;; 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 server delete)
  #:use-module (webid-oidc errors)
  #:use-module (webid-oidc server resource path)
  #:use-module (webid-oidc server resource content)
  #:use-module (webid-oidc server precondition)
  #:use-module (webid-oidc cache)
  #:use-module (webid-oidc fetch)
  #:use-module (webid-oidc http-link)
  #: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 (web uri)
  #:use-module (web client)
  #: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 (ice-9 hash-table)
  #:use-module (rnrs bytevectors)
  #:use-module (oop goops)
  #:export
  (

   delete

   ))

(define* (delete server-name owner user path if-match if-none-match
                 #:key
                 (http-get http-get))
  (check-acl-can-write server-name path owner user)
  (with-session
   (lambda (load-content-type load-contained load-static-content
                              do-create do-delete)
     (receive (base-path path-type)
         (base-path path)
       (update-path
        base-path
        (lambda (main-etag auxiliary)
          (let ((relevant-etag
                 (if path-type
                     (assoc-ref auxiliary path-type)
                     main-etag)))
            (check-precondition path if-match if-none-match relevant-etag)
            (if path-type
                ;; Delete an auxiliary resource
                (values
                 main-etag
                 (filter
                  (lambda (auxiliary)
                    (not (equal? (car auxiliary) path-type)))
                  auxiliary))
                ;; Delete the main resource, if it’s not the root and
                ;; it’s not a non-empty container (those things are
                ;; checked by update-path).
                #f)))
        load-content-type load-contained load-static-content do-create do-delete)))))