1 ;;; url-http.el --- HTTP retrieval routines
3 ;; Copyright (C) 1999, 2001, 2004-2012 Free Software Foundation, Inc.
5 ;; Author: Bill Perry <wmperry@gnu.org>
6 ;; Keywords: comm, data, processes
8 ;; This file is part of GNU Emacs.
10 ;; GNU Emacs is free software: you can redistribute it and/or modify
11 ;; it under the terms of the GNU General Public License as published by
12 ;; the Free Software Foundation, either version 3 of the License, or
13 ;; (at your option) any later version.
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.
20 ;; You should have received a copy of the GNU General Public License
21 ;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
27 (eval-when-compile (require 'cl
))
28 (defvar url-http-extra-headers
)
29 (defvar url-http-target-url
)
30 (defvar url-http-no-retry
)
31 (defvar url-http-proxy
)
32 (defvar url-http-connection-opened
)
40 (autoload 'url-cache-create-filename
"url-cache")
42 (defconst url-http-default-port
80 "Default HTTP port.")
43 (defconst url-http-asynchronous-p t
"HTTP retrievals are asynchronous.")
44 (defalias 'url-http-expand-file-name
'url-default-expander
)
46 (defvar url-http-real-basic-auth-storage nil
)
47 (defvar url-http-proxy-basic-auth-storage nil
)
49 (defvar url-http-open-connections
(make-hash-table :test
'equal
51 "A hash table of all open network connections.")
53 (defvar url-http-version
"1.1"
54 "What version of HTTP we advertise, as a string.
55 Valid values are 1.1 and 1.0.
56 This is only useful when debugging the HTTP subsystem.
58 Setting this to 1.0 will tell servers not to send chunked encoding,
59 and other HTTP/1.1 specific features.")
61 (defvar url-http-attempt-keepalives t
62 "Whether to use a single TCP connection multiple times in HTTP.
63 This is only useful when debugging the HTTP subsystem. Setting to
64 nil will explicitly close the connection to the server after every
67 (defconst url-http-codes
68 '((100 continue
"Continue with request")
69 (101 switching-protocols
"Switching protocols")
70 (102 processing
"Processing (Added by DAV)")
72 (201 created
"Created")
73 (202 accepted
"Accepted")
74 (203 non-authoritative
"Non-authoritative information")
75 (204 no-content
"No content")
76 (205 reset-content
"Reset content")
77 (206 partial-content
"Partial content")
78 (207 multi-status
"Multi-status (Added by DAV)")
79 (300 multiple-choices
"Multiple choices")
80 (301 moved-permanently
"Moved permanently")
82 (303 see-other
"See other")
83 (304 not-modified
"Not modified")
84 (305 use-proxy
"Use proxy")
85 (307 temporary-redirect
"Temporary redirect")
86 (400 bad-request
"Bad Request")
87 (401 unauthorized
"Unauthorized")
88 (402 payment-required
"Payment required")
89 (403 forbidden
"Forbidden")
90 (404 not-found
"Not found")
91 (405 method-not-allowed
"Method not allowed")
92 (406 not-acceptable
"Not acceptable")
93 (407 proxy-authentication-required
"Proxy authentication required")
94 (408 request-timeout
"Request time-out")
95 (409 conflict
"Conflict")
97 (411 length-required
"Length required")
98 (412 precondition-failed
"Precondition failed")
99 (413 request-entity-too-large
"Request entity too large")
100 (414 request-uri-too-large
"Request-URI too large")
101 (415 unsupported-media-type
"Unsupported media type")
102 (416 requested-range-not-satisfiable
"Requested range not satisfiable")
103 (417 expectation-failed
"Expectation failed")
104 (422 unprocessable-entity
"Unprocessable Entity (Added by DAV)")
105 (423 locked
"Locked")
106 (424 failed-Dependency
"Failed Dependency")
107 (500 internal-server-error
"Internal server error")
108 (501 not-implemented
"Not implemented")
109 (502 bad-gateway
"Bad gateway")
110 (503 service-unavailable
"Service unavailable")
111 (504 gateway-timeout
"Gateway time-out")
112 (505 http-version-not-supported
"HTTP version not supported")
113 (507 insufficient-storage
"Insufficient storage"))
114 "The HTTP return codes and their text.")
117 ;; These are all macros so that they are hidden from external sight
118 ;; when the file is byte-compiled.
120 ;; This allows us to expose just the entry points we want.
122 ;; These routines will allow us to implement persistent HTTP
124 (defsubst url-http-debug
(&rest args
)
126 (let ((proc (get-buffer-process (current-buffer))))
127 ;; The user hit C-g, honor it! Some things can get in an
128 ;; incredibly tight loop (chunked encoding)
131 (set-process-sentinel proc nil
)
132 (set-process-filter proc nil
)))
133 (error "Transfer interrupted!")))
134 (apply 'url-debug
'http args
))
136 (defun url-http-mark-connection-as-busy (host port proc
)
137 (url-http-debug "Marking connection as busy: %s:%d %S" host port proc
)
138 (set-process-query-on-exit-flag proc t
)
139 (puthash (cons host port
)
140 (delq proc
(gethash (cons host port
) url-http-open-connections
))
141 url-http-open-connections
)
144 (defun url-http-mark-connection-as-free (host port proc
)
145 (url-http-debug "Marking connection as free: %s:%d %S" host port proc
)
146 (when (memq (process-status proc
) '(open run connect
))
147 (set-process-buffer proc nil
)
148 (set-process-sentinel proc
'url-http-idle-sentinel
)
149 (set-process-query-on-exit-flag proc nil
)
150 (puthash (cons host port
)
151 (cons proc
(gethash (cons host port
) url-http-open-connections
))
152 url-http-open-connections
))
155 (defun url-http-find-free-connection (host port
)
156 (let ((conns (gethash (cons host port
) url-http-open-connections
))
158 (while (and conns
(not connection
))
159 (if (not (memq (process-status (car conns
)) '(run open connect
)))
161 (url-http-debug "Cleaning up dead process: %s:%d %S"
162 host port
(car conns
))
163 (url-http-idle-sentinel (car conns
) nil
))
164 (setq connection
(car conns
))
165 (url-http-debug "Found existing connection: %s:%d %S" host port connection
))
168 (url-http-debug "Reusing existing connection: %s:%d" host port
)
169 (url-http-debug "Contacting host: %s:%d" host port
))
170 (url-lazy-message "Contacting host: %s:%d" host port
)
173 (let ((buf (generate-new-buffer " *url-http-temp*")))
174 ;; `url-open-stream' needs a buffer in which to do things
175 ;; like authentication. But we use another buffer afterwards.
177 (let ((proc (url-open-stream host buf host port
)))
178 ;; url-open-stream might return nil.
179 (when (processp proc
)
180 ;; Drop the temp buffer link before killing the buffer.
