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;;;; xml-rpc-lolevel.scm
;
;; An implementation of the XML-RPC protocol
;;
;; This file contains the plumbing for XML RPC value marshaling/unmarshaling.
;
; Copyright (c) 2009-2012, 2016, Peter Bex
; Parts Copyright (c) Felix Winkelmann
; All rights reserved.
;
; 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 author 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 HOLDERS 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.
;
; Please report bugs, suggestions and ideas to the Chicken Trac
; ticket tracking system (assign tickets to user 'sjamaan'):
; http://trac.callcc.org
(module xml-rpc-lolevel
(signal-xml-rpc-error
xml-rpc-unparsers value->xml-rpc-fragment
list->xml-rpc-array vector->xml-rpc-array
number->xml-rpc-int number->xml-rpc-double
boolean->xml-rpc-boolean ->xml-rpc-string
u8vector->xml-rpc-base64 blob->xml-rpc-base64
alist->xml-rpc-struct hash-table->xml-rpc-struct
vector->xml-rpc-iso8601
nonempty-symbol-keyed-alist?
xml-rpc-parsers xml-rpc-fragment->value
xml-rpc-int->number xml-rpc-double->number
xml-rpc-boolean->number xml-rpc-string->string
xml-rpc-array->vector xml-rpc-array->list
xml-rpc-struct->alist xml-rpc-struct->hash-table
xml-rpc-base64->string xml-rpc-base64->u8vector xml-rpc-base64->blob
xml-rpc-datetime->vector)
(import (chicken base) scheme srfi-1 srfi-4 srfi-69 base64 sxpath-lolevel (chicken time posix) (chicken condition) (chicken string) (chicken blob))
(define (signal-xml-rpc-error code msg . args)
(signal
(make-composite-condition
(make-property-condition 'exn 'message msg 'arguments args)
(make-property-condition 'xml-rpc 'code code))))
(define (list->xml-rpc-array v)
`(array (data ,@(map (lambda (el)
`(value ,(value->xml-rpc-fragment el)))
v))))
(define (vector->xml-rpc-array v)
(list->xml-rpc-array (vector->list v)))
(define (number->xml-rpc-int v)
`(i4 ,(number->string (inexact->exact (round v)))))
(define (number->xml-rpc-double v)
`(double ,(number->string (exact->inexact v))))
(define (boolean->xml-rpc-boolean v)
`(boolean ,(if v "1" "0")))
(define (->xml-rpc-string v)
`(string ,(->string v)))
(define (u8vector->xml-rpc-base64 v)
(blob->xml-rpc-base64 (u8vector->blob/shared v)))
(define (blob->xml-rpc-base64 v)
`(base64 ,(base64-encode (blob->string v))))
(define (alist->xml-rpc-struct v)
`(struct ,@(map (lambda (p)
`(member
(name ,(->string (car p)))
(value ,(value->xml-rpc-fragment (cdr p)))))
v)))
(define (hash-table->xml-rpc-struct v)
(alist->xml-rpc-struct (hash-table->alist v)))
(define (vector->xml-rpc-iso8601 v)
`(dateTime.iso8601 ,(time->string v "%Y%m%dT%H:%M:%S")))
(define (nonempty-symbol-keyed-alist? v)
(and (not (null? v))
(list? v)
(every (lambda (p)
(and (pair? p) (symbol? (car p))))
v)))
(define xml-rpc-unparsers
(make-parameter `((,vector? . ,vector->xml-rpc-array)
(,(disjoin flonum? ratnum?) . ,number->xml-rpc-double)
(,integer? . ,number->xml-rpc-int)
(,boolean? . ,boolean->xml-rpc-boolean)
(,string? . ,->xml-rpc-string)
(,symbol? . ,->xml-rpc-string)
(,u8vector? . ,u8vector->xml-rpc-base64)
(,blob? . ,blob->xml-rpc-base64)
(,hash-table? . ,hash-table->xml-rpc-struct)
(,nonempty-symbol-keyed-alist? . ,alist->xml-rpc-struct)
(,list? . ,list->xml-rpc-array))))
(define (value->xml-rpc-fragment value)
(let ((pred&unparser (find (lambda (p&u) ((car p&u) value))
(xml-rpc-unparsers))))
(if pred&unparser
((cdr pred&unparser) value)
(error "No parser for value " value))))
(define (xml-rpc-int->number fragment)
(string->number (sxml:text fragment)))
(define (xml-rpc-double->number fragment)
(string->number (sxml:text fragment)))
(define (xml-rpc-boolean->number fragment)
(not (= (string->number (sxml:text fragment)) 0)))
(define xml-rpc-string->string sxml:text)
(define (xml-rpc-base64->string fragment)
(base64-decode (sxml:text fragment)))
(define (xml-rpc-base64->u8vector fragment)
(blob->u8vector/shared (string->blob (base64-decode (sxml:text fragment)))))
(define (xml-rpc-array->vector fragment)
(list->vector (xml-rpc-array->list fragment)))
(define (xml-rpc-array->list fragment)
(map (lambda (v)
(xml-rpc-fragment->value v))
((node-join (select-first-kid (ntype?? 'data))
(select-kids (ntype?? 'value))
sxml:content)
fragment)))
(define (xml-rpc-struct->alist fragment)
(map (lambda (v)
(cons (string->symbol
(sxml:text ((select-first-kid (ntype?? 'name)) v)))
(xml-rpc-fragment->value
(car (sxml:content ((select-first-kid (ntype?? 'value)) v))))))
(sxml:content fragment)))
(define (xml-rpc-struct->hash-table fragment)
(alist->hash-table (xml-rpc-struct->alist fragment)))
(define (xml-rpc-base64->blob fragment)
(u8vector->blob/shared (base64-decode (cadr fragment))))
(define (xml-rpc-datetime->vector fragment)
(string->time (cadr fragment) "%Y%m%dT%H:%M:%S"))
(define xml-rpc-parsers
(make-parameter `((i4 . ,xml-rpc-int->number)
(int . ,xml-rpc-int->number)
(double . ,xml-rpc-double->number)
(boolean . ,xml-rpc-boolean->number)
(string . ,xml-rpc-string->string)
(base64 . ,xml-rpc-base64->u8vector)
(dateTime.iso8601 . ,xml-rpc-datetime->vector)
(array . ,xml-rpc-array->vector)
(struct . ,xml-rpc-struct->hash-table))))
(define (xml-rpc-fragment->value fragment)
((alist-ref (sxml:element-name fragment) (xml-rpc-parsers) eq?
(lambda _ (error "No unparser for tag " (car fragment))))
fragment))
)
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