+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
defmodule Pleroma.MIME do
@moduledoc """
- Returns the mime-type of a binary and optionally a normalized file-name. Requires at least (the first) 8 bytes.
+ 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()) ::
+ @spec file_mime_type(String.t(), String.t()) ::
{:ok, content_type :: String.t(), filename :: String.t()} | {:error, any()} | :error
def file_mime_type(path, filename) do
with {:ok, content_type} <- file_mime_type(path),
@spec file_mime_type(String.t()) :: {:ok, String.t()} | {:error, any()} | :error
def file_mime_type(filename) do
File.open(filename, [:read], fn f ->
- check_mime_type(IO.binread(f, 8))
+ check_mime_type(IO.binread(f, @read_bytes))
end)
end
end
@spec bin_mime_type(binary()) :: {:ok, String.t()} | :error
- def bin_mime_type(<<head::binary-size(8), _::binary>>) do
+ def bin_mime_type(<<head::binary-size(@read_bytes), _::binary>>) do
{:ok, check_mime_type(head)}
end
- def mime_type(<<_::binary>>), do: {:ok, @default}
-
def bin_mime_type(_), do: :error
+ def mime_type(<<_::binary>>), do: {:ok, @default}
+
defp fix_extension(filename, content_type) do
parts = String.split(filename, ".")
end
end
- defp check_mime_type(<<0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A>>) do
+ 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, _, _>>) do
+ defp check_mime_type(<<0x47, 0x49, 0x46, 0x38, _, 0x61, _::binary>>) do
"image/gif"
end
- defp check_mime_type(<<0xFF, 0xD8, 0xFF, _, _, _, _, _>>) do
+ defp check_mime_type(<<0xFF, 0xD8, 0xFF, _::binary>>) do
"image/jpeg"
end
- defp check_mime_type(<<0x1A, 0x45, 0xDF, 0xA3, _, _, _, _>>) do
+ defp check_mime_type(<<0x1A, 0x45, 0xDF, 0xA3, _::binary>>) do
"video/webm"
end
- defp check_mime_type(<<0x00, 0x00, 0x00, _, 0x66, 0x74, 0x79, 0x70>>) do
+ defp check_mime_type(<<0x00, 0x00, 0x00, _, 0x66, 0x74, 0x79, 0x70, _::binary>>) do
"video/mp4"
end
- defp check_mime_type(<<0x49, 0x44, 0x33, _, _, _, _, _>>) do
+ defp check_mime_type(<<0x49, 0x44, 0x33, _::binary>>) do
"audio/mpeg"
end
- defp check_mime_type(<<255, 251, _, 68, 0, 0, 0, 0>>) do
+ 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>>) do
+ 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(<<0x52, 0x49, 0x46, 0x46, _, _, _, _>>) do
+ 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