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1 ;;; url-news.el --- News Uniform Resource Locator retrieval code
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2 ;; Author: wmperry
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3 ;; Created: 1997/02/18 23:35:11
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4 ;; Version: 1.7
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5 ;; Keywords: comm, data, processes
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6
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7 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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8 ;;; Copyright (c) 1993-1996 by William M. Perry (wmperry@cs.indiana.edu)
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9 ;;; Copyright (c) 1996, 1997 Free Software Foundation, Inc.
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10 ;;;
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11 ;;; This file is not part of GNU Emacs, but the same permissions apply.
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12 ;;;
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13 ;;; GNU Emacs is free software; you can redistribute it and/or modify
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14 ;;; it under the terms of the GNU General Public License as published by
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15 ;;; the Free Software Foundation; either version 2, or (at your option)
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16 ;;; any later version.
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17 ;;;
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18 ;;; GNU Emacs is distributed in the hope that it will be useful,
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19 ;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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20 ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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21 ;;; GNU General Public License for more details.
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22 ;;;
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23 ;;; You should have received a copy of the GNU General Public License
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24 ;;; along with GNU Emacs; see the file COPYING. If not, write to the
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25 ;;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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26 ;;; Boston, MA 02111-1307, USA.
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27 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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28 (require 'url-vars)
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29 (require 'url-parse)
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30
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31 (defun url-format-news ()
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32 (url-clear-tmp-buffer)
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33 (insert "HTTP/1.0 200 Retrieval OK\r\n"
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34 (save-excursion
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35 (set-buffer nntp-server-buffer)
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36 (buffer-string)))
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37 (url-parse-mime-headers)
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38 (let* ((from (cdr (assoc "from" url-current-mime-headers)))
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39 (qfrom (if from (url-insert-entities-in-string from) nil))
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40 (subj (cdr (assoc "subject" url-current-mime-headers)))
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41 (qsubj (if subj (url-insert-entities-in-string subj) nil))
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42 (org (cdr (assoc "organization" url-current-mime-headers)))
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43 (qorg (if org (url-insert-entities-in-string org) nil))
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44 (typ (or (cdr (assoc "content-type" url-current-mime-headers))
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45 "text/plain"))
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46 (qgrps (mapcar 'car
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47 (url-split
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48 (url-insert-entities-in-string
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49 (or (cdr (assoc "newsgroups"
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50 url-current-mime-headers))
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51 ""))
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52 "[ \t\n,]+")))
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53 (qrefs (delete ""
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54 (mapcar
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55 'url-insert-entities-in-string
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56 (mapcar 'car
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57 (url-split
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58 (or (cdr (assoc "references"
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59 url-current-mime-headers))
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60 "")
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61 "[ \t,\n<>]+")))))
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62 (date (cdr (assoc "date" url-current-mime-headers))))
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63 (if (or (not (string-match "text/" typ))
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64 (string-match "text/html" typ))
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65 nil ; Let natural content-type take over
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66 (insert "<html>\n"
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67 " <head>\n"
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68 " <title>" qsubj "</title>\n"
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69 " <link rev=\"made\" href=\"mailto:" qfrom "\">\n"
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70 " </head>\n"
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71 " <body>\n"
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72 " <div>\n"
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73 " <h1 align=center>" qsubj "</h1>\n"
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74 " <p role=\"headers\">\n"
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75 " <b>From</b>: " qfrom "<br>\n"
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76 " <b>Newsgroups</b>: "
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77 (mapconcat
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78 (function
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79 (lambda (grp)
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80 (concat "<a href=\"" grp "\">" grp "</a>"))) qgrps ", ")
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81 "<br>\n"
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82 (if org
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83 (concat
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84 " <b>Organization</b>: <i> " qorg "</i> <br>\n")
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85 "")
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86 " <b>Date</b>: <date> " date "</date> <br>\n"
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87 " </p> <hr>\n"
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88 (if (null qrefs)
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89 ""
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90 (concat
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91 " <p>References\n"
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92 " <ol>\n"
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93 (mapconcat
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94 (function
