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A comprehensive Web3 library for interacting with smart contracts on Ethereum using Elixir.

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ethers lib ethers transaction helpers.ex
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lib/ethers/transaction/helpers.ex 

defmodule Ethers.Transaction.Helpers do

  @moduledoc false



  @spec validate_non_neg_integer(term()) :: :ok | {:error, :expected_non_neg_integer_value}

  def validate_non_neg_integer(value) when is_integer(value) and value >= 0, do: :ok

  def validate_non_neg_integer(_), do: {:error, :expected_non_neg_integer_value}



  @spec validate_binary(term()) :: :ok | {:error, :expected_binary_value}

  def validate_binary(value) when is_binary(value), do: :ok

  def validate_binary(_), do: {:error, :expected_binary_value}



  @spec validate_address(term()) :: :ok | {:error, :invalid_address_length | :invalid_address}

  def validate_address("0x" <> address) do

    case Ethers.Utils.hex_decode(address) do

      {:ok, <<_address_bin::binary-20>>} -> :ok

      {:ok, _bad_address} -> {:error, :invalid_address_length}

      _ -> {:error, :invalid_address}

    end

  end



  def validate_address(nil), do: :ok

  def validate_address(_invalid), do: {:error, :invalid_address}



  @spec validate_common_fields(map()) ::

          :ok | {:error, :expected_non_neg_integer_value | :expected_binary_value}

  def validate_common_fields(params) do

    with :ok <- validate_non_neg_integer(params.chain_id),

         :ok <- validate_non_neg_integer(params.nonce),

         :ok <- validate_address(params[:to]) do

      validate_non_neg_integer(params.gas)

    end

  end

end