[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

13 files changed, 1054 insertions, 484 deletions

diff --git a/web/source/settings/admin/emoji/remote/parse-from-toot.js b/web/source/settings/admin/emoji/remote/parse-from-toot.js
index 309619ea4..84bbbdc92 100644
--- a/web/source/settings/admin/emoji/remote/parse-from-toot.js
+++ b/web/source/settings/admin/emoji/remote/parse-from-toot.js
@@ -129,14 +129,16 @@ function CopyEmojiForm({ localEmojiCodes, type, emojiList }) {
 			title: "No emoji selected, cannot perform any actions"
 		};
 
+	const checkListExtraProps = React.useCallback(() => ({ localEmojiCodes }), [localEmojiCodes]);
+
 	return (
 		<div className="parsed">
 			<span>This {type == "statuses" ? "toot" : "account"} uses the following custom emoji, select the ones you want to copy/disable:</span>
 			<form onSubmit={formSubmit}>
 				<CheckList
 					field={form.selectedEmoji}
-					Component={EmojiEntry}
-					localEmojiCodes={localEmojiCodes}
+					EntryComponent={EmojiEntry}
+					getExtraProps={checkListExtraProps}
 				/>
 
 				<CategorySelect
@@ -170,7 +172,7 @@ function ErrorList({ errors }) {
 	);
 }
 
-function EmojiEntry({ entry: emoji, localEmojiCodes, onChange }) {
+function EmojiEntry({ entry: emoji, onChange, extraProps: { localEmojiCodes } }) {
 	const shortcodeField = useTextInput("shortcode", {
 		defaultValue: emoji.shortcode,
 		validator: function validateShortcode(code) {
@@ -181,9 +183,16 @@ function EmojiEntry({ entry: emoji, localEmojiCodes, onChange }) {
 	});
 
 	React.useEffect(() => {
-		onChange({ valid: shortcodeField.valid });
-		/* eslint-disable-next-line react-hooks/exhaustive-deps */
-	}, [shortcodeField.valid]);
+		if (emoji.valid != shortcodeField.valid) {
+			onChange({ valid: shortcodeField.valid });
+		}
+	}, [onChange, emoji.valid, shortcodeField.valid]);
+
+	React.useEffect(() => {
+		shortcodeField.validate();
+		// only need this update if it's the emoji.checked that updated, not shortcodeField
+		// eslint-disable-next-line react-hooks/exhaustive-deps
+	}, [emoji.checked]);
 
