Merge branch 'ffmpeg-imagemagick-dependencies-documentation' into 'develop'

`ffmpeg` / `ImageMagick` handling as optional dependencies

See merge request pleroma/pleroma!3031

17 files changed, 235 insertions, 33 deletions

diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index dc953a929..121e4abfe 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -59,7 +59,7 @@ unit-testing:
     alias: postgres
     command: ["postgres", "-c", "fsync=off", "-c", "synchronous_commit=off", "-c", "full_page_writes=off"]
   script:
-    - apt-get update && apt-get install -y libimage-exiftool-perl
+    - apt-get update && apt-get install -y libimage-exiftool-perl ffmpeg
     - mix deps.get
     - mix ecto.create
     - mix ecto.migrate
@@ -93,7 +93,7 @@ unit-testing-rum:
     <<: *global_variables
     RUM_ENABLED: "true"
   script:
-    - apt-get update && apt-get install -y libimage-exiftool-perl
+    - apt-get update && apt-get install -y libimage-exiftool-perl ffmpeg
     - mix deps.get
     - mix ecto.create
     - mix ecto.migrate
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0d3daa60e..e02e84301 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -18,9 +18,10 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 - The `discoverable` field in the `User` struct will now add a NOINDEX metatag to profile pages when false.
 - Users with the `discoverable` field set to false will not show up in searches.
 - Minimum lifetime for ephmeral activities changed to 10 minutes and made configurable (`:min_lifetime` option).
+- Introduced optional dependencies on `ffmpeg`, `ImageMagick`, `exiftool` software packages. Please refer to `docs/installation/optional/media_graphics_packages.md`.
 
 ### Added
-- Media preview proxy (requires media proxy be enabled; see `:media_preview_proxy` config for more details).
+- Media preview proxy (requires `ffmpeg` and `ImageMagick` to be installed and media proxy to be enabled; see `:media_preview_proxy` config for more details).
 - Pleroma API: Importing the mutes users from CSV files.
 - Experimental websocket-based federation between Pleroma instances.
 - Admin API: Importing emoji from a zip file
diff --git a/docs/installation/alpine_linux_en.md b/docs/installation/alpine_linux_en.md
index a5683f18c..d89c7f46f 100644
--- a/docs/installation/alpine_linux_en.md
+++ b/docs/installation/alpine_linux_en.md
@@ -20,6 +20,9 @@ It assumes that you have administrative rights, either as root or a user with [s
 
 * `nginx` (preferred, example configs for other reverse proxies can be found in the repo)
 * `certbot` (or any other ACME client for Let’s Encrypt certificates)
+* `ImageMagick`
+* `ffmpeg`
+* `exiftool`
 
 ### Prepare the system
 
@@ -29,7 +32,6 @@ It assumes that you have administrative rights, either as root or a user with [s
 awk 'NR==2' /etc/apk/repositories | sed 's/main/community/' | tee -a /etc/apk/repositories
 ```
 
-
 * Then update the system, if not already done:
 
 ```shell
@@ -56,6 +58,7 @@ sudo apk add erlang erlang-runtime-tools erlang-xmerl elixir
 ```shell
 sudo apk add erlang-eldap
 ```
+
 ### Install PostgreSQL
 
 * Install Postgresql server:
@@ -76,6 +79,12 @@ sudo /etc/init.d/postgresql start
 sudo rc-update add postgresql
 ```
 
+### Install media / graphics packages (optional, see [`docs/installation/optional/media_graphics_packages.md`](docs/installation/optional/media_graphics_packages.md))
+
+```shell
+sudo apk add ffmpeg imagemagick exiftool
+```
+
 ### Install PleromaBE
 
 * Add a new system user for the Pleroma service:
diff --git a/docs/installation/arch_linux_en.md b/docs/installation/arch_linux_en.md
index 7fb69dd60..724b4660a 100644
--- a/docs/installation/arch_linux_en.md
+++ b/docs/installation/arch_linux_en.md
@@ -15,6 +15,9 @@ This guide will assume that you have administrative rights, either as root or a
 
 * `nginx` (preferred, example configs for other reverse proxies can be found in the repo)
 * `certbot` (or any other ACME client for Let’s Encrypt certificates)
+* `ImageMagick`
+* `ffmpeg`
+* `exiftool`
 
 ### Prepare the system
 
@@ -52,6 +55,12 @@ sudo -iu postgres initdb -D /var/lib/postgres/data
 sudo systemctl enable --now postgresql.service
 ```
 
+### Install media / graphics packages (optional, see [`docs/installation/optional/media_graphics_packages.md`](docs/installation/optional/media_graphics_packages.md))
+
+```shell
+sudo pacman -S ffmpeg imagemagick perl-image-exiftool
+```
+
 ### Install PleromaBE
 
 * Add a new system user for the Pleroma service:
diff --git a/docs/installation/debian_based_en.md b/docs/installation/debian_based_en.md
index 60c2f47e5..eac499a29 100644
--- a/docs/installation/debian_based_en.md
+++ b/docs/installation/debian_based_en.md
@@ -18,6 +18,9 @@ This guide will assume you are on Debian Stretch. This guide should also work wi
 
 * `nginx` (preferred, example configs for other reverse proxies can be found in the repo)
 * `certbot` (or any other ACME client for Let’s Encrypt certificates)
+* `ImageMagick`
+* `ffmpeg`
+* `exiftool`
 
 ### Prepare the system
 
@@ -50,6 +53,12 @@ sudo apt update
 sudo apt install elixir erlang-dev erlang-nox
 ```
 
+### Optional packages: [`docs/installation/optional/media_graphics_packages.md`](docs/installation/optional/media_graphics_packages.md)
+
+```shell
+sudo apt install imagemagick ffmpeg libimage-exiftool-perl
+```
+
 ### Install PleromaBE
 
 * Add a new system user for the Pleroma service:
diff --git a/docs/installation/debian_based_jp.md b/docs/installation/debian_based_jp.md
index c2dd840d3..764afbe1a 100644
--- a/docs/installation/debian_based_jp.md
+++ b/docs/installation/debian_based_jp.md
@@ -22,6 +22,9 @@
 
 - `nginx` (おすすめです。他のリバースプロキシを使う場合は、参考となる設定をこのリポジトリから探してください)
 - `certbot` (または何らかのLet's Encrypt向けACMEクライアント)
+- `ImageMagick`
+- `ffmpeg`
+- `exiftool`
 
 ### システムを準備する
 
@@ -33,10 +36,9 @@ sudo apt full-upgrade
 
 * 上記に挙げたパッケージをインストールしておきます。
 ```
-sudo apt install git build-essential postgresql postgresql-contrib cmake
+sudo apt install git build-essential postgresql postgresql-contrib cmake ffmpeg imagemagick
 ```
 
-
 ### ElixirとErlangをインストールします
 
 * Erlangのリポジトリをダウンロードおよびインストールします。
@@ -51,6 +53,12 @@ sudo apt update
 sudo apt install elixir erlang-dev erlang-nox
 ```
 
+### オプションパッケージ: [`docs/installation/optional/media_graphics_packages.md`](docs/installation/optional/media_graphics_packages.md)
+
+```shell
+sudo apt install imagemagick ffmpeg libimage-exiftool-perl
+```
+
 ### Pleroma BE (バックエンド) をインストールします
 
