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url-http.el
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url-http.el
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;;; url-http.el --- HTTP retrieval routines
;; Copyright (C) 1999, 2001, 2004, 2005, 2006, 2007, 2008,
;; 2009 Free Software Foundation, Inc.
;; Author: Bill Perry <wmperry@gnu.org>
;; Keywords: comm, data, processes
;; 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 <http://www.gnu.org/licenses/>.
;;; Commentary:
;;; Code:
(eval-when-compile (require 'cl))
(defvar url-http-extra-headers)
(defvar url-http-target-url)
(defvar url-http-proxy)
(defvar url-http-connection-opened)
(require 'url-gw)
(require 'url-util)
(require 'url-parse)
(require 'url-cookie)
(require 'mail-parse)
(require 'url-auth)
(require 'url)
(autoload 'url-cache-create-filename "url-cache")
(defconst url-http-default-port 80 "Default HTTP port.")
(defconst url-http-asynchronous-p t "HTTP retrievals are asynchronous.")
(defalias 'url-http-expand-file-name 'url-default-expander)
(defvar url-http-real-basic-auth-storage nil)
(defvar url-http-proxy-basic-auth-storage nil)
(defvar url-http-open-connections (make-hash-table :test 'equal
:size 17)
"A hash table of all open network connections.")
(defvar url-http-version "1.1"
"What version of HTTP we advertise, as a string.
Valid values are 1.1 and 1.0.
This is only useful when debugging the HTTP subsystem.
Setting this to 1.0 will tell servers not to send chunked encoding,
and other HTTP/1.1 specific features.")
(defvar url-http-attempt-keepalives t
"Whether to use a single TCP connection multiple times in HTTP.
This is only useful when debugging the HTTP subsystem. Setting to
nil will explicitly close the connection to the server after every
request.")
;(eval-when-compile
;; These are all macros so that they are hidden from external sight
;; when the file is byte-compiled.
;;
;; This allows us to expose just the entry points we want.
;; These routines will allow us to implement persistent HTTP
;; connections.
(defsubst url-http-debug (&rest args)
(if quit-flag
(let ((proc (get-buffer-process (current-buffer))))
;; The user hit C-g, honor it! Some things can get in an
;; incredibly tight loop (chunked encoding)
(if proc
(progn
(set-process-sentinel proc nil)
(set-process-filter proc nil)))
(error "Transfer interrupted!")))
(apply 'url-debug 'http args))
(defun url-http-mark-connection-as-busy (host port proc)
(url-http-debug "Marking connection as busy: %s:%d %S" host port proc)
(set-process-query-on-exit-flag proc t)
(puthash (cons host port)
(delq proc (gethash (cons host port) url-http-open-connections))
url-http-open-connections)
proc)
(defun url-http-mark-connection-as-free (host port proc)
(url-http-debug "Marking connection as free: %s:%d %S" host port proc)
(when (memq (process-status proc) '(open run connect))
(set-process-buffer proc nil)
(set-process-sentinel proc 'url-http-idle-sentinel)
(set-process-query-on-exit-flag proc nil)
(puthash (cons host port)
(cons proc (gethash (cons host port) url-http-open-connections))
url-http-open-connections))
nil)
(defun url-http-find-free-connection (host port)
(let ((conns (gethash (cons host port) url-http-open-connections))
(found nil))
(while (and conns (not found))
(if (not (memq (process-status (car conns)) '(run open connect)))
(progn
(url-http-debug "Cleaning up dead process: %s:%d %S"
host port (car conns))
(url-http-idle-sentinel (car conns) nil))
(setq found (car conns))
(url-http-debug "Found existing connection: %s:%d %S" host port found))
(pop conns))
(if found
(url-http-debug "Reusing existing connection: %s:%d" host port)
(url-http-debug "Contacting host: %s:%d" host port))
(url-lazy-message "Contacting host: %s:%d" host port)
(url-http-mark-connection-as-busy
host port
(or found
(let ((buf (generate-new-buffer " *url-http-temp*")))
;; `url-open-stream' needs a buffer in which to do things
;; like authentication. But we use another buffer afterwards.
(unwind-protect
(let ((proc (url-open-stream host buf host port)))
;; url-open-stream might return nil.
(when (processp proc)
;; Drop the temp buffer link before killing the buffer.
