lisp/url/url-proxy.el

   1 ;;; url-proxy.el --- Proxy server support
   2
   3 ;; Copyright (C) 1999, 2004, 2005, 2006 Free Software Foundation, Inc.
   4
   5 ;; Keywords: comm, data, processes, hypermedia
   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., 51 Franklin Street, Fifth Floor,
  22 ;; Boston, MA 02110-1301, USA.
  23
  24 ;;; Code:
  25
  26 (require 'url-parse)
  27 (autoload 'url-warn "url")
  28
  29 (defun url-default-find-proxy-for-url (urlobj host)
  30   (cond
  31    ((or (and (assoc "no_proxy" url-proxy-services)
  32              (string-match
  33               (cdr
  34                (assoc "no_proxy" url-proxy-services))
  35               host))
  36         (equal "www" (url-type urlobj)))
  37     "DIRECT")
  38    ((cdr (assoc (url-type urlobj) url-proxy-services))
  39     (concat "PROXY " (cdr (assoc (url-type urlobj) url-proxy-services))))
  40    ;;
  41    ;; Should check for socks
  42    ;;
  43    (t
  44     "DIRECT")))
  45
  46 (defvar url-proxy-locator 'url-default-find-proxy-for-url)
  47
  48 (defun url-find-proxy-for-url (url host)
  49   (let ((proxies (split-string (funcall url-proxy-locator url host) " *; *"))
  50         (proxy nil)
  51         (case-fold-search t))
  52     ;; Not sure how I should handle gracefully degrading from one proxy to
  53     ;; another, so for now just deal with the first one
  54     ;; (while proxies
  55     (if (listp proxies)
  56         (setq proxy (car proxies))
  57       (setq proxy proxies))
  58     (cond
  59      ((string-match "^direct" proxy) nil)
  60      ((string-match "^proxy +" proxy)
  61       (concat "http://" (substring proxy (match-end 0)) "/"))
  62      ((string-match "^socks +" proxy)
  63       (concat "socks://" (substring proxy (match-end 0))))
  64      (t
  65       (url-warn 'url (format "Unknown proxy directive: %s" proxy) 'critical)
  66       nil))))
  67
  68 (defun url-proxy (url callback &optional cbargs)
  69   ;; Retrieve URL from a proxy.
  70   ;; Expects `url-using-proxy' to be bound to the specific proxy to use."
  71   (setq url-using-proxy (url-generic-parse-url url-using-proxy))
  72
  73   (cond
  74    ((string= (url-type url-using-proxy) "http")
  75     (url-http url callback cbargs))
  76    (t
  77     (error "Don't know how to use proxy `%s'" url-using-proxy))))
  78
  79 (provide 'url-proxy)
  80
  81 ;;; arch-tag: 4ff8882e-e498-42b7-abc5-acb449cdbc62
  82 ;;; url-proxy.el ends here