[feature/frogend] (Mastodon) domain block CSV import (#1390)

* checkbox-list styling with taller <p> element

* CSV import/export, UI/UX improvements to import-export interface

* minor styling tweaks

* csv export, clean up export type branching

* abstract domain block entry validation

* foundation for PSL check + suggestions

* Squashed commit of the following:

commit e3655ba4fbea1d55738b2f9e407d3378af26afe6
Author: f0x <f0x@cthu.lu>
Date:   Tue Jan 31 15:19:10 2023 +0100

    let debug depend on env (prod/debug) again

commit 79c792b832a2b59e472dcdff646bad6d71b42cc9
Author: f0x <f0x@cthu.lu>
Date:   Tue Jan 31 00:34:01 2023 +0100

    update checklist components

commit 4367960fe4be4e3978077af06e63a729d64e32fb
Author: f0x <f0x@cthu.lu>
Date:   Mon Jan 30 23:46:20 2023 +0100

    checklist performance improvements

commit 204a4c02d16ffad189a6e8a6001d5bf4ff95fc4e
Author: f0x <f0x@cthu.lu>
Date:   Mon Jan 30 20:05:34 2023 +0100

    checklist field: use reducer for state

* remove debug logging

* show and use domain block suggestion

* restructure import/export buttons

* updating suggestions

* suggestion overview

* restructure check-list behavior, domain import/export

1 files changed, 123 insertions, 0 deletions

diff --git a/web/source/settings/admin/federation/import-export/form.jsx b/web/source/settings/admin/federation/import-export/form.jsx
new file mode 100644
index 000000000..afd2d775d
--- /dev/null
+++ b/web/source/settings/admin/federation/import-export/form.jsx
@@ -0,0 +1,123 @@
+/*
+	GoToSocial
+	Copyright (C) 2021-2023 GoToSocial Authors admin@gotosocial.org
+
+	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/>.
+*/
+
+"use strict";
+
+const React = require("react");
+
+const query = require("../../../lib/query");
+const useFormSubmit = require("../../../lib/form/submit");
+
+const {
+	TextArea,
+	Select,
+} = require("../../../components/form/inputs");
+
+const MutationButton = require("../../../components/form/mutation-button");
+
+const { Error } = require("../../../components/error");
+const ExportFormatTable = require("./export-format-table");
+
+module.exports = function ImportExportForm({ form, submitParse, parseResult }) {
+	const [submitExport, exportResult] = useFormSubmit(form, query.useExportDomainListMutation());
+
+	const [updateFromFile, setUpdateFromFile] = React.useState(false);
+
+	function fileChanged(e) {
+		const reader = new FileReader();
+		reader.onload = function (read) {
+			form.domains.setter(read.target.result);
+			setUpdateFromFile(true);
+		};
+		reader.readAsText(e.target.files[0]);
+	}
+
+	React.useEffect(() => {
+		if (exportResult.isSuccess) {
+			form.domains.setter(exportResult.data);
+		}
+		/* eslint-disable-next-line react-hooks/exhaustive-deps */
+	}, [exportResult]);
+
+	if (updateFromFile) {
+		setUpdateFromFile(false);
+		submitParse();
+	}
+	return (
+		<>
+			<h1>Import / Export suspended domains</h1>
+			<p>
+				This page can be used to import and export lists of domains to suspend.
+				Exports can be done in various formats, with varying functionality and support in other software.
+				Imports will automatically detect what format is being processed.
+			</p>
+			<ExportFormatTable />
+			<div className="import-export">
+				<TextArea
+					field={form.domains}
+					label="Domains"
+					placeholder={`google.com\nfacebook.com`}
+					rows={8}
+				/>
+
+				<div className="button-grid">
+					<MutationButton
+						label="Import"
+						type="button"
+						onClick={() => submitParse()}
+						result={parseResult}
+						showError={false}
+					/>
+					<label className="button">
+						Import file
+						<input
+							type="file"
+							className="hidden"
+							onChange={fileChanged}
+							accept="application/json,text/plain,text/csv"
+						/>
+					</label>
+					<b /> {/* grid filler */}
+					<MutationButton
+						label="Export"
+						type="button"
+						onClick={() => submitExport("export")}
+						result={exportResult} showError={false}
+					/>
+					<MutationButton label="Export to file" type="button" onClick={() => submitExport("export-file")} result={exportResult} showError={false} />
+					<div className="export-file">
+						<span>
+							as
+						</span>
+						<Select
+							field={form.exportType}
+							options={<>
+								<option value="plain">Text</option>
+								<option value="json">JSON</option>
+								<option value="csv">CSV</option>
+							</>}
+						/>
+					</div>
+				</div>
+
+				{parseResult.error && <Error error={parseResult.error} />}
+				{exportResult.error && <Error error={exportResult.error} />}
+			</div>
+		</>
+	);
+};
\ No newline at end of file