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526baa41 LMI |
1 | ;;; gnus-nocem.el --- NoCeM pseudo-cancellation treatment |
2 | ;; Copyright (C) 1995,96 Free Software Foundation, Inc. | |
3 | ||
4 | ;; Author: Lars Magne Ingebrigtsen <larsi@ifi.uio.no> | |
5 | ;; Keywords: news | |
6 | ||
7 | ;; This file is part of GNU Emacs. | |
8 | ||
9 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
10 | ;; it under the terms of the GNU General Public License as published by | |
11 | ;; the Free Software Foundation; either version 2, or (at your option) | |
12 | ;; any later version. | |
13 | ||
14 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
15 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | ;; GNU General Public License for more details. | |
18 | ||
19 | ;; You should have received a copy of the GNU General Public License | |
20 | ;; along with GNU Emacs; see the file COPYING. If not, write to the | |
21 | ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
22 | ;; Boston, MA 02111-1307, USA. | |
23 | ||
24 | ;;; Commentary: | |
25 | ||
26 | ;;; Code: | |
27 | ||
28 | (require 'gnus) | |
29 | (require 'nnmail) | |
30 | (eval-when-compile (require 'cl)) | |
31 | ||
32 | (defvar gnus-nocem-groups | |
33 | '("alt.nocem.misc" "news.admin.net-abuse.announce") | |
34 | "*List of groups that will be searched for NoCeM messages.") | |
35 | ||
36 | (defvar gnus-nocem-issuers | |
37 | '("Automoose-1" ; The CancelMoose[tm] on autopilot. | |
38 | "clewis@ferret.ocunix.on.ca;" ; Chris Lewis -- Canadian angel & despammer. | |
39 | "jem@xpat.com;" ; John Milburn -- despammer in Korea. | |
40 | "red@redpoll.mrfs.oh.us (Richard E. Depew)" ; Spew/bincancel guy. | |
41 | ) | |
42 | "*List of NoCeM issuers to pay attention to.") | |
43 | ||
44 | (defvar gnus-nocem-directory | |
45 | (concat (file-name-as-directory gnus-article-save-directory) "NoCeM/") | |
46 | "*Directory where NoCeM files will be stored.") | |
47 | ||
48 | (defvar gnus-nocem-expiry-wait 15 | |
49 | "*Number of days to keep NoCeM headers in the cache.") | |
50 | ||
51 | (defvar gnus-nocem-verifyer nil | |
52 | "*Function called to verify that the NoCeM message is valid. | |
53 | One likely value is `mc-verify'. If the function in this variable | |
54 | isn't bound, the message will be used unconditionally.") | |
55 | ||
56 | ;;; Internal variables | |
57 | ||
58 | (defvar gnus-nocem-active nil) | |
59 | (defvar gnus-nocem-alist nil) | |
60 | (defvar gnus-nocem-touched-alist nil) | |
61 | (defvar gnus-nocem-hashtb nil) | |
62 | ||
63 | ;;; Functions | |
64 | ||
65 | (defun gnus-nocem-active-file () | |
66 | (concat (file-name-as-directory gnus-nocem-directory) "active")) | |
67 | ||
68 | (defun gnus-nocem-cache-file () | |
69 | (concat (file-name-as-directory gnus-nocem-directory) "cache")) | |
70 | ||
71 | (defun gnus-nocem-scan-groups () | |
72 | "Scan all NoCeM groups for new NoCeM messages." | |
73 | (interactive) | |
74 | (let ((groups gnus-nocem-groups) | |
75 | group active gactive articles) | |
76 | (or (file-exists-p gnus-nocem-directory) | |
77 | (make-directory gnus-nocem-directory t)) | |
78 | ;; Load any previous NoCeM headers. | |
79 | (gnus-nocem-load-cache) | |
80 | ;; Read the active file if it hasn't been read yet. | |
81 | (and (file-exists-p (gnus-nocem-active-file)) | |
82 | (not gnus-nocem-active) | |
83 | (condition-case () | |