 	return (
 		<>
diff --git a/web/source/settings/admin/federation/import-export.js b/web/source/settings/admin/federation/import-export.js
deleted file mode 100644
index a11174b1f..000000000
--- a/web/source/settings/admin/federation/import-export.js
+++ /dev/null
@@ -1,307 +0,0 @@
-/*
-	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 { Switch, Route, Redirect, useLocation } = require("wouter");
-
-const query = require("../../lib/query");
-
-const {
-	useTextInput,
-	useBoolInput,
-	useRadioInput,
-	useCheckListInput
-} = require("../../lib/form");
-
-const useFormSubmit = require("../../lib/form/submit");
-
-const {
-	TextInput,
-	TextArea,
-	Checkbox,
-	Select,
-	RadioGroup
-} = require("../../components/form/inputs");
-
-const CheckList = require("../../components/check-list");
-const MutationButton = require("../../components/form/mutation-button");
-const isValidDomain = require("is-valid-domain");
-const FormWithData = require("../../lib/form/form-with-data");
-const { Error } = require("../../components/error");
-
-const baseUrl = "/settings/admin/federation/import-export";
-
-module.exports = function ImportExport() {
-	const [updateFromFile, setUpdateFromFile] = React.useState(false);
-	const form = {
-		domains: useTextInput("domains"),
-		exportType: useTextInput("exportType", { defaultValue: "plain", dontReset: true })
-	};
-
-	const [submitParse, parseResult] = useFormSubmit(form, query.useProcessDomainListMutation());
-	const [submitExport, exportResult] = useFormSubmit(form, query.useExportDomainListMutation());
-
-	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]);
-
-	const [_location, setLocation] = useLocation();
-
-	if (updateFromFile) {
-		setUpdateFromFile(false);
-		submitParse();
-	}
-
-	return (
-		<Switch>
-			<Route path={`${baseUrl}/list`}>
-				{!parseResult.isSuccess && <Redirect to={baseUrl} />}
-
-				<h1>
-					<span className="button" onClick={() => {
-						parseResult.reset();
-						setLocation(baseUrl);
-					}}>
-						&lt; back
-					</span> Confirm import:
-				</h1>
-				<FormWithData
-					dataQuery={query.useInstanceBlocksQuery}
-					DataForm={ImportList}
-					list={parseResult.data}
-				/>
-			</Route>
-
-			<Route>
-				{parseResult.isSuccess && <Redirect to={`${baseUrl}/list`} />}
-				<h2>Import / Export suspended domains</h2>
-
-				<div>
-					<form onSubmit={submitParse}>
-						<TextArea
-							field={form.domains}
-							label="Domains, one per line (plaintext) or JSON"
-							placeholder={`google.com\nfacebook.com`}
-							rows={8}
-						/>
-
-						<div className="row">
-							<MutationButton label="Import" result={parseResult} showError={false} />
-							<button type="button" className="with-padding">
-								<label>
-									Import file
-									<input className="hidden" type="file" onChange={fileChanged} accept="application/json,text/plain" />
-								</label>
-							</button>
-						</div>
-					</form>
-					<form onSubmit={submitExport}>
-						<div className="row">
-							<MutationButton name="export" label="Export" result={exportResult} showError={false} />
-							<MutationButton name="export-file" label="Export file" result={exportResult} showError={false} />
-							<Select
-								field={form.exportType}
-								options={<>
-									<option value="plain">Text</option>
-									<option value="json">JSON</option>
-								</>}
-							/>
-						</div>
-					</form>
-					{parseResult.error && <Error error={parseResult.error} />}
-					{exportResult.error && <Error error={exportResult.error} />}
-				</div>
-			</Route>
-		</Switch>
-	);
-};
-
-function ImportList({ list, data: blockedInstances }) {
-	const hasComment = React.useMemo(() => {
-		let hasPublic = false;
-		let hasPrivate = false;
-
-		list.some((entry) => {
-			if (entry.public_comment?.length > 0) {
-				hasPublic = true;
-			}
-
-			if (entry.private_comment?.length > 0) {
-				hasPrivate = true;
-			}
-
-			return hasPublic && hasPrivate;
-		});
-
-		if (hasPublic && hasPrivate) {
-			return { both: true };
-		} else if (hasPublic) {
-			return { type: "public_comment" };
-		} else if (hasPrivate) {
-			return { type: "private_comment" };
-		} else {
-			return {};
-		}
-	}, [list]);
-
-	const showComment = useTextInput("showComment", { defaultValue: hasComment.type ?? "public_comment" });
-	let commentName = "";
-	if (showComment.value == "public_comment") { commentName = "Public comment"; }
-	if (showComment.value == "private_comment") { commentName = "Private comment"; }
-
-	const form = {
-		domains: useCheckListInput("domains", {
-			entries: list,
-			uniqueKey: "domain"
-		}),
-		obfuscate: useBoolInput("obfuscate"),
-		privateComment: useTextInput("private_comment", {
-			defaultValue: `Imported on ${new Date().toLocaleString()}`
-		}),
-		privateCommentBehavior: useRadioInput("private_comment_behavior", {
-			defaultValue: "append",
-			options: {
-				append: "Append to",
-				replace: "Replace"
-			}
-		}),
-		publicComment: useTextInput("public_comment"),
-		publicCommentBehavior: useRadioInput("public_comment_behavior", {
-			defaultValue: "append",
-			options: {
-				append: "Append to",
-				replace: "Replace"
-			}
-		}),
-	};
-
-	const [importDomains, importResult] = useFormSubmit(form, query.useImportDomainListMutation(), { changedOnly: false });
-
-	return (
-		<>
-			<form onSubmit={importDomains} className="suspend-import-list">
-				<span>{list.length} domain{list.length != 1 ? "s" : ""} in this list</span>
-
-				{hasComment.both &&
-					<Select field={showComment} options={
-						<>
-							<option value="public_comment">Show public comments</option>
-							<option value="private_comment">Show private comments</option>
-						</>
-					} />
-				}
-
-				<CheckList
-					field={form.domains}
-					Component={DomainEntry}
-					header={
-						<>
-							<b>Domain</b>
-							<b></b>
-							<b>{commentName}</b>
-						</>
-					}
-					blockedInstances={blockedInstances}
-					commentType={showComment.value}
-				/>
-
-				<TextArea
-					field={form.privateComment}
-					label="Private comment"
-					rows={3}
-				/>
-				<RadioGroup
-					field={form.privateCommentBehavior}
-					label="imported private comment"
-				/>
-
-				<TextArea
-					field={form.publicComment}
-					label="Public comment"
-					rows={3}
-				/>
-				<RadioGroup
-					field={form.publicCommentBehavior}
-					label="imported public comment"
-				/>
-
-				<Checkbox
-					field={form.obfuscate}
