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;; 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 oidc-configuration)
#:use-module (webid-oidc jwk)
#:use-module (webid-oidc errors)
#:use-module (webid-oidc web-i18n)
#:use-module ((webid-oidc stubs) #:prefix stubs:)
#:use-module (web uri)
#:use-module (web client)
#:use-module (web response)
#:use-module (rnrs bytevectors)
#:use-module (srfi srfi-19)
#:use-module (ice-9 receive)
#:use-module (ice-9 optargs)
#:use-module (ice-9 exceptions)
#:use-module (ice-9 match)
#:declarative? #t
#:export
(
&invalid-oidc-configuration
make-invalid-oidc-configuratioon
invalid-oidc-configuration?
the-oidc-configuration
oidc-configuration?
oidc-configuration-jwks-uri
oidc-configuration-authorization-endpoint
oidc-configuration-token-endpoint
oidc-configuration-jwks
serve-oidc-configuration
get-oidc-configuration
))
(define-exception-type
&invalid-oidc-configuration
&external-error
make-invalid-oidc-configuration
invalid-oidc-configuration?)
(define (the-oidc-configuration x)
(with-exception-handler
(lambda (error)
(let ((final-message
(if (exception-with-message? error)
(format #f (G_ "the OIDC configuration is invalid: ~a")
(exception-message error))
(format #f (G_ "the OIDC configuration is invalid")))))
(raise-exception
(make-exception
(make-invalid-oidc-configuration)
(make-exception-with-message final-message)
error))))
(lambda ()
(let examine ((data x)
(jwks-uri #f)
(token-endpoint #f)
(authorization-endpoint #f)
(solid-oidc-supported #f)
(other-fields '()))
(match data
(()
(unless (and jwks-uri token-endpoint authorization-endpoint solid-oidc-supported)
(fail (format #f (G_ "the OIDC configuration does not have: ~s")
`(,@(if jwks-uri '() '("jwks_uri"))
,@(if token-endpoint '() '("token_endpoint"))
,@(if authorization-endpoint '() '("authorization_endpoint"))
,@(if solid-oidc-supported '() '("solid_oidc_supported"))))))
`((jwks_uri . ,(uri->string jwks-uri))
(token_endpoint . ,(uri->string token-endpoint))
(authorization_endpoint . ,(uri->string authorization-endpoint))
(solid_oidc_supported . "https://solidproject.org/TR/solid-oidc")
,@(reverse other-fields)))
((('jwks_uri . (? string->uri (? string? given-jwks-uri))) data ...)
(examine data (or jwks-uri (string->uri given-jwks-uri))
token-endpoint authorization-endpoint
solid-oidc-supported other-fields))
((('jwks_uri . invalid) data ...)
(fail (format #f (G_ "invalid JWKS URI: ~s")
invalid)))
((('token_endpoint . (? string->uri (? string? given-token-endpoint))) data ...)
(examine data jwks-uri
(or token-endpoint (string->uri given-token-endpoint))
authorization-endpoint solid-oidc-supported other-fields))
((('token_endpoint . invalid) data ...)
(fail (format #f (G_ "invalid token endpoint: ~s")
invalid)))
((('authorization_endpoint
. (? string->uri (? string? given-authorization-endpoint)))
data ...)
(examine data jwks-uri token-endpoint
(or authorization-endpoint (string->uri given-authorization-endpoint))
solid-oidc-supported other-fields))
((('authorization_endpoint . invalid) data ...)
(fail (format #f (G_ "invalid authorization endpoint: ~s")
invalid)))
((('solid_oidc_supported . "https://solidproject.org/TR/solid-oidc")
data ...)
(examine data jwks-uri token-endpoint authorization-endpoint
(or solid-oidc-supported #t)
other-fields))
((('solid_oidc_supported . incorrect) data ...)
(fail (format #f (G_ "\"solid_oidc_supported\" should be set to ~s, not ~s")
"https://solidproject.org/TR/solid-oidc"
incorrect)))
((((? symbol? key) . value) data ...)
(examine data jwks-uri token-endpoint authorization-endpoint
solid-oidc-supported
`((,key . ,value) ,@other-fields)))
(else
(fail (format #f (G_ "invalid JSON object")))))))))
(define (oidc-configuration? obj)
(false-if-exception
(the-oidc-configuration obj)))
(define (uri-field what)
(lambda (x)
(let ((str (assq-ref (the-oidc-configuration x) what)))
(string->uri str))))
(define oidc-configuration-jwks-uri
(uri-field 'jwks_uri))
(define oidc-configuration-authorization-endpoint
(uri-field 'authorization_endpoint))
(define oidc-configuration-token-endpoint
(uri-field 'token_endpoint))
(define* (oidc-configuration-jwks cfg #:key (http-get http-get))
(let ((http-request-for-get-jwks
(lambda* (uri #:key (method 'GET))
(http-get uri))))
(get-jwks (oidc-configuration-jwks-uri cfg)
#:http-request http-request-for-get-jwks)))
(define (serve-oidc-configuration expiration-date cfg)
(values (build-response #:headers `((content-type . (application/json))
(expires . ,expiration-date)))
(stubs:scm->json-string cfg)))
(define* (get-oidc-configuration host
#:key
(userinfo #f)
(port #f)
(http-get http-get))
(when (and (string? host)
(false-if-exception
(string->uri host)))
;; host is something like "https://example.com"
(set! host (string->uri host)))
(when (uri? host)
(set! host (uri-host host)))
(let ((uri (build-uri 'https
#:userinfo userinfo
#:host host
#:port port
#:path "/.well-known/openid-configuration")))
(receive (response response-body) (http-get uri)
(with-exception-handler
(lambda (error)
(let ((final-message
(if (exception-with-message? error)
(format #f (G_ "cannot fetch the OIDC configuration: ~a")
(exception-message error))
(format #f (G_ "cannot fetch the OIDC configuration")))))
(raise-exception
(make-exception
(make-invalid-oidc-configuration)
(make-exception-with-message final-message)
error))))
(lambda ()
(unless (eqv? (response-code response) 200)
(fail (format #f (G_ "the server responded with ~s ~s")
(response-code response)
(response-reason-phrase response))))
(let ((content-type (response-content-type response)))
(unless content-type
(fail (format #f (G_ "there is no content-type"))))
(unless (and (eq? (car content-type) 'application/json)
(or (equal? (assoc-ref (cdr content-type) 'charset)
"utf-8")
(not (assoc-ref (cdr content-type) 'charset))))
(fail (format #f (G_ "unexpected content-type: ~s")
content-type)))
(unless (string? response-body)
(set! response-body (utf8->string response-body)))
(the-oidc-configuration (stubs:json-string->scm response-body))))))))
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