[feature] Allow import/export/creation of domain allows via admin panel (#2264)

* it's happening!

* aaa

* fix silly whoopsie

* it's working pa! it's working ma!

* model report parameters

* shuffle some more stuff around

* getting there

* oo hoo

* finish tidying up for now

* aaa

* fix use form submit errors

* peepee poo poo

* aaaaa

* ffff

* they see me typin', they hatin'

* boop

* aaa

* oooo

* typing typing tappa tappa

* almost done typing

* weee

* alright

* push it push it real good doo doo doo doo doo doo

* thingy no worky

* almost done

* mutation modifers not quite right

* hmm

* it works

* view blocks + allows nicely

* it works!

* typia install

* the old linterino

* linter plz

web/source/settings/lib/form/file.tsx

@@ -0,0 +1,112 @@
+/*
+	GoToSocial
+	Copyright (C) GoToSocial Authors admin@gotosocial.org
+	SPDX-License-Identifier: AGPL-3.0-or-later
+
+	This program is free software: you can redistribute it and/or modify
+	it under the terms of the GNU Affero General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	This program is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU Affero General Public License for more details.
+
+	You should have received a copy of the GNU Affero General Public License
+	along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+import React from "react";
+
+import { useState } from "react";
+import prettierBytes from "prettier-bytes";
+
+import type {
+	CreateHookNames,
+	HookOpts,
+	FileFormInputHook,
+} from "./types";
+
+const _default = undefined;
+export default function useFileInput(
+	{ name }: CreateHookNames,
+	{
+		withPreview,
+		maxSize,
+		initialInfo = "no file selected"
+	}: HookOpts<File>
+): FileFormInputHook {
+	const [file, setFile] = useState<File>();
+	const [imageURL, setImageURL] = useState<string>();
+	const [info, setInfo] = useState<React.JSX.Element>();
+
+	function onChange(e: React.ChangeEvent<HTMLInputElement>) {
+		const files = e.target.files;
+		if (!files) {
+			setInfo(undefined);
+			return;
+		}
+
+		let file = files[0];
+		setFile(file);
+
+		if (imageURL) {
+			URL.revokeObjectURL(imageURL);
+		}
+		
+		if (withPreview) {
+			setImageURL(URL.createObjectURL(file));
+		}
+
+		let size = prettierBytes(file.size);
+		if (maxSize && file.size > maxSize) {
+			size = <span className="error-text">{size}</span>;
+		}
+
+		setInfo(
+			<>
+				{file.name} ({size})
+			</>
+		);
+	}
+
+	function reset() {
+		if (imageURL) {
+			URL.revokeObjectURL(imageURL);
+		}
+		setImageURL(undefined);
+		setFile(undefined);
+		setInfo(undefined);
+	}
+
+	const infoComponent = (
+		<span className="form-info">
+			{info
+				? info
+				: initialInfo
+			}
+		</span>
+	);
+
+	// Array / Object hybrid, for easier access in different contexts
+	return Object.assign([
+		onChange,
+		reset,
+		{
+			[name]: file,
+			[`${name}URL`]: imageURL,
+			[`${name}Info`]: infoComponent,
+		}
+	], {
+		onChange,
+		reset,
+		name,
+		Name: "", // Will be set by inputHook function.
+		value: file,
+		previewValue: imageURL,
+		hasChanged: () => file != undefined,
+		infoComponent,
+		_default,
+	});
+}