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Elixir SDK for the Stellar network.
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lib/tx_build/signer_key.ex
defmodule Stellar.TxBuild.SignerKey do
@moduledoc """
`SignerKey` struct definition.
"""
alias Stellar.KeyPair
alias StellarBase.XDR.{SignerKey, SignerKeyType, UInt256}
@behaviour Stellar.TxBuild.XDR
@type type :: :ed25519 | :sha256_hash | :pre_auth_tx
@type key :: String.t()
@type signer :: {type(), key()}
@type validation :: {:ok, any()} | {:error, atom()}
@type t :: %__MODULE__{type: type(), key: key()}
defstruct [:type, :key]
@impl true
def new(args, opts \\ [])
def new({type, key}, _opts) do
with {:ok, type} <- validate_signer_type(type),
{:ok, key} <- validate_signer_key({type, key}) do
%__MODULE__{type: type, key: key}
end
end
def new(_args, _opts), do: {:error, :invalid_signer_key}
@impl true
def to_xdr(%__MODULE__{type: :ed25519, key: key}) do
signer_type = SignerKeyType.new(:SIGNER_KEY_TYPE_ED25519)
key
|> KeyPair.raw_public_key()
|> UInt256.new()
|> SignerKey.new(signer_type)
end
def to_xdr(%__MODULE__{type: :sha256_hash, key: key}) do
signer_type = SignerKeyType.new(:SIGNER_KEY_TYPE_HASH_X)
key
|> (&:crypto.hash(:sha256, &1)).()
|> UInt256.new()
|> SignerKey.new(signer_type)
end
def to_xdr(%__MODULE__{type: :pre_auth_tx, key: key}) do
signer_type = SignerKeyType.new(:SIGNER_KEY_TYPE_PRE_AUTH_TX)
key
|> (&:crypto.hash(:sha256, &1)).()
|> UInt256.new()
|> SignerKey.new(signer_type)
end
@spec validate_signer_type(type :: type()) :: validation()
defp validate_signer_type(type) when type in ~w(ed25519 sha256_hash pre_auth_tx)a,
do: {:ok, type}
defp validate_signer_type(_type), do: {:error, :invalid_signer_type}
@spec validate_signer_key(signer :: signer()) :: validation()
defp validate_signer_key({:ed25519, key}) do
case KeyPair.validate_public_key(key) do
:ok -> {:ok, key}
_error -> {:error, :invalid_signer_key}
end
end
defp validate_signer_key({type, key})
when type in [:sha256_hash, :pre_auth_tx] and byte_size(key) == 64,
do: {:ok, key}
defp validate_signer_key(_type), do: {:error, :invalid_signer_key}
end