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95 (lambda (ref)
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96 (concat " <li> <a href=\"" ref "\"> "
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97 ref "</a></li>\n")))
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98 qrefs "")
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99 " </ol>\n"
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100 " </p>\n"
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101 " <hr>\n"))
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102 " <ul plain>\n"
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103 " <li><a href=\"newspost:disfunctional\"> "
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104 "Post to this group </a></li>\n"
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105 " <li><a href=\"mailto:" qfrom "\"> Reply to " qfrom
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106 "</a></li>\n"
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107 " </ul>\n"
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108 " <hr>"
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109 " <pre>\n")
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110 (let ((s (buffer-substring (point) (point-max))))
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111 (delete-region (point) (point-max))
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112 (insert (url-insert-entities-in-string s)))
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113 (goto-char (point-max))
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114 (setq url-current-mime-type "text/html"
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115 url-current-mime-viewer (mm-mime-info url-current-mime-type nil 5))
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116 (let ((x (assoc "content-type" url-current-mime-headers)))
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117 (if x
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118 (setcdr x "text/html")
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119 (setq url-current-mime-headers (cons (cons "content-type"
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120 "text/html")
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121 url-current-mime-headers))))
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122 (insert "\n"
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123 " </pre>\n"
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124 " </div>\n"
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125 " </body>\n"
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126 "</html>\n"
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127 "<!-- Automatically generated by URL/" url-version
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128 "-->"))))
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129
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130 (defun url-check-gnus-version ()
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131 (require 'nntp)
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132 (condition-case ()
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133 (require 'gnus)
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134 (error (setq gnus-version "GNUS not found")))
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135 (if (or (not (boundp 'gnus-version))
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136 (string-match "v5.[.0-9]+$" gnus-version)
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137 (string-match "Red" gnus-version))
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138 nil
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139 (url-warn 'url (concat
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140 "The version of GNUS found on this system is too old and does\n"
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141 "not support the necessary functionality for the URL package.\n"
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142 "Please upgrade to version 5.x of GNUS. This is bundled by\n"
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143 "default with Emacs 19.30 and XEmacs 19.14 and later.\n\n"
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144 "This version of GNUS is: " gnus-version "\n"))
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145 (fset 'url-news 'url-news-version-too-old))
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146 (fset 'url-check-gnus-version 'ignore))
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147
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148 (defun url-news-version-too-old (article)
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149 (set-buffer (get-buffer-create url-working-buffer))
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150 (setq url-current-mime-headers '(("content-type" . "text/html"))
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151 url-current-mime-type "text/html")
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152 (insert "<html>\n"
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153 " <head>\n"
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154 " <title>News Error</title>\n"
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155 " </head>\n"
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156 " <body>\n"
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157 " <h1>News Error - too old</h1>\n"
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158 " <p>\n"
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159 " The version of GNUS found on this system is too old and does\n"
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160 " not support the necessary functionality for the URL package.\n"
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161 " Please upgrade to version 5.x of GNUS. This is bundled by\n"
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162 " default with Emacs 19.30 and XEmacs 19.14 and later.\n\n"
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163 " This version of GNUS is: " gnus-version "\n"
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164 " </p>\n"
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165 " </body>\n"
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166 "</html>\n"))
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167
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168 (defun url-news-open-host (host port user pass)
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169 (if (fboundp 'nnheader-init-server-buffer)
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170 (nnheader-init-server-buffer))
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171 (nntp-open-server host (list (string-to-int port)))
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172 (if (and user pass)
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173 (progn
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174 (nntp-send-command "^.*\r?\n" "AUTHINFO USER" user)
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175 (nntp-send-command "^.*\r?\n" "AUTHINFO PASS" pass)
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176 (if (not (nntp-server-opened host))
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177 (url-warn 'url (format "NNTP authentication to `%s' as `%s' failed"
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178 host user))))))
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179
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180 (defun url-news-fetch-article-number (newsgroup article)
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181 (nntp-request-group newsgroup)
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182 (nntp-request-article article))
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183
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184 (defun url-news-fetch-message-id (host port message-id)
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185 (if (eq ?> (aref message-id (1- (length message-id))))
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186 nil
