/usr/share/gauche-0.9/0.9.4/lib/rfc/uri.scm is in gauche 0.9.4-3.
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;;; uri.scm - parse and construct URIs
;;;
;;; Copyright (c) 2000-2014 Shiro Kawai <shiro@acm.org>
;;;
;;; Redistribution and use in source and binary forms, with or without
;;; modification, are permitted provided that the following conditions
;;; are met:
;;;
;;; 1. Redistributions of source code must retain the above copyright
;;; notice, this list of conditions and the following disclaimer.
;;;
;;; 2. Redistributions in binary form must reproduce the above copyright
;;; notice, this list of conditions and the following disclaimer in the
;;; documentation and/or other materials provided with the distribution.
;;;
;;; 3. Neither the name of the authors nor the names of its contributors
;;; may be used to endorse or promote products derived from this
;;; software without specific prior written permission.
;;;
;;; THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
;;; "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
;;; LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
;;; A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
;;; OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
;;; SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
;;; TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
;;; PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
;;; LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
;;; NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
;;; SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
;;;
;; Main reference:
;; RFC2396 Uniform Resource Identifiers (URI): Generic Syntax
;; <ftp://ftp.isi.edu/in-notes/rfc2396.txt>
;; Historical:
;; RFC1738 Uniform Resource Locators
;; <ftp://ftp.isi.edu/in-notes/rfc1738.txt>
;; RFC1808 Relative Uniform Resource Locators
;; <ftp://ftp.isi.edu/in-notes/rfc1808.txt>
;; RFC2368 The mailto URL Scheme
;; <ftp://ftp.isi.edu/in-notes/rfc2368.txt>
;; Also supports 'data' uri scheme specified in RFC2397.
(define-module rfc.uri
(use srfi-13)
(use util.match)
(use gauche.regexp)
(use gauche.charconv)
(use gauche.uvector)
(export uri-scheme&specific uri-decompose-hierarchical
uri-decompose-authority uri-parse
uri-merge uri-compose
uri-decode uri-decode-string
uri-encode uri-encode-string
*rfc2396-unreserved-char-set*
*rfc3986-unreserved-char-set*
uri-compose-data uri-decompose-data
)
)
(select-module rfc.uri)
;;==============================================================
;; Generic parser
;;
;; Splits URI scheme and the scheme specific part from given URI.
;; If URI doesn't follow the generic URI syntax, it is regarded
;; as a relative URI and #f is returned for the scheme.
;; The escaped characters of the scheme specific part is not unescaped;
;; their interpretation is dependent on the scheme.
(define (uri-scheme&specific uri)
(cond [(#/^([A-Za-z][A-Za-z0-9+.-]*):/ uri)
=> (^m (values (string-downcase (m 1)) (m 'after)))]
[else (values #f uri)]))
(define (uri-decompose-hierarchical specific)
(cond
[(and (string? specific)
(#/^(?:\/\/([^\/?#]*))?([^?#]+)?(?:\?([^#]*))?(?:#(.*))?$/ specific))
=> (^m (values (m 1) (m 2) (m 3) (m 4)))]
[else (values #f #f #f #f)]))
(define (uri-decompose-authority authority)
(cond
[(and (string? authority)
(#/^(?:(.*?)@)?([^:]*)(?::(\d*))?$/ authority))
=> (^m (values (m 1) (m 2) (m 3)))]
[else (values #f #f #f)]))
;; A common cliche (suggested by Kouhei Sutou)
;; Returns: scheme, user-info, host, port, path, query, fragment
(define (uri-parse uri)
(define (filter-non-empty-string str)
(and (string? str)
(not (string-null? str))
str))
(receive (scheme specific)
(uri-scheme&specific uri)
(receive (authority path query fragment)
(uri-decompose-hierarchical specific)
(receive (user-info host port)
(uri-decompose-authority authority)
(values scheme
user-info
(filter-non-empty-string host)
(and port (string->number port))
(filter-non-empty-string path)
query
fragment)))))
;;==============================================================
;; Generic constructor
;;
(define (uri-compose :key (scheme #f) (userinfo #f) (host #f) (port #f)
(authority #f) (path #f) (path* #f) (query #f)
(fragment #f) (specific #f))
(with-output-to-string
(^[]
(when scheme (display scheme) (display ":"))
(if specific
(display specific)
(begin
(display "//")
(if authority
(begin (display authority))
(begin
(when userinfo (display userinfo) (display "@"))
(when host (display host))
(when port (display ":") (display port))))
(if path*
(begin
(unless (string-prefix? "/" path*) (display "/"))
(display path*))
(begin
(if path
(begin (unless (string-prefix? "/" path) (display "/"))
(display path))
(display "/"))
(when query (display "?") (display query))
(when fragment (display "#") (display fragment))))
))
)))
;;==============================================================
;; Relative -> Absolute
;;
;; This function is originally implemented by teppey
;; (from http://d.hatena.ne.jp/teppey/20110517/1305613493).
