[frogend] Emoji copy "Steal this look" (#1222)

* split emoji into local and remote, allow looking up remote emoji by toot url

* optimize some/all filtering

* fix local emoji routes

* implement copy action

* shortcode validation, don't wipe form on error

* copy & disable PATCH

* remove local toot acceptance for testing

* unused import

* parse emoji from account and status, get web_url from status uri

* fix url parse

* submit button loading info

* actually send category

* code cleanup, distinguish between account and status responses

* use loading icons

* fix loading icon on federation page

* require Loading element

* remove unused require

* query explanation, small accessibility tweaks

13 files changed, 623 insertions, 33 deletions

diff --git a/web/source/css/base.css b/web/source/css/base.css
index d2fa95a3b..73b533733 100644
--- a/web/source/css/base.css
+++ b/web/source/css/base.css
@@ -394,3 +394,13 @@ footer {
 		color: $gray1;
 	}
 }
+
+label {
+	cursor: pointer;
+}
+
+@media (prefers-reduced-motion) {
+	.fa-spin {
+		animation: none;
+	}
+}
\ No newline at end of file
diff --git a/web/source/settings/admin/emoji/detail.js b/web/source/settings/admin/emoji/local/detail.js
index 51e291448..179ee7c7c 100644
--- a/web/source/settings/admin/emoji/detail.js
+++ b/web/source/settings/admin/emoji/local/detail.js
@@ -22,13 +22,14 @@ const React = require("react");
 
 const { useRoute, Link, Redirect } = require("wouter");
 
-const { CategorySelect } = require("./category-select");
-const { useComboBoxInput, useFileInput } = require("../../components/form");
+const { CategorySelect } = require("../category-select");
+const { useComboBoxInput, useFileInput } = require("../../../components/form");
 
-const query = require("../../lib/query");
-const FakeToot = require("../../components/fake-toot");
+const query = require("../../../lib/query");
+const FakeToot = require("../../../components/fake-toot");
+const Loading = require("../../../components/loading");
 
-const base = "/settings/admin/custom-emoji";
+const base = "/settings/custom-emoji/local";
 
 module.exports = function EmojiDetailRoute() {
 	let [_match, params] = useRoute(`${base}/:emojiId`);
@@ -54,7 +55,11 @@ function EmojiDetailData({emojiId}) {
 			</div>
 		);
 	} else if (isLoading) {
-		return "Loading...";
+		return (
+			<div>
+				<Loading/>
+			</div>
+		);
 	} else {
 		return <EmojiDetail emoji={emoji}/>;
 	}
diff --git a/web/source/settings/admin/emoji/index.js b/web/source/settings/admin/emoji/local/index.js
index 0fcda8264..1ccdece72 100644
--- a/web/source/settings/admin/emoji/index.js
+++ b/web/source/settings/admin/emoji/local/index.js
@@ -24,7 +24,7 @@ const {Switch, Route} = require("wouter");
 const EmojiOverview = require("./overview");
 const EmojiDetail = require("./detail");
 
-const base = "/settings/admin/custom-emoji";
+const base = "/settings/custom-emoji/local";
 
 module.exports = function CustomEmoji() {
 	return (
diff --git a/web/source/settings/admin/emoji/new-emoji.js b/web/source/settings/admin/emoji/local/new-emoji.js
index 8cd604c02..985be2d32 100644
--- a/web/source/settings/admin/emoji/new-emoji.js
+++ b/web/source/settings/admin/emoji/local/new-emoji.js
@@ -21,17 +21,19 @@
 const Promise = require('bluebird');
 const React = require("react");
 
-const FakeToot = require("../../components/fake-toot");
-const MutateButton = require("../../components/mutation-button");
+const FakeToot = require("../../../components/fake-toot");
+const MutateButton = require("../../../components/mutation-button");
 
 const {
 	useTextInput,
 	useFileInput,
 	useComboBoxInput
-} = require("../../components/form");
+} = require("../../../components/form");
 
