From 80f03aac18a783f31a28f58f698e50e54461ef15 Mon Sep 17 00:00:00 2001 From: Cadence Ember Date: Tue, 23 Aug 2022 21:57:42 +1200 Subject: [PATCH] Initial commit * Viewing for wiki pages * Searches * Categories * Logo * Image proxy * Config loaded from config.txt * AGPL 3 license --- .gitignore | 12 + LICENSE | 661 ++++++++++++++++++++++++++++++++++++ src/application-globals.rkt | 73 ++++ src/config.rkt | 33 ++ src/page-category.rkt | 72 ++++ src/page-not-found.rkt | 18 + src/page-proxy.rkt | 30 ++ src/page-search.rkt | 82 +++++ src/page-wiki.rkt | 234 +++++++++++++ src/pure-utils.rkt | 30 ++ src/server.rkt | 39 +++ src/typed-rackunit.rkt | 11 + src/url-utils.rkt | 71 ++++ src/xexpr-utils.rkt | 200 +++++++++++ static/breezewiki.svg | 125 +++++++ static/main.css | 206 +++++++++++ 16 files changed, 1897 insertions(+) create mode 100644 .gitignore create mode 100644 LICENSE create mode 100644 src/application-globals.rkt create mode 100644 src/config.rkt create mode 100644 src/page-category.rkt create mode 100644 src/page-not-found.rkt create mode 100644 src/page-proxy.rkt create mode 100644 src/page-search.rkt create mode 100644 src/page-wiki.rkt create mode 100644 src/pure-utils.rkt create mode 100644 src/server.rkt create mode 100644 src/typed-rackunit.rkt create mode 100644 src/url-utils.rkt create mode 100644 src/xexpr-utils.rkt create mode 100644 static/breezewiki.svg create mode 100644 static/main.css diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..82302eb --- /dev/null +++ b/.gitignore @@ -0,0 +1,12 @@ +# Emacs crud files +*~ +.#* +\#*# + +# Experiments +*.experiment +*.typedattempt +*.untyped + +# Personal +/config.txt diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..be3f7b2 --- /dev/null +++ b/LICENSE @@ -0,0 +1,661 @@ + GNU AFFERO GENERAL PUBLIC LICENSE + Version 3, 19 November 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU Affero General Public License is a free, copyleft license for +software and other kinds of works, specifically designed to ensure +cooperation with the community in the case of network server software. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. 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It is safest +to attach them to the start of each source file to most effectively +state the exclusion of warranty; and each file should have at least +the "copyright" line and a pointer to where the full notice is found. + + + Copyright (C) + + This program is free software: you can redistribute it and/or modify + it under the terms of the GNU Affero 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 Affero General Public License for more details. + + You should have received a copy of the GNU Affero General Public License + along with this program. If not, see . + +Also add information on how to contact you by electronic and paper mail. + + If your software can interact with users remotely through a computer +network, you should also make sure that it provides a way for users to +get its source. For example, if your program is a web application, its +interface could display a "Source" link that leads users to an archive +of the code. There are many ways you could offer source, and different +solutions will be better for different programs; see section 13 for the +specific requirements. + + You should also get your employer (if you work as a programmer) or school, +if any, to sign a "copyright disclaimer" for the program, if necessary. +For more information on this, and how to apply and follow the GNU AGPL, see +. diff --git a/src/application-globals.rkt b/src/application-globals.rkt new file mode 100644 index 0000000..cb875f4 --- /dev/null +++ b/src/application-globals.rkt @@ -0,0 +1,73 @@ +#lang racket/base +(require net/http-easy + "config.rkt") + +(provide + ; timeout durations for http-easy requests + timeouts + ; generates a consistent template for wiki page content to sit in + generate-wiki-page) + +(module+ test + (require rackunit + html-writing)) + +(define timeouts (make-timeout-config #:lease 5 #:connect 5)) + +(define (generate-wiki-page source-url wikiname title content) + (define (required-styles origin) + (map (λ (dest-path) (format dest-path origin)) + '(#;"~a/load.php?lang=en&modules=skin.fandomdesktop.styles&only=styles&skin=fandomdesktop" + #;"~a/load.php?lang=en&modules=ext.gadget.dungeonsWiki%2CearthWiki%2Csite-styles%2Csound-styles&only=styles&skin=fandomdesktop" + #;"~a/load.php?lang=en&modules=site.styles&only=styles&skin=fandomdesktop" + ; combine the above entries into a single request for potentially extra speed - fandom.com doesn't even do this! + "~a/load.php?lang=en&modules=skin.fandomdesktop.styles%7Cext.fandom.PortableInfoboxFandomDesktop.css%7Cext.fandom.GlobalComponents.CommunityHeaderBackground.css%7Cext.gadget.site-styles%2Csound-styles%7Csite.styles&only=styles&skin=fandomdesktop" + "~a/wikia.php?controller=ThemeApi&method=themeVariables"))) + `(html + (head + (meta (@ (name "viewport") (content "width=device-width, initial-scale=1"))) + (title ,(format "~a | ~a" title (config-get 'application-name))) + (style ":root { --theme-page-background-color: #dfdfe0 }") ; fallback in case styles don't load fast enough + ,@(map (λ (url) + `(link (@ (rel "stylesheet") (type "text/css") (href ,url)))) + (required-styles (format "https://~a.fandom.com" wikiname))) + (link (@ (rel "stylesheet") (type "text/css") (href "/static/main.css")))) + (body (@ (class "skin-fandomdesktop theme-fandomdesktop-light")) + (div (@ (class "main-container")) + (div (@ (class "fandom-community-header__background tileHorizontally header"))) + (div (@ (class "page")) + (main (@ (class "page__main")) + (div (@ (class "custom-top")) + (h1 (@ (class "page-title")) ,title) + (nav (@ (class "sitesearch")) + (form (@ (action ,(format "/~a/search" wikiname))) + (label "Search " + (input (@ (type "text") (name "q"))))))) + (div (@ (id "content") #;(class "page-content")) + (div (@ (id "mw-content-text")) + ,content)) + (footer (@ (class "custom-footer")) + (img (@ (class "my-logo") (src "/static/breezewiki.svg"))) + (div (@ (class "custom-footer__cols")) + (div + (p + (a (@ (href "https://gitdab.com/cadence/breezewiki")) + ,(format "~a source code" (config-get 'application-name)))) + (p + (a (@ (href "https://lists.sr.ht/~cadence/breezewiki-discuss")) + "Discussions / Bug reports / Feature requests")) + ,(if (config-get 'instance-is-official) + `(p ,(format "This instance is run by the ~a developer, " (config-get 'application-name)) + (a (@ (href "https://cadence.moe/contact")) + "Cadence.")) + `(p + ,(format "This unofficial instance is based off the ~a source code, but is not administered by its developer." (config-get 'application-name))))) + (div + (p "This page displays proxied content from " + (a (@ (href ,source-url) (rel "noreferrer")) ,source-url) + ". Text content is available under the Creative Commons Attribution-Share Alike License 3.0 (Unported), " + (a (@ (href "https://www.fandom.com/licensing")) "see license info.") + " Media files may have different copying restrictions.") + (p ,(format "Fandom is a trademark of Fandom, Inc. ~a is not affiliated with Fandom." (config-get 'application-name)))))))))))) +(module+ test + (check-not-false (xexp->html (generate-wiki-page "" "test" "test" '(template))))) diff --git a/src/config.rkt b/src/config.rkt new file mode 100644 index 0000000..136c08a --- /dev/null +++ b/src/config.rkt @@ -0,0 +1,33 @@ +#lang racket/base + +(provide + config-get) + +(define (config-get key) + (hash-ref config key)) + +(define default-config + '((port . 