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;; webid-oidc, 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 resource-server)
#:use-module (webid-oidc errors)
#:use-module (webid-oidc oidc-configuration)
#:use-module (webid-oidc provider-confirmation)
#:use-module (webid-oidc jwk)
#:use-module (webid-oidc dpop-proof)
#:use-module (webid-oidc serve)
#:use-module (webid-oidc server create)
#:use-module (webid-oidc server read)
#:use-module (webid-oidc server update)
#:use-module (webid-oidc server delete)
#:use-module (webid-oidc server precondition)
#:use-module (webid-oidc http-link)
#:use-module ((webid-oidc config) #:prefix cfg:)
#:use-module (webid-oidc jti)
#:use-module (webid-oidc access-token)
#:use-module (web request)
#:use-module (web response)
#:use-module (web uri)
#:use-module (web server)
#:use-module (web client)
#:use-module (ice-9 optargs)
#:use-module (ice-9 receive)
#:use-module (ice-9 i18n)
#:use-module (ice-9 getopt-long)
#:use-module (ice-9 suspendable-ports)
#:use-module (ice-9 control)
#:use-module (sxml simple)
#:use-module (srfi srfi-19))
(define (G_ text)
(let ((out (gettext text)))
(if (string=? out text)
;; No translation, disambiguate
(car (reverse (string-split text #\|)))
out)))
(define*-public (make-authenticator jti-list
#:key
(server-uri #f)
(current-time current-time)
(http-get http-get))
(unless (and server-uri (uri? server-uri))
(error "You need to pass #:server-uri URI where URI is the public URI of the server, as a (web uri)."))
(lambda (request request-body)
(let ((headers (request-headers request))
(uri (request-uri request))
(method (request-method request))
(current-time
(let ((t current-time))
(when (thunk? t)
(set! t (t)))
(when (integer? t)
(set! t (make-time time-utc 0 t)))
(when (time? t)
(set! t (time-utc->date t)))
t)))
(let ((authz (assoc-ref headers 'authorization))
(dpop (assoc-ref headers 'dpop))
(full-uri (build-uri (uri-scheme server-uri)
#:userinfo (uri-userinfo server-uri)
#:host (uri-host server-uri)
#:port (uri-port server-uri)
#:path (string-append
"/"
(encode-and-join-uri-path
(append
(split-and-decode-uri-path (uri-path server-uri))
(split-and-decode-uri-path
(uri-path uri))))))))
(and authz dpop
(eq? (car authz) 'dpop)
(with-exception-handler
(lambda (error)
(format (current-error-port)
(G_ "~a: authentication failure: ~a\n")
(date->string current-time)
(error->str error))
#f)
(lambda ()
(let* ((lit-access-token (symbol->string (cadr authz)))
(access-token
(access-token-decode lit-access-token
#:http-get http-get))
(cnf/jkt (access-token-cnf/jkt access-token))
(dpop-proof
(dpop-proof-decode
current-time jti-list method full-uri
dpop cnf/jkt #:access-token lit-access-token)))
(let ((subject (access-token-webid access-token))
(issuer (access-token-iss access-token)))
(confirm-provider subject issuer #:http-get http-get)
subject)))
#:unwind? #t))))))
(define (handle-errors f g)
(call/ec
(lambda (do-return)
(define (return . args)
(apply do-return args))
(with-exception-handler
(lambda (error)
(g return error))
(lambda ()
(f return))))))
(define (nonrdf-or-turtle server-uri request request-body)
;; If the request is an exotic RDF serialization
;; format, we want to convert it to Turtle,
;; otherwise we will consider it non-rdf.
(convert '(text/turtle */*)
server-uri
(uri-path (request-uri request))
(request-content-type request)
request-body))
(define (serve-get return path if-match if-none-match content-type content etag headers user)
(define (respond-normal)
(return
(build-response
#:headers headers)
content
user))
(if if-match
;; If the precondition failed, then we should respond with 412
(with-exception-handler
(lambda (error)
(unless (precondition-failed? error)
(raise-exception error))
(return
(build-response
#:code 412
#:reason-phrase "Precondition Failed")
#f
user))
(lambda ()
(check-precondition path if-match if-none-match etag)
(respond-normal)))
;; If the precondition succeeds (if-none-match is effectively
;; invalid), we return 200
(with-exception-handler
(lambda (error)
(unless (precondition-failed? error)
(raise-exception error))
(return
(build-response
#:code 304
#:reason-phrase "Not Modified"
#:headers headers)
#f
user))
(lambda ()
(when if-none-match
(check-precondition path if-match if-none-match etag))
(respond-normal)))))
(define*-public (make-resource-server
#:key
(server-uri #f)
(owner #f)
(authenticator #f)
(current-time current-time)
(http-get http-get))
(unless owner
(error "The owner is not defined."))