84 | (load (gnus-nocem-active-file) t t t) | |
85 | (error nil))) | |
86 | ;; Go through all groups and see whether new articles have | |
87 | ;; arrived. | |
88 | (while (setq group (pop groups)) | |
89 | (if (not (setq gactive (gnus-activate-group group))) | |
90 | () ; This group doesn't exist. | |
91 | (setq active (nth 1 (assoc group gnus-nocem-active))) | |
92 | (when (and (not (< (cdr gactive) (car gactive))) ; Empty group. | |
93 | (or (not active) | |
94 | (< (cdr active) (cdr gactive)))) | |
95 | ;; Ok, there are new articles in this group, se we fetch the | |
96 | ;; headers. | |
97 | (save-excursion | |
98 | (let ((dependencies (make-vector 10 nil)) | |
99 | (buffer (nnheader-set-temp-buffer " *Gnus NoCeM*")) | |
100 | headers) | |
101 | (setq headers | |
102 | (if (eq 'nov | |
103 | (gnus-retrieve-headers | |
104 | (setq articles | |
105 | (gnus-uncompress-range | |
106 | (cons | |
107 | (if active (1+ (cdr active)) | |
108 | (car gactive)) | |
109 | (cdr gactive)))) | |
110 | group)) | |
111 | (gnus-get-newsgroup-headers-xover | |
112 | articles nil dependencies) | |
113 | (gnus-get-newsgroup-headers dependencies))) | |
114 | (while headers | |
115 | ;; We take a closer look on all articles that have | |
116 | ;; "@@NCM" in the subject. | |
117 | (when (string-match "@@NCM" | |
118 | (mail-header-subject (car headers))) | |
119 | (gnus-nocem-check-article group (car headers))) | |
120 | (setq headers (cdr headers))) | |
121 | (kill-buffer (current-buffer))))) | |
122 | (setq gnus-nocem-active | |
123 | (cons (list group gactive) | |
124 | (delq (assoc group gnus-nocem-active) | |
125 | gnus-nocem-active))))) | |
126 | ;; Save the results, if any. | |
127 | (gnus-nocem-save-cache) | |
128 | (gnus-nocem-save-active))) | |
129 | ||
130 | (defun gnus-nocem-check-article (group header) | |
131 | "Check whether the current article is an NCM article and that we want it." | |
132 | ;; Get the article. | |
133 | (gnus-message 7 "Checking article %d in %s for NoCeM..." | |
134 | (mail-header-number header) group) | |
135 | (let ((date (mail-header-date header)) | |
136 | issuer b e) | |
137 | (when (or (not date) | |
138 | (nnmail-time-less | |
139 | (nnmail-time-since (nnmail-date-to-time date)) | |
140 | (nnmail-days-to-time gnus-nocem-expiry-wait))) | |
141 | (gnus-request-article-this-buffer (mail-header-number header) group) | |
c4c7f54c | 142 | (goto-char (point-min)) |
526baa41 LMI |
143 | ;; The article has to have proper NoCeM headers. |
144 | (when (and (setq b (search-forward "\n@@BEGIN NCM HEADERS\n" nil t)) | |
145 | (setq e (search-forward "\n@@BEGIN NCM BODY\n" nil t))) | |
146 | ;; We get the name of the issuer. | |
147 | (narrow-to-region b e) | |
148 | (setq issuer (mail-fetch-field "issuer")) | |
149 | (and (member issuer gnus-nocem-issuers) ; We like her... | |
150 | (gnus-nocem-verify-issuer issuer) ; She is who she says she is.. | |
151 | (gnus-nocem-enter-article)))))) ; We gobble the message. | |
152 | ||
153 | (defun gnus-nocem-verify-issuer (person) | |
154 | "Verify using PGP that the canceler is who she says she is." | |
155 | (widen) | |
156 | (if (fboundp gnus-nocem-verifyer) | |
157 | (funcall gnus-nocem-verifyer) | |
158 | ;; If we don't have MailCrypt, then we use the message anyway. | |
159 | t)) | |
160 | ||
161 | (defun gnus-nocem-enter-article () | |
162 | "Enter the current article into the NoCeM cache." | |