181 (set-process-buffer proc nil
)
182 (setq connection proc
)))
183 ;; If there was an error on connect, make sure we don't
185 (when (get-buffer-process buf
)
186 (set-process-query-on-exit-flag (get-buffer-process buf
) nil
))
190 (url-http-mark-connection-as-busy host port connection
))))
192 ;; Building an HTTP request
193 (defun url-http-user-agent-string ()
194 (if (or (eq url-privacy-level
'paranoid
)
195 (and (listp url-privacy-level
)
196 (memq 'agent url-privacy-level
)))
198 (format "User-Agent: %sURL/%s%s\r\n"
200 (concat url-package-name
"/" url-package-version
" ")
204 ((and url-os-type url-system-type
)
205 (concat " (" url-os-type
"; " url-system-type
")"))
206 ((or url-os-type url-system-type
)
207 (concat " (" (or url-system-type url-os-type
) ")"))
210 (defun url-http-create-request (&optional ref-url
)
211 "Create an HTTP request for `url-http-target-url', referred to by REF-URL."
212 (declare (special proxy-info
213 url-http-method url-http-data
214 url-http-extra-headers
))
215 (let* ((extra-headers)
217 (no-cache (cdr-safe (assoc "Pragma" url-http-extra-headers
)))
218 (using-proxy url-http-proxy
)
219 (proxy-auth (if (or (cdr-safe (assoc "Proxy-Authorization"
220 url-http-extra-headers
))
223 (let ((url-basic-auth-storage
224 'url-http-proxy-basic-auth-storage
))
225 (url-get-authentication url-http-target-url nil
'any nil
))))
226 (real-fname (url-filename url-http-target-url
))
227 (host (url-host url-http-target-url
))
228 (auth (if (cdr-safe (assoc "Authorization" url-http-extra-headers
))
230 (url-get-authentication (or
231 (and (boundp 'proxy-info
)
233 url-http-target-url
) nil
'any nil
))))
234 (if (equal "" real-fname
)
235 (setq real-fname
"/"))
236 (setq no-cache
(and no-cache
(string-match "no-cache" no-cache
)))
238 (setq auth
(concat "Authorization: " auth
"\r\n")))
240 (setq proxy-auth
(concat "Proxy-Authorization: " proxy-auth
"\r\n")))
242 ;; Protection against stupid values in the referrer
243 (if (and ref-url
(stringp ref-url
) (or (string= ref-url
"file:nil")
244 (string= ref-url
"")))
247 ;; We do not want to expose the referrer if the user is paranoid.
248 (if (or (memq url-privacy-level
'(low high paranoid
))
249 (and (listp url-privacy-level
)
250 (memq 'lastloc url-privacy-level
)))
253 ;; url-http-extra-headers contains an assoc-list of
254 ;; header/value pairs that we need to put into the request.
255 (setq extra-headers
(mapconcat
257 (concat (car x
) ": " (cdr x
)))
258 url-http-extra-headers
"\r\n"))
259 (if (not (equal extra-headers
""))
260 (setq extra-headers
(concat extra-headers
"\r\n")))
262 ;; This was done with a call to `format'. Concatenating parts has
263 ;; the advantage of keeping the parts of each header together and
264 ;; allows us to elide null lines directly, at the cost of making
265 ;; the layout less clear.
267 ;; We used to concat directly, but if one of the strings happens
268 ;; to being multibyte (even if it only contains pure ASCII) then
269 ;; every string gets converted with `string-MAKE-multibyte' which
270 ;; turns the 127-255 codes into things like latin-1 accented chars
271 ;; (it would work right if it used `string-TO-multibyte' instead).
272 ;; So to avoid the problem we force every string to be unibyte.
274 ;; FIXME: Instead of `string-AS-unibyte' we'd want
275 ;; `string-to-unibyte', so as to properly signal an error if one
276 ;; of the strings contains a multibyte char.
281 (or url-http-method
"GET") " "
282 (if using-proxy
(url-recreate-url url-http-target-url
) real-fname
)
283 " HTTP/" url-http-version
"\r\n"
284 ;; Version of MIME we speak
285 "MIME-Version: 1.0\r\n"
286 ;; (maybe) Try to keep the connection open
287 "Connection: " (if (or using-proxy
288 (not url-http-attempt-keepalives
))
289 "close" "keep-alive") "\r\n"
290 ;; HTTP extensions we support
291 (if url-extensions-header
293 "Extension: %s\r\n" url-extensions-header
))
294 ;; Who we want to talk to
295 (if (/= (url-port url-http-target-url
)
296 (url-scheme-get-property
297 (url-type url-http-target-url
) 'default-port
))
299 "Host: %s:%d\r\n" host
(url-port url-http-target-url
))
300 (format "Host: %s\r\n" host
))
302 (if url-personal-mail-address
304 "From: " url-personal-mail-address
"\r\n"))
305 ;; Encodings we understand
306 (if url-mime-encoding-string
308 "Accept-encoding: " url-mime-encoding-string
"\r\n"))
309 (if url-mime-charset-string
311 "Accept-charset: " url-mime-charset-string
"\r\n"))
312 ;; Languages we understand
313 (if url-mime-language-string
315 "Accept-language: " url-mime-language-string
"\r\n"))
316 ;; Types we understand
317 "Accept: " (or url-mime-accept-string
"*/*") "\r\n"
319 (url-http-user-agent-string)
320 ;; Proxy Authorization
325 (when (url-use-cookies url-http-target-url
)
326 (url-cookie-generate-header-lines
328 (equal "https" (url-type url-http-target-url
))))
330 (if (and (not no-cache
)
331 (member url-http-method
'("GET" nil
)))
332 (let ((tm (url-is-cached url-http-target-url
)))
334 (concat "If-modified-since: "
335 (url-get-normalized-date tm
) "\r\n"))))
338 "Referer: " ref-url
"\r\n"))
343 "Content-length: " (number-to-string
344 (length url-http-data
))
350 ;; If `url-http-data' is nil, avoid two CRLFs (Bug#8931).
351 (if url-http-data
"\r\n")))
353 (url-http-debug "Request is: \n%s" request
)
357 (defun url-http-clean-headers ()
358 "Remove trailing \r from header lines.