-					label="Obfuscate domains in public lists"
-				/>
-
-				<MutationButton label="Import" result={importResult} />
-			</form>
-		</>
-	);
-}
-
-function DomainEntry({ entry, onChange, blockedInstances, commentType }) {
-	const domainField = useTextInput("domain", {
-		defaultValue: entry.domain,
-		validator: (value) => {
-			return (entry.checked && !isValidDomain(value, { wildcard: true, allowUnicode: true }))
-				? "Invalid domain"
-				: "";
-		}
-	});
-
-	React.useEffect(() => {
-		onChange({ valid: domainField.valid });
-		/* eslint-disable-next-line react-hooks/exhaustive-deps */
-	}, [domainField.valid]);
-
-	let icon = null;
-
-	if (blockedInstances[domainField.value] != undefined) {
-		icon = (
-			<>
-				<i className="fa fa-history already-blocked" aria-hidden="true" title="Domain block already exists"></i>
-				<span className="sr-only">Domain block already exists.</span>
-			</>
-		);
-	}
-
-	return (
-		<>
-			<TextInput
-				field={domainField}
-				onChange={(e) => {
-					domainField.onChange(e);
-					onChange({ domain: e.target.value, checked: true });
-				}}
-			/>
-			<span id="icon">{icon}</span>
-			<p>{entry[commentType]}</p>
-		</>
-	);
-}
\ No newline at end of file
diff --git a/web/source/settings/admin/federation/import-export/export-format-table.jsx b/web/source/settings/admin/federation/import-export/export-format-table.jsx
new file mode 100644
index 000000000..72b2db04f
--- /dev/null
+++ b/web/source/settings/admin/federation/import-export/export-format-table.jsx
@@ -0,0 +1,64 @@
+/*
+	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");
+
+module.exports = function ExportFormatTable() {
+	return (
+		<table className="export-format-table">
+			<thead>
+				<tr>
+					<th rowSpan={2} />
+					<th colSpan={2}>Includes</th>
+					<th colSpan={2}>Importable by</th>
+				</tr>
+				<tr>
+					<th>Domain</th>
+					<th>Public comment</th>
+					<th>GoToSocial</th>
+					<th>Mastodon</th>
+				</tr>
+			</thead>
+			<tbody>
+				<Format name="Text" info={[true, false, true, false]} />
+				<Format name="JSON" info={[true, true, true, false]} />
+				<Format name="CSV" info={[true, true, true, true]} />
+			</tbody>
+		</table>
+	);
+};
+
+function Format({ name, info }) {
+	return (
+		<tr>
+			<td><b>{name}</b></td>
+			{info.map((b, key) => <td key={key} className="bool">{bool(b)}</td>)}
+		</tr>
+	);
+}
+
+function bool(val) {
+	return (
+		<>
+			<i className={`fa fa-${val ? "check" : "times"}`} aria-hidden="true"></i>
+			<span className="sr-only">{val ? "Yes" : "No"}</span>
+		</>
+	);
+}
\ No newline at end of file
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
diff --git a/web/source/settings/admin/federation/import-export/index.jsx b/web/source/settings/admin/federation/import-export/index.jsx
new file mode 100644
index 000000000..3039b98f3
--- /dev/null
+++ b/web/source/settings/admin/federation/import-export/index.jsx
@@ -0,0 +1,78 @@
+/*
+	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 { Switch, Route, Redirect, useLocation } = require("wouter");
+
+const query = require("../../../lib/query");
+
+const {
+	useTextInput,
+} = require("../../../lib/form");
+
+const useFormSubmit = require("../../../lib/form/submit");
+
+const ProcessImport = require("./process");
+const ImportExportForm = require("./form");
+
+const baseUrl = "/settings/admin/federation/import-export";
+
+module.exports = function ImportExport() {
+	const form = {
+		domains: useTextInput("domains"),
+		exportType: useTextInput("exportType", { defaultValue: "plain", dontReset: true })
+	};
+
+	const [submitParse, parseResult] = useFormSubmit(form, query.useProcessDomainListMutation());
+
+	const [_location, setLocation] = useLocation();
+
+	return (
+		<Switch>
+			<Route path={`${baseUrl}/process`}>
+				{parseResult.isSuccess ? (
+					<>
+						<h1>
+							<span className="button" onClick={() => {
+								parseResult.reset();
+								setLocation(baseUrl);
+							}}>
+								&lt; back
+							</span> Confirm import:
+						</h1>
+						<ProcessImport
+							list={parseResult.data}
+						/>
+					</>
+				) : <Redirect to={baseUrl} />}
+			</Route>
+
+			<Route>
+				{!parseResult.isSuccess ? (
+					<ImportExportForm
+						form={form}
+						submitParse={submitParse}
+						parseResult={parseResult}
+					/>
+				) : <Redirect to={`${baseUrl}/process`} />}
+			</Route>
+		</Switch>
+	);
+};
\ No newline at end of file
diff --git a/web/source/settings/admin/federation/import-export/process.jsx b/web/source/settings/admin/federation/import-export/process.jsx
new file mode 100644
index 000000000..0b2d10099
--- /dev/null
+++ b/web/source/settings/admin/federation/import-export/process.jsx
@@ -0,0 +1,327 @@
+/*
+	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 { isValidDomainBlock, hasBetterScope } = require("../../../lib/domain-block");
+
+const {
+	useTextInput,
+	useBoolInput,
+	useRadioInput,
+	useCheckListInput
+} = require("../../../lib/form");
+
+const useFormSubmit = require("../../../lib/form/submit");
+
+const {
+	TextInput,
+	TextArea,
+	Checkbox,
+	Select,
+	RadioGroup
+} = require("../../../components/form/inputs");
+
+const CheckList = require("../../../components/check-list");
+const MutationButton = require("../../../components/form/mutation-button");
+const FormWithData = require("../../../lib/form/form-with-data");
+
+module.exports = React.memo(
+	function ProcessImport({ list }) {
+		return (
+			<div className="without-border">
+				<FormWithData
+					dataQuery={query.useInstanceBlocksQuery}
+					DataForm={ImportList}
+					list={list}
+				/>
+			</div>
+		);
+	}
+);
+
+function ImportList({ list, data: blockedInstances }) {
+	const hasComment = React.useMemo(() => {
+		let hasPublic = false;
+		let hasPrivate = false;
+
+		list.some((entry) => {
+			if (entry.public_comment?.length > 0) {
+				hasPublic = true;
+			}
+
+			if (entry.private_comment?.length > 0) {
+				hasPrivate = true;
+			}
+
+			return hasPublic && hasPrivate;
+		});
+
+		if (hasPublic && hasPrivate) {
+			return { both: true };
+		} else if (hasPublic) {
+			return { type: "public_comment" };
+		} else if (hasPrivate) {
+			return { type: "private_comment" };
+		} else {
+			return {};
+		}
+	}, [list]);
+
+	const showComment = useTextInput("showComment", { defaultValue: hasComment.type ?? "public_comment" });
+
+	const form = {
+		domains: useCheckListInput("domains", { entries: list }),
+		obfuscate: useBoolInput("obfuscate"),
