/usr/share/racket/collects/net/url.rkt is in racket-common 6.3-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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(require racket/port
racket/string
racket/contract/base
racket/list
racket/match
(prefix-in hc: "http-client.rkt")
(only-in "url-connect.rkt" current-https-protocol)
"uri-codec.rkt"
"url-string.rkt"
(only-in "url-exception.rkt" make-url-exception))
;; To do:
;; Handle HTTP/file errors.
;; Not throw away MIME headers.
;; Determine file type.
(define-logger net/url)
;; ----------------------------------------------------------------------
;; Input ports have two statuses:
;; "impure" = they have text waiting
;; "pure" = the MIME headers have been read
(define current-proxy-servers
(make-parameter null
(lambda (v)
(unless (and (list? v)
(andmap (lambda (v)
(and (list? v)
(= 3 (length v))
(equal? (car v) "http")
(string? (car v))
(exact-integer? (caddr v))
(<= 1 (caddr v) 65535)))
v))
(raise-type-error
'current-proxy-servers
"list of list of scheme, string, and exact integer in [1,65535]"
v))
(map (lambda (v)
(list (string->immutable-string (car v))
(string->immutable-string (cadr v))
(caddr v)))
v))))
(define (url-error fmt . args)
(raise (make-url-exception
(apply format fmt
(map (lambda (arg) (if (url? arg) (url->string arg) arg))
args))
(current-continuation-marks))))
;; url->default-port : url -> num
(define (url->default-port url)
(let ([scheme (url-scheme url)])
(cond [(not scheme) 80]
[(string=? scheme "http") 80]
[(string=? scheme "https") 443]
[else (url-error "URL scheme ~s not supported" scheme)])))
;; make-ports : url -> hc
(define (make-ports url proxy)
(let ([port-number (if proxy
(caddr proxy)
(or (url-port url) (url->default-port url)))]
[host (if proxy (cadr proxy) (url-host url))])
(hc:http-conn-open host
#:port port-number
#:ssl? (if (equal? "https" (url-scheme url))
(current-https-protocol)
#f))))
;; http://getpost-impure-port : bool x url x union (str, #f) x list (str)
;; -> hc
(define (http://getpost-impure-port get? url post-data strings
make-ports 1.1?)
(define proxy (assoc (url-scheme url) (current-proxy-servers)))
(define hc (make-ports url proxy))
(define access-string
(url->string
(if proxy
url
;; RFCs 1945 and 2616 say:
;; Note that the absolute path cannot be empty; if none is present in
;; the original URI, it must be given as "/" (the server root).
(let-values ([(abs? path)
(if (null? (url-path url))
(values #t (list (make-path/param "" '())))
(values (url-path-absolute? url) (url-path url)))])
(make-url #f #f #f #f abs? path (url-query url) (url-fragment url))))))
(hc:http-conn-send! hc access-string
#:method (if get? "GET" "POST")
#:headers strings
#:content-decode '()
#:data post-data)
hc)
;; file://get-pure-port : url -> in-port
(define (file://get-pure-port url)
(open-input-file (file://->path url)))
(define (schemeless-url url)
(url-error "Missing protocol (usually \"http:\") at the beginning of URL: ~a" url))
;; getpost-impure-port : bool x url x list (str) -> in-port
(define (getpost-impure-port get? url post-data strings)
(let ([scheme (url-scheme url)])
(cond [(not scheme)
(schemeless-url url)]
[(or (string=? scheme "http") (string=? scheme "https"))
(define hc (http://getpost-impure-port get? url post-data strings make-ports #f))
(http-conn-impure-port hc)]
[(string=? scheme "file")
(url-error "There are no impure file: ports")]
[else (url-error "Scheme ~a unsupported" scheme)])))
(define (http-conn-impure-port hc)
(define-values (in out) (make-pipe 4096))
(define-values (status headers response-port)
(hc:http-conn-recv! hc #:close? #t #:content-decode '()))
(fprintf out "~a\r\n" status)
(for ([h (in-list headers)])
(fprintf out "~a\r\n" h))
(fprintf out "\r\n")
(thread
(λ ()
(copy-port response-port out)
(close-output-port out)))
in)
;; get-impure-port : url [x list (str)] -> in-port
(define (get-impure-port url [strings '()])
(getpost-impure-port #t url #f strings))
;; post-impure-port : url x bytes [x list (str)] -> in-port
(define (post-impure-port url post-data [strings '()])
(getpost-impure-port #f url post-data strings))
;; getpost-pure-port : bool x url x list (str) -> in-port
(define (getpost-pure-port get? url post-data strings redirections)
(let ([scheme (url-scheme url)])
(cond [(not scheme)
(schemeless-url url)]
[(or (string=? scheme "http")
(string=? scheme "https"))
(cond
[(or (not get?)
