[frontend] Custom Emoji Deletion (#994)

* re-add eslint

* fix oauth url getting too long

* actually attach single emoji get and delete routes

* basic emoji details + deletion using rtk query

* refactor emoji upload to rtk query

* clean up old redux api+reducers for custom emoji

* fix validation order

* refactor custom emoji form fields

* remove unused requires

* cleanup, fix most eslint errors

* more small eslint fixes

* fix max emoji size

* tiny bit of function documentation

web/source/settings/admin/emoji/new-emoji.js

@@ -0,0 +1,133 @@
+/*
+	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 FakeToot = require("../../components/fake-toot");
+const MutateButton = require("../../components/mutation-button");
+
+const { 
+	useTextInput,
+	useFileInput
+} = require("../../components/form");
+
+const query = require("../../lib/query");
+
+module.exports = function NewEmojiForm({emoji}) {
+	const emojiCodes = React.useMemo(() => {
+		return new Set(emoji.map((e) => e.shortcode));
+	}, [emoji]);
+
+	const [addEmoji, result] = query.useAddEmojiMutation();
+
+	const [onFileChange, resetFile, {image, imageURL, imageInfo}] = useFileInput("image", {
+		withPreview: true,
+		maxSize: 50 * 1024
+	});
+
+	const [onShortcodeChange, resetShortcode, {shortcode, setShortcode, shortcodeRef}] = useTextInput("shortcode", {
+		validator: function validateShortcode(code) {
+			return emojiCodes.has(code)
+				? "Shortcode already in use"
+				: "";
+		}
+	});
+
+	React.useEffect(() => {
+		if (shortcode.length == 0) {
+			if (image != undefined) {
+				let [name, _ext] = image.name.split(".");
+				setShortcode(name);
+			}
+		}
+		// eslint-disable-next-line react-hooks/exhaustive-deps
+	}, [image]);
+
+	function uploadEmoji(e) {
+		if (e) {
+			e.preventDefault();
+		}
+
+		Promise.try(() => {
+			return addEmoji({
+				image,
+				shortcode
+			});
+		}).then(() => {
+			resetFile();
+			resetShortcode();
+		});
+	}
+
+	let emojiOrShortcode = `:${shortcode}:`;
+
+	if (imageURL != undefined) {
+		emojiOrShortcode = <img
+			className="emoji"
+			src={imageURL}
+			title={`:${shortcode}:`}
+			alt={shortcode}
+		/>;
+	}
+
+	return (
+		<div>
+			<h2>Add new custom emoji</h2>
+
+			<FakeToot>
+				Look at this new custom emoji {emojiOrShortcode} isn&apos;t it cool?
+			</FakeToot>
+
+			<form onSubmit={uploadEmoji} className="form-flex">
+				<div className="form-field file">
+					<label className="file-input button" htmlFor="image">
+						Browse
+					</label>
+					{imageInfo}
+					<input
+						className="hidden"
+						type="file"
+						id="image"
+						name="Image"
+						accept="image/png,image/gif"
+						onChange={onFileChange}
+					/>
+				</div>
+
+				<div className="form-field text">
+					<label htmlFor="shortcode">
+						Shortcode, must be unique among the instance's local emoji
+					</label>
+					<input
+						type="text"
+						id="shortcode"
+						name="Shortcode"
+						ref={shortcodeRef}
+						onChange={onShortcodeChange}
+						value={shortcode}
+					/>
+				</div>
+				
+				<MutateButton text="Upload emoji" result={result}/>
+			</form>
+		</div>
+	);
+};