Allow specifying whether to inhibit cookies on a per-URL basis

* url-http.el (url-http-create-request): Don't send cookies unless
requested.
(url-http-parse-headers): Don't store cookies unless requested.

* url.el (url-retrieve): Ditto

* url-queue.el (url-queue-retrieve): Take an optional
`inhibit-cookies' parameter.

* url-parse.el (url): Add the `use-cookies' slot to the URL struct
to be able to keep track of whether to do cookies or not on a
per-URL basis.

lisp/url/ChangeLog

@@ -1,3 +1,18 @@
+2012-02-08  Lars Ingebrigtsen  <larsi@gnus.org>
+
+	* url-parse.el (url): Add the `use-cookies' slot to the URL struct
+	to be able to keep track of whether to do cookies or not on a
+	per-URL basis.
+
+	* url-queue.el (url-queue-retrieve): Take an optional
+	`inhibit-cookies' parameter.
+
+	* url.el (url-retrieve): Ditto
+
+	* url-http.el (url-http-create-request): Don't send cookies unless
+	requested.
+	(url-http-parse-headers): Don't store cookies unless requested.
+
 2012-02-06  Lars Ingebrigtsen  <larsi@gnus.org>
 
 	* url-cache.el (url-cache-prune-cache): New function.

lisp/url/url-http.el

@@ -320,8 +320,10 @@ request.")
              ;; Authorization
              auth
              ;; Cookies
-             (url-cookie-generate-header-lines host real-fname
-                                               (equal "https" (url-type url-http-target-url)))
+	     (when (url-use-cookies url-http-target-url)
+	       (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)))
@@ -498,7 +500,8 @@ should be shown to the user."
 	(file-name-handler-alist 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)
+    (when (url-use-cookies url-http-target-url)
+      (url-http-handle-cookies))
 
     (case class
       ;; Classes of response codes

lisp/url/url-parse.el

@@ -35,7 +35,8 @@
                           (&optional type user password host portspec filename
                                      target attributes fullness))
             (:copier nil))
-  type user password host portspec filename target attributes fullness silent)
+  type user password host portspec filename target attributes fullness
+  silent (use-cookies t))
 
 (defsubst url-port (urlobj)
   (or (url-portspec urlobj)

lisp/url/url-queue.el

@@ -50,10 +50,11 @@
 
 (defstruct url-queue
   url callback cbargs silentp
-  buffer start-time pre-triggered)
+  buffer start-time pre-triggered
+  inhibit-cookiesp)
 
 ;;;###autoload
-(defun url-queue-retrieve (url callback &optional cbargs silent)
+(defun url-queue-retrieve (url callback &optional cbargs silent inhibit-cookies)
   "Retrieve URL asynchronously and call CALLBACK with CBARGS when finished.
 Like `url-retrieve' (which see for details of the arguments), but
 controls the level of parallelism via the
@@ -63,7 +64,8 @@ controls the level of parallelism via the
 		(list (make-url-queue :url url
 				      :callback callback
 				      :cbargs cbargs
-				      :silentp silent))))
+				      :silentp silent
+				      :inhibit-cookiesp inhibit-cookies))))
   (url-queue-setup-runners))
 
 ;; To ensure asynch behaviour, we start the required number of queue
@@ -131,7 +133,8 @@ controls the level of parallelism via the
 	(ignore-errors
 	  (url-retrieve (url-queue-url job)
 			#'url-queue-callback-function (list job)
-			(url-queue-silentp job)))))
+			(url-queue-silentp job)
+			(url-queue-inhibit-cookiesp job)))))
 
 (defun url-queue-prune-old-entries ()
   (let (dead-jobs)

lisp/url/url.el

@@ -123,7 +123,7 @@ variable in the original buffer as a forwarding pointer.")
 (autoload 'url-cache-prune-cache "url-cache")
 
 ;;;###autoload
-(defun url-retrieve (url callback &optional cbargs silent)
+(defun url-retrieve (url callback &optional cbargs silent inhibit-cookies)
   "Retrieve URL asynchronously and call CALLBACK with CBARGS when finished.
 URL is either a string or a parsed URL.
 
@@ -147,7 +147,9 @@ The variables `url-request-data', `url-request-method' and
 request; dynamic binding of other variables doesn't necessarily
 take effect.
 
-If SILENT, then don't message progress reports and the like."
+If SILENT, then don't message progress reports and the like.
+If INHIBIT-COOKIES, cookies will neither be stored nor sent to
+the server."
 ;;; 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,
@@ -158,14 +160,18 @@ If SILENT, then don't message progress reports and the like."
 ;;; 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) silent))
+  (url-retrieve-internal url callback (cons nil cbargs) silent
+			 inhibit-cookies))
 
-(defun url-retrieve-internal (url callback cbargs &optional silent)
+(defun url-retrieve-internal (url callback cbargs &optional silent
+				  inhibit-cookies)
   "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'.
 
-If SILENT, don't message progress reports and the like."
+If SILENT, don't message progress reports and the like.
+If INHIBIT-COOKIES, cookies will neither be stored nor sent to
+the server."
   (url-do-setup)
   (url-gc-dead-buffers)
   (if (stringp url)
@@ -177,6 +183,7 @@ If SILENT, don't message progress reports and the like."
   (unless (url-type url)
     (error "Bad url: %s" (url-recreate-url url)))
   (setf (url-silent url) silent)
+  (setf (url-use-cookies url) (not inhibit-cookies))
   ;; Once in a while, remove old entries from the URL cache.
   (when (zerop (% url-retrieve-number-of-calls 1000))
     (url-cache-prune-cache))