监护人的问题 - 如何在登录时生成访问和刷新令牌

Question

要使 JWT 无效，人们使用以下两种方法之一

blacklist/whitelist（guardian_db）。
一个刷新令牌（允许重新生成访问令牌）和一个短期到期的访问令牌。

我不想在我的项目中使用 guardian_db。那么，我如何在登录端点生成访问令牌和刷新令牌？

我的代码是：

文件mix.ex

    # Authentication library
    {:guardian, "~> 1.0"}

文件config.exs

    # Guardian configuration
    config :my_proj, MyProj.Guardian,
        issuer: "my_proj",
        verify_module: Guardian.JWT,
        secret_key: "Xxxxxxxxxxxxxxxxxxxxxxxxxx",
        allowed_drift: 2000,
        verify_issuer: true,
        ttl: {5, :minutes}

    # Ueberauth configuration
    config :ueberauth, Ueberauth,
        base_path: "/api/auth",
        providers: [
        identity: {
            Ueberauth.Strategy.Identity,
            [
                callback_methods: ["POST"],
                callback_path: "/api/auth/login",
                nickname_field: :email,
                param_nesting: "account",
                uid_field: :email
            ]
            }
        ]

文件aut_access_pipeline.ex

    defmodule MyProjWeb.Plug.AuthAccessPipeline do
        use Guardian.Plug.Pipeline, otp_app: :my_proj

        plug(Guardian.Plug.VerifySession, claims: %{"typ" => "access"})
        plug(Guardian.Plug.VerifyHeader, claims: %{"typ" => "access"})
        plug(Guardian.Plug.EnsureAuthenticated)
        plug(Guardian.Plug.LoadResource, ensure: true)
        plug(MyProjWeb.Plug.CurrentUser)
        plug(MyProjWeb.Plug.CheckToken)
    end

文件auth_controller.ex

    defmodule MyProjWeb.AuthenticationController do
        def login(conn, %{"email" => email, "password" => password}) do
            case Accounts.get_user_by_email_and_password(email, password) do
                {:ok, user} ->
                    handle_login_response(conn, user, "login.json")

                {:error, _reason} ->
                    conn
                    |> put_status(:unauthorized)
                    |> Error.render(:invalid_credentials)
                    |> halt
            end
        end

        def refresh(conn, %{"jwt" => existing_jwt}) do
            case MyProj.Guardian.refresh(existing_jwt, ttl: {5, :minutes}) do
                {:ok, {_old_token, _old_claims}, {new_jwt, _new_claims}} ->
                    current_user = current_resource(conn)
                    user = MyProj.Accounts.get_user!(current_user.id)

                    conn
                    |> put_resp_header("authorization", "Bearer #{new_jwt}")
                    |> render(MyProjWeb.AuthenticationView, json_file, %{jwt: new_jwt, user: user})
                {:error, _reason} ->
                    conn
                    |> put_status(:unauthorized)
                    |> Error.render(:invalid_credentials)
            end
        end

        defp handle_login_response(conn, user, json_file) do
            new_conn = MyProj.Guardian.Plug.sign_in(conn, user, [])
            jwt = MyProj.Guardian.Plug.current_token(new_conn)
            %{"exp" => exp} = MyProj.Guardian.Plug.current_claims(new_conn)

            new_conn
            |> put_resp_header("authorization", "Bearer #{jwt}")
            |> put_resp_header("x-expires", "#{exp}")
            |> render(MyProjWeb.AuthenticationView, json_file, %{jwt: jwt, user: user})
        end
    end
end

文件guardian.ex

    defmodule MyProj.Guardian do
        use Guardian, otp_app: :my_proj

        def subject_for_token(user = %User{}, _claims),
            do: {:ok, "User:#{user.id}"}

        def subject_for_token(_user, _claims) do
            {:error, :no_resource_id}
        end

        def resource_from_claims(%{"sub" => "User:" <> id}) do
            {:ok, MyProj.Accounts.get_user!(id)}
        end

        def resource_from_claims(_claims) do
            {:error, :no_claims_sub}
        end
    end

使用此代码，我有一个有效的访问令牌，但我不知道如何为 regenerate/refresh 访问令牌过期时生成刷新令牌...

