;;; GNU Guix --- Functional package management for GNU ;;; Copyright © 2014 David Thompson <davet@gnu.org> ;;; Copyright © 2015, 2016 Eric Bavier <bavier@member.fsf.org> ;;; Copyright © 2018 Ludovic Courtès <ludo@gnu.org> ;;; ;;; This file is part of GNU Guix. ;;; ;;; GNU Guix is free software; you can redistribute it and/or modify it ;;; under the terms of the GNU General Public License as published by ;;; the Free Software Foundation; either version 3 of the License, or (at ;;; your option) any later version. ;;; ;;; GNU Guix 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 General Public License for more details. ;;; ;;; You should have received a copy of the GNU General Public License ;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>. (define-module (guix import json) #:use-module (json) #:use-module (guix http-client) #:use-module (guix import utils) #:use-module (srfi srfi-34) #:export (json-fetch json-fetch-alist)) (define* (json-fetch url ;; Note: many websites returns 403 if we omit a ;; 'User-Agent' header. #:key (headers `((user-agent . "GNU Guile") (Accept . "application/json")))) "Return a representation of the JSON resource URL (a list or hash table), or #f if URL returns 403 or 404. HEADERS is a list of HTTP headers to pass in the query." (guard (c ((and (http-get-error? c) (let ((error (http-get-error-code c))) (or (= 403 error) (= 404 error)))) #f)) (let* ((port (http-fetch url #:headers headers)) (result (json->scm port))) (close-port port) result))) (define (json-fetch-alist url) "Return an alist representation of the JSON resource URL, or #f if URL returns 403 or 404." (and=> (json-fetch url) hash-table->alist))