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;;; mumi -- Mediocre, uh, mail interface
;;; Copyright © 2016, 2017, 2020 Ricardo Wurmus <rekado@elephly.net>
;;; 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/>.
;; This code was snarfed from David Thompson's guix-web.
(define-module (mumi web render)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-2)
#:use-module (srfi srfi-19)
#:use-module (srfi srfi-26)
#:use-module (ice-9 binary-ports)
#:use-module ((ice-9 textual-ports)
#:select (get-string-all put-string))
#:use-module (ice-9 match)
#:use-module (web http)
#:use-module (web request)
#:use-module (web response)
#:use-module (web uri)
#:use-module (webutils multipart)
#:use-module (json)
#:use-module (mumi config)
#:use-module (mumi web sxml)
#:use-module (mumi web util)
#:export (render-static-asset
render-html
render-json
not-found
unprocessable-entity
created
redirect
parse-form-submission))
(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 (render-static-asset request)
(render-static-file (%config 'assets-dir) request))
(define %not-slash
(char-set-complement (char-set #\/)))
(define (render-static-file root request)
(define path
(uri-path (request-uri request)))
(define failure
(not-found (build-uri 'http
#:host (%config 'host)
#:port (%config 'port)
#:path path)))
(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 (request-headers request) '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)))
failure))
failure)))
(define* (render-html sxml #:key (extra-headers '()))
(list (append extra-headers
'((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)
""))
;; We need to override the writer for Location header values, because
;; write-uri drops the fragment. Since we want to be able to redirect
;; to URLs with a fragment to jump to an anchor we need to replace the
;; header definition.
(define (write-uri* uri port)
(put-string port (uri->string uri #:include-fragment? #true)))
(declare-header! "Location"
(lambda (str)
(or (string->uri-reference str)
(throw 'bad-header-component 'uri-reference str)))
uri-reference?
write-uri*)
(define* (redirect path #:key query fragment (headers '()))
(let ((uri (build-relative-ref
#:path (string-append
"/" (encode-and-join-uri-path path))
#:query query
#:fragment fragment)))
(list (build-response
#:code 302
#:headers (append `((content-type . (text/html))
(location . ,uri))
headers))
(format #f "Redirect to ~a" (uri->string uri)))))
(define (parse-form-submission request body)
"Return an alist with keys to values for the submitted form."
(let ((parts (parse-request-body request body)))
(map (lambda (part)
(let ((binary? (match (assoc-ref (part-headers part) 'content-type)
(('application/octet-stream . _) #t)
(_ #f))))
(and-let*
((content (assoc-ref (part-headers part) 'content-disposition))
(form-data (and=> (memq 'form-data content) cadr))
(name (and=> (memq 'name form-data) cdr)))
(cons (string->symbol name)
((if binary? get-bytevector-all get-string-all)
(part-body part))))))
parts)))
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