Mix tasks: Add frontend task to download and install frontends.

Co-authored-by: Roman Chvanikov <chvanikoff@pm.me>

diff --git a/lib/mix/tasks/pleroma/frontend.ex b/lib/mix/tasks/pleroma/frontend.ex
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+++ b/lib/mix/tasks/pleroma/frontend.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 Mix.Tasks.Pleroma.Frontend do
+  use Mix.Task
+
+  import Mix.Pleroma
+
+  @shortdoc "Manages bundled Pleroma frontends"
+
+  # @moduledoc File.read!("docs/administration/CLI_tasks/frontend.md")
+
+  def run(["install", "none" | _args]) do
+    shell_info("Skipping frontend installation because none was requested")
+    "none"
+  end
+
+  def run(["install", frontend | args]) do
+    log_level = Logger.level()
+    Logger.configure(level: :warn)
+    start_pleroma()
+
+    {options, [], []} =
+      OptionParser.parse(
+        args,
+        strict: [
+          ref: :string,
+          static_dir: :string,
+          build_url: :string
+        ]
+      )
+
+    instance_static_dir =
+      with nil <- options[:static_dir] do
+        Pleroma.Config.get!([:instance, :static_dir])
+      end
+
+    cmd_frontend_info = %{
+      "name" => frontend,
+      "ref" => options[:ref],
+      "build_url" => options[:build_url]
+    }
+
+    config_frontend_info = Pleroma.Config.get([:frontends, :available, frontend], %{})
+
+    frontend_info =
+      Map.merge(config_frontend_info, cmd_frontend_info, fn _key, config, cmd ->
+        # This only overrides things that are actually set
+        cmd || config
+      end)
+
+    ref = frontend_info["ref"]
+
+    unless ref do
+      raise "No ref given or configured"
+    end
+
+    dest =
+      Path.join([
+        instance_static_dir,
+        "frontends",
+        frontend,
+        ref
+      ])
+
+    fe_label = "#{frontend} (#{ref})"
+
+    shell_info("Downloading pre-built bundle for #{fe_label}")
+    tmp_dir = Path.join(dest, "tmp")
+
+    with {_, :ok} <- {:download, download_build(frontend_info, tmp_dir)},
+         shell_info("Installing #{fe_label} to #{dest}"),
+         :ok <- install_frontend(frontend_info, tmp_dir, dest) do
+      File.rm_rf!(tmp_dir)
+      shell_info("Frontend #{fe_label} installed to #{dest}")
+
+      Logger.configure(level: log_level)
+    else
+      {:download, _} ->
+        shell_info("Could not download the frontend")
+
+      _e ->
+        shell_info("Could not install the frontend")
+    end
+  end
+
+  defp download_build(frontend_info, dest) do
+    url = String.replace(frontend_info["build_url"], "${ref}", frontend_info["ref"])
+
+    with {:ok, %{status: 200, body: zip_body}} <-
+           Pleroma.HTTP.get(url, [], timeout: 120_000, recv_timeout: 120_000),
+         {:ok, unzipped} <- :zip.unzip(zip_body, [:memory]) do
+      File.rm_rf!(dest)
+      File.mkdir_p!(dest)
+
+      Enum.each(unzipped, fn {filename, data} ->
+        path = filename
+
+        new_file_path = Path.join(dest, path)
+
+        new_file_path
+        |> Path.dirname()
+        |> File.mkdir_p!()
+
+        File.write!(new_file_path, data)
+      end)
+
+      :ok
+    else
+      e -> {:error, e}
+    end
+  end
+
+  defp install_frontend(frontend_info, source, dest) do
+    from = frontend_info["build_dir"] || "dist"
+    File.mkdir_p!(dest)
+    File.cp_r!(Path.join([source, from]), dest)
+    :ok
+  end
+end