;; By the author's permission I took it and modified to include here.
;; NB: CL has (merge-pathname <path> <base>). I always felt it
;; counterintuitive, since <path> is likely to be concatenated
;; after (some part of) <base>, unless <path> fully specifies all components.
;; Here we reverse the arguments, so that we can merge multiple fragments
;; of uris.
(define (uri-merge base-uri rel-uri . more)
(define (rec base-uri rel-uri more initial?)
(if (null? more)
(uri-merge-1 base-uri rel-uri initial?)
(rec (uri-merge-1 base-uri rel-uri initial?) (car more) (cdr more) #f)))
(rec base-uri rel-uri more #t))
(define (uri-merge-1 base-uri rel-uri pre-normalize?)
(define (split uri)
(receive (scheme specific)
(uri-scheme&specific uri)
(receive (authority path query fragment)
(uri-decompose-hierarchical specific)
(values scheme authority path query fragment))))
;; RFC3986, Section 5.2.3
;; we do prenormalize base-path, so it never be #f.
(define (merge base-path rel-path base-authority)
(if (and base-authority (string-null? base-path))
(string-append "/" rel-path)
(if-let1 m (#/^(.*)\/[^\/]*$/ base-path)
(string-append (m 1) "/" rel-path)
rel-path)))
;; RFC3986, Section 5.2.4
(define (canonicalize path)
(let loop ([input path] [output '()])
(cond [(not input) (string-concatenate (reverse! output))]
;; RFC3986, Section 5.2.4, 2A
[(#/^\.{1,2}\/(.*)$/ input) => (^m (loop (m 1) output))]
;; RFC3986, Section 5.2.4, 2B
[(#/^(?:\/\.\/(.*)|\/\.)$/ input)
=> (^m (loop (string-append "/" (or (m 1) "")) output))]
;; RFC3986, Section 5.2.4, 2C
[(#/^(?:\/\.\.\/(.*)|\/\.\.)$/ input)
=> (^m (loop (string-append "/" (or (m 1) ""))
(if (not (null? output)) (cdr output) output)))]
;; RFC3986, Section 5.2.4, 2D
[(#/^\.{1,2}$/ input) (loop #f output)]
;; RFC3986, Section 5.2.4, 2E
[(#/^(\/?[^\/]+)(\/.*)?$/ input)
=> (^m (loop (m 2) (cons (m 1) output)))]
[else (loop #f (cons input output))])))
;; RFC3986, Section 5.3
(define (recompose scheme authority path query fragment)
(with-output-to-string
(^[]
(when scheme (display scheme) (display ":"))
(when authority (display "//") (display authority))
(display path)
(when query (display "?") (display query))
(when fragment (display "#") (display fragment)))))
(receive (b.scheme b.authority b.path b.query b.fragment) (split base-uri)
(when pre-normalize?
(set! b.path (canonicalize b.path))) ;pre-normalization (section 5.2.1)
(receive (r.scheme r.authority r.path r.query r.fragment) (split rel-uri)
(recompose (or r.scheme b.scheme)
(if r.scheme r.authority (or r.authority b.authority))
(cond [(or r.scheme r.authority) (canonicalize r.path)]
[(not r.path) b.path]
[(string-prefix? "/" r.path) (canonicalize r.path)]
[else (canonicalize (merge b.path r.path b.authority))])
(if (or r.scheme r.authority r.path r.query) r.query b.query)
r.fragment))))
;;==============================================================
;; Encoding & decoding
;;
;; NB. Which character to encode, and when to encode/decode depend on
;; the semantics of specific URI scheme.
;; These procedures provides basic building components.
(define (uri-decode :key (cgi-decode #f))
(let loop ([c (read-char)])
(cond [(eof-object? c)]
[(char=? c #\%)
(let1 c1 (read-char)
(cond
[(eof-object? c1) (write-char c)] ;; just be permissive
[(digit->integer c1 16)
=> (^[i1]
(let1 c2 (read-char)
(cond [(eof-object? c2) (write-char c) (write-char c1)]
[(digit->integer c2 16)
=> (^[i2]
(write-byte (+ (* i1 16) i2))
(loop (read-char)))]
[else (write-char c) (write-char c1) (loop c2)])))]
[else (write-char c) (loop c1)]))]
[(char=? c #\+)
(if cgi-decode (write-char #\space) (write-char #\+))
(loop (read-char))]
[else (write-char c) (loop (read-char))])))
(define (uri-decode-string string :key (encoding (gauche-character-encoding))
:allow-other-keys args)
(define (wrap out)
(wrap-with-output-conversion out (gauche-character-encoding)
:from-code encoding))
(call-with-string-io string
(^[in out]
(with-ports in (wrap out) (current-error-port)
(^[]
(apply uri-decode args)
(close-output-port (current-output-port)))))))
;; Default set of characters that can be passed without escaping.
