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611 lines
20 KiB
Elixir
611 lines
20 KiB
Elixir
# Pleroma: A lightweight social networking server
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# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
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# SPDX-License-Identifier: AGPL-3.0-only
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defmodule Pleroma.Web.OAuth.OAuthController do
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use Pleroma.Web, :controller
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alias Pleroma.Helpers.UriHelper
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alias Pleroma.Maps
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alias Pleroma.MFA
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alias Pleroma.Plugs.RateLimiter
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alias Pleroma.Registration
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alias Pleroma.Repo
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alias Pleroma.User
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alias Pleroma.Web.Auth.Authenticator
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alias Pleroma.Web.ControllerHelper
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alias Pleroma.Web.OAuth.App
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alias Pleroma.Web.OAuth.Authorization
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alias Pleroma.Web.OAuth.MFAController
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alias Pleroma.Web.OAuth.MFAView
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alias Pleroma.Web.OAuth.OAuthView
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alias Pleroma.Web.OAuth.Scopes
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alias Pleroma.Web.OAuth.Token
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alias Pleroma.Web.OAuth.Token.Strategy.RefreshToken
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alias Pleroma.Web.OAuth.Token.Strategy.Revoke, as: RevokeToken
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require Logger
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if Pleroma.Config.oauth_consumer_enabled?(), do: plug(Ueberauth)
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plug(:fetch_session)
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plug(:fetch_flash)
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plug(:skip_plug, [Pleroma.Plugs.OAuthScopesPlug, Pleroma.Plugs.EnsurePublicOrAuthenticatedPlug])
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plug(RateLimiter, [name: :authentication] when action == :create_authorization)
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action_fallback(Pleroma.Web.OAuth.FallbackController)
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@oob_token_redirect_uri "urn:ietf:wg:oauth:2.0:oob"
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# Note: this definition is only called from error-handling methods with `conn.params` as 2nd arg
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def authorize(%Plug.Conn{} = conn, %{"authorization" => _} = params) do
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{auth_attrs, params} = Map.pop(params, "authorization")
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authorize(conn, Map.merge(params, auth_attrs))
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end
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def authorize(%Plug.Conn{assigns: %{token: %Token{}}} = conn, %{"force_login" => _} = params) do
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if ControllerHelper.truthy_param?(params["force_login"]) do
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do_authorize(conn, params)
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else
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handle_existing_authorization(conn, params)
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end
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end
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# Note: the token is set in oauth_plug, but the token and client do not always go together.
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# For example, MastodonFE's token is set if user requests with another client,
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# after user already authorized to MastodonFE.
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# So we have to check client and token.
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def authorize(
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%Plug.Conn{assigns: %{token: %Token{} = token}} = conn,
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%{"client_id" => client_id} = params
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) do
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with %Token{} = t <- Repo.get_by(Token, token: token.token) |> Repo.preload(:app),
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^client_id <- t.app.client_id do
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handle_existing_authorization(conn, params)
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else
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_ -> do_authorize(conn, params)
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end
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end
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def authorize(%Plug.Conn{} = conn, params), do: do_authorize(conn, params)
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defp do_authorize(%Plug.Conn{} = conn, params) do
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app = Repo.get_by(App, client_id: params["client_id"])
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available_scopes = (app && app.scopes) || []
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scopes = Scopes.fetch_scopes(params, available_scopes)
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scopes =
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if scopes == [] do
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available_scopes
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else
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scopes
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end
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# Note: `params` might differ from `conn.params`; use `@params` not `@conn.params` in template
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render(conn, Authenticator.auth_template(), %{
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response_type: params["response_type"],
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client_id: params["client_id"],
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available_scopes: available_scopes,
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scopes: scopes,
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redirect_uri: params["redirect_uri"],
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state: params["state"],
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params: params
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})
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end
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defp handle_existing_authorization(
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%Plug.Conn{assigns: %{token: %Token{} = token}} = conn,
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%{"redirect_uri" => @oob_token_redirect_uri}
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) do
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render(conn, "oob_token_exists.html", %{token: token})
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end
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defp handle_existing_authorization(
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%Plug.Conn{assigns: %{token: %Token{} = token}} = conn,
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%{} = params
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) do
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app = Repo.preload(token, :app).app
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redirect_uri =
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if is_binary(params["redirect_uri"]) do
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params["redirect_uri"]
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else
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default_redirect_uri(app)
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end
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if redirect_uri in String.split(app.redirect_uris) do
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redirect_uri = redirect_uri(conn, redirect_uri)
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url_params = %{access_token: token.token}
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url_params = Maps.put_if_present(url_params, :state, params["state"])
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url = UriHelper.modify_uri_params(redirect_uri, url_params)
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redirect(conn, external: url)
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else
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conn
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|> put_flash(:error, dgettext("errors", "Unlisted redirect_uri."))
