Rename files during upload within Wordpress backen

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

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 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

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.

Answer 4

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 5

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 6

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!