Need to pseudo code to help me understand oauth -

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can please me understand how use oauth authentication allow users access secure sections of website?

i looking psudo code.

for example, when gets authenticated using facebook id,

do need store fact have been authenticated, use session id created facebook in future , compare session id's stored in database?

if yes, happens if facebook user removes application facebook account, latest decide use same id again login website again? session id still match 1 stored in database?

if no, not store in database?

when interaction between user , facebook finished, you'll given token should associate user , persist in database. you'll able use time (configured facebook) , should expect http unauthorized response. in case have present facebook page user can put username password again.


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