mirror of
https://framagit.org/framasoft/mobilizon.git
synced 2024-12-22 16:03:25 +00:00
121 lines
3.3 KiB
Elixir
121 lines
3.3 KiB
Elixir
# 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
|
|
|
|
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
|
|
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 ->
|
|
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
|