(set-process-buffer proc nil))
proc)
(kill-buffer buf)))))))
;; Building an HTTP request
(defun url-http-user-agent-string ()
(if (or (eq url-privacy-level 'paranoid)
(and (listp url-privacy-level)
(memq 'agent url-privacy-level)))
""
(format "User-Agent: %sURL/%s%s\r\n"
(if url-package-name
(concat url-package-name "/" url-package-version " ")
"")
url-version
(cond
((and url-os-type url-system-type)
(concat " (" url-os-type "; " url-system-type ")"))
((or url-os-type url-system-type)
(concat " (" (or url-system-type url-os-type) ")"))
(t "")))))
(defun url-http-create-request (&optional ref-url)
"Create an HTTP request for `url-http-target-url', referred to by REF-URL."
(declare (special proxy-info
url-http-method url-http-data
url-http-extra-headers))
(let* ((extra-headers)
(request nil)
(no-cache (cdr-safe (assoc "Pragma" url-http-extra-headers)))
(using-proxy url-http-proxy)
(proxy-auth (if (or (cdr-safe (assoc "Proxy-Authorization"
url-http-extra-headers))
(not using-proxy))
nil
(let ((url-basic-auth-storage
'url-http-proxy-basic-auth-storage))
(url-get-authentication url-http-target-url nil 'any nil))))
(real-fname (concat (url-filename url-http-target-url)
(url-recreate-url-attributes url-http-target-url)))
(host (url-host url-http-target-url))
(auth (if (cdr-safe (assoc "Authorization" url-http-extra-headers))
nil
(url-get-authentication (or
(and (boundp 'proxy-info)
proxy-info)
url-http-target-url) nil 'any nil))))
(if (equal "" real-fname)
(setq real-fname "/"))
(setq no-cache (and no-cache (string-match "no-cache" no-cache)))
(if auth
(setq auth (concat "Authorization: " auth "\r\n")))
(if proxy-auth
(setq proxy-auth (concat "Proxy-Authorization: " proxy-auth "\r\n")))
;; Protection against stupid values in the referer
(if (and ref-url (stringp ref-url) (or (string= ref-url "file:nil")
(string= ref-url "")))
(setq ref-url nil))
;; We do not want to expose the referer if the user is paranoid.
(if (or (memq url-privacy-level '(low high paranoid))
(and (listp url-privacy-level)
(memq 'lastloc url-privacy-level)))
(setq ref-url nil))
;; url-http-extra-headers contains an assoc-list of
;; header/value pairs that we need to put into the request.
(setq extra-headers (mapconcat
(lambda (x)
(concat (car x) ": " (cdr x)))
url-http-extra-headers "\r\n"))
(if (not (equal extra-headers ""))
(setq extra-headers (concat extra-headers "\r\n")))
;; This was done with a call to `format'. Concatting parts has
;; the advantage of keeping the parts of each header together and
;; allows us to elide null lines directly, at the cost of making
;; the layout less clear.
(setq request
;; We used to concat directly, but if one of the strings happens
;; to being multibyte (even if it only contains pure ASCII) then
;; every string gets converted with `string-MAKE-multibyte' which
;; turns the 127-255 codes into things like latin-1 accented chars
;; (it would work right if it used `string-TO-multibyte' instead).
;; So to avoid the problem we force every string to be unibyte.
(mapconcat
;; FIXME: Instead of `string-AS-unibyte' we'd want
;; `string-to-unibyte', so as to properly signal an error if one
;; of the strings contains a multibyte char.
