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8c8b8430 | 1 | ;;; url-methods.el --- Load URL schemes as needed |
ffc00a35 | 2 | |
71ddfde5 | 3 | ;; Copyright (C) 1996, 1997, 1998, 1999, 2004, |
ae940284 | 4 | ;; 2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc. |
ffc00a35 | 5 | |
8c8b8430 SM |
6 | ;; Keywords: comm, data, processes, hypermedia |
7 | ||
ffc00a35 SM |
8 | ;; This file is part of GNU Emacs. |
9 | ||
4936186e | 10 | ;; GNU Emacs is free software: you can redistribute it and/or modify |
ffc00a35 | 11 | ;; it under the terms of the GNU General Public License as published by |
4936186e GM |
12 | ;; the Free Software Foundation, either version 3 of the License, or |
13 | ;; (at your option) any later version. | |
14 | ||
ffc00a35 SM |
15 | ;; GNU Emacs is distributed in the hope that it will be useful, |
16 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | ;; GNU General Public License for more details. | |
4936186e | 19 | |
ffc00a35 | 20 | ;; You should have received a copy of the GNU General Public License |
4936186e | 21 | ;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. |
ffc00a35 SM |
22 | |
23 | ;;; Commentary: | |
24 | ||
25 | ;;; Code: | |
8c8b8430 SM |
26 | |
27 | (eval-when-compile | |
28 | (require 'cl)) | |
29 | ||
30 | ;; This loads up some of the small, silly URLs that I really don't | |
31 | ;; want to bother putting in their own separate files. | |
8c8b8430 SM |
32 | (require 'url-parse) |
33 | ||
34 | (defvar url-scheme-registry (make-hash-table :size 7 :test 'equal)) | |
35 | ||
36 | (defconst url-scheme-methods | |
37 | '((default-port . variable) | |
38 | (asynchronous-p . variable) | |
39 | (expand-file-name . function) | |
40 | (file-exists-p . function) | |
41 | (file-attributes . function) | |
42 | (parse-url . function) | |
43 | (file-symlink-p . function) | |
44 | (file-writable-p . function) | |
45 | (file-directory-p . function) | |
46 | (file-executable-p . function) | |
47 | (directory-files . function) | |
48 | (file-truename . function)) | |
49 | "Assoc-list of methods that each URL loader can provide.") | |
50 | ||
51 | (defconst url-scheme-default-properties | |
52 | (list 'name "unknown" | |
53 | 'loader 'url-scheme-default-loader | |
54 | 'default-port 0 | |
55 | 'expand-file-name 'url-identity-expander | |
56 | 'parse-url 'url-generic-parse-url | |
57 | 'asynchronous-p nil | |
58 | 'file-directory-p 'ignore | |
59 | 'file-truename (lambda (&rest args) | |
60 | (url-recreate-url (car args))) | |
61 | 'file-exists-p 'ignore | |
62 | 'file-attributes 'ignore)) | |
63 | ||
64 | (defun url-scheme-default-loader (url &optional callback cbargs) | |
65 | "Signal an error for an unknown URL scheme." | |
66 | (error "Unkown URL scheme: %s" (url-type url))) | |
67 | ||
68 | (defun url-scheme-register-proxy (scheme) | |
69 | "Automatically find a proxy for SCHEME and put it in `url-proxy-services'." | |
70 | (let* ((env-var (concat scheme "_proxy")) | |
71 | (env-proxy (or (getenv (upcase env-var)) | |
72 | (getenv (downcase env-var)))) | |
73 | (cur-proxy (assoc scheme url-proxy-services)) | |
74 | (urlobj nil)) | |
75 | ||
f316efd9 MB |
76 | ;; If env-proxy is an empty string, treat it as if it were nil |
77 | (when (and (stringp env-proxy) | |
78 | (string= env-proxy "")) | |
