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d13a7187af
Previously, it wouldn't pull the mime types out of the request properly, I think it does a better job of that now.
106 lines
3.8 KiB
Scheme
106 lines
3.8 KiB
Scheme
;;; Guix Data Service -- Information about Guix over time
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;;; Copyright © 2016, 2017 Ricardo Wurmus <rekado@elephly.net>
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;;; Copyright © 2014 David Thompson <davet@gnu.org>
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;;; Copyright © 2019 Christopher Baines <mail@cbaines.net>
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;;;
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;;; This program is free software: you can redistribute it and/or
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;;; modify it under the terms of the GNU Affero General Public License
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;;; as published by the Free Software Foundation, either version 3 of
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;;; the License, or (at your option) any later version.
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;;;
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;;; This program is distributed in the hope that it will be useful,
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;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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;;; Affero General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU Affero General Public
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;;; License along with this program. If not, see
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;;; <http://www.gnu.org/licenses/>.
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(define-module (guix-data-service web util)
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#:use-module (ice-9 match)
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#:use-module (srfi srfi-1)
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#:use-module (web request)
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#:use-module (web uri)
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#:export (most-appropriate-mime-type
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request->path-components-and-mime-type
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file-extension
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directory?
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hyphenate-words
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underscore-join-words))
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(define (most-appropriate-mime-type accepted-mime-types
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supported-mime-types)
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(or
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;; Pick the first supported mime-type
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(find (lambda (accepted-mime-type)
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(memq accepted-mime-type
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supported-mime-types))
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accepted-mime-types)
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;; Default to the first supported mime-type if none are accepted
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(first supported-mime-types)))
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(define (request->path-components-and-mime-type request)
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(define extensions-to-mime-types
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'(("json" . application/json)
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("html" . text/html)
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("txt" . text/plain)))
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(define (ends-with-recognised-extension? path)
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(any (lambda (extension)
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(string-suffix? (string-append "." extension)
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path))
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(map car extensions-to-mime-types)))
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(define accept-mime-types
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(map car (request-accept request)))
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(match (split-and-decode-uri-path (uri-path (request-uri request)))
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(()
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(values '()
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(or accept-mime-types
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(list 'text/html))))
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((single-component)
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(if (ends-with-recognised-extension? single-component)
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(match (string-split single-component #\.)
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((first-parts ... extension)
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(values (list (string-join first-parts "."))
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(or (cons
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(assoc-ref extensions-to-mime-types extension)
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(or accept-mime-types
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(list 'text/html)))))))
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(values (list single-component)
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(or accept-mime-types
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(list 'text/html)))))
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((first-components ... last-component)
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(if (ends-with-recognised-extension? last-component)
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(match (string-split last-component #\.)
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((first-parts ... extension)
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(values (append first-components
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(list (string-join first-parts ".")))
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(or (cons
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(assoc-ref extensions-to-mime-types extension)
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(or accept-mime-types
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(list 'text/html)))))))
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(values (append first-components
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(list last-component))
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(or accept-mime-types
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(list 'text/html)))))))
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(define (file-extension file-name)
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(last (string-split file-name #\.)))
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(define (directory? filename)
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(string=? filename (dirname filename)))
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(define (hyphenate-words words)
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(string-join
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(string-split words #\space)
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"-"))
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(define (underscore-join-words words)
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(string-join
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(string-split words #\space)
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"_"))
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