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| | ;;; url-proxy.el --- Proxy server support -*- lexical-binding: t; -*-
;; Copyright (C) 1999, 2004-2023 Free Software Foundation, Inc.
;; Keywords: comm, data, processes, hypermedia
;; 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/>.
;;; Commentary:
;;; Code:
(require 'url-parse)
(defconst url-proxy--socks-scheme-regexp
(rx bot "socks" (? (or "4" "4a" "5" "5h")) "://"))
(defun url-default-find-proxy-for-url (urlobj host)
(cond
((or (and (assoc "no_proxy" url-proxy-services)
(string-match
(cdr
(assoc "no_proxy" url-proxy-services))
host))
(equal "www" (url-type urlobj)))
"DIRECT")
((cdr (assoc (url-type urlobj) url-proxy-services))
(let ((found (alist-get (url-type urlobj) url-proxy-services
nil nil #'equal)))
(concat (if (string-match url-proxy--socks-scheme-regexp found)
"SOCKS "
"PROXY ")
found)))
;;
;; Should check for socks
;;
(t
"DIRECT")))
(defvar url-proxy-locator 'url-default-find-proxy-for-url)
(defun url-find-proxy-for-url (url host)
(let ((proxies (split-string (funcall url-proxy-locator url host) " *; *"))
(proxy nil)
(case-fold-search t))
;; Not sure how I should handle gracefully degrading from one proxy to
;; another, so for now just deal with the first one
;; (while proxies
(setq proxy (if (listp proxies) (car proxies) proxies))
(cond
((string-match "^DIRECT" proxy) nil)
((string-match "^PROXY +" proxy)
(concat "http://" (substring proxy (match-end 0)) "/"))
((string-match "^SOCKS +" proxy)
(if-let* ((m (substring proxy (match-end 0)))
((string-match url-proxy--socks-scheme-regexp m)))
m
(concat "socks://" m)))
(t
(display-warning 'url (format "Unknown proxy directive: %s" proxy) :error)
nil))))
(autoload 'url-http "url-http")
(defun url-proxy (url callback &optional cbargs)
;; Retrieve URL from a proxy.
;; Expects `url-using-proxy' to be bound to the specific proxy to use."
(setq url-using-proxy (url-generic-parse-url url-using-proxy))
(cond
((string= (url-type url-using-proxy) "http")
(url-http url callback cbargs))
((and (string-prefix-p "socks" (url-type url-using-proxy))
(string-prefix-p "http" (url-type url)))
(url-http url callback cbargs))
(t
(error "Don't know how to use proxy `%s'" url-using-proxy))))
(provide 'url-proxy)
;;; url-proxy.el ends here
|