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|> redirect(external: redirect_uri(conn, redirect_uri))
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end
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end
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def create_authorization(
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%Plug.Conn{} = conn,
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%{"authorization" => _} = params,
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opts \\ []
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) do
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with {:ok, auth, user} <- do_create_authorization(conn, params, opts[:user]),
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{:mfa_required, _, _, false} <- {:mfa_required, user, auth, MFA.require?(user)} do
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after_create_authorization(conn, auth, params)
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else
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error ->
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handle_create_authorization_error(conn, error, params)
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end
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end
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def after_create_authorization(%Plug.Conn{} = conn, %Authorization{} = auth, %{
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"authorization" => %{"redirect_uri" => @oob_token_redirect_uri}
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}) do
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# Enforcing the view to reuse the template when calling from other controllers
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conn
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|> put_view(OAuthView)
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|> render("oob_authorization_created.html", %{auth: auth})
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end
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def after_create_authorization(%Plug.Conn{} = conn, %Authorization{} = auth, %{
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"authorization" => %{"redirect_uri" => redirect_uri} = auth_attrs
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}) do
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app = Repo.preload(auth, :app).app
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# An extra safety measure before we redirect (also done in `do_create_authorization/2`)
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if redirect_uri in String.split(app.redirect_uris) do
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redirect_uri = redirect_uri(conn, redirect_uri)
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url_params = %{code: auth.token}
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url_params = Maps.put_if_present(url_params, :state, auth_attrs["state"])
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url = UriHelper.modify_uri_params(redirect_uri, url_params)
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redirect(conn, external: url)
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else
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conn
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|> put_flash(:error, dgettext("errors", "Unlisted redirect_uri."))
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|> redirect(external: redirect_uri(conn, redirect_uri))
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end
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end
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defp handle_create_authorization_error(
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%Plug.Conn{} = conn,
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{:error, scopes_issue},
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%{"authorization" => _} = params
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)
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when scopes_issue in [:unsupported_scopes, :missing_scopes] do
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# Per https://github.com/tootsuite/mastodon/blob/
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# 51e154f5e87968d6bb115e053689767ab33e80cd/app/controllers/api/base_controller.rb#L39
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conn
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|> put_flash(:error, dgettext("errors", "This action is outside the authorized scopes"))
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|> put_status(:unauthorized)
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|> authorize(params)
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end
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defp handle_create_authorization_error(
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%Plug.Conn{} = conn,
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{:account_status, :confirmation_pending},
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%{"authorization" => _} = params
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) do
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conn
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|> put_flash(:error, dgettext("errors", "Your login is missing a confirmed e-mail address"))
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|> put_status(:forbidden)
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|> authorize(params)
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end
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defp handle_create_authorization_error(
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%Plug.Conn{} = conn,
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{:mfa_required, user, auth, _},
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params
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) do
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{:ok, token} = MFA.Token.create(user, auth)
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data = %{
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"mfa_token" => token.token,
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"redirect_uri" => params["authorization"]["redirect_uri"],
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"state" => params["authorization"]["state"]
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}
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MFAController.show(conn, data)
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end
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defp handle_create_authorization_error(
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%Plug.Conn{} = conn,
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{:account_status, :password_reset_pending},
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%{"authorization" => _} = params
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) do
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conn
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|> put_flash(:error, dgettext("errors", "Password reset is required"))
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|> put_status(:forbidden)
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|> authorize(params)
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end
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defp handle_create_authorization_error(
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%Plug.Conn{} = conn,
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{:account_status, :deactivated},
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%{"authorization" => _} = params
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) do
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conn
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|> put_flash(:error, dgettext("errors", "Your account is currently disabled"))
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|> put_status(:forbidden)
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|> authorize(params)
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end
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defp handle_create_authorization_error(%Plug.Conn{} = conn, error, %{"authorization" => _}) do
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Authenticator.handle_error(conn, error)
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end
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@doc "Renew access_token with refresh_token"
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def token_exchange(
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%Plug.Conn{} = conn,
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%{"grant_type" => "refresh_token", "refresh_token" => token} = _params
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) do
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with {:ok, app} <- Token.Utils.fetch_app(conn),
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{:ok, %{user: user} = token} <- Token.get_by_refresh_token(app, token),
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{:ok, token} <- RefreshToken.grant(token) do
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json(conn, OAuthView.render("token.json", %{user: user, token: token}))
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else
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_error -> render_invalid_credentials_error(conn)
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end
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end
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def token_exchange(%Plug.Conn{} = conn, %{"grant_type" => "authorization_code"} = params) do
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with {:ok, app} <- Token.Utils.fetch_app(conn),
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fixed_token = Token.Utils.fix_padding(params["code"]),
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{:ok, auth} <- Authorization.get_by_token(app, fixed_token),
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%User{} = user <- User.get_cached_by_id(auth.user_id),
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{:ok, token} <- Token.exchange_token(app, auth) do
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json(conn, OAuthView.render("token.json", %{user: user, token: token}))
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else