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187 (setq message-id (concat "<" message-id ">")))
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188 (if (nntp-request-article message-id)
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189 (url-format-news)
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190 (set-buffer (get-buffer-create url-working-buffer))
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191 (setq url-current-can-be-cached nil)
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192 (insert "<html>\n"
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193 " <head>\n"
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194 " <title>Error</title>\n"
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195 " </head>\n"
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196 " <body>\n"
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197 " <div>\n"
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198 " <h1>Error requesting article...</h1>\n"
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199 " <p>\n"
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200 " The status message returned by the NNTP server was:"
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201 "<br><hr>\n"
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202 " <xmp>\n"
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203 (nntp-status-message)
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204 " </xmp>\n"
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205 " </p>\n"
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206 " <p>\n"
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207 " If you If you feel this is an error, <a href=\""
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208 "mailto:" url-bug-address "\">send me mail</a>\n"
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209 " </p>\n"
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210 " </div>\n"
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211 " </body>\n"
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212 "</html>\n"
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213 "<!-- Automatically generated by URL v" url-version " -->\n"
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214 )))
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215
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216 (defun url-news-fetch-newsgroup (newsgroup host)
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217 (if (string-match "^/+" newsgroup)
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218 (setq newsgroup (substring newsgroup (match-end 0))))
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219 (if (string-match "/+$" newsgroup)
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220 (setq newsgroup (substring newsgroup 0 (match-beginning 0))))
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221
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222 ;; This saves a bogus 'Untitled' buffer by Emacs-W3
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223 (kill-buffer url-working-buffer)
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224
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225 ;; This saves us from checking new news if GNUS is already running
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226 (if (or (not (get-buffer gnus-group-buffer))
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227 (save-excursion
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228 (set-buffer gnus-group-buffer)
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229 (not (eq major-mode 'gnus-group-mode))))
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230 (gnus))
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231 (set-buffer gnus-group-buffer)
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232 (goto-char (point-min))
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233 (gnus-group-read-ephemeral-group newsgroup (list 'nntp host)
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234 nil
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235 (cons (current-buffer) 'browse)))
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236
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237 (defun url-news (article)
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238 ;; Find a news reference
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239 (url-check-gnus-version)
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240 (let* ((urlobj (url-generic-parse-url article))
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241 (host (or (url-host urlobj) url-news-server))
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242 (port (or (url-port urlobj)
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243 (cdr-safe (assoc "news" url-default-ports))))
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244 (article-brackets nil)
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245 (article (url-filename urlobj)))
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246 (url-news-open-host host port (url-user urlobj) (url-password urlobj))
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247 (cond
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248 ((string-match "@" article) ; Its a specific article
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249 (url-news-fetch-message-id host port article))
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250 ((string= article "") ; List all newsgroups
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251 (gnus)
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252 (kill-buffer url-working-buffer))
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253 (t ; Whole newsgroup
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254 (url-news-fetch-newsgroup article host)))))
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255
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256 (defun url-nntp (url)
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257 ;; Find a news reference
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258 (url-check-gnus-version)
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259 (let* ((urlobj (url-generic-parse-url url))
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260 (host (or (url-host urlobj) url-news-server))
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261 (port (or (url-port urlobj)
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262 (cdr-safe (assoc "nntp" url-default-ports))))
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263 (article-brackets nil)
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264 (article (url-filename urlobj)))
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265 (url-news-open-host host port (url-user urlobj) (url-password urlobj))
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266 (cond
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267 ((string-match "@" article) ; Its a specific article
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268 (url-news-fetch-message-id host port article))
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269 ((string-match "/\\([0-9]+\\)$" article)
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270 (url-news-fetch-article-number (substring article 0
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271 (match-beginning 0))
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272 (match-string 1 article)))
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273
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274 ((string= article "") ; List all newsgroups
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275 (gnus)
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276 (kill-buffer url-working-buffer))
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277 (t ; Whole newsgroup
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278 (url-news-fetch-newsgroup article)))))
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279
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280 (provide 'url-news)
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