63 lines
1.8 KiB
Elixir
63 lines
1.8 KiB
Elixir
# Pleroma: A lightweight social networking server
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# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
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# SPDX-License-Identifier: AGPL-3.0-only
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defmodule Pleroma.Helpers.MediaHelper do
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@moduledoc """
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Handles common media-related operations.
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"""
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@ffmpeg_opts [{:sync, true}, {:stdout, true}]
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def ffmpeg_resize_remote(uri, max_width, max_height) do
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cmd = ~s"""
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curl -L "#{uri}" |
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ffmpeg -i pipe:0 -vf \
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"scale='min(#{max_width},iw)':min'(#{max_height},ih)':force_original_aspect_ratio=decrease" \
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-f image2 pipe:1 | \
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cat
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"""
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with {:ok, [stdout: stdout_list]} <- Exexec.run(cmd, @ffmpeg_opts) do
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{:ok, Enum.join(stdout_list)}
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end
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end
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@doc "Returns a temporary path for an URI"
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def temporary_path_for(uri) do
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name = Path.basename(uri)
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random = rand_uniform(999_999)
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Path.join(System.tmp_dir(), "#{random}-#{name}")
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end
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@doc "Stores binary content fetched from specified URL as a temporary file."
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@spec store_as_temporary_file(String.t(), binary()) :: {:ok, String.t()} | {:error, atom()}
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def store_as_temporary_file(url, body) do
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path = temporary_path_for(url)
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with :ok <- File.write(path, body), do: {:ok, path}
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end
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@doc "Modifies image file at specified path by resizing to specified limit dimensions."
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@spec mogrify_resize_to_limit(String.t(), String.t()) :: :ok | any()
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def mogrify_resize_to_limit(path, resize_dimensions) do
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with %Mogrify.Image{} <-
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path
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|> Mogrify.open()
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|> Mogrify.resize_to_limit(resize_dimensions)
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|> Mogrify.save(in_place: true) do
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:ok
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end
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end
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defp rand_uniform(high) do
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Code.ensure_loaded(:rand)
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if function_exported?(:rand, :uniform, 1) do
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:rand.uniform(high)
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else
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# Erlang/OTP < 19
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apply(:crypto, :rand_uniform, [1, high])
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end
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end
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end
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