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1 ;;; nndb.el --- nndb access for Gnus
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2 ;; Copyright (C) 1997 Free Software Foundation, Inc.
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3
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4 ;; Author: Masanobu UMEDA <umerin@flab.flab.fujitsu.junet>
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5 ;; Kai Grossjohann <grossjohann@ls6.informatik.uni-dortmund.de>
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6 ;; Joe Hildebrand <joe.hildebrand@ilg.com>
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7 ;; David Blacka <davidb@rwhois.net>
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8 ;; Keywords: news
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9
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10 ;; This file is NOT part of GNU Emacs.
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11
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12 ;; GNU Emacs is free software; you can redistribute it and/or modify
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13 ;; it under the terms of the GNU General Public License as published by
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14 ;; the Free Software Foundation; either version 2, or (at your option)
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15 ;; any later version.
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16
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17 ;; GNU Emacs is distributed in the hope that it will be useful,
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18 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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20 ;; GNU General Public License for more details.
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21
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22 ;; You should have received a copy of the GNU General Public License
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23 ;; along with GNU Emacs; see the file COPYING. If not, write to the
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24 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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25 ;; Boston, MA 02111-1307, USA.
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26
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27 ;;; Commentary:
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28
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29 ;;; This was based upon Kai Grossjohan's shamessly snarfed code and
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30 ;;; further modified by Joe Hildebrand. It has been updated for Red
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31 ;;; Gnus.
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32
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33 ;; TODO:
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34 ;;
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35 ;; * Fix bug where server connection can be lost and impossible to regain
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36 ;; This hasn't happened to me in a while; think it was fixed in Rgnus
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37 ;;
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38 ;; * make it handle different nndb servers seemlessly
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39 ;;
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40 ;; * Optimize expire if FORCE
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41 ;;
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42 ;; * Optimize move (only expire once)
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43 ;;
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44 ;; * Deal with add/deletion of groups
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45 ;;
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46 ;; * make the backend TOUCH an article when marked as expireable (will
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47 ;; make article expire 'expiry' days after that moment).
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48
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49 ;;-
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50 ;; Register nndb with known select methods.
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51
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52 (gnus-declare-backend "nndb" 'mail 'respool 'address 'prompt-address)
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53
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54 ;;; Code:
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55
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56 (require 'nnmail)
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57 (require 'nnheader)
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58 (require 'nntp)
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59 (eval-when-compile (require 'cl))
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60
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61 (eval-and-compile
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62 (unless (fboundp 'open-network-stream)
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63 (require 'tcp)))
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64
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65 (eval-when-compile (require 'cl))
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66
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67 (eval-and-compile
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68 (autoload 'news-setup "rnewspost")
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69 (autoload 'news-reply-mode "rnewspost")
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70 (autoload 'cancel-timer "timer")
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71 (autoload 'telnet "telnet" nil t)
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72 (autoload 'telnet-send-input "telnet" nil t)
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73 (autoload 'timezone-parse-date "timezone"))
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74
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75 ;; Declare nndb as derived from nntp
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76
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77 (nnoo-declare nndb nntp)
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78
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79 ;; Variables specific to nndb
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80
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81 ;;- currently not used but just in case...
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82 (defvoo nndb-deliver-program "nndel"
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83 "*The program used to put a message in an NNDB group.")
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84
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85 (defvoo nndb-server-side-expiry nil
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86 "If t, expiry calculation will occur on the server side")
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87
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88 (defvoo nndb-set-expire-date-on-mark nil
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89 "If t, the expiry date for a given article will be set to the time
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90 it was marked as expireable; otherwise the date will be the time the
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91 article was posted to nndb")
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92
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93 ;; Variables copied from nntp
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94
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95 (defvoo nndb-server-opened-hook '(nntp-send-authinfo-from-file)
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96 "Like nntp-server-opened-hook."
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97 nntp-server-opened-hook)
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98
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99 (defvoo nndb-address "localhost"
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100 "*The name of the NNDB server."
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101 nntp-address)
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102
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103 (defvoo nndb-port-number 9000
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104 "*Port number to connect to."
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105 nntp-port-number)
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106
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107 ;; change to 'news if you are actually using nndb for news
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108 (defvoo nndb-article-type 'mail)
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109
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110 (defvoo nndb-status-string nil "" nntp-status-string)
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111
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112
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113
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114 (defconst nndb-version "nndb 0.7"
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115 "Version numbers of this version of NNDB.")
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116
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117
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118 ;;; Interface functions.
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119
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120 (nnoo-define-basics nndb)
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121
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122 ;;------------------------------------------------------------------
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123
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124 ;; this function turns the lisp list into a string list. There is
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125 ;; probably a more efficient way to do this.
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126 (defun nndb-build-article-string (articles)
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127 (let (art-string art)
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128 (while articles
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129 (setq art (pop articles))
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130 (setq art-string (concat art-string art " ")))
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131 art-string))
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132
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133 (defun nndb-build-expire-rest-list (total expire)
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134 (let (art rest)
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135 (while total
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136 (setq art (pop total))
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137 (if (memq art expire)
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138 ()
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139 (push art rest)))
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140 rest))
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141
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142
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143 ;;
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144 (deffoo nndb-request-type (group &optional article)
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145 nndb-article-type)
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146
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147 ;; nndb-request-update-info does not exist and is not needed
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148
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149 ;; nndb-request-update-mark does not exist; it should be used to TOUCH
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150 ;; articles as they are marked exipirable
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151 (defun nndb-touch-article (group article)
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152 (nntp-send-command nil "X-TOUCH" article))
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153
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154 (deffoo nndb-request-update-mark
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155 (group article mark)
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156 "Sets the expiry date for ARTICLE in GROUP to now, if the mark is 'E'"
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157 (if (and nndb-set-expire-date-on-mark (string-equal mark "E"))
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158 (nndb-touch-article group article))
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159 mark)
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160
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161 ;; nndb-request-create-group -- currently this isn't necessary; nndb
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162 ;; creates groups on demand.
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163
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164 ;; todo -- use some other time than the creation time of the article
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165 ;; best is time since article has been marked as expirable
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166
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167 (defun nndb-request-expire-articles-local
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168 (articles &optional group server force)
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169 "Let gnus do the date check and issue the delete commands."
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170 (let (msg art delete-list (num-delete 0) rest)
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171 (nntp-possibly-change-group group server)
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172 (while articles
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173 (setq art (pop articles))
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174 (nntp-send-command "^\\([23]\\|^423\\).*\n" "X-DATE" art)
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175 (setq msg (nndb-status-message))
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176 (if (string-match "^423" msg)
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177 ()
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178 (or (string-match "'\\(.+\\)'" msg)
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179 (error "Not a valid response for X-DATE command: %s"
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180 msg))
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181 (if (nnmail-expired-article-p
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182 group
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183 (gnus-encode-date
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184 (substring msg (match-beginning 1) (match-end 1)))
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185 force)
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186 (progn
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187 (setq delete-list (concat delete-list " " (int-to-string art)))
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188 (setq num-delete (1+ num-delete)))
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189 (push art rest))))
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190 (if (> (length delete-list) 0)
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191 (progn
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192 (nnheader-message 5 "Deleting %s article(s) from %s"
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193 (int-to-string num-delete) group)
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194 (nntp-send-command "^[23].*\n" "X-DELETE" delete-list))
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195 )
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196
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197 (message "")
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198 (nconc rest articles)))
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199
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200 (defun nndb-get-remote-expire-response ()
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201 (let (list)
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202 (set-buffer nntp-server-buffer)
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203 (goto-char (point-min))
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204 (if (looking-at "^[34]")
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205 ;; x-expire returned error--presume no articles were expirable)
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206 (setq list nil)
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207 ;; otherwise, pull all of the following numbers into the list
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208 (re-search-forward "follows\r?\n?" nil t)
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209 (while (re-search-forward "^[0-9]+$" nil t)
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210 (push (string-to-int (match-string 0)) list)))
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211 list))
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212
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213 (defun nndb-request-expire-articles-remote
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214 (articles &optional group server force)
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215 "Let the nndb backend expire articles"
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216 (let (days art-string delete-list (num-delete 0))
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217 (nntp-possibly-change-group group server)
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218
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219 ;; first calculate the wait period in days
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220 (setq days (or (and nnmail-expiry-wait-function
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221 (funcall nnmail-expiry-wait-function group))
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222 nnmail-expiry-wait))
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223 ;; now handle the special cases
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224 (cond (force
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225 (setq days 0))
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226 ((eq days 'never)
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227 ;; This isn't an expirable group.
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228 (setq days -1))
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229 ((eq days 'immediate)
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230 (setq days 0)))
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231
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232
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233 ;; build article string
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234 (setq art-string (concat days " " (nndb-build-article-string articles)))
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235 (nntp-send-command "^\.\r?\n\\|^[345].*\n" "X-EXPIRE" art-string)
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236
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237 (setq delete-list (nndb-get-remote-expire-response))
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238 (setq num-delete (length delete-list))
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239 (if (> num-delete 0)
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240 (nnheader-message 5 "Deleting %s article(s) from %s"
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241 (int-to-string num-delete) group))
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242
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243 (nndb-build-expire-rest-list articles delete-list)))
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244
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245 (deffoo nndb-request-expire-articles
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246 (articles &optional group server force)
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247 "Expires ARTICLES from GROUP on SERVER.
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248 If FORCE, delete regardless of exiration date, otherwise use normal
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249 expiry mechanism."
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250 (if nndb-server-side-expiry
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251 (nndb-request-expire-articles-remote articles group server force)
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252 (nndb-request-expire-articles-local articles group server force)))
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253
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254 (deffoo nndb-request-move-article
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255 (article group server accept-form &optional last)
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256 "Move ARTICLE (a number) from GROUP on SERVER.
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257 Evals ACCEPT-FORM in current buffer, where the article is.
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258 Optional LAST is ignored."
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259 ;; we guess that the second arg in accept-form is the new group,
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260 ;; which it will be for nndb, which is all that matters anyway
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261 (let ((new-group (nth 1 accept-form)) result)
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262 (nntp-possibly-change-group group server)
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263
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264 ;; use the move command for nndb-to-nndb moves
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265 (if (string-match "^nndb" new-group)
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266 (let ((new-group-name (gnus-group-real-name new-group)))
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267 (nntp-send-command "^[23].*\n" "X-MOVE" article new-group-name)
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268 (cons new-group article))
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269 ;; else move normally
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270 (let ((artbuf (get-buffer-create " *nndb move*")))
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271 (and
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272 (nndb-request-article article group server artbuf)
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273 (save-excursion
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274 (set-buffer artbuf)
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275 (insert-buffer-substring nntp-server-buffer)
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276 (setq result (eval accept-form))
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277 (kill-buffer (current-buffer))
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278 result)
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279 (nndb-request-expire-articles (list article)
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280 group
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281 server
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282 t))
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283 result)
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284 )))
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285
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286 (deffoo nndb-request-accept-article (group server &optional last)
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287 "The article in the current buffer is put into GROUP."
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288 (nntp-possibly-change-group group server)
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289 (let (art msg)
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290 (when (nntp-send-command "^[23].*\r?\n" "ACCEPT" group)
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291 (nnheader-insert "")
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292 (nntp-send-buffer "^[23].*\n"))
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293
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294 (set-buffer nntp-server-buffer)
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295 (setq msg (buffer-string (point-min) (point-max)))
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296 (or (string-match "^\\([0-9]+\\)" msg)
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297 (error "nndb: %s" msg))
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298 (setq art (substring msg (match-beginning 1) (match-end 1)))
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299 (message "nndb: accepted %s" art)
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300 (list art)))
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301
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302 (deffoo nndb-request-replace-article (article group buffer)
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303 "ARTICLE is the number of the article in GROUP to be replaced
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304 with the contents of the BUFFER."
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305 (set-buffer buffer)
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306 (when (nntp-send-command "^[23].*\r?\n" "X-REPLACE" (int-to-string article))
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307 (nnheader-insert "")
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308 (nntp-send-buffer "^[23.*\n")
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309 (list (int-to-string article))))
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310
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311 ; nndb-request-delete-group does not exist
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312 ; todo -- maybe later
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313
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314 ; nndb-request-rename-group does not exist
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315 ; todo -- maybe later
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316
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317 ;; -- standard compatability functions
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318
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319 (deffoo nndb-status-message (&optional server)
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320 "Return server status as a string."
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321 (set-buffer nntp-server-buffer)
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322 (buffer-string (point-min) (point-max)))
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323
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324 ;; Import stuff from nntp
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325
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326 (nnoo-import nndb
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327 (nntp))
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328
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329 (provide 'nndb)
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330
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331
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332
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