On Tue, Jan 29, 2019 at 4:17 AM Christopher Lemmer Webber <
cweb...@dustycloud.org> wrote:
>
> Any thoughts on how I should move forward?
I think that using a `data-procedure/c` of a particular sort should allow
you to implement this without needing access to the struct internals or
needing to read everything into memory at once.
(Though, it would be a bit nicer if the write proc allowed you to specify
an offset and length into the string/byte string.)
Something like:
===
#lang racket/base
(require net/http-client
file/sha1
racket/random)
(define (http-conn-send/multipart! hc uri multipart-body
#:version [version #"1.1"]
#:method [method #"POST"]
#:close? [close? #f]
#:headers [headers '()]
#:content-decode [decodes '(gzip)]
#:boundary [boundary (random-boundary)])
(define content-type-header
(string-append
"Content-Type: multipart/form-data; boundary="
boundary))
(http-conn-send! hc uri
#:version version
#:method method
#:close? close?
#:headers (cons content-type-header headers)
#:content-decode decodes
#:data (multipart-body->data-proc boundary
multipart-body)))
(define (mime-escape s)
(regexp-replace* #rx"[\"\\]" s "\\\\\\0"))
(define (make-string-part field-name field-value)
(λ (write-chunk boundary)
(write-chunk
(format
(string-append "--~a\r\n"
"Content-Disposition: form-data; name=\"~a\"\r\n"
"Content-Type: text/plain; charset=utf-8\r\n"
"\r\n"
"~a\r\n")
boundary
(mime-escape field-name)
field-value))))
(define (make-file-part field-name file-name content-type in)
(λ (write-chunk boundary)
(write-chunk
(format
(string-append "--~a\r\n"
"Content-Disposition: form-data; name=\"~a\";
filename=\"~a\"\r\n"
"Content-Type: ~a\r\n"
"\r\n")
boundary
(mime-escape field-name)
(mime-escape file-name)
content-type))
(define buffer (make-bytes 4096))
(let loop ([n (read-bytes-avail! buffer in)])
(cond
[(eof-object? n)
n]
[else
(write-chunk (subbytes buffer 0 n))
(loop (read-bytes-avail! buffer in))]))
(write-chunk "\r\n")))
(define (multipart-body->data-proc boundary parts)
(λ (write-chunk)
(for ([part parts])
(part write-chunk boundary))
(write-chunk (format "--~a--\r\n" boundary))))
(define (random-boundary)
(string-append
"--------------------------"
(bytes->hex-string
(crypto-random-bytes 8))))
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