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error ->
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handle_token_exchange_error(conn, error)
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end
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end
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def token_exchange(
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%Plug.Conn{} = conn,
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%{"grant_type" => "password"} = params
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) do
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with {:ok, %User{} = user} <- Authenticator.get_user(conn),
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{:ok, app} <- Token.Utils.fetch_app(conn),
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requested_scopes <- Scopes.fetch_scopes(params, app.scopes),
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{:ok, token} <- login(user, app, requested_scopes) do
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json(conn, OAuthView.render("token.json", %{user: user, token: token}))
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else
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error ->
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handle_token_exchange_error(conn, error)
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end
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end
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def token_exchange(
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%Plug.Conn{} = conn,
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%{"grant_type" => "password", "name" => name, "password" => _password} = params
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) do
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params =
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params
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|> Map.delete("name")
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|> Map.put("username", name)
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token_exchange(conn, params)
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end
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def token_exchange(%Plug.Conn{} = conn, %{"grant_type" => "client_credentials"} = _params) do
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with {:ok, app} <- Token.Utils.fetch_app(conn),
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{:ok, auth} <- Authorization.create_authorization(app, %User{}),
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{:ok, token} <- Token.exchange_token(app, auth) do
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json(conn, OAuthView.render("token.json", %{token: token}))
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else
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_error ->
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handle_token_exchange_error(conn, :invalid_credentails)
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end
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end
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# Bad request
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def token_exchange(%Plug.Conn{} = conn, params), do: bad_request(conn, params)
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defp handle_token_exchange_error(%Plug.Conn{} = conn, {:mfa_required, user, auth, _}) do
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conn
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|> put_status(:forbidden)
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|> json(build_and_response_mfa_token(user, auth))
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end
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defp handle_token_exchange_error(%Plug.Conn{} = conn, {:account_status, :deactivated}) do
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render_error(
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conn,
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:forbidden,
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"Your account is currently disabled",
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%{},
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"account_is_disabled"
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)
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end
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defp handle_token_exchange_error(
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%Plug.Conn{} = conn,
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{:account_status, :password_reset_pending}
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) do
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render_error(
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conn,
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:forbidden,
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"Password reset is required",
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%{},
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"password_reset_required"
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)
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end
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defp handle_token_exchange_error(%Plug.Conn{} = conn, {:account_status, :confirmation_pending}) do
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render_error(
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conn,
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:forbidden,
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"Your login is missing a confirmed e-mail address",
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%{},
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"missing_confirmed_email"
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)
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end
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defp handle_token_exchange_error(%Plug.Conn{} = conn, {:account_status, :approval_pending}) do
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render_error(
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conn,
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:forbidden,
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"Your account is awaiting approval.",
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%{},
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"awaiting_approval"
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)
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end
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defp handle_token_exchange_error(%Plug.Conn{} = conn, _error) do
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render_invalid_credentials_error(conn)
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end
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def token_revoke(%Plug.Conn{} = conn, %{"token" => _token} = params) do
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with {:ok, app} <- Token.Utils.fetch_app(conn),
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{:ok, _token} <- RevokeToken.revoke(app, params) do
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json(conn, %{})
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else
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_error ->
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# RFC 7009: invalid tokens [in the request] do not cause an error response
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json(conn, %{})
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end
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end
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def token_revoke(%Plug.Conn{} = conn, params), do: bad_request(conn, params)
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# Response for bad request
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defp bad_request(%Plug.Conn{} = conn, _) do
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render_error(conn, :internal_server_error, "Bad request")
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end
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@doc "Prepares OAuth request to provider for Ueberauth"
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def prepare_request(%Plug.Conn{} = conn, %{
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"provider" => provider,
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"authorization" => auth_attrs
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}) do
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scope =
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auth_attrs
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|> Scopes.fetch_scopes([])
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|> Scopes.to_string()
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state =
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auth_attrs
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|> Map.delete("scopes")
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|> Map.put("scope", scope)
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|> Jason.encode!()
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params =
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auth_attrs
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|> Map.drop(~w(scope scopes client_id redirect_uri))
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|> Map.put("state", state)
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# Handing the request to Ueberauth
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redirect(conn, to: o_auth_path(conn, :request, provider, params))
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end
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def request(%Plug.Conn{} = conn, params) do
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message =
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if params["provider"] do
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dgettext("errors", "Unsupported OAuth provider: %{provider}.",
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provider: params["provider"]
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)
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else
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dgettext("errors", "Bad OAuth request.")
