AOSP(?) Or uncompiled source code for SM-J320P

My roommate is going to begin working on getting this device rooted. He told me to do that he needs the uncompiled kernel and source code (I believe, if that doesn't make sense please correct me). I have rooted my phone before by myself so I have a little experience, and can get temp root so far on the phone. Would anyone know how to acquire what he needs? I have the device in question and I'm not afraid to risk breaking it to get this done.

Also if anyone has any general advice I can pass along to him please let me know. Thank you!

TL;DR

Friend needs source code for Samsung Galaxy J3 to work on custom rom/kernel. Where/how to acquire this?

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