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