lisp/url/url-news.el

   1 ;;; url-news.el --- News Uniform Resource Locator retrieval code
   2
   3 ;; Copyright (C) 1996, 1997, 1998, 1999, 2004,
   4 ;;   2005 Free Software Foundation, Inc.
   5
   6 ;; Keywords: comm, data, processes
   7
   8 ;; This file is part of GNU Emacs.
   9
  10 ;; GNU Emacs is free software; you can redistribute it and/or modify
  11 ;; it under the terms of the GNU General Public License as published by
  12 ;; the Free Software Foundation; either version 2, or (at your option)
  13 ;; any later version.
  14
  15 ;; GNU Emacs is distributed in the hope that it will be useful,
  16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 ;; GNU General Public License for more details.
  19
  20 ;; You should have received a copy of the GNU General Public License
  21 ;; along with GNU Emacs; see the file COPYING.  If not, write to the
  22 ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  23 ;; Boston, MA 02110-1301, USA.
  24
  25 ;;; Code:
  26
  27 (require 'url-vars)
  28 (require 'url-util)
  29 (require 'url-parse)
  30 (require 'nntp)
  31 (autoload 'url-warn "url")
  32 (autoload 'gnus-group-read-ephemeral-group "gnus-group")
  33 (eval-when-compile
  34   (require 'cl)
  35   (defvar nntp-open-tls-stream)
  36   (defvar nntp-open-ssl-stream))
  37
  38 (defgroup url-news nil
  39   "News related options."
  40   :group 'url)
  41
  42 (defun url-news-open-host (host port user pass)
  43   (if (fboundp 'nnheader-init-server-buffer)
  44       (nnheader-init-server-buffer))
  45   (nntp-open-server host (list port))
  46   (if (and user pass)
  47       (progn
  48         (nntp-send-command "^.*\r?\n" "AUTHINFO USER" user)
  49         (nntp-send-command "^.*\r?\n" "AUTHINFO PASS" pass)
  50         (if (not (nntp-server-opened host))
  51             (url-warn 'url (format "NNTP authentication to `%s' as `%s' failed"
  52                                    host user))))))
  53
  54 (defun url-news-fetch-message-id (host message-id)
  55   (let ((buf (generate-new-buffer " *url-news*")))
  56     (if (eq ?> (aref message-id (1- (length message-id))))
  57         nil
  58       (setq message-id (concat "<" message-id ">")))
  59     (if (cdr-safe (nntp-request-article message-id nil host buf))
  60         ;; Successfully retrieved the article
  61         nil
  62       (save-excursion
  63         (set-buffer buf)
  64         (insert "Content-type: text/html\n\n"
  65                 "<html>\n"
  66                 " <head>\n"
  67                 "  <title>Error</title>\n"
  68                 " </head>\n"
  69                 " <body>\n"
  70                 "  <div>\n"
  71                 "   <h1>Error requesting article...</h1>\n"
  72                 "   <p>\n"
  73                 "    The status message returned by the NNTP server was:"
  74                 "<br><hr>\n"
  75                 "    <xmp>\n"
  76                 (nntp-status-message)
  77                 "    </xmp>\n"
  78                 "   </p>\n"
  79                 "   <p>\n"
  80                 "    If you If you feel this is an error, <a href=\""
  81                 "mailto:" url-bug-address "\">send mail</a>\n"
  82                 "   </p>\n"
  83                 "  </div>\n"
  84                 " </body>\n"
  85                 "</html>\n"
  86                 "<!-- Automatically generated by URL v" url-version " -->\n"
  87                 )))
  88     buf))
  89
  90 (defun url-news-fetch-newsgroup (newsgroup host)
  91   (declare (special gnus-group-buffer))
  92   (if (string-match "^/+" newsgroup)
  93       (setq newsgroup (substring newsgroup (match-end 0))))
  94   (if (string-match "/+$" newsgroup)
  95       (setq newsgroup (substring newsgroup 0 (match-beginning 0))))
  96
  97   ;; This saves us from checking new news if Gnus is already running
  98   ;; FIXME - is it relatively safe to use gnus-alive-p here? FIXME
  99   (if (or (not (get-buffer gnus-group-buffer))
 100           (save-excursion
 101             (set-buffer gnus-group-buffer)
 102             (not (eq major-mode 'gnus-group-mode))))
 103       (gnus))
 104   (set-buffer gnus-group-buffer)
 105   (goto-char (point-min))
 106   (gnus-group-read-ephemeral-group newsgroup
 107                                    (list 'nntp host
 108                                          'nntp-open-connection-function
 109                                          nntp-open-connection-function)
 110                                    nil
 111                                    (cons (current-buffer) 'browse)))
 112
 113 ;;;###autoload
 114 (defun url-news (url)
 115   ;; Find a news reference
 116   (let* ((host (or (url-host url) url-news-server))
 117          (port (url-port url))
 118          (article-brackets nil)
 119          (buf nil)
 120          (article (url-filename url)))
 121     (url-news-open-host host port (url-user url) (url-password url))
 122     (setq article (url-unhex-string article))
 123     (cond
 124      ((string-match "@" article)        ; Its a specific article
 125       (setq buf (url-news-fetch-message-id host article)))
 126      ((string= article "")              ; List all newsgroups
 127       (gnus))
 128      (t                                 ; Whole newsgroup
 129       (url-news-fetch-newsgroup article host)))
 130     buf))
 131
 132 ;;;###autoload
 133 (defun url-snews (url)
 134   (let ((nntp-open-connection-function (if (eq 'tls url-gateway-method)
 135                                            nntp-open-tls-stream
 136                                          nntp-open-ssl-stream)))
 137     (url-news url)))
 138
 139 (provide 'url-news)
 140
 141 ;;; arch-tag: 8975be13-04e8-4d38-bfff-47918e3ad311
 142 ;;; url-news.el ends here