-const query = require("../../lib/query");
-const { CategorySelect } = require('./category-select');
+const query = require("../../../lib/query");
+const { CategorySelect } = require('../category-select');
+
+const shortcodeRegex = /^[a-z0-9_]+$/;
 
 module.exports = function NewEmojiForm({ emoji }) {
 	const emojiCodes = React.useMemo(() => {
@@ -47,9 +49,26 @@ module.exports = function NewEmojiForm({ emoji }) {
 
 	const [onShortcodeChange, resetShortcode, { shortcode, setShortcode, shortcodeRef }] = useTextInput("shortcode", {
 		validator: function validateShortcode(code) {
-			return emojiCodes.has(code)
-				? "Shortcode already in use"
-				: "";
+			// technically invalid, but hacky fix to prevent validation error on page load
+			if (shortcode == "") {return "";}
+
+			if (emojiCodes.has(code)) {
+				return "Shortcode already in use";
+			}
+
+			if (code.length < 2 || code.length > 30) {
+				return "Shortcode must be between 2 and 30 characters";
+			}
+
+			if (code.toLowerCase() != code) {
+				return "Shortcode must be lowercase";
+			}
+
+			if (!shortcodeRegex.test(code)) {
+				return "Shortcode must only contain lowercase letters, numbers, and underscores";
+			}
+
+			return "";
 		}
 	});
 
@@ -78,11 +97,13 @@ module.exports = function NewEmojiForm({ emoji }) {
 				image,
 				shortcode,
 				category
-			});
+			}).unwrap();
 		}).then(() => {
 			resetFile();
 			resetShortcode();
 			resetCategory();
+		}).catch((e) => {
+			console.error("Emoji upload error:", e);
 		});
 	}
 
diff --git a/web/source/settings/admin/emoji/overview.js b/web/source/settings/admin/emoji/local/overview.js
index b8ac87a0f..7a5cfaad6 100644
--- a/web/source/settings/admin/emoji/overview.js
+++ b/web/source/settings/admin/emoji/local/overview.js
@@ -23,10 +23,11 @@ const {Link} = require("wouter");
 
 const NewEmojiForm = require("./new-emoji");
 
-const query = require("../../lib/query");
-const { useEmojiByCategory } = require("./category-select");
+const query = require("../../../lib/query");
+const { useEmojiByCategory } = require("../category-select");
+const Loading = require("../../../components/loading");
 
-const base = "/settings/admin/custom-emoji";
+const base = "/settings/custom-emoji/local";
 
 module.exports = function EmojiOverview() {
 	const {
@@ -37,12 +38,12 @@ module.exports = function EmojiOverview() {
 