10416) + (debug . #f) + (instance-is-official . #f) ; please don't turn this on, or you will make me very upset + (application-name . "BreezeWiki"))) + +(define config + (make-hasheq + (append + default-config + (with-handlers ([exn:fail:filesystem:errno? (λ (exn) + '())]) + (call-with-input-file "../config.txt" + (λ (in) + (let loop ([alist '()]) + (let ([key (read in)] + [value (read in)]) + (if (eq? value eof) + alist + (loop (cons (cons key + (cond + [(eq? value 'true) #t] + [(eq? value 'false) #f] + [#t value])) + alist))))))))))) diff --git a/src/page-category.rkt b/src/page-category.rkt new file mode 100644 index 0000000..7760c97 --- /dev/null +++ b/src/page-category.rkt @@ -0,0 +1,72 @@ +#lang racket/base +(require racket/dict + racket/list + racket/string + (prefix-in easy: net/http-easy) + ; html libs + html-writing + ; web server libs + net/url + web-server/http + (only-in web-server/dispatchers/dispatch next-dispatcher) + #;(only-in web-server/http/redirect redirect-to) + "config.rkt" + "application-globals.rkt" + "url-utils.rkt" + "xexpr-utils.rkt") + +(provide + page-category) + +(module+ test + (require rackunit) + (define category-json-data + '#hasheq((batchcomplete . #t) (continue . #hasheq((cmcontinue . "page|4150504c45|41473") (continue . "-||"))) (query . #hasheq((categorymembers . (#hasheq((ns . 0) (pageid . 25049) (title . "Item (entity)")) #hasheq((ns . 0) (pageid . 128911) (title . "3D")) #hasheq((ns . 0) (pageid . 124018) (title . "A Very Fine Item")) #hasheq((ns . 0) (pageid . 142208) (title . "Amethyst Shard")) #hasheq((ns . 0) (pageid . 121612) (title . "Ankle Monitor"))))))))) + +(define (generate-results-page dest-url wikiname prefixed-category data) + (define members (jp "/query/categorymembers" data)) + (generate-wiki-page + dest-url + wikiname + prefixed-category + `(div (@ (class "mw-parser-output")) + (ul (@ (class "my-category-list")) + ,@(map + (λ (result) + (let* ([title (jp "/title" result)] + [page-path (regexp-replace* #rx" " title "_")]) + `(li + (a (@ (href ,(format "/~a/wiki/~a" wikiname page-path))) + ,title)))) + members))))) + +(define (page-category req) + (response-handler + (define wikiname (path/param-path (first (url-path (request-uri req))))) + (define prefixed-category (path/param-path (caddr (url-path (request-uri req))))) + + (define origin (format "https://~a.fandom.com" wikiname)) + (define dest-url (format "~a/api.php?~a" + origin + (params->query `(("action" . "query") + ("list" . "categorymembers") + ("cmtitle" . ,prefixed-category) + ("cmlimit" . "max") + ("formatversion" . "2") + ("format" . "json"))))) + (printf "out: ~a~n" dest-url) + (define dest-res (easy:get dest-url #:timeouts timeouts)) + + (define data (easy:response-json dest-res)) + (define body (generate-results-page dest-url wikiname prefixed-category data)) + (when (config-get 'debug) + ; used for its side effects + ; convert to string with error checking, error will be raised if xexp is invalid + (xexp->html body)) + (response/output + #:code 200 + (λ (out) + (write-html body out))))) +(module+ test + (check-not-false ((query-selector (attribute-selector 'href "/test/wiki/Ankle_Monitor") + (generate-results-page "" "test" "Category:Items" category-json-data))))) diff --git a/src/page-not-found.rkt b/src/page-not-found.rkt new file mode 100644 index 0000000..57f357b --- /dev/null +++ b/src/page-not-found.rkt @@ -0,0 +1,18 @@ +#lang racket/base + +(require html-writing + web-server/http) + +(provide + page-not-found) + +(define (page-not-found req) + (response/output + #:code 404 + (λ (out) + (write-html + `(html + (body + (h1 "Not found.") + (pre ,(format "~v" req)))) + out)))) diff --git a/src/page-proxy.rkt b/src/page-proxy.rkt new file mode 100644 index 0000000..3b63506 --- /dev/null +++ b/src/page-proxy.rkt @@ -0,0 +1,30 @@ +#lang racket/base +(require racket/dict + racket/match + racket/port + ; libs + (prefix-in easy: net/http-easy) + ; html libs + html-parsing + html-writing + ; web server libs + net/url + web-server/http + (only-in web-server/dispatchers/dispatch next-dispatcher) + "url-utils.rkt") + +(provide + page-proxy) + +(define (page-proxy req) + (match (dict-ref (url-query (request-uri req)) 'dest #f) + [(? string? dest) + (if (is-fandom-url? dest) + (let ([dest-r (easy:get dest #:stream? #t)]) + (response/output + #:code (easy:response-status-code dest-r) + #:mime-type (easy:response-headers-ref dest-r 'content-type) + (λ (out) + (copy-port (easy:response-output dest-r) out)))) + (next-dispatcher))] + [#f (next-dispatcher)])) diff --git a/src/page-search.rkt b/src/page-search.rkt new file mode 100644 index 0000000..5948af0 --- /dev/null +++ b/src/page-search.rkt @@ -0,0 +1,82 @@ +#lang racket/base +(require racket/dict + racket/list + racket/string + (prefix-in easy: net/http-easy) + ; html libs + html-writing + ; web server libs + net/url + web-server/http + (only-in web-server/dispatchers/dispatch next-dispatcher) + #;(only-in web-server/http/redirect redirect-to) + "config.rkt" + "application-globals.rkt" + "url-utils.rkt" + "xexpr-utils.rkt") + +(provide + page-search) + +(module+ test + (require rackunit) + (define search-json-data + '#hasheq((batchcomplete . #t) (query . #hasheq((search . (#hasheq((ns . 0) (pageid . 219) (size . 1482) (snippet . "") (timestamp . "2022-08-21T08:54:23Z") (title . "Gacha Capsule") (wordcount . 214)) #hasheq((ns . 0) (pageid . 201) (size . 1198) (snippet . "") (timestamp . "2022-07-11T17:52:47Z") (title . "Badges") (wordcount . 181))))))))) + +(define (generate-results-page dest-url wikiname query data) + (define search-results (jp "/query/search" data)) + (generate-wiki-page + dest-url + wikiname + "Search Results" + `(div (@ (class "mw-parser-output")) + (p ,(format "~a results found for " (length search-results)) + (strong ,query)) + (ul ,@(map + (λ (result) + (let* ([title (jp "/title" result)] + [page-path (regexp-replace* #rx" " title "_")] + [timestamp (jp "/timestamp" result)] + [wordcount (jp "/wordcount" result)] + [size (jp "/size" result)]) + `(li (@ (class "my-result")) + (a (@ (class "my-result__link") (href ,(format "/~a/wiki/~a" wikiname page-path))) + ,title) + (div (@ (class "my-result__info")) + "last edited " + (time (@ (datetime ,timestamp)) ,(list-ref (string-split timestamp "T") 0)) + ,(format ", ~a words, ~a kb" + wordcount + (exact->inexact (/ (round (/ size 100)) 10))))))) + search-results))))) + +(define (page-search req) + (response-handler + (define wikiname (path/param-path (first (url-path (request-uri req))))) + (define query (dict-ref (url-query (request-uri req)) 'q #f)) + + (define origin (format "https://~a.fandom.com" wikiname)) + (define dest-url (format "~a/api.php?