[racket-users] handin server error

[Cameron Swords]

Hi,

I'm trying to set up a handin server for a class this semester, and I'm getting 
the weirdest error message from the client side. Here it is:

submit error: Error in your code --
file-exists?: `exists' access denied for libobj.so

This seems tied to the fact that the submission file requires another file 
(precisely, it requires 2htdp/image as `(require 2htdp/image)`), and when I 
remove that it works fine (though obviously inhibits the assignment).

Attached are the checker and configuration.

Any help would mean a lot!

Thanks,
Cameron Swords

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checker.rkt
Description: Binary data


config.rktd
Description: Binary data

[racket-users] Re: Sending a file via HTML request.

[Jack Firth]

You could base64 encode the file bytes and stick that into a field in the JSON 
you send. Why not just send the file directly though? For instance, instead of 
sending this:

POST /somewhere
Content-Type: application/json
{
  filename: "foo"
  content: "Zm9vLGJhcixiYXoNCjEsMSwxDQoyLDIsMg0KMywzLDM="
}

Send this:

POST /somewhere
Content-Type: text/csv
foo,bar,baz
1,1,1
2,2,2
3,3,3

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[racket-users] RE: linespacing in scribble with superscripts

[Jos Koot]

Thanks very much.
Very clear answer.
I am talking about HTML, indeed.
I certainly will try your code.
Thanks again, Jos 

-Original Message-
From: Dupéron Georges [mailto:jahvascriptman...@gmail.com] 
Sent: martes, 23 de agosto de 2016 12:56
To: Racket Users
Cc: jos.k...@gmail.com
Subject: Re: linespacing in scribble with superscripts

Le jeudi 18 août 2016 22:21:37 UTC+2, jos.koot a écrit :
> #lang scribble/manual
> bla blah blah@(linebreak)
> blah blah bla @superscript{blah blah bah}@(linebreak)
> bla blah blah
> 
> the linespacing between the first 2 lines is larger
> than between the last 2 lines.

I suppose you are talking about the HTML output, as LaTeX (used for the PDF 
output) handles this correctly, unless you start
stacking many superscripts, as you noted.

I used a quick hack to collapse the element's vertical height in HTML, with 
`margin-top` and `margin-bottom` set to an arbitrary,
large, negative value, and `display: inline-block;` so that the margin is taken 
into account.

Unfortunately, scribble doesn't apply a CSS class to superscript elements, and 
instead it uses some hard-coded `style="…"` attribute
on the element. I therefore suggest overriding the `superscript` function with 
your own definition. The code below renders as the
attached screenshot, and allows you to use the `@original-superscript{…}` if 
you need.

#lang scribble/manual

@(require scribble/core
  scribble/html-properties
  scribble/latex-properties
  (only-in scribble/manual
   [superscript original-superscript]))
@(define thin-superscript-css
   (string->bytes/utf-8 #

Re: [racket-users] Sending a file via HTML request.

[spdegabrielle]

Hi, 

JSON (require json-parsing) see 
https://docs.racket-lang.org/json-parsing/index.html 

I've cribbed the HTML below from 
http://www.w3schools.com/tags/att_input_accept.asp 


On the web server side this SO response seems to answer, 

http://stackoverflow.com/questions/20588641/in-racket-how-do-you-allow-file-upload-to-the-web-server

#lang web-server/insta
(require web-server/formlets)

 ; start: request -> doesn't return
(define (start request)
  (show-page request))

; show-page: request -> doesn't return
(define (show-page request)
  ; Response generator
  (define (response-generator embed/url)
(response/xexpr
 `(html 
   (head (title "File upload example"))
   (body (h1 "File upload example"))
   (form 
([action ,(embed/url upload-handler)]
 [method "POST"]
 [enctype "multipart/form-data"])
,@(formlet-display file-upload-formlet)
(input ([type "submit"] [value "Upload"]))

  (define (upload-handler request)
(define-values (fname fcontents)
  (formlet-process file-upload-formlet request))
(define save-name (string-append "!uploaded-" fname))
(current-directory WORKINGDIR)
(display-to-file fcontents save-name #:exists 'replace)
(response/xexpr
 `(html
   (head (title "File Uploaded"))
   (body (h2 "File uploaded")
 (p ,fname)
 (h2 "File size (bytes)")
 (p ,(number->string (file-size save-name)))

