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;;; Guix Data Service -- Information about Guix over time
;;; Copyright © 2016, 2017 Ricardo Wurmus <rekado@elephly.net>
;;; Copyright © 2014 David Thompson <davet@gnu.org>
;;; Copyright © 2019 Christopher Baines <mail@cbaines.net>
;;;
;;; 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-data-service web util)
#:use-module (ice-9 match)
#:use-module (srfi srfi-1)
#:use-module (web request)
#:use-module (web uri)
#:export (most-appropriate-mime-type
request->path-components-and-mime-type
file-extension
directory?
hyphenate-words
underscore-join-words))
(define (most-appropriate-mime-type accepted-mime-types
supported-mime-types)
(or
;; Pick the first supported mime-type
(find (lambda (accepted-mime-type)
(memq accepted-mime-type
supported-mime-types))
accepted-mime-types)
;; Default to the first supported mime-type if none are accepted
(first supported-mime-types)))
(define (request->path-components-and-mime-type request)
(define extensions-to-mime-types
'(("json" . application/json)
("html" . text/html)))
(define (ends-with-recognised-extension? path)
(any (lambda (extension)
(string-suffix? (string-append "." extension)
path))
(map car extensions-to-mime-types)))
(match (split-and-decode-uri-path (uri-path (request-uri request)))
(()
(values '()
(or (request-accept request)
(list 'text/html))))
((single-component)
(if (ends-with-recognised-extension? single-component)
(match (string-split single-component #\.)
((first-parts ... extension)
(values (list (string-join first-parts "."))
(or (cons
(assoc-ref extensions-to-mime-types extension)
(or (request-accept request)
(list 'text/html)))))))
(values (list single-component)
(or (request-accept request)
(list 'text/html)))))
((first-components ... last-component)
(if (ends-with-recognised-extension? last-component)
(match (string-split last-component #\.)
((first-parts ... extension)
(values (append first-components
(list (string-join first-parts ".")))
(or (cons
(assoc-ref extensions-to-mime-types extension)
(or (request-accept request)
(list 'text/html)))))))
(values (append first-components
(list last-component))
(or (request-accept request)
(list 'text/html)))))))
(define (file-extension file-name)
(last (string-split file-name #\.)))
(define (directory? filename)
(string=? filename (dirname filename)))
(define (hyphenate-words words)
(string-join
(string-split words #\space)
"-"))
(define (underscore-join-words words)
(string-join
(string-split words #\space)
"_"))
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