~a" + origin + (params->query `(("action" . "query") + ("list" . "search") + ("srsearch" . ,query) + ("formatversion" . "2") + ("format" . "json"))))) + (printf "out: ~a~n" dest-url) + (define dest-res (easy:get dest-url #:timeouts timeouts)) + + (define data (easy:response-json dest-res)) + + (define body (generate-results-page dest-url wikiname query data)) + (when (config-get 'debug) + ; used for its side effects + ; convert to string with error checking, error will be raised if xexp is invalid + (xexp->html body)) + (response/output + #:code 200 + (λ (out) + (write-html body out))))) +(module+ test + (check-not-false ((query-selector (attribute-selector 'href "/test/wiki/Gacha_Capsule") + (generate-results-page "" "test" "Gacha" search-json-data))))) diff --git a/src/page-wiki.rkt b/src/page-wiki.rkt new file mode 100644 index 0000000..abd4aeb --- /dev/null +++ b/src/page-wiki.rkt @@ -0,0 +1,234 @@ +#lang racket/base +(require racket/dict + racket/function + racket/list + racket/string + ; libs + (prefix-in easy: net/http-easy) + ; html libs + html-parsing + html-writing + ; web server libs + net/url + web-server/http + web-server/dispatchers/dispatch + ; my libs + "pure-utils.rkt" + "xexpr-utils.rkt" + "url-utils.rkt" + "application-globals.rkt") + +(provide + page-wiki) + +(module+ test + (require rackunit) + (define wiki-document + '(*TOP* + (div (@ (class "mw-parser-output")) + (aside (@ (role "region") (class "portable-infobox pi-theme-wikia pi-layout-default")) + (h2 (@ (class "pi-item pi-title") (data-source "title")) + "Infobox Title") + (figure (@ (class "pi-item pi-image") (data-sourec "image")) + (a (@ (href "https://static.wiki.nocookie.net/nice-image.png") (class "image image-thumbnail") (title "")) + (img (@ (src "https://static.wiki.nocookie.net/nice-image-thumbnail.png") (class "pi-image-thumbnail"))))) + (div (@ (class "pi-item pi-data") (data-source "description")) + (h3 (@ (class "pi-data-label")) + "Description") + (div (@ (class "pi-data-value")) + "Mystery infobox!"))) + (div (@ (data-test-collapsesection) (class "collapsible collapsetoggle-inline collapsed")) + (i (b "This section is hidden for dramatic effect.")) + (div (@ (class "collapsible-content")) + (p "Another page link: " + (a (@ (data-test-wikilink) (href "https://test.fandom.com/wiki/Another_Page") (title "Another Page")) + "Another Page")))))))) + +(define (preprocess-html-wiki html) + (define (rr* find replace contents) + (regexp-replace* find contents replace)) + ((compose1 + ; fix navbox list nesting + ; navbox on right of page has incorrect html "
  • " and the xexpr parser puts the
  • much further up the tree + ; add a
      to make the parser happy + ; usage: /fallout/wiki/Fallout:_New_Vegas_achievements_and_trophies + (curry rr* #rx"(]*>\n?)(
    • )" "\\1
        \\2") + ; change

        to

        to make the parser happy + (curry rr* #rx"(]*>)[ \t]*

        ([^<]*)

        " "\\1\\2")) + html)) +(module+ test + (check-equal? (preprocess-html-wiki "\n
      • Hey
        • ") + "\n
        • Hey
          • ") + (check-equal? (preprocess-html-wiki "

          Caption text.

          ") + "
          Caption text.
          ")) + +(define (update-tree-wiki tree wikiname) + (update-tree + (λ (element element-type attributes children) + ;; replace whole element? + (cond + ; wrap tables in a div.table-scroller + [(and (eq? element-type 'table) + (has-class? "wikitable" attributes) + (not (dict-has-key? attributes 'data-scrolling))) + `(div + ((class "table-scroller")) + ((,element-type (@ (data-scrolling) ,@attributes) + ,@children)))] + ; exclude empty figcaptions + [(and (eq? element-type 'figcaption) + (or (eq? (length (filter element-is-element? children)) 0) + ((query-selector (λ (element-type attributes children) + (eq? element-type 'use)) + element)))) + return-no-element] + ; exclude infobox items that are videos, and gallery items that are videos + [(and (or (has-class? "pi-item" attributes) + (has-class? "wikia-gallery-item" attributes)) + ((query-selector (λ (element-type attributes children) + (has-class? "video-thumbnail" attributes)) + element))) + return-no-element] + ; exclude the invisible brackets after headings + [(and (eq? element-type 'span) + (has-class? "mw-editsection" attributes)) + return-no-element] + ; display a link instead of an iframe + [(eq? element-type 'iframe) + (let ([src (car (dict-ref attributes 'src null))]) + `(a + ((class "iframe-alternative") (href ,src)) + (,(format "Embedded media: ~a" src))))] + [#t + (list element-type + ;; attributes + ((compose1 + ; uncollapsing + (curry attribute-maybe-update 'class + (λ (class) + (string-join + ((compose1 + ; uncollapse all navbox items (bottom of page mass navigation) + (curry u + (λ (classlist) (and (eq? element-type 'table) + (member "navbox" classlist) + (member "collapsed" classlist))) + (λ (classlist) (filter (curry (negate equal?) "collapsed") classlist))) + ; uncollapse portable-infobox sections + (curry u + (λ (classlist) (and (eq? element-type 'section) + (member "pi-collapse" classlist))) + (λ (classlist) (filter (λ (v) + (and (not (equal? v "pi-collapse-closed")) + (not (equal? v "pi-collapse")))) + classlist))) + ; generic: includes article sections and tables, probably more + (curry u + (λ (classlist) (and (member "collapsible" classlist) + (member "collapsed" classlist))) + (λ (classlist) (filter (curry (negate equal?) "collapsed") classlist)))) + (string-split class " ")) + " "))) + ; change links to stay on the same wiki + (curry attribute-maybe-update 'href + (λ (href) + ((compose1 + (λ (href) (regexp-replace #rx"^(/wiki/.*)" href (format "/~a\\1" wikiname))) + (λ (href) (regexp-replace #rx"^https://([a-z-]+).fandom.com(/wiki/.*)" href "/\\1\\2"))) + href))) + ; add noreferrer to a.image + (curry u + (λ (v) (and (eq? element-type 'a) + (has-class? "image" v))) + (λ (v) (dict-update attributes 'rel (λ (s) + (list (string-append (car s) " noreferrer"))) + '("")))) + ; proxy images from inline styles + (curry attribute-maybe-update 'style + (λ (style) + (regexp-replace #rx"url\\(['\"]?(.*?)['\"]?\\)" style + (λ (whole url) + (string-append + "url(" + (u-proxy-url url) + ")"))))) + ; proxy images from src attributes + (curry attribute-maybe-update 'src u-proxy-url) + ; don't lazyload images + (curry u + (λ (v) (dict-has-key? v 'data-src)) + (λ (v) (attribute-maybe-update 'src (λ (_) (car (dict-ref v 'data-src))) v))) + ; don't use srcset - TODO: use srcset? + (λ (v) (dict-remove v 'srcset))) + attributes) + ;; children + ((compose1 + ; wrap blinking animated images in a slot so they can be animated with CSS + (curry u + (λ (v) (and (has-class? "animated" attributes) + ((length v) . > . 1))) + (λ (v) + `((span (@ (class "animated-slot") (style ,(format "--steps: ~a" (length v)))) + ,@v))))) + children))])) + tree)) +(module+ test + (define transformed (update-tree-wiki wiki-document "test")) + ; check that wikilinks are changed to be local + (check-equal? (get-attribute 'href (bits->attributes + ((query-selector + (λ (t a c) (dict-has-key? a 'data-test-wikilink)) + transformed)))) + "/test/wiki/Another_Page") + ; check that a.image has noreferrer + (check-equal? (get-attribute 'rel (bits->attributes + ((query-selector + (λ (t a c) (and (eq? t 'a) + (has-class? "image" a))) + transformed)))) + " noreferrer") + ; check that article collapse sections become uncollapsed + (check-equal? (get-attribute 'class (bits->attributes + ((query-selector + (λ (t a c) (dict-has-key? a 'data-test-collapsesection)) + transformed)))) + "collapsible collapsetoggle-inline")) + +(define (page-wiki req) + (define wikiname (path/param-path (first (url-path (request-uri req))))) + (define origin (format "https://~a.fandom.com" wikiname)) + (define path (string-join (map path/param-path (cddr (url-path (request-uri req)))) "/")) + (define source-url (format "https://~a.fandom.com/wiki/~a" wikiname path)) + + (define dest-url (format "~a/api.php?