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;;;;
;;;; Copyright (c) 2008, 2015 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.
;;;;
;;;; credentials.lisp
(in-package #:zs3)
(defvar *credentials* nil
"Used as the default initarg value of :CREDENTIALS when creating a
request.")
(define-condition unsupported-credentials (error)
((object
:initarg :object
:accessor unsupported-credentials-object))
(:report (lambda (c s)
(format s "The value ~A is unsupported as S3 credentials. (Did you set *CREDENTIALS*?)~@
See http://www.xach.com/lisp/zs3/#*credentials* ~
for supported credentials formats."
(unsupported-credentials-object c)))))
(defgeneric access-key (credentials)
(:method (object)
(error 'unsupported-credentials :object object))
(:method ((list cons))
(first list)))
(defgeneric secret-key (credentials)
(:method (object)
(error 'unsupported-credentials :object object))
(:method ((list cons))
(second list)))
(defgeneric security-token (credentials)
(:method ((object t))
nil)
(:method ((list cons))
(third list)))
;;; Lazy-loading credentials
(defclass lazy-credentials-mixin () ())
(defmethod slot-unbound ((class t) (credentials lazy-credentials-mixin)
(slot (eql 'access-key)))
(nth-value 0 (initialize-lazy-credentials credentials)))
(defmethod slot-unbound ((class t) (credentials lazy-credentials-mixin)
(slot (eql 'secret-key)))
(nth-value 1 (initialize-lazy-credentials credentials)))
(defmethod slot-unbound ((class t) (credentials lazy-credentials-mixin)
(slot (eql 'security-token)))
(nth-value 2 (initialize-lazy-credentials credentials)))
;;; Loading credentials from a file
(defclass file-credentials (lazy-credentials-mixin)
((file
:initarg :file
:accessor file)
(access-key
:accessor access-key)
(secret-key
:accessor secret-key)
(security-token
:accessor security-token)))
(defgeneric initialize-lazy-credentials (credentials)
(:method ((credentials file-credentials))
(with-open-file (stream (file credentials))
(values (setf (access-key credentials) (read-line stream))
(setf (secret-key credentials) (read-line stream))
(setf (security-token credentials) (read-line stream nil))))))
(defun file-credentials (file)
(make-instance 'file-credentials
:file file))
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