Uses the excellent joken hex package to generate and sign Json Web Tokens.

Configuration

There are a few things we need to know in order to generate and sign a JWT:

• signing_algorithm - the crypographic algorithm used to to sign tokens.
• token_lifetime - how long the token is valid for (in hours).
• signing_secret - the secret key used to sign the tokens.

These can be configured in your resource's token DSL:

defmodule MyApp.Accounts.User do
  # ...

  authentication do
    tokens do
      token_lifetime 32
      signing_secret fn _, _ ->
        System.fetch_env("TOKEN_SIGNING_SECRET")
      end
    end
  end

  # ...
end

The signing secret is retrieved using the AshAuthentication.Secret behaviour, which means that it can be retrieved one of three ways:

1. As a string directly in your resource DSL (please don't do this unless you know why this is a bad idea!), or
2. a two-arity anonymous function which returns {:ok, secret}, or
3. the name of a module which implements the AshAuthentication.Secret behaviour.

Available signing algorithms are EdDSA, Ed448ph, Ed448, Ed25519ph, Ed25519, PS512, PS384, PS256, ES512, ES384, ES256, RS512, RS384, RS256, HS512, HS384 or HS256. Defaults to HS256.

We strongly advise against storing the signing secret in your mix config or directly in your resource configuration. We instead suggest you make use of runtime.exs and read it from the system environment or other secret store.

The default token lifetime is 168 and should be specified in integer positive hours.