;; See 2.3 "Unreserved Characters" of RFC 2396. It is slightly
;; revised in RFC3986.
(define-constant *rfc2396-unreserved-char-set* #[-_.!~*'()0-9A-Za-z])
(define-constant *rfc3986-unreserved-char-set* #[-_.~0-9A-Za-z])
;; NB: Converts byte by byte, instead of chars, to avoid complexity
;; from different character encodings (suggested by Fumitoshi UKAI).
;; 'noescape' char-set is only valid in ASCII range. All bytes
;; larger than #x80 are encoded unconditionally.
(define (uri-encode :key ((:noescape echars) *rfc3986-unreserved-char-set*))
(let loop ([b (read-byte)])
(unless (eof-object? b)
(if (and (< b #x80)
(char-set-contains? echars (integer->char b)))
(write-byte b)
(format #t "%~2,'0X" b))
(loop (read-byte)))))
(define (uri-encode-string string :key (encoding (gauche-character-encoding))
:allow-other-keys args)
(define (wrap in)
(wrap-with-input-conversion in (gauche-character-encoding)
:to-code encoding))
(call-with-string-io string
(^[in out]
(with-ports (wrap in) out (current-error-port)
(cut apply uri-encode args)))))
;;==============================================================
;; Data uri scheme (rfc2397)
;;
(autoload rfc.base64
base64-encode base64-encode-string
base64-decode base64-decode-string)
(autoload gauche.vport open-input-uvector)
(autoload rfc.mime mime-parse-content-type)
(define (uri-compose-data data :key (content-type #f) (encoding #f))
(define data-is-string
(and (string? data) (not (string-incomplete? data))))
(let ([encoding (or encoding (if data-is-string 'uri 'base64))]
[content-type (or content-type
(if data-is-string
(format "text/plain;charset=~a"
(cond-expand
[gauche.ces.utf8 'utf-8]
[gauche.ces.eucjp 'euc-jp]
[gauche.ces.sjis 'shift_jis]
[gauche.ces.none 'us-ascii]))
"application/octet-stream"))])
(define (encode-by-uri)
(unless data-is-string
(error "data must be a complete string for uri-encoding data scheme:"
data))
(uri-encode-string data))
(define (encode-by-base64)
(cond [(string? data) (base64-encode-string data)]
[(u8vector? data) (with-output-to-string
(cut with-input-from-port
(open-input-uvector data)
base64-encode))]
[else
(error "data must be a string or u8vector for base64 data scheme:"
data)]))
(define (compose-content-type ct)
;; We allow (type subtype (param . value) ...) in content-type.
;; We don't use mime-compose-parameters to encode the content-type,
;; however, since it may use quoted-string for value. See section 3
;; of rfc2397 for the reason to avoid quited-string.
(if (pair? ct)
(format "~a/~a~a" (car ct) (cadr ct)
(string-join (map (^p (format "~a=~a"
(uri-encode-string (car p))
(uri-encode-string (cdr p))))
(cddr ct))
";" 'prefix))
ct))
(format "data:~a~a,~a" (compose-content-type content-type)
(if (eq? encoding 'uri) "" #`";,encoding")
(ecase encoding
[(uri) (encode-by-uri)]
[(base64) (encode-by-base64)]))))
;; Returns parsed content-type and decoded data.
;;
;; Decoded data is a string if content-type is text/*, and
;; u8vector otherwise. In case of content-type being text/*, charset
;; is recognized and ces is converted appropriately.
;; NB: We may add keyword arg to specify the return type.
;;
;; For the convenience, you can pass either full uri (with "data:")
;; or just a specific part (without "data:"). Result is undefined if you
;; pass non-data uri.
(define (uri-decompose-data uri)
(rxmatch-case uri
[#/^(?:data:)?(.*?)(\;base64)?,(.*)/ (_ ct enc data)
(match (mime-parse-content-type ct)
[(and (type subtype attrs ...) content-type)
;; TODO: If we have efficient output-to-bytevector interface,
;; we might revise this code so that we won't use intermediate string.
;; (open-output-uvector can't be used yet since output is fixed-length)
(let* ([ces (assoc-ref attrs "charset")]
[encoded (if enc
(let1 str (base64-decode-string data)
(if ces
(ces-convert str ces)
str))
(uri-decode-string data :encoding ces))])
(if (equal? type "text")
(values content-type encoded)
(values content-type (string->u8vector encoded))))]
[_ (error "invalid content-type in data uri:" ct)])]
[else (error "invalid data uri:" uri)]))
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