/usr/share/racket/collects/net/url-string.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/string
racket/contract/base
racket/list
"url-structs.rkt"
"url-exception.rkt"
"uri-codec.rkt")
;; 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 file-url-path-convention-type (make-parameter (system-path-convention-type)))
(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))))
(define (url->string url)
(let ([scheme (url-scheme url)]
[user (url-user url)]
[host (url-host url)]
[port (url-port url)]
[path (url-path url)]
[query (url-query url)]
[fragment (url-fragment url)]
[sa list]
[sa* (lambda (l)
(apply string-append
(let loop ([l l])
(cond
[(null? l) l]
[(pair? (car l))
(append (loop (car l))
(loop (cdr l)))]
[(null? (car l)) (loop (cdr l))]
[else (cons (car l) (loop (cdr l)))]))))])
(when (and (equal? scheme "file")
(not (url-path-absolute? url)))
(raise-mismatch-error 'url->string
"cannot convert relative file URL to a string: "
url))
(sa*
(append
(if scheme (sa scheme ":") null)
(if (or user host port)
(sa "//"
(if user (sa (uri-userinfo-encode user) "@") null)
(if host host null)
(if port (sa ":" (number->string port)) null))
(if (equal? "file" scheme) ; always need "//" for "file" URLs
'("//")
null))
(combine-path-strings (url-path-absolute? url) path)
;; (if query (sa "?" (uri-encode query)) "")
(if (null? query) null (sa "?" (alist->form-urlencoded query)))
(if fragment (sa "#" (uri-encode* fragment)) null)))))
;; transliteration of code in rfc 3986, section 5.2.2
(define (combine-url/relative Base string)
(let ([R (string->url string)]
[T (make-url #f #f #f #f #f '() '() #f)])
(if (url-scheme R)
(begin
(set-url-scheme! T (url-scheme R))
(set-url-user! T (url-user R)) ;; authority
(set-url-host! T (url-host R)) ;; authority
(set-url-port! T (url-port R)) ;; authority
(set-url-path-absolute?! T (url-path-absolute? R))
(set-url-path! T (remove-dot-segments (url-path R)))
(set-url-query! T (url-query R)))
(begin
(if (url-host R) ;; => authority is defined
(begin
(set-url-user! T (url-user R)) ;; authority
(set-url-host! T (url-host R)) ;; authority
(set-url-port! T (url-port R)) ;; authority
(set-url-path-absolute?! T (url-path-absolute? R))
(set-url-path! T (remove-dot-segments (url-path R)))
(set-url-query! T (url-query R)))
(begin
(if (null? (url-path R)) ;; => R has empty path
(begin
(set-url-path-absolute?! T (url-path-absolute? Base))
(set-url-path! T (url-path Base))
(if (not (null? (url-query R)))
(set-url-query! T (url-query R))
(set-url-query! T (url-query Base))))
(begin
(cond
[(url-path-absolute? R)
(set-url-path-absolute?! T #t)
(set-url-path! T (remove-dot-segments (url-path R)))]
[(and (null? (url-path Base))
(url-host Base))
(set-url-path-absolute?! T #t)
(set-url-path! T (remove-dot-segments (url-path R)))]
[else
(set-url-path-absolute?! T (url-path-absolute? Base))
(set-url-path! T (remove-dot-segments
(append (all-but-last (url-path Base))
(url-path R))))])
(set-url-query! T (url-query R))))
(set-url-user! T (url-user Base)) ;; authority
(set-url-host! T (url-host Base)) ;; authority
(set-url-port! T (url-port Base)))) ;; authority
(set-url-scheme! T (url-scheme Base))))
(set-url-fragment! T (url-fragment R))
T))
(define (all-but-last lst)
(cond [(null? lst) null]
[(null? (cdr lst)) null]
[else (cons (car lst) (all-but-last (cdr lst)))]))
;; cribbed from 5.2.4 in rfc 3986
;; the strange [*] cases implicitly change urls
;; with paths segments "." and ".." at the end
;; into "./" and "../" respectively
(define (remove-dot-segments path)
(let loop ([path path] [result '()])
(if (null? path)
(reverse result)
(let ([fst (path/param-path (car path))]
[rst (cdr path)])
(loop rst
(cond
[(and (eq? fst 'same) (null? rst))
(cons (make-path/param "" '()) result)] ; [*]
[(eq? fst 'same)
result]
[(and (eq? fst 'up) (null? rst) (not (null? result)))
(cons (make-path/param "" '()) (cdr result))] ; [*]
[(and (eq? fst 'up) (not (null? result)))
(cdr result)]
[(and (eq? fst 'up) (null? result))
;; when we go up too far, just drop the "up"s.
result]
[else
(cons (car path) result)]))))))
;; netscape/string->url : str -> url
(define (netscape/string->url string)
(let ([url (string->url string)])
(cond [(url-scheme url) url]
[(string=? string "")
(url-error "Can't resolve empty string as URL")]
[else (set-url-scheme! url
(if (char=? (string-ref string 0) #\/) "file" "http"))
url])))
;; URL parsing regexp
;; this is following the regexp in Appendix B of rfc 3986, except for using
;; `*' instead of `+' for the scheme part (it is checked later anyway, and
;; we don't want to parse it as a path element), and the user@host:port is
;; parsed here.