+		privateComment: useTextInput("private_comment", {
+			defaultValue: `Imported on ${new Date().toLocaleString()}`
+		}),
+		privateCommentBehavior: useRadioInput("private_comment_behavior", {
+			defaultValue: "append",
+			options: {
+				append: "Append to",
+				replace: "Replace"
+			}
+		}),
+		publicComment: useTextInput("public_comment"),
+		publicCommentBehavior: useRadioInput("public_comment_behavior", {
+			defaultValue: "append",
+			options: {
+				append: "Append to",
+				replace: "Replace"
+			}
+		}),
+	};
+
+	const [importDomains, importResult] = useFormSubmit(form, query.useImportDomainListMutation(), { changedOnly: false });
+
+	return (
+		<>
+			<form onSubmit={importDomains} className="suspend-import-list">
+				<span>{list.length} domain{list.length != 1 ? "s" : ""} in this list</span>
+
+				{hasComment.both &&
+					<Select field={showComment} options={
+						<>
+							<option value="public_comment">Show public comments</option>
+							<option value="private_comment">Show private comments</option>
+						</>
+					} />
+				}
+
+				<DomainCheckList
+					field={form.domains}
+					blockedInstances={blockedInstances}
+					commentType={showComment.value}
+				/>
+
+				<TextArea
+					field={form.privateComment}
+					label="Private comment"
+					rows={3}
+				/>
+				<RadioGroup
+					field={form.privateCommentBehavior}
+					label="imported private comment"
+				/>
+
+				<TextArea
+					field={form.publicComment}
+					label="Public comment"
+					rows={3}
+				/>
+				<RadioGroup
+					field={form.publicCommentBehavior}
+					label="imported public comment"
+				/>
+
+				<Checkbox
+					field={form.obfuscate}
+					label="Obfuscate domains in public lists"
+				/>
+
+				<MutationButton label="Import" result={importResult} />
+			</form>
+		</>
+	);
+}
+
+function DomainCheckList({ field, blockedInstances, commentType }) {
+	const getExtraProps = React.useCallback((entry) => {
+		return {
+			comment: entry[commentType],
+			alreadyExists: blockedInstances[entry.domain] != undefined
+		};
+	}, [blockedInstances, commentType]);
+
+	const entriesWithSuggestions = React.useMemo(() => (
+		Object.values(field.value).filter((entry) => entry.suggest)
+	), [field.value]);
+
+	return (
+		<>
+			<CheckList
+				field={field}
+				header={<>
+					<b>Domain</b>
+					<b></b>
+					<b>
+						{commentType == "public_comment" && "Public comment"}
+						{commentType == "private_comment" && "Private comment"}
+					</b>
+				</>}
+				EntryComponent={DomainEntry}
+				getExtraProps={getExtraProps}
+			/>
+			<UpdateHint
+				entries={entriesWithSuggestions}
+				updateEntry={field.onChange}
+				updateMultiple={field.updateMultiple}
+			/>
+		</>
+	);
+}
+
+const UpdateHint = React.memo(
+	function UpdateHint({ entries, updateEntry, updateMultiple }) {
+		if (entries.length == 0) {
+			return null;
+		}
+
+		function changeAll() {
+			updateMultiple(
+				entries.map((entry) => [entry.key, { domain: entry.suggest, suggest: null }])
+			);
+		}
+
+		return (
+			<div className="update-hints">
+				<p>
+					{entries.length} {entries.length == 1 ? "entry uses" : "entries use"} a specific subdomain,
+					which you might want to change to the main domain, as that includes all it's (future) subdomains.
+				</p>
+				<div className="hints">
+					{entries.map((entry) => (
+						<UpdateableEntry key={entry.key} entry={entry} updateEntry={updateEntry} />
+					))}
+				</div>
+				{entries.length > 0 && <a onClick={changeAll}>change all</a>}
+			</div>
+		);
+	}
+);
+
+const UpdateableEntry = React.memo(
+	function UpdateableEntry({ entry, updateEntry }) {
+		return (
+			<>
+				<span className="text-cutoff">{entry.domain}</span>
+				<i class="fa fa-long-arrow-right" aria-hidden="true"></i>
+				<span>{entry.suggest}</span>
+				<a role="button" onClick={() =>
+					updateEntry(entry.key, { domain: entry.suggest, suggest: null })
+				}>change</a>
+			</>
+		);
+	}
+);
+
+function domainValidationError(isValid) {
+	return isValid ? "" : "Invalid domain";
+}
+
+function DomainEntry({ entry, onChange, extraProps: { alreadyExists, comment } }) {
+	const domainField = useTextInput("domain", {
+		defaultValue: entry.domain,
+		showValidation: entry.checked,
+		initValidation: domainValidationError(entry.valid),
+		validator: (value) => domainValidationError(isValidDomainBlock(value))
+	});
+
+	React.useEffect(() => {
+		if (entry.valid != domainField.valid) {
+			onChange({ valid: domainField.valid });
+		}
+	}, [onChange, entry.valid, domainField.valid]);
+
+	React.useEffect(() => {
+		if (entry.domain != domainField.value) {
+			domainField.setter(entry.domain);
+		}
+		// domainField.setter is enough, eslint wants domainField
+		// eslint-disable-next-line react-hooks/exhaustive-deps
+	}, [entry.domain, domainField.setter]);
+
+	React.useEffect(() => {
+		onChange({ suggest: hasBetterScope(domainField.value) });
+		// only need this update if it's the entry.checked that updated, not onChange
+		// eslint-disable-next-line react-hooks/exhaustive-deps
+	}, [domainField.value]);
+
+	function clickIcon(e) {
+		if (entry.suggest) {
+			e.stopPropagation();
+			e.preventDefault();
+			domainField.setter(entry.suggest);
+			onChange({ domain: entry.suggest, checked: true });
+		}
+	}
+
+	return (
+		<>
+			<TextInput
+				field={domainField}
+				onChange={(e) => {
+					domainField.onChange(e);
+					onChange({ domain: e.target.value, checked: true });
+				}}
+			/>
+			<span id="icon" onClick={clickIcon}>
+				<DomainEntryIcon alreadyExists={alreadyExists} suggestion={entry.suggest} onChange={onChange} />
+			</span>
+			<p>{comment}</p>
+		</>
+	);
+}
+
+function DomainEntryIcon({ alreadyExists, suggestion }) {
+	let icon;
+	let text;
+
+	if (suggestion) {
+		icon = "fa-info-circle suggest-changes";
+		text = `Entry targets a specific subdomain, consider changing it to '${suggestion}'.`;
+	} else if (alreadyExists) {
+		icon = "fa-history already-blocked";
+		text = "Domain block already exists.";
+	}
+
+	if (!icon) {
+		return null;
+	}
+
+	return (
+		<>
+			<i className={`fa ${icon}`} aria-hidden="true" title={text}></i>
+			<span className="sr-only">{text}</span>
+		</>
+	);
+}
\ No newline at end of file
diff --git a/web/source/settings/components/check-list.jsx b/web/source/settings/components/check-list.jsx
index 1276d5dbf..569cd7470 100644
--- a/web/source/settings/components/check-list.jsx
+++ b/web/source/settings/components/check-list.jsx
@@ -20,39 +20,71 @@
 
