[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

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

@@ -0,0 +1,168 @@
+/*
+	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,
+	useComboBoxInput
+} = require("../../../components/form");
+
+const query = require("../../../lib/query");
+const { CategorySelect } = require('../category-select');
+
+const shortcodeRegex = /^[a-z0-9_]+$/;
+
+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) {
+			// 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 "";
+		}
+	});
+
+	const [categoryState, resetCategory, { category }] = useComboBoxInput("category");
+
+	React.useEffect(() => {
+		if (shortcode.length == 0) {
+			if (image != undefined) {
+				let [name, _ext] = image.name.split(".");
+				setShortcode(name);
+			}
+		}
+		// we explicitly don't want to add 'shortcode' as a dependency here
+		// because we only want this to update to the filename if the field is empty
+		// at the moment the file is selected, not some time after when the field is emptied
+		// eslint-disable-next-line react-hooks/exhaustive-deps
+	}, [image]);
+
+	function uploadEmoji(e) {
+		if (e) {
+			e.preventDefault();
+		}
+
+		Promise.try(() => {
+			return addEmoji({
+				image,
+				shortcode,
+				category
+			}).unwrap();
+		}).then(() => {
+			resetFile();
+			resetShortcode();
+			resetCategory();
+		}).catch((e) => {
+			console.error("Emoji upload error:", e);
+		});
+	}
+
+	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>
+
+				<CategorySelect
+					value={category}
+					categoryState={categoryState}
+				/>
+
+				<MutateButton text="Upload emoji" result={result} />
+			</form>
+		</div>
+	);
+};