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37 lines
896 B
Elixir
37 lines
896 B
Elixir
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defmodule PhilomenaMedia.Filename do
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@moduledoc """
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Utilities for building arbitrary filenames for uploaded files.
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"""
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@type extension :: String.t()
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@doc """
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This function builds a replacement "filename key" based on the supplied file extension.
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Names are generated in the form `year/month/day/uuid.ext`. It is recommended to avoid
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providing user-controlled file-extensions to this function; select them from a list of
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known extensions instead.
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## Example
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iex> PhilomenaMedia.Filename.build("png")
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"2024/1/1/0bce8eea-17e0-11ef-b7d4-0242ac120006.png"
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"""
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@spec build(extension()) :: String.t()
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def build(extension) do
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[
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time_identifier(DateTime.utc_now()),
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"/",
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UUID.uuid1(),
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".",
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extension
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]
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|> Enum.join()
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end
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defp time_identifier(time) do
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Enum.join([time.year, time.month, time.day], "/")
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end
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end
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