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;;; Copyright © 2019 - 2022 Jakob L. Kreuze <zerodaysfordays@sdf.org>
;;;
;;; This program 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.
;;;
;;; 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
;;; General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with this program. If not, see
;;; <http://www.gnu.org/licenses/>.
(define-module (dynamic capabilities comments)
#:use-module (dynamic util)
#:use-module (ice-9 match)
#:use-module (json)
#:use-module (squee)
#:use-module (web request)
#:use-module (web response)
#:use-module (web uri)
#:export (get-comments put-comment put-reaction))
(define conn (connect-to-postgres-paramstring "dbname=jakob_comments"))
(define (get-comments-slug slug)
(define (format-comment comment)
(match comment
((id name subject email comment reactions)
`((id . ,id)
(name . ,name)
(subject . ,subject)
(email . ,email)
(comment . ,comment)
(reactions . ,reactions)))))
(let* ((query "SELECT id, name, subject, email, comment, reactions
FROM comments WHERE slug = $1")
(result (exec-query conn query (list (car slug)))))
(values '((content-type . (application/json)))
(scm->json-string
(list->vector
(map format-comment result))))))
(define (get-comments request body)
(let* ((query-string (uri-query (request-uri request)))
(params (if query-string
(decode-form query-string)
'()))
(slug (assoc-ref params "p")))
(if slug
(get-comments-slug slug)
(values (build-response #:code 400)
(scm->json-string
`((success . #f)
(error . "missing `slug' query parameter")))))))
(define (assoc-value alist key)
(let ((result (assoc-ref alist key)))
(if result (car result) result)))
(define (insert-comment form-data)
(exec-query conn
"INSERT INTO comments (submitted, slug, name, subject, email, url, comment)
VALUES (now(), $1, $2, $3, $4, $5, $6);"
(list (assoc-value form-data "slug")
(assoc-value form-data "name")
(assoc-value form-data "subject")
(assoc-value form-data "email")
(assoc-value form-data "url")
(assoc-value form-data "comment")))
(values '((content-type . (text/plain))) "Hello hacker!"))
(define (valid-comment? form-data)
(and (assoc "slug" form-data)
(assoc "name" form-data)
(assoc "comment" form-data)))
(define (put-comment request body)
(let ((form-data (decode-form body)))
(if (valid-comment? form-data)
(insert-comment form-data)
(values (build-response #:code 400)
(scm->json-string
`((success . #f)
(error . "missing `slug', `name', or `comment'")))))))
(define (comment-reactions id)
(let* ((query "SELECT reactions FROM comments WHERE id = $1")
(result (exec-query conn query (list id))))
;; It could be NULL, in which case we want the empty list instead.
(if (positive? (length result)) (or (caar result) "()") #f)))
(define (acons-normalize key value alist)
(cons (cons key value)
(filter (lambda (pair) (not (equal? (car pair) key))) alist)))
(define (add-reaction reactions reaction)
(with-output-to-string
(lambda ()
(let ((parsed (call-with-input-string reactions read)))
(write (acons-normalize reaction
(if (assoc reaction parsed) (+ 1 (assoc-value parsed reaction)) 1)
parsed))))))
(define (set-reactions id reactions)
(exec-query conn
"UPDATE comments SET reactions = $1 WHERE id = $2"
(list reactions id))
(values '((content-type . (text/plain))) "Reacted hacker!"))
;; TODO: Need to validate `form-data' first.
(define (put-reaction request body)
(let* ((form-data (decode-form body))
(id (assoc-value form-data "id"))
(reaction (assoc-value form-data "reaction"))
(reactions (comment-reactions id)))
(if reactions
(set-reactions id (add-reaction reactions reaction))
(values (build-response #:code 400)
(scm->json-string
`((success . #f)
(error . "no such comment")))))))
;; (define (make-challenge request body)
;; (let-values (((uuid value image) (new-captcha)))
;; (hash-set! challenges uuid value)
;; (hash-for-each (lambda (x y) (display x) (newline)) challenges)
;; (values `((content-type . (application/base64))
;; (access-control-allow-origin . "*")
;; (x-captcha-id . ,uuid))
;; (base64-encode image))))
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