~a" + origin + (params->query `(("action" . "parse") + ("page" . ,path) + ("prop" . "text") + ("formatversion" . "2") + ("format" . "json"))))) + (printf "out: ~a~n" dest-url) + (define dest-res (easy:get dest-url #:timeouts timeouts)) + + (cond + [(eq? 200 (easy:response-status-code dest-res)) + (let* ([data (easy:response-json dest-res)] + [title (jp "/parse/title" data "")] + [page-html (jp "/parse/text" data "")] + [page-html (preprocess-html-wiki page-html)] + [page (html->xexp page-html)]) + (if (equal? "missingtitle" (jp "/error/code" data #f)) + (next-dispatcher) + (response-handler + (define body + (generate-wiki-page source-url wikiname title (update-tree-wiki page wikiname))) + (define redirect-msg ((query-selector (attribute-selector 'class "redirectMsg") body))) + (response/output + #:code 200 + #:headers (if redirect-msg + (let* ([dest (get-attribute 'href (bits->attributes ((query-selector (λ (t a c) (eq? t 'a)) redirect-msg))))] + [value (bytes-append #"0;url=" (string->bytes/utf-8 dest))]) + (list (header #"Refresh" value))) + (list)) + (λ (out) + (write-html body out))))))])) diff --git a/src/pure-utils.rkt b/src/pure-utils.rkt new file mode 100644 index 0000000..eb730ec --- /dev/null +++ b/src/pure-utils.rkt @@ -0,0 +1,30 @@ +#lang typed/racket/base + +(provide + ; call the updater on the dictionary key only if it has that key + alist-maybe-update + ; update a value only if a condition succeeds on it + u) + +(module+ test + (require "typed-rackunit.rkt")) + +(: alist-maybe-update (∀ (A B) ((Listof (Pairof A B)) A (B -> B) -> (Listof (Pairof A B))))) +(define (alist-maybe-update alist key updater) + (map (λ ([p : (Pairof A B)]) + (if (eq? (car p) key) + (cons (car p) (updater (cdr p))) + p)) + alist)) +(module+ test + (check-equal? (alist-maybe-update '((a . 5) (b . 6)) 'a (λ ([x : Number]) (+ x 10))) + '((a . 15) (b . 6))) + (check-equal? (alist-maybe-update '((b . 6)) 'a (λ ([x : Number]) (+ x 10))) + '((b . 6)))) + +(: u (∀ (A) ((A -> Any) (A -> A) A -> A))) +(define (u condition updater value) + (if (condition value) (updater value) value)) +(module+ test + (check-equal? (u (λ ([x : Integer]) (< x 5)) (λ ([x : Integer]) (* x -1)) 4) -4) + (check-equal? (u (λ ([x : Integer]) (< x 5)) (λ ([x : Integer]) (* x -1)) 8) 8)) diff --git a/src/server.rkt b/src/server.rkt new file mode 100644 index 0000000..a146538 --- /dev/null +++ b/src/server.rkt @@ -0,0 +1,39 @@ +#lang racket/base +(require racket/path + net/url + web-server/servlet-dispatch + web-server/dispatchers/filesystem-map + (prefix-in pathprocedure: web-server/dispatchers/dispatch-pathprocedure) + (prefix-in sequencer: web-server/dispatchers/dispatch-sequencer) + (prefix-in lift: web-server/dispatchers/dispatch-lift) + (prefix-in filter: web-server/dispatchers/dispatch-filter) + (prefix-in files: web-server/dispatchers/dispatch-files) + "config.rkt" + "page-category.rkt" + "page-not-found.rkt" + "page-proxy.rkt" + "page-wiki.rkt" + "page-search.rkt") + +(define mime-types + (hash #".css" #"text/css" + #".svg" #"image/svg+xml")) + +(serve/launch/wait + #:port (config-get 'port) + (λ (quit) + (sequencer:make + (pathprocedure:make "/proxy" page-proxy) + (filter:make #rx"^/[a-z-]+/wiki/Category:.+$" (lift:make page-category)) + (filter:make #rx"^/[a-z-]+/wiki/.