+++ /dev/null
-;;; gnus-nocem.el --- NoCeM pseudo-cancellation treatment
-
-;; Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000 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., 59 Temple Place - Suite 330,
-;; Boston, MA 02111-1307, USA.
-
-;;; Commentary:
-
-;;; Code:
-
-(eval-when-compile (require 'cl))
-(eval-when-compile (require 'gnus-clfns))
-
-(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
- :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 'mc-verify
- "*Function called to verify that the NoCeM message is valid.
-One likely value is `mc-verify'. If the function in this variable
-isn't bound, the message will be used unconditionally."
- :group 'gnus-nocem
- :type '(radio (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 an 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))
-
-(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)))
- (let* ((i 0)
- (check-headers
- (last check-headers gnus-nocem-check-article-limit))
- (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 MESSAGE-----" nil t)
- (delete-region (point-min) (match-beginning 0)))
- (when (re-search-forward "-----END PGP MESSAGE-----\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 "issuer"))
- (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)
- (setq wanted (string-match condition type)))
- ((and (consp condition)
- (eq (car condition) 'not)
- (stringp (cadr condition)))
- (setq wanted (not (string-match (cadr condition) type))))
- (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 (fboundp 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-active-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 (gnus-gethash id gnus-nocem-hashtb)
- ;; 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)))
-
-(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)
-
-;;; gnus-nocem.el ends here
projects / elisp / gnus.git- / blobdiff