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(define-module (webid-oidc fetch)
#:use-module (webid-oidc errors)
#:use-module (ice-9 optargs)
#:use-module (ice-9 receive)
#:use-module (rnrs bytevectors)
#:use-module (web client)
#:use-module (web request)
#:use-module (web response)
#:use-module (web uri)
#:use-module (turtle tordf))
(define*-public (fetch uri #:key (http-get http-get))
(unless (uri? uri)
(set! uri (string->uri uri)))
(with-exception-handler
(lambda (error)
(raise-cannot-fetch-linked-data uri error))
(lambda ()
(receive (response response-body)
(http-get uri
#:headers `((accept (text/turtle))))
(with-exception-handler
(lambda (error)
(raise-unexpected-response response error))
(lambda ()
(unless (eqv? (response-code response) 200)
(raise-request-failed-unexpectedly (response-code response)
(response-reason-phrase response)))
(let ((content-type (response-content-type response)))
(unless (and content-type
(eq? (car content-type) 'text/turtle)
(or (not (assq-ref (cdr content-type) 'charset))
(equal? (assq-ref (cdr content-type) 'charset) "utf-8")))
(raise-unexpected-header-value 'content-type content-type)))
(when (bytevector? response-body)
(set! response-body (utf8->string response-body)))
(with-exception-handler
(lambda (rdf-error)
(raise-not-turtle response-body rdf-error))
(lambda ()
(turtle->rdf (string-append
"# This is not a file name\n"
response-body)
(uri->string uri))))))))))
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