'string-as-unibyte
(delq nil
(list
;; The request
(or url-http-method "GET") " "
(if using-proxy (url-recreate-url url-http-target-url) real-fname)
" HTTP/" url-http-version "\r\n"
;; Version of MIME we speak
"MIME-Version: 1.0\r\n"
;; (maybe) Try to keep the connection open
"Connection: " (if (or using-proxy
(not url-http-attempt-keepalives))
"close" "keep-alive") "\r\n"
;; HTTP extensions we support
(if url-extensions-header
(format
"Extension: %s\r\n" url-extensions-header))
;; Who we want to talk to
(if (/= (url-port url-http-target-url)
(url-scheme-get-property
(url-type url-http-target-url) 'default-port))
(format
"Host: %s:%d\r\n" host (url-port url-http-target-url))
(format "Host: %s\r\n" host))
;; Who its from
(if url-personal-mail-address
(concat
"From: " url-personal-mail-address "\r\n"))
;; Encodings we understand
(if url-mime-encoding-string
(concat
"Accept-encoding: " url-mime-encoding-string "\r\n"))
(if url-mime-charset-string
(concat
"Accept-charset: " url-mime-charset-string "\r\n"))
;; Languages we understand
(if url-mime-language-string
(concat
"Accept-language: " url-mime-language-string "\r\n"))
;; Types we understand
"Accept: " (or url-mime-accept-string "*/*") "\r\n"
;; User agent
(url-http-user-agent-string)
;; Proxy Authorization
proxy-auth
;; Authorization
auth
;; Cookies
(url-cookie-generate-header-lines host real-fname
(equal "https" (url-type url-http-target-url)))
;; If-modified-since
(if (and (not no-cache)
(member url-http-method '("GET" nil)))
(let ((tm (url-is-cached url-http-target-url)))
(if tm
(concat "If-modified-since: "
(url-get-normalized-date tm) "\r\n"))))
;; Whence we came
(if ref-url (concat
"Referer: " ref-url "\r\n"))
extra-headers
;; Length of data
(if url-http-data
(concat
"Content-length: " (number-to-string
(length url-http-data))
"\r\n"))
;; End request
"\r\n"
;; Any data
url-http-data))
""))
(url-http-debug "Request is: \n%s" request)
request))
;; Parsing routines
(defun url-http-clean-headers ()
"Remove trailing \r from header lines.
This allows us to use `mail-fetch-field', etc."
(declare (special url-http-end-of-headers))
(goto-char (point-min))
(while (re-search-forward "\r$" url-http-end-of-headers t)
(replace-match "")))
(defun url-http-handle-authentication (proxy)
(declare (special status success url-http-method url-http-data
url-callback-function url-callback-arguments))
(url-http-debug "Handling %s authentication" (if proxy "proxy" "normal"))
(let ((auths (or (nreverse
(mail-fetch-field
(if proxy "proxy-authenticate" "www-authenticate")
nil nil t))
'("basic")))
(type nil)
(url (url-recreate-url url-current-object))
(auth-url (url-recreate-url
(if (and proxy (boundp 'url-http-proxy))
url-http-proxy
url-current-object)))
(url-basic-auth-storage (if proxy
;; Cheating, but who cares? :)
'url-http-proxy-basic-auth-storage
'url-http-real-basic-auth-storage))
auth
(strength 0))
;; find strongest supported auth
(dolist (this-auth auths)
(setq this-auth (url-eat-trailing-space
(url-strip-leading-spaces
this-auth)))
(let* ((this-type
(if (string-match "[ \t]" this-auth)
(downcase (substring this-auth 0 (match-beginning 0)))
(downcase this-auth)))
(registered (url-auth-registered this-type))
(this-strength (cddr registered)))
(when (and registered (> this-strength strength))
(setq auth this-auth
type this-type
strength this-strength))))
(if (not (url-auth-registered type))
(progn
(widen)
(goto-char (point-max))
(insert "<hr>Sorry, but I do not know how to handle " type
" authentication. If you'd like to write it,"
" send it to " url-bug-address ".<hr>")
(setq status t))
(let* ((args (url-parse-args (subst-char-in-string ?, ?\; auth)))
(auth (url-get-authentication auth-url
(cdr-safe (assoc "realm" args))
type t args)))
(if (not auth)
(setq success t)
(push (cons (if proxy "Proxy-Authorization" "Authorization") auth)
url-http-extra-headers)
(let ((url-request-method url-http-method)
(url-request-data url-http-data)
(url-request-extra-headers url-http-extra-headers))
(url-retrieve-internal url url-callback-function
url-callback-arguments)))))))
(defun url-http-parse-response ()
"Parse just the response code."
(declare (special url-http-end-of-headers url-http-response-status
url-http-response-version))
(if (not url-http-end-of-headers)
(error "Trying to parse HTTP response code in odd buffer: %s" (buffer-name)))
(url-http-debug "url-http-parse-response called in (%s)" (buffer-name))
(goto-char (point-min))
(skip-chars-forward " \t\n") ; Skip any blank crap
(skip-chars-forward "HTTP/") ; Skip HTTP Version
(setq url-http-response-version
(buffer-substring (point)
(progn
(skip-chars-forward "[0-9].")
