128 lines
4.4 KiB
Scheme
128 lines
4.4 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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;; This code was snarfed from David Thompson's guix-web.
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(define-module (guix-data-service web render)
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#:use-module (srfi srfi-1)
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#:use-module (srfi srfi-19)
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#:use-module (srfi srfi-26)
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#:use-module (ice-9 binary-ports)
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#:use-module (web request)
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#:use-module (web response)
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#:use-module (web uri)
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#:use-module (json)
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#:use-module (guix-data-service config)
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#:use-module (guix-data-service web sxml)
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#:use-module (guix-data-service web util)
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#:export (render-static-asset
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render-html
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render-json
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not-found
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unprocessable-entity
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created
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redirect))
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(define file-mime-types
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'(("css" . (text/css))
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("js" . (text/javascript))
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("svg" . (image/svg+xml))
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("png" . (image/png))
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("gif" . (image/gif))
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("woff" . (application/font-woff))
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("ttf" . (application/octet-stream))
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("html" . (text/html))))
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(define (render-static-asset request)
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(render-static-file (%config 'assets-dir) request))
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(define %not-slash
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(char-set-complement (char-set #\/)))
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(define (render-static-file root request)
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(define path
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(uri-path (request-uri request)))
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(define failure
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(not-found (build-uri 'http
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#:host (%config 'host)
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#:port (%config 'port)
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#:path path)))
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(let ((file-name (string-append root "/" path)))
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(if (not (any (cut string-contains <> "..")
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(string-tokenize path %not-slash)))
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(let* ((stat (stat file-name #f))
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(modified (and stat
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(make-time time-utc 0 (stat:mtime stat)))))
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(define (send-file)
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(list `((content-type
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. ,(assoc-ref file-mime-types
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(file-extension file-name)))
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(last-modified . ,(time-utc->date modified)))
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(call-with-input-file file-name get-bytevector-all)))
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(if (and stat (not (eq? 'directory (stat:type stat))))
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(cond ((assoc-ref (request-headers request) 'if-modified-since)
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=>
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(lambda (client-date)
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(if (time>? modified (date->time-utc client-date))
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(send-file)
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(list (build-response #:code 304) ;"Not Modified"
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#f))))
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(else
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(send-file)))
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failure))
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failure)))
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(define* (render-html #:key sxml (extra-headers '()))
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(list (append extra-headers
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'((content-type . (text/html))))
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(lambda (port)
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(sxml->html sxml port))))
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(define (render-json json)
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(list '((content-type . (application/json)))
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(lambda (port)
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(scm->json json port))))
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(define (not-found uri)
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(list (build-response #:code 404)
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(string-append "Resource not found: " (uri->string uri))))
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(define (unprocessable-entity)
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(list (build-response #:code 422)
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""))
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(define (created)
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(list (build-response #:code 201)
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""))
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(define (redirect path)
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(let ((uri (build-uri 'http
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#:host (%config 'host)
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#:port (%config 'port)
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#:path (string-append
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"/" (encode-and-join-uri-path path)))))
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(list (build-response
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#:code 301
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#:headers `((content-type . (text/html))
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(location . ,uri)))
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(format #f "Redirect to ~a" (uri->string uri)))))
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