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charon
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Authentication & sessions for API's.
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lib/charon/internal.ex
defmodule Charon.Internal do
@moduledoc false
# module consists of shared functions internal to the package
# it CAN be relied on by child packages, so be careful when changing things
use __MODULE__.Constants
require Logger
@url_enc_opts padding: false
@doc """
Get a `now` unix timestamp
"""
def now(), do: System.os_time(:second)
@doc """
Get a value from the conn/resolution's private map
"""
def get_private(_res = %{private: priv}, key), do: Map.get(priv, key)
@doc """
Merge a map into the conn/resolution's private map
"""
def put_private(conn_or_res = %{private: priv}, map),
do: %{conn_or_res | private: Map.merge(priv, map)}
@doc """
Put a key/value into the conn/resolution's private map
"""
def put_private(conn_or_res = %{private: priv}, key, value),
do: %{conn_or_res | private: Map.put(priv, key, value)}
@doc """
Generate a random URL-encoded string of `byte_size` bits.
"""
def random_url_encoded(byte_size) do
byte_size |> :crypto.strong_rand_bytes() |> url_encode()
end
@doc """
Determine if the token's signature transport mechanism is `:cookie` or `:bearer`.
"""
def parse_sig_transport(token_signature_transport)
def parse_sig_transport("bearer"), do: :bearer
def parse_sig_transport("cookie"), do: :cookie
def parse_sig_transport(:bearer), do: :bearer
def parse_sig_transport(:cookie), do: :cookie
@doc """
Split the signature from a "header.payload.signature" token.
"""
def split_signature(token, ttl, cookie_opts) do
[header, payload, signature] = String.split(token, ".", parts: 3)
token = [header, ?., payload, ?.] |> IO.iodata_to_binary()
cookie_opts = Keyword.put(cookie_opts, :max_age, ttl)
{token, signature, cookie_opts}
end
def url_encode(data), do: Base.url_encode64(data, @url_enc_opts)
def url_decode(data), do: Base.url_decode64(data, @url_enc_opts)
def url_decode!(data), do: Base.url_decode64!(data, @url_enc_opts)
end