359 This allows us to use `mail-fetch-field', etc.
360 Return the number of characters removed."
361 (declare (special url-http-end-of-headers
))
362 (let ((end (marker-position url-http-end-of-headers
)))
363 (goto-char (point-min))
364 (while (re-search-forward "\r$" url-http-end-of-headers t
)
366 (- end url-http-end-of-headers
)))
368 (defun url-http-handle-authentication (proxy)
369 (declare (special status success url-http-method url-http-data
370 url-callback-function url-callback-arguments
))
371 (url-http-debug "Handling %s authentication" (if proxy
"proxy" "normal"))
372 (let ((auths (or (nreverse
374 (if proxy
"proxy-authenticate" "www-authenticate")
378 (url (url-recreate-url url-current-object
))
379 (auth-url (url-recreate-url
380 (if (and proxy
(boundp 'url-http-proxy
))
382 url-current-object
)))
383 (url-basic-auth-storage (if proxy
384 ;; Cheating, but who cares? :)
385 'url-http-proxy-basic-auth-storage
386 'url-http-real-basic-auth-storage
))
390 ;; find strongest supported auth
391 (dolist (this-auth auths
)
392 (setq this-auth
(url-eat-trailing-space
393 (url-strip-leading-spaces
396 (if (string-match "[ \t]" this-auth
)
397 (downcase (substring this-auth
0 (match-beginning 0)))
398 (downcase this-auth
)))
399 (registered (url-auth-registered this-type
))
400 (this-strength (cddr registered
)))
401 (when (and registered
(> this-strength strength
))
404 strength this-strength
))))
406 (if (not (url-auth-registered type
))
409 (goto-char (point-max))
410 (insert "<hr>Sorry, but I do not know how to handle " type
411 " authentication. If you'd like to write it,"
412 " send it to " url-bug-address
".<hr>")
414 (let* ((args (url-parse-args (subst-char-in-string ?
, ?\
; auth)))
415 (auth (url-get-authentication auth-url
416 (cdr-safe (assoc "realm" args
))
420 (push (cons (if proxy
"Proxy-Authorization" "Authorization") auth
)
421 url-http-extra-headers
)
422 (let ((url-request-method url-http-method
)
423 (url-request-data url-http-data
)
424 (url-request-extra-headers url-http-extra-headers
))
425 (url-retrieve-internal url url-callback-function
426 url-callback-arguments
)))))))
428 (defun url-http-parse-response ()
429 "Parse just the response code."
430 (declare (special url-http-end-of-headers url-http-response-status
431 url-http-response-version
))
432 (if (not url-http-end-of-headers
)
433 (error "Trying to parse HTTP response code in odd buffer: %s" (buffer-name)))
434 (url-http-debug "url-http-parse-response called in (%s)" (buffer-name))
435 (goto-char (point-min))
436 (skip-chars-forward " \t\n") ; Skip any blank crap
437 (skip-chars-forward "HTTP/") ; Skip HTTP Version
438 (setq url-http-response-version
439 (buffer-substring (point)
441 (skip-chars-forward "[0-9].")
443 (setq url-http-response-status
(read (current-buffer))))
445 (defun url-http-handle-cookies ()
446 "Handle all set-cookie / set-cookie2 headers in an HTTP response.
447 The buffer must already be narrowed to the headers, so `mail-fetch-field' will
449 (let ((cookies (nreverse (mail-fetch-field "Set-Cookie" nil nil t
)))
450 (cookies2 (nreverse (mail-fetch-field "Set-Cookie2" nil nil t
))))
451 (and cookies
(url-http-debug "Found %d Set-Cookie headers" (length cookies
)))
452 (and cookies2
(url-http-debug "Found %d Set-Cookie2 headers" (length cookies2
)))
454 (url-cookie-handle-set-cookie (pop cookies
)))
456 ;;; (url-cookie-handle-set-cookie2 (pop cookies)))
460 (defun url-http-parse-headers ()
461 "Parse and handle HTTP specific headers.
462 Return t if and only if the current buffer is still active and
463 should be shown to the user."
464 ;; The comments after each status code handled are taken from RFC
466 (declare (special url-http-end-of-headers url-http-response-status
467 url-http-response-version
468 url-http-method url-http-data url-http-process
469 url-callback-function url-callback-arguments
))
471 (url-http-mark-connection-as-free (url-host url-current-object
)
472 (url-port url-current-object
)
475 (if (or (not (boundp 'url-http-end-of-headers
))
476 (not url-http-end-of-headers
))
477 (error "Trying to parse headers in odd buffer: %s" (buffer-name)))
478 (goto-char (point-min))
479 (url-http-debug "url-http-parse-headers called in (%s)" (buffer-name))
480 (url-http-parse-response)
481 (mail-narrow-to-head)
482 ;;(narrow-to-region (point-min) url-http-end-of-headers)
483 (let ((connection (mail-fetch-field "Connection")))
484 ;; In HTTP 1.0, keep the connection only if there is a
485 ;; "Connection: keep-alive" header.
486 ;; In HTTP 1.1 (and greater), keep the connection unless there is a
487 ;; "Connection: close" header
489 ((string= url-http-response-version
"1.0")
490 (unless (and connection
491 (string= (downcase connection
) "keep-alive"))
492 (delete-process url-http-process
)))
494 (when (and connection
495 (string= (downcase connection
) "close"))
496 (delete-process url-http-process
)))))
497 (let ((buffer (current-buffer))
500 ;; other status symbols: jewelry and luxury cars
501 (status-symbol (cadr (assq url-http-response-status url-http-codes
)))
502 ;; The filename part of a URL could be in remote file syntax,
503 ;; see Bug#6717 for an example. We disable file name
504 ;; handlers, therefore.
505 (file-name-handler-alist nil
))
506 (setq class
(/ url-http-response-status
100))
507 (url-http-debug "Parsed HTTP headers: class=%d status=%d" class url-http-response-status
)
508 (when (url-use-cookies url-http-target-url
)
509 (url-http-handle-cookies))
512 ;; Classes of response codes
514 ;; 5xx = Server Error
515 ;; 4xx = Client Error
518 ;; 1xx = Informational
519 (1 ; Information messages
520 ;; 100 = Continue with request
521 ;; 101 = Switching protocols
522 ;; 102 = Processing (Added by DAV)
523 (url-mark-buffer-as-dead buffer
)
524 (error "HTTP responses in class 1xx not supported (%d)" url-http-response-status
))
529 ;; 203 Non-authoritative information
532 ;; 206 Partial content
533 ;; 207 Multi-status (Added by DAV)
535 ((no-content reset-content
)
536 ;; No new data, just stay at the same document
537 (url-mark-buffer-as-dead buffer
)
540 ;; Generic success for all others. Store in the cache, and
541 ;; mark it as successful.
543 (if (and url-automatic-caching
(equal url-http-method
"GET"))
544 (url-store-in-cache buffer
))
547 ;; 300 Multiple choices
548 ;; 301 Moved permanently
553 ;; 307 Temporary redirect
554 (let ((redirect-uri (or (mail-fetch-field "Location")
555 (mail-fetch-field "URI"))))
557 (multiple-choices ; 300
558 ;; Quoth the spec (section 10.3.1)
559 ;; -------------------------------
560 ;; The requested resource corresponds to any one of a set of
561 ;; representations, each with its own specific location and
562 ;; agent-driven negotiation information is being provided so
563 ;; that the user can select a preferred representation and
564 ;; redirect its request to that location.
