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;; Tekuti
;; Copyright (C) 2008 Andy Wingo <wingo at pobox dot com>
;; 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, contact:
;;
;; Free Software Foundation Voice: +1-617-542-5942
;; 59 Temple Place - Suite 330 Fax: +1-617-542-2652
;; Boston, MA 02111-1307, USA gnu@gnu.org
;;; Commentary:
;;
;; This is the main script that will launch tekuti.
;;
;;; Code:
;;hack!
(define-module (tekuti comment)
#:use-module (tekuti git)
#:use-module (tekuti util)
#:use-module (tekuti filters)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-19)
#:use-module (sxml transform)
#:use-module (match-bind)
#:export (comment-from-object comment-sxml-content comment-timestamp build-comment-skeleton comment-readable-date
bad-new-comment-post? make-new-comment))
(define *comment-spec*
`((timestamp . ,string->number)))
(define (comment-from-object encoded-name sha1)
(let ((blob (git "show" sha1)))
(match-bind
"\n\n(.*)$" blob (_ content)
(fold cons
(filter
identity
(match-lines (substring blob 0 (- (string-length blob)
(string-length _)))
"^([^: ]+): +(.*)$" (_ k v)
(let* ((k (string->symbol k))
(parse (assq-ref *comment-spec* k)))
(if parse
(catch 'parse-error
(lambda ()
(cons k (parse v)))
(lambda args #f))
(cons k v)))))
`((raw-content . ,content)
(sha1 . ,sha1)
(key . ,encoded-name))))))
(define (comment-readable-date comment)
(let ((date (time-utc->date
(make-time time-utc 0 (assq-ref comment 'timestamp)))))
(date->string date "~e ~B ~Y ~l:~M ~p")))
(define (comment-raw-content comment)
(assq-ref comment 'raw-content))
(define (comment-sxml-content comment)
(let ((format (or (assq-ref comment 'format) 'wordpress)))
((case format
((wordpress) wordpress->sxml)
(else (lambda (text) `(pre ,text))))
(comment-raw-content comment))))
(define (comment-timestamp comment-alist)
(or (assq-ref comment-alist 'timestamp) #f))
(define (build-comment-skeleton comments)
(fold (lambda (sha1 parent)
(let* ((ts (comment-timestamp sha1))
(env (list "GIT_COMMMITTER=tekuti"
(format #f "GIT_COMMITTER_DATE=~a +0100" ts)
(format #f "GIT_AUTHOR_DATE=~a +0100" ts))))
(string-trim-both
(git* (cons* "commit-tree" sha1 (if parent (list "-p" parent) '()))
#:input "comment\n" #:env env))))
#f
comments))
(define (emailish? x)
(match-bind "^([a-zA-Z0-9.+-]+)@([a-zA-Z0-9-]+\\.)+[a-zA-Z]+$"
x (_ . args)
x
#f))
(define (bad-email? x)
(if (emailish? x)
#f
`(p "Please pretend to specify a valid email address.")))
(define (urlish? x)
(match-bind "^https?://([a-zA-Z0-9-]+\\.)+[a-zA-Z]+/[a-zA-Z0-9$_.+!*'(),;/?:@&=-]*$"
x (_ . args)
x
#f))
(define (bad-url? x)
(if (or (string-null? x) (urlish? x))
#f
`(p "Bad URL. (Only http and https are allowed.)")))
(define *allowed-tags*
`((a (href . ,urlish?) title)
(abbr title)
(acronym title)
(b)
(br)
(blockquote (cite . ,urlish?))
(code)
(em)
(i)
(p)
(pre)
(strike)
(strong)))
(define (compile-sxslt-rules tags)
(define (ok . body)
body)
`(,@(map (lambda (spec)
`(,(car spec)
((@ (,@(map (lambda (attr)
(if (symbol? attr)
`(,attr . ,ok)
`(,(car attr)
. ,(lambda (tag text)
(or ((cdr attr) text)
(throw 'bad-attr-value text))
(list tag text)))))
(cdr spec)))
. ,ok))
. ,ok))
*allowed-tags*)
(*text* . ,(lambda (tag text)
text))
(@ . ,(lambda (tag text)
(throw 'bad-attr tag)))
(*default* . ,(lambda (tag . body)
(throw 'bad-tag tag)))))
;; could be better, reflect nesting rules...
