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;;;;
;;;; Copyright (c) 2008 Zachary Beane, All Rights Reserved
;;;;
;;;; Redistribution and use in source and binary forms, with or without
;;;; modification, are permitted provided that the following conditions
;;;; are met:
;;;;
;;;; * Redistributions of source code must retain the above copyright
;;;; notice, this list of conditions and the following disclaimer.
;;;;
;;;; * Redistributions in binary form must reproduce the above
;;;; copyright notice, this list of conditions and the following
;;;; disclaimer in the documentation and/or other materials
;;;; provided with the distribution.
;;;;
;;;; THIS SOFTWARE IS PROVIDED BY THE AUTHOR 'AS IS' AND ANY EXPRESSED
;;;; OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
;;;; WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
;;;; ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
;;;; DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
;;;; DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
;;;; GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
;;;; INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
;;;; WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
;;;; NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
;;;; SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
;;;;
;;;; redirects.lisp

(in-package #:zs3)

(defvar *permanent-redirects*
  (make-hash-table :test 'equalp)
  "Some bucket operations make permanent redirects to different
endpoints. This table stores access-key/bucket redirects for use when
creating requests.")

(defun redirect-key (endpoint bucket &key
                     ((:credentials *credentials*) *credentials*))
  (list endpoint bucket (access-key *credentials*)))


(defun redirected-endpoint (endpoint bucket &key
                            ((:credentials *credentials*) *credentials*))
  (gethash (redirect-key endpoint bucket) *permanent-redirects* endpoint))

(defun (setf redirected-endpoint) (new-value endpoint bucket &key
                                   ((:credentials *credentials*) *credentials*))
  (let ((key (redirect-key endpoint bucket)))
    (if (not new-value)
        (progn (remhash key *permanent-redirects*) new-value)
        (setf (gethash key *permanent-redirects*) new-value))))

(defun clear-redirects ()
  (clrhash *permanent-redirects*))
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