566 ;; If the server has a preferred choice of representation, it
567 ;; SHOULD include the specific URI for that representation in
568 ;; the Location field; user agents MAY use the Location field
569 ;; value for automatic redirection.
570 ;; -------------------------------
571 ;; We do not support agent-driven negotiation, so we just
572 ;; redirect to the preferred URI if one is provided.
574 ((moved-permanently found temporary-redirect
) ; 301 302 307
575 ;; If the 301|302 status code is received in response to a
576 ;; request other than GET or HEAD, the user agent MUST NOT
577 ;; automatically redirect the request unless it can be
578 ;; confirmed by the user, since this might change the
579 ;; conditions under which the request was issued.
580 (unless (member url-http-method
'("HEAD" "GET"))
581 (setq redirect-uri nil
)))
583 ;; The response to the request can be found under a different
584 ;; URI and SHOULD be retrieved using a GET method on that
586 (setq url-http-method
"GET"
589 ;; The 304 response MUST NOT contain a message-body.
590 (url-http-debug "Extracting document from cache... (%s)"
591 (url-cache-create-filename (url-view-url t
)))
592 (url-cache-extract (url-cache-create-filename (url-view-url t
)))
593 (setq redirect-uri nil
596 ;; The requested resource MUST be accessed through the
597 ;; proxy given by the Location field. The Location field
598 ;; gives the URI of the proxy. The recipient is expected
599 ;; to repeat this single request via the proxy. 305
600 ;; responses MUST only be generated by origin servers.
601 (error "Redirection thru a proxy server not supported: %s"
604 ;; Treat everything like '300'
607 ;; Clean off any whitespace and/or <...> cruft.
608 (if (string-match "\\([^ \t]+\\)[ \t]" redirect-uri
)
609 (setq redirect-uri
(match-string 1 redirect-uri
)))
610 (if (string-match "^<\\(.*\\)>$" redirect-uri
)
611 (setq redirect-uri
(match-string 1 redirect-uri
)))
613 ;; Some stupid sites (like sourceforge) send a
614 ;; non-fully-qualified URL (ie: /), which royally confuses
616 (if (not (string-match url-nonrelative-link redirect-uri
))
617 ;; Be careful to use the real target URL, otherwise we may
618 ;; compute the redirection relative to the URL of the proxy.
620 (url-expand-file-name redirect-uri url-http-target-url
)))
621 (let ((url-request-method url-http-method
)
622 (url-request-data url-http-data
)
623 (url-request-extra-headers url-http-extra-headers
))
624 ;; Check existing number of redirects
625 (if (or (< url-max-redirections
0)
626 (and (> url-max-redirections
0)
627 (let ((events (car url-callback-arguments
))
630 (if (eq (car events
) :redirect
)
631 (setq old-redirects
(1+ old-redirects
)))
632 (and (setq events
(cdr events
))
633 (setq events
(cdr events
))))
634 (< old-redirects url-max-redirections
))))
635 ;; url-max-redirections hasn't been reached, so go
636 ;; ahead and redirect.
638 ;; Remember that the request was redirected.
639 (setf (car url-callback-arguments
)
640 (nconc (list :redirect redirect-uri
)
641 (car url-callback-arguments
)))
642 ;; Put in the current buffer a forwarding pointer to the new
643 ;; destination buffer.
644 ;; FIXME: This is a hack to fix url-retrieve-synchronously
645 ;; without changing the API. Instead url-retrieve should
646 ;; either simply not return the "destination" buffer, or it
647 ;; should take an optional `dest-buf' argument.
648 (set (make-local-variable 'url-redirect-buffer
)
649 (url-retrieve-internal
650 redirect-uri url-callback-function
651 url-callback-arguments
652 (url-silent url-current-object
)
653 (not (url-use-cookies url-current-object
))))
654 (url-mark-buffer-as-dead buffer
))
655 ;; We hit url-max-redirections, so issue an error and
657 (url-http-debug "Maximum redirections reached")
658 (setf (car url-callback-arguments
)
659 (nconc (list :error
(list 'error
'http-redirect-limit
661 (car url-callback-arguments
)))
662 (setq success t
))))))
666 ;; 402 Payment required
669 ;; 405 Method not allowed
670 ;; 406 Not acceptable
671 ;; 407 Proxy authentication required
672 ;; 408 Request time-out
675 ;; 411 Length required
676 ;; 412 Precondition failed
677 ;; 413 Request entity too large
678 ;; 414 Request-URI too large
679 ;; 415 Unsupported media type
680 ;; 416 Requested range not satisfiable
681 ;; 417 Expectation failed
682 ;; 422 Unprocessable Entity (Added by DAV)
684 ;; 424 Failed Dependency
687 ;; The request requires user authentication. The response
688 ;; MUST include a WWW-Authenticate header field containing a
689 ;; challenge applicable to the requested resource. The
690 ;; client MAY repeat the request with a suitable
691 ;; Authorization header field.
692 (url-http-handle-authentication nil
))
693 (payment-required ; 402
694 ;; This code is reserved for future use
695 (url-mark-buffer-as-dead buffer
)
696 (error "Somebody wants you to give them money"))
698 ;; The server understood the request, but is refusing to
699 ;; fulfill it. Authorization will not help and the request
700 ;; SHOULD NOT be repeated.
705 (method-not-allowed ; 405
706 ;; The method specified in the Request-Line is not allowed
707 ;; for the resource identified by the Request-URI. The
708 ;; response MUST include an Allow header containing a list of
709 ;; valid methods for the requested resource.
711 (not-acceptable ; 406
712 ;; The resource identified by the request is only capable of
713 ;; generating response entities which have content
714 ;; characteristics not acceptable according to the accept
715 ;; headers sent in the request.
717 (proxy-authentication-required ; 407
718 ;; This code is similar to 401 (Unauthorized), but indicates
719 ;; that the client must first authenticate itself with the
720 ;; proxy. The proxy MUST return a Proxy-Authenticate header
721 ;; field containing a challenge applicable to the proxy for
722 ;; the requested resource.
723 (url-http-handle-authentication t
))
724 (request-timeout ; 408
725 ;; The client did not produce a request within the time that
726 ;; the server was prepared to wait. The client MAY repeat
727 ;; the request without modifications at any later time.
730 ;; The request could not be completed due to a conflict with
731 ;; the current state of the resource. This code is only
732 ;; allowed in situations where it is expected that the user
733 ;; might be able to resolve the conflict and resubmit the
734 ;; request. The response body SHOULD include enough
735 ;; information for the user to recognize the source of the
739 ;; The requested resource is no longer available at the
740 ;; server and no forwarding address is known.
742 (length-required ; 411
743 ;; The server refuses to accept the request without a defined
744 ;; Content-Length. The client MAY repeat the request if it
745 ;; adds a valid Content-Length header field containing the
746 ;; length of the message-body in the request message.
