breezewiki/src/application-globals.rkt

#lang racket/base
(require racket/string
         json
         (prefix-in easy: net/http-easy)
         html-writing
         web-server/http
         "config.rkt"
         "data.rkt"
         "xexpr-utils.rkt"
         "url-utils.rkt")

(provide
 ; headers to always send on all http responses
 always-headers
 ; timeout durations for http-easy requests
 timeouts
 ; generates a consistent footer
 application-footer
 ; generates a consistent template for wiki page content to sit in
 generate-wiki-page
 ; generates a minimal but complete redirect to another page
 generate-redirect)

(module+ test
  (require rackunit
           html-writing))

(define always-headers
  (list (header #"Referrer-Policy" #"same-origin"))) ; header to not send referers to fandom
(define timeouts (easy:make-timeout-config #:lease 5 #:connect 5))

(define (application-footer source-url #:license [license-in #f])
  (define license (or license-in license-default))
  `(footer (@ (class "custom-footer"))
           (div (@ (class ,(if source-url "custom-footer__cols" "internal-footer")))
                (div (p
                      (img (@ (class "my-logo") (src "/static/breezewiki.svg"))))
                     (p
                      (a (@ (href "https://gitdab.com/cadence/breezewiki"))
                         ,(format "~a source code" (config-get 'application_name))))
                     (p
                      (a (@ (href "https://docs.breezewiki.com"))
                         "Documentation and more information"))
                     (p
                      (a (@ (href "https://lists.sr.ht/~cadence/breezewiki-discuss"))
                         "Discussions / Bug reports / Feature requests"))
                     ,(if (config-true? '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 controlled by the code developer." (config-get 'application_name)))))
                ,(if source-url
                     `(div (p "This page displays proxied content from "
                              (a (@ (href ,source-url) (rel "noreferrer")) ,source-url)
                              ,(format ". Text content is available under the ~a license, " (license^-text license))
                              (a (@ (href ,(license^-url license))) "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))))
                     `(div (p "Text content on wikis run by Fandom 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 and official Fandom documents have different copying restrictions.")
                           (p ,(format "Fandom is a trademark of Fandom, Inc. ~a is not affiliated with Fandom." (config-get 'application_name))))))))

(define (generate-wiki-page
         content
         #:source-url source-url
         #:wikiname wikiname
         #:title title
         #:body-class [body-class-in #f]
         #:siteinfo [siteinfo-in #f])
  (define siteinfo (or siteinfo-in siteinfo-default))
  (define body-class (if (not body-class-in)
                         "skin-fandomdesktop"
                         body-class-in))
  (define (required-styles origin)
    (map (λ (dest-path)
           (define url (format dest-path origin))
           (if (config-true? 'strict_proxy)
               (u-proxy-url url)
               url))
         '(#;"~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/wikia.php?controller=ThemeApi&method=themeVariables"
           "~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")))
  `(html
    (head
     (meta (@ (name "viewport") (content "width=device-width, initial-scale=1")))
     (title ,(format "~a | ~a+~a"
                     title
                     (regexp-replace #rx" ?Wiki$" (siteinfo^-sitename siteinfo) "")
                     (config-get 'application_name)))
     ,@(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")))
     (script "const BWData = "
             ,(jsexpr->string (hasheq 'wikiname wikiname
                                      'strict_proxy (config-true? 'strict_proxy))))
     ,(if (config-true? 'feature_search_suggestions)
          '(script (@ (type "module") (src "/static/search-suggestions.js")))
          ""))
    (body (@ (class ,body-class))
          (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))
                                             (class "bw-search-form")
                                             (id "bw-pr-search-form"))
                                          (label (@ (for "bw-search-input")) "Search ")
                                          (div (@ (id "bw-pr-search-input"))
                                               (input (@ (type "text") (name "q") (id "bw-search-input") (autocomplete "off"))))
                                          (div (@ (class "bw-ss__container") (id "bw-pr-search-suggestions"))))))
                          (div (@ (id "content") #;(class "page-content"))
                               (div (@ (id "mw-content-text"))
                                    ,content))
                          ,(application-footer source-url #:license (siteinfo^-license siteinfo))))))))
(module+ test
  (define page
    (parameterize ([(config-parameter 'strict_proxy) "true"])
      (generate-wiki-page
       '(template)
       #:source-url ""
       #:title "test"
       #:wikiname "test")))
  ; check the page is a valid xexp
  (check-not-false (xexp->html page))
  ; check the stylesheet is proxied
  (check-true (string-prefix?
               (get-attribute 'href
                              (bits->attributes
                               ((query-selector
                                 (λ (t a c) (eq? t 'link))
                                 page))))
               "/proxy?dest=https%3A%2F%2Ftest.fandom.com")))

(define (generate-redirect dest)
  (define dest-bytes (string->bytes/utf-8 dest))
  (response/output
   #:code 302
   #:headers (list (header #"Location" dest-bytes))
   (λ (out)
     (write-html
      `(html
        (head
         (title "Redirecting..."))
        (body
         "Redirecting to "
         (a (@ (href ,dest)) ,dest)
         "..."))
      out))))