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(define-module (calp webdav util)
:use-module (srfi srfi-1)
:use-module (ice-9 regex)
:use-module (web uri)
:export (parse-dav-line
validate-dav-line
write-dav-line)
)
;;; Parse a DAV HTTP header's content as specified in RFC 4918 §10.1
;;; For example:
;;; DAV: 1, 2, access-control, calendar-access
(define (parse-dav-line str)
(map (lambda (item)
(cond ((string-match "^[0-9]+$" item)
=> (lambda (m) (string->number (match:substring m))))
((string-match "^<(.*)>$" item)
=> (lambda (m) (string->uri (match:substring m 1))))
(else (string->symbol item))))
(map string-trim-both (string-split str #\,))))
(define (validate-dav-line lst)
(every (lambda (item)
(or (and (number? item) (<= 1 item 3))
(uri? item)
;; Possibly check against list of valid tokens
(symbol? item)))
lst))
(define (write-dav-line lst port)
(display
(string-join (map (lambda (item)
(cond ((number? item) (number->string item))
((uri? item) (string-append "<" (uri->string item) ">"))
(else (symbol->string item))))
lst)
", " 'infix)
port))
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