akkoma/lib/pleroma/helpers/media_helper.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.Helpers.MediaHelper do
@moduledoc """
Handles common media-related operations.
"""
def image_resize(url, %{max_width: max_width, max_height: max_height} = options) do
quality = options[:quality] || 85
cmd = ~s"""
convert - -resize '#{max_width}x#{max_height}>' -quality #{quality} -
"""
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pid = Port.open({:spawn, cmd}, [:use_stdio, :stream, :exit_status, :binary])
{:ok, env} = url |> Pleroma.Web.MediaProxy.url() |> Pleroma.HTTP.get()
image = env.body
Port.command(pid, image)
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loop_recv(pid)
end
defp loop_recv(pid) do
loop_recv(pid, <<>>)
end
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defp loop_recv(pid, acc) do
receive do
{^pid, {:data, data}} ->
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loop_recv(pid, acc <> data)
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{^pid, {:exit_status, 0}} ->
{:ok, acc}
{^pid, {:exit_status, status}} ->
{:error, status}
end
end
end