(define *valid-xhtml-rules*
`((div ,(compile-sxslt-rules *allowed-tags*)
. ,(lambda body body))))
(use-modules (sxml transform) (tekuti filters))
(define (bad-xhtml? x)
(catch #t
(lambda ()
(pre-post-order (wordpress->sxml x) *valid-xhtml-rules*)
#f)
(lambda (key . args)
`(div (p "Invalid XHTML")
,(case key
((parser-error)
`(pre ,(with-output-to-string
(lambda () (write args)))))
((bad-tag)
`(p "XHTML tag disallowed: " ,(symbol->string (car args))))
((bad-attr)
`(p "XHTML attribute disallowed: " ,(symbol->string (car args))))
((bad-attr-value)
`(p "XHTML attribute has bad value: " ,(car args)))
(else
(pk key args)
`(p "Jesus knows why, and so do you")))))))
(define *new-comment-spec*
`(("author" ,(lambda (x) #f))
("email" ,bad-email?)
("url" ,bad-url?)
("comment" ,bad-xhtml?)
("submit" ,(lambda (x) #f))))
(define (bad-new-comment-post? post-data)
(or (or-map (lambda (pair)
(and (not (assoc (car pair) *new-comment-spec*))
`(p "Bad post data: " ,(car pair))))
post-data)
(or-map (lambda (pair)
(and (not (assoc (car pair) post-data))
`(p "Incomplete post data:" ,(car pair))))
*new-comment-spec*)
(or-map (lambda (pair)
((cadr pair) (assoc-ref post-data (car pair))))
*new-comment-spec*)))
(use-modules (srfi srfi-11))
(define (make-tree-deep treeish add remove change)
(define (local? x) (null? (car x)))
(define (assert-added-files-not-present names dents)
(for-each
(lambda (dent)
(if (member (car dent) names)
(error "file already added" dent)))
dents))
(define (assert-referenced-files-present names dents)
(for-each
(lambda (name)
(if (not (assoc name dent-names))
(error "file already removed" name)))
names))
(let-values (((dents) (if treeish (git-ls-tree treeish #f) '()))
((ladd dadd) (partition local? add))
((lremove dremove) (partition local? remove))
((lchange dchange) (partition local? change)))
(assert-added-files-not-present (map cadr ladd) dents)
(assert-referenced-files-present
(append (map cdr lremove) (map caar lchange)) dents)
; (trc 'make-tree-deep treeish add remove change)
(git-mktree
(append
(map cdr ladd)
(filter-map
(lambda (dent)
(cond
((member (car dent) (map cdr lremove))
#f)
((member (car dent) (map cadr lchange))
(cdr lchange))
((and (eq? (caddr dent) 'tree)
(member (car dent)
(map caar (append dadd dremove dchange))))
(let ((level-down (lambda (x)
(if (equal? (caar x) (car dent))
(cons (cdar x) (cdr x))
#f))))
(list (car dent)
(make-tree-deep (cadr dent)
(filter-map level-down dadd)
(filter-map level-down dremove)
(filter-map level-down dchange))
'tree)))
(else dent)))
(append (filter-map (lambda (x)
(and (not (assoc (caar x) dents))
(list (caar x) #f 'tree)))
dadd)
dents))))))
(define (mutate-tree master add remove change message)
(let ((tree (make-tree-deep master add remove change)))
(string-trim-both
(git* `("commit-tree" ,tree "-p" ,master) #:input message
#:env '("GIT_COMMMITTER=tekuti")))))
(define (make-new-comment post post-data)
(let ((content (assoc-ref post-data "comment"))
(author (assoc-ref post-data "author"))
(email (assoc-ref post-data "email"))
(url (assoc-ref post-data "url")))
(let ((sha1 (create-blob
(with-output-to-string
(lambda ()
(for-each
(lambda (pair)
(format #t "~a: ~a\n" (car pair) (cdr pair)))
`((timestamp . ,(time-second (current-time)))
(author . ,(string-join
;; security foo
(string-split author #\newline)
" "))
(author_email . ,email)
(author_url . ,url)))
(display "\n")
(display content))))))
(git-update-ref
"refs/heads/master"
(lambda (master)
(mutate-tree master
`(((,(assq-ref post 'key) "comments") . (,sha1 ,sha1 "blob" "100644")))
'()
'()
"new comment"))
5))))
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