lisp/url/url-proxy.el

   1 ;;; url-proxy.el --- Proxy server support
   2
   3 ;; Copyright (C) 1999, 2004-2016 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 3 of the License, or
  12 ;; (at your option) 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.  If not, see <http://www.gnu.org/licenses/>.
  21
  22 ;;; Code:
  23
  24 (require 'url-parse)
  25 (autoload 'url-warn "url")
  26
  27 (defun url-default-find-proxy-for-url (urlobj host)
  28   (cond
  29    ((or (and (assoc "no_proxy" url-proxy-services)
  30              (string-match
  31               (cdr
  32                (assoc "no_proxy" url-proxy-services))
  33               host))
  34         (equal "www" (url-type urlobj)))
  35     "DIRECT")
  36    ((cdr (assoc (url-type urlobj) url-proxy-services))
  37     (concat "PROXY " (cdr (assoc (url-type urlobj) url-proxy-services))))
  38    ;;
  39    ;; Should check for socks
  40    ;;
  41    (t
  42     "DIRECT")))
  43
  44 (defvar url-proxy-locator 'url-default-find-proxy-for-url)
  45
  46 (defun url-find-proxy-for-url (url host)
  47   (let ((proxies (split-string (funcall url-proxy-locator url host) " *; *"))
  48         (proxy nil)
  49         (case-fold-search t))
  50     ;; Not sure how I should handle gracefully degrading from one proxy to
  51     ;; another, so for now just deal with the first one
  52     ;; (while proxies
  53     (if (listp proxies)
  54         (setq proxy (car proxies))
  55       (setq proxy proxies))
  56     (cond
  57      ((string-match "^direct" proxy) nil)
  58      ((string-match "^proxy +" proxy)
  59       (concat "http://" (substring proxy (match-end 0)) "/"))
  60      ((string-match "^socks +" proxy)
  61       (concat "socks://" (substring proxy (match-end 0))))
  62      (t
  63       (url-warn 'url (format "Unknown proxy directive: %s" proxy) 'critical)
  64       nil))))
  65
  66 (autoload 'url-http "url-http")
  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 ;;; url-proxy.el ends here