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[Emacs-diffs] Changes to emacs/lisp/gnus/gnus-nocem.el [gnus-5_10-branch
From: |
Andreas Schwab |
Subject: |
[Emacs-diffs] Changes to emacs/lisp/gnus/gnus-nocem.el [gnus-5_10-branch] |
Date: |
Thu, 22 Jul 2004 13:14:13 -0400 |
Index: emacs/lisp/gnus/gnus-nocem.el
diff -c /dev/null emacs/lisp/gnus/gnus-nocem.el:1.10.2.1
*** /dev/null Thu Jul 22 16:46:21 2004
--- emacs/lisp/gnus/gnus-nocem.el Thu Jul 22 16:45:47 2004
***************
*** 0 ****
--- 1,394 ----
+ ;;; gnus-nocem.el --- NoCeM pseudo-cancellation treatment
+
+ ;; Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2002, 2004
+ ;; Free Software Foundation, Inc.
+
+
+ ;; Author: Lars Magne Ingebrigtsen <address@hidden>
+ ;; 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))
+
+ (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]
+ "address@hidden" ; Chris Lewis
+ "cosmo.roadkill"
+ "SpamHippo"
+ "address@hidden")
+ "*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 '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 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))
+
+ (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-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 (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)
+
+ ;;; arch-tag: 0e0c74ea-2f8e-4f3e-8fff-09f767c1adef
+ ;;; gnus-nocem.el ends here
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