[chore] Bundler restructure (#880)

* re-structure bundler, settings panel files

* