53 lines
1.4 KiB
Elixir
53 lines
1.4 KiB
Elixir
defmodule Bones73kWeb.EnsureRolePlug do
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@moduledoc """
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This plug ensures that a user has a particular role before accessing a given route.
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## Example
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Let's suppose we have three roles: :admin, :manager and :user.
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If you want a user to have at least manager role, so admins and managers are authorised to access a given route
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plug Bones73kWeb.EnsureRolePlug, [:admin, :manager]
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If you want to give access only to an admin:
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plug Bones73kWeb.EnsureRolePlug, :admin
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"""
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import Plug.Conn
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alias Bones73k.Accounts
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alias Bones73k.Accounts.User
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alias Phoenix.Controller
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alias Plug.Conn
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@doc false
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@spec init(any()) :: any()
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def init(config), do: config
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@doc false
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@spec call(Conn.t(), atom() | [atom()]) :: Conn.t()
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def call(conn, roles) do
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user_token = get_session(conn, :user_token)
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(user_token &&
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Accounts.get_user_by_session_token(user_token))
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|> has_role?(roles)
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|> maybe_halt(conn)
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end
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defp has_role?(%User{} = user, roles) when is_list(roles),
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do: Enum.any?(roles, &has_role?(user, &1))
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defp has_role?(%User{role: role}, role), do: true
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defp has_role?(_user, _role), do: false
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defp maybe_halt(true, conn), do: conn
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defp maybe_halt(_any, conn) do
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conn
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|> Controller.put_flash(:error, "Unauthorised")
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|> Controller.redirect(to: signed_in_path(conn))
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|> halt()
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end
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defp signed_in_path(_conn), do: "/"
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end
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