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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 query-parameters)
#:use-module (guix-data-service web util)
#:use-module (ice-9 match)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-9 gnu)
#:use-module (srfi srfi-19)
#:use-module (web request)
#:use-module (web uri)
#:export (parse-query-string
<invalid-query-parameter>
make-invalid-query-parameter
invalid-query-parameter?
invalid-query-parameter-value
invalid-query-parameter-message
any-invalid-query-parameters?
parse-query-parameters
parse-datetime
parse-result-limit))
(define (parse-query-string query)
"Parse and decode the URI query string QUERY and return an alist."
(let lp ((lst (map uri-decode (string-split query (char-set #\& #\=)))))
(match lst
((key value . rest)
(cons (cons key value) (lp rest)))
(() '()))))
(define-immutable-record-type <invalid-query-parameter>
(make-invalid-query-parameter value message)
invalid-query-parameter?
(value invalid-query-parameter-value)
(message invalid-query-parameter-message))
(define (parse-query-parameters request
accepted-query-parameters)
(define request-query-parameters
(let ((query (uri-query (request-uri request))))
(if query
(map (match-lambda
((name . value)
(cons (string->symbol name)
value)))
(parse-query-string query))
'())))
(filter-map
(match-lambda
((name processor)
(match (assq name request-query-parameters)
(#f #f)
((_ . "") #f)
((_ . value) (cons name
(processor value)))))
((name processor #:default default)
(match (assq name request-query-parameters)
(#f (cons name default))
((_ . "") (cons name default))
((_ . value) (cons name
(processor value))))))
accepted-query-parameters))
(define (parse-datetime s)
(catch
'misc-error
(lambda ()
(string->date s "~Y-~m-~d ~H:~M:~S"))
(lambda (key . args)
(make-invalid-query-parameter s #f))))
(define (parse-result-limit s)
(match (string->number s)
(#f (make-invalid-query-parameter s #f))
((? number? num) num)))
(define (any-invalid-query-parameters? query-parameters)
(->bool (any invalid-query-parameter? (map cdr query-parameters))))
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