securex

# SecureX
SecureX (An Advancement To ACL) is Role Based Access Control(RBAC) and Access Control List (ACL) to handle User Roles And Permissions.
You can handle all list of permissions attached to a specific object for certain users or give limited or full Access to specific
module.
It has 4 basic modules, `SecureX.Roles`, `SecureX.Res`, `SecureX.Permissions` and `SecureX.UserRoles`.
All Modules have CRUD to maintain your RBAC.
`SecureX` Module has validation for user.
## Installation
If installing from Hex, use the latest version from there:
  ```elixir
  # mix.ex
  def deps do
    [
      {:securex, "~> 0.3.5"}
    ]
  end
  ```
Now You need to add configuration for `securex` in your `config/config.ex`
You need to add Your Repo and User Schema in config.
  ```elixir
  # config/config.exs
  config :securex, repo: MyApp.Repo,
   schema: MyApp.Schema.User
  ```
SecureX comes with built-in support for apps. Just create migrations with `mix secure_x.gen.migrate`.
  ```elixir
  iex> mix secure_x.gen.migrate
  * creating priv/repo/migrations
  * creating priv/repo/migrations/20211112222439_create_table_roles.exs
  * creating priv/repo/migrations/20211112222439_create_table_resources.exs
  * creating priv/repo/migrations/20211112222439_create_table_permissions.exs
  * creating priv/repo/migrations/20211112222439_create_table_user_roles.exs
  ```
The Migrations added to your project.
  ```elixir
  iex> "Do you want to run this migration?"
  iex> mix ecto.migrate
  ```
You are Now Up and Running!!!
## Guide
You can also use SecureX as a Middleware.
Valid inputs for permissions are "POST","GET","PUT" ,"DELETE","read","write","delete","edit" as well.
Permissions have downward flow. i.e if you have defined permissions for a higher operation,
It automatically assigns them permissions for lower operations.
like "edit" grants permissions for all operations. their hierarchy is in this order.
  ```
    "read" < "write" < "delete" < "edit"
    "GET" < "POST" < "DELETE" < "PUT"
    1 < 2 < 3 < 4
  ```
## Middlewares
In RestApi or GraphiQL all you have to do, add a `Plug`.
## Examples
  ```elixir
   #lib/plugs/securex_plug.ex
    defmodule MyApp.Plugs.SecureXPlug do
      @behaviour Plug
      import Plug.Conn
      def init(default), do: default
      def call(conn, _) do
        with ["Bearer " <> token] <- get_req_header(conn, "authorization"),
            {:ok, claims} <- MyApp.Auth.Guardian.decode_and_verify(token),
            {:ok, user} <- MyApp.Auth.Guardian.resource_from_claims(claims),
            {:ok, %Plug.Conn{}} <- check_permissions(conn, user) do
      conn
    else
      {:error, error} ->
        conn
        |> put_resp_content_type("application/json")
        |> send_resp(403, Jason.encode!(%{errors: error}))
        |> Plug.Conn.halt()
      _ ->
        conn
        |> put_resp_content_type("application/json")
        |> send_resp(403, Jason.encode!(%{errors: ["Permission Denied"]}))
        |> Plug.Conn.halt()
    end
  end
  defp check_permissions(%{body_params: %{"resource" => res, "permission" => permission}} = conn, %{id: user_id}) do
    case SecureX.has_access?(user_id, res, permission) do
        false -> {:error, false}
        true -> {:ok, conn}
      end
  end
  defp check_permissions(_, _), do: {:error, ["Invalid Request"]}
  end
  ```
You are all set. 
Please let us know about and open issue on https://github.com/DevWasi/secruex/issues
Looking Forward to it. 
Happy Coding !!!!!