  (send/suspend/dispatch response-generator))


; file-upload-formlet: formlet (binding?)
(define file-upload-formlet
  (formlet
   (div ,{(file-upload) . => . binds})
   ; (formlet-process file-upload-formlet request)
   ; returns the file name and contents:
   (let
   ([fname (bytes->string/utf-8 (binding:file-filename binds))]
[fcontents (binding:file-content binds)])
 (values fname fcontents


(I've not tried this - I'm not sure it is correct)








  
  


Note: The accept attribute of the input tag is not 
supported in Internet Explorer 9 (and earlier versions), and Safari 5 (and 
earlier).
Note: Because of security issues, this example will not 
allow you to upload files.





HTH Stephen


On Tuesday, August 23, 2016 at 3:47:05 PM UTC+1, Normal Loone wrote:
> No, I don't have it in JSON yet. How do I load a file into JSON in racket?
> 
> It's only a text file, although I like to get it zipped first.

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Re: [racket-users] Sending a file via HTML request.

[Normal Loone]

No, I don't have it in JSON yet. How do I load a file into JSON in racket?

It's only a text file, although I like to get it zipped first.

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Re: [racket-users] Sending a file via HTML request.

[Matthias Felleisen]

If the file is in JSON, just read-json and then write-json to the port. 


> On Aug 23, 2016, at 5:09 AM, Normal Loone  wrote:
> 
> Yeah, my main problem is how do I pack the file into a JSON Object and then 
> send it?
> 
> With (require net/http-client) I could already establish a connection with 
> (http-conn-sendrecv! hc uri), but All I can send is the empty header of the 
> http request. 
> 
> How do I add the HTML code or the file in the json object within it?
> 
> -- 
> You received this message because you are subscribed to the Google Groups 
> "Racket Users" group.
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[racket-users] Re: linespacing in scribble with superscripts

[Dupéron Georges]

Le jeudi 18 août 2016 22:21:37 UTC+2, jos.koot a écrit :
> #lang scribble/manual
> bla blah blah@(linebreak)
> blah blah bla @superscript{blah blah bah}@(linebreak)
> bla blah blah
> 
> the linespacing between the first 2 lines is larger
> than between the last 2 lines.

I suppose you are talking about the HTML output, as LaTeX (used for the PDF 
output) handles this correctly, unless you start stacking many superscripts, as 
you noted.

I used a quick hack to collapse the element's vertical height in HTML, with 
`margin-top` and `margin-bottom` set to an arbitrary, large, negative value, 
and `display: inline-block;` so that the margin is taken into account.

Unfortunately, scribble doesn't apply a CSS class to superscript elements, and 
instead it uses some hard-coded `style="…"` attribute on the element. I 
therefore suggest overriding the `superscript` function with your own 
definition. The code below renders as the attached screenshot, and allows you 
to use the `@original-superscript{…}` if you need.

#lang scribble/manual

@(require scribble/core
  scribble/html-properties
  scribble/latex-properties
  (only-in scribble/manual
   [superscript original-superscript]))
@(define thin-superscript-css
   (string->bytes/utf-8 #

Re: [racket-users] Sending a file via HTML request.

[Normal Loone]

Yeah, my main problem is how do I pack the file into a JSON Object and then 
send it?

With (require net/http-client) I could already establish a connection with 
(http-conn-sendrecv! hc uri), but All I can send is the empty header of the 
http request. 

How do I add the HTML code or the file in the json object within it?

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Re: [racket-users] Racket Shell

[Andrew Gwozdziewycz]

> On Aug 22, 2016, at 13:18, Vincent St-Amour  
> wrote:
> 
> On Mon, 22 Aug 2016 11:38:37 -0500,
> Andrew Gwozdziewycz wrote:
>> 
>> This discussion has reminded of SHILL
>> (https://www.usenix.org/system/files/conference/osdi14/osdi14-paper-moore.pdf)
>> which is less user focused, and more security / capabilities focused,
>> but the prototype (in Racket) utilizes contracts to enforce
>> capabilities checks.
> 
> Yes, that's really cool work!
> 
> For those interested, Scott will be speaking about Shill at RacketCon[1]
> next month.

Oh, rad! I will watch out for the video. Sadly, I won't be attending.

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