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Robust user authentication solution

Security advisory: This version has known vulnerabilities. View advisories
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pow lib extensions email_confirmation ecto schema.ex
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lib/extensions/email_confirmation/ecto/schema.ex 

defmodule PowEmailConfirmation.Ecto.Schema do

  @moduledoc false

  use Pow.Extension.Ecto.Schema.Base

  alias Ecto.Changeset

  alias Pow.{Extension.Ecto.Schema, UUID}



  def validate!(_config, module) do

    Schema.require_schema_field!(module, :email, PowEmailConfirmation)

  end



  def attrs(_config) do

    [

      {:email_confirmation_token, :string},

      {:email_confirmed_at, :utc_datetime},

      {:unconfirmed_email, :string}

    ]

  end



  def indexes(_config) do

    [{:email_confirmation_token, true}]

  end



  def changeset(%{errors: []} = changeset, _attrs, _config) do

    current_email = changeset.data.email

    new_email     = Changeset.get_field(changeset, :email)

    state         = Ecto.get_meta(changeset.data, :state)



    changeset

    |> maybe_put_email_confirmation_token(state, current_email, new_email)

    |> maybe_set_unconfirmed_email(state, current_email, new_email)

  end

  def changeset(changeset, _attrs, _config), do: changeset



  @spec confirm_email_changeset(Ecto.Schema.t() | Changeset.t()) :: Changeset.t()

  def confirm_email_changeset(user_or_changeset) do

    user_or_changeset

    |> Changeset.change()

    |> maybe_confirm_email()

  end



  defp maybe_confirm_email(%{data: %{unconfirmed_email: unconfirmed_email}} = changeset) when not is_nil(unconfirmed_email) do

    confirm_email(changeset)

  end

  defp maybe_confirm_email(%{data: %{email_confirmed_at: confirmed_at}} = changeset) when is_nil(confirmed_at) do

    confirm_email(changeset)

  end

  defp maybe_confirm_email(changeset), do: changeset



  defp confirm_email(changeset) do

    changes   = [

      email_confirmed_at: DateTime.utc_now(),

      email: changeset.data.unconfirmed_email || changeset.data.email,

      unconfirmed_email: nil]



    changeset

    |> Changeset.change(changes)

    |> Changeset.validate_required([:email, :email_confirmed_at])

    |> Changeset.unique_constraint(:email)

  end



  defp maybe_put_email_confirmation_token(changeset, state, current_email, new_email) when current_email != new_email or state == :built do

    changeset

    |> Changeset.put_change(:email_confirmation_token, UUID.generate())

    |> Changeset.validate_required([:email_confirmation_token])

    |> Changeset.unique_constraint(:email_confirmation_token)

  end

  defp maybe_put_email_confirmation_token(changeset, _state, _current_email, _new_email), do: changeset



  defp maybe_set_unconfirmed_email(changeset, :loaded, current_email, new_email) when current_email != new_email do

    changeset

    |> Changeset.put_change(:email, current_email)

    |> Changeset.put_change(:unconfirmed_email, new_email)

  end

  defp maybe_set_unconfirmed_email(changeset, _state, _current_email, _new_email), do: changeset

end