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, 2008 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
  34 (defgroup url-news nil
  35   "News related options."
  36   :group 'url)
  37
  38 (defun url-news-open-host (host port user pass)
  39   (if (fboundp 'nnheader-init-server-buffer)
  40       (nnheader-init-server-buffer))
  41   (nntp-open-server host (list port))
  42   (if (and user pass)
  43       (progn
  44         (nntp-send-command "^.*\r?\n" "AUTHINFO USER" user)
  45         (nntp-send-command "^.*\r?\n" "AUTHINFO PASS" pass)
  46         (if (not (nntp-server-opened host))
  47             (url-warn 'url (format "NNTP authentication to `%s' as `%s' failed"
  48                                    host user))))))
  49
  50 (defun url-news-fetch-message-id (host message-id)
  51   (let ((buf (generate-new-buffer " *url-news*")))
  52     (if (eq ?> (aref message-id (1- (length message-id))))
  53         nil
  54       (setq message-id (concat "<" message-id ">")))
  55     (if (cdr-safe (nntp-request-article message-id nil host buf))
  56         ;; Successfully retrieved the article
  57         nil
  58       (with-current-buffer buf
  59         (insert "Content-type: text/html\n\n"
  60                 "<html>\n"
  61                 " <head>\n"
  62                 "  <title>Error</title>\n"
  63                 " </head>\n"
  64                 " <body>\n"
  65                 "  <div>\n"
  66                 "   <h1>Error requesting article...</h1>\n"
  67                 "   <p>\n"
  68                 "    The status message returned by the NNTP server was:"
  69                 "<br><hr>\n"
  70                 "    <xmp>\n"
  71                 (nntp-status-message)
  72                 "    </xmp>\n"
  73                 "   </p>\n"
  74                 "   <p>\n"
  75                 "    If you If you feel this is an error, <a href=\""
  76                 "mailto:" url-bug-address "\">send mail</a>\n"
  77                 "   </p>\n"
  78                 "  </div>\n"
  79                 " </body>\n"
  80                 "</html>\n"
  81                 "<!-- Automatically generated by URL v" url-version " -->\n"
  82                 )))
  83     buf))
  84
  85 (defvar gnus-group-buffer)
  86
  87 (defun url-news-fetch-newsgroup (newsgroup host)
  88   (if (string-match "^/+" newsgroup)
  89       (setq newsgroup (substring newsgroup (match-end 0))))
  90   (if (string-match "/+$" newsgroup)
  91       (setq newsgroup (substring newsgroup 0 (match-beginning 0))))
  92
  93   ;; This saves us from checking new news if Gnus is already running
  94   ;; FIXME - is it relatively safe to use gnus-alive-p here? FIXME
  95   (if (or (not (get-buffer gnus-group-buffer))
  96           (with-current-buffer gnus-group-buffer
  97             (not (eq major-mode 'gnus-group-mode))))
  98       (gnus))
  99   (set-buffer gnus-group-buffer)
 100   (goto-char (point-min))
 101   (gnus-group-read-ephemeral-group newsgroup
 102                                    (list 'nntp host
 103                                          (list 'nntp-open-connection-function
 104                                                nntp-open-connection-function))
 105                                    nil
 106                                    (cons (current-buffer) 'browse)))
 107
 108 ;;;###autoload
 109 (defun url-news (url)
 110   ;; Find a news reference
 111   (let* ((host (or (url-host url) url-news-server))
 112          (port (url-port url))
 113          (article-brackets nil)
 114          (buf nil)
 115          (article (url-unhex-string (url-filename url))))
 116     (url-news-open-host host port (url-user url) (url-password url))
 117     (cond
 118      ((string-match "@" article)        ; Its a specific article
 119       (setq buf (url-news-fetch-message-id host article)))
 120      ((string= article "")              ; List all newsgroups
 121       (gnus))
 122      (t                                 ; Whole newsgroup
 123       (url-news-fetch-newsgroup article host)))
 124     buf))
 125
 126 ;;;###autoload
 127 (defun url-snews (url)
 128   (let ((nntp-open-connection-function (if (eq 'ssl url-gateway-method)
 129                                            'nntp-open-ssl-stream
 130                                          'nntp-open-tls-stream)))
 131     (url-news url)))
 132
 133 (provide 'url-news)
 134
 135 ;; arch-tag: 8975be13-04e8-4d38-bfff-47918e3ad311
 136 ;;; url-news.el ends here