 	return (
 		<>
-			<h1>Custom Emoji</h1>
+			<h1>Custom Emoji (local)</h1>
 			{error && 
 				<div className="error accent">{error}</div>
 			}
 			{isLoading
-				? "Loading..."
+				? <Loading/>
 				: <>
 					<EmojiList emoji={emoji}/>
 					<NewEmojiForm emoji={emoji}/>
diff --git a/web/source/settings/admin/emoji/remote/index.js b/web/source/settings/admin/emoji/remote/index.js
new file mode 100644
index 000000000..ae59673a5
--- /dev/null
+++ b/web/source/settings/admin/emoji/remote/index.js
@@ -0,0 +1,54 @@
+/*
+	GoToSocial
+	Copyright (C) 2021-2022 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 ParseFromToot = require("./parse-from-toot");
+
+const query = require("../../../lib/query");
+const Loading = require("../../../components/loading");
+
+module.exports = function RemoteEmoji() {
+	// local emoji are queried for shortcode collision detection
+	const {
+		data: emoji = [],
+		isLoading,
+		error
+	} = query.useGetAllEmojiQuery({filter: "domain:local"});
+
+	const emojiCodes = React.useMemo(() => {
+		return new Set(emoji.map((e) => e.shortcode));
+	}, [emoji]);
+
+	return (
+		<>
+			<h1>Custom Emoji (remote)</h1>
+			{error && 
+				<div className="error accent">{error}</div>
+			}
+			{isLoading
+				? <Loading/>
+				: <>
+					<ParseFromToot emoji={emoji} emojiCodes={emojiCodes} />
+				</>
+			}
+		</>
+	);
+};
\ No newline at end of file
diff --git a/web/source/settings/admin/emoji/remote/parse-from-toot.js b/web/source/settings/admin/emoji/remote/parse-from-toot.js
new file mode 100644
index 000000000..75ff8bf7a
--- /dev/null
+++ b/web/source/settings/admin/emoji/remote/parse-from-toot.js
@@ -0,0 +1,319 @@
+/*
+	GoToSocial
+	Copyright (C) 2021-2022 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 Promise = require("bluebird");
+const React = require("react");
+const Redux = require("react-redux");
+const syncpipe = require("syncpipe");
+
+const {
+	useTextInput,
+	useComboBoxInput
+} = require("../../../components/form");
+
+const { CategorySelect } = require('../category-select');
+
+const query = require("../../../lib/query");
+const Loading = require("../../../components/loading");
+
+module.exports = function ParseFromToot({ emojiCodes }) {
+	const [searchStatus, { data, isLoading, isSuccess, error }] = query.useSearchStatusForEmojiMutation();
+	const instanceDomain = Redux.useSelector((state) => (new URL(state.oauth.instance).host));
+
+	const [onURLChange, _resetURL, { url }] = useTextInput("url");
+
+	const searchResult = React.useMemo(() => {
+		if (!isSuccess) {
+			return null;
+		}
+
+		if (data.type == "none") {
+			return "No results found";
+		}
+
+		if (data.domain == instanceDomain) {
+			return <b>This is a local user/toot, all referenced emoji are already on your instance</b>;
+		}
+
+		if (data.list.length == 0) {
+			return <b>This {data.type == "statuses" ? "toot" : "account"} doesn't use any custom emoji</b>;
+		}
+
+		return (
+			<CopyEmojiForm
+				localEmojiCodes={emojiCodes}
+				type={data.type}
+				domain={data.domain}
+				emojiList={data.list}
+			/>
+		);
+	}, [isSuccess, data, instanceDomain, emojiCodes]);
+
+	function submitSearch(e) {
+		e.preventDefault();
+		searchStatus(url);
+	}
+
+	return (
+		<div className="parse-emoji">
+			<h2>Steal this look</h2>
+			<form onSubmit={submitSearch}>
+				<div className="form-field text">
+					<label htmlFor="url">
+						Link to a toot:
+					</label>
+					<div className="row">
+						<input
+							type="text"
+							id="url"
+							name="url"
+							onChange={onURLChange}
+							value={url}
+						/>
+						<button disabled={isLoading}>
+							<i className={[
+								"fa",
+								(isLoading
+									? "fa-refresh fa-spin"
+									: "fa-search")
+							].join(" ")} aria-hidden="true" title="Search"/>
+							<span className="sr-only">Search</span>
+						</button>
+					</div>
+					{isLoading && <Loading/>}
+					{error && <div className="error">{error.data.error}</div>}
+				</div>
+			</form>
+			{searchResult}
+		</div>
+	);
+};
+
+function makeEmojiState(emojiList, checked) {
+	/* Return a new object, with a key for every emoji's shortcode,
+		 And a value for it's checkbox `checked` state.
+	 */
+	return syncpipe(emojiList, [
+		(_) => _.map((emoji) => [emoji.shortcode, {
+			checked,
+			valid: true
+		}]),
+		(_) => Object.fromEntries(_)
+	]);
+}
+
+function updateEmojiState(emojiState, checked) {
+	/* Create a new object with all emoji entries' checked state updated */
+	return syncpipe(emojiState, [
+		(_) => Object.entries(emojiState),
+		(_) => _.map(([key, val]) => [key, {
+			...val,
+			checked
+		}]),
+		(_) => Object.fromEntries(_)
+	]);
+}
+
+function CopyEmojiForm({ localEmojiCodes, type, domain, emojiList }) {
+	const [patchRemoteEmojis, patchResult] = query.usePatchRemoteEmojisMutation();
+	const [err, setError] = React.useState();
+
+	const toggleAllRef = React.useRef(null);
+	const [toggleAllState, setToggleAllState] = React.useState(0);
+	const [emojiState, setEmojiState] = React.useState(makeEmojiState(emojiList, false));
