[plt-scheme] CGI file upload

Here's what you'd do:

* Create a connection with
http://svn.plt-scheme.org/plt/trunk/collects/web-server/private/connection-manager.ss
where the i-port is (current-input-port)
* Call read-request from
http://svn.plt-scheme.org/plt/trunk/collects/web-server/http/request.ss
with the connection
* Now you have a web-server style http request.

Jay

On Thu, Aug 6, 2009 at 10:55 AM,
emmanuel.delaborde<emmanuel.delaborde at cimex.com> wrote:
> Hi Jay
> I thought it would be fairly straightforward, and that maybe I was missing
> something or else the CGI PLT docs had omitted this use case...
> Still, I'd like to make some progress, can you advise or give me some
> pointers on 1) how to read from stdin from my CGI script
> and 2) using the web-server http request parser ?
> Thanks in advance
> E.D
>
> On 6 Aug 2009, at 17:43, Jay McCarthy wrote:
>
> On Wed, Aug 5, 2009 at 6:09 PM, Emmanuel
> Delaborde<emmanuel.delaborde at cimex.com> wrote:
>
> Hello
>
> I am turning a small web application using web/server into a cgi script
>
> so far so good, but I got stuck when I tried rewriting my file upload
>
>  function
>
> the form to upload an image was:
>
> (form ((action ,(make-url add-image))
>
>                            (method "post")
>
>                            (enctype "multipart/form-data"))
>
>                           (input ((type "file")(name "image")))
>
>                           (input ((type "submit"))))
>
> and the form handler was:
>
> (define (add-image request)
>
>             (match
>
>                 (bindings-assq #"image" (request-bindings/raw request))
>
>               [(? binding:file? b)
>
>                (let ([filename (bytes->string/utf-8 (binding:file-filename
>
> b))])
>
>                  (save-image! (binding:file-content b) filename images-path)
>
>                  (portfolio-insert-image! a-portfolio filename))
>
>                ])
>
>             (admin (redirect/get)))
>
> this worked fine.
>
> I got the filename with: (binding:file-filename b)
>
> and the file content with: (binding:file-content b)
>
> Now I am trying to write the same function using what is provided by
>
> net/cgi, namely :
>
> (get-bindings)
>
> (extract-bindings key? bindings)
>
> (extract-binding/single key? bindings)
>
> It seems pretty straightforward when it comes to simple form values, but not
>
> so with a file upload...
>
> Can I get both the file name and the file content through the bindings
>
> functions ?
>
> Has anybody a simple cgi script dealing with file upload, laying around ?
>
> Thanks
>
> E.
>
> You have discovered the reason to get rid of the extract-bindings API.
>
> I don't know of any work around for CGI scripts. Perhaps the file
> content is just on stdin after get-bindings... but I really don't
> know.
>
> You could try piping stdin to the web-server http request parser and
> use it's http structs, but from a cgi script, but I haven't tried it
> before.
>
> Jay
>
> --
> Jay McCarthy <jay at cs.byu.edu>
> Assistant Professor / Brigham Young University
> http://teammccarthy.org/jay
>
> "The glory of God is Intelligence" - D&C 93
>
> --
> Emmanuel Delaborde
> Web Technologist
> Cimex
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-- 
Jay McCarthy <jay at cs.byu.edu>
Assistant Professor / Brigham Young University
http://teammccarthy.org/jay

"The glory of God is Intelligence" - D&C 93