163 | (goto-char (point-min)) | |
164 | (let ((b (search-forward "\n@@BEGIN NCM BODY\n" nil t)) | |
165 | (e (search-forward "\n@@END NCM BODY\n" nil t)) | |
166 | (buf (current-buffer)) | |
167 | ncm id) | |
168 | (when (and b e) | |
169 | (narrow-to-region b (1+ (match-beginning 0))) | |
170 | (goto-char (point-min)) | |
171 | (while (search-forward "\t" nil t) | |
172 | (when (condition-case nil | |
173 | (boundp (let ((obarray gnus-active-hashtb)) (read buf))) | |
174 | (error nil)) | |
175 | (beginning-of-line) | |
176 | (while (= (following-char) ?\t) | |
177 | (forward-line -1)) | |
178 | (setq id (buffer-substring (point) (1- (search-forward "\t")))) | |
179 | (push id ncm) | |
180 | (gnus-sethash id t gnus-nocem-hashtb) | |
181 | (forward-line 1) | |
182 | (while (= (following-char) ?\t) | |
183 | (forward-line 1)))) | |
184 | (when ncm | |
185 | (setq gnus-nocem-touched-alist t) | |
186 | (push (cons (let ((time (current-time))) (setcdr (cdr time) nil) time) | |
187 | ncm) | |
188 | gnus-nocem-alist))))) | |
189 | ||
190 | (defun gnus-nocem-load-cache () | |
191 | "Load the NoCeM cache." | |
192 | (unless gnus-nocem-alist | |
193 | ;; The buffer doesn't exist, so we create it and load the NoCeM | |
194 | ;; cache. | |
195 | (when (file-exists-p (gnus-nocem-cache-file)) | |
196 | (load (gnus-nocem-cache-file) t t t) | |
197 | (gnus-nocem-alist-to-hashtb)))) | |
198 | ||
199 | (defun gnus-nocem-save-cache () | |
200 | "Save the NoCeM cache." | |
201 | (when (and gnus-nocem-alist | |
202 | gnus-nocem-touched-alist) | |
203 | (nnheader-temp-write (gnus-nocem-cache-file) | |
204 | (prin1 `(setq gnus-nocem-alist ',gnus-nocem-alist) (current-buffer))) | |
205 | (setq gnus-nocem-touched-alist nil))) | |
206 | ||
207 | (defun gnus-nocem-save-active () | |
208 | "Save the NoCeM active file." | |
209 | (nnheader-temp-write (gnus-nocem-active-file) | |
210 | (prin1 `(setq gnus-nocem-active ',gnus-nocem-active) (current-buffer)))) | |
211 | ||
212 | (defun gnus-nocem-alist-to-hashtb () | |
213 | "Create a hashtable from the Message-IDs we have." | |
214 | (let* ((alist gnus-nocem-alist) | |
215 | (pprev (cons nil alist)) | |
216 | (prev pprev) | |
217 | (expiry (nnmail-days-to-time gnus-nocem-expiry-wait)) | |
218 | entry) | |
219 | (setq gnus-nocem-hashtb (gnus-make-hashtable (* (length alist) 51))) | |
220 | (while (setq entry (car alist)) | |
221 | (if (not (nnmail-time-less (nnmail-time-since (car entry)) expiry)) | |
222 | ;; This entry has expired, so we remove it. | |
223 | (setcdr prev (cdr alist)) | |
224 | (setq prev alist) | |
225 | ;; This is ok, so we enter it into the hashtable. | |
226 | (setq entry (cdr entry)) | |
227 | (while entry | |
228 | (gnus-sethash (car entry) t gnus-nocem-hashtb) | |
229 | (setq entry (cdr entry)))) | |
230 | (setq alist (cdr alist))))) | |
231 | ||
232 | (gnus-add-shutdown 'gnus-nocem-close 'gnus) | |
233 | ||
234 | (defun gnus-nocem-close () | |
235 | "Clear internal NoCeM variables." | |
236 | (setq gnus-nocem-alist nil | |
237 | gnus-nocem-hashtb nil | |
238 | gnus-nocem-active nil | |
239 | gnus-nocem-touched-alist nil)) | |
240 | ||
241 | (defun gnus-nocem-unwanted-article-p (id) | |
242 | "Say whether article ID in the current group is wanted." | |
243 | (gnus-gethash id gnus-nocem-hashtb)) | |
244 | ||
245 | (provide 'gnus-nocem) | |
246 | ||
247 | ;;; gnus-nocem.el ends here |