[auth] Add OAuth2 state param for csrf protection #18
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As you all know, in the Authorization Request of OAuth 2.0, it is recommended to use the state parameter as CSRF countermeasure.
https://developers.google.com/identity/protocols/OAuth2WebServer
However, Identity beginners may use your sample code as it is without being conscious of this.
Use the state parameter to avoid including the most major vulnerability in OAuth 2.0.