creating trusted app from adminFE & mix task

lib/mix/tasks/pleroma/app.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.App do
+  @moduledoc File.read!("docs/administration/CLI_tasks/oauth_app.md")
+  use Mix.Task
+
+  import Mix.Pleroma
+
+  @shortdoc "Creates trusted OAuth App"
+
+  def run(["create" | options]) do
+    start_pleroma()
+
+    {opts, _} =
+      OptionParser.parse!(options,
+        strict: [name: :string, redirect_uri: :string, scopes: :string],
+        aliases: [n: :name, r: :redirect_uri, s: :scopes]
+      )
+
+    scopes =
+      if opts[:scopes] do
+        String.split(opts[:scopes], ",")
+      else
+        ["read", "write", "follow", "push"]
+      end
+
+    params = %{
+      client_name: opts[:name],
+      redirect_uris: opts[:redirect_uri],
+      trusted: true,
+      scopes: scopes
+    }
+
+    with {:ok, app} <- Pleroma.Web.OAuth.App.create(params) do
+      shell_info("#{app.client_name} successfully created:")
+      shell_info("App client_id: " <> app.client_id)
+      shell_info("App client_secret: " <> app.client_secret)
+    else
+      {:error, changeset} ->
+        shell_error("Creating failed:")
+
+        Enum.each(Pleroma.Web.OAuth.App.errors(changeset), fn {key, error} ->
+          shell_error("#{key}: #{error}")
+        end)
+    end
+  end
+end