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;;; guix-web - Web interface for GNU Guix
;;; Copyright © 2014 David Thompson <davet@gnu.org>
;;;
;;; 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
;;; <http://www.gnu.org/licenses/>.
(define-module (guix web render)
#:use-module (ice-9 binary-ports)
#:use-module (web response)
#:use-module (web uri)
#:use-module (guix web sxml)
#:use-module (json)
#:use-module (guix web config)
#:use-module (guix web util)
#:export (render-static-asset
render-html
render-json
not-found
unprocessable-entity
created
redirect))
(define file-mime-types
'(("css" . (text/css))
("js" . (text/javascript))
("png" . (image/png))))
(define (render-static-asset path)
(let ((file-name (string-join (cons* guix-web-asset-dir path) "/")))
(if (and (file-exists? file-name)
(not (directory? file-name)))
(list `((content-type . ,(assoc-ref file-mime-types
(file-extension file-name))))
(call-with-input-file file-name get-bytevector-all))
(not-found (build-uri 'http
#:host guix-web-host
#:port guix-web-port
#:path (string-join path "/" 'prefix))))))
(define (render-html sxml)
(list '((content-type . (text/html)))
(lambda (port)
(sxml->html sxml port))))
(define (render-json json)
(list '((content-type . (application/json)))
(lambda (port)
(scm->json json port))))
(define (not-found uri)
(list (build-response #:code 404)
(string-append "Resource not found: " (uri->string uri))))
(define (unprocessable-entity)
(list (build-response #:code 422)
""))
(define (created)
(list (build-response #:code 201)
""))
(define (redirect path)
(let ((uri (build-uri 'http
#:host guix-web-host
#:port guix-web-port
#:path (string-append
"/" (encode-and-join-uri-path path)))))
(list (build-response
#:code 301
#:headers `((content-type . (text/html))
(location . ,uri)))
(format #f "Redirect to ~a" (uri->string uri)))))
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