code.delx.au - gnu-emacs/blob - lisp/url/url-news.el

   1 ;;; url-news.el --- News Uniform Resource Locator retrieval code
   2 ;; Keywords: comm, data, processes
   3
   4 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
   5 ;;; Copyright (c) 1996 - 1999, 2004 Free Software Foundation, Inc.
   6 ;;;
   7 ;;; This file is part of GNU Emacs.
   8 ;;;
   9 ;;; GNU Emacs is free software; you can redistribute it and/or modify
  10 ;;; it under the terms of the GNU General Public License as published by
  11 ;;; the Free Software Foundation; either version 2, or (at your option)
  12 ;;; any later version.
  13 ;;;
  14 ;;; GNU Emacs is distributed in the hope that it will be useful,
  15 ;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 ;;; GNU General Public License for more details.
  18 ;;;
  19 ;;; You should have received a copy of the GNU General Public License
  20 ;;; along with GNU Emacs; see the file COPYING.  If not, write to the
  21 ;;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  22 ;;; Boston, MA 02111-1307, USA.
  23 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
  24 (require 'url-vars)
  25 (require 'url-util)
  26 (require 'url-parse)
  27 (require 'nntp)
  28 (autoload 'url-warn "url")
  29 (autoload 'gnus-group-read-ephemeral-group "gnus-group")
  30 (eval-when-compile (require 'cl))
  31
  32 (defgroup url-news nil
  33   "News related options"
  34   :group 'url)
  35
  36 (defun url-news-open-host (host port user pass)
  37   (if (fboundp 'nnheader-init-server-buffer)
  38       (nnheader-init-server-buffer))
  39   (nntp-open-server host (list (string-to-int port)))
  40   (if (and user pass)
  41       (progn
  42         (nntp-send-command "^.*\r?\n" "AUTHINFO USER" user)
  43         (nntp-send-command "^.*\r?\n" "AUTHINFO PASS" pass)
  44         (if (not (nntp-server-opened host))
  45             (url-warn 'url (format "NNTP authentication to `%s' as `%s' failed"
  46                                    host user))))))
  47
  48 (defun url-news-fetch-message-id (host message-id)
  49   (let ((buf (generate-new-buffer " *url-news*")))
  50     (if (eq ?> (aref message-id (1- (length message-id))))
  51         nil
  52       (setq message-id (concat "<" message-id ">")))
  53     (if (cdr-safe (nntp-request-article message-id nil host buf))
  54         ;; Successfully retrieved the article
  55         nil
  56       (save-excursion
  57         (set-buffer buf)
  58         (insert "Content-type: text/html\n\n"
  59                 "<html>\n"
  60                 " <head>\n"
  61                 "  <title>Error</title>\n"
  62                 " </head>\n"
  63                 " <body>\n"
  64                 "  <div>\n"
  65                 "   <h1>Error requesting article...</h1>\n"
  66                 "   <p>\n"
  67                 "    The status message returned by the NNTP server was:"
  68                 "<br><hr>\n"
  69                 "    <xmp>\n"
  70                 (nntp-status-message)
  71                 "    </xmp>\n"
  72                 "   </p>\n"
  73                 "   <p>\n"
  74                 "    If you If you feel this is an error, <a href=\""
  75                 "mailto:" url-bug-address "\">send mail</a>\n"
  76                 "   </p>\n"
  77                 "  </div>\n"
  78                 " </body>\n"
  79                 "</html>\n"
  80                 "<!-- Automatically generated by URL v" url-version " -->\n"
  81                 )))
  82     buf))
  83
  84 (defun url-news-fetch-newsgroup (newsgroup host)
  85   (declare (special gnus-group-buffer))
  86   (if (string-match "^/+" newsgroup)
  87       (setq newsgroup (substring newsgroup (match-end 0))))
  88   (if (string-match "/+$" newsgroup)
  89       (setq newsgroup (substring newsgroup 0 (match-beginning 0))))
  90
  91   ;; This saves us from checking new news if Gnus is already running
  92   ;; FIXME - is it relatively safe to use gnus-alive-p here? FIXME
  93   (if (or (not (get-buffer gnus-group-buffer))
  94           (save-excursion
  95             (set-buffer gnus-group-buffer)
  96             (not (eq major-mode 'gnus-group-mode))))
  97       (gnus))
  98   (set-buffer gnus-group-buffer)
  99   (goto-char (point-min))
 100   (gnus-group-read-ephemeral-group newsgroup
 101                                    (list 'nntp host
 102                                          'nntp-open-connection-function
 103                                          nntp-open-connection-function)
 104                                    nil
 105                                    (cons (current-buffer) 'browse)))
 106
 107 ;;;###autoload
 108 (defun url-news (url)
 109   ;; Find a news reference
 110   (let* ((host (or (url-host url) url-news-server))
 111          (port (url-port url))
 112          (article-brackets nil)
 113          (buf nil)
 114          (article (url-filename url)))
 115     (url-news-open-host host port (url-user url) (url-password url))
 116     (setq article (url-unhex-string article))
 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 'tls url-gateway-method)
 129                                            nntp-open-tls-stream
 130                                          nntp-open-ssl-stream)))
 131     (url-news url)))
 132
 133 (provide 'url-news)
 134
 135 ;;; arch-tag: 8975be13-04e8-4d38-bfff-47918e3ad311