 *  Pleroma用に新しいユーザーを作ります。
diff --git a/docs/installation/freebsd_en.md b/docs/installation/freebsd_en.md
index ca2575d9b..fdcb06c53 100644
--- a/docs/installation/freebsd_en.md
+++ b/docs/installation/freebsd_en.md
@@ -26,6 +26,12 @@ Setup the required services to automatically start at boot, using `sysrc(8)`.
 # service postgresql start
 ```
 
+### Install media / graphics packages (optional, see [`docs/installation/optional/media_graphics_packages.md`](docs/installation/optional/media_graphics_packages.md))
+
+```shell
+# pkg install imagemagick ffmpeg p5-Image-ExifTool
+```
+
 ## Configuring Pleroma
 
 Create a user for Pleroma:
diff --git a/docs/installation/gentoo_en.md b/docs/installation/gentoo_en.md
index 5a676380c..638fc4e47 100644
--- a/docs/installation/gentoo_en.md
+++ b/docs/installation/gentoo_en.md
@@ -35,6 +35,9 @@ Gentoo quite pointedly does not come with a cron daemon installed, and as such i
 * `www-servers/nginx` (preferred, example configs for other reverse proxies can be found in the repo)
 * `app-crypt/certbot` (or any other ACME client for Let’s Encrypt certificates)
 * `app-crypt/certbot-nginx` (nginx certbot plugin that allows use of the all-powerful `--nginx` flag on certbot)
+* `media-gfx/imagemagick`
+* `media-video/ffmpeg`
+* `media-libs/exiftool`
 
 ### Prepare the system
 
@@ -87,6 +90,12 @@ If you do not plan to make any modifications to your Pleroma instance, cloning d
 
 Not only does this make it much easier to deploy changes you make, as you can commit and pull from upstream and all that good stuff from the comfort of your local machine then simply `git pull` on your instance server when you're ready to deploy, it also ensures you are compliant with the Affero General Public Licence that Pleroma is licenced under, which stipulates that all network services provided with modified AGPL code must publish their changes on a publicly available internet service and for free. It also makes it much easier to ask for help from and provide help to your fellow Pleroma admins if your public repo always reflects what you are running because it is part of your deployment procedure.
 
+### Install media / graphics packages (optional, see [`docs/installation/optional/media_graphics_packages.md`](docs/installation/optional/media_graphics_packages.md))
+
+```shell
+# emerge --ask media-video/ffmpeg media-gfx/imagemagick media-libs/exiftool
+```
+
 ### Install PleromaBE
 
 * Add a new system user for the Pleroma service and set up default directories:
diff --git a/docs/installation/netbsd_en.md b/docs/installation/netbsd_en.md
index 6ad0de2f6..d5fa04fdf 100644
--- a/docs/installation/netbsd_en.md
+++ b/docs/installation/netbsd_en.md
@@ -10,7 +10,7 @@ Pleroma uses.
 
 The `mksh` shell is needed to run the Elixir `mix` script.
 
-`# pkgin install acmesh elixir git-base git-docs mksh nginx postgresql11-server postgresql11-client postgresql11-contrib sudo`
+`# pkgin install acmesh elixir git-base git-docs mksh nginx postgresql11-server postgresql11-client postgresql11-contrib sudo ffmpeg4 ImageMagick`
 
 You can also build these packages using pkgsrc:
 ```
@@ -44,6 +44,10 @@ pgsql=YES
 
 First, run `# /etc/rc.d/pgsql start`. Then, `$ sudo -Hu pgsql -g pgsql createdb`.
 
+### Install media / graphics packages (optional, see [`docs/installation/optional/media_graphics_packages.md`](docs/installation/optional/media_graphics_packages.md))
+
+`# pkgin install ImageMagick ffmpeg4 p5-Image-ExifTool`
+
 ## Configuring Pleroma
 
 Create a user for Pleroma:
diff --git a/docs/installation/openbsd_en.md b/docs/installation/openbsd_en.md
index eee452845..8092ac379 100644
--- a/docs/installation/openbsd_en.md
+++ b/docs/installation/openbsd_en.md
@@ -10,20 +10,34 @@ The following packages need to be installed:
 
   * elixir
   * gmake
-  * ImageMagick
   * git
   * postgresql-server
   * postgresql-contrib
   * cmake
+  * ffmpeg
+  * ImageMagick
 
 To install them, run the following command (with doas or as root):
 
 ```
-pkg_add elixir gmake ImageMagick git postgresql-server postgresql-contrib cmake
+pkg_add elixir gmake git postgresql-server postgresql-contrib cmake ffmpeg ImageMagick
 ```
 
 Pleroma requires a reverse proxy, OpenBSD has relayd in base (and is used in this guide) and packages/ports are available for nginx (www/nginx) and apache (www/apache-httpd). Independently of the reverse proxy, [acme-client(1)](https://man.openbsd.org/acme-client) can be used to get a certificate from Let's Encrypt.
 
