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;;; tissue --- Text based issue tracker
;;; Copyright © 2022 Arun Isaac <arunisaac@systemreboot.net>
;;;
;;; This file is part of tissue.
;;;
;;; tissue 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.
;;;
;;; tissue 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 tissue. If not, see <https://www.gnu.org/licenses/>.
(define-module (tissue web server)
#:use-module (rnrs io ports)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-26)
#:use-module (ice-9 match)
#:use-module (htmlprag)
#:use-module (sxml simple)
#:use-module ((system repl server) #:select (make-unix-domain-server-socket))
#:use-module (web request)
#:use-module (web response)
#:use-module (web server)
#:use-module (web uri)
#:use-module (xapian xapian)
#:use-module (tissue conditions)
#:use-module (tissue document)
#:use-module (tissue search)
#:export (start-web-server))
(define %css
"
body {
max-width: 1000px;
margin: 0 auto;
}
form {
text-align: center;
}
.search-result {
list-style-type: none;
padding: 0.5em;
}
.search-result a {
text-decoration: none;
font-size: larger;
}
.search-result-metadata {
color: dimgray;
display: block;
font-size: smaller;
}
.search-result-snippet {
font-size: smaller;
}
a.tag {
padding: 0.25em 0.4em;
color: white;
background-color: blue;
border-radius: 0.5em;
margin: auto 0.25em;
font-size: smaller;
}
a.tag-bug {
background-color: red;
}
a.tag-feature {
background-color: green;
}
a.tag-progress, a.tag-unassigned {
background-color: orange;
color: black;
}
a.tag-chore {
background-color: khaki;
color: black;
}")
(define (make-search-page results css)
"Return SXML for a page with search RESULTS. CSS is a URI to a
stylesheet."
`(html
(head
(title "Tissue search")
(style ,%css)
,@(if css
(list `(link (@ (href "/style.css")
(rel "stylesheet")
(type "text/css"))))
(list)))
(body
(form (@ (action "/search") (method "GET"))
(input (@ (type "search") (name "query") (placeholder "Enter search query")))
(input (@ (type "submit") (value "Search"))))
(ul ,@results))))
(define (query-parameters query)
"Return an association list of query parameters in web QUERY string."
(if query
(map (lambda (parameter)
(match (string-split parameter #\=)
((key value)
(cons (uri-decode key)
(uri-decode value)))))
(string-split query #\&))
'()))
(define (handler request body xapian-index css)
"Handle web REQUEST with BODY and return two values---the response
headers and body. XAPIAN-INDEX is the path to the xapian database
relative to the top-level of the current git repository. CSS is a URI
to a stylesheet."
(let ((path (uri-path (request-uri request)))
(parameters (query-parameters (uri-query (request-uri request)))))
(format #t "~a ~a\n"
(request-method request)
path)
(cond
((string=? path "/")
(values '((content-type . (text/html)))
(sxml->html (make-search-page '() css))))
((string=? "/search" path)
(values '((content-type . (text/html)))
(sxml->html
(make-search-page
(call-with-database xapian-index
(lambda (db)
(search-map document->sxml
db
(assoc-ref parameters "query"))))
css))))
(else
(values (build-response #:code 404)
(string-append "Resource not found: "
(uri->string (request-uri request))))))))
(define (start-web-server socket-address xapian-index css)
"Start web server listening on SOCKET-ADDRESS. XAPIAN-INDEX is the
path to the xapian database relative to the top-level of the current
git repository. CSS is a URI to a stylesheet."
(format (current-error-port)
"Tissue web server listening on ~a~%"
(cond
;; IPv4 address
((= (sockaddr:fam socket-address) AF_INET)
(format #f "~a:~a"
(inet-ntop (sockaddr:fam socket-address)
(sockaddr:addr socket-address))
(sockaddr:port socket-address)))
;; IPv6 address
((= (sockaddr:fam socket-address) AF_INET6)
(format #f "[~a]:~a"
(inet-ntop (sockaddr:fam socket-address)
(sockaddr:addr socket-address))
(sockaddr:port socket-address)))
;; Unix socket
((= (sockaddr:fam socket-address) AF_UNIX)
(sockaddr:path socket-address))))
(run-server (lambda (request body)
;; Explicitly dereference the module and handler
;; variable each time so as to support live hacking.
((module-ref (resolve-module '(tissue web server))
'handler)
request body xapian-index css))
'http
(cond
;; IPv4 or IPv6 address
((or (= (sockaddr:fam socket-address) AF_INET)
(= (sockaddr:fam socket-address) AF_INET6))
(list #:family (sockaddr:fam socket-address)
#:addr (sockaddr:addr socket-address)
#:port (sockaddr:port socket-address)))
;; Unix socket
((= (sockaddr:fam socket-address) AF_UNIX)
(list #:socket (make-unix-domain-server-socket
#:path (sockaddr:path socket-address)))))))
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