1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
|
;;; 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/>.
;; This code was snarfed from David Thompson's guix-web.
(define-module (guix-data-service web render)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-19)
#:use-module (srfi srfi-26)
#:use-module (ice-9 ftw)
#:use-module (ice-9 iconv)
#:use-module (ice-9 binary-ports)
#:use-module (web request)
#:use-module (web response)
#:use-module (web uri)
#:use-module (json)
#:use-module (guix-data-service config)
#:use-module (guix-data-service web sxml)
#:use-module (guix-data-service web util)
#:export (static-asset-from-store-renderer
render-static-asset
render-html
render-json
render-text
not-found
unprocessable-entity
created
no-content
redirect))
(define file-mime-types
'(("css" . (text/css))
("js" . (text/javascript))
("svg" . (image/svg+xml))
("png" . (image/png))
("gif" . (image/gif))
("woff" . (application/font-woff))
("ttf" . (application/octet-stream))
("html" . (text/html))))
(define (static-asset-from-store-renderer)
(define last-modified
;; Use the process start time as the last modified time, as the file
;; metadata in the store is normalised.
(current-time))
(define files
(file-system-fold
(const #t) ; enter
(lambda (filename stat result)
(let ((relative-filename (string-drop filename
(+ 1 ; to account for the /
(string-length
(%config 'assets-dir))))))
(cons (cons relative-filename
(call-with-input-file filename
get-bytevector-all))
result)))
(lambda (name stat result) result) ; down
(lambda (name stat result) result) ; up
(lambda (name stat result) result) ; skip
(lambda (name stat errno result)
(error name))
'()
(%config 'assets-dir)))
(define (send-file path contents)
(list `((content-type
. ,(assoc-ref file-mime-types
(file-extension path)))
(last-modified . ,(time-utc->date last-modified))
(cache-control . (public
;; Set the max-age at 5 minutes, as the files
;; could change when the code changes
(max-age . ,(* 60 5)))))
contents))
(lambda (path headers)
(and=> (assoc-ref files path)
(lambda (contents)
(cond ((assoc-ref headers 'if-modified-since)
=>
(lambda (client-date)
(if (time>? last-modified
(date->time-utc client-date))
(send-file path contents)
(list (build-response #:code 304) ; "Not Modified"
#f))))
(else
(send-file path contents)))))))
(define (render-static-asset path headers)
(render-static-file (%config 'assets-dir) path headers))
(define %not-slash
(char-set-complement (char-set #\/)))
(define (render-static-file root path headers)
(let ((file-name (string-append root "/" path)))
(if (not (any (cut string-contains <> "..")
(string-tokenize path %not-slash)))
(let* ((stat (stat file-name #f))
(modified (and stat
(make-time time-utc 0 (stat:mtime stat)))))
(define (send-file)
(list `((content-type
. ,(assoc-ref file-mime-types
(file-extension file-name)))
(last-modified . ,(time-utc->date modified)))
(call-with-input-file file-name get-bytevector-all)))
(if (and stat (not (eq? 'directory (stat:type stat))))
(cond ((assoc-ref headers 'if-modified-since)
=>
(lambda (client-date)
(if (time>? modified (date->time-utc client-date))
(send-file)
(list (build-response #:code 304) ;"Not Modified"
#f))))
(else
(send-file)))
#f))
#f)))
(define* (render-html #:key sxml (extra-headers '())
(code 200))
(list (build-response
#:code code
#:headers (append extra-headers
'((content-type . (text/html
(charset . "utf-8")))
(vary . (accept)))))
(call-with-encoded-output-string
"utf-8"
(lambda (port)
(sxml->html sxml port)))))
(define* (render-json json #:key (extra-headers '())
(code 200))
(list (build-response
#:code code
#:headers (append extra-headers
'((content-type . (application/json
(charset . "utf-8")))
(vary . (accept)))))
(call-with-encoded-output-string
"utf-8"
(lambda (port)
(scm->json json port)))))
(define* (render-text text #:key (extra-headers '())
(code 200))
(list (build-response
#:code code
#:headers (append extra-headers
'((content-type . (text/plain
(charset . "utf-8")))
(vary . (accept)))))
(call-with-encoded-output-string
"utf-8"
(lambda (port)
(display text 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 (no-content)
(list (build-response #:code 204)
""))
(define (redirect path)
(let ((uri (build-uri 'http
#:host (%config 'host)
#:port (%config '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)))))
|