;; do not follow redirections for POST
(zero? redirections))
(define-values (status headers response-port)
(hc:http-conn-recv!
(http://getpost-impure-port
get? url post-data strings
make-ports #f)
#:content-decode '()
#:close? #t))
response-port]
[else
(define-values (port header)
(get-pure-port/headers url strings #:redirections redirections))
port])]
[(string=? scheme "file")
(file://get-pure-port url)]
[else (url-error "Scheme ~a unsupported" scheme)])))
(define (make-http-connection)
(hc:http-conn))
(define (http-connection-close hc)
(hc:http-conn-close! hc))
(define (get-pure-port/headers url [strings '()]
#:redirections [redirections 0]
#:status? [status? #f]
#:connection [conn #f])
(let redirection-loop ([redirections redirections] [url url] [use-conn conn])
(define hc
(http://getpost-impure-port #t url #f strings
(if (and use-conn
(hc:http-conn-live? use-conn))
(lambda (url proxy)
(log-net/url-debug "reusing connection")
use-conn)
make-ports)
(and conn #t)))
(define-values (status headers response-port)
(hc:http-conn-recv! hc #:close? (not conn) #:content-decode '()))
(define new-url
(ormap (λ (h)
(match (regexp-match #rx#"^Location: (.*)$" h)
[#f #f]
[(list _ m1b)
(define m1 (bytes->string/utf-8 m1b))
(with-handlers ((exn:fail? (λ (x) #f)))
(define next-url (string->url m1))
(make-url
(or (url-scheme next-url) (url-scheme url))
(or (url-user next-url) (url-user url))
(or (url-host next-url) (url-host url))
(or (url-port next-url) (url-port url))
(url-path-absolute? next-url)
(url-path next-url)
(url-query next-url)
(url-fragment next-url)))]))
headers))
(define redirection-status-line?
(regexp-match #rx#"^HTTP/[0-9]+[.][0-9]+ 3[0-9][0-9]" status))
(cond
[(and redirection-status-line? new-url (not (zero? redirections)))
(log-net/url-info "redirection: ~a" (url->string new-url))
(redirection-loop (- redirections 1) new-url #f)]
[else
(values response-port
(apply string-append
(map (λ (x) (format "~a\r\n" x))
(if status?
(cons status headers)
headers))))])))
;; get-pure-port : url [x list (str)] -> in-port
(define (get-pure-port url [strings '()] #:redirections [redirections 0])
(getpost-pure-port #t url #f strings redirections))
;; post-pure-port : url bytes [x list (str)] -> in-port
(define (post-pure-port url post-data [strings '()])
(getpost-pure-port #f url post-data strings 0))
;; display-pure-port : in-port -> ()
(define (display-pure-port server->client)
(copy-port server->client (current-output-port))
(close-input-port server->client))
;; call/input-url : url x (url -> in-port) x (in-port -> T)
;; [x list (str)] -> T
(define call/input-url
(let ([handle-port
(lambda (server->client handler)
(dynamic-wind (lambda () 'do-nothing)
(lambda () (handler server->client))
(lambda () (close-input-port server->client))))])
(case-lambda
[(url getter handler)
(handle-port (getter url) handler)]
[(url getter handler params)
(handle-port (getter url params) handler)])))
;; purify-port : in-port -> header-string
(define (purify-port port)
(let ([m (regexp-match-peek-positions
#rx"^HTTP/.*?(?:\r\n\r\n|\n\n|\r\r)" port)])
(if m (read-string (cdar m) port) "")))
;; purify-http-port : in-port -> in-port
(define (purify-http-port in-port)
(purify-port in-port)
in-port)
;; delete-pure-port : url [x list (str)] -> in-port
(define (delete-pure-port url [strings '()])
(method-pure-port 'delete url #f strings))
;; delete-impure-port : url [x list (str)] -> in-port
(define (delete-impure-port url [strings '()])
(method-impure-port 'delete url #f strings))
;; head-pure-port : url [x list (str)] -> in-port
(define (head-pure-port url [strings '()])
(method-pure-port 'head url #f strings))
;; head-impure-port : url [x list (str)] -> in-port
(define (head-impure-port url [strings '()])
(method-impure-port 'head url #f strings))
;; put-pure-port : url bytes [x list (str)] -> in-port
(define (put-pure-port url put-data [strings '()])
(method-pure-port 'put url put-data strings))
;; put-impure-port : url x bytes [x list (str)] -> in-port
(define (put-impure-port url put-data [strings '()])
(method-impure-port 'put url put-data strings))
;; options-pure-port : url [x list (str)] -> in-port
(define (options-pure-port url [strings '()])
(method-pure-port 'options url #f strings))
;; options-impure-port : url [x list (str)] -> in-port