+#### Optional software
+
+Per [`docs/installation/optional/media_graphics_packages.md`](docs/installation/optional/media_graphics_packages.md):
+  * ImageMagick
+  * ffmpeg
+  * exiftool
+
+To install the above:
+
+```
+pkg_add ImageMagick ffmpeg p5-Image-ExifTool
+```
+
 #### Creating the pleroma user
 Pleroma will be run by a dedicated user, \_pleroma. Before creating it, insert the following lines in login.conf:
 ```
diff --git a/docs/installation/openbsd_fi.md b/docs/installation/openbsd_fi.md
index b5b5056a9..01cf34ab4 100644
--- a/docs/installation/openbsd_fi.md
+++ b/docs/installation/openbsd_fi.md
@@ -16,7 +16,18 @@ Matrix-kanava #freenode_#pleroma:matrix.org ovat hyviä paikkoja löytää apua
 
 Asenna tarvittava ohjelmisto:
 
-`# pkg_add git elixir gmake postgresql-server-10.3 postgresql-contrib-10.3 cmake`
+`# pkg_add git elixir gmake postgresql-server-10.3 postgresql-contrib-10.3 cmake ffmpeg ImageMagick`
+
+#### Optional software
+
+[`docs/installation/optional/media_graphics_packages.md`](docs/installation/optional/media_graphics_packages.md):
+  * ImageMagick
+  * ffmpeg
+  * exiftool
+
+Asenna tarvittava ohjelmisto:
+
+`# pkg_add ImageMagick ffmpeg p5-Image-ExifTool`
 
 Luo postgresql-tietokanta:
 
diff --git a/docs/installation/optional/media_graphics_packages.md b/docs/installation/optional/media_graphics_packages.md
new file mode 100644
index 000000000..cb3d71188
--- /dev/null
+++ b/docs/installation/optional/media_graphics_packages.md
@@ -0,0 +1,32 @@
+# Optional software packages needed for specific functionality
+
+For specific Pleroma functionality (which is disabled by default) some or all of the below packages are required:
+  * `ImageMagic`
+  * `ffmpeg`
+  * `exiftool`
+  
+Please refer to documentation in `docs/installation` on how to install them on specific OS.
+  
+Note: the packages are not required with the current default settings of Pleroma.
+
+## `ImageMagick`
+
+`ImageMagick` is a set of tools to create, edit, compose, or convert bitmap images.
+
+It is required for the following Pleroma features:
+  * `Pleroma.Upload.Filters.Mogrify`, `Pleroma.Upload.Filters.Mogrifun` upload filters (related config: `Plaroma.Upload/filters` in `config/config.exs`)
+  * Media preview proxy for still images (related config: `media_preview_proxy/enabled` in `config/config.exs`)
+  
+## `ffmpeg`
+
+`ffmpeg` is software to record, convert and stream audio and video.
+
+It is required for the following Pleroma features:
+  * Media preview proxy for videos (related config: `media_preview_proxy/enabled` in `config/config.exs`)
+
+## `exiftool`
+
+`exiftool` is media files metadata reader/writer.
+
+It is required for the following Pleroma features:
+  * `Pleroma.Upload.Filters.Exiftool` upload filter (related config: `Plaroma.Upload/filters` in `config/config.exs`)
diff --git a/docs/installation/otp_en.md b/docs/installation/otp_en.md
index b7e3bb2ac..f6b05c887 100644
--- a/docs/installation/otp_en.md
+++ b/docs/installation/otp_en.md
@@ -40,6 +40,25 @@ Other than things bundled in the OTP release Pleroma depends on:
     apt install curl unzip libncurses5 postgresql postgresql-contrib nginx certbot
     ```
 
+### Installing optional packages
+
+Per [`docs/installation/optional/media_graphics_packages.md`](docs/installation/optional/media_graphics_packages.md):
+  * ImageMagick
+  * ffmpeg
+  * exiftool
+
+=== "Alpine"
+    ```
+    echo "http://nl.alpinelinux.org/alpine/latest-stable/community" >> /etc/apk/repositories
+    apk update
+    apk add imagemagick ffmpeg exiftool
+    ```
+
+=== "Debian/Ubuntu"
+    ```
+    apt install imagemagick ffmpeg libimage-exiftool-perl
+    ```
+
 ## Setup
 ### Configuring PostgreSQL
 #### (Optional) Installing RUM indexes
diff --git a/lib/pleroma/application.ex b/lib/pleroma/application.ex
index 00ec79a2a..e73d89350 100644
--- a/lib/pleroma/application.ex
+++ b/lib/pleroma/application.ex
@@ -56,7 +56,6 @@ defmodule Pleroma.Application do
     Pleroma.ApplicationRequirements.verify!()
     setup_instrumenters()
     load_custom_modules()
-    check_system_commands()
     Pleroma.Docs.JSON.compile()
 
     adapter = Application.get_env(:tesla, :adapter)
@@ -260,21 +259,4 @@ defmodule Pleroma.Application do
   end
 
   defp http_children(_, _), do: []
-
-  defp check_system_commands do