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end
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conn
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|> put_flash(:error, message)
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|> redirect(to: "/")
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end
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def callback(%Plug.Conn{assigns: %{ueberauth_failure: failure}} = conn, params) do
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params = callback_params(params)
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messages = for e <- Map.get(failure, :errors, []), do: e.message
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message = Enum.join(messages, "; ")
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conn
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|> put_flash(
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:error,
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dgettext("errors", "Failed to authenticate: %{message}.", message: message)
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)
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|> redirect(external: redirect_uri(conn, params["redirect_uri"]))
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end
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def callback(%Plug.Conn{} = conn, params) do
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params = callback_params(params)
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with {:ok, registration} <- Authenticator.get_registration(conn) do
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auth_attrs = Map.take(params, ~w(client_id redirect_uri scope scopes state))
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case Repo.get_assoc(registration, :user) do
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{:ok, user} ->
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create_authorization(conn, %{"authorization" => auth_attrs}, user: user)
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_ ->
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registration_params =
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Map.merge(auth_attrs, %{
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"nickname" => Registration.nickname(registration),
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"email" => Registration.email(registration)
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})
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conn
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|> put_session_registration_id(registration.id)
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|> registration_details(%{"authorization" => registration_params})
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end
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else
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error ->
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Logger.debug(inspect(["OAUTH_ERROR", error, conn.assigns]))
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conn
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|> put_flash(:error, dgettext("errors", "Failed to set up user account."))
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|> redirect(external: redirect_uri(conn, params["redirect_uri"]))
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end
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end
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defp callback_params(%{"state" => state} = params) do
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Map.merge(params, Jason.decode!(state))
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end
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def registration_details(%Plug.Conn{} = conn, %{"authorization" => auth_attrs}) do
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render(conn, "register.html", %{
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client_id: auth_attrs["client_id"],
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redirect_uri: auth_attrs["redirect_uri"],
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state: auth_attrs["state"],
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scopes: Scopes.fetch_scopes(auth_attrs, []),
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nickname: auth_attrs["nickname"],
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email: auth_attrs["email"]
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})
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end
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def register(%Plug.Conn{} = conn, %{"authorization" => _, "op" => "connect"} = params) do
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with registration_id when not is_nil(registration_id) <- get_session_registration_id(conn),
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%Registration{} = registration <- Repo.get(Registration, registration_id),
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{_, {:ok, auth, _user}} <-
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{:create_authorization, do_create_authorization(conn, params)},
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%User{} = user <- Repo.preload(auth, :user).user,
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{:ok, _updated_registration} <- Registration.bind_to_user(registration, user) do
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conn
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|> put_session_registration_id(nil)
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|> after_create_authorization(auth, params)
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else
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{:create_authorization, error} ->
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{:register, handle_create_authorization_error(conn, error, params)}
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_ ->
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{:register, :generic_error}
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end
|
|
end
|
|
|
|
def register(%Plug.Conn{} = conn, %{"authorization" => _, "op" => "register"} = params) do
|
|
with registration_id when not is_nil(registration_id) <- get_session_registration_id(conn),
|
|
%Registration{} = registration <- Repo.get(Registration, registration_id),
|
|
{:ok, user} <- Authenticator.create_from_registration(conn, registration) do
|
|
conn
|
|
|> put_session_registration_id(nil)
|
|
|> create_authorization(
|
|
params,
|
|
user: user
|
|
)
|
|
else
|
|
{:error, changeset} ->
|
|
message =
|
|
Enum.map(changeset.errors, fn {field, {error, _}} ->
|
|
"#{field} #{error}"
|
|
end)
|
|
|> Enum.join("; ")
|
|
|
|
message =
|
|
String.replace(
|
|
message,
|
|
"ap_id has already been taken",
|
|
"nickname has already been taken"
|
|
)
|
|
|
|
conn
|
|
|> put_status(:forbidden)
|
|
|> put_flash(:error, "Error: #{message}.")
