Rename files during upload within Wordpress backend - wordpress

Question

is there a way to rename files during the upload progress within the Wordpress 3.0 backend? I would like to have a consistent naming of files, especially for images.
I think an 12 (+-) digit hash value of the original filename or something similar would be awesome. Any suggestions?
Regards

Answer 1

But it would really be easier to do that before uploading files.
Not quite sure about that - this seems fairly easy;
/**
* #link http://stackoverflow.com/a/3261107/247223
*/
function so_3261107_hash_filename( $filename ) {
$info = pathinfo( $filename );
$ext = empty( $info['extension'] ) ? '' : '.' . $info['extension'];
$name = basename( $filename, $ext );
return md5( $name ) . $ext;
}
add_filter( 'sanitize_file_name', 'so_3261107_hash_filename', 10 );
This filter creates a 32 character hash of the original filename, preserving the file extension. You could chop it down a little using substr() if you wanted to.
This filter runs once the file has been uploaded to a temporary directory on your server, but before it is resized (if applicable) and saved to your uploads folder.
Note that there is no risk of file overwrite - in the event that a newly hashed file is the same as one that already exists, WordPress will try appending an incrementing digit to the filename until there is no longer a collision.
WordPress Plugin
<?php
/**
* Plugin Name: Hash Upload Filename
* Plugin URI: http://stackoverflow.com/questions/3259696
* Description: Rename uploaded files as the hash of their original.
* Version: 0.1
*/
/**
* Filter {#see sanitize_file_name()} and return an MD5 hash.
*
* #param string $filename
* #return string
*/
function so_3261107_hash_filename( $filename ) {
$info = pathinfo( $filename );
$ext = empty( $info['extension'] ) ? '' : '.' . $info['extension'];
$name = basename( $filename, $ext );
return md5( $name ) . $ext;
}
add_filter( 'sanitize_file_name', 'so_3261107_hash_filename', 10 );

Answer 2

http://wpapi.com/change-image-name-to-wordpress-post-slug-during-upload/
BTW:
Add filter to sanitize_file_name is totally wrong, as sanitize_file_name() function is a helper function to format string, it may be used elsewhere like plugins or themes.
function wp_modify_uploaded_file_names($file) {
$info = pathinfo($file['name']);
$ext = empty($info['extension']) ? '' : '.' . $info['extension'];
$name = basename($file['name'], $ext);
$file['name'] = uniqid() . $ext; // uniqid method
// $file['name'] = md5($name) . $ext; // md5 method
// $file['name'] = base64_encode($name) . $ext; // base64 method
return $file;
}
add_filter('wp_handle_upload_prefilter', 'wp_modify_uploaded_file_names', 1, 1);

Answer 3

I've made a plugin for it. I did it because i was having too much trouble with my clients trying to upload images with special characters
http://wordpress.org/plugins/file-renaming-on-upload

Answer 4

I implemented the same thing, I wanted a more random filename, than the original, as the site I am using this for is for pics only and all files are in one directory.
i did the following
return md5($ip . uniqid(mt_rand(), true)) . $ext;

Answer 5

I was really looking for a plugin that could do it properly, and finally I ended up making this one myself. It's available on my blog: http://www.meow.fr/media-file-renamer ! If you use it, please give me a feedback :) I sincerely hope it helps!

Answer 6

You can't autorename file with the media library function. I would recommend to rename files before you upload them. Even after uploading a file you can't rename it throug WordPress but only through FTP.
The only way to do that would be a plugin that hooks itself into the media library upload process. But it would really be easier to do that before uploading files.