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
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
|
;; 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 client-manifest)
#:use-module (webid-oidc errors)
#:use-module (webid-oidc server endpoint)
#:use-module (webid-oidc fetch)
#:use-module (webid-oidc web-i18n)
#:use-module (webid-oidc serializable)
#:use-module ((webid-oidc stubs) #:prefix stubs:)
#:use-module ((webid-oidc parameters) #:prefix p:)
#:use-module (web uri)
#:use-module (web response)
#:use-module (rnrs bytevectors)
#:use-module (srfi srfi-19)
#:use-module (srfi srfi-26)
#:use-module (ice-9 receive)
#:use-module (ice-9 optargs)
#:use-module (rdf rdf)
#:use-module (turtle tordf)
#:use-module (ice-9 exceptions)
#:use-module (ice-9 match)
#:use-module (sxml match)
#:use-module (sxml simple)
#:use-module (oop goops)
#:declarative? #t
#:export
(
&invalid-client-manifest
make-invalid-client-manifest
invalid-client-manifest?
&unauthorized-redirect-uri
make-unauthorized-redirect-uri
unauthorized-redirect-uri?
&inconsistent-client-manifest
make-inconsistent-client-manifest
inconsistent-client-manifest?
&cannot-serve-public-manifest
make-cannot-serve-public-manifest
cannot-serve-public-manifest?
&cannot-fetch-client-manifest
make-cannot-fetch-client-manifest
cannot-fetch-client-manifest?
<client-manifest>
client-id
redirect-uris
->json-data
check-redirect-uri
serve
))
(define-exception-type
&invalid-client-manifest
&external-error
make-invalid-client-manifest
invalid-client-manifest?)
(define-exception-type
&unauthorized-redirect-uri
&external-error
make-unauthorized-redirect-uri
unauthorized-redirect-uri?)
(define-exception-type
&inconsistent-client-manifest
&external-error
make-inconsistent-client-manifest
inconsistent-client-manifest?)
(define-exception-type
&cannot-serve-public-manifest
&external-error
make-cannot-serve-public-manifest
cannot-serve-public-manifest?)
(define-exception-type
&cannot-fetch-client-manifest
&external-error
make-cannot-fetch-client-manifest
cannot-fetch-client-manifest?)
(define public-client-uri
(string->uri "http://www.w3.org/ns/solid/terms#PublicOidcClient"))
(define-class <client-manifest> ()
(client-id #:init-keyword #:client-id #:accessor client-id #:->jwks uri->string)
(redirect-uris #:init-keyword #:redirect-uris #:accessor redirect-uris #:->jwks uri->string)
#:metaclass <plugin-class>
#:module-name '(webid-oidc client-manifest))
(define-method (initialize (client <client-manifest>) initargs)
(next-method)
(let-keywords
initargs #t
((client-id #f)
(redirect-uris #f))
(let do-initialize ((client-id client-id)
(redirect-uris redirect-uris))
(when (list? redirect-uris)
(set! redirect-uris
(map
(match-lambda
((or (? string? (= string->uri (? uri? value)))
value)
value))
redirect-uris)))
(cond
((string? client-id)
(do-initialize (string->uri client-id) redirect-uris))
((equal? client-id public-client-uri)
(slot-set! client 'client-id client-id)
(slot-set! client 'redirect-uris '()))
((not redirect-uris)
(receive (response response-body) ((p:anonymous-http-request) client-id)
(with-exception-handler
(lambda (error)
(raise-exception
(make-exception
(make-cannot-fetch-client-manifest)
(make-exception-with-message
(if (exception-with-message? error)
(format #f (G_ "cannot fetch a client manifest: ~a")
(exception-message error))
(format #f (G_ "cannot fetch a client manifest"))))
error)))
(lambda ()
(when (bytevector? response-body)
(set! response-body (utf8->string response-body)))
(unless (eqv? (response-code response) 200)
(raise-exception
(make-exception
(make-exception-with-message
(format #f (G_ "the server responded with code ~a")
(response-code response)))
(make-user-message
(call-with-input-string
(format #f (W_ "<p>The server hosting your application responded with code ~a.<p>")
(response-code response))
xml->sxml)))))
(let ((json-data (stubs:json-string->scm response-body)))
(let ((new-client-id (assq-ref json-data 'client_id))
(redirect-uris (assq-ref json-data 'redirect_uris)))
(unless (string? new-client-id)
(raise-exception
(make-exception
(make-exception-with-message
