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utility package for loading, validating and documenting your app's configuration variables from env, json, jsonc and toml files at runtime and injecting them into your environment
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lib/utils.ex
defmodule Enux.Utils do
@moduledoc false
@doc """
transforms a map into a keyword list
"""
def map_to_keyword_list(map, opts) when is_map(map) do
map
|> Enum.map(fn {k, v} ->
k =
if is_binary(k) do
k |> handle_number() |> handle_whitespace() |> String.to_atom()
else
k
end
case {k, v} do
{k, v} when is_map(v) and not is_struct(v) ->
{k, v |> map_to_keyword_list(opts)}
{k, v} ->
{k, v |> url_encode_conditional(opts)}
end
end)
|> Keyword.new()
end
@doc """
raises an error if a key contains whitespace
"""
def handle_whitespace(key) when is_binary(key) do
case ["\t", "\s"] |> Enum.any?(fn s -> String.contains?(key, s) end) do
true -> raise "#{key} contains whitespace"
false -> key
end
end
@doc """
raises an error if a key starts with a digit
"""
def handle_number(key) when is_binary(key) do
case key |> String.first() |> Integer.parse() do
{_, ""} -> raise "#{key} starts with a digit"
:error -> key
end
end
@doc """
if url_encoded: true is passed as an option to `Enux.load`, this function will url encode the binary values
"""
def url_encode_conditional(value, opts)
when is_binary(value) and is_list(opts) do
case opts |> Keyword.get(:url_encoded, false) do
true -> value |> URI.encode()
false -> value
end
end
def url_encode_conditional(value, _opts) do
value
end
end