-    filters = Config.get([Pleroma.Upload, :filters])
-
-    check_filter = fn filter, command_required ->
-      with true <- filter in filters,
-           false <- Pleroma.Utils.command_available?(command_required) do
-        Logger.error(
-          "#{filter} is specified in list of Pleroma.Upload filters, but the #{command_required} command is not found"
-        )
-      end
-    end
-
-    check_filter.(Pleroma.Upload.Filters.Exiftool, "exiftool")
-    check_filter.(Pleroma.Upload.Filters.Mogrify, "mogrify")
-    check_filter.(Pleroma.Upload.Filters.Mogrifun, "mogrify")
-  end
 end
diff --git a/lib/pleroma/application_requirements.ex b/lib/pleroma/application_requirements.ex
index 16f62b6f5..b977257a3 100644
--- a/lib/pleroma/application_requirements.ex
+++ b/lib/pleroma/application_requirements.ex
@@ -9,6 +9,9 @@ defmodule Pleroma.ApplicationRequirements do
 
   defmodule VerifyError, do: defexception([:message])
 
+  alias Pleroma.Config
+  alias Pleroma.Helpers.MediaHelper
+
   import Ecto.Query
 
   require Logger
@@ -16,7 +19,8 @@ defmodule Pleroma.ApplicationRequirements do
   @spec verify!() :: :ok | VerifyError.t()
   def verify! do
     :ok
-    |> check_confirmation_accounts!
+    |> check_system_commands!()
+    |> check_confirmation_accounts!()
     |> check_migrations_applied!()
     |> check_welcome_message_config!()
     |> check_rum!()
@@ -48,7 +52,9 @@ defmodule Pleroma.ApplicationRequirements do
     if Pleroma.Config.get([:instance, :account_activation_required]) &&
          not Pleroma.Config.get([Pleroma.Emails.Mailer, :enabled]) do
       Logger.error(
-        "Account activation enabled, but no Mailer settings enabled.\nPlease set config :pleroma, :instance, account_activation_required: false\nOtherwise setup and enable Mailer."
+        "Account activation enabled, but no Mailer settings enabled.\n" <>
+          "Please set config :pleroma, :instance, account_activation_required: false\n" <>
+          "Otherwise setup and enable Mailer."
       )
 
       {:error,
@@ -81,7 +87,9 @@ defmodule Pleroma.ApplicationRequirements do
               Enum.map(down_migrations, fn {:down, id, name} -> "- #{name} (#{id})\n" end)
 
             Logger.error(
-              "The following migrations were not applied:\n#{down_migrations_text}If you want to start Pleroma anyway, set\nconfig :pleroma, :i_am_aware_this_may_cause_data_loss, disable_migration_check: true"
+              "The following migrations were not applied:\n#{down_migrations_text}" <>
+                "If you want to start Pleroma anyway, set\n" <>
+                "config :pleroma, :i_am_aware_this_may_cause_data_loss, disable_migration_check: true"
             )
 
             {:error, "Unapplied Migrations detected"}
@@ -124,14 +132,22 @@ defmodule Pleroma.ApplicationRequirements do
     case {setting, migrate} do
       {true, false} ->
         Logger.error(
-          "Use `RUM` index is enabled, but were not applied migrations for it.\nIf you want to start Pleroma anyway, set\nconfig :pleroma, :database, rum_enabled: false\nOtherwise apply the following migrations:\n`mix ecto.migrate --migrations-path priv/repo/optional_migrations/rum_indexing/`"
+          "Use `RUM` index is enabled, but were not applied migrations for it.\n" <>
+            "If you want to start Pleroma anyway, set\n" <>
+            "config :pleroma, :database, rum_enabled: false\n" <>
+            "Otherwise apply the following migrations:\n" <>
+            "`mix ecto.migrate --migrations-path priv/repo/optional_migrations/rum_indexing/`"
         )
 
         {:error, "Unapplied RUM Migrations detected"}
 
       {false, true} ->
         Logger.error(
-          "Detected applied migrations to use `RUM` index, but `RUM` isn't enable in settings.\nIf you want to use `RUM`, set\nconfig :pleroma, :database, rum_enabled: true\nOtherwise roll `RUM` migrations back.\n`mix ecto.rollback --migrations-path priv/repo/optional_migrations/rum_indexing/`"
+          "Detected applied migrations to use `RUM` index, but `RUM` isn't enable in settings.\n" <>
+            "If you want to use `RUM`, set\n" <>
+            "config :pleroma, :database, rum_enabled: true\n" <>
+            "Otherwise roll `RUM` migrations back.\n" <>
