mobilizon/lib/web/upload/mime.ex

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# Portions of this file are derived from Pleroma:
# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
# Upstream: https://git.pleroma.social/pleroma/pleroma/blob/develop/lib/pleroma/mime.ex
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defmodule Mobilizon.Web.Upload.MIME do
@moduledoc """
Returns the mime-type of a binary and optionally a normalized file-name.
"""
@default "application/octet-stream"
@read_bytes 35
@spec file_mime_type(String.t(), String.t()) ::
{:ok, content_type :: String.t(), filename :: String.t()}
| {:error, :unknown_mime | :failed_to_fix_extension}
@spec file_mime_type(String.t()) :: {:ok, String.t()} | {:error, :unknown_mime}
def file_mime_type(path, filename) do
case file_mime_type(path) do
{:ok, content_type} ->
case fix_extension(filename, content_type) do
{:error, :failed_to_fix_extension} ->
{:error, :failed_to_fix_extension}
filename when is_binary(filename) ->
{:ok, content_type, filename}
end
{:error, :unknown_mime} ->
{:error, :unknown_mime}
end
end
def file_mime_type(filename) do
File.open(filename, [:read], fn f ->
check_mime_type(IO.binread(f, @read_bytes))
end)
end
defp fix_extension(filename, content_type)
when is_binary(filename) and is_binary(content_type) do
parts = String.split(filename, ".")
new_filename =
if length(parts) > 1 do
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parts |> Enum.drop(-1) |> Enum.join(".")
else
Enum.join(parts)
end
cond do
content_type == "application/octet-stream" ->
filename
ext = List.first(MIME.extensions(content_type)) ->
new_filename <> "." <> ext
true ->
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extension = content_type |> String.split("/") |> List.last()
Enum.join([new_filename, extension], ".")
end
end
defp fix_extension(_, _), do: {:error, :failed_to_fix_extension}
@spec check_mime_type(binary) :: String.t()
defp check_mime_type(<<0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A, _::binary>>) do
"image/png"
end
defp check_mime_type(<<0x47, 0x49, 0x46, 0x38, _, 0x61, _::binary>>) do
"image/gif"
end
defp check_mime_type(<<0xFF, 0xD8, 0xFF, _::binary>>) do
"image/jpeg"
end
defp check_mime_type(<<0x1A, 0x45, 0xDF, 0xA3, _::binary>>) do
"video/webm"
end
defp check_mime_type(<<0x00, 0x00, 0x00, _, 0x66, 0x74, 0x79, 0x70, _::binary>>) do
"video/mp4"
end
defp check_mime_type(<<0x49, 0x44, 0x33, _::binary>>) do
"audio/mpeg"
end
defp check_mime_type(<<255, 251, _, 68, 0, 0, 0, 0, _::binary>>) do
"audio/mpeg"
end
defp check_mime_type(
<<0x4F, 0x67, 0x67, 0x53, 0x00, 0x02, 0x00, 0x00, _::size(160), 0x80, 0x74, 0x68, 0x65,
0x6F, 0x72, 0x61, _::binary>>
) do
"video/ogg"
end
defp check_mime_type(<<0x4F, 0x67, 0x67, 0x53, 0x00, 0x02, 0x00, 0x00, _::binary>>) do
"audio/ogg"
end
defp check_mime_type(<<"RIFF", _::binary-size(4), "WAVE", _::binary>>) do
"audio/wav"
end
defp check_mime_type(<<"RIFF", _::binary-size(4), "WEBP", _::binary>>) do
"image/webp"
end
defp check_mime_type(<<"RIFF", _::binary-size(4), "AVI.", _::binary>>) do
"video/avi"
end
defp check_mime_type(_) do
@default
end
end