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;;; url-news.el --- News Uniform Resource Locator retrieval code -*- lexical-binding: t; -*-
;; Copyright (C) 1996-1999, 2004-2021 Free Software Foundation, Inc.
;; Keywords: comm, data, processes
;; This file is part of GNU Emacs.
;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
;;; Code:
(require 'url-vars)
(require 'url-util)
(require 'url-parse)
(require 'nntp)
(autoload 'gnus-group-read-ephemeral-group "gnus-group")
;; Unused.
;;; (defgroup url-news nil
;;; "News related options."
;;; :group 'url)
(defun url-news-open-host (host port user pass)
(if (fboundp 'nnheader-init-server-buffer)
(nnheader-init-server-buffer))
(nntp-open-server host (list port))
(if (and user pass)
(progn
(nntp-send-command "^.*\r?\n" "AUTHINFO USER" user)
(nntp-send-command "^.*\r?\n" "AUTHINFO PASS" pass)
(if (not (nntp-server-opened host))
(display-warning 'url (format "NNTP authentication to `%s' as `%s' failed"
host user))))))
(defun url-news-fetch-message-id (host message-id)
(let ((buf (generate-new-buffer " *url-news*")))
(if (eq ?> (aref message-id (1- (length message-id))))
nil
(setq message-id (concat "<" message-id ">")))
(if (cdr-safe (nntp-request-article message-id nil host buf))
;; Successfully retrieved the article
nil
(with-current-buffer buf
(insert "Content-type: text/html\n\n"
"<html>\n"
" <head>\n"
" <title>Error</title>\n"
" </head>\n"
" <body>\n"
" <div>\n"
" <h1>Error requesting article...</h1>\n"
" <p>\n"
" The status message returned by the NNTP server was:"
"<br><hr>\n"
" <xmp>\n"
(nntp-status-message)
" </xmp>\n"
" </p>\n"
" <p>\n"
" If you feel this is an error, M-x report-emacs-bug RET.\n"
" </p>\n"
" </div>\n"
" </body>\n"
"</html>\n"
"<!-- Automatically generated by URL in Emacs " emacs-version " -->\n"
)))
buf))
(defvar gnus-group-buffer)
(defun url-news-fetch-newsgroup (newsgroup host)
(if (string-match "^/+" newsgroup)
(setq newsgroup (substring newsgroup (match-end 0))))
(if (string-match "/+$" newsgroup)
(setq newsgroup (substring newsgroup 0 (match-beginning 0))))
;; This saves us from checking new news if Gnus is already running
;; FIXME - is it relatively safe to use gnus-alive-p here? FIXME
(if (or (not (get-buffer gnus-group-buffer))
(with-current-buffer gnus-group-buffer
(not (eq major-mode 'gnus-group-mode))))
(gnus))
(set-buffer gnus-group-buffer)
(goto-char (point-min))
(gnus-group-read-ephemeral-group newsgroup
(list 'nntp host
(list 'nntp-open-connection-function
nntp-open-connection-function))
nil
(cons (current-buffer) 'browse)))
;;;###autoload
(defun url-news (url)
;; Find a news reference
(let* ((host (or (url-host url) url-news-server))
(port (url-port url))
;; (article-brackets nil)
(buf nil)
(article (url-unhex-string (url-filename url))))
(url-news-open-host host port (url-user url) (url-password url))
(cond
((string-match "@" article) ; Its a specific article
(setq buf (url-news-fetch-message-id host article)))
((string= article "") ; List all newsgroups
(gnus))
(t ; Whole newsgroup
(url-news-fetch-newsgroup article host)))
buf))
;;;###autoload
(defun url-snews (url)
(let ((nntp-open-connection-function (if (eq 'ssl url-gateway-method)
'nntp-open-ssl-stream
'nntp-open-tls-stream)))
(url-news url)))
(provide 'url-news)
;;; url-news.el ends here
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