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lib/cloak/fields/date.ex
defmodule Cloak.Fields.Date do
@moduledoc """
An `Ecto.Type` to encrypt `Date` fields.
## Migration
The database field must be of type `:binary`.
add :encrypted_field, :binary
## Usage
Define an `Encrypted.Date` module in your project:
defmodule MyApp.Encrypted.Date do
use Cloak.Fields.Date, vault: MyApp.Vault
end
Then, define the type of your desired fields:
schema "table_name" do
field :encrypted_field, MyApp.Encrypted.Date
end
"""
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(:date, value)
def before_encrypt(value) do
case Ecto.Type.cast(:date, value) do
{:ok, date} -> to_string(date)
_error -> :error
end
end
def after_decrypt(value) do
case Date.from_iso8601(value) do
{:ok, date} -> date
_error -> :error
end
end
end
end
end