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Robust user authentication solution

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

defmodule PowInvitation.Ecto.Schema do

  @moduledoc false

  use Pow.Extension.Ecto.Schema.Base

  alias Ecto.Changeset

  alias Pow.UUID



  @impl true

  def attrs(_config) do

    [

      {:invitation_token, :string},

      {:invitation_accepted_at, :utc_datetime}

    ]

  end



  @impl true

  def assocs(_config) do

    [

      {:belongs_to, :invited_by, :users},

      {:has_many, :invited_users, :users, foreign_key: :invited_by_id}

    ]

  end



  @impl true

  def indexes(_config) do

    [{:invitation_token, true}]

  end



  @doc false

  defmacro __using__(_config) do

    quote do

      def invite_changeset(changeset, invited_by, attrs), do: pow_invite_changeset(changeset, invited_by, attrs)



      defdelegate pow_invite_changeset(changeset, invited_by, attrs), to: unquote(__MODULE__), as: :invite_changeset



      defoverridable invite_changeset: 3

    end

  end



  @spec invite_changeset(Ecto.Schema.t() | Changeset.t(), Ecto.Schema.t(), map()) :: Changeset.t()

  def invite_changeset(%Changeset{data: user} = changeset, invited_by, attrs) do

    changeset

    |> user.__struct__.pow_user_id_field_changeset(attrs)

    |> invitation_token_changeset()

    |> invited_by_changeset(invited_by)

  end

  def invite_changeset(user, invited_by, attrs) do

    user

    |> Changeset.change()

    |> invite_changeset(invited_by, attrs)

  end



  defp invitation_token_changeset(changeset) do

    changeset

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

    |> Changeset.unique_constraint(:invitation_token)

  end



  defp invited_by_changeset(%Changeset{data: data} = changeset, invited_by) do

    data = Ecto.build_assoc(invited_by, :invited_users, data)



    Changeset.assoc_constraint(%{changeset | data: data}, :invited_by)

  end



  @spec accept_invitation_changeset(Ecto.Schema.t() | Changeset.t(), map()) :: Changeset.t()

  def accept_invitation_changeset(%Changeset{data: %user_mod{}} = changeset, attrs) do

    accepted_at = Pow.Ecto.Schema.__timestamp_for__(user_mod, :invitation_accepted_at)



    changeset

    |> user_mod.changeset(attrs)

    |> Changeset.change(invitation_accepted_at: accepted_at)

  end

  def accept_invitation_changeset(user, attrs) do

    user

    |> Changeset.change()

    |> accept_invitation_changeset(attrs)

  end

end