(point))))
(setq url-http-response-status (read (current-buffer))))
(defun url-http-handle-cookies ()
"Handle all set-cookie / set-cookie2 headers in an HTTP response.
The buffer must already be narrowed to the headers, so `mail-fetch-field' will
work correctly."
(let ((cookies (nreverse (mail-fetch-field "Set-Cookie" nil nil t)))
(cookies2 (nreverse (mail-fetch-field "Set-Cookie2" nil nil t))))
(and cookies (url-http-debug "Found %d Set-Cookie headers" (length cookies)))
(and cookies2 (url-http-debug "Found %d Set-Cookie2 headers" (length cookies2)))
(while cookies
(url-cookie-handle-set-cookie (pop cookies)))
;;; (while cookies2
;;; (url-cookie-handle-set-cookie2 (pop cookies)))
)
)
(defun url-http-parse-headers ()
"Parse and handle HTTP specific headers.
Return t if and only if the current buffer is still active and
should be shown to the user."
;; The comments after each status code handled are taken from RFC
;; 2616 (HTTP/1.1)
(declare (special url-http-end-of-headers url-http-response-status
url-http-response-version
url-http-method url-http-data url-http-process
url-callback-function url-callback-arguments))
(url-http-mark-connection-as-free (url-host url-current-object)
(url-port url-current-object)
url-http-process)
(if (or (not (boundp 'url-http-end-of-headers))
(not url-http-end-of-headers))
(error "Trying to parse headers in odd buffer: %s" (buffer-name)))
(goto-char (point-min))
(url-http-debug "url-http-parse-headers called in (%s)" (buffer-name))
(url-http-parse-response)
(mail-narrow-to-head)
;;(narrow-to-region (point-min) url-http-end-of-headers)
(let ((connection (mail-fetch-field "Connection")))
;; In HTTP 1.0, keep the connection only if there is a
;; "Connection: keep-alive" header.
;; In HTTP 1.1 (and greater), keep the connection unless there is a
;; "Connection: close" header
(cond
((string= url-http-response-version "1.0")
(unless (and connection
(string= (downcase connection) "keep-alive"))
(delete-process url-http-process)))
(t
(when (and connection
(string= (downcase connection) "close"))
(delete-process url-http-process)))))
(let ((buffer (current-buffer))
(class nil)
(success nil))
(setq class (/ url-http-response-status 100))
(url-http-debug "Parsed HTTP headers: class=%d status=%d" class url-http-response-status)
(url-http-handle-cookies)
(case class
;; Classes of response codes
;;
;; 5xx = Server Error
;; 4xx = Client Error
;; 3xx = Redirection
;; 2xx = Successful
;; 1xx = Informational
(1 ; Information messages
;; 100 = Continue with request
;; 101 = Switching protocols
;; 102 = Processing (Added by DAV)
(url-mark-buffer-as-dead buffer)
(error "HTTP responses in class 1xx not supported (%d)" url-http-response-status))
(2 ; Success
;; 200 Ok
;; 201 Created
;; 202 Accepted
;; 203 Non-authoritative information
;; 204 No content
;; 205 Reset content
;; 206 Partial content
;; 207 Multi-status (Added by DAV)
(case url-http-response-status
((204 205)
;; No new data, just stay at the same document
(url-mark-buffer-as-dead buffer)
(setq success t))
(otherwise
;; Generic success for all others. Store in the cache, and
;; mark it as successful.
(widen)
(if (and url-automatic-caching (equal url-http-method "GET"))
(url-store-in-cache buffer))
(setq success t))))
(3 ; Redirection
;; 300 Multiple choices
;; 301 Moved permanently
;; 302 Found
;; 303 See other
;; 304 Not modified
;; 305 Use proxy
;; 307 Temporary redirect
(let ((redirect-uri (or (mail-fetch-field "Location")
(mail-fetch-field "URI"))))
(case url-http-response-status
(300
;; Quoth the spec (section 10.3.1)
;; -------------------------------
;; The requested resource corresponds to any one of a set of
;; representations, each with its own specific location and
;; agent-driven negotiation information is being provided so
;; that the user can select a preferred representation and
;; redirect its request to that location.
;; [...]
;; If the server has a preferred choice of representation, it
;; SHOULD include the specific URI for that representation in
;; the Location field; user agents MAY use the Location field
;; value for automatic redirection.