|
|
|> registration_details(params)
|
|
|
|
_ ->
|
|
{:register, :generic_error}
|
|
end
|
|
end
|
|
|
|
defp do_create_authorization(conn, auth_attrs, user \\ nil)
|
|
|
|
defp do_create_authorization(
|
|
%Plug.Conn{} = conn,
|
|
%{
|
|
"authorization" =>
|
|
%{
|
|
"client_id" => client_id,
|
|
"redirect_uri" => redirect_uri
|
|
} = auth_attrs
|
|
},
|
|
user
|
|
) do
|
|
with {_, {:ok, %User{} = user}} <-
|
|
{:get_user, (user && {:ok, user}) || Authenticator.get_user(conn)},
|
|
%App{} = app <- Repo.get_by(App, client_id: client_id),
|
|
true <- redirect_uri in String.split(app.redirect_uris),
|
|
requested_scopes <- Scopes.fetch_scopes(auth_attrs, app.scopes),
|
|
{:ok, auth} <- do_create_authorization(user, app, requested_scopes) do
|
|
{:ok, auth, user}
|
|
end
|
|
end
|
|
|
|
defp do_create_authorization(%User{} = user, %App{} = app, requested_scopes)
|
|
when is_list(requested_scopes) do
|
|
with {:account_status, :active} <- {:account_status, User.account_status(user)},
|
|
{:ok, scopes} <- validate_scopes(app, requested_scopes),
|
|
{:ok, auth} <- Authorization.create_authorization(app, user, scopes) do
|
|
{:ok, auth}
|
|
end
|
|
end
|
|
|
|
# Note: intended to be a private function but opened for AccountController that logs in on signup
|
|
@doc "If checks pass, creates authorization and token for given user, app and requested scopes."
|
|
def login(%User{} = user, %App{} = app, requested_scopes) when is_list(requested_scopes) do
|
|
with {:ok, auth} <- do_create_authorization(user, app, requested_scopes),
|
|
{:mfa_required, _, _, false} <- {:mfa_required, user, auth, MFA.require?(user)},
|
|
{:ok, token} <- Token.exchange_token(app, auth) do
|
|
{:ok, token}
|
|
end
|
|
end
|
|
|
|
# Special case: Local MastodonFE
|
|
defp redirect_uri(%Plug.Conn{} = conn, "."), do: auth_url(conn, :login)
|
|
|
|
defp redirect_uri(%Plug.Conn{}, redirect_uri), do: redirect_uri
|
|
|
|
defp get_session_registration_id(%Plug.Conn{} = conn), do: get_session(conn, :registration_id)
|
|
|
|
defp put_session_registration_id(%Plug.Conn{} = conn, registration_id),
|
|
do: put_session(conn, :registration_id, registration_id)
|
|
|
|
defp build_and_response_mfa_token(user, auth) do
|
|
with {:ok, token} <- MFA.Token.create(user, auth) do
|
|
MFAView.render("mfa_response.json", %{token: token, user: user})
|
|
end
|
|
end
|
|
|
|
@spec validate_scopes(App.t(), map() | list()) ::
|
|
{:ok, list()} | {:error, :missing_scopes | :unsupported_scopes}
|
|
defp validate_scopes(%App{} = app, params) when is_map(params) do
|
|
requested_scopes = Scopes.fetch_scopes(params, app.scopes)
|
|
validate_scopes(app, requested_scopes)
|
|
end
|
|
|
|
defp validate_scopes(%App{} = app, requested_scopes) when is_list(requested_scopes) do
|
|
Scopes.validate(requested_scopes, app.scopes)
|
|
end
|
|
|
|
def default_redirect_uri(%App{} = app) do
|
|
app.redirect_uris
|
|
|> String.split()
|
|
|> Enum.at(0)
|
|
end
|
|
|
|
defp render_invalid_credentials_error(conn) do
|
|
render_error(conn, :bad_request, "Invalid credentials")
|
|
end
|
|
end
|