Re: WOFileUpload
Re: WOFileUpload
- Subject: Re: WOFileUpload
- From: Asa Hardcastle <email@hidden>
- Date: Fri, 18 Apr 2008 23:01:43 -0400
Hi Sirius,
This approach does not solve reading _any_ data from the wire, but it
will cut the user short if a limit is exceeded; use
WOMultipartIterator instead of a WOFileUpload.
(In takeValuesFromRequest or inside of a direct action, )
first check the header and dump out if it is too big (although it does
not give much insight if you have multiple files):
request.headerForKey("content-length")
... and if the header is lying!!!!! That dirty rascal!!
grab the multipart iterator
WOMultipartIterator multipartIterator = request.multipartIterator();
Loop through the formdata calling multipartIterator.nextFormData()
WOMultipartIterator.WOFormData formData =
multipartIterator.nextFormData();
Test for a file input:
formData.isFileUpload()
If it is a file upload, grab the name and the stream
formData.name()
InputStream in = formData.formDataInputStream()
Now write the stream to disk manually, reading into a buffer and
writing to an output stream, keeping track of how many bytes you have
written and dumping out if you exceed the limit.
Something like this should work:
byte[] buff = new byte[25600];
int b_total = 0, b_read = in.read(buff);
OutputStream out = new FileOutputStream("/tmp/maybearealybigfile");
while(-1 != b_read)
{
b_total += b_read;
if(b_total > MY_MAX_BYTES)
{
... close output stream and delete the partial file from disk ...
break;
}
out.write(buff, 0, b_read);
b_read = in.read(buff);
}
... close your streams if they are open ...
http://developer.apple.com/documentation/DeveloperTools/Reference/WO541Reference/com/webobjects/appserver/WOMultipartIterator.html
hope this helps,
:)
asa
On Apr 18, 2008, at 8:10 PM, sirius black wrote:
I'm trying to verify the size of a file upload and limit its upload
before actually sending any data across the wire. I know I can
check the content-length header early on in the game in
dispatchRequest, but even if I just throw a RuntimeException at that
point, I can't stop WebObjects from reading in the data anyways,
before sending back a response. I'm using WOFileUpload with
streamToFilePath.
Fwiw, I've looked into javascript validation to try and check the
content-length client side first, but haven't had success with that.
Thoughts?
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| References: | |
| | >WOFileUpload (From: "sirius black" <email@hidden>) |