(define (options-impure-port url [strings '()])
(method-impure-port 'options url #f strings))
;; method-impure-port : symbol x url x list (str) -> in-port
(define (method-impure-port method url data strings)
(let ([scheme (url-scheme url)])
(cond [(not scheme)
(schemeless-url url)]
[(or (string=? scheme "http") (string=? scheme "https"))
(http://method-impure-port method url data strings)]
[(string=? scheme "file")
(url-error "There are no impure file: ports")]
[else (url-error "Scheme ~a unsupported" scheme)])))
;; method-pure-port : symbol x url x list (str) -> in-port
(define (method-pure-port method url data strings)
(let ([scheme (url-scheme url)])
(cond [(not scheme)
(schemeless-url url)]
[(or (string=? scheme "http") (string=? scheme "https"))
(let ([port (http://method-impure-port
method url data strings)])
(purify-http-port port))]
[(string=? scheme "file")
(file://get-pure-port url)]
[else (url-error "Scheme ~a unsupported" scheme)])))
;; http://metod-impure-port : symbol x url x union (str, #f) x list (str) -> in-port
(define (http://method-impure-port method url data strings)
(let* ([method (case method
[(get) "GET"] [(post) "POST"] [(head) "HEAD"]
[(put) "PUT"] [(delete) "DELETE"] [(options) "OPTIONS"]
[else (url-error "unsupported method: ~a" method)])]
[proxy (assoc (url-scheme url) (current-proxy-servers))]
[hc (make-ports url proxy)]
[access-string (url->string
(if proxy
url
(make-url #f #f #f #f
(url-path-absolute? url)
(url-path url)
(url-query url)
(url-fragment url))))])
(hc:http-conn-send! hc access-string
#:method method
#:headers strings
#:content-decode '()
#:data data)
(http-conn-impure-port hc)))
(provide (all-from-out "url-string.rkt"))
(provide/contract
(get-pure-port (->* (url?) ((listof string?) #:redirections exact-nonnegative-integer?) input-port?))
(get-impure-port (->* (url?) ((listof string?)) input-port?))
(post-pure-port (->* (url? (or/c false/c bytes?)) ((listof string?)) input-port?))
(post-impure-port (->* (url? bytes?) ((listof string?)) input-port?))
(head-pure-port (->* (url?) ((listof string?)) input-port?))
(head-impure-port (->* (url?) ((listof string?)) input-port?))
(delete-pure-port (->* (url?) ((listof string?)) input-port?))
(delete-impure-port (->* (url?) ((listof string?)) input-port?))
(put-pure-port (->* (url? (or/c false/c bytes?)) ((listof string?)) input-port?))
(put-impure-port (->* (url? bytes?) ((listof string?)) input-port?))
(options-pure-port (->* (url?) ((listof string?)) input-port?))
(options-impure-port (->* (url?) ((listof string?)) input-port?))
(display-pure-port (input-port? . -> . void?))
(purify-port (input-port? . -> . string?))
(get-pure-port/headers (->* (url?)
((listof string?)
#:redirections exact-nonnegative-integer?
#:status? boolean?
#:connection (or/c #f hc:http-conn?))
(values input-port? string?)))
(rename hc:http-conn? http-connection? (any/c . -> . boolean?))
(make-http-connection (-> hc:http-conn?))
(http-connection-close (hc:http-conn? . -> . void?))
(call/input-url (case-> (-> url?
(-> url? input-port?)
(-> input-port? any)
any)
(-> url?
(-> url? (listof string?) input-port?)
(-> input-port? any)
(listof string?)
any)))
(current-proxy-servers
(parameter/c (or/c false/c (listof (list/c string? string? number?))))))
(define (http-sendrecv/url u
#:method [method-bss #"GET"]
#:headers [headers-bs empty]
#:data [data #f]
#:content-decode [decodes '(gzip)])
(unless (member (url-scheme u) '(#f "http" "https"))
(error 'http-sendrecv/url "URL scheme ~e not supported" (url-scheme u)))
(define ssl?
(equal? (url-scheme u) "https"))
(define port
(or (url-port u)
(if ssl?
443
80)))
(unless (url-host u)
(error 'http-sendrecv/url "Host required: ~e" u))
(hc:http-sendrecv
(url-host u)
(url->string
(make-url #f #f #f #f
(url-path-absolute? u)
(url-path u)
(url-query u)
(url-fragment u)))
#:ssl?
(if (equal? "https" (url-scheme u))
(current-https-protocol)
#f)
#:port port
#:method method-bss
#:headers headers-bs
#:data data
#:content-decode decodes))
(provide
(contract-out
[http-sendrecv/url
(->* (url?)
(#:method (or/c bytes? string? symbol?)
#:headers (listof (or/c bytes? string?))
#:data (or/c false/c bytes? string? hc:data-procedure/c)
#:content-decode (listof symbol?))
(values bytes? (listof bytes?) input-port?))]))
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