748 ;; NOTE - this will never happen because
749 ;; `url-http-create-request' automatically calculates the
752 (precondition-failed ; 412
753 ;; The precondition given in one or more of the
754 ;; request-header fields evaluated to false when it was
755 ;; tested on the server.
757 ((request-entity-too-large request-uri-too-large
) ; 413 414
758 ;; The server is refusing to process a request because the
759 ;; request entity|URI is larger than the server is willing or
762 (unsupported-media-type ; 415
763 ;; The server is refusing to service the request because the
764 ;; entity of the request is in a format not supported by the
765 ;; requested resource for the requested method.
767 (requested-range-not-satisfiable ; 416
768 ;; A server SHOULD return a response with this status code if
769 ;; a request included a Range request-header field, and none
770 ;; of the range-specifier values in this field overlap the
771 ;; current extent of the selected resource, and the request
772 ;; did not include an If-Range request-header field.
774 (expectation-failed ; 417
775 ;; The expectation given in an Expect request-header field
776 ;; could not be met by this server, or, if the server is a
777 ;; proxy, the server has unambiguous evidence that the
778 ;; request could not be met by the next-hop server.
781 ;; The request could not be understood by the server due to
782 ;; malformed syntax. The client SHOULD NOT repeat the
783 ;; request without modifications.
785 ;; Tell the callback that an error occurred, and what the
788 (setf (car url-callback-arguments
)
789 (nconc (list :error
(list 'error
'http url-http-response-status
))
790 (car url-callback-arguments
)))))
792 ;; 500 Internal server error
793 ;; 501 Not implemented
795 ;; 503 Service unavailable
796 ;; 504 Gateway time-out
797 ;; 505 HTTP version not supported
798 ;; 507 Insufficient storage
800 (case url-http-response-status
801 (not-implemented ; 501
802 ;; The server does not support the functionality required to
803 ;; fulfill the request.
806 ;; The server, while acting as a gateway or proxy, received
807 ;; an invalid response from the upstream server it accessed
808 ;; in attempting to fulfill the request.
810 (service-unavailable ; 503
811 ;; The server is currently unable to handle the request due
812 ;; to a temporary overloading or maintenance of the server.
813 ;; The implication is that this is a temporary condition
814 ;; which will be alleviated after some delay. If known, the
815 ;; length of the delay MAY be indicated in a Retry-After
816 ;; header. If no Retry-After is given, the client SHOULD
817 ;; handle the response as it would for a 500 response.
819 (gateway-timeout ; 504
820 ;; The server, while acting as a gateway or proxy, did not
821 ;; receive a timely response from the upstream server
822 ;; specified by the URI (e.g. HTTP, FTP, LDAP) or some other
823 ;; auxiliary server (e.g. DNS) it needed to access in
824 ;; attempting to complete the request.
826 (http-version-not-supported ; 505
827 ;; The server does not support, or refuses to support, the
828 ;; HTTP protocol version that was used in the request
831 (insufficient-storage ; 507 (DAV)
832 ;; The method could not be performed on the resource
833 ;; because the server is unable to store the representation
834 ;; needed to successfully complete the request. This
835 ;; condition is considered to be temporary. If the request
836 ;; which received this status code was the result of a user
837 ;; action, the request MUST NOT be repeated until it is
838 ;; requested by a separate user action.
840 ;; Tell the callback that an error occurred, and what the
843 (setf (car url-callback-arguments
)
844 (nconc (list :error
(list 'error
'http url-http-response-status
))
845 (car url-callback-arguments
)))))
847 (error "Unknown class of HTTP response code: %d (%d)"
848 class url-http-response-status
)))
850 (url-mark-buffer-as-dead buffer
))
851 (url-http-debug "Finished parsing HTTP headers: %S" success
)
856 (defun url-http-activate-callback ()
857 "Activate callback specified when this buffer was created."
858 (declare (special url-http-process
859 url-callback-function
860 url-callback-arguments
))
861 (url-http-mark-connection-as-free (url-host url-current-object
)
862 (url-port url-current-object
)
864 (url-http-debug "Activating callback in buffer (%s)" (buffer-name))
865 (apply url-callback-function url-callback-arguments
))
869 ;; These unfortunately cannot be macros... please ignore them!
870 (defun url-http-idle-sentinel (proc why
)
871 "Remove (now defunct) process PROC from the list of open connections."
872 (maphash (lambda (key val
)
874 (puthash key
(delq proc val
) url-http-open-connections
)))
875 url-http-open-connections
))
877 (defun url-http-end-of-document-sentinel (proc why
)
878 ;; Sentinel used to handle (i) terminated old HTTP/0.9 connections,
879 ;; and (ii) closed connection due to reusing a HTTP connection which
880 ;; we believed was still alive, but which the server closed on us.
881 ;; We handle case (ii) by calling `url-http' again.
882 (url-http-debug "url-http-end-of-document-sentinel in buffer (%s)"
883 (process-buffer proc
))
884 (url-http-idle-sentinel proc why
)
885 (when (buffer-name (process-buffer proc
))
886 (with-current-buffer (process-buffer proc
)
887 (goto-char (point-min))
888 (cond ((not (looking-at "HTTP/"))
889 (if url-http-no-retry
890 ;; HTTP/0.9 just gets passed back no matter what
891 (url-http-activate-callback)
892 ;; Call `url-http' again if our connection expired.
894 (url-http url-current-object url-callback-function
895 url-callback-arguments
(current-buffer))))
896 ((url-http-parse-headers)
897 (url-http-activate-callback))))))
899 (defun url-http-simple-after-change-function (st nd length
)
900 ;; Function used when we do NOT know how long the document is going to be
901 ;; Just _very_ simple 'downloaded %d' type of info.
902 (declare (special url-http-end-of-headers
))
903 (url-lazy-message "Reading %s..." (url-pretty-length nd
)))
905 (defun url-http-content-length-after-change-function (st nd length
)
906 "Function used when we DO know how long the document is going to be.
907 More sophisticated percentage downloaded, etc.
908 Also does minimal parsing of HTTP headers and will actually cause
909 the callback to be triggered."
910 (declare (special url-current-object
911 url-http-end-of-headers
912 url-http-content-length
913 url-http-content-type
915 (if url-http-content-type
916 (url-display-percentage
917 "Reading [%s]... %s of %s (%d%%)"
918 (url-percentage (- nd url-http-end-of-headers
)
919 url-http-content-length
)
920 url-http-content-type
921 (url-pretty-length (- nd url-http-end-of-headers
))
922 (url-pretty-length url-http-content-length
)
923 (url-percentage (- nd url-http-end-of-headers
)
924 url-http-content-length
))
925 (url-display-percentage
926 "Reading... %s of %s (%d%%)"
927 (url-percentage (- nd url-http-end-of-headers
)
928 url-http-content-length
)
929 (url-pretty-length (- nd url-http-end-of-headers
))
930 (url-pretty-length url-http-content-length
)
931 (url-percentage (- nd url-http-end-of-headers
)
932 url-http-content-length
)))
934 (if (> (- nd url-http-end-of-headers
) url-http-content-length
)
936 ;; Found the end of the document! Wheee!
