breezewiki/src/page-static.rkt

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#lang racket/base
(require racket/path
racket/runtime-path
net/url
web-server/http/request-structs
web-server/servlet-dispatch
web-server/dispatchers/filesystem-map
(only-in web-server/dispatchers/dispatch next-dispatcher)
(prefix-in files: web-server/dispatchers/dispatch-files)
"config.rkt")
(provide
static-dispatcher)
(module+ test
(require rackunit))
(define-runtime-path path-static "../static")
(define hash-ext-mime-type
(hash #".css" #"text/css"
#".png" #"image/png"
#".svg" #"image/svg+xml"
#".txt" #"text/plain"))
(define (ext->mime-type ext)
(hash-ref hash-ext-mime-type ext))
(module+ test
(check-equal? (ext->mime-type #".png") #"image/png"))
(define (make-path segments)
(map (λ (seg) (path/param seg '())) segments))
(module+ test
(check-equal? (make-path '("static" "main.css"))
(list (path/param "static" '()) (path/param "main.css" '()))))
(define (path-rewriter p)
(cond
; url is ^/static/... ?
[(equal? (path/param-path (car p)) "static")
; rewrite to ^/... which will be treated as relative to static/ on the filesystem
(cdr p)]
; url is literally ^/robots.txt
[(equal? p (make-path '("robots.txt")))
; rewrite to ^/... -- it already is!
p]
; not going to use the static file dispatcher
[#t (next-dispatcher)]))
(module+ test
(check-equal? (path-rewriter (make-path '("static" "main.css")))
(make-path '("main.css")))
(check-equal? (path-rewriter (make-path '("static" "robots.txt")))
(make-path '("robots.txt")))
(check-equal? (path-rewriter (make-path '("robots.txt")))
(make-path '("robots.txt"))))
(define (static-dispatcher conn old-req)
(define old-uri (request-uri old-req))
(define old-path (url-path old-uri))
(define new-path (path-rewriter old-path))
(define new-uri (struct-copy url old-uri [path new-path]))
(define new-req (struct-copy request old-req [uri new-uri]))
((files:make
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#:url->path (lambda (u) ((make-url->path path-static) u))
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#:path->mime-type (lambda (u) (ext->mime-type (path-get-extension u)))
#:cache-no-cache (config-true? 'debug) #;"browser applies heuristics if unset")
conn new-req))