forked from AkkomaGang/akkoma
112 lines
2.9 KiB
Elixir
112 lines
2.9 KiB
Elixir
# Pleroma: A lightweight social networking server
|
|
# Copyright © 2017-2018 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.
|
|
"""
|
|
@default "application/octet-stream"
|
|
@read_bytes 35
|
|
|
|
@spec file_mime_type(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),
|
|
filename <- fix_extension(filename, content_type) do
|
|
{:ok, content_type, filename}
|
|
end
|
|
end
|
|
|
|
@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, @read_bytes))
|
|
end)
|
|
end
|
|
|
|
def bin_mime_type(binary, filename) do
|
|
with {:ok, content_type} <- bin_mime_type(binary),
|
|
filename <- fix_extension(filename, content_type) do
|
|
{:ok, content_type, filename}
|
|
end
|
|
end
|
|
|
|
@spec bin_mime_type(binary()) :: {:ok, String.t()} | :error
|
|
def bin_mime_type(<<head::binary-size(@read_bytes), _::binary>>) do
|
|
{:ok, check_mime_type(head)}
|
|
end
|
|
|
|
def bin_mime_type(_), do: :error
|
|
|
|
def mime_type(<<_::binary>>), do: {:ok, @default}
|
|
|
|
defp fix_extension(filename, content_type) do
|
|
parts = String.split(filename, ".")
|
|
|
|
new_filename =
|
|
if length(parts) > 1 do
|
|
Enum.drop(parts, -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 ->
|
|
Enum.join([new_filename, String.split(content_type, "/") |> List.last()], ".")
|
|
end
|
|
end
|
|
|
|
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(<<0x52, 0x49, 0x46, 0x46, _::binary>>) do
|
|
"audio/wav"
|
|
end
|
|
|
|
defp check_mime_type(_) do
|
|
@default
|
|
end
|
|
end
|