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net/url-string: support URLs that contain IPv6 literals

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Since an IPv6 literal address includes ":"s, it must be written
between "[" and "]" as a host name.

Based on a patch by @Phlosioneer and comments by @Blaisorblade,
with additional changes to make `url->string` work.

Closes #980
Closes #1243
This commit is contained in:
Matthew Flatt 2016-04-16 21:15:52 -06:00
parent 8993398033
commit 53ffad767b
1 changed files with 26 additions and 11 deletions
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37
racket/collects/net/url-string.rkt
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@ -58,7 +58,11 @@
(if (or user host port)
(sa "//"
(if user (sa (uri-userinfo-encode user) "@") null)
(if host host null)
(if host
(if (regexp-match? rx:ipv6-hex host)
(sa "[" host "]")
host)
null)
(if port (sa ":" (number->string port)) null))
(if (equal? "file" scheme) ; always need "//" for "file" URLs
'("//")
@ -161,8 +165,14 @@
(if (char=? (string-ref string 0) #\/) "file" "http"))
url])))
;; Approximation to IPv6 literal addresses, to be recognized
;; in "[...]" when decoding and put back in "[...]" when encoding;
;; having at least one ":" distinguishes from other address forms:
(define ipv6-hex "[0-9a-fA-F:]*:[0-9a-fA-F:]*")
(define rx:ipv6-hex (regexp (string-append "^" ipv6-hex "$")))
;; URL parsing regexp
;; this is following the regexp in Appendix B of rfc 3986, except for using
;; this is roughly following the regexp in Appendix B of rfc 3986, except for using
;; `*' instead of `+' for the scheme part (it is checked later anyway, and
;; we don't want to parse it as a path element), and the user@host:port is
;; parsed here.
@ -176,17 +186,22 @@
"(?:" ; | / user-at-opt
"([^/?#@]*)" ; | | #2 = user-opt
"@)?" ; | \
"([^/?#:]*)?" ; | #3 = host-opt
"(?:" ;
"(?:\\[" ; | / #3 = ipv6-host-opt
"(" ipv6-hex ")" ; | | hex-addresses
"\\])|" ; | \
"([^/?#:]*)" ; | #4 = host-opt
")?" ;
"(?::" ; | / colon-port-opt
"([0-9]*)" ; | | #4 = port-opt
"([0-9]*)" ; | | #5 = port-opt
")?" ; | \
")?" ; \
"([^?#]*)" ; #5 = path
"([^?#]*)" ; #6 = path
"(?:\\?" ; / question-query-opt
"([^#]*)" ; | #6 = query-opt
"([^#]*)" ; | #7 = query-opt
")?" ; \
"(?:#" ; / hash-fragment-opt
"(.*)" ; | #7 = fragment-opt
"(.*)" ; | #8 = fragment-opt
")?" ; \
"$")))
@ -194,7 +209,7 @@
;; Original version by Neil Van Dyke
(define (string->url str)
(apply
(lambda (scheme user host port path query fragment)
(lambda (scheme user ipv6host 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))
@ -214,9 +229,9 @@
(define win-file-url (and win-file?
(path->url (bytes->path (string->bytes/utf-8 path) 'windows))))
(let* ([scheme (and scheme (string-downcase scheme))]
[host (if win-file-url
(url-host win-file-url)
(and host (string-downcase host)))]
[host (cond [win-file-url (url-host win-file-url)]
[ipv6host (and ipv6host (string-downcase ipv6host))]
[else (and host (string-downcase host))])]
[user (uri-decode/maybe user)]
[port (and port (string->number port))]
[abs? (or (equal? "file" scheme)