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http://flask.pocoo.org/docs/1.0/patterns/viewdecorators/
https://medium.com/%40nguyenkims/python-decorator-and-flask-3954dd186cda
https://stackoverflow.com/questions/19797709/what-is-a-self-written-decorator-like-login-required-actually-doing
https://stackoverflow.com/questions/25288773/login-required-decorator-doesnt-work-flask-login-permits-anonymous-users/25307434
http://exploreflask.com/en/latest/views.html
http://flask-user.readthedocs.io/en/latest/authorization.html
https://pythonprogramming.net/decorator-wrappers-flask-tutorial-login-required/
https://www.programcreek.com/python/example/107384/flask_login.login_required
https://realpython.com/primer-on-python-decorators/
https://www.youtube.com/watch%3Fv%3DCD5lFKyH9Ls
https://timber.io/blog/decorators-in-python/
http://book.pythontips.com/en/latest/decorators.html
https://www.codementor.io/sheena/advanced-use-python-decorators-class-function-du107nxsv