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Spawn is the core lib for Spawn Actors System
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lib/actors/security/acl/default_acl_manager.ex
defmodule Actors.Security.Acl.DefaultAclManager do
@doc """
`DefaultAclManager`
"""
alias Actors.Security.Acl.Policy
alias Actors.Security.Acl.Rules.AclEvaluator
import Spawn.Utils.Common, only: [to_existing_atom_or_new: 1]
@behaviour Actors.Security.Acl
@impl true
def load_acl_policies(base_policies_path) do
case Agent.start_link(fn -> %{} end, name: __MODULE__) do
{:ok, _pid} ->
Agent.get_and_update(__MODULE__, fn policies ->
update_policies(base_policies_path, policies)
end)
{:error, {:already_started, _pid}} ->
Agent.get(__MODULE__, fn policies -> policies end)
end
end
@impl true
def get_policies!(), do: Agent.get(__MODULE__, fn policies -> policies end)
@impl true
def is_authorized?(policies, invocation) do
Enum.any?(policies, fn policy -> evaluate(policy, invocation) end)
end
defp evaluate(policy, invocation), do: AclEvaluator.eval(policy, invocation)
defp update_policies(path, policies) do
if policies == %{} do
policies = load_policies(path)
{policies, policies}
else
{policies, policies}
end
end
defp load_policies(base_policies_path) do
policies =
Path.wildcard("#{base_policies_path}/*.policy")
|> Enum.map(fn file -> {file, from_file_to_map(file)} end)
|> Enum.map(fn {file, data} ->
%Policy{
name: get_file_name(file),
type: Map.get(data, :type, :allow),
actors: Map.get(data, :actors, ["*"]),
actions: Map.get(data, :actions, ["*"]),
actor_systems: Map.get(data, :actor_systems, ["*"])
}
end)
if length(policies) > 0, do: policies, else: [get_default_policy()]
end
defp get_default_policy() do
%Policy{
name: "default",
type: :allow,
actors: ["*"],
actions: ["*"],
actor_systems: ["*"]
}
end
defp get_file_name(file) do
Path.basename(file)
|> String.replace(".policy", "")
|> String.trim()
end
defp from_file_to_map(path) do
if File.exists?(path) do
File.stream!(path)
|> Stream.map(fn line ->
[key | value] = String.split(line, ":")
key = to_existing_atom_or_new(key)
value =
case key do
:type ->
List.first(value)
|> String.replace("\n", "")
|> String.replace("\"", "")
|> String.trim()
|> String.downcase()
|> to_existing_atom_or_new()
_ ->
value
|> Enum.map(fn elem ->
String.replace(elem, "\n", "")
|> String.trim()
end)
end
{key, value}
end)
|> Enum.into(%{})
else
%{}
end
end
end