(declare-link-header!)
(unless authenticator
(set! authenticator
(make-authenticator (make-jti-list)
#:server-uri server-uri
#:current-time current-time
#:http-get http-get)))
(lambda (request request-body)
(let ((user (authenticator request request-body)))
(handle-errors
(lambda (return)
(let ((method (request-method request)))
(case method
((GET HEAD OPTIONS)
(receive (headers content)
(read server-uri owner user
(uri-path (request-uri request))
#:http-get http-get)
(let ((true-content-type
(car (assq-ref headers 'content-type)))
(other-headers
(filter
(lambda (h)
(not (eq? (car h) 'content-type)))
headers)))
(receive (negociated-content-type
negociated-content)
(convert (request-accept request #f)
server-uri
(uri-path (request-uri request))
true-content-type
content)
(serve-get
return
(uri-path (request-uri request))
(request-if-match request)
(request-if-none-match request)
negociated-content-type
negociated-content
(car (assq-ref headers 'etag))
(cons `(content-type ,negociated-content-type)
other-headers)
user)))))
((PUT)
(receive (content-type content)
(nonrdf-or-turtle server-uri request request-body)
(return
(build-response
#:headers
`((etag . (,(update server-uri owner user
(uri-path (request-uri request))
(request-if-match request)
(request-if-none-match request)
content-type
content
#:http-get http-get)
. #f))))
""
user)))
((POST)
(receive (content-type content)
(nonrdf-or-turtle server-uri request request-body)
(let ((types
(map car
(filter
(lambda (link)
(equal? (assq-ref link 'rel) "type"))
(request-links request)))))
(return
(build-response
#:code 201 #:reason-phrase "Created"
#:headers
`((location . ,(create server-uri owner user
(uri-path (request-uri request))
types
(assq-ref (request-headers request) 'slug)
content-type
content
#:http-get http-get))))
""
user))))
((DELETE)
(delete server-uri owner user
(uri-path (request-uri request))
(request-if-match request)
(request-if-none-match request)
#:http-get http-get)
(return
(build-response)
""
user)))))
(lambda (return error)
(if (cannot-fetch-group? error)
(format (current-error-port) (G_ "Warning: ~a\n")
(error->str error))
(cond
((uri-slash-semantics-error? error)
(return
(build-response
#:code 301
#:reason-phrase "Found"
#:headers
`((location
. ,(build-uri
(uri-scheme server-uri)
#:userinfo (uri-userinfo server-uri)
#:host (uri-host server-uri)
#:port (uri-port server-uri)
#:path (uri-slash-semantics-error-expected-path error)))))
#f
user))
((or (path-not-found? error)
(auxiliary-resource-absent? error)
(forbidden? error))
(if user
;; That’s a forbidden
(return
(build-response #:code 403 #:reason-phrase "Forbidden")
#f
user)
(return
(build-response #:code 401 #:reason-phrase "Unauthorized"
#:headers `((www-authenticate . ((DPoP)))))
#f
user)))
((or (cannot-delete-root? error))
(return
(build-response
#:code 405
#:reason-phrase "Method Not Allowed")
#f
user))
((or (container-not-empty? error)
(incorrect-containment-triples? error)
(path-is-auxiliary? error))
(return
(build-response
#:code 409
#:reason-phrase "Conflict")
#f
user))
((unsupported-media-type? error)
(return
(build-response
#:code 415
#:reason-phrase "Unsupported Media Type")
#f
user))
((precondition-failed? error)
(return
(build-response
#:code 412
#:reason-phrase "Precondition Failed")
#f
user))
((not-acceptable? error)
(return
(build-response
#:code 406
#:reason-phrase "Not Acceptable")
#f
user))
(else
(raise-exception error)))))))))
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