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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
guard-against-mutually-exclusive-query-parameters
query-parameters->string
parse-datetime
parse-checkbox-value
parse-number
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 (guard-against-mutually-exclusive-query-parameters
parsed-query-parameters
mutually-exclusive-groups)
(map (match-lambda
((name . value)
(if (invalid-query-parameter? value)
(cons name value)
(or
(any (lambda (group)
(if (memq name group)
(let ((other-names
(filter (lambda (other-name)
(and (not (eq? name other-name))
(memq other-name group)))
(map car parsed-query-parameters))))
(if (not (null? other-names))
(cons
name
(make-invalid-query-parameter
value
(string-append
"cannot be specified along with "
(string-join (map symbol->string
other-names)
", "))))
#f))
#f))
mutually-exclusive-groups)
(cons name value)))))
parsed-query-parameters))
(define (parse-query-parameters request
accepted-query-parameters)
(define request-query-parameters
(let ((query (uri-query (request-uri request))))
(if (and query
(not (string-null? 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 #:required)
(match (assq name request-query-parameters)
(#f (cons name
(make-invalid-query-parameter
#f "this value is required.")))
((_ . "") (cons name
(make-invalid-query-parameter
#f "this value is required.")))
((_ . value) (cons name
(processor value)))))
((name processor #:multi-value)
(match (filter-map
(match-lambda
((k . value)
(and
(eq? k name)
(match value
(#f #f)
("" #f)
(value (processor value))))))
request-query-parameters)
(() #f)
(x (cons name x))))
((name processor #:multi-value #:default default)
(match (filter-map
(match-lambda
((k . value)
(and
(eq? k name)
(match value
(#f #f)
("" #f)
(value (processor value))))))
request-query-parameters)
(() (cons name default))
(x (cons name x))))
((name processor #:no-default-when fields #:default default)
(let ((use-default?
(every (lambda (field)
(not (memq field fields)))
(map car request-query-parameters))))
(match (assq name request-query-parameters)
(#f (if use-default?
(cons name default)
#f))
((_ . "") (if use-default?
(cons name default)
#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 (query-parameters->string query-parameters)
(define (value->text value)
(match value
(#f "")
(#t "on")
((? date? date)
(date->string date "~1 ~3"))
(other other)))
(string-join
(concatenate
(map
(match-lambda
((key . ($ <invalid-query-parameter>))
'())
((key . value)
(if (list? value)
(map (lambda (value)
(simple-format #f "~A=~A"
key (value->text value)))
value)
(list (simple-format
#f "~A=~A"
key (value->text value))))))
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-checkbox-value s)
(string=? s "on"))
(define (parse-number s)
(match (string->number s)
(#f (make-invalid-query-parameter s #f))
((? number? num) num)))
(define parse-result-limit parse-number)
(define (any-invalid-query-parameters? query-parameters)
(->bool (any invalid-query-parameter? (map cdr query-parameters))))
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