mirror of
https://git.savannah.gnu.org/git/emacs.git
synced 2024-12-15 09:47:20 +00:00
325 lines
12 KiB
EmacsLisp
325 lines
12 KiB
EmacsLisp
;;; url.el --- Uniform Resource Locator retrieval tool
|
|
|
|
;; Copyright (C) 1996, 1997, 1998, 1999, 2001, 2004,
|
|
;; 2005, 2006, 2007 Free Software Foundation, Inc.
|
|
|
|
;; Author: Bill Perry <wmperry@gnu.org>
|
|
;; 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 2, 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; see the file COPYING. If not, write to the
|
|
;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
|
|
;; Boston, MA 02110-1301, USA.
|
|
|
|
;;; Commentary:
|
|
|
|
;; Registered URI schemes: http://www.iana.org/assignments/uri-schemes
|
|
|
|
;;; Code:
|
|
|
|
(eval-when-compile (require 'cl))
|
|
|
|
(eval-when-compile
|
|
(require 'mm-decode)
|
|
(require 'mm-view))
|
|
|
|
(require 'mailcap)
|
|
(require 'url-vars)
|
|
(require 'url-cookie)
|
|
(require 'url-history)
|
|
(require 'url-expand)
|
|
(require 'url-privacy)
|
|
(require 'url-methods)
|
|
(require 'url-proxy)
|
|
(require 'url-parse)
|
|
(require 'url-util)
|
|
|
|
;; Fixme: customize? convert-standard-filename?
|
|
(defvar url-configuration-directory
|
|
(cond
|
|
((file-directory-p "~/.url") "~/.url")
|
|
((file-directory-p user-emacs-directory)
|
|
(concat user-emacs-directory "url"))
|
|
(t "~/.url")))
|
|
|
|
(defun url-do-setup ()
|
|
"Setup the url package.
|
|
This is to avoid conflict with user settings if URL is dumped with
|
|
Emacs."
|
|
(unless url-setup-done
|
|
|
|
;; Make OS/2 happy
|
|
;;(push '("http" "80") tcp-binary-process-input-services)
|
|
|
|
(mailcap-parse-mailcaps)
|
|
(mailcap-parse-mimetypes)
|
|
|
|
;; Register all the authentication schemes we can handle
|
|
(url-register-auth-scheme "basic" nil 4)
|
|
(url-register-auth-scheme "digest" nil 7)
|
|
|
|
(setq url-cookie-file
|
|
(or url-cookie-file
|
|
(expand-file-name "cookies" url-configuration-directory)))
|
|
|
|
(setq url-history-file
|
|
(or url-history-file
|
|
(expand-file-name "history" url-configuration-directory)))
|
|
|
|
;; Parse the global history file if it exists, so that it can be used
|
|
;; for URL completion, etc.
|
|
(url-history-parse-history)
|
|
(url-history-setup-save-timer)
|
|
|
|
;; Ditto for cookies
|
|
(url-cookie-setup-save-timer)
|
|
(url-cookie-parse-file url-cookie-file)
|
|
|
|
;; Read in proxy gateways
|
|
(let ((noproxy (and (not (assoc "no_proxy" url-proxy-services))
|
|
(or (getenv "NO_PROXY")
|
|
(getenv "no_PROXY")
|
|
(getenv "no_proxy")))))
|
|
(if noproxy
|
|
(setq url-proxy-services
|
|
(cons (cons "no_proxy"
|
|
(concat "\\("
|
|
(mapconcat
|
|
(lambda (x)
|
|
(cond
|
|
((= x ?,) "\\|")
|
|
((= x ? ) "")
|
|
((= x ?.) (regexp-quote "."))
|
|
((= x ?*) ".*")
|
|
((= x ??) ".")
|
|
(t (char-to-string x))))
|
|
noproxy "") "\\)"))
|
|
url-proxy-services))))
|
|
|
|
(url-setup-privacy-info)
|
|
(run-hooks 'url-load-hook)
|
|
(setq url-setup-done t)))
|
|
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
;;; Retrieval functions
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
|
|
(defvar url-redirect-buffer nil
|
|
"New buffer into which the retrieval will take place.
|
|
Sometimes while retrieving a URL, the URL library needs to use another buffer
|
|
than the one returned initially by `url-retrieve'. In this case, it sets this
|
|
variable in the original buffer as a forwarding pointer.")
|
|
|
|
;;;###autoload
|
|
(defun url-retrieve (url callback &optional cbargs)
|
|
"Retrieve URL asynchronously and call CALLBACK with CBARGS when finished.
|
|
URL is either a string or a parsed URL.
|
|
|
|
CALLBACK is called when the object has been completely retrieved, with
|
|
the current buffer containing the object, and any MIME headers associated
|
|
with it. It is called as (apply CALLBACK STATUS CBARGS).