(G_ "the client manifest does not have a client_id field"))
(make-user-message
(call-with-input-string
(format #f (W_ "<p>The server hosting your application does not behave correctly, because it lacks the client_id field.<p>"))
xml->sxml)))))
(set! redirect-uris
(let fix-redirect-uris ((redirect-uris redirect-uris))
(match redirect-uris
((? vector? (= vector->list redirect-uris))
redirect-uris)
((? list? redirect-uris)
(map fix-redirect-uris redirect-uris))
((? string? (= string->uri (? uri? uri)))
uri)
(anything anything))))
(set! new-client-id
(match new-client-id
((? string? (= string->uri (? uri? uri)))
uri)
(anything anything)))
(unless redirect-uris
(raise-exception
(make-exception
(make-exception-with-message
(G_ "the client manifest does not have a redirect_uris field"))
(make-user-message
(call-with-input-string
(format #f (W_ "<p>The server hosting your application does not behave correctly, because it lacks the redirect_uris field.<p>"))
xml->sxml)))))
(unless new-client-id
(raise-exception
(make-exception
(make-exception-with-message
(G_ "the client manifest does not have a client_id field"))
(make-user-message
(call-with-input-string
(format #f (W_ "<p>The server hosting your application does not behave correctly, because it lacks the client_id field.<p>"))
xml->sxml)))))
(unless (equal? client-id new-client-id)
(raise-exception
(make-exception
(make-inconsistent-client-manifest)
(make-exception-with-message
(format #f (G_ "the client manifest under ~s has a client_id of ~s")
(uri->string client-id)
(uri->string new-client-id)))
(make-user-message
(call-with-input-string
(format #f (W_ "<p>The application you want to use does not control the domain name it appears to represent.</p>"))
xml->sxml)))))
(do-initialize new-client-id redirect-uris)))))))
(else
(unless (uri? client-id)
(scm-error 'wrong-type-arg "make"
(G_ "#:client-id should be an URI")
'()
(list client-id)))
(unless (let check-redirect-uris ((redirect-uris redirect-uris))
(match redirect-uris
(() #t)
(((? uri?) redirect-uris ...)
(check-redirect-uris redirect-uris))))
(scm-error 'wrong-type-arg "make"
(G_ "#:redirect-uris should be a list of URIs")
'()
(list redirect-uri)))
(slot-set! client 'client-id client-id)
(slot-set! client 'redirect-uris redirect-uris))))))
(define (check-redirect mf uris redir)
(match uris
(()
(let ((final-message
(format #f (G_ "the client manifest does not allow ~s as a redirection uri")
(uri->string redir)))
(final-user-message
(call-with-input-string
(format #f (W_ "<p>The application wants to get your
authorization through <strong>~a</strong>, which is not
approved.</p>")
(call-with-output-string
(cute sxml->xml `(*TOP* ,(uri->string redir)) <>)))
xml->sxml)))
(raise-exception
(make-exception
(make-unauthorized-redirect-uri)
(make-exception-with-message final-message)
(make-user-message final-user-message)))))
(((? (cute equal? <> redir) redir) _ ...)
#t)
((_ uris ...)
(check-redirect mf uris redir))))
(define-method (check-redirect-uri (mf <client-manifest>) redir)
(unless (uri? redir)
(set! redir (string->uri redir)))
(or (equal? (client-id mf) public-client-uri)
(check-redirect mf (redirect-uris mf) redir)))
(define-method (->json-data (mf <client-manifest>))
(let ((other
(catch 'goops-error
(lambda ()
(next-method))
(lambda _
'()))))
`((@context . "https://www.w3.org/ns/solid/oidc-context.jsonld")
(client_id . ,(uri->string (client-id mf)))
(redirect_uris . ,(list->vector (map uri->string (redirect-uris mf))))
,@other)))
(define-method (serve (mf <client-manifest>) expiration-date)
(when (equal? (client-id mf) public-client-uri)
(let ((final-message
(format #f (G_ "cannot serve the public manifest"))))
(raise-exception
(make-exception
(make-cannot-serve-public-manifest)
(make-exception-with-message final-message)))))
(let ((json-object (stubs:scm->json-string
(->json-data mf))))
(let ((etag (stubs:hash 'SHA-256 json-object)))
(values (build-response #:headers `((content-type application/ld+json)
(etag . (,etag . #t))
,@(if expiration-date
`((expires . ,expiration-date))
`((cache-control public must-revalidate)))))
json-object))))
|
