Replace ImageMagick with Vips for Media Preview Proxy

Dockerfile

@@ -9,7 +9,7 @@ COPY . .
 
 ENV MIX_ENV=prod
 
-RUN apk add git gcc g++ musl-dev make cmake file-dev &&\
+RUN apk add git gcc g++ musl-dev make cmake file-dev vips &&\
 	echo "import Config" > config/prod.secret.exs &&\
 	mix local.hex --force &&\
 	mix local.rebar --force &&\
@@ -37,7 +37,7 @@ ARG HOME=/opt/pleroma
 ARG DATA=/var/lib/pleroma
 
 RUN apk update &&\
-	apk add exiftool ffmpeg imagemagick libmagic ncurses postgresql-client &&\
+	apk add exiftool ffmpeg vips libmagic ncurses postgresql-client &&\
 	adduser --system --shell /bin/false --home ${HOME} pleroma &&\
 	mkdir -p ${DATA}/uploads &&\
 	mkdir -p ${DATA}/static &&\

lib/pleroma/helpers/media_helper.ex

@@ -8,11 +8,12 @@ defmodule Pleroma.Helpers.MediaHelper do
   """
 
   alias Pleroma.HTTP
+  alias Vix.Vips.Operation
 
   require Logger
 
   def missing_dependencies do
-    Enum.reduce([imagemagick: "convert", ffmpeg: "ffmpeg"], [], fn {sym, executable}, acc ->
+    Enum.reduce([ffmpeg: "ffmpeg"], [], fn {sym, executable}, acc ->
       if Pleroma.Utils.command_available?(executable) do
         acc
       else
@@ -22,54 +23,22 @@ defmodule Pleroma.Helpers.MediaHelper do
   end
 
   def image_resize(url, options) do
-    with executable when is_binary(executable) <- System.find_executable("convert"),
-         {:ok, args} <- prepare_image_resize_args(options),
-         {:ok, env} <- HTTP.get(url, [], pool: :media),
-         {:ok, fifo_path} <- mkfifo() do
-      args = List.flatten([fifo_path, args])
-      run_fifo(fifo_path, env, executable, args)
+    with {:ok, env} <- HTTP.get(url, [], pool: :media),
+         {:ok, resized} <-
+           Operation.thumbnail_buffer(env.body, options.max_width,
+             height: options.max_height,
+             size: :VIPS_SIZE_DOWN
+           ) do
+      if options[:format] == "png" do
+        Operation.pngsave_buffer(resized, Q: options[:quality])
+      else
+        Operation.jpegsave_buffer(resized, Q: options[:quality], interlace: true)
+      end
     else
-      nil -> {:error, {:convert, :command_not_found}}
       {:error, _} = error -> error
     end
   end
 
-  defp prepare_image_resize_args(
-         %{max_width: max_width, max_height: max_height, format: "png"} = options
-       ) do
-    quality = options[:quality] || 85
-    resize = Enum.join([max_width, "x", max_height, ">"])
-
-    args = [
-      "-resize",
-      resize,
-      "-quality",
-      to_string(quality),
-      "png:-"
-    ]
-
-    {:ok, args}
-  end
-
-  defp prepare_image_resize_args(%{max_width: max_width, max_height: max_height} = options) do
-    quality = options[:quality] || 85
-    resize = Enum.join([max_width, "x", max_height, ">"])
-
-    args = [
-      "-interlace",
-      "Plane",
-      "-resize",
-      resize,
-      "-quality",
-      to_string(quality),
-      "jpg:-"
-    ]
-
-    {:ok, args}
-  end
-
-  defp prepare_image_resize_args(_), do: {:error, :missing_options}
-
   # Note: video thumbnail is intentionally not resized (always has original dimensions)
   def video_framegrab(url) do
     with executable when is_binary(executable) <- System.find_executable("ffmpeg"),

mix.exs

@@ -193,6 +193,7 @@ defmodule Pleroma.Mixfile do
       {:eblurhash, "~> 1.2.2"},
       {:open_api_spex, "~> 3.16"},
       {:ecto_psql_extras, "~> 0.6"},
+      {:vix, "~> 0.14.0"},
 
       ## dev & test
       {:ex_doc, "~> 0.22", only: :dev, runtime: false},

mix.lock

@@ -132,6 +132,7 @@
   "ueberauth": {:hex, :ueberauth, "0.10.5", "806adb703df87e55b5615cf365e809f84c20c68aa8c08ff8a416a5a6644c4b02", [:mix], [{:plug, "~> 1.5", [hex: :plug, repo: "hexpm", optional: false]}], "hexpm", "3efd1f31d490a125c7ed453b926f7c31d78b97b8a854c755f5c40064bf3ac9e1"},
   "unicode_util_compat": {:hex, :unicode_util_compat, "0.7.0", "bc84380c9ab48177092f43ac89e4dfa2c6d62b40b8bd132b1059ecc7232f9a78", [:rebar3], [], "hexpm", "25eee6d67df61960cf6a794239566599b09e17e668d3700247bc498638152521"},
   "unsafe": {:hex, :unsafe, "1.0.1", "a27e1874f72ee49312e0a9ec2e0b27924214a05e3ddac90e91727bc76f8613d8", [:mix], [], "hexpm", "6c7729a2d214806450d29766abc2afaa7a2cbecf415be64f36a6691afebb50e5"},
+  "vix": {:hex, :vix, "0.14.0", "f84eaf28191514d385829580db4e1c971e75ecfa771538a40159c18d88340049", [:make, :mix], [{:elixir_make, "~> 0.6", [hex: :elixir_make, repo: "hexpm", optional: false]}, {:kino, "~> 0.7", [hex: :kino, repo: "hexpm", optional: true]}], "hexpm", "964003b93351b51d0a5b80d80b3d568da4546e6ecbb1ee0bd0fb0a5c8d6e8cc9"},
   "web_push_encryption": {:hex, :web_push_encryption, "0.3.1", "76d0e7375142dfee67391e7690e89f92578889cbcf2879377900b5620ee4708d", [:mix], [{:httpoison, "~> 1.0", [hex: :httpoison, repo: "hexpm", optional: false]}, {:jose, "~> 1.11.1", [hex: :jose, repo: "hexpm", optional: false]}], "hexpm", "4f82b2e57622fb9337559058e8797cb0df7e7c9790793bdc4e40bc895f70e2a2"},
   "websock": {:hex, :websock, "0.5.3", "2f69a6ebe810328555b6fe5c831a851f485e303a7c8ce6c5f675abeb20ebdadc", [:mix], [], "hexpm", "6105453d7fac22c712ad66fab1d45abdf049868f253cf719b625151460b8b453"},
   "websock_adapter": {:hex, :websock_adapter, "0.5.5", "9dfeee8269b27e958a65b3e235b7e447769f66b5b5925385f5a569269164a210", [:mix], [{:bandit, ">= 0.6.0", [hex: :bandit, repo: "hexpm", optional: true]}, {:plug, "~> 1.14", [hex: :plug, repo: "hexpm", optional: false]}, {:plug_cowboy, "~> 2.6", [hex: :plug_cowboy, repo: "hexpm", optional: true]}, {:websock, "~> 0.5", [hex: :websock, repo: "hexpm", optional: false]}], "hexpm", "4b977ba4a01918acbf77045ff88de7f6972c2a009213c515a445c48f224ffce9"},