|
|
STATUS is a list with an even number of elements representing
|
|
what happened during the request, with most recent events first,
|
|
or an empty list if no events have occurred. Each pair is one of:
|
|
|
|
\(:redirect REDIRECTED-TO) - the request was redirected to this URL
|
|
\(:error (ERROR-SYMBOL . DATA)) - an error occurred. The error can be
|
|
signaled with (signal ERROR-SYMBOL DATA).
|
|
|
|
Return the buffer URL will load into, or nil if the process has
|
|
already completed (i.e. URL was a mailto URL or similar; in this case
|
|
the callback is not called).
|
|
|
|
The variables `url-request-data', `url-request-method' and
|
|
`url-request-extra-headers' can be dynamically bound around the
|
|
request; dynamic binding of other variables doesn't necessarily
|
|
take effect."
|
|
;;; XXX: There is code in Emacs that does dynamic binding
|
|
;;; of the following variables around url-retrieve:
|
|
;;; url-standalone-mode, url-gateway-unplugged, w3-honor-stylesheets,
|
|
;;; url-confirmation-func, url-cookie-multiple-line,
|
|
;;; url-cookie-{{,secure-}storage,confirmation}
|
|
;;; url-standalone-mode and url-gateway-unplugged should work as
|
|
;;; usual. url-confirmation-func is only used in nnwarchive.el and
|
|
;;; webmail.el; the latter should be updated. Is
|
|
;;; url-cookie-multiple-line needed anymore? The other url-cookie-*
|
|
;;; are (for now) only used in synchronous retrievals.
|
|
(url-retrieve-internal url callback (cons nil cbargs)))
|
|
|
|
(defun url-retrieve-internal (url callback cbargs)
|
|
"Internal function; external interface is `url-retrieve'.
|
|
CBARGS is what the callback will actually receive - the first item is
|
|
the list of events, as described in the docstring of `url-retrieve'."
|
|
(url-do-setup)
|
|
(url-gc-dead-buffers)
|
|
(if (stringp url)
|
|
(set-text-properties 0 (length url) nil url))
|
|
(if (not (vectorp url))
|
|
(setq url (url-generic-parse-url url)))
|
|
(if (not (functionp callback))
|
|
(error "Must provide a callback function to url-retrieve"))
|
|
(unless (url-type url)
|
|
(error "Bad url: %s" (url-recreate-url url)))
|
|
(let ((loader (url-scheme-get-property (url-type url) 'loader))
|
|
(url-using-proxy (if (url-host url)
|
|
(url-find-proxy-for-url url (url-host url))))
|
|
(buffer nil)
|
|
(asynch (url-scheme-get-property (url-type url) 'asynchronous-p)))
|
|
(if url-using-proxy
|
|
(setq asynch t
|
|
loader 'url-proxy))
|
|
(if asynch
|
|
(setq buffer (funcall loader url callback cbargs))
|
|
(setq buffer (funcall loader url))
|
|
(if buffer
|
|
(with-current-buffer buffer
|
|
(apply callback cbargs))))
|
|
(if url-history-track
|
|
(url-history-update-url url (current-time)))
|
|
buffer))
|
|
|
|
;;;###autoload
|
|
(defun url-retrieve-synchronously (url)
|
|
"Retrieve URL synchronously.
|
|
Return the buffer containing the data, or nil if there are no data
|
|
associated with it (the case for dired, info, or mailto URLs that need
|
|
no further processing). URL is either a string or a parsed URL."
|
|
(url-do-setup)
|
|
|
|
(lexical-let ((retrieval-done nil)
|
|
(asynch-buffer nil))
|
|
(setq asynch-buffer
|
|
(url-retrieve url (lambda (&rest ignored)
|
|
(url-debug 'retrieval "Synchronous fetching done (%S)" (current-buffer))
|
|
(setq retrieval-done t
|
|
asynch-buffer (current-buffer)))))
|
|
(if (null asynch-buffer)
|
|
;; We do not need to do anything, it was a mailto or something
|
|
;; similar that takes processing completely outside of the URL
|
|
;; package.
|
|
nil
|
|
(let ((proc (get-buffer-process asynch-buffer)))
|
|
;; If the access method was synchronous, `retrieval-done' should
|
|
;; hopefully already be set to t. If it is nil, and `proc' is also
|
|
;; nil, it implies that the async process is not running in
|
|
;; asynch-buffer. This happens e.g. for FTP files. In such a case
|
|
;; url-file.el should probably set something like a `url-process'
|
|
;; buffer-local variable so we can find the exact process that we
|
|
;; should be waiting for. In the mean time, we'll just wait for any
|
|
;; process output.