;; -------------------------------
;; We do not support agent-driven negotiation, so we just
;; redirect to the preferred URI if one is provided.
nil)
((301 302 307)
;; If the 301|302 status code is received in response to a
;; request other than GET or HEAD, the user agent MUST NOT
;; automatically redirect the request unless it can be
;; confirmed by the user, since this might change the
;; conditions under which the request was issued.
(if (member url-http-method '("HEAD" "GET"))
;; Automatic redirection is ok
nil
;; It is just too big of a pain in the ass to get this
;; prompt all the time. We will just silently lose our
;; data and convert to a GET method.
(url-http-debug "Converting `%s' request to `GET' because of REDIRECT(%d)"
url-http-method url-http-response-status)
(setq url-http-method "GET"
url-http-data nil)))
(303
;; The response to the request can be found under a different
;; URI and SHOULD be retrieved using a GET method on that
;; resource.
(setq url-http-method "GET"
url-http-data nil))
(304
;; The 304 response MUST NOT contain a message-body.
(url-http-debug "Extracting document from cache... (%s)"
(url-cache-create-filename (url-view-url t)))
(url-cache-extract (url-cache-create-filename (url-view-url t)))
(setq redirect-uri nil
success t))
(305
;; The requested resource MUST be accessed through the
;; proxy given by the Location field. The Location field
;; gives the URI of the proxy. The recipient is expected
;; to repeat this single request via the proxy. 305
;; responses MUST only be generated by origin servers.
(error "Redirection thru a proxy server not supported: %s"
redirect-uri))
(otherwise
;; Treat everything like '300'
nil))
(when redirect-uri
;; Clean off any whitespace and/or <...> cruft.
(if (string-match "\\([^ \t]+\\)[ \t]" redirect-uri)
(setq redirect-uri (match-string 1 redirect-uri)))
(if (string-match "^<\\(.*\\)>$" redirect-uri)
(setq redirect-uri (match-string 1 redirect-uri)))
;; Some stupid sites (like sourceforge) send a
;; non-fully-qualified URL (ie: /), which royally confuses
;; the URL library.
(if (not (string-match url-nonrelative-link redirect-uri))
;; Be careful to use the real target URL, otherwise we may
;; compute the redirection relative to the URL of the proxy.
(setq redirect-uri
(url-expand-file-name redirect-uri url-http-target-url)))
(let ((url-request-method url-http-method)
(url-request-data url-http-data)
(url-request-extra-headers url-http-extra-headers))
;; Check existing number of redirects
(if (or (< url-max-redirections 0)
(and (> url-max-redirections 0)
(let ((events (car url-callback-arguments))
(old-redirects 0))
(while events
(if (eq (car events) :redirect)
(setq old-redirects (1+ old-redirects)))
(and (setq events (cdr events))
(setq events (cdr events))))
(< old-redirects url-max-redirections))))
;; url-max-redirections hasn't been reached, so go
;; ahead and redirect.
(progn
;; Remember that the request was redirected.
(setf (car url-callback-arguments)
(nconc (list :redirect redirect-uri)
(car url-callback-arguments)))
;; Put in the current buffer a forwarding pointer to the new
;; destination buffer.
;; FIXME: This is a hack to fix url-retrieve-synchronously
;; without changing the API. Instead url-retrieve should
;; either simply not return the "destination" buffer, or it
;; should take an optional `dest-buf' argument.
(set (make-local-variable 'url-redirect-buffer)
(url-retrieve-internal
redirect-uri url-callback-function
url-callback-arguments))
(url-mark-buffer-as-dead buffer))
;; We hit url-max-redirections, so issue an error and
;; stop redirecting.
(url-http-debug "Maximum redirections reached")
(setf (car url-callback-arguments)
(nconc (list :error (list 'error 'http-redirect-limit
redirect-uri))
(car url-callback-arguments)))
(setq success t))))))
(4 ; Client error
;; 400 Bad Request
;; 401 Unauthorized
;; 402 Payment required
;; 403 Forbidden
;; 404 Not found
;; 405 Method not allowed
;; 406 Not acceptable
;; 407 Proxy authentication required
;; 408 Request time-out
;; 409 Conflict
;; 410 Gone
;; 411 Length required
;; 412 Precondition failed
;; 413 Request entity too large
;; 414 Request-URI too large
;; 415 Unsupported media type
;; 416 Requested range not satisfiable
;; 417 Expectation failed
;; 422 Unprocessable Entity (Added by DAV)
;; 423 Locked
;; 424 Failed Dependency
(case url-http-response-status
(401
;; The request requires user authentication. The response
;; MUST include a WWW-Authenticate header field containing a
;; challenge applicable to the requested resource. The
;; client MAY repeat the request with a suitable
;; Authorization header field.
