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#!/bin/sh
# -*- scheme -*-
exec guile -L $(pwd) -e '(@ (web) main)' -s "$0" "$@"
!#
;;; Copyright © 2014 David Thompson <davet@gnu.org>
;;; Copyright © 2015-2017 Amirouche Boubekki <amirouche@hypermove.net>
;;
;; 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 (web))
;; stdlib
(use-modules ((ice-9 binary-ports)))
(use-modules ((ice-9 match)))
(use-modules ((ice-9 threads)))
(use-modules ((rnrs bytevectors)))
(use-modules ((web request)))
(use-modules ((web uri)))
;; third party
(use-modules ((web server)))
(use-modules ((wiredtiger extra)))
(use-modules ((wiredtiger feature-space)))
(use-modules ((wiredtiger wiredtiger)))
;; local
(use-modules ((web decode)))
(use-modules ((web helpers)))
(use-modules ((web html)))
(use-modules ((web mime-types)))
(use-modules ((web static)))
(use-modules ((sha-2)))
;; gnunet
(use-modules ((gnunet sync)))
(setlocale LC_ALL "")
(define %configuration #f)
(define %home #f)
;;; helpers
(define (make-hash bv)
(let ((hash (make-sha-512)))
(sha-512-update! hash bv)
(sha-512-finish! hash)
(sha-512->string hash)))
;;;
(define (maybe-message-add! body uri)
(when (null? (fs:find 'uri uri))
(fs:add! `((kind . message) (body . ,body)))))
(define (discover configuration)
(let loop ((uris (search configuration '("c3b2://v1/message"))))
(unless (null? uris)
(let ((body (download configuration (car uris))))
(when body
(pk 'add (car uris))
(maybe-message-add! (utf8->string body) (car uris)))
(loop (cdr uris))))))
(define (run-discovery configuration)
"Run a background thread to look for new messages"
(call-with-new-thread
(lambda ()
(with-context*
(let loop ()
(discover configuration)
(loop)
(sleep 1))))))
;;;
(define (c3b2/topics)
(map (lambda (x) (assoc-ref x 'body))
(map fs:ref*
(fs:find 'kind 'message))))
(define (c3b2/topic-add! body)
(let* ((payload (string->utf8 body))
(hash (make-hash payload))
(filepath (string-append %home "/" hash)))
(call-with-output-file filepath
(lambda (port)
(put-bytevector port payload))
#:binary #t)
(publish %configuration (pk filepath) '("c3b2://v1/message"))))
;;; web
(define (template body-class body)
`((doctype "html")
(html
(head
(meta (@ (charset "utf-8")))
(title "c3b2")
(link (@ (rel "stylesheet") (href "/static/normalize.css")))
(link (@ (rel "stylesheet") (href "/static/main.css"))))
(body
(div (h1 (a (@ (href "/")) "c3b2")))
,body))))
(define (template/topic topic)
`(div (p ,topic)))
(define (template/index topics)
`(,(map template/topic topics)
(hr)
(form (@ (method "POST")
(action "/"))
(h2 "Chime in the conversation!")
(textarea (@ (name "body")))
(input (@ (type "submit")
(value "publish"))))))
(define (route/index/get)
(render-html (template "index" (template/index (c3b2/topics)))))
(define (route/index/post body)
(c3b2/topic-add! (car (assoc-ref (decode body) "body")))
(redirect "/"))
(define (router request body)
(with-context*
(match (cons (request-method request) (request-path-components request))
(('GET) (route/index/get))
(('POST) (route/index/post body))
(('GET "static" path ...) (render-static-asset path))
(_ (not-found (uri->string (request-uri request)))))))
(define-public (main args)
(set! %configuration (cadr args))
(set! %home (caddr args))
(format #t "Server running @ http://localhost:8080\n")
(with-env (env-open* "wt" (list *feature-space*) "create,log=(enabled=true)")
(run-discovery %configuration)
(run-server router)))
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