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Useful package for dealing with user authentication and signup
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lib/guard/guardian.ex
defmodule Guard.Guardian do
use Guardian, otp_app: :guard,
permissions: Application.get_env(:guard, Guard.Guardian)[:permissions]
use Guardian.Permissions.Bitwise
alias Guard.{Repo, User}
def subject_for_token(%User{} = user, _claims) do
{:ok, "User:#{user.id}"}
end
def subject_for_token(_, _), do: {:error, :unknown_resource}
def load_resource("User:" <> id), do: Repo.get!(User, id)
def resource_from_claims(%{"sub" => sub} = _claims) do
{:ok, load_resource(sub)}
end
def resource_from_claims(_claims), do: {:error, :unknown_resource}
def build_claims(claims, _resource, opts) do
claims =
claims
|> encode_permissions_into_claims!(Keyword.get(opts, :perms))
{:ok, claims}
end
end