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   1 # Pleroma: A lightweight social networking server
   2 # Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
   3 # SPDX-License-Identifier: AGPL-3.0-only
   4
   5 defmodule Pleroma.Web.Auth.PleromaAuthenticator do
   6   alias Pleroma.Registration
   7   alias Pleroma.Repo
   8   alias Pleroma.User
   9   alias Pleroma.Web.Plugs.AuthenticationPlug
  10
  11   import Pleroma.Web.Auth.Authenticator,
  12     only: [fetch_credentials: 1, fetch_user: 1]
  13
  14   @behaviour Pleroma.Web.Auth.Authenticator
  15
  16   def get_user(%Plug.Conn{} = conn) do
  17     with {:ok, {name, password}} <- fetch_credentials(conn),
  18          {_, %User{} = user} <- {:user, fetch_user(name)},
  19          {_, true} <- {:checkpw, AuthenticationPlug.checkpw(password, user.password_hash)},
  20          {:ok, user} <- AuthenticationPlug.maybe_update_password(user, password) do
  21       {:ok, user}
  22     else
  23       {:error, _reason} = error -> error
  24       error -> {:error, error}
  25     end
  26   end
  27
  28   @doc """
  29   Gets or creates Pleroma.Registration record from Ueberauth assigns.
  30   Note: some strategies (like `keycloak`) might need extra configuration to fill `uid` from callback response —
  31     see [`docs/config.md`](docs/config.md).
  32   """
  33   def get_registration(%Plug.Conn{assigns: %{ueberauth_auth: %{uid: nil}}}),
  34     do: {:error, :missing_uid}
  35
  36   def get_registration(%Plug.Conn{
  37         assigns: %{ueberauth_auth: %{provider: provider, uid: uid} = auth}
  38       }) do
  39     registration = Registration.get_by_provider_uid(provider, uid)
  40
  41     if registration do
  42       {:ok, registration}
  43     else
  44       info = auth.info
  45
  46       %Registration{}
  47       |> Registration.changeset(%{
  48         provider: to_string(provider),
  49         uid: to_string(uid),
  50         info: %{
  51           "nickname" => info.nickname,
  52           "email" => info.email,
  53           "name" => info.name,
  54           "description" => info.description
  55         }
  56       })
  57       |> Repo.insert()
  58     end
  59   end
  60
  61   def get_registration(%Plug.Conn{} = _conn), do: {:error, :missing_credentials}
  62
  63   @doc "Creates Pleroma.User record basing on params and Pleroma.Registration record."
  64   def create_from_registration(
  65         %Plug.Conn{params: %{"authorization" => registration_attrs}},
  66         %Registration{} = registration
  67       ) do
  68     nickname = value([registration_attrs["nickname"], Registration.nickname(registration)])
  69     email = value([registration_attrs["email"], Registration.email(registration)])
  70     name = value([registration_attrs["name"], Registration.name(registration)]) || nickname
  71     bio = value([registration_attrs["bio"], Registration.description(registration)]) || ""
  72
  73     random_password = :crypto.strong_rand_bytes(64) |> Base.encode64()
  74
  75     with {:ok, new_user} <-
  76            User.register_changeset(
  77              %User{},
  78              %{
  79                email: email,
  80                nickname: nickname,
  81                name: name,
  82                bio: bio,
  83                password: random_password,
  84                password_confirmation: random_password
  85              },
  86              external: true,
  87              need_confirmation: false
  88            )
  89            |> Repo.insert(),
  90          {:ok, _} <-
  91            Registration.changeset(registration, %{user_id: new_user.id}) |> Repo.update() do
  92       {:ok, new_user}
  93     end
  94   end
  95
  96   defp value(list), do: Enum.find(list, &(to_string(&1) != ""))
  97
  98   def handle_error(%Plug.Conn{} = _conn, error) do
  99     error
 100   end
 101
 102   def auth_template, do: nil
 103
 104   def oauth_consumer_template, do: nil
 105 end