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(define-module (webid-oidc server resource path)
#:use-module (webid-oidc errors)
#: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 (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 (rnrs bytevectors)
#:use-module (oop goops)
#:export
(
read-path
update-path
))
(define (default-dir)
(string-append (refresh:default-dir) "/server"))
(define (hash-path path)
(let ((h (stubs:hash 'SHA-256 path))
(dir (default-dir)))
(let ((first-char (substring h 0 1))
(rest (substring h 1)))
(format #f "~a/path/~a/~a" dir first-char rest))))
(define (read-path path)
(let ((h (hash-path path)))
(with-exception-handler
(lambda (error)
(let ((with-slash (string-append path "/"))
(without-slash
(if (string-suffix? "/" path)
(substring path 0 (- (string-length path) (string-length "/")))
path)))
(let ((with-slash-exists (file-exists? (hash-path with-slash)))
(without-slash-exists (file-exists? (hash-path without-slash))))
(cond
(with-slash-exists
(raise-exception
(make-exception
(make-path-not-found path)
(make-uri-slash-semantics-error path with-slash))))
(without-slash-exists
(raise-exception
(make-exception
(make-path-not-found path)
(make-uri-slash-semantics-error path with-slash))))
(else
(raise-exception (make-path-not-found path)))))))
(lambda ()
(call-with-input-file h
(lambda (port)
(let ((main-etag (read port)))
(let ((auxiliary (read port)))
(values main-etag
(map (lambda (cell)
(let ((key (string->uri (car cell)))
(value (string->uri (cdr cell))))
(cons key value)))
auxiliary))))))))))
(define* (update-path path f content-type contained static-content create delete
#:key (create-intermediate-containers? #f))
(let ((h (hash-path path))
(garbage (make-hash-table))
(has-been-created? #f)
(has-been-deleted? #f)
(parent-path
(let ((components (split-and-decode-uri-path path)))
(cond
((null? components)
#f)
((null? (cdr components))
"/")
(else
(string-append
"/"
(encode-and-join-uri-path
(reverse
(cdr
(reverse components))))
"/"))))))
(stubs:atomically-update-file
h
(lambda (port)
(receive (etag auxiliary)
(with-exception-handler
(lambda (error)
(unless (path-not-found? error)
(raise-exception error))
(set! has-been-created? #t)
(values #f #f))
(lambda ()
(read-path path))
#:unwind? #t
#:unwind-for-type &path-not-found)
(when etag
(hash-set! garbage etag #t))
(when auxiliary
(for-each
(lambda (cell)
(when (cdr cell)
(hash-set! garbage (cdr cell) #t)))
auxiliary))
(call-with-values
(lambda ()
(f etag auxiliary))
(case-lambda
((false)
(when false
(error "You’re using the API wrong."))
;; Delete the resource
(unless (null? (contained etag))
(raise-exception (make-container-not-empty path)))
(when (equal? path "/")
(raise-exception (make-cannot-delete-root)))
(set! has-been-deleted? #t)
#f)
((new-etag new-auxiliary)
(unless (and (string? new-etag) (list? new-auxiliary))
(error "You’re using the API wrong."))
(hash-remove! garbage new-etag)
(when new-auxiliary
(for-each
(lambda (cell)
(hash-remove! garbage (cdr cell)))
new-auxiliary))
(write new-etag port)
(write (map (lambda (cell)
(cons (uri->string (car cell))
(cdr cell)))
new-auxiliary)
port)
#t))))))
(when (and parent-path has-been-created? (not has-been-deleted?))
(update-path
parent-path
(lambda (etag auxiliary)
;; Add path as a child of the resource at etag
(unless create-intermediate-containers?
(unless etag
;; Typically, POST to a non-existing path
(raise-exception (make-path-not-found parent-path))))
(unless auxiliary
(set! auxiliary '()))
(let ((content-type (if etag (content-type etag) 'text/turtle))
(other-children (if etag (contained etag) '()))
(static-content (if etag (static-content etag) (string->utf8 ""))))
(unless (eq? content-type 'text/turtle)
(raise-exception (make-not-a-container parent-path content-type)))
(let ((new-etag
(create content-type (cons path other-children) static-content)))
(values new-etag auxiliary))))
content-type contained static-content create delete
#:create-intermediate-containers? create-intermediate-containers?))
(when (and parent-path has-been-deleted? (not has-been-created?))
(update-path
parent-path
(lambda (etag auxiliary)
(unless etag
(raise-exception (make-path-not-found parent-path)))
(let ((content-type (content-type etag))
(all-children (contained etag))
(static-content (static-content etag)))
(values
(create content-type
(filter (lambda (x)
(not (equal? x path)))
all-children)
static-content)
auxiliary)))
content-type contained static-content create delete
#:create-intermediate-containers? create-intermediate-containers?))
(for-each
delete
(hash-map->list (lambda (garbage false) garbage) garbage))))
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