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Mastering OAuth 2.0

You're reading from   Mastering OAuth 2.0 Create powerful applications to interact with popular service providers such as Facebook, Google, Twitter, and more by leveraging the OAuth 2.0 Authorization Framework

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Product type Paperback
Published in Dec 2015
Publisher Packt
ISBN-13 9781784395407
Length 238 pages
Edition 1st Edition
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Table of Contents (17) Chapters Close

Preface 1. Why Should I Care About OAuth 2.0? FREE CHAPTER 2. A Bird's Eye View of OAuth 2.0 3. Four Easy Steps 4. Register Your Application 5. Get an Access Token with the Client-Side Flow 6. Get an Access Token with the Server-Side Flow 7. Use Your Access Token 8. Refresh Your Access Token 9. Security Considerations 10. What About Mobile? 11. Tooling and Troubleshooting 12. Extensions to OAuth 2.0 A. Resource Owner Password Credentials Grant B. Client Credentials Grant C. Reference Specifications Index

What if I have no refresh token? Or my refresh token has expired?


As we mentioned earlier, some service providers simply don't support the refresh token flow. Additionally, even if they do, refresh tokens also expire. Their lifetime is usually much longer, on the order of days or weeks—compared to minutes or hours with access tokens—but, nonetheless, they will expire eventually. So we must be prepared to handle the case where we want to get a new access token, but lack a valid refresh token to use to do so.

Our only alternative, in this case, would be to start the auth process again. To do this, we will essentially log the user back in as if we have never seen them before, starting the entire authorization request process, with whatever flow you like (implicit or authorization code grant) all over again.

For some service providers, this will force them to re-login, and possibly re-authorize your application. But, for many other service providers, they will resume the user's session and issue...

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