Restructure the client API

The client API had several problems:
- using records instead of GOOPS means that we aren’t flexible enough
to introduce accounts protected by a password, for a multi-user
application;
- saving the user database to disk means we can’t have a proper
immutable API;
- it was difficult to predict when the users database would change,
and inform the user interface about this change;
- it had two different ways to negociate an access token, one when we
had a refresh token and one when we did not;
- it was supposed to either use account objects or a subject / issuer
pair, now we only use account objects.

1 files changed, 92 insertions, 0 deletions

diff --git a/src/scm/webid-oidc/client/client.scm b/src/scm/webid-oidc/client/client.scm
new file mode 100644
index 0000000..66f8b74
--- /dev/null
+++ b/src/scm/webid-oidc/client/client.scm
@@ -0,0 +1,92 @@
+;; disfluid, implementation of the Solid specification
+;; Copyright (C) 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 client)
+  #:use-module (webid-oidc errors)
+  #:use-module (webid-oidc provider-confirmation)
+  #:use-module (webid-oidc oidc-configuration)
+  #:use-module (webid-oidc oidc-id-token)
+  #:use-module (webid-oidc dpop-proof)
+  #:use-module (webid-oidc web-i18n)
+  #:use-module ((webid-oidc jwk) #:prefix jwk:)
+  #:use-module ((webid-oidc parameters) #:prefix p:)
+  #:use-module ((webid-oidc stubs) #:prefix stubs:)
+  #:use-module ((webid-oidc config) #:prefix cfg:)
+  #:use-module ((webid-oidc client accounts) #:prefix client:)
+  #:use-module (web uri)
+  #:use-module (web client)
+  #:use-module (web request)
+  #:use-module (web response)
+  #:use-module (web server)
+  #:use-module (web http)
+  #:use-module (ice-9 optargs)
+  #:use-module (ice-9 receive)
+  #:use-module (srfi srfi-9)
+  #:use-module (srfi srfi-19)
+  #:use-module (srfi srfi-26)
+  #:use-module (rnrs bytevectors)
+  #:use-module (ice-9 i18n)
+  #:use-module (ice-9 getopt-long)
+  #:use-module (ice-9 suspendable-ports)
+  #:use-module (ice-9 match)
+  #:use-module (sxml simple)
+  #:use-module (oop goops)
+  #:export
+  (
+   <client>
+   client-id
+   client-key-pair
+   client-redirect-uri
+
+   client
+   )
+  #:declarative? #t)
+
+(define-class <client> ()
+  (client-id #:init-keyword #:client-id #:getter client-id)
+  (key-pair #:init-keyword #:key-pair #:getter client-key-pair)
+  (redirect-uri #:init-keyword #:redirect-uri #:getter client-redirect-uri))
+
+(define-method (initialize (client <client>) initargs)
+  (next-method)
+  (let-keywords
+   initargs #t
+   ((client-id #f)
+    (key-pair #t) ;; We’ll generate one if not #f
+    (redirect-uri #f))
+   (let convert-args ((client-id client-id)
+                      (key-pair key-pair)
+                      (redirect-uri redirect-uri))
+     (match `(,client-id ,key-pair ,redirect-uri)
+       (((or (? string? (= string->uri (? uri? client-id)))
+             (? uri? client-id))
+         (? jwk:jwk? client-key)
+         (or (? string? (= string->uri (? uri? redirect-uri)))
+             (? uri? redirect-uri)))
+        (begin
+          (slot-set! client 'client-id client-id)
+          (slot-set! client 'key-pair client-key)
+          (slot-set! client 'redirect-uri redirect-uri)))
+       ((_ #t _)
+        (convert-args client-id (jwk:generate-key #:n-size 2048) redirect-uri))
+       (else
+        (scm-error 'wrong-type-arg "make <account>"
+                   (G_ "Client ID and redirect URIs should be URIs, and key pair should be a key pair..")
+                   '()
+                   (list client-id key-pair redirect-uri)))))))
+
+(define client
+  (make-parameter #f))