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-rw-r--r--lib/pleroma/mime.ex120
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diff --git a/lib/pleroma/mime.ex b/lib/pleroma/mime.ex
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-# 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.
- """
- @default "application/octet-stream"
- @read_bytes 35
-
- @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),
- 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(<<"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