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Zad 1 - zaimplementowano testy dla klasy customer (model.py)
Zad 2.
Działający token, którym można złamać system: { "jwt_token":"eyJhbGciOiJub25lIn0.IHsKICAgICAgICAgICAgImFjY291bnQiOiAiQWRtaW5pc3RyYXRvciIsCiAgICAgICAgICAgICJyb2xlIjogIlVzZXIiLAogICAgICAgICAgICAiaWF0IjogMTcwMTcyMjg1NiwKICAgICAgICAgICAgImF1ZCI6ICJodHRwczovLzEyNy4wLjAuMS9qd3Qvbm9uZSIKICAgICAgICB9."
}
Zad 3.

Aby naprawić ten bląd, wystarczy nie przyjmować tokenów, które nie posiadają algorytmu szyfrującego, czyli właśnie te, które mają "None".
Wtedy taki token nie będzie mógł złamać systemu.