有人可以帮忙吗？

Answer 1

我使用的是旧版本的 Guardian，所以我的代码有点不同，但如果你想在同一个端点中执行它，你可以在正文中匹配一个 grant_type 参数

def login(conn, %{"grant_type" => "password"} = params) do
 case User.find_and_confirm_password(params) do
  {:ok, user} ->
    new_conn = GP.api_sign_in(conn, user, :token, perms: User.permissions(user))
    jwt = GP.current_token(new_conn)
    {:ok, claims} = GP.claims(new_conn)
    exp = Map.get(claims, "exp") -
      (DateTime.utc_now() |> DateTime.to_unix())

    new_conn
    |> put_resp_header("authorization", "Bearer #{jwt}")
    |> put_resp_header("x-expires", "Bearer #{exp}")
    |> render(SessionView, "login.json", jwt: jwt, exp: exp)
  {:error, changeset} ->
    conn
    |> put_status(401)
    |> render(IIMWeb.ChangesetView, "error.json", changeset: changeset)
end

结束

def login(conn, %{"grant_type" => "refresh_token"} = params) do
  jwt = GP.current_token(conn)
  with {:ok, claims} <- GP.claims(conn),
    logged_user_id when not is_nil(logged_user_id) <-
      GP.current_resource(conn)[:id],
    user <- Repo.get!(User, logged_user_id),
    {:ok, new_jwt, new_claims} <- Guardian.refresh!(jwt, claims,
      perms: User.permissions(user))
  do
    exp = Map.get(new_claims, "exp") - (DateTime.utc_now() |> DateTime.to_unix())
    conn
    |> put_resp_header("authorization", "Bearer #{new_jwt}")
    |> put_resp_header("x-expires", "Bearer #{exp}")
    |> render(SessionView, "login.json", jwt: new_jwt, exp: exp)
  else
    {:error, reason} ->
      changeset = %Login{}
      |> Login.changeset(params)
      |> Changeset.add_error(:refresh_token, to_string(reason))
      conn
      |> put_status(401)
      |> render(IIMWeb.ChangesetView, "error.json", changeset: changeset)
end

结束

如您所见，我使用的是相同的端点，但取决于 grant_type 它会收到密码或旧令牌（此请求必须在旧令牌过期前几秒钟完成）由于前端的时区，我将未来时间戳的 exp 时间更改为以毫秒为单位的时间，但您可以随意使用它。

Answer 2

我的解决方案是这样的...

在登录端点中，我用 2 个令牌（访问和刷新）响应...

new_conn =
  MyProj.Guardian.Plug.sign_in(
    conn,
    credentials,
    %{},
    token_type: "refresh"
  )

jwt_refresh = MyProj.Guardian.Plug.current_token(new_conn)

{:ok, _old_stuff, {jwt, %{"exp" => exp} = _new_claims}} =
  MyProj.Guardian.exchange(jwt_refresh, "refresh", "access")

基本上解决方案是使用 MyProj.Guardian.exchange(...)

在刷新端点中，我使用新的访问令牌进行响应...

def refresh(conn, %{"jwt_refresh" => jwt_refresh}) do
case MyProj.Guardian.exchange(jwt_refresh, "refresh", "access") do
  {:ok, _old_stuff, {jwt, %{"exp" => exp} = _new_claims}} ->
    conn
    |> put_resp_header("authorization", "Bearer #{jwt}")
    |> put_resp_header("x-expires", "#{exp}")
    |> render(MyProjWeb.AuthenticationView, "refresh.json", %{jwt: jwt})

  {:error, _reason} ->
    conn
    |> put_status(:unauthorized)
    |> Error.render(:invalid_credentials)
end
end

监护人的问题 - 如何在登录时生成访问和刷新令牌

Problems with guardian - how generate access and refresh token in login

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