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1 ;;; gnus-nocem.el --- NoCeM pseudo-cancellation treatment
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2 ;; Copyright (C) 1995,96,97 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 (require 'gnus-art)
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31 (require 'gnus-sum)
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32 (require 'gnus-range)
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33
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34 (defgroup gnus-nocem nil
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35 "NoCeM pseudo-cancellation treatment"
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36 :group 'gnus-score)
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37
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30
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38 (defcustom gnus-nocem-groups
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39 '("news.lists.filters" "news.admin.net-abuse.bulletins"
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40 "alt.nocem.misc" "news.admin.net-abuse.announce")
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41 "List of groups that will be searched for NoCeM messages."
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42 :group 'gnus-nocem
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43 :type '(repeat (string :tag "Group")))
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44
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45 (defcustom gnus-nocem-issuers
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46 '("AutoMoose-1" "Automoose-1" ; CancelMoose[tm]
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47 "rbraver@ohww.norman.ok.us" ; Robert Braver
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48 "clewis@ferret.ocunix.on.ca;" ; Chris Lewis
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49 "jem@xpat.com;" ; Despammer from Korea
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50 "snowhare@xmission.com" ; Benjamin "Snowhare" Franz
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51 "red@redpoll.mrfs.oh.us (Richard E. Depew)" ; ARMM! ARMM!
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52 )
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53 "List of NoCeM issuers to pay attention to."
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54 :group 'gnus-nocem
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55 :type '(repeat string))
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56
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57 (defcustom gnus-nocem-directory
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58 (nnheader-concat gnus-article-save-directory "NoCeM/")
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59 "*Directory where NoCeM files will be stored."
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60 :group 'gnus-nocem
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61 :type 'directory)
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62
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63 (defcustom gnus-nocem-expiry-wait 15
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64 "*Number of days to keep NoCeM headers in the cache."
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65 :group 'gnus-nocem
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66 :type 'integer)
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67
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68 (defcustom gnus-nocem-verifyer 'mc-verify
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69 "*Function called to verify that the NoCeM message is valid.
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70 One likely value is `mc-verify'. If the function in this variable
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71 isn't bound, the message will be used unconditionally."
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72 :group 'gnus-nocem
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73 :type '(radio (function-item mc-verify)
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74 (function :tag "other")))
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75
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76 (defcustom gnus-nocem-liberal-fetch nil
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77 "*If t try to fetch all messages which have @@NCM in the subject.
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78 Otherwise don't fetch messages which have references or whose message-id
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79 matches an previously scanned and verified nocem message."
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80 :group 'gnus-nocem
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81 :type 'boolean)
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82
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83 ;;; Internal variables
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84
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85 (defvar gnus-nocem-active nil)
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86 (defvar gnus-nocem-alist nil)
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87 (defvar gnus-nocem-touched-alist nil)
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88 (defvar gnus-nocem-hashtb nil)
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89 (defvar gnus-nocem-seen-message-ids nil)
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90
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91 ;;; Functions
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92
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93 (defun gnus-nocem-active-file ()
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94 (concat (file-name-as-directory gnus-nocem-directory) "active"))
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95
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96 (defun gnus-nocem-cache-file ()
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97 (concat (file-name-as-directory gnus-nocem-directory) "cache"))
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98
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99 (defun gnus-nocem-scan-groups ()
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100 "Scan all NoCeM groups for new NoCeM messages."
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101 (interactive)
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102 (let ((groups gnus-nocem-groups)
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103 (gnus-inhibit-demon t)
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104 group active gactive articles)
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105 (gnus-make-directory gnus-nocem-directory)
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106 ;; Load any previous NoCeM headers.
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107 (gnus-nocem-load-cache)
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108 ;; Read the active file if it hasn't been read yet.
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109 (and (file-exists-p (gnus-nocem-active-file))
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110 (not gnus-nocem-active)
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111 (ignore-errors
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112 (load (gnus-nocem-active-file) t t t)))
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113 ;; Go through all groups and see whether new articles have
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114 ;; arrived.
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115 (while (setq group (pop groups))
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116 (if (not (setq gactive (gnus-activate-group group)))
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117 () ; This group doesn't exist.
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118 (setq active (nth 1 (assoc group gnus-nocem-active)))
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119 (when (and (not (< (cdr gactive) (car gactive))) ; Empty group.
