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