|
|
(while (not retrieval-done)
|
|
(url-debug 'retrieval
|
|
"Spinning in url-retrieve-synchronously: %S (%S)"
|
|
retrieval-done asynch-buffer)
|
|
(if (buffer-local-value 'url-redirect-buffer asynch-buffer)
|
|
(setq proc (get-buffer-process
|
|
(setq asynch-buffer
|
|
(buffer-local-value 'url-redirect-buffer
|
|
asynch-buffer))))
|
|
(if (and proc (memq (process-status proc)
|
|
'(closed exit signal failed))
|
|
;; Make sure another process hasn't been started.
|
|
(eq proc (or (get-buffer-process asynch-buffer) proc)))
|
|
;; FIXME: It's not clear whether url-retrieve's callback is
|
|
;; guaranteed to be called or not. It seems that url-http
|
|
;; decides sometimes consciously not to call it, so it's not
|
|
;; clear that it's a bug, but even then we need to decide how
|
|
;; url-http can then warn us that the download has completed.
|
|
;; In the mean time, we use this here workaround.
|
|
;; XXX: The callback must always be called. Any
|
|
;; exception is a bug that should be fixed, not worked
|
|
;; around.
|
|
(setq retrieval-done t))
|
|
;; We used to use `sit-for' here, but in some cases it wouldn't
|
|
;; work because apparently pending keyboard input would always
|
|
;; interrupt it before it got a chance to handle process input.
|
|
;; `sleep-for' was tried but it lead to other forms of
|
|
;; hanging. --Stef
|
|
(unless (or (with-local-quit
|
|
(accept-process-output proc))
|
|
(null proc))
|
|
;; accept-process-output returned nil, maybe because the process
|
|
;; exited (and may have been replaced with another). If we got
|
|
;; a quit, just stop.
|
|
(when quit-flag
|
|
(delete-process proc))
|
|
(setq proc (and (not quit-flag)
|
|
(get-buffer-process asynch-buffer)))))))
|
|
asynch-buffer)))
|
|
|
|
(defun url-mm-callback (&rest ignored)
|
|
(let ((handle (mm-dissect-buffer t)))
|
|
(url-mark-buffer-as-dead (current-buffer))
|
|
(with-current-buffer
|
|
(generate-new-buffer (url-recreate-url url-current-object))
|
|
(if (eq (mm-display-part handle) 'external)
|
|
(progn
|
|
(set-process-sentinel
|
|
;; Fixme: this shouldn't have to know the form of the
|
|
;; undisplayer produced by `mm-display-part'.
|
|
(get-buffer-process (cdr (mm-handle-undisplayer handle)))
|
|
`(lambda (proc event)
|
|
(mm-destroy-parts (quote ,handle))))
|
|
(message "Viewing externally")
|
|
(kill-buffer (current-buffer)))
|
|
(display-buffer (current-buffer))
|
|
(add-hook 'kill-buffer-hook
|
|
`(lambda () (mm-destroy-parts ',handle))
|
|
nil
|
|
t)))))
|
|
|
|
(defun url-mm-url (url)
|
|
"Retrieve URL and pass to the appropriate viewing application."
|
|
;; These requires could advantageously be moved to url-mm-callback or
|
|
;; turned into autoloads, but I suspect that it would introduce some bugs
|
|
;; because loading those files from a process sentinel or filter may
|
|
;; result in some undesirable carner cases.
|
|
(require 'mm-decode)
|
|
(require 'mm-view)
|
|
(url-retrieve url 'url-mm-callback nil))
|
|
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
;;; Miscellaneous
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
(defvar url-dead-buffer-list nil)
|
|
|
|
(defun url-mark-buffer-as-dead (buff)
|
|
(push buff url-dead-buffer-list))
|
|
|
|
(defun url-gc-dead-buffers ()
|
|
(let ((buff))
|
|
(while (setq buff (pop url-dead-buffer-list))
|
|
(if (buffer-live-p buff)
|
|
(kill-buffer buff)))))
|
|
|
|
(cond
|
|
((fboundp 'display-warning)
|
|
(defalias 'url-warn 'display-warning))
|
|
((fboundp 'warn)
|
|
(defun url-warn (class message &optional level)
|
|
(warn "(%s/%s) %s" class (or level 'warning) message)))
|
|
(t
|
|
(defun url-warn (class message &optional level)
|
|
(with-current-buffer (get-buffer-create "*URL-WARNINGS*")
|
|
(goto-char (point-max))
|
|
(save-excursion
|
|
(insert (format "(%s/%s) %s\n" class (or level 'warning) message)))
|
|
(display-buffer (current-buffer))))))
|
|
|
|
(provide 'url)
|
|
|
|
;; arch-tag: bc182f1f-d187-4f10-b961-47af2066579a
|
|
;;; url.el ends here
|