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Implementing API Authentication with Guardian in Phoenix

/phoenix#authentication#api
mhanberg

mhanberg

Expert LSP Core Team

Implementing API Authentication with Guardian in Phoenix

Hi! I recently finished adding authentication to my Phoenix API, so I wanted to share what I learned.

I haven’t created authentication for an API only application before, so not using sessions/cookies was a little confusing at first. I hope this post can help others who haven’t writter an API before!

Thanks!

9 comments
/phoenix#authentication#api
4806 9

First Post! Switch mode

acrolink

acrolink

@mhanberg, thank you very much. I want to ask, for how long is the token valid? How to configure that setting and does the token refresh / extends its validity the user actively is using it (i.e. does it expire only if it had been idle for some time)

1
Post #1

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mhanberg

mhanberg

Expert LSP Core Team

The documentation for the configuration you’re looking for is here GitHub - ueberauth/guardian: Elixir Authentication · GitHub. These options go in the configuration in config.ex

The default TTL (time to live) for the JWT is 4 weeks and I believe you need to manually refresh the token. My post doesn’t detail that aspect :sweat_smile:

2
Post #2
mhanberg

mhanberg

Expert LSP Core Team

I’m on a business trip right now, I’ll reply to this when I get some free
time. But in the meantime, look into the Phoenix Fallback Controller
functionality.

Relevant blog →

https://swanros.com/2017/03/04/action-fallback-contexts-phoenix1-3-tiny-controllers/amp/

2
Post #6

Last Post!

acrolink

acrolink

Thanks @kokolegorille, based on your idea I have found that the code block needed to handle wrong email address (non existent in DB) is:

def call(conn, :nil) do
  conn
  |> put_status(:unauthorized)
  |> json(%{status: "unauthorized"})
end
2
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