blob: 244e28873d4ccbc041e549c564555ae779e39037 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
|
;; disfluid, implementation of the Solid specification
;; Copyright (C) 2020, 2021 Vivien Kraus
;; This program is free software: you can redistribute it and/or modify
;; it under the terms of the GNU Affero General Public License as
;; published by the Free Software Foundation, either version 3 of the
;; License, or (at your option) any later version.
;; This program 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 Affero General Public License for more details.
;; You should have received a copy of the GNU Affero General Public License
;; along with this program. If not, see <https://www.gnu.org/licenses/>.
(define-module (webid-oidc server precondition)
#:use-module (webid-oidc errors)
#:use-module (webid-oidc server resource path)
#:use-module (webid-oidc server resource content)
#:use-module (webid-oidc cache)
#:use-module (webid-oidc fetch)
#:use-module (webid-oidc server resource wac)
#:use-module ((webid-oidc stubs) #:prefix stubs:)
#:use-module (webid-oidc rdf-index)
#:use-module ((webid-oidc refresh-token) #:prefix refresh:)
#:use-module ((webid-oidc parameters) #:prefix p:)
#:use-module (web uri)
#:use-module (web response)
#:use-module (rdf rdf)
#:use-module (turtle tordf)
#:use-module (turtle fromrdf)
#:use-module (rnrs bytevectors)
#:use-module (ice-9 exceptions)
#:use-module (ice-9 receive)
#:use-module (ice-9 optargs)
#:use-module (ice-9 iconv)
#:use-module (ice-9 textual-ports)
#:use-module (ice-9 binary-ports)
#:use-module (ice-9 threads)
#:use-module (rnrs bytevectors)
#:use-module (oop goops)
#:export
(
&precondition-failed
make-precondition-failed
precondition-failed?
precondition-failed-path
precondition-failed-if-match
precondition-failed-if-none-match
precondition-failed-etag
check-precondition
))
(define-exception-type
&precondition-failed
&external-error
make-precondition-failed
precondition-failed?
(path precondition-failed-path)
(if-match precondition-failed-if-match)
(if-none-match precondition-failed-if-none-match)
(etag precondition-failed-etag))
(define (the-etag object)
;; Sometimes the user passes a pair as an etag (just like what
;; request-if-match may return).
(if (pair? object)
(car object)
object))
(define (check-if-match if-match real-etag)
;; if-match is #f if no filter is used
(or (not if-match)
(eq? if-match '*)
(let check-rest ((precondition if-match))
(and (not (null? precondition))
(let ((first (the-etag (car precondition)))
(rest (cdr precondition)))
(or (equal? first real-etag)
(check-rest rest)))))))
(define (check-if-none-match if-none-match real-etag)
;; if-none-match is #f if there is no filter
(or (not if-none-match)
(if (eq? if-none-match '*)
(not real-etag)
;; if-none-match is a list
(let check-rest ((forbidden if-none-match))
(or (null? forbidden)
(let ((first (the-etag (car forbidden)))
(rest (cdr forbidden)))
(and (not (equal? first real-etag))
(check-rest rest))))))))
(define (check-precondition path if-match if-none-match real-etag)
(unless (and (check-if-match if-match real-etag)
(check-if-none-match if-none-match real-etag))
(let ((error
(make-precondition-failed path if-match if-none-match real-etag)))
(unless real-etag
(set! error
(make-exception error (make-path-not-found path))))
(raise-exception error))))
|
