102 lines
2.8 KiB
Elixir
102 lines
2.8 KiB
Elixir
defmodule BallsPDS.JWT do
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alias BallsPDS.WAC
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require Logger
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use Joken.Config
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def generate_my_jwk() do
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raw_private_key =
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Base.decode16!(Application.get_env(:balls_pds, :owner_private_key), case: :lower)
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generate_jwk(raw_private_key)
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end
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def generate_jwk(raw_private_key) when is_binary(raw_private_key) do
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public_key = :crypto.generate_key(:eddsa, :ed25519, raw_private_key) |> elem(0)
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%{
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"kty" => "OKP",
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"crv" => "Ed25519",
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"d" => Base.url_encode64(raw_private_key, padding: false),
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"x" => Base.url_encode64(public_key, padding: false)
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}
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end
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def query_public_jwk(ap_id, key_id) do
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case WAC.cached_query_public_key(ap_id, key_id) do
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{:ok, raw_public_key} ->
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encoded_key = Base.url_encode64(raw_public_key, padding: false)
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{:ok,
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%{
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# Key Type: Octet Key Pair
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"kty" => "OKP",
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# Curve: Ed25519
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"crv" => "Ed25519",
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# Public Key (Base64Url-encoded)
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"x" => encoded_key
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}}
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end
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end
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defp get_kid(jwt) when is_binary(jwt) do
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with {:kid, %{fields: %{"kid" => kid}}} <- {:kid, JOSE.JWT.peek_protected(jwt)} do
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kid
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else
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{:kid, protected} ->
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Logger.debug("protected: #{inspect(protected)}")
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nil
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error ->
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Logger.error(inspect(error))
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nil
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end
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end
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def extract_key_info(jwt) when is_binary(jwt) do
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with {:subject, {:ok, %{"sub" => subject}}} <- {:subject, JOSE.JWT.peek_payload(jwt)},
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{:kid, kid} <- {:kid, get_kid(jwt)} do
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{:ok, %{subject: subject, id: kid}}
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else
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{err, {:error, error}} ->
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Logger.error("extracting key info from JWT: #{err}: #{inspect(error)}")
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{:error, error}
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end
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end
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def generate_jwt(jwk, days) when is_integer(days) and days > 0 do
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Logger.debug("Creating signer.")
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signer = Joken.Signer.create("EdDSA", jwk, %{"kid" => "key-1"})
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id = Application.get_env(:balls_pds, :owner_ap_id)
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claims =
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default_claims(%{
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"aud" => Application.get_env(:balls_pds, :owner_ap_id),
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"iat" => DateTime.utc_now() |> DateTime.to_unix(),
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"exp" => DateTime.utc_now() |> DateTime.add(30, :day) |> DateTime.to_unix()
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})
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additional_claims = %{"sub" => id}
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Logger.debug("Signing with claims: #{inspect(claims)}")
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Joken.generate_and_sign!(claims, additional_claims, signer)
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end
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def generate_jwt(days) when is_integer(days) and days > 0 do
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jwk = generate_my_jwk()
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generate_jwt(jwk, days)
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end
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def verify_jwt(jwt, jwk) do
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public_jwk = Map.drop(jwk, ["d"])
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signer = Joken.Signer.create("EdDSA", public_jwk)
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Logger.debug("KID: #{get_kid(jwt)}")
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case Joken.verify_and_validate(public_jwk, jwt, signer) do
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{:ok, claims} -> {:ok, claims}
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{:error, reason} -> {:error, reason}
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end
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end
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end
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