(url-http-handle-authentication nil))
(402
;; This code is reserved for future use
(url-mark-buffer-as-dead buffer)
(error "Somebody wants you to give them money"))
(403
;; The server understood the request, but is refusing to
;; fulfill it. Authorization will not help and the request
;; SHOULD NOT be repeated.
(setq success t))
(404
;; Not found
(setq success t))
(405
;; The method specified in the Request-Line is not allowed
;; for the resource identified by the Request-URI. The
;; response MUST include an Allow header containing a list of
;; valid methods for the requested resource.
(setq success t))
(406
;; The resource identified by the request is only capable of
;; generating response entities which have content
;; characteristics nota cceptable according to the accept
;; headers sent in the request.
(setq success t))
(407
;; This code is similar to 401 (Unauthorized), but indicates
;; that the client must first authenticate itself with the
;; proxy. The proxy MUST return a Proxy-Authenticate header
;; field containing a challenge applicable to the proxy for
;; the requested resource.
(url-http-handle-authentication t))
(408
;; The client did not produce a request within the time that
;; the server was prepared to wait. The client MAY repeat
;; the request without modifications at any later time.
(setq success t))
(409
;; The request could not be completed due to a conflict with
;; the current state of the resource. This code is only
;; allowed in situations where it is expected that the user
;; mioght be able to resolve the conflict and resubmit the
;; request. The response body SHOULD include enough
;; information for the user to recognize the source of the
;; conflict.
(setq success t))
(410
;; The requested resource is no longer available at the
;; server and no forwarding address is known.
(setq success t))
(411
;; The server refuses to accept the request without a defined
;; Content-Length. The client MAY repeat the request if it
;; adds a valid Content-Length header field containing the
;; length of the message-body in the request message.
;;
;; NOTE - this will never happen because
;; `url-http-create-request' automatically calculates the
;; content-length.
(setq success t))
(412
;; The precondition given in one or more of the
;; request-header fields evaluated to false when it was
;; tested on the server.
(setq success t))
((413 414)
;; The server is refusing to process a request because the
;; request entity|URI is larger than the server is willing or
;; able to process.
(setq success t))
(415
;; The server is refusing to service the request because the
;; entity of the request is in a format not supported by the
;; requested resource for the requested method.
(setq success t))
(416
;; A server SHOULD return a response with this status code if
;; a request included a Range request-header field, and none
;; of the range-specifier values in this field overlap the
;; current extent of the selected resource, and the request
;; did not include an If-Range request-header field.
(setq success t))
(417
;; The expectation given in an Expect request-header field
;; could not be met by this server, or, if the server is a
;; proxy, the server has unambiguous evidence that the
;; request could not be met by the next-hop server.
(setq success t))
(otherwise
;; The request could not be understood by the server due to
;; malformed syntax. The client SHOULD NOT repeat the
;; request without modifications.
(setq success t)))
;; Tell the callback that an error occurred, and what the
;; status code was.
(when success
(setf (car url-callback-arguments)
(nconc (list :error (list 'error 'http url-http-response-status))
(car url-callback-arguments)))))
(5
;; 500 Internal server error
;; 501 Not implemented
;; 502 Bad gateway
;; 503 Service unavailable
;; 504 Gateway time-out
;; 505 HTTP version not supported
;; 507 Insufficient storage
(setq success t)
(case url-http-response-status
(501
;; The server does not support the functionality required to
;; fulfill the request.
nil)
(502
;; The server, while acting as a gateway or proxy, received
;; an invalid response from the upstream server it accessed
;; in attempting to fulfill the request.
nil)
(503
;; The server is currently unable to handle the request due
;; to a temporary overloading or maintenance of the server.
