Developing a worker script for passthrough

Hello , I am new to CloudFlare and Worker Scripts , I wanted to create a worker which passthrough the request if it authenticated with Okta else I need to return login screen ,
How can I start with it , what are the prerequisite for this ? , Is there any sample available for this task .

I don’t know of a pure Workers oauth setup that would work with Okta (there might be one), but CF Access supports Okta auth and CF workers can be protected via Access:

You would then protect your worker by setting up Access rules for the same path that your Worker runs on.