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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 (jakob utils comments)
#:use-module (commonmark)
#:use-module (gcrypt base16)
#:use-module (gcrypt hash)
#:use-module (ice-9 iconv)
#:use-module (ice-9 match)
#:use-module (ice-9 receive)
#:use-module (jakob dynamic capabilities comments)
#:use-module (jakob dynamic util)
#:use-module (json)
#:use-module (oop goops)
#:use-module (srfi srfi-19)
#:use-module (srfi srfi-43)
#:use-module (srfi-197)
#:use-module (web client)
#:use-module (web response)
#:export (render-comment-view fetch-comments fetch-webmentions))
(define (gravatar-url email)
(chain email
(string-downcase _)
(string-trim-both _)
(string->bytevector _ "utf8")
(bytevector-hash _ (lookup-hash-algorithm 'md5))
(bytevector->base16-string _)
(format #f "https://www.gravatar.com/avatar/~a" _)))
(define (safe-markdown->sxml text)
"Convert TEXT to an sxml form filtering out any unsafe entities"
(define (sanitize sexp)
(cond ((and (list? sexp)
(positive? (length sexp))
(eqv? 'img (car sexp)))
#f)
((list? sexp)
(filter identity (map sanitize sexp)))
(else sexp)))
(sanitize (commonmark->sxml text)))
(define (webmention->comment webmention)
(define (wm-not-null? value)
(and value
(not (eqv? 'null value))
(not (string= "" value))))
(let* ((author (assoc-ref webmention "author"))
(author-name (assoc-ref author "name"))
(author-url (assoc-ref author "url"))
(author-url
(if (wm-not-null? author-url)
author-url
(assoc-ref webmention "wm-source")))
(author-photo (assoc-ref author "photo"))
(author-photo
(cond ((string-prefix? "https://lobste.rs/" author-url) "/static/image/lobsters.png")
((wm-not-null? author-photo) author-photo)
(else "/static/image/default-icon.png")))
(content (assoc-ref webmention "content"))
(published-time (assoc-ref webmention "published"))
(received-time (assoc-ref webmention "wm-received"))
(url (assoc-ref webmention "url"))
(time (if (eqv? 'null published-time) received-time published-time))
;; TODO: We shouldn't have to normalize; we should just parse this into
;; a SRFI-19 date when we're creating the alist. (Or, even better, use
;; records instead of alists so we can avoid the `webmention' tag.)
(time (date->string (string->date time "~Y~m~dT~H~M~S") "~Y-~m-~d ~H:~M:~S.~N")))
`((webmention . #t)
(name . ,author-name)
(photo . ,author-photo)
(comment . ,(if content (assoc-ref content "text") #f))
(url . ,author-url)
(publish-time . ,time)
(reactions . ()))))
(define (format-comment comment)
"Format `comment', an alist, as SXML for a comment-type interaction"
(define (strip uri)
"Attempt to remove any sort of protocol specification from `uri'"
(let* ((needle "://")
(index (string-contains uri needle)))
(if index
(strip (substring uri (+ index (string-length needle))))
uri)))
(let* ((author-name (assoc-ref comment 'name))
(author-url (assoc-ref comment 'url))
(author-photo (cond ((assoc 'email comment) (gravatar-url (assoc-ref comment 'email)))
((assoc 'photo comment) (assoc-ref comment 'photo))
(else "/static/image/default-icon.png")))
(publish-datetime (assoc-ref comment 'publish-time))
(content-text (assoc-ref comment 'comment))
(content-reactions (assoc-ref comment 'reactions)))
`(li (@ (class "p-comment h-cite comment comment-source-internal"))
,(if (assoc 'webmention comment)
`(img (@ (class "comment-source-identifier")
(alt "Icon for comments posted externally and syndicated by Webmention")
(src "/static/image/webmention-logo.png")))
`(img (@ (class "comment-source-identifier")
(alt "Icon for comments posted on jakob.space")
(src "/static/image/lambda.svg"))))
(div (@ (class "p-author h-card author"))
(img (@ (class "u-photo") (src ,author-photo))))
(div (@ (class "metaline"))
(span (@ (class author-name)) ,author-name)
,@(if author-url
`(" • "
(a (@ (class "author-url")
(href ,author-url))
"(" ,(strip author-url) ")"))
`())
" • "
(time (@ (class "dt-published")
(datetime ,publish-datetime))
,(date->string
(string->date publish-datetime "~Y~m~d ~H~M~S.~N")
"~B ~e, ~Y at ~H:~M")))
(div (@ (class "e-content p-name comment-content"))
,@(chain content-text
(safe-markdown->sxml _)))
(ul (@ (class "comment-reactions"))
,@(map (match-lambda
((emote . count)
`(li ,(format #f "~a (~a)" emote count))))
content-reactions)))))
(define (format-interaction webmention)
"Format `webmention', an alist, as SXML for a rich interaction without content"
(let* ((author (assoc-ref webmention "author"))
(author-name (assoc-ref author "name"))
(author-url (assoc-ref author "url"))
(author-url
(if (wm-not-null? author-url)
author-url
(assoc-ref webmention "wm-source")))
(author-photo (assoc-ref author "photo"))
(author-photo
(cond ((string-prefix? "https://lobste.rs/" author-url) "/static/image/lobsters.png")
((wm-not-null? author-photo) author-photo)
(else "/static/image/default-icon.png"))))
`(li (@ (class "p-comment h-cite interaction comment-source-webmention"))
(a (@ (href ,author-url))
(img (@ (class "u-photo") (src ,author-photo))))
(div (@ (class "e-content p-name comment-content"))
(em
,(match (assoc-ref webmention "wm-property")
("repost-of" "Reposted this!")
("like-of" "Favorited this!")
("bookmark-of" "Bookmarked this!")
("mention-of" "Mentioned this!")
(_ "[No Text Provided]"))))
(img (@ (class "comment-source-identifier")
(alt "Webmention logo")
(src "/static/image/webmention-logo.png"))))))
(define (render-comment-view comments-response webmentions-response)
"Render `response', the output of `fetch-webmentions', as SXML"
(let ((webmention-comments (filter (lambda (x) (string= (assoc-ref x "wm-property") "in-reply-to"))
(vector->list (assoc-ref webmentions-response "children")))))
(map format-comment
(sort (append comments-response (map webmention->comment webmention-comments))
(lambda (a b) (time>? (date->time-utc (string->date (assoc-ref a 'publish-time) "~Y~m~d ~H~M~S.~N"))
(date->time-utc (string->date (assoc-ref b 'publish-time) "~Y~m~d ~H~M~S.~N"))))))))
(define (fetch-comments slug)
"Blocking call to webmention.io to retrieve a vector of all Webmentions for `slug'"
(get-comments-by-slug slug))
(define (fetch-webmentions slug)
"Blocking call to webmention.io to retrieve a vector of all Webmentions for `slug'"
(define prefixes '("http://jakob.space/" "https://jakob.space/"
"http://jakob.space/blog/" "https://jakob.space/blog/"))
(let* ((target-queries (map (lambda (pre)
(format #f "target[]=~a~a.html" pre slug))
prefixes))
(url (format #f "https://webmention.io/api/mentions.jf2?per-page=200&page=0&~a"
(string-join target-queries "&"))))
(receive (response-status response-body)
(http-request url)
(call-with-input-string (bytevector->string response-body "UTF-8") json->scm))))
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