 const React = require("react");
 
-module.exports = function CheckList({ field, Component, header = " All", ...componentProps }) {
+module.exports = function CheckList({ field, header = "All", EntryComponent, getExtraProps }) {
 	return (
 		<div className="checkbox-list list">
-			<label className="header">
-				<input
-					ref={field.toggleAll.ref}
-					type="checkbox"
-					onChange={field.toggleAll.onChange}
-					checked={field.toggleAll.value === 1}
-				/> {header}
-			</label>
-			{Object.values(field.value).map((entry) => (
-				<CheckListEntry
-					key={entry.key}
-					onChange={(value) => field.onChange(entry.key, value)}
-					entry={entry}
-					Component={Component}
-					componentProps={componentProps}
-				/>
-			))}
+			<CheckListHeader toggleAll={field.toggleAll}>	{header}</CheckListHeader>
+			<CheckListEntries
+				entries={field.value}
+				updateValue={field.onChange}
+				EntryComponent={EntryComponent}
+				getExtraProps={getExtraProps}
+			/>
 		</div>
 	);
 };
 
-function CheckListEntry({ entry, onChange, Component, componentProps }) {
+function CheckListHeader({ toggleAll, children }) {
 	return (
-		<label className="entry">
+		<label className="header entry">
 			<input
+				ref={toggleAll.ref}
 				type="checkbox"
-				onChange={(e) => onChange({ checked: e.target.checked })}
-				checked={entry.checked}
-			/>
-			<Component entry={entry} onChange={onChange} {...componentProps} />
+				onChange={toggleAll.onChange}
+			/> {children}
 		</label>
 	);
-}
\ No newline at end of file
+}
+
+const CheckListEntries = React.memo(
+	function CheckListEntries({ entries, updateValue, EntryComponent, getExtraProps }) {
+		const deferredEntries = React.useDeferredValue(entries);
+
+		return Object.values(deferredEntries).map((entry) => (
+			<CheckListEntry
+				key={entry.key}
+				entry={entry}
+				updateValue={updateValue}
+				EntryComponent={EntryComponent}
+				getExtraProps={getExtraProps}
+			/>
+		));
+	}
+);
+
+/*
+	React.memo is a performance optimization that only re-renders a CheckListEntry
+	when it's props actually change, instead of every time anything
+	in the list (CheckListEntries) updates
+*/
+const CheckListEntry = React.memo(
+	function CheckListEntry({ entry, updateValue, getExtraProps, EntryComponent }) {
+		const onChange = React.useCallback(
+			(value) => updateValue(entry.key, value),
+			[updateValue, entry.key]
+		);
+
+		const extraProps = React.useMemo(() => getExtraProps?.(entry), [getExtraProps, entry]);
+
+		return (
+			<label className="entry">
+				<input
+					type="checkbox"
+					onChange={(e) => onChange({ checked: e.target.checked })}
+					checked={entry.checked}
+				/>
+				<EntryComponent entry={entry} onChange={onChange} extraProps={extraProps} />
+			</label>
+		);
+	}
+);
\ No newline at end of file
diff --git a/web/source/settings/components/form/inputs.jsx b/web/source/settings/components/form/inputs.jsx
index eef375ee8..19386b6f2 100644
--- a/web/source/settings/components/form/inputs.jsx
+++ b/web/source/settings/components/form/inputs.jsx
@@ -22,9 +22,10 @@ const React = require("react");
 
 function TextInput({ label, field, ...inputProps }) {
 	const { onChange, value, ref } = field;
+	console.log(field.name, field.valid, field.value);
 
 	return (
-		<div className="form-field text">
+		<div className={`form-field text${field.valid ? "" : " invalid"}`}>
 			<label>
 				{label}
 				<input
diff --git a/web/source/settings/lib/domain-block.js b/web/source/settings/lib/domain-block.js
new file mode 100644
index 000000000..d13c029d2
--- /dev/null
+++ b/web/source/settings/lib/domain-block.js
@@ -0,0 +1,50 @@
+/*
+	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 isValidDomain = require("is-valid-domain");
+const psl = require("psl");
+
+function isValidDomainBlock(domain) {
+	return isValidDomain(domain, {
+		/* 
+			Wildcard prefix *. can be stripped since it's equivalent to not having it,
+			but wildcard anywhere else in the domain is not handled by the backend so it's invalid.
+		*/
+		wildcard: false,
+		allowUnicode: true
+	});
+}
+
+/* 
+	Still can't think of a better function name for this,
+	but we're checking a domain against the Public Suffix List <https://publicsuffix.org/>
+	to see if we should suggest removing subdomain(s) since they're likely owned/ran by the same party
+	social.example.com -> suggests example.com
+*/
+function hasBetterScope(domain) {
+	const lookup = psl.get(domain);
+	if (lookup && lookup != domain) {
+		return lookup;
+	} else {
+		return false;
+	}
+}
+
+module.exports = { isValidDomainBlock, hasBetterScope };
\ No newline at end of file
diff --git a/web/source/settings/lib/form/check-list.jsx b/web/source/settings/lib/form/check-list.jsx
index c1233273d..b19e17a29 100644
--- a/web/source/settings/lib/form/check-list.jsx
+++ b/web/source/settings/lib/form/check-list.jsx
@@ -20,128 +20,163 @@
 
