Anon/pleroma
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

MIME: video/audio ogg detection

Browse Source
This commit is contained in:
href 2018-11-30 17:56:28 +01:00
parent 680716b3c9
commit 7282937f33
No known key found for this signature in database
GPG Key ID: EE8296C1A152C325
1 changed files with 20 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

32
lib/pleroma/mime.ex
View File

@ -1,8 +1,9 @@
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 31
@spec file_mime_type(String.t()) ::
{:ok, content_type :: String.t(), filename :: String.t()} | {:error, any()} | :error
@ -16,7 +17,7 @@ defmodule Pleroma.MIME do
@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
@ -28,7 +29,7 @@ defmodule Pleroma.MIME do
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
@ -58,39 +59,46 @@ defmodule Pleroma.MIME do
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(<<0x52, 0x49, 0x46, 0x46, _::binary>>) do
"audio/wav"
end