+	const [someSelected, setSomeSelected] = React.useState(false);
+
+	const [categoryState, resetCategory, { category }] = useComboBoxInput("category");
+
+	React.useEffect(() => {
+		if (emojiList != undefined) {
+			setEmojiState(makeEmojiState(emojiList, false));
+		}
+	}, [emojiList]);
+
+	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;
+		}
+
+		let values = Object.values(emojiState);
+		/* 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);
+		}
+
+		setSomeSelected(some);
+
+		if (some && !all) {
+			setToggleAllState(2);
+			toggleAllRef.current.indeterminate = true;
+		} else {
+			setToggleAllState(all ? 1 : 0);
+			toggleAllRef.current.indeterminate = false;
+		}
+	}, [emojiState, toggleAllRef]);
+
+	function updateEmoji(shortcode, value) {
+		setEmojiState({
+			...emojiState,
+			[shortcode]: {
+				...emojiState[shortcode],
+				...value
+			}
+		});
+	}
+
+	function toggleAll(e) {
+		let selectAll = e.target.checked;
+
+		if (toggleAllState == 2) { // indeterminate
+			selectAll = false;
+		}
+
+		setEmojiState(updateEmojiState(emojiState, selectAll));
+		setToggleAllState(selectAll);
+	}
+
+	function submit(action) {
+		Promise.try(() => {
+			setError(null);
+			const selectedShortcodes = syncpipe(emojiState, [
+				(_) => Object.entries(_),
+				(_) => _.filter(([_shortcode, entry]) => entry.checked),
+				(_) => _.map(([shortcode, entry]) => {
+					if (action == "copy" && !entry.valid) {
+						throw `One or more selected emoji have non-unique shortcodes (${shortcode}), unselect them or pick a different local shortcode`;
+					}
+					return {
+						shortcode,
+						localShortcode: entry.shortcode
+					};
+				})
+			]);
+
+			return patchRemoteEmojis({
+				action,
+				domain,
+				list: selectedShortcodes,
+				category
+			}).unwrap();
+		}).then(() => {
+			setEmojiState(makeEmojiState(emojiList, false));
+			resetCategory();
+		}).catch((e) => {
+			if (Array.isArray(e)) {
+				setError(e.map(([shortcode, msg]) => (
+					<div key={shortcode}>
+						{shortcode}: <span style={{ fontWeight: "initial" }}>{msg}</span>
+					</div>
+				)));
+			} else {
+				setError(e);
+			}
+		});
+	}
+
+	return (
+		<div className="parsed">
+			<span>This {type == "statuses" ? "toot" : "account"} uses the following custom emoji, select the ones you want to copy/disable:</span>
+			<div className="emoji-list">
+				<label className="header">
+					<input
+						ref={toggleAllRef}
+						type="checkbox"
+						onChange={toggleAll}
+						checked={toggleAllState === 1}
+					/> All
+				</label>
+				{emojiList.map((emoji) => (
+					<EmojiEntry
+						key={emoji.shortcode}
+						emoji={emoji}
+						localEmojiCodes={localEmojiCodes}
+						updateEmoji={(value) => updateEmoji(emoji.shortcode, value)}
+						checked={emojiState[emoji.shortcode].checked}
+					/>
+				))}
+			</div>
+
+			<CategorySelect
+				value={category}
+				categoryState={categoryState}
+			/>
+
+			<div className="action-buttons row">
+				<button disabled={!someSelected} onClick={() => submit("copy")}>{patchResult.isLoading ? "Processing..." : "Copy to local emoji"}</button>
+				<button disabled={!someSelected} onClick={() => submit("disable")} className="danger">{patchResult.isLoading ? "Processing..." : "Disable"}</button>
+			</div>
+			{err && <div className="error">
+				{err}
+			</div>}
+			{patchResult.isSuccess && <div>
+				Action applied to {patchResult.data.length} emoji
+			</div>}
+		</div>
+	);
+}
+
+function EmojiEntry({ emoji, localEmojiCodes, updateEmoji, checked }) {
+	const [onShortcodeChange, _resetShortcode, { shortcode, shortcodeRef, shortcodeValid }] = useTextInput("shortcode", {
+		defaultValue: emoji.shortcode,
+		validator: function validateShortcode(code) {
+			return (checked && localEmojiCodes.has(code))
+				? "Shortcode already in use"
+				: "";
+		}
+	});
+
+	React.useEffect(() => {
+		updateEmoji({ valid: shortcodeValid });
+		/* eslint-disable-next-line react-hooks/exhaustive-deps */
+	}, [shortcodeValid]);
+
+	return (
+		<label key={emoji.shortcode} className="row">
+			<input
+				type="checkbox"
+				onChange={(e) => updateEmoji({ checked: e.target.checked })}
+				checked={checked}
+			/>
+			<img className="emoji" src={emoji.url} title={emoji.shortcode} />
+
+			<input
+				type="text"
+				id="shortcode"
+				name="Shortcode"
+				ref={shortcodeRef}
+				onChange={(e) => {
+					onShortcodeChange(e);
+					updateEmoji({ shortcode: e.target.value, checked: true });
+				}}
+				value={shortcode}
+			/>
+		</label>
+	);
+}
\ No newline at end of file
diff --git a/web/source/settings/admin/federation.js b/web/source/settings/admin/federation.js
index 753024e58..f1023d365 100644
--- a/web/source/settings/admin/federation.js
+++ b/web/source/settings/admin/federation.js
@@ -30,6 +30,7 @@ const api = require("../lib/api");
 const adminActions = require("../redux/reducers/admin").actions;
 const submit = require("../lib/submit");
 const BackButton = require("../components/back-button");
+const Loading = require("../components/loading");
 