 const React = require("react");
 const syncpipe = require("syncpipe");
-
-function createState(entries, uniqueKey, oldState, defaultValue) {
-	return syncpipe(entries, [
-		(_) => _.map((entry) => {
-			let key = entry[uniqueKey];
-			return [
-				key,
-				{
-					...entry,
-					key,
-					checked: oldState[key]?.checked ?? entry.checked ?? defaultValue
+const { createSlice } = require("@reduxjs/toolkit");
+const { enableMapSet } = require("immer");
+
+enableMapSet(); // for use in reducers
+
+const { reducer, actions } = createSlice({
+	name: "checklist",
+	initialState: {}, // not handled by slice itself
+	reducers: {
+		updateAll: (state, { payload: checked }) => {
+			const selectedEntries = new Set();
+			return {
+				entries: syncpipe(state.entries, [
+					(_) => Object.values(_),
+					(_) => _.map((entry) => {
+						if (checked) {
+							selectedEntries.add(entry.key);
+						}
+						return [entry.key, {
+							...entry,
+							checked
+						}];
+					}),
+					(_) => Object.fromEntries(_)
+				]),
+				selectedEntries
+			};
+		},
+		update: (state, { payload: { key, value } }) => {
+			if (value.checked !== undefined) {
+				if (value.checked === true) {
+					state.selectedEntries.add(key);
+				} else {
+					state.selectedEntries.delete(key);
+				}
+			}
+
+			state.entries[key] = {
+				...state.entries[key],
+				...value
+			};
+		},
+		updateMultiple: (state, { payload }) => {
+			payload.forEach(([key, value]) => {
+				if (value.checked !== undefined) {
+					if (value.checked === true) {
+						state.selectedEntries.add(key);
+					} else {
+						state.selectedEntries.delete(key);
+					}
 				}
-			];
-		}),
-		(_) => Object.fromEntries(_)
-	]);
-}
 
-function updateAllState(state, newValue) {
-	return syncpipe(state, [
-		(_) => Object.values(_),
-		(_) => _.map((entry) => [entry.key, {
-			...entry,
-			checked: newValue
-		}]),
-		(_) => Object.fromEntries(_)
-	]);
-}
+				state.entries[key] = {
+					...state.entries[key],
+					...value
+				};
+			});
+		}
+	}
+});
 
-function updateState(state, key, newValue) {
+function initialState({ entries, uniqueKey, defaultValue }) {
+	const selectedEntries = new Set();
 	return {
-		...state,
-		[key]: {
-			...state[key],
-			...newValue
-		}
+		entries: syncpipe(entries, [
+			(_) => _.map((entry) => {
+				let key = entry[uniqueKey];
+				let checked = entry.checked ?? defaultValue;
+
+				if (checked) {
+					selectedEntries.add(key);
+				} else {
+					selectedEntries.delete(key);
+				}
+
+				return [
+					key,
+					{
+						...entry,
+						key,
+						checked
+					}
+				];
+			}),
+			(_) => Object.fromEntries(_)
+		]),
+		selectedEntries
 	};
 }
 
 module.exports = function useCheckListInput({ name }, { entries, uniqueKey = "key", defaultValue = false }) {
-	const [state, setState] = React.useState({});
+	const [state, dispatch] = React.useReducer(reducer, null,
+		() => initialState({ entries, uniqueKey, defaultValue }) // initial state
+	);
 
-	const [someSelected, setSomeSelected] = React.useState(false);
-	const [toggleAllState, setToggleAllState] = React.useState(0);
 	const toggleAllRef = React.useRef(null);
 
 	React.useEffect(() => {
-		/* 
-			entries changed, update state,
-			re-using old state if available for key
-		*/
-		setState(createState(entries, uniqueKey, state, defaultValue));
-
-		/* eslint-disable-next-line react-hooks/exhaustive-deps */
-	}, [entries]);
-
-	React.useEffect(() => {
-		/* Updates (un)check all checkbox, based on shortcode checkboxes
-			 Can be 0 (not checked), 1 (checked) or 2 (indeterminate)
-		 */
-		if (toggleAllRef.current == null) {
-			return;
+		if (toggleAllRef.current != null) {
+			let some = state.selectedEntries.size > 0;
+			let all = false;
+			if (some) {
+				all = state.selectedEntries.size == Object.values(state.entries).length;
+			}
+			toggleAllRef.current.checked = all;
+			toggleAllRef.current.indeterminate = some && !all;
 		}
-
-		let values = Object.values(state);
-		/* one or more boxes are checked */
-		let some = values.some((v) => v.checked);
-
-		let all = false;
-		if (some) {
-			/* there's not at least one unchecked box */
-			all = !values.some((v) => v.checked == false);
+		// only needs to update when state.selectedEntries changes, not state.entries
+		// eslint-disable-next-line react-hooks/exhaustive-deps
+	}, [state.selectedEntries]);
+
+	const reset = React.useCallback(
+		() => dispatch(actions.updateAll(defaultValue)),
+		[defaultValue]
+	);
+
+	const onChange = React.useCallback(
+		(key, value) => dispatch(actions.update({ key, value })),
+		[]
+	);
+
+	const updateMultiple = React.useCallback(
+		(entries) => dispatch(actions.updateMultiple(entries)),
+		[]
+	);
+
+	return React.useMemo(() => {
+		function toggleAll(e) {
+			let checked = e.target.checked;
+			if (e.target.indeterminate) {
+				checked = false;
+			}
+			dispatch(actions.updateAll(checked));
 		}
 
-		setSomeSelected(some);
-
-		if (some && !all) {
-			setToggleAllState(2);
-			toggleAllRef.current.indeterminate = true;
-		} else {
-			setToggleAllState(all ? 1 : 0);
-			toggleAllRef.current.indeterminate = false;
+		function selectedValues() {
+			return Array.from((state.selectedEntries)).map((key) => ({
+				...state.entries[key] // returned as new object, because reducer state is immutable
+			}));
 		}
-	}, [state, toggleAllRef]);
-
-	function toggleAll(e) {
-		let selectAll = e.target.checked;
 
-		if (toggleAllState == 2) { // indeterminate
-			selectAll = false;
-		}
-
-		setState(updateAllState(state, selectAll));
-		setToggleAllState(selectAll);
-	}
-
-	function reset() {
-		setState(updateAllState(state, defaultValue));
-	}
-
-	function selectedValues() {
-		return syncpipe(state, [
-			(_) => Object.values(_),
-			(_) => _.filter((entry) => entry.checked)
-		]);
-	}
-
-	return Object.assign([
-		state,
-		reset,
-		{ name }
-	], {
-		name,
-		value: state,
-		onChange: (key, newValue) => setState(updateState(state, key, newValue)),
-		selectedValues,
-		reset,
-		someSelected,
-		toggleAll: {
-			ref: toggleAllRef,
-			value: toggleAllState,
-			onChange: toggleAll
-		}
-	});
+		return Object.assign([
+			state,
+			reset,
+			{ name }
+		], {
+			name,
+			value: state.entries,
+			onChange,
+			selectedValues,
+			reset,
+			someSelected: state.someChecked,
+			updateMultiple,
+			toggleAll: {
+				ref: toggleAllRef,
+				onChange: toggleAll
+			}
+		});
+	}, [state, reset, name, onChange, updateMultiple]);
 };
\ No newline at end of file
diff --git a/web/source/settings/lib/form/text.jsx b/web/source/settings/lib/form/text.jsx
index 70e61657c..d9a9ab28c 100644
--- a/web/source/settings/lib/form/text.jsx
+++ b/web/source/settings/lib/form/text.jsx
@@ -20,14 +20,30 @@
 
 const React = require("react");
 
-module.exports = function useTextInput({ name, Name }, { validator, defaultValue = "", dontReset = false } = {}) {
+module.exports = function useTextInput({ name, Name }, {
+	defaultValue = "",
+	dontReset = false,
+	validator,
+	showValidation = true,
+	initValidation
+} = {}) {
+
 	const [text, setText] = React.useState(defaultValue);
-	const [valid, setValid] = React.useState(true);
 	const textRef = React.useRef(null);
 
+	const [validation, setValidation] = React.useState(initValidation ?? "");
+	const [_isValidating, startValidation] = React.useTransition();
+	let valid = validation == "";
+
 	function onChange(e) {
 		let input = e.target.value;
 		setText(input);
+
+		if (validator) {
+			startValidation(() => {
+				setValidation(validator(input));
+			});
+		}
 	}
 
 	function reset() {
@@ -38,11 +54,13 @@ module.exports = function useTextInput({ name, Name }, { validator, defaultValue
 
 	React.useEffect(() => {
 		if (validator && textRef.current) {
-			let res = validator(text);
-			setValid(res == "");
-			textRef.current.setCustomValidity(res);
+			if (showValidation) {
+				textRef.current.setCustomValidity(validation);
+			} else {
+				textRef.current.setCustomValidity("");
+			}
 		}
-	}, [text, textRef, validator]);
+	}, [validation, validator, showValidation]);
 
 	// Array / Object hybrid, for easier access in different contexts
 	return Object.assign([
@@ -62,6 +80,7 @@ module.exports = function useTextInput({ name, Name }, { validator, defaultValue
 		ref: textRef,
 		setter: setText,
 		valid,
+		validate: () => setValidation(validator(text)),
 		hasChanged: () => text != defaultValue
 	});
 };
\ No newline at end of file
diff --git a/web/source/settings/lib/query/admin/import-export.js b/web/source/settings/lib/query/admin/import-export.js
index 94e462bd2..a4a8b65e3 100644
--- a/web/source/settings/lib/query/admin/import-export.js
+++ b/web/source/settings/lib/query/admin/import-export.js
@@ -19,8 +19,11 @@
 "use strict";
 
 const Promise = require("bluebird");
-const isValidDomain = require("is-valid-domain");
 const fileDownload = require("js-file-download");
+const csv = require("papaparse");
+const { nanoid } = require("nanoid");
+
+const { isValidDomainBlock, hasBetterScope } = require("../../domain-block");
 
 const {
 	replaceCacheOnMutation,
@@ -31,6 +34,23 @@ const {
 function parseDomainList(list) {
 	if (list[0] == "[") {
 		return JSON.parse(list);
+	} else if (list.startsWith("#domain")) { // Mastodon CSV
+		const { data, errors } = csv.parse(list, {
+			header: true,
+			transformHeader: (header) => header.slice(1), // removes starting '#'
+			skipEmptyLines: true,
+			dynamicTyping: true
+		});
+
+		if (errors.length > 0) {
+			let error = "";
+			errors.forEach((err) => {
+				error += `${err.message} (line ${err.row})`;
+			});
+			throw error;
+		}
+
+		return data;
 	} else {
 		return list.split("\n").map((line) => {
 			let domain = line.trim();
@@ -51,7 +71,15 @@ function parseDomainList(list) {
 
 function validateDomainList(list) {
 	list.forEach((entry) => {
-		entry.valid = (entry.valid !== false) && isValidDomain(entry.domain, { wildcard: true, allowUnicode: true });
+		if (entry.domain.startsWith("*.")) {
+			// domain block always includes all subdomains, wildcard is meaningless here
+			entry.domain = entry.domain.slice(2);
+		}
+
+		entry.valid = (entry.valid !== false) && isValidDomainBlock(entry.domain);
+		if (entry.valid) {
+			entry.suggest = hasBetterScope(entry.domain);
+		}
 		entry.checked = entry.valid;
 	});
 
@@ -83,6 +111,9 @@ module.exports = (build) => ({
 			}).then((deduped) => {
 				return validateDomainList(deduped);
 			}).then((data) => {
+				data.forEach((entry) => {
+					entry.key = nanoid(); // unique id that stays stable even if domain gets modified by user
+				});
 				return { data };
 			}).catch((e) => {
 				return { error: e.toString() };
@@ -91,27 +122,53 @@ module.exports = (build) => ({
 	}),
 	exportDomainList: build.mutation({
 		queryFn: (formData, api, _extraOpts, baseQuery) => {
+			let process;
+
+			if (formData.exportType == "json") {
+				process = {
+					transformEntry: (entry) => ({
+						domain: entry.domain,
+						public_comment: entry.public_comment,
+						obfuscate: entry.obfuscate
+					}),
+					stringify: (list) => JSON.stringify(list),
+					extension: ".json",
+					mime: "application/json"
+				};
+			} else if (formData.exportType == "csv") {
+				process = {
+					transformEntry: (entry) => [
+						entry.domain,
+						"suspend", // severity
+						false, // reject_media
+						false, // reject_reports
+						entry.public_comment,
+						entry.obfuscate ?? false
+					],
+					stringify: (list) => csv.unparse({
+						fields: "#domain,#severity,#reject_media,#reject_reports,#public_comment,#obfuscate".split(","),
+						data: list
+					}),
+					extension: ".csv",
+					mime: "text/csv"
+				};
+			} else {
+				process = {
+					transformEntry: (entry) => entry.domain,
+					stringify: (list) => list.join("\n"),
+					extension: ".txt",
+					mime: "text/plain"
+				};
+			}
+
 			return Promise.try(() => {
 				return baseQuery({
 					url: `/api/v1/admin/domain_blocks`
 				});
 			}).then(unwrapRes).then((blockedInstances) => {
-				return blockedInstances.map((entry) => {
-					if (formData.exportType == "json") {
-						return {
-							domain: entry.domain,
-							public_comment: entry.public_comment
-						};
-					} else {
-						return entry.domain;
-					}
-				});
+				return blockedInstances.map(process.transformEntry);
 			}).then((exportList) => {
-				if (formData.exportType == "json") {
-					return JSON.stringify(exportList);
-				} else {
-					return exportList.join("\n");
-				}
+				return process.stringify(exportList);
 			}).then((exportAsString) => {
 				if (formData.action == "export") {
 					return {
@@ -120,7 +177,6 @@ module.exports = (build) => ({
 				} else if (formData.action == "export-file") {
 					let domain = new URL(api.getState().oauth.instance).host;
 					let date = new Date();
-					let mime;
 
 					let filename = [
 						domain,
@@ -130,15 +186,11 @@ module.exports = (build) => ({
 						date.getDate().toString().padStart(2, "0"),
 					].join("-");
 
-					if (formData.exportType == "json") {
-						filename += ".json";
-						mime = "application/json";
-					} else {
-						filename += ".txt";
-						mime = "text/plain";
-					}
-
-					fileDownload(exportAsString, filename, mime);
+					fileDownload(
+						exportAsString,
+						filename + process.extension,
+						process.mime
+					);
 				}
 				return { data: null };
 			}).catch((e) => {
@@ -171,6 +223,7 @@ module.exports = (build) => ({
 	})
 });
 
+const internalKeys = new Set("key,suggest,valid,checked".split(","));
 function entryProcessor(formData) {
 	let funcs = [];
 
@@ -204,7 +257,7 @@ function entryProcessor(formData) {
 		entry.obfuscate = formData.obfuscate;
 
 		Object.entries(entry).forEach(([key, val]) => {
-			if (val == undefined) {
+			if (internalKeys.has(key) || val == undefined) {
 				delete entry[key];
 			}
 		});
diff --git a/web/source/settings/style.css b/web/source/settings/style.css
index d46df683a..7affd8269 100644
--- a/web/source/settings/style.css
+++ b/web/source/settings/style.css
@@ -69,6 +69,10 @@ section {
 			&:last-child {
 				margin-bottom: 0;
 			}
+
+			&.without-border {
+				border-left: 0;
+			}
 		}
 	}
 
@@ -370,7 +374,8 @@ span.form-info {
 
 .checkbox-list {
 	.header, .entry {
-		gap: 1rem;
+		display: grid;
+		gap: 0 1rem;
 	}
 }
 
@@ -629,7 +634,6 @@ span.form-info {
 
 		.checkbox-list {
 			.entry {
-				display: grid;
 				grid-template-columns: auto auto 1fr;
 			}
 
@@ -688,9 +692,14 @@ button.with-padding {
 
 .suspend-import-list {
 	.checkbox-list {
-		.header, .entry {
-			display: grid;
+		.entry {
 			grid-template-columns: auto 25ch auto 1fr;
+			grid-template-rows: auto 1fr;
+
+			p {
+				grid-column: 4;
+				grid-row: 1 / span 2;
+			}
 		}
 	}
 
@@ -704,6 +713,10 @@ button.with-padding {
 			color: $green1;
 		}
 
+		#icon .suggest-changes {
+			color: $orange2;
+		}
+
 		p {
 			align-self: center;
 			margin: 0;
@@ -711,6 +724,75 @@ button.with-padding {
 	}
 }
 
+.import-export {
+	p {
+		margin: 0;
+	}
+
+	.export-file {
+		display: flex;
+		gap: 0.7rem;
+		align-items: center;
+	}
+
+	.button-grid {
+		display: inline-grid;
+		grid-template-columns: auto auto auto;
+		align-self: start;
+		gap: 0.5rem;
+
+		button {
+			width: 100%;
+		}
+	}
+}
+
+.update-hints {
+	background: $list-entry-alternate-bg;
+	border: 0.1rem solid $border-accent;
+	/* border-radius: $br; */
+	padding: 0.5rem;
+	display: flex;
+	flex-direction: column;
+
+	.hints {
+		max-width: 100%;
+		align-self: start;
+		align-items: center;
+		margin: 1rem 0;
+		display: inline-grid;
+		grid-template-columns: auto auto auto auto;
+		gap: 1rem;
+	}
+}
+
+.export-format-table {
+	width: 100%;
+	background: $list-entry-alternate-bg;
+	border-collapse: collapse;
+
+	th, td {
+		border: 0.1rem solid $gray1;
+		padding: 0.3rem;
+	}
+
+	th {
+		background: $list-entry-bg;
+	}
+
+	td {
+		text-align: center;
+
+		.fa-check {
+			color: $green1;
+		}
+
+		.fa-times {
+			color: $error3;
+		}
+	}
+}
+
 .form-field.radio {
 	&, label {
 		display: flex;
@@ -723,6 +805,10 @@ button.with-padding {
 	}
 }
 
+[role="button"] {
+	cursor: pointer;
+}
+
 @keyframes fadeout {
 	from {
 		opacity: 1;