(define url-regexp
(regexp (string-append
"^"
"(?:" ; / scheme-colon-opt
"([^:/?#]*)" ; | #1 = scheme-opt
":)?" ; \
"(?://" ; / slash-slash-authority-opt
"(?:" ; | / user-at-opt
"([^/?#@]*)" ; | | #2 = user-opt
"@)?" ; | \
"([^/?#:]*)?" ; | #3 = host-opt
"(?::" ; | / colon-port-opt
"([0-9]*)" ; | | #4 = port-opt
")?" ; | \
")?" ; \
"([^?#]*)" ; #5 = path
"(?:\\?" ; / question-query-opt
"([^#]*)" ; | #6 = query-opt
")?" ; \
"(?:#" ; / hash-fragment-opt
"(.*)" ; | #7 = fragment-opt
")?" ; \
"$")))
;; string->url : str -> url
;; Original version by Neil Van Dyke
(define (string->url str)
(apply
(lambda (scheme user host port path query fragment)
(when (and scheme (not (regexp-match? #rx"^[a-zA-Z][a-zA-Z0-9+.-]*$"
scheme)))
(url-error "Invalid URL string; bad scheme ~e: ~e" scheme str))
;; Windows => "file://xxx:/...." specifies a "xxx:/..." path
(let ([win-file? (and (or (equal? "" port) (not port))
(equal? "file" scheme)
(eq? 'windows (file-url-path-convention-type))
(not (equal? host "")))])
(when win-file?
(set! path (cond [(equal? "" port) (string-append host ":" path)]
[(and path host) (string-append host "/" path)]
[else (or path host)]))
(set! port #f)
(set! host ""))
(let* ([scheme (and scheme (string-downcase scheme))]
[host (and host (string-downcase host))]
[user (uri-decode/maybe user)]
[port (and port (string->number port))]
[abs? (or (equal? "file" scheme)
(regexp-match? #rx"^/" path))]
[path (if win-file?
(separate-windows-path-strings path)
(separate-path-strings path))]
[query (if query (form-urlencoded->alist query) '())]
[fragment (uri-decode/maybe fragment)])
(make-url scheme user host port abs? path query fragment))))
(cdr (regexp-match url-regexp str))))
(define (uri-decode/maybe f) (friendly-decode/maybe f uri-decode))
(define (friendly-decode/maybe f uri-decode)
;; If #f, and leave unmolested any % that is followed by hex digit
;; if a % is not followed by a hex digit, replace it with %25
;; in an attempt to be "friendly"
(and f (uri-decode (regexp-replace* #rx"%([^0-9a-fA-F])" f "%25\\1"))))
;; separate-path-strings : string[starting with /] -> (listof path/param)
(define (separate-path-strings str)
(let ([strs (regexp-split #rx"/" str)])
(map separate-params (if (string=? "" (car strs)) (cdr strs) strs))))
(define (separate-windows-path-strings str)
(url-path (path->url (bytes->path (string->bytes/utf-8 str) 'windows))))
(define (separate-params s)
(let ([lst (map path-segment-decode (regexp-split #rx";" s))])
(make-path/param (car lst) (cdr lst))))
(define (path-segment-decode p)
(cond [(string=? p "..") 'up]
[(string=? p ".") 'same]
[else (uri-path-segment-decode p)]))
(define (path-segment-encode p)
(cond [(eq? p 'up) ".."]
[(eq? p 'same) "."]
[(equal? p "..") "%2e%2e"]
[(equal? p ".") "%2e"]
[else (uri-path-segment-encode* p)]))
(define (combine-path-strings absolute? path/params)
(cond [(null? path/params) null]
[else (let ([p (add-between (map join-params path/params) "/")])
(if absolute? (cons "/" p) p))]))
(define (join-params s)
(if (null? (path/param-param s))
(path-segment-encode (path/param-path s))
(string-join (map path-segment-encode
(cons (path/param-path s) (path/param-param s)))
";")))
(define (path->url path)
(let* ([spath (simplify-path path #f)]
[dir? (let-values ([(b n dir?) (split-path spath)]) dir?)]
