get-newsgroup-headers dependencies)))
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(while headers
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;; We take a closer look on all articles that have
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;; "@@NCM" in the subject.
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(when (string-match "@@NCM"
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(mail-header-subject (car headers)))
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(gnus-nocem-check-article group (car headers)))
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(setq headers (cdr headers)))
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(kill-buffer (current-buffer)))))
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(setq gnus-nocem-active
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(cons (list group gactive)
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(delq (assoc group gnus-nocem-active)
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gnus-nocem-active)))))
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;; Save the results, if any.
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(gnus-nocem-save-cache)
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(gnus-nocem-save-active)))
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(defun gnus-nocem-check-article (group header)
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"Check whether the current article is an NCM article and that we want it."
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;; Get the article.
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(gnus-message 7 "Checking article %d in %s for NoCeM..."
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(mail-header-number header) group)
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(let ((date (mail-header-date header))
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issuer b e)
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(when (or (not date)
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(nnmail-time-less
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(nnmail-time-since (nnmail-date-to-time date))
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(nnmail-days-to-time gnus-nocem-expiry-wait)))
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(gnus-request-article-this-buffer (mail-header-number header) group)
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(goto-char (point-min))
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;; The article has to have proper NoCeM headers.
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(when (and (setq b (search-forward "\n@@BEGIN NCM HEADERS\n" nil t))
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(setq e (search-forward "\n@@BEGIN NCM BODY\n" nil t)))
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;; We get the name of the issuer.
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(narrow-to-region b e)
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(setq issuer (mail-fetch-field "issuer"))
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(and (member issuer gnus-nocem-issuers) ; We like her...
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(gnus-nocem-verify-issuer issuer) ; She is who she says she is..
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(gnus-nocem-enter-article)))))) ; We gobble the message.
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(defun gnus-nocem-verify-issuer (person)
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"Verify using PGP that the canceler is who she says she is."
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(widen)
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(if (fboundp gnus-nocem-verifyer)
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(funcall gnus-nocem-verifyer)
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;; If we don't have MailCrypt, then we use the message anyway.
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t))
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(defun gnus-nocem-enter-article ()
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"Enter the current article into the NoCeM cache."
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(goto-char (point-min))
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(let ((b (search-forward "\n@@BEGIN NCM BODY\n" nil t))
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(e (search-forward "\n@@END NCM BODY\n" nil t))
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(buf (current-buffer))
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ncm id)
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(when (and b e)
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(narrow-to-region b (1+ (match-beginning 0)))
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(goto-char (point-min))
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(while (search-forward "\t" nil t)
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(when (condition-case nil
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(boundp (let ((obarray gnus-active-hashtb)) (read buf)))
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(error nil))
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(beginning-of-line)
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(while (= (following-char) ?\t)
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(forward-line -1))
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(setq id (buffer-substring (point) (1- (search-forward "\t"))))
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(push id ncm)
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(gnus-sethash id t gnus-nocem-hashtb)
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(forward-line 1)
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(while (= (following-char) ?\t)
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(forward-line 1))))
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(when ncm
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(setq gnus-nocem-touched-alist t)
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(push (cons (let ((time (current-time))) (setcdr (cdr time) nil) time)
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ncm)
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gnus-nocem-alist)))))
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(defun gnus-nocem-load-cache ()
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"Load the NoCeM cache."
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(unless gnus-nocem-alist
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;; The buffer doesn't exist, so we create it and load the NoCeM
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;; cache.
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(when (file-exists-p (gnus-nocem-cache-file))
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(load (gnus-nocem-cache-file) t t t)
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(gnus-nocem-alist-to-hashtb))))
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(defun gnus-nocem-save-cache ()
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"Save the NoCeM cache."
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(when (and gnus-nocem-alist
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gnus-nocem-touched-alist)
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(nnheader-temp-write (gnus-nocem-cache-file)
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(prin1 `(setq gnus-nocem-alist ',gnus-nocem-alist) (current-buffer)))
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(setq gnus-nocem-touched-alist nil)))
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(defun gnus-nocem-save-active ()
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"Save the NoCeM active file."
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(nnheader-temp-write (gnus-nocem-active-file)
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(prin1 `(setq gnus-nocem-active ',gnus-nocem-active) (current-buffer))))
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(defun gnus-nocem-alist-to-hashtb ()
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"Create a hashtable from the Message-IDs we have."
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(let* ((alist gnus-nocem-alist)
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(pprev (cons nil alist))
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(prev pprev)
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(expiry (nnmail-days-to-time gnus-nocem-expiry-wait))
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entry)
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(setq gnus-nocem-hashtb (gnus-make-hashtable (* (length alist) 51)))
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(while (setq entry (car alist))
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(if (not (nnmail-time-less (nnmail-time-since (car entry)) expiry))
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;; This entry has expired, so we remove it.
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(setcdr prev (cdr alist))
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(setq prev alist)
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;; This is ok, so we enter it into the hashtable.
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(setq entry (cdr entry))
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(while entry
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(gnus-sethash (car entry) t gnus-nocem-hashtb)
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(setq entry (cdr entry))))
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(setq alist (cdr alist)))))
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(gnus-add-shutdown 'gnus-nocem-close 'gnus)
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(defun gnus-nocem-close ()
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"Clear internal NoCeM variables."
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(setq gnus-nocem-alist nil
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gnus-nocem-hashtb nil
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gnus-nocem-active nil
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gnus-nocem-touched-alist nil))
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(defun gnus-nocem-unwanted-article-p (id)
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"Say whether article ID in the current group is wanted."
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(gnus-gethash id gnus-nocem-hashtb))
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(provide 'gnus-nocem)
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;;; gnus-nocem.el ends here
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