;; The implication is that this is a temporary condition
;; which will be alleviated after some delay. If known, the
;; length of the delay MAY be indicated in a Retry-After
;; header. If no Retry-After is given, the client SHOULD
;; handle the response as it would for a 500 response.
nil)
(504
;; The server, while acting as a gateway or proxy, did not
;; receive a timely response from the upstream server
;; specified by the URI (e.g. HTTP, FTP, LDAP) or some other
;; auxiliary server (e.g. DNS) it needed to access in
;; attempting to complete the request.
nil)
(505
;; The server does not support, or refuses to support, the
;; HTTP protocol version that was used in the request
;; message.
nil)
(507 ; DAV
;; The method could not be performed on the resource
;; because the server is unable to store the representation
;; needed to successfully complete the request. This
;; condition is considered to be temporary. If the request
;; which received this status code was the result of a user
;; action, the request MUST NOT be repeated until it is
;; requested by a separate user action.
nil))
;; Tell the callback that an error occurred, and what the
;; status code was.
(when success
(setf (car url-callback-arguments)
(nconc (list :error (list 'error 'http url-http-response-status))
(car url-callback-arguments)))))
(otherwise
(error "Unknown class of HTTP response code: %d (%d)"
class url-http-response-status)))
(if (not success)
(url-mark-buffer-as-dead buffer))
(url-http-debug "Finished parsing HTTP headers: %S" success)
(widen)
success))
;; Miscellaneous
(defun url-http-activate-callback ()
"Activate callback specified when this buffer was created."
(declare (special url-http-process
url-callback-function
url-callback-arguments))
(url-http-mark-connection-as-free (url-host url-current-object)
(url-port url-current-object)
url-http-process)
(url-http-debug "Activating callback in buffer (%s)" (buffer-name))
(apply url-callback-function url-callback-arguments))
;; )
;; These unfortunately cannot be macros... please ignore them!
(defun url-http-idle-sentinel (proc why)
"Remove (now defunct) process PROC from the list of open connections."
(maphash (lambda (key val)
(if (memq proc val)
(puthash key (delq proc val) url-http-open-connections)))
url-http-open-connections))
(defun url-http-end-of-document-sentinel (proc why)
;; Sentinel used for old HTTP/0.9 or connections we know are going
;; to die as the 'end of document' notifier.
(url-http-debug "url-http-end-of-document-sentinel in buffer (%s)"
(process-buffer proc))
(url-http-idle-sentinel proc why)
(with-current-buffer (process-buffer proc)
(goto-char (point-min))
(if (not (looking-at "HTTP/"))
;; HTTP/0.9 just gets passed back no matter what
(url-http-activate-callback)
(if (url-http-parse-headers)
(url-http-activate-callback)))))
(defun url-http-simple-after-change-function (st nd length)
;; Function used when we do NOT know how long the document is going to be
;; Just _very_ simple 'downloaded %d' type of info.
(declare (special url-http-end-of-headers))
(url-lazy-message "Reading %s..." (url-pretty-length nd)))
(defun url-http-content-length-after-change-function (st nd length)
"Function used when we DO know how long the document is going to be.
More sophisticated percentage downloaded, etc.
Also does minimal parsing of HTTP headers and will actually cause
the callback to be triggered."
(declare (special url-current-object
url-http-end-of-headers
url-http-content-length
url-http-content-type
url-http-process))
(if url-http-content-type
(url-display-percentage
"Reading [%s]... %s of %s (%d%%)"
(url-percentage (- nd url-http-end-of-headers)
url-http-content-length)
url-http-content-type
(url-pretty-length (- nd url-http-end-of-headers))
(url-pretty-length url-http-content-length)
(url-percentage (- nd url-http-end-of-headers)
url-http-content-length))
(url-display-percentage
"Reading... %s of %s (%d%%)"
(url-percentage (- nd url-http-end-of-headers)
url-http-content-length)
(url-pretty-length (- nd url-http-end-of-headers))
(url-pretty-length url-http-content-length)
(url-percentage (- nd url-http-end-of-headers)
url-http-content-length)))
(if (> (- nd url-http-end-of-headers) url-http-content-length)
(progn
;; Found the end of the document! Wheee!
(url-display-percentage nil nil)
(url-lazy-message "Reading... done.")
(if (url-http-parse-headers)
(url-http-activate-callback)))))
(defun url-http-chunked-encoding-after-change-function (st nd length)
"Function used when dealing with 'chunked' encoding.
Cannot give a sophisticated percentage, but we need a different
function to look for the special 0-length chunk that signifies
the end of the document."