937 (url-display-percentage nil nil
)
938 (url-lazy-message "Reading... done.")
939 (if (url-http-parse-headers)
940 (url-http-activate-callback)))))
942 (defun url-http-chunked-encoding-after-change-function (st nd length
)
943 "Function used when dealing with 'chunked' encoding.
944 Cannot give a sophisticated percentage, but we need a different
945 function to look for the special 0-length chunk that signifies
946 the end of the document."
947 (declare (special url-current-object
948 url-http-end-of-headers
949 url-http-content-type
950 url-http-chunked-length
951 url-http-chunked-counter
952 url-http-process url-http-chunked-start
))
955 (let ((read-next-chunk t
)
958 (no-initial-crlf nil
))
959 ;; We need to loop thru looking for more chunks even within
960 ;; one after-change-function call.
961 (while read-next-chunk
962 (setq no-initial-crlf
(= 0 url-http-chunked-counter
))
963 (if url-http-content-type
964 (url-display-percentage nil
965 "Reading [%s]... chunk #%d"
966 url-http-content-type url-http-chunked-counter
)
967 (url-display-percentage nil
968 "Reading... chunk #%d"
969 url-http-chunked-counter
))
970 (url-http-debug "Reading chunk %d (%d %d %d)"
971 url-http-chunked-counter st nd length
)
972 (setq regexp
(if no-initial-crlf
973 "\\([0-9a-z]+\\).*\r?\n"
974 "\r?\n\\([0-9a-z]+\\).*\r?\n"))
976 (if url-http-chunked-start
977 ;; We know how long the chunk is supposed to be, skip over
978 ;; leading crap if possible.
979 (if (> nd
(+ url-http-chunked-start url-http-chunked-length
))
981 (url-http-debug "Got to the end of chunk #%d!"
982 url-http-chunked-counter
)
983 (goto-char (+ url-http-chunked-start
984 url-http-chunked-length
)))
985 (url-http-debug "Still need %d bytes to hit end of chunk"
986 (- (+ url-http-chunked-start
987 url-http-chunked-length
)
989 (setq read-next-chunk nil
)))
990 (if (not read-next-chunk
)
991 (url-http-debug "Still spinning for next chunk...")
992 (if no-initial-crlf
(skip-chars-forward "\r\n"))
993 (if (not (looking-at regexp
))
995 ;; Must not have received the entirety of the chunk header,
996 ;; need to spin some more.
997 (url-http-debug "Did not see start of chunk @ %d!" (point))
998 (setq read-next-chunk nil
))
999 (add-text-properties (match-beginning 0) (match-end 0)
1005 (setq url-http-chunked-length
(string-to-number (buffer-substring
1009 url-http-chunked-counter
(1+ url-http-chunked-counter
)
1010 url-http-chunked-start
(set-marker
1011 (or url-http-chunked-start
1014 ; (if (not url-http-debug)
1015 (delete-region (match-beginning 0) (match-end 0));)
1016 (url-http-debug "Saw start of chunk %d (length=%d, start=%d"
1017 url-http-chunked-counter url-http-chunked-length
1018 (marker-position url-http-chunked-start
))
1019 (if (= 0 url-http-chunked-length
)
1021 ;; Found the end of the document! Wheee!
1022 (url-http-debug "Saw end of stream chunk!")
1023 (setq read-next-chunk nil
)
1024 (url-display-percentage nil nil
)
1025 ;; Every chunk, even the last 0-length one, is
1026 ;; terminated by CRLF. Skip it.
1027 (when (looking-at "\r?\n")
1028 (url-http-debug "Removing terminator of last chunk")
1029 (delete-region (match-beginning 0) (match-end 0)))
1030 (if (re-search-forward "^\r*$" nil t
)
1031 (url-http-debug "Saw end of trailers..."))
1032 (if (url-http-parse-headers)
1033 (url-http-activate-callback))))))))))
1035 (defun url-http-wait-for-headers-change-function (st nd length
)
1036 ;; This will wait for the headers to arrive and then splice in the
1037 ;; next appropriate after-change-function, etc.
1038 (declare (special url-current-object
1039 url-http-end-of-headers
1040 url-http-content-type
1041 url-http-content-length
1042 url-http-transfer-encoding
1043 url-callback-function
1044 url-callback-arguments
1047 url-http-after-change-function
1048 url-http-response-status
))
1049 (url-http-debug "url-http-wait-for-headers-change-function (%s)"
1051 (let ((end-of-headers nil
)
1053 (process-buffer (current-buffer))
1054 (content-length nil
))
1056 (goto-char (point-min))
1057 (if (and (looking-at ".*\n") ; have one line at least
1058 (not (looking-at "^HTTP/[1-9]\\.[0-9]")))
1059 ;; Not HTTP/x.y data, must be 0.9
1060 ;; God, I wish this could die.
1061 (setq end-of-headers t
1062 url-http-end-of-headers
0
1064 (when (re-search-forward "^\r*$" nil t
)
1065 ;; Saw the end of the headers
1066 (url-http-debug "Saw end of headers... (%s)" (buffer-name))
1067 (setq url-http-end-of-headers
(set-marker (make-marker)
1070 (setq nd
(- nd
(url-http-clean-headers)))))
1072 (if (not end-of-headers
)
1073 ;; Haven't seen the end of the headers yet, need to wait
1074 ;; for more data to arrive.
1077 (url-http-parse-response)
1078 (mail-narrow-to-head)
1079 (setq url-http-transfer-encoding
(mail-fetch-field
1080 "transfer-encoding")
1081 url-http-content-type
(mail-fetch-field "content-type"))
1082 (if (mail-fetch-field "content-length")
1083 (setq url-http-content-length
1084 (string-to-number (mail-fetch-field "content-length"))))
1086 (when url-http-transfer-encoding
1087 (setq url-http-transfer-encoding
1088 (downcase url-http-transfer-encoding
)))
1091 ((null url-http-response-status
)
1092 ;; We got back a headerless malformed response from the
1094 (url-http-activate-callback))
1095 ((or (= url-http-response-status
204)
1096 (= url-http-response-status
205))
1097 (url-http-debug "%d response must have headers only (%s)."
1098 url-http-response-status
(buffer-name))
1099 (when (url-http-parse-headers)
1100 (url-http-activate-callback)))
1101 ((string= "HEAD" url-http-method
)
1102 ;; A HEAD request is _ALWAYS_ terminated by the header
1103 ;; information, regardless of any entity headers,
1104 ;; according to section 4.4 of the HTTP/1.1 draft.
1105 (url-http-debug "HEAD request must have headers only (%s)."