;; If original path is a directory the resulting URL
;; should have a trailing forward slash
[url-tail (if dir? (list (make-path/param "" null)) null)]
[url-path
(let loop ([path spath][accum null])
(let-values ([(base name dir?) (split-path path)])
(cond
[(not base)
(if (eq? (path-convention-type path) 'windows)
;; For Windows, massage the root:
(append (map
(lambda (s)
(make-path/param s null))
(let ([s (regexp-replace
#rx"[/\\\\]$"
(bytes->string/utf-8 (path->bytes name))
"")])
(cond
[(regexp-match? #rx"^\\\\\\\\[?]\\\\[a-zA-Z]:" s)
;; \\?\<drive>: path:
(regexp-split #rx"[/\\]+" (substring s 4))]
[(regexp-match? #rx"^\\\\\\\\[?]\\\\UNC" s)
;; \\?\ UNC path:
(regexp-split #rx"[/\\]+" (substring s 7))]
[(regexp-match? #rx"^[/\\]" s)
;; UNC path:
(regexp-split #rx"[/\\]+" s)]
[else
(list s)])))
accum)
;; On other platforms, we drop the root:
accum)]
[else
(let ([accum (cons (make-path/param
(if (symbol? name)
name
(bytes->string/utf-8
(path-element->bytes name)))
null)
accum)])
(if (eq? base 'relative)
accum
(loop base accum)))])))])
(make-url "file" #f "" #f (absolute-path? path)
(if (null? url-tail) url-path (append url-path url-tail))
'() #f)))
(define (file://->path url [kind (system-path-convention-type)])
(let ([strs (map path/param-path (url-path url))]
[string->path-element/same
(lambda (e)
(if (symbol? e)
e
(if (string=? e "")
'same
(bytes->path-element (string->bytes/locale e) kind))))]
[string->path/win (lambda (s)
(bytes->path (string->bytes/utf-8 s) 'windows))])
(if (and (url-path-absolute? url)
(eq? 'windows kind))
;; If initial path is "", then build UNC path.
(cond
[(not (url-path-absolute? url))
(apply build-path (map string->path-element/same strs))]
[(and ((length strs) . >= . 3)
(equal? (car strs) ""))
(apply build-path
(string->path/win
(string-append "\\\\" (cadr strs) "\\" (caddr strs) "\\"))
(map string->path-element/same (cdddr strs)))]
[(pair? strs)
(apply build-path (string->path/win (car strs))
(map string->path-element/same (cdr strs)))]
[else (error 'file://->path "no path elements: ~e" url)])
(let ([elems (map string->path-element/same strs)])
(if (url-path-absolute? url)
(apply build-path (bytes->path #"/" 'unix) elems)
(apply build-path elems))))))
(define (url->path url [kind (system-path-convention-type)])
(file://->path url kind))
(define (relative-path->relative-url-string path)
(define s (string-join (for/list ([e (in-list (explode-path path))])
(cond
[(eq? e 'same) "."]
[(eq? e 'up) ".."]
[else
(uri-encode* (path-element->string e))]))
"/"))
;; Add "/" to reflect directory-ness:
(let-values ([(base name dir?) (split-path path)])
(if dir?
(string-append s "/")
s)))
(define current-url-encode-mode (make-parameter 'recommended))
(define (uri-encode* str)
(case (current-url-encode-mode)
[(unreserved) (uri-unreserved-encode str)]
[(recommended) (uri-encode str)]))
(define (uri-path-segment-encode* str)
(case (current-url-encode-mode)
[(unreserved) (uri-path-segment-unreserved-encode str)]
[(recommended) (uri-path-segment-encode str)]))
(provide (struct-out url) (struct-out path/param))
(provide/contract
(string->url (-> (and/c string?
(or/c #rx"^[a-zA-Z][a-zA-Z0-9+.-]*:"
(not/c #rx"^[^:/?#]*:")))
url?))
(path->url ((or/c path-string? path-for-some-system?) . -> . url?))
(relative-path->relative-url-string ((and/c (or/c path-string? path-for-some-system?)
relative-path?)
. -> . string?))
(url->string (url? . -> . string?))
(url->path (->* (url?) ((one-of/c 'unix 'windows)) path-for-some-system?))
(file://->path (->* (url?) ((one-of/c 'unix 'windows)) path-for-some-system?))
(netscape/string->url (string? . -> . url?))
(combine-url/relative (url? string? . -> . url?))
(rename -url-exception? url-exception? (any/c . -> . boolean?))
(file-url-path-convention-type
(parameter/c (one-of/c 'unix 'windows)))
(current-url-encode-mode (parameter/c (one-of/c 'recommended 'unreserved))))
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