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120 (or (not active)
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121 (< (cdr active) (cdr gactive))))
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122 ;; Ok, there are new articles in this group, se we fetch the
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123 ;; headers.
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124 (save-excursion
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125 (let ((dependencies (make-vector 10 nil))
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126 headers header)
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127 (nnheader-temp-write nil
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128 (setq headers
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129 (if (eq 'nov
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130 (gnus-retrieve-headers
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131 (setq articles
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132 (gnus-uncompress-range
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133 (cons
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134 (if active (1+ (cdr active))
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135 (car gactive))
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136 (cdr gactive))))
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137 group))
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138 (gnus-get-newsgroup-headers-xover
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139 articles nil dependencies)
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140 (gnus-get-newsgroup-headers dependencies)))
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141 (while (setq header (pop headers))
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142 ;; We take a closer look on all articles that have
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143 ;; "@@NCM" in the subject. Unless we already read
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144 ;; this cross posted message. Nocem messages
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145 ;; are not allowed to have references, so we can
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146 ;; ignore scanning followups.
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147 (and (string-match "@@NCM" (mail-header-subject header))
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148 (or gnus-nocem-liberal-fetch
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149 (and (or (string= "" (mail-header-references
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150 header))
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151 (null (mail-header-references header)))
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152 (not (member (mail-header-message-id header)
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153 gnus-nocem-seen-message-ids))))
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154 (gnus-nocem-check-article group header)))))))
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155 (setq gnus-nocem-active
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156 (cons (list group gactive)
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157 (delq (assoc group gnus-nocem-active)
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158 gnus-nocem-active)))))
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159 ;; Save the results, if any.
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160 (gnus-nocem-save-cache)
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161 (gnus-nocem-save-active)))
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162
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163 (defun gnus-nocem-check-article (group header)
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164 "Check whether the current article is an NCM article and that we want it."
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165 ;; Get the article.
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166 (gnus-message 7 "Checking article %d in %s for NoCeM..."
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167 (mail-header-number header) group)
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168 (let ((date (mail-header-date header))
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169 issuer b e)
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170 (when (or (not date)
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171 (nnmail-time-less
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172 (nnmail-time-since (nnmail-date-to-time date))
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173 (nnmail-days-to-time gnus-nocem-expiry-wait)))
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174 (gnus-request-article-this-buffer (mail-header-number header) group)
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175 (goto-char (point-min))
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176 (when (re-search-forward "-----BEGIN PGP MESSAGE-----" nil t)
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177 (delete-region (point-min) (match-beginning 0)))
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178 (when (re-search-forward "-----END PGP MESSAGE-----\n?" nil t)
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179 (delete-region (match-end 0) (point-max)))
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180 (goto-char (point-min))
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181 ;; The article has to have proper NoCeM headers.
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182 (when (and (setq b (search-forward "\n@@BEGIN NCM HEADERS\n" nil t))
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183 (setq e (search-forward "\n@@BEGIN NCM BODY\n" nil t)))
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184 ;; We get the name of the issuer.
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185 (narrow-to-region b e)
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186 (setq issuer (mail-fetch-field "issuer"))
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187 (widen)
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188 (and (member issuer gnus-nocem-issuers) ; We like her....
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189 (gnus-nocem-verify-issuer issuer) ; She is who she says she is...
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190 (gnus-nocem-enter-article) ; We gobble the message..
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191 (push (mail-header-message-id header) ; But don't come back for
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192 gnus-nocem-seen-message-ids)))))) ; second helpings.
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193
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194 (defun gnus-nocem-verify-issuer (person)
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195 "Verify using PGP that the canceler is who she says she is."
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196 (if (fboundp gnus-nocem-verifyer)
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197 (funcall gnus-nocem-verifyer)
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198 ;; If we don't have Mailcrypt, then we use the message anyway.
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199 t))
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200
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201 (defun gnus-nocem-enter-article ()
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202 "Enter the current article into the NoCeM cache."