1107 (when (url-http-parse-headers)
1108 (url-http-activate-callback)))
1109 ((string= "CONNECT" url-http-method
)
1110 ;; A CONNECT request is finished, but we cannot stick this
1111 ;; back on the free connection list
1112 (url-http-debug "CONNECT request must have headers only.")
1113 (when (url-http-parse-headers)
1114 (url-http-activate-callback)))
1115 ((equal url-http-response-status
304)
1116 ;; Only allowed to have a header section. We have to handle
1117 ;; this here instead of in url-http-parse-headers because if
1118 ;; you have a cached copy of something without a known
1119 ;; content-length, and try to retrieve it from the cache, we'd
1120 ;; fall into the 'being dumb' section and wait for the
1121 ;; connection to terminate, which means we'd wait for 10
1122 ;; seconds for the keep-alives to time out on some servers.
1123 (when (url-http-parse-headers)
1124 (url-http-activate-callback)))
1126 ;; HTTP/0.9 always signaled end-of-connection by closing the
1129 "Saw HTTP/0.9 response, connection closed means end of document.")
1130 (setq url-http-after-change-function
1131 'url-http-simple-after-change-function
))
1132 ((equal url-http-transfer-encoding
"chunked")
1133 (url-http-debug "Saw chunked encoding.")
1134 (setq url-http-after-change-function
1135 'url-http-chunked-encoding-after-change-function
)
1136 (when (> nd url-http-end-of-headers
)
1138 "Calling initial chunked-encoding for extra data at end of headers")
1139 (url-http-chunked-encoding-after-change-function
1140 (marker-position url-http-end-of-headers
) nd
1141 (- nd url-http-end-of-headers
))))
1142 ((integerp url-http-content-length
)
1144 "Got a content-length, being smart about document end.")
1145 (setq url-http-after-change-function
1146 'url-http-content-length-after-change-function
)
1148 ((= 0 url-http-content-length
)
1149 ;; We got a NULL body! Activate the callback
1152 "Got 0-length content-length, activating callback immediately.")
1153 (when (url-http-parse-headers)
1154 (url-http-activate-callback)))
1155 ((> nd url-http-end-of-headers
)
1156 ;; Have some leftover data
1157 (url-http-debug "Calling initial content-length for extra data at end of headers")
1158 (url-http-content-length-after-change-function
1159 (marker-position url-http-end-of-headers
)
1161 (- nd url-http-end-of-headers
)))
1165 (url-http-debug "No content-length, being dumb.")
1166 (setq url-http-after-change-function
1167 'url-http-simple-after-change-function
)))))
1168 ;; We are still at the beginning of the buffer... must just be
1169 ;; waiting for a response.
1170 (url-http-debug "Spinning waiting for headers...")
1171 (when (eq process-buffer
(current-buffer))
1172 (goto-char (point-max)))))
1175 (defun url-http (url callback cbargs
&optional retry-buffer
)
1176 "Retrieve URL via HTTP asynchronously.
1177 URL must be a parsed URL. See `url-generic-parse-url' for details.
1178 When retrieval is completed, the function CALLBACK is executed with
1179 CBARGS as the arguments.
1181 Optional arg RETRY-BUFFER, if non-nil, specifies the buffer of a
1182 previous `url-http' call, which is being re-attempted."
1183 (check-type url vector
"Need a pre-parsed URL.")
1184 (declare (special url-current-object
1185 url-http-end-of-headers
1186 url-http-content-type
1187 url-http-content-length
1188 url-http-transfer-encoding
1189 url-http-after-change-function
1190 url-callback-function
1191 url-callback-arguments
1194 url-http-extra-headers
1196 url-http-chunked-length
1197 url-http-chunked-start
1198 url-http-chunked-counter
1200 (let* ((host (url-host (or url-using-proxy url
)))
1201 (port (url-port (or url-using-proxy url
)))
1202 (connection (url-http-find-free-connection host port
))
1203 (buffer (or retry-buffer
1204 (generate-new-buffer (format " *http %s:%d*" host port
)))))
1205 (if (not connection
)
1206 ;; Failed to open the connection for some reason
1208 (kill-buffer buffer
)
1210 (error "Could not create connection to %s:%d" host port
))
1211 (with-current-buffer buffer
1212 (mm-disable-multibyte)
1213 (setq url-current-object url
1214 mode-line-format
"%b [%s]")
1216 (dolist (var '(url-http-end-of-headers
1217 url-http-content-type
1218 url-http-content-length
1219 url-http-transfer-encoding
1220 url-http-after-change-function
1221 url-http-response-version
1222 url-http-response-status
1223 url-http-chunked-length
1224 url-http-chunked-counter
1225 url-http-chunked-start
1226 url-callback-function
1227 url-callback-arguments
1231 url-http-extra-headers
1235 url-http-connection-opened
1237 (set (make-local-variable var
) nil
))
1239 (setq url-http-method
(or url-request-method
"GET")
1240 url-http-extra-headers url-request-extra-headers
1241 url-http-data url-request-data
1242 url-http-process connection
1243 url-http-chunked-length nil
1244 url-http-chunked-start nil
1245 url-http-chunked-counter
0
1246 url-callback-function callback
1247 url-callback-arguments cbargs
1248 url-http-after-change-function
'url-http-wait-for-headers-change-function
1249 url-http-target-url url-current-object
1250 url-http-no-retry retry-buffer
1251 url-http-connection-opened nil
1252 url-http-proxy url-using-proxy
)
1254 (set-process-buffer connection buffer
)
1255 (set-process-filter connection
'url-http-generic-filter
)
1256 (let ((status (process-status connection
)))
1258 ((eq status
'connect
)
1259 ;; Asynchronous connection
1260 (set-process-sentinel connection
'url-http-async-sentinel
))
1261 ((eq status
'failed
)
1262 ;; Asynchronous connection failed
1263 (error "Could not create connection to %s:%d" host port
))
1265 (set-process-sentinel connection
'url-http-end-of-document-sentinel
)
1266 (process-send-string connection
(url-http-create-request)))))))
1269 (defun url-http-async-sentinel (proc why
)
1270 (declare (special url-callback-arguments
))
1271 ;; We are performing an asynchronous connection, and a status change
1273 (when (buffer-name (process-buffer proc
))
1274 (with-current-buffer (process-buffer proc
)
1276 (url-http-connection-opened
1277 (setq url-http-no-retry t
)
1278 (url-http-end-of-document-sentinel proc why
))
1279 ((string= (substring why
0 4) "open")
1280 (setq url-http-connection-opened t
)
1281 (condition-case error
1282 (process-send-string proc
(url-http-create-request))
1284 (setq url-http-connection-opened nil
)
1285 (message "HTTP error: %s" error
))))
1287 (setf (car url-callback-arguments
)
1288 (nconc (list :error
(list 'error
'connection-failed why
1289 :host
(url-host (or url-http-proxy url-current-object
))
1290 :service
(url-port (or url-http-proxy url-current-object
))))
1291 (car url-callback-arguments
)))
1292 (url-http-activate-callback))))))
1294 ;; Since Emacs 19/20 does not allow you to change the
1295 ;; `after-change-functions' hook in the midst of running them, we fake
1296 ;; an after change by hooking into the process filter and inserting
1297 ;; the data ourselves. This is slightly less efficient, but there
1298 ;; were tons of weird ways the after-change code was biting us in the
1300 ;; FIXME this can probably be simplified since the above is no longer true.
