107 lines
4.2 KiB
Racket
107 lines
4.2 KiB
Racket
#lang racket/base
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(require net/url
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net/url-connect
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racket/file
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racket/path
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racket/port
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"config.rkt")
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(provide vendor-files
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vendor-files-ready?
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download-vendor-files!)
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(define vendor-files
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(list
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(cons "font-awesome/css/font-awesome.min.css"
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"https://cdn.jsdelivr.net/npm/font-awesome@4.7.0/css/font-awesome.min.css")
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(cons "font-awesome/fonts/fontawesome-webfont.woff2"
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"https://cdn.jsdelivr.net/npm/font-awesome@4.7.0/fonts/fontawesome-webfont.woff2")
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(cons "easymde.min.js"
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"https://cdn.jsdelivr.net/npm/easymde@2.21.0/dist/easymde.min.js")
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(cons "easymde.min.css"
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"https://cdn.jsdelivr.net/npm/easymde@2.21.0/dist/easymde.min.css")
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(cons "purify.min.js"
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"https://cdn.jsdelivr.net/npm/dompurify@3.4.13/dist/purify.min.js")
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(cons "highlight.min.js"
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"https://cdn.jsdelivr.net/gh/highlightjs/cdn-release@11.12.0/build/highlight.min.js")
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(cons "highlight-scheme.min.js"
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"https://cdn.jsdelivr.net/gh/highlightjs/cdn-release@11.12.0/build/languages/scheme.min.js")
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(cons "highlight-github.min.css"
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"https://cdn.jsdelivr.net/gh/highlightjs/cdn-release@11.12.0/build/styles/github.min.css")
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(cons "diff2html-ui-base.min.js"
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"https://cdn.jsdelivr.net/npm/diff2html@3.4.56/bundles/js/diff2html-ui-base.min.js")
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(cons "diff2html.min.css"
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"https://cdn.jsdelivr.net/npm/diff2html@3.4.56/bundles/css/diff2html.min.css")))
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(define (vendor-file-ready? config name)
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(define path (build-path (vendor-directory config) name))
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(and (file-exists? path)
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(> (file-size path) 0)))
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; goal : Check whether all required browser libraries are installed.
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; pre : config is a wiki-config value.
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; post : Vendor files have only been inspected.
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; result : #t when every required vendor file exists and is non-empty,
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; otherwise #f.
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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(define (vendor-files-ready? config)
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(for/and ([entry (in-list vendor-files)])
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(vendor-file-ready? config (car entry))))
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(define (download-content source)
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(parameterize ((current-https-protocol 'secure))
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(define-values (in headers)
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(get-pure-port/headers (string->url source)
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'()
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#:redirections 5
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#:status? #t))
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(dynamic-wind
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void
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(λ ()
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(define status-match
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(regexp-match #px"^HTTP/[^ ]+ ([0-9][0-9][0-9])" headers))
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(unless (and status-match
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(= (string->number (list-ref status-match 1)) 200))
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(error 'download-vendor-files!
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"download failed for ~a: ~a"
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source
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(or (and status-match (list-ref status-match 1))
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"invalid HTTP status")))
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(port->bytes in))
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(λ ()
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(close-input-port in)))))
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(define (download-file! config name source)
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(define directory (vendor-directory config))
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(define target (build-path directory name))
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(define temporary-target
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(build-path directory (string-append name ".download")))
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(define content (download-content source))
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(make-directory* (path-only target))
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(call-with-output-file temporary-target
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(λ (out)
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(write-bytes content out))
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#:exists 'truncate/replace)
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(rename-file-or-directory temporary-target target #t)
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(void))
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; goal : Download all browser libraries required by the wiki frontend.
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; pre : config identifies a writable data directory and outbound HTTPS is
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; available for the configured vendor URLs.
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; post : Every required vendor file is stored below data/static/vendor.
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; result : void.
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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(define (download-vendor-files! config)
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(make-directory* (vendor-directory config))
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(for ([entry (in-list vendor-files)])
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(define name (car entry))
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(define source (cdr entry))
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(unless (vendor-file-ready? config name)
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(download-file! config name source)))
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(unless (vendor-files-ready? config)
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(error 'download-vendor-files! "frontend vendor setup is incomplete"))
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(void))
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