79 | (setq env-proxy nil)) | |
80 | ||
8c8b8430 SM |
81 | ;; Store any proxying information - this will not overwrite an old |
82 | ;; entry, so that people can still set this information in their | |
83 | ;; .emacs file | |
84 | (cond | |
85 | (cur-proxy nil) ; Keep their old settings | |
86 | ((null env-proxy) nil) ; No proxy setup | |
87 | ;; First check if its something like hostname:port | |
88 | ((string-match "^\\([^:]+\\):\\([0-9]+\\)$" env-proxy) | |
89 | (setq urlobj (url-generic-parse-url nil)) ; Get a blank object | |
d18ec89f SM |
90 | (setf (url-type urlobj) "http") |
91 | (setf (url-host urlobj) (match-string 1 env-proxy)) | |
92 | (setf (url-port urlobj) (string-to-number (match-string 2 env-proxy)))) | |
8c8b8430 SM |
93 | ;; Then check if its a fully specified URL |
94 | ((string-match url-nonrelative-link env-proxy) | |
95 | (setq urlobj (url-generic-parse-url env-proxy)) | |
d18ec89f SM |
96 | (setf (url-type urlobj) "http") |
97 | (setf (url-target urlobj) nil)) | |
8c8b8430 SM |
98 | ;; Finally, fall back on the assumption that its just a hostname |
99 | (t | |
100 | (setq urlobj (url-generic-parse-url nil)) ; Get a blank object | |
d18ec89f SM |
101 | (setf (url-type urlobj) "http") |
102 | (setf (url-host urlobj) env-proxy))) | |
8c8b8430 SM |
103 | |
104 | (if (and (not cur-proxy) urlobj) | |
105 | (progn | |
106 | (setq url-proxy-services | |
107 | (cons (cons scheme (format "%s:%d" (url-host urlobj) | |
108 | (url-port urlobj))) | |
109 | url-proxy-services)) | |
110 | (message "Using a proxy for %s..." scheme))))) | |
111 | ||
112 | (defun url-scheme-get-property (scheme property) | |
d1ce47b0 | 113 | "Get PROPERTY of a URL SCHEME. |
8c8b8430 SM |
114 | Will automatically try to load a backend from url-SCHEME.el if |
115 | it has not already been loaded." | |
116 | (setq scheme (downcase scheme)) | |
117 | (let ((desc (gethash scheme url-scheme-registry))) | |
118 | (if (not desc) | |
119 | (let* ((stub (concat "url-" scheme)) | |
120 | (loader (intern stub))) | |
121 | (condition-case () | |
122 | (require loader) | |
123 | (error nil)) | |
124 | (if (fboundp loader) | |
125 | (progn | |
126 | ;; Found the module to handle <scheme> URLs | |
127 | (url-scheme-register-proxy scheme) | |
128 | (setq desc (list 'name scheme | |
129 | 'loader loader)) | |
130 | (dolist (cell url-scheme-methods) | |
131 | (let ((symbol (intern-soft (format "%s-%s" stub (car cell)))) | |
132 | (type (cdr cell))) | |
133 | (if symbol | |
134 | (case type | |
135 | (function | |
136 | ;; Store the symbol name of a function | |
137 | (if (fboundp symbol) | |
138 | (setq desc (plist-put desc (car cell) symbol)))) | |
139 | (variable | |
140 | ;; Store the VALUE of a variable | |
141 | (if (boundp symbol) | |
142 | (setq desc (plist-put desc (car cell) | |
143 | (symbol-value symbol))))) | |
144 | (otherwise | |
145 | (error "Malformed url-scheme-methods entry: %S" | |
146 | cell)))))) | |
147 | (puthash scheme desc url-scheme-registry))))) | |
148 | (or (plist-get desc property) | |
149 | (plist-get url-scheme-default-properties property)))) | |
150 | ||
151 | (provide 'url-methods) | |
e5566bd5 | 152 | |
ffc00a35 SM |
153 | ;; arch-tag: 336863f8-5a07-4906-9be5-b3c6bcebbe67 |
154 | ;;; url-methods.el ends here |