[frontend] Restructure Frontend Sources (#634)

* 🐸restructure frontend stuff, include admin and future user panel in main repo, properly deduplicate bundles for css+js across uses

* rename bundled to dist, caught by gitignore

* re-include status.css for profile template

* default to localhost

* serve frontend panels

* add todo message for abstraction

* refactor oauth registration flow

* oauth restructure

* update footer template

* change panel routes

* remove superfluous css imports

* write bundle to disk from test server, use forked budo-express

* wrap all page content in container

for robustness with addons etc injection other elements in body

* update documentation, goreleaser, Dockerfile

* update template meta tags

* add AGPL-3.0+ license header everywhere

* only attach update listener on EventEmitter

* cleaner config for various frontend bundles

* fix bundler script paths

* Merge commit 'd191931932b9293ce1be44ed08a1e69b9fcc1e25'

* fix up dockerfile, goreleaser

* go mod tidy

* add uglifyify

* move status hide/show js to frontend bundle

* fix stylesheet color( func regressions

* update contributing docs for new build path

* update goreleaser + docker building

* resolve dependency paths properly

* update package name

* use api errorhandler

Co-authored-by: tsmethurst <tobi.smethurst@protonmail.com>

web/source/panels/admin/auth.js

@@ -0,0 +1,96 @@
+/*
+   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 oauthLib = require("../../lib/oauth");
+
+module.exports = function Auth({setOauth}) {
+	const [ instance, setInstance ] = React.useState("");
+
+	React.useEffect(() => {
+		let isStillMounted = true;
+		// check if current domain runs an instance
+		let thisUrl = new URL(window.location.origin);
+		thisUrl.pathname = "/api/v1/instance";
+		Promise.try(() => {
+			return fetch(thisUrl.href);
+		}).then((res) => {
+			if (res.status == 200) {
+				return res.json();
+			}
+		}).then((json) => {
+			if (json && json.uri && isStillMounted) {
+				setInstance(json.uri);
+			}
+		}).catch((e) => {
+			console.log("error checking instance response:", e);
+		});
+
+		return () => {
+			// cleanup function
+			isStillMounted = false;
+		};
+	}, []);
+
+	function doAuth() {
+		return Promise.try(() => {
+			return new URL(instance);
+		}).catch(TypeError, () => {
+			return new URL(`https://${instance}`);
+		}).then((parsedURL) => {
+			let url = parsedURL.toString();
+			let oauth = oauthLib({
+				instance: url,
+				client_name: "GoToSocial Admin Panel",
+				scope: ["admin"],
+				website: window.location.href
+			});
+			setOauth(oauth);
+			setInstance(url);
+			return oauth.register().then(() => {
+				return oauth;
+			});
+		}).then((oauth) => {
+			return oauth.authorize();
+		}).catch((e) => {
+			console.log("error authenticating:", e);
+		});
+	}
+
+	function updateInstance(e) {
+		if (e.key == "Enter") {
+			doAuth();
+		} else {
+			setInstance(e.target.value);
+		}
+	}
+
+	return (
+		<section className="login">
+			<h1>OAUTH Login:</h1>
+			<form onSubmit={(e) => e.preventDefault()}>
+				<label htmlFor="instance">Instance: </label>
+				<input value={instance} onChange={updateInstance} id="instance"/>
+				<button onClick={doAuth}>Authenticate</button>
+			</form>
+		</section>
+	);
+};