+            "`mix ecto.rollback --migrations-path priv/repo/optional_migrations/rum_indexing/`"
         )
 
         {:error, "RUM Migrations detected"}
@@ -140,4 +156,50 @@ defmodule Pleroma.ApplicationRequirements do
         :ok
     end
   end
+
+  defp check_system_commands!(:ok) do
+    filter_commands_statuses = [
+      check_filter(Pleroma.Upload.Filters.Exiftool, "exiftool"),
+      check_filter(Pleroma.Upload.Filters.Mogrify, "mogrify"),
+      check_filter(Pleroma.Upload.Filters.Mogrifun, "mogrify")
+    ]
+
+    preview_proxy_commands_status =
+      if !Config.get([:media_preview_proxy, :enabled]) or
+           MediaHelper.missing_dependencies() == [] do
+        true
+      else
+        Logger.error(
+          "The following dependencies required by Media preview proxy " <>
+            "(which is currently enabled) are not installed: " <>
+            inspect(MediaHelper.missing_dependencies())
+        )
+
+        false
+      end
+
+    if Enum.all?([preview_proxy_commands_status | filter_commands_statuses], & &1) do
+      :ok
+    else
+      {:error,
+       "System commands missing. Check logs and see `docs/installation` for more details."}
+    end
+  end
+
+  defp check_system_commands!(result), do: result
+
+  defp check_filter(filter, command_required) do
+    filters = Config.get([Pleroma.Upload, :filters])
+
+    if filter in filters and not Pleroma.Utils.command_available?(command_required) do
+      Logger.error(
+        "#{filter} is specified in list of Pleroma.Upload filters, but the " <>
+          "#{command_required} command is not found"
+      )
+
+      false
+    else
+      true
+    end
+  end
 end
diff --git a/lib/pleroma/helpers/media_helper.ex b/lib/pleroma/helpers/media_helper.ex
index b6f35a24b..6b799173e 100644
--- a/lib/pleroma/helpers/media_helper.ex
+++ b/lib/pleroma/helpers/media_helper.ex
@@ -9,6 +9,18 @@ defmodule Pleroma.Helpers.MediaHelper do
 
   alias Pleroma.HTTP
 
+  require Logger
+
+  def missing_dependencies do
+    Enum.reduce([imagemagick: "convert", ffmpeg: "ffmpeg"], [], fn {sym, executable}, acc ->
+      if Pleroma.Utils.command_available?(executable) do
+        acc
+      else
+        [sym | acc]
+      end
+    end)
+  end
+
   def image_resize(url, options) do
     with executable when is_binary(executable) <- System.find_executable("convert"),
          {:ok, args} <- prepare_image_resize_args(options),
diff --git a/test/web/media_proxy/media_proxy_controller_test.exs b/test/web/media_proxy/media_proxy_controller_test.exs
index 33e6873f7..e9b584822 100644
--- a/test/web/media_proxy/media_proxy_controller_test.exs
+++ b/test/web/media_proxy/media_proxy_controller_test.exs
@@ -81,6 +81,15 @@ defmodule Pleroma.Web.MediaProxy.MediaProxyControllerTest do
   end
 
   describe "Media Preview Proxy" do
+    def assert_dependencies_installed do
+      missing_dependencies = Pleroma.Helpers.MediaHelper.missing_dependencies()
+
+      assert missing_dependencies == [],
+             "Error: missing dependencies (please refer to `docs/installation`): #{
+               inspect(missing_dependencies)
+             }"
+    end
+
     setup do
       clear_config([:media_proxy, :enabled], true)
       clear_config([:media_preview_proxy, :enabled], true)
@@ -184,6 +193,8 @@ defmodule Pleroma.Web.MediaProxy.MediaProxyControllerTest do
       url: url,
       media_proxy_url: media_proxy_url
     } do
+      assert_dependencies_installed()
+
       # Setting a high :min_content_length to ensure this scenario is not affected by its logic
       clear_config([:media_preview_proxy, :min_content_length], 1_000_000_000)
 
@@ -270,6 +281,8 @@ defmodule Pleroma.Web.MediaProxy.MediaProxyControllerTest do
       url: url,
       media_proxy_url: media_proxy_url
     } do
+      assert_dependencies_installed()
+
       Tesla.Mock.mock(fn
         %{method: "head", url: ^media_proxy_url} ->
           %Tesla.Env{status: 200, body: "", headers: [{"content-type", "image/png"}]}
@@ -290,6 +303,8 @@ defmodule Pleroma.Web.MediaProxy.MediaProxyControllerTest do
       url: url,
       media_proxy_url: media_proxy_url
     } do
+      assert_dependencies_installed()
+
       Tesla.Mock.mock(fn
         %{method: "head", url: ^media_proxy_url} ->
           %Tesla.Env{status: 200, body: "", headers: [{"content-type", "image/jpeg"}]}