The information on the file posted by xmlrpc cannot be changed by wp_handle_upload.

[jyoshida]

1. The part corrected by #3395 is overwritten.

The wp_handle_uplaod filter cannot access the uploaded file.

2. apply_filters() is called after wp_insert_attachment().

Even if wp_handle_upload rewrites an information, it is recorded on the database for the information before a modification.

The patch to xmlrpc

I'm not sure I follow, isn't the current XML-RPC behavior the same as uploading a file via wp-admin? See wp_handle_upload( ) in wp-admin/includes/file.php.

Hmmm, I'm tempted to say that we should be using wp_handle_upload( ) in XML-RPC.

Replying to josephscott:

I'm not sure I follow, isn't the current XML-RPC behavior the same as uploading a file via wp-admin? See wp_handle_upload( ) in wp-admin/includes/file.php.

No, it is different.
For example, in wp-admin/include/media.php media_handle_upload(), wp_handle_upload() is called before wp_insert_attachment().
I think that meida_handle_upload() is used from a dashboard when an image file is uploaded. The wp_handle_uplaod filter can access the uploaded file and can also perform the updation of file information.

Hmmm, I'm tempted to say that we should be using wp_handle_upload( ) in XML-RPC.

I think that a good idea replaces apply_filters() by wp_handle_uplaod().

In general I think it is best to push filters/hooks/etc. down further into WordPress than to have them higher up in the XML-RPC code. This tends to reduce unnecessary code duplication.

Can you put together a patch that makes use of the wp_handle_upload( ) function instead?

It was tried. But it failed. wp_handle_upload() was made so that a file might be received by $_FILES. It seems that the file made from wp_upload_bit() cannot be handled.

Closed as duplicate in favor of #21292