(declare (special url-current-object
url-http-end-of-headers
url-http-content-type
url-http-chunked-length
url-http-chunked-counter
url-http-process url-http-chunked-start))
(save-excursion
(goto-char st)
(let ((read-next-chunk t)
(case-fold-search t)
(regexp nil)
(no-initial-crlf nil))
;; We need to loop thru looking for more chunks even within
;; one after-change-function call.
(while read-next-chunk
(setq no-initial-crlf (= 0 url-http-chunked-counter))
(if url-http-content-type
(url-display-percentage nil
"Reading [%s]... chunk #%d"
url-http-content-type url-http-chunked-counter)
(url-display-percentage nil
"Reading... chunk #%d"
url-http-chunked-counter))
(url-http-debug "Reading chunk %d (%d %d %d)"
url-http-chunked-counter st nd length)
(setq regexp (if no-initial-crlf
"\\([0-9a-z]+\\).*\r?\n"
"\r?\n\\([0-9a-z]+\\).*\r?\n"))
(if url-http-chunked-start
;; We know how long the chunk is supposed to be, skip over
;; leading crap if possible.
(if (> nd (+ url-http-chunked-start url-http-chunked-length))
(progn
(url-http-debug "Got to the end of chunk #%d!"
url-http-chunked-counter)
(goto-char (+ url-http-chunked-start
url-http-chunked-length)))
(url-http-debug "Still need %d bytes to hit end of chunk"
(- (+ url-http-chunked-start
url-http-chunked-length)
nd))
(setq read-next-chunk nil)))
(if (not read-next-chunk)
(url-http-debug "Still spinning for next chunk...")
(if no-initial-crlf (skip-chars-forward "\r\n"))
(if (not (looking-at regexp))
(progn
;; Must not have received the entirety of the chunk header,
;; need to spin some more.
(url-http-debug "Did not see start of chunk @ %d!" (point))
(setq read-next-chunk nil))
(add-text-properties (match-beginning 0) (match-end 0)
(list 'start-open t
'end-open t
'chunked-encoding t
'face 'cursor
'invisible t))
(setq url-http-chunked-length (string-to-number (buffer-substring
(match-beginning 1)
(match-end 1))
16)
url-http-chunked-counter (1+ url-http-chunked-counter)
url-http-chunked-start (set-marker
(or url-http-chunked-start
(make-marker))
(match-end 0)))
; (if (not url-http-debug)
(delete-region (match-beginning 0) (match-end 0));)
(url-http-debug "Saw start of chunk %d (length=%d, start=%d"
url-http-chunked-counter url-http-chunked-length
(marker-position url-http-chunked-start))
(if (= 0 url-http-chunked-length)
(progn
;; Found the end of the document! Wheee!
(url-http-debug "Saw end of stream chunk!")
(setq read-next-chunk nil)
(url-display-percentage nil nil)
;; Every chunk, even the last 0-length one, is
;; terminated by CRLF. Skip it.
(when (looking-at "\r?\n")
(url-http-debug "Removing terminator of last chunk")
(delete-region (match-beginning 0) (match-end 0)))
(if (re-search-forward "^\r*$" nil t)
(url-http-debug "Saw end of trailers..."))
(if (url-http-parse-headers)
(url-http-activate-callback))))))))))
(defun url-http-wait-for-headers-change-function (st nd length)
;; This will wait for the headers to arrive and then splice in the
;; next appropriate after-change-function, etc.
(declare (special url-current-object
url-http-end-of-headers
url-http-content-type
url-http-content-length
url-http-transfer-encoding
url-callback-function
url-callback-arguments
url-http-process
url-http-method
url-http-after-change-function
url-http-response-status))
(url-http-debug "url-http-wait-for-headers-change-function (%s)"
(buffer-name))
(when (not (bobp))
(let ((end-of-headers nil)
(old-http nil)
(content-length nil))
(goto-char (point-min))
(if (and (looking-at ".*\n") ; have one line at least
(not (looking-at "^HTTP/[1-9]\\.[0-9]")))
;; Not HTTP/x.y data, must be 0.9
;; God, I wish this could die.
(setq end-of-headers t
url-http-end-of-headers 0
old-http t)
(when (re-search-forward "^\r*$" nil t)
;; Saw the end of the headers
(url-http-debug "Saw end of headers... (%s)" (buffer-name))
(setq url-http-end-of-headers (set-marker (make-marker)
(point))
end-of-headers t)
(url-http-clean-headers)))