Import automatization script

Hello,

I’m migrating a relatively small custom portal (roughly 10k posts) to wordpress. Problem is that I want to migrate the pictures aswell. I want to insert every picture from source to the post’s gallery.

I have managed to do that with wp_insert_attachment. Basically I have moved everything by now, but the images I’m uploading have silly names (md5 hashes). Also I’m resizing the images to thumbnail (150×150), medium (300×300) etc sizes with manually created and serialized meta data (so that when I pop up my gallery within a post I can see also the smaller sizes).

Question: is there some wp-native way to do this process? like wp_insert_image_attachment($postid, $imageurl) – which would take the image from one directory, process it for all sizes possible, create metadata and put it to the proper place?