Hi Dan,
I'm using a separate validator for filesize:
public void validate(IFormComponent field, ValidationMessages messages,
Object object) throws ValidatorException
{
IUploadFile file = (IUploadFile)object;
if (file.getSize() > maxSize)
{
throw new ValidatorException("File size exceeds
limit.");
}
}
If the MultipartDecoderImpl maxSize gets hit, I think the exception gets
thrown directly from the servlet container or something (based on the
way the error looks.. I could be wrong.) So I think its more a matter of
validating below that limit, whatever it is.
Ben
-----Original Message-----
From: Daniel M Garland [mailto:[EMAIL PROTECTED]
Sent: Thursday, December 15, 2005 11:18 AM
To: Tapestry users
Subject: Re: Client-side validated uploads
Hi Ben,
Where do you catch the exception that is thrown when you exceed the
limit?
Thanks
Dan
Ben Dotte wrote:
> Actually I believe file uploads have a hard-coded limit of 10mb right
> now so I doubt that would be a problem (I've seen this limit hit, you
> get a big ugly error message). See
> http://issues.apache.org/jira/browse/TAPESTRY-764
>
> To get rid of the nasty error message when this limit is hit, I
believe
> its not hard to validate the filesize to be below the 10mb limit..
can't
> remember the details off the top of my head. You can also override
> MultipartDecoderImpl and make a public setter on maxSize if 10mb is
too
> small.
>
> Ben
>
> -----Original Message-----
> From: Daniel M Garland [mailto:[EMAIL PROTECTED]
> Sent: Tuesday, December 13, 2005 11:07 AM
> To: Tapestry users
> Subject: Re: Client-side validated uploads
>
> Hi Ben, all
>
> This is also close to what I had come up with. Actually, I had to
avoid
> the use of ImageIO because we're deploying on Mac OSX and their
ImageIO
> is buggy im sure...
>
> Anyway, this server-side solution has the following problems:
> 1) If you try to upload a 1GB file, you arn't stopping anybody
> 2) You're reading all that data into memory, again if you upload the
> huge file then you're going to lead to issues
>
> In my case, we're hoping that some non-I.T. people will be using the
app
>
> and I can garantee they'll try to upload a billboard-sized TIFF. Hence
> the need to validate client-side.
>
> It would be nice if I could set the value field on a file type (which
is
>
> what is allowed in the 4.01 spec) but it is not supported in most
> browsers.
>
> Do I have to actually implement my own uploading code? Ouch :(
>
> Ben Dotte wrote:
>
>>I wrote a validator for this but I'm not totally sure this doesn't end
>>up uploading the whole file anyway.. doesn't seem like it though.
>>
>>public void validate(IFormComponent field, ValidationMessages
>
> messages,
>
>>Object object) throws ValidatorException
>>{
>> IUploadFile imageFile = (IUploadFile)object;
>> InputStream fis = imageFile.getStream();
>> ImageInputStream iis = null;
>>
>> try
>> {
>> iis = ImageIO.createImageInputStream(fis);
>> Iterator imageReaders = ImageIO.getImageReaders(iis);
>> if (!imageReaders.hasNext())
>> {
>> // There are no image readers for this file
>> fis.close();
>> throw new ValidatorException("Invalid image
>>file.");
>> }
>> ImageReader firstReader =
>>(ImageReader)imageReaders.next();
>> String imageFormat =
>>firstReader.getFormatName().toLowerCase();
>> if (!imageFormat.equals("jpeg") &&
>>!imageFormat.equals("jpg") &&
>> !imageFormat.equals("gif") &&
>>!imageFormat.equals("png"))
>> {
>> // This is a valid image but we only accept
>>jpeg, jpg, gif, or png
>> fis.close();
>> throw new ValidatorException("The image format
>>must be JPG, GIF, or PNG.");
>> }
>> BufferedImage image = ImageIO.read(iis);
>> if (image.getWidth() > maxWidth || image.getHeight() >
>>maxHeight)
>> {
>> // This image is too big
>> fis.close();
>> throw new ValidatorException("The image exceeds
>>the maximum width/height.");
>> }
>> fis.close();
>> }
>> catch (IOException ioe)
>> {
>> // There was some other problem uploading the image
>> throw new ValidatorException("Invalid image file.");
>> }
>> finally
>> {
>> if (iis != null) {
>> try { iis.close(); } catch (IOException ioe) {}
>> }
>> if (fis != null) {
>> try { fis.close(); } catch (IOException ioe) {}
>> }
>> }
>>}
>>
>>HTH
>>
>>Ben
>>
>>-----Original Message-----
>>From: Daniel M Garland [mailto:[EMAIL PROTECTED]
>>Sent: Tuesday, December 13, 2005 10:01 AM
>>To: [email protected]
>>Subject: Client-side validated uploads
>>
>>Hi all,
>>
>>I'm trying to figure out how to get around a brick wall:
>>
>>I want to validate an image file based upon its dimensions and
>
> filesize
>
>>before allowing the file to be written up to the server. I thought
>
> about
>
>>achieving this using a signed applet to read the file, and then pass
>
> an
>
>>acceptable filename to an Upload component. However, the value field
>>will not be supported in most browsers, so is there any other way I
>
> can
>
>>use the Uploading features of Tapestry by somehow extending Upload?
>>
>>If not, where is the code that does this? I hear something about the
>>commons project at apache but currently jakarta.apache.org/commons/
>>appears to be down.
>>
>>Thanks for your help in advance.
>
>
--
Dan Garland
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