37 lines
995 B
Elixir
37 lines
995 B
Elixir
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defmodule Mix.Tasks.Phx.Gen.Secret do
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@shortdoc "Generates a secret"
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@moduledoc """
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Generates a secret and prints it to the terminal.
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$ mix phx.gen.secret [length]
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By default, mix phx.gen.secret generates a key 64 characters long.
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The minimum value for `length` is 32.
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"""
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use Mix.Task
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@doc false
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def run([]), do: run(["64"])
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def run([int]), do: int |> parse!() |> random_string() |> Mix.shell().info()
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def run([_|_]), do: invalid_args!()
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defp parse!(int) do
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case Integer.parse(int) do
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{int, ""} -> int
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_ -> invalid_args!()
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end
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end
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defp random_string(length) when length > 31 do
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:crypto.strong_rand_bytes(length) |> Base.encode64(padding: false) |> binary_part(0, length)
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end
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defp random_string(_), do: Mix.raise "The secret should be at least 32 characters long"
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@spec invalid_args!() :: no_return()
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defp invalid_args! do
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Mix.raise "mix phx.gen.secret expects a length as integer or no argument at all"
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end
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end
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