code.delx.au - gnu-emacs/blob - 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, 2006, 2007 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 3, 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 (require 'cl))
  34 (defvar nntp-open-tls-stream)
  35 (defvar nntp-open-ssl-stream)
  36
  37 (defgroup url-news nil
  38   "News related options."
  39   :group 'url)
  40
  41 (defun url-news-open-host (host port user pass)
  42   (if (fboundp 'nnheader-init-server-buffer)
  43       (nnheader-init-server-buffer))
  44   (nntp-open-server host (list port))
  45   (if (and user pass)
  46       (progn
  47         (nntp-send-command "^.*\r?\n" "AUTHINFO USER" user)
  48         (nntp-send-command "^.*\r?\n" "AUTHINFO PASS" pass)
  49         (if (not (nntp-server-opened host))
  50             (url-warn 'url (format "NNTP authentication to `%s' as `%s' failed"
  51                                    host user))))))
  52
  53 (defun url-news-fetch-message-id (host message-id)
  54   (let ((buf (generate-new-buffer " *url-news*")))
  55     (if (eq ?> (aref message-id (1- (length message-id))))
  56         nil
  57       (setq message-id (concat "<" message-id ">")))
  58     (if (cdr-safe (nntp-request-article message-id nil host buf))
  59         ;; Successfully retrieved the article
  60         nil
  61       (with-current-buffer buf
  62         (insert "Content-type: text/html\n\n"
  63                 "<html>\n"
  64                 " <head>\n"
  65                 "  <title>Error</title>\n"
  66                 " </head>\n"
  67                 " <body>\n"
  68                 "  <div>\n"
  69                 "   <h1>Error requesting article...</h1>\n"
  70                 "   <p>\n"
  71                 "    The status message returned by the NNTP server was:"
  72                 "<br><hr>\n"
  73                 "    <xmp>\n"
  74                 (nntp-status-message)
  75                 "    </xmp>\n"
  76                 "   </p>\n"
  77                 "   <p>\n"
  78                 "    If you If you feel this is an error, <a href=\""
  79                 "mailto:" url-bug-address "\">send mail</a>\n"
  80                 "   </p>\n"
  81                 "  </div>\n"
  82                 " </body>\n"
  83                 "</html>\n"
  84                 "<!-- Automatically generated by URL v" url-version " -->\n"
  85                 )))
  86     buf))
  87
  88 (defun url-news-fetch-newsgroup (newsgroup host)
  89   (declare (special gnus-group-buffer))
  90   (if (string-match "^/+" newsgroup)
  91       (setq newsgroup (substring newsgroup (match-end 0))))
  92   (if (string-match "/+$" newsgroup)
  93       (setq newsgroup (substring newsgroup 0 (match-beginning 0))))
  94
  95   ;; This saves us from checking new news if Gnus is already running
  96   ;; FIXME - is it relatively safe to use gnus-alive-p here? FIXME
  97   (if (or (not (get-buffer gnus-group-buffer))
  98           (with-current-buffer gnus-group-buffer
  99             (not (eq major-mode 'gnus-group-mode))))
 100       (gnus))
 101   (set-buffer gnus-group-buffer)
 102   (goto-char (point-min))
 103   (gnus-group-read-ephemeral-group newsgroup
 104                                    (list 'nntp host
 105                                          'nntp-open-connection-function
 106                                          nntp-open-connection-function)
 107                                    nil
 108                                    (cons (current-buffer) 'browse)))
 109
 110 ;;;###autoload
 111 (defun url-news (url)
 112   ;; Find a news reference
 113   (let* ((host (or (url-host url) url-news-server))
 114          (port (url-port url))
 115          (article-brackets nil)
 116          (buf nil)
 117          (article (url-unhex-string (url-filename url))))
 118     (url-news-open-host host port (url-user url) (url-password url))
 119     (cond
 120      ((string-match "@" article)        ; Its a specific article
 121       (setq buf (url-news-fetch-message-id host article)))
 122      ((string= article "")              ; List all newsgroups
 123       (gnus))
 124      (t                                 ; Whole newsgroup
 125       (url-news-fetch-newsgroup article host)))
 126     buf))
 127
 128 ;;;###autoload
 129 (defun url-snews (url)
 130   (let ((nntp-open-connection-function (if (eq 'tls url-gateway-method)
 131                                            nntp-open-tls-stream
 132                                          nntp-open-ssl-stream)))
 133     (url-news url)))
 134
 135 (provide 'url-news)
 136
 137 ;; arch-tag: 8975be13-04e8-4d38-bfff-47918e3ad311
 138 ;;; url-news.el ends here