Many web sites offer users the option to use a streamlined single-click registration and login built on third party authentication services, typically run by the big social networks. In this article I want to give you an introduction to the OAuth protocol, which is one of the most used third-party authentication mechanism. I will also show you a complete Flask application that implements "Sign In with Facebook" and "Sign In with Twitter" functionality. With these two implementations as a guide you should find it easy to add any other OAuth providers you may need.
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