Re: Query regarding temporarily-uploaded files

On 7/10/2013 1:21 PM, Ajay Garg wrote:
> Hi all.
>
> I have a requirement, wherein I need to allow vanilla uploads of files
> to a HTTPD server.
>
> Any client can upload any number of files (one at a time).
> Also, there is just one directory, where the files get stored
> "finally" (that is, after being copied from the temporary location,
> via "move_uploaded_file")
>
> Also, I have been able to get the simple file uploading running via
> PHP, by picking up one of the numerous "Hello World" examples
> available :)
>
>
>
> Now, I am facing the following use-case ::
>
> 1)
> User 1 starts uploading a large file, say "big_file.avi".
>
> 2)
> Meanwhile, user 2 also starts uploading a (different) file, but with
> the same name "big_file.avi".
>
>
> In an ideal scenario, user 2 should be prompted with a message, that a
> file of the same name is already being uploaded by someone else
> somewhere.
> Is there a way to do this?
>
> ( Note that, had the user 2 started uploading AFTER user 1 had
> finished with the upload, we could probably modify the PHP-script at
> the sever-side, to let user-2 know that a file of the same name
> already exits. But I am failing to find a solution, when the user 2
> starts the upload WHILE the large file of user 1 is in the process of
> completing uploading).
>
>
> Any way the issue may be solved?
>
> I will be grateful for any pointers :)
>
>
>
> Regards,
> Ajay
>
The problem is not of PHP's making.  It is something that you have to 
program around.  Is the user determining the filename to be used?  If 
so, then you need to check for that name before doing you "move".  If 
it's a duple, then create a temporary name in your final place, hide it 
in the user's page and send it back to him with a message to change his 
name.

If the user is NOT determining the name, then your normal process would 
be to pick an unused name I presume and send That back to the user 
anyway, so problem never happens.