1301 (defun url-http-generic-filter (proc data
)
1302 ;; Sometimes we get a zero-length data chunk after the process has
1303 ;; been changed to 'free', which means it has no buffer associated
1304 ;; with it. Do nothing if there is no buffer, or 0 length data.
1305 (declare (special url-http-after-change-function
))
1306 (and (process-buffer proc
)
1307 (/= (length data
) 0)
1308 (with-current-buffer (process-buffer proc
)
1309 (url-http-debug "Calling after change function `%s' for `%S'" url-http-after-change-function proc
)
1310 (funcall url-http-after-change-function
1313 (goto-char (point-max))
1318 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
1319 ;;; file-name-handler stuff from here on out
1320 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
1321 (defalias 'url-http-symbol-value-in-buffer
1322 (if (fboundp 'symbol-value-in-buffer
)
1323 'symbol-value-in-buffer
1324 (lambda (symbol buffer
&optional unbound-value
)
1325 "Return the value of SYMBOL in BUFFER, or UNBOUND-VALUE if it is unbound."
1326 (with-current-buffer buffer
1327 (if (not (boundp symbol
))
1329 (symbol-value symbol
))))))
1331 (defun url-http-head (url)
1332 (let ((url-request-method "HEAD")
1333 (url-request-data nil
))
1334 (url-retrieve-synchronously url
)))
1337 (defun url-http-file-exists-p (url)
1340 (buffer (url-http-head url
)))
1343 (setq status
(url-http-symbol-value-in-buffer 'url-http-response-status
1345 exists
(and (integerp status
)
1346 (>= status
200) (< status
300)))
1347 (kill-buffer buffer
))
1351 (defalias 'url-http-file-readable-p
'url-http-file-exists-p
)
1353 (defun url-http-head-file-attributes (url &optional id-format
)
1354 (let ((buffer (url-http-head url
)))
1358 nil
;dir / link / normal file
1359 1 ;number of links to file.
1361 nil nil nil
;atime ; mtime ; ctime
1362 (url-http-symbol-value-in-buffer 'url-http-content-length
1364 (eval-when-compile (make-string 10 ?-
))
1365 nil nil nil
) ;whether gid would change ; inode ; device.
1366 (kill-buffer buffer
)))))
1368 (declare-function url-dav-file-attributes
"url-dav" (url &optional id-format
))
1371 (defun url-http-file-attributes (url &optional id-format
)
1372 (if (url-dav-supported-p url
)
1373 (url-dav-file-attributes url id-format
)
1374 (url-http-head-file-attributes url id-format
)))
1377 (defun url-http-options (url)
1378 "Return a property list describing options available for URL.
1379 This list is retrieved using the `OPTIONS' HTTP method.
1381 Property list members:
1384 A list of symbols specifying what HTTP methods the resource
1388 A list of numbers specifying what DAV protocol/schema versions are
1392 A list of supported DASL search types supported (string form)
1395 A list of the units available for use in partial document fetches.
1398 The `Platform For Privacy Protection' description for the resource.
1399 Currently this is just the raw header contents. This is likely to
1400 change once P3P is formally supported by the URL package or
1402 (let* ((url-request-method "OPTIONS")
1403 (url-request-data nil
)
1404 (buffer (url-retrieve-synchronously url
))
1407 (when (and buffer
(= 2 (/ (url-http-symbol-value-in-buffer
1408 'url-http-response-status buffer
0) 100)))
1409 ;; Only parse the options if we got a 2xx response code!
1410 (with-current-buffer buffer
1413 (mail-narrow-to-head)
1415 ;; Figure out what methods are supported.
1416 (when (setq header
(mail-fetch-field "allow"))
1417 (setq options
(plist-put
1419 (mapcar 'intern
(split-string header
"[ ,]+")))))
1422 (when (setq header
(mail-fetch-field "dav"))
1423 (setq options
(plist-put
1426 (mapcar 'string-to-number
1427 (split-string header
"[, ]+"))))))
1430 (when (setq header
(mail-fetch-field "dasl"))
1431 (setq options
(plist-put
1433 (split-string header
"[, ]+"))))
1435 ;; P3P - should get more detailed here. FIXME
1436 (when (setq header
(mail-fetch-field "p3p"))
1437 (setq options
(plist-put options
'p3p header
)))
1439 ;; Check for whether they accept byte-range requests.
1440 (when (setq header
(mail-fetch-field "accept-ranges"))
1441 (setq options
(plist-put
1445 (split-string header
"[, ]+"))))))
1447 (if buffer
(kill-buffer buffer
))
1450 ;; HTTPS. This used to be in url-https.el, but that file collides
1451 ;; with url-http.el on systems with 8-character file names.
1455 (defconst url-https-default-port
443 "Default HTTPS port.")
1457 (defconst url-https-asynchronous-p t
"HTTPS retrievals are asynchronous.")
1459 ;; FIXME what is the point of this alias being an autoload?
1460 ;; Trying to use it will not cause url-http to be loaded,
1461 ;; since the full alias just gets dumped into loaddefs.el.
1463 ;;;###autoload (autoload 'url-default-expander "url-expand")
1465 (defalias 'url-https-expand-file-name
'url-default-expander
)
1467 (defmacro url-https-create-secure-wrapper
(method args
)
1468 `(defun ,(intern (format (if method
"url-https-%s" "url-https") method
)) ,args
1469 ,(format "HTTPS wrapper around `%s' call." (or method
"url-http"))
1470 (let ((url-gateway-method 'tls
))
1471 (,(intern (format (if method
"url-http-%s" "url-http") method
))
1472 ,@(remove '&rest
(remove '&optional args
))))))
1474 ;;;###autoload (autoload 'url-https "url-http")
1475 (url-https-create-secure-wrapper nil
(url callback cbargs
))
1476 ;;;###autoload (autoload 'url-https-file-exists-p "url-http")
1477 (url-https-create-secure-wrapper file-exists-p
(url))
1478 ;;;###autoload (autoload 'url-https-file-readable-p "url-http")
1479 (url-https-create-secure-wrapper file-readable-p
(url))
1480 ;;;###autoload (autoload 'url-https-file-attributes "url-http")
1481 (url-https-create-secure-wrapper file-attributes
(url &optional id-format
))
1485 ;;; url-http.el ends here