+$" (lift:make page-wiki)) + (filter:make #rx"^/[a-z-]+/search$" (lift:make page-search)) + (filter:make #rx"^/static/" (files:make + #:url->path + (lambda (u) + ((make-url->path "../static") + (struct-copy url u [path (cdr (url-path u))]))) + #:path->mime-type + (lambda (u) + (hash-ref mime-types (path-get-extension u))) + #:cache-no-cache (config-get 'debug) #;"browser applies heuristics if unset")) + (lift:make page-not-found)))) diff --git a/src/typed-rackunit.rkt b/src/typed-rackunit.rkt new file mode 100644 index 0000000..1d94d44 --- /dev/null +++ b/src/typed-rackunit.rkt @@ -0,0 +1,11 @@ +#lang typed/racket/base + +(provide + check-equal? + check-true + check-false) + +(require/typed rackunit + [check-equal? (Any Any -> Void)] + [check-true (Any -> Void)] + [check-false (Any -> Void)]) diff --git a/src/url-utils.rkt b/src/url-utils.rkt new file mode 100644 index 0000000..f563b69 --- /dev/null +++ b/src/url-utils.rkt @@ -0,0 +1,71 @@ +#lang typed/racket/base +(require racket/string + "pure-utils.rkt") + +(provide + ; make a query string from an association list of strings + params->query + ; make a proxied version of a fandom url + u-proxy-url + ; check whether a url is on a domain controlled by fandom + is-fandom-url?) + +(module+ test + (require "typed-rackunit.rkt")) + +;; https://url.spec.whatwg.org/#urlencoded-serializing + +(define urlencoded-set '(#\! #\' #\( #\) #\~ ; urlencoded set + #\$ #\% #\& #\+ #\, ; component set + #\/ #\: #\; #\= #\@ #\[ #\\ #\] #\^ #\| ; userinfo set + #\? #\` #\{ #\} ; path set + #\ #\" #\# #\< #\> ; query set + ; c0 controls included elsewhere + ; higher ranges included elsewhere + )) + +(: percent-encode (String (Listof Char) Boolean -> Bytes)) +(define (percent-encode value set space-as-plus) + (define b (string->bytes/utf-8 value)) + (apply bytes-append + (for/list ([char b]) : (Listof Bytes) + (cond + [(and space-as-plus (eq? char 32)) + #"+"] + [(or (member (integer->char char) set) + (char . > . #x7E) + (char . <= . #x1F)) + (bytes-append #"%" (string->bytes/latin-1 + (string-upcase (number->string char 16))))] + [#t + (bytes char)])))) + +(: params->query ((Listof (Pair String String)) -> String)) +(define (params->query params) + (string-join + (map (λ ([p : (Pair String String)]) + (format "~a=~a" + (percent-encode (car p) urlencoded-set #t) + (percent-encode (cdr p) urlencoded-set #t))) + params) + "&")) +(module+ test + (check-equal? (params->query '(("hello" . "world"))) + "hello=world") + (check-equal? (params->query '(("a" . "hello world''") ("utf8" . "✓"))) + "a=hello+world%27%27&utf8=%E2%9C%93")) + +(: is-fandom-url? (String -> Boolean)) +(define (is-fandom-url? url) + (regexp-match? #rx"^https://static.wikia.nocookie.net/|^https://[a-z-]*.fandom.com/" url)) +(module+ test + (check-true (is-fandom-url? "https://static.wikia.nocookie.net/wikiname/images/2/2f/SomeImage.jpg/revision/latest?cb=20110210094136")) + (check-true (is-fandom-url? "https://test.fandom.com/wiki/Some_Page")) + (check-false (is-fandom-url? "https://cadence.moe"))) + +(: u-proxy-url (String -> String)) +(define (u-proxy-url url) + (u + is-fandom-url? + (λ ([v : String]) (string-append "/proxy?" (params->query `(("dest" . ,url))))) + url)) diff --git a/src/xexpr-utils.rkt b/src/xexpr-utils.rkt new file mode 100644 index 0000000..a6bf1ca --- /dev/null +++ b/src/xexpr-utils.rkt @@ -0,0 +1,200 @@ +#lang racket/base +(require racket/dict + racket/function + racket/generator + racket/match + racket/string + (only-in json-pointer json-pointer-value) + (only-in web-server/http response/output) + "pure-utils.rkt") + +(provide + ;; with whole xexprs + ; xexpr for an "empty" element, which in reality uses