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203 (goto-char (point-min))
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204 (let ((b (search-forward "\n@@BEGIN NCM BODY\n" nil t))
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205 (e (search-forward "\n@@END NCM BODY\n" nil t))
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206 (buf (current-buffer))
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207 ncm id group)
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208 (when (and b e)
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209 (narrow-to-region b (1+ (match-beginning 0)))
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210 (goto-char (point-min))
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211 (while (search-forward "\t" nil t)
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212 (cond
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213 ((not (ignore-errors
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214 (setq group (let ((obarray gnus-active-hashtb)) (read buf)))))
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215 ;; An error.
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216 )
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217 ((not (symbolp group))
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218 ;; Ignore invalid entries.
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219 )
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220 ((not (boundp group))
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221 ;; Make sure all entries in the hashtb are bound.
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222 (set group nil))
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223 (t
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224 (when (gnus-gethash (symbol-name group) gnus-newsrc-hashtb)
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225 ;; Valid group.
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226 (beginning-of-line)
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227 (while (= (following-char) ?\t)
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228 (forward-line -1))
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229 (setq id (buffer-substring (point) (1- (search-forward "\t"))))
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230 (unless (gnus-gethash id gnus-nocem-hashtb)
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231 ;; only store if not already present
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232 (gnus-sethash id t gnus-nocem-hashtb)
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233 (push id ncm))
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234 (forward-line 1)
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235 (while (= (following-char) ?\t)
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236 (forward-line 1))))))
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237 (when ncm
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238 (setq gnus-nocem-touched-alist t)
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239 (push (cons (let ((time (current-time))) (setcdr (cdr time) nil) time)
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240 ncm)
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241 gnus-nocem-alist))
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242 t)))
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243
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244 (defun gnus-nocem-load-cache ()
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245 "Load the NoCeM cache."
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246 (interactive)
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247 (unless gnus-nocem-alist
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248 ;; The buffer doesn't exist, so we create it and load the NoCeM
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249 ;; cache.
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250 (when (file-exists-p (gnus-nocem-cache-file))
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251 (load (gnus-nocem-cache-file) t t t)
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252 (gnus-nocem-alist-to-hashtb))))
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253
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254 (defun gnus-nocem-save-cache ()
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255 "Save the NoCeM cache."
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256 (when (and gnus-nocem-alist
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257 gnus-nocem-touched-alist)
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258 (nnheader-temp-write (gnus-nocem-cache-file)
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259 (gnus-prin1 `(setq gnus-nocem-alist ',gnus-nocem-alist)))
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260 (setq gnus-nocem-touched-alist nil)))
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261
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262 (defun gnus-nocem-save-active ()
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263 "Save the NoCeM active file."
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264 (nnheader-temp-write (gnus-nocem-active-file)
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265 (gnus-prin1 `(setq gnus-nocem-active ',gnus-nocem-active))))
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266
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267 (defun gnus-nocem-alist-to-hashtb ()
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268 "Create a hashtable from the Message-IDs we have."
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269 (let* ((alist gnus-nocem-alist)
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270 (pprev (cons nil alist))
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271 (prev pprev)
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272 (expiry (nnmail-days-to-time gnus-nocem-expiry-wait))
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273 entry)
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274 (setq gnus-nocem-hashtb (gnus-make-hashtable (* (length alist) 51)))
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275 (while (setq entry (car alist))
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276 (if (not (nnmail-time-less (nnmail-time-since (car entry)) expiry))
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277 ;; This entry has expired, so we remove it.
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278 (setcdr prev (cdr alist))
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279 (setq prev alist)
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280 ;; This is ok, so we enter it into the hashtable.
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281 (setq entry (cdr entry))
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282 (while entry
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283 (gnus-sethash (car entry) t gnus-nocem-hashtb)
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284 (setq entry (cdr entry))))
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285 (setq alist (cdr alist)))))
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286
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287 (gnus-add-shutdown 'gnus-nocem-close 'gnus)
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288
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289 (defun gnus-nocem-close ()
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290 "Clear internal NoCeM variables."
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291 (setq gnus-nocem-alist nil
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292 gnus-nocem-hashtb nil
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293 gnus-nocem-active nil
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294 gnus-nocem-touched-alist nil
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295 gnus-nocem-seen-message-ids nil))
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296
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297 (defun gnus-nocem-unwanted-article-p (id)
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298 "Say whether article ID in the current group is wanted."
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299 (gnus-gethash id gnus-nocem-hashtb))
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300
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301 (provide 'gnus-nocem)
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302
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303 ;;; gnus-nocem.el ends here
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