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Low-level elixir library to read, write, hash, and sign XDR primitive constructs used in the Stellar network.

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stellar_base lib xdr keys public_key.ex
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lib/xdr/keys/public_key.ex 

defmodule Stellar.XDR.PublicKey do

  @moduledoc """

  Representation of Stellar `PublicKey` type.

  """

  alias Stellar.XDR.{UInt256, PublicKeyType}



  @behaviour XDR.Declaration



  @arms [PUBLIC_KEY_TYPE_ED25519: UInt256]



  @type t :: %__MODULE__{public_key: UInt256.t(), type: PublicKeyType.t()}



  defstruct [:public_key, :type]



  @spec new(public_key :: UInt256.t(), type :: PublicKeyType.t() | nil) :: t()

  def new(%UInt256{} = public_key, %PublicKeyType{} = type),

    do: %__MODULE__{public_key: public_key, type: type}



  @impl true

  def encode_xdr(%__MODULE__{public_key: public_key, type: type}) do

    type

    |> XDR.Union.new(@arms, public_key)

    |> XDR.Union.encode_xdr()

  end



  @impl true

  def encode_xdr!(%__MODULE__{public_key: public_key, type: type}) do

    type

    |> XDR.Union.new(@arms, public_key)

    |> XDR.Union.encode_xdr!()

  end



  @impl true

  def decode_xdr(bytes, spec \\ union_spec())



  def decode_xdr(bytes, spec) do

    case XDR.Union.decode_xdr(bytes, spec) do

      {:ok, {{type, key}, rest}} -> {:ok, {new(key, type), rest}}

      error -> error

    end

  end



  @impl true

  def decode_xdr!(bytes, spec \\ union_spec())



  def decode_xdr!(bytes, spec) do

    {{type, key}, rest} = XDR.Union.decode_xdr!(bytes, spec)

    {new(key, type), rest}

  end



  @spec union_spec() :: XDR.Union.t()

  defp union_spec do

    :PUBLIC_KEY_TYPE_ED25519

    |> PublicKeyType.new()

    |> XDR.Union.new(@arms)

  end

end