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lib/cloak/fields/time.ex
defmodule Cloak.Fields.Time do
@moduledoc """
An `Ecto.Type` to encrypt `Time` fields.
## Migration
The database field must be of type `:binary`.
add :encrypted_field, :binary
## Usage
Define an `Encrypted.Time` module in your project:
defmodule MyApp.Encrypted.Time do
use Cloak.Fields.Time, vault: MyApp.Vault
end
Then, define the type of your desired fields:
schema "table_name" do
field :encrypted_field, MyApp.Encrypted.Time
end
"""
@doc false
defmacro __using__(opts) do
opts = Keyword.merge(opts, vault: Keyword.fetch!(opts, :vault))
quote location: :keep do
use Cloak.Field, unquote(opts)
def cast(value), do: Ecto.Type.cast(:time, value)
def before_encrypt(value) do
case Ecto.Type.cast(:time, value) do
{:ok, time} -> to_string(time)
_error -> :error
end
end
def after_decrypt(value) do
case Time.from_iso8601(value) do
{:ok, time} -> time
_error -> :error
end
end
end
end
end