 const base = "/settings/admin/federation";
 
@@ -56,7 +57,9 @@ module.exports = function AdminSettings() {
 		return (
 			<div>
 				<h1>Federation</h1>
-				Loading...
+				<div>
+					<Loading/>
+				</div>
 			</div>
 		);
 	}
@@ -321,7 +324,7 @@ function InstancePage({domain, Form}) {
 	const [statusMsg, setStatus] = React.useState("");
 
 	if (entry == undefined) {
-		return "Loading...";
+		return <Loading/>;
 	}
 
 	const updateBlock = submit(
diff --git a/web/source/settings/components/form/text.jsx b/web/source/settings/components/form/text.jsx
index a392239dc..c24628dd7 100644
--- a/web/source/settings/components/form/text.jsx
+++ b/web/source/settings/components/form/text.jsx
@@ -20,17 +20,14 @@
 
 const React = require("react");
 
-module.exports = function useTextInput({name, Name}, {validator} = {}) {
-	const [text, setText] = React.useState("");
+module.exports = function useTextInput({name, Name}, {validator, defaultValue=""} = {}) {
+	const [text, setText] = React.useState(defaultValue);
+	const [valid, setValid] = React.useState(true);
 	const textRef = React.useRef(null);
 
 	function onChange(e) {
 		let input = e.target.value;
 		setText(input);
-
-		if (validator) {
-			validator(input);
-		}
 	}
 
 	function reset() {
@@ -39,7 +36,9 @@ module.exports = function useTextInput({name, Name}, {validator} = {}) {
 
 	React.useEffect(() => {
 		if (validator) {
-			textRef.current.setCustomValidity(validator(text));
+			let res = validator(text);
+			setValid(res == "");
+			textRef.current.setCustomValidity(res);
 			textRef.current.reportValidity();
 		}
 	}, [text, textRef, validator]);
@@ -50,7 +49,8 @@ module.exports = function useTextInput({name, Name}, {validator} = {}) {
 		{
 			[name]: text,
 			[`${name}Ref`]: textRef,
-			[`set${Name}`]: setText
+			[`set${Name}`]: setText,
+			[`${name}Valid`]: valid
 		}
 	];
 };
\ No newline at end of file
diff --git a/web/source/settings/components/loading.jsx b/web/source/settings/components/loading.jsx
new file mode 100644
index 000000000..51ce3a18b
--- /dev/null
+++ b/web/source/settings/components/loading.jsx
@@ -0,0 +1,27 @@
+/*
+	GoToSocial
+	Copyright (C) 2021-2022 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 Loading() {
+	return (
+		<i className="fa fa-spin fa-refresh" aria-label="Loading" title="Loading"/>
+	);
+};
\ No newline at end of file
diff --git a/web/source/settings/index.js b/web/source/settings/index.js
index 58afe5d28..b087f945c 100644
--- a/web/source/settings/index.js
+++ b/web/source/settings/index.js
@@ -32,6 +32,7 @@ const oauth = require("./redux/reducers/oauth").actions;
 const { AuthenticationError } = require("./lib/errors");
 
 const Login = require("./components/login");
+const Loading = require("./components/loading");
 
 require("./style.css");
 
@@ -46,7 +47,11 @@ const nav = {
 		"Instance Settings": require("./admin/settings.js"),
 		"Actions": require("./admin/actions"),
 		"Federation": require("./admin/federation.js"),
-		"Custom Emoji": require("./admin/emoji"),
+	},
+	"Custom Emoji": {
+		adminOnly: true,
+		"Local": require("./admin/emoji/local"),
+		"Remote": require("./admin/emoji/remote"),
 	}
 };
 
@@ -167,7 +172,7 @@ function App() {
 function Main() {
 	return (
 		<Provider store={store}>
-			<PersistGate loading={"loading..."} persistor={persistor}>
+			<PersistGate loading={<section><Loading/></section>} persistor={persistor}>
 				<App />
 			</PersistGate>
 		</Provider>
diff --git a/web/source/settings/lib/query/custom-emoji.js b/web/source/settings/lib/query/custom-emoji.js
index fa2a08db6..593556620 100644
--- a/web/source/settings/lib/query/custom-emoji.js
+++ b/web/source/settings/lib/query/custom-emoji.js
@@ -18,8 +18,18 @@
 
 "use strict";
 
+const Promise = require("bluebird");
+
 const base = require("./base");
 
+function unwrap(res) {
+	if (res.error != undefined) {
+		throw res.error;
+	} else {
+		return res.data;
+	}
+}
+
 const endpoints = (build) => ({
 	getAllEmoji: build.query({
 		query: (params = {}) => ({
@@ -77,6 +87,93 @@ const endpoints = (build) => ({
 			url: `/api/v1/admin/custom_emojis/${id}`
 		}),
 		invalidatesTags: (res, error, id) => [{type: "Emojis", id}]
+	}),
+	searchStatusForEmoji: build.mutation({
+		query: (url) => ({
+			method: "GET",
+			url: `/api/v2/search?q=${encodeURIComponent(url)}&resolve=true&limit=1`
+		}),
+		transformResponse: (res) => {
+			/* Parses search response, prioritizing a toot result,
+			   and returns referenced custom emoji
+			*/
+			let type;
+
+			if (res.statuses.length > 0) {
+				type = "statuses";
+			} else if (res.accounts.length > 0) {
+				type = "accounts";
+			} else {
+				return {
+					type: "none"
+				};
+			}
+
+			let data = res[type][0];
+
+			return {
+				type,
+				domain: (new URL(data.url)).host, // to get WEB_DOMAIN, see https://github.com/superseriousbusiness/gotosocial/issues/1225
+				list: data.emojis
+			};
+		}
+	}),
+	patchRemoteEmojis: build.mutation({
+		queryFn: ({action, domain, list, category}, api, _extraOpts, baseQuery) => {
+			const data = [];
+			const errors = [];
+
+			return Promise.each(list, (emoji) => {
+				return Promise.try(() => {
+					return baseQuery({
+						method: "GET",
+						url: `/api/v1/admin/custom_emojis`,
+						params: {
+							filter: `domain:${domain},shortcode:${emoji.shortcode}`,
+							limit: 1
+						}
+					}).then(unwrap);
+				}).then(([lookup]) => {
+					if (lookup == undefined) { throw "not found"; }
+
+					let body = {
+						type: action
+					};
+
+					if (action == "copy") {
+						body.shortcode = emoji.localShortcode ?? emoji.shortcode;
+						if (category.trim().length != 0) {
+							body.category = category;
+						}
+					}
+
+					return baseQuery({
+						method: "PATCH",
+						url: `/api/v1/admin/custom_emojis/${lookup.id}`,
+						asForm: true,
+						body: body
+					}).then(unwrap);
+				}).then((res) => {
+					data.push([emoji.shortcode, res]);
+				}).catch((e) => {
+					console.error("emoji lookup for", emoji.shortcode, "failed:", e);
+					let msg = e.message ?? e;
+					if (e.data.error) {
+						msg = e.data.error;
+					}
+					errors.push([emoji.shortcode, msg]);
+				});
+			}).then(() => {
+				if (errors.length == 0) {
+					return { data };
+				} else {
+					return {
+						error: errors
+					};
+				}
+			});
+		},
+		invalidatesTags: () => [{type: "Emojis", id: "LIST"}]
 	})
 });
 
diff --git a/web/source/settings/style.css b/web/source/settings/style.css
index 7a71c3278..7ed2fb725 100644
--- a/web/source/settings/style.css
+++ b/web/source/settings/style.css
@@ -598,4 +598,52 @@ span.form-info {
 .left-border {
 	border-left: 0.2rem solid $border-accent;
 	padding-left: 0.4rem;
+}
+
+.parse-emoji {
+	.parsed {
+		margin-top: 0.5rem;
+		display: flex;
+		flex-direction: column;
+		gap: 1rem;
+
+		& > span {
+			margin-bottom: -1rem;
+		}
+		
+		.action-buttons {
+			gap: 1rem;
+		}
+
+		.emoji-list {
+			display: flex;
+			flex-direction: column;
+
+			& > * {
+				gap: 1rem;
+				align-items: center;
+				padding: 0.5rem 1rem;
+			}
+
+			.header {
+				background: $gray2;
+				display: flex;
+			}
+
+			.row {
+				display: grid;
+				grid-template-columns: auto auto 1fr;
+
+				&:hover {
+					background: $settings-entry-hover-bg;
+				}
+			}
+
+			.emoji {
+				height: 2rem;
+				width: 2rem;
+				margin: 0;
+			}
+		}
+	}
 }
\ No newline at end of file