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lib/cloak/fields/integer.ex
defmodule Cloak.Fields.Integer do
@moduledoc """
An `Ecto.Type` to encrypt integer fields.
## Migration
The database field must be of type `:binary`.
add :encrypted_field, :binary
## Usage
Define an `Encrypted.Integer` module in your project:
defmodule MyApp.Encrypted.Integer do
use Cloak.Fields.Integer, vault: MyApp.Vault
end
Then, define the type of your desired fields:
schema "table_name" do
field :encrypted_field, MyApp.Encrypted.Integer
end
"""
@doc false
defmacro __using__(opts) do
opts = Keyword.merge(opts, vault: Keyword.fetch!(opts, :vault))
quote do
use Cloak.Field, unquote(opts)
def cast(value) do
Ecto.Type.cast(:integer, value)
end
def after_decrypt(value), do: String.to_integer(value)
end
end
end