BitPermission

Bitwise permission operate

Features

• Eeay — Define you list-type permissions, convert to integer-type permissions, operate them using BitPermission!
• Performance — Use erlang bitwise calculate.
• Pure — All function are pure function.

Installation

Add it to your deps list in mix.exs:

defp deps do
  [
    {:bit_permission, github: "qwas368/BitPermission"}
  ]
end

Fetch mix dependencies by running:

$ mix deps.get

Examples

Build your list-type permission

# full permission (list-type)
full_permission_list = [:create, :read, :update, :delete]

Change list-type permission to integer-type permission like:

# full permission (integer-type)
full_permission = full_permission_list |> BitPermission.to_integer

# read permission (integer-type)
read_permission = [:read] |> BitPermission.to_integer(full_permission_list)

Create a user data with permission and use it

# create user data
user = %{name: "John", permission: read_permission}

# can?
if user[:permission] |> BitPermission.can?(full_permission) do
  # can
else
  # can't
end

Help me

Since English is not my native language, feel free to pull your request to correct my spelling or grammar error. Thank you a lot.