There are a few library/binary requirements required in order for the Paseto library to work on any computer:
- Erlang version >= 20.1
- This is required because this was the first Erlang version to introduce crypto:sign/5.
- libsodium >= 1.0.13
- This is required for cryptography used in Paseto.
- This can be found at https://github.com/jedisct1/libsodium
- openssl >= 1.1
- This is needed for XChaCha-Poly1305 used for V2.Local Paseto
NOTE: This was basically 100% plagiarized from the Guardian documentation, so, for further configuration options, please visit their documentation at: Guardian
Guardian requires that you create an "Implementation Module". This module is your applications implementation for a particular type/configuration of token. You do this by useing Guardian in your module and adding the relevant configuration.
Add Guardian to your application
mix.exs
defp deps do
[
{:guardian, "~> 1.0"},
{:guardian_paseto, "~> 0.1.0"}
]
endCreate a module that uses Guardian
defmodule MyApp.Guardian do
use Guardian, otp_app: :my_app
def subject_for_token(resource, _claims) do
# You can use any value for the subject of your token but
# it should be useful in retrieving the resource later, see
# how it being used on `resource_from_claims/1` function.
# A unique `id` is a good subject, a non-unique email address
# is a poor subject.
sub = to_string(resource.id)
{:ok, sub}
end
def subject_for_token(_, _) do
{:error, :reason_for_error}
end
def resource_from_claims(claims) do
# Here we'll look up our resource from the claims, the subject can be
# found in the `"sub"` key. In `above subject_for_token/2` we returned
# the resource id so here we'll rely on that to look it up.
id = claims["sub"]
resource = MyApp.get_resource_by_id(id)
{:ok, resource}
end
def resource_from_claims(_claims) do
{:error, :reason_for_error}
end
endAdd your configuration
config :my_app, MyApp.Guardian,
issuer: "my_app",
secret_key: "Secret key. You can use `mix guardian.gen.secret` to get one"
allowed_algos: [:v2_local]With this level of configuration, you can have a working installation.
This package can be installed by adding guardian_paseto to your list of
dependencies in mix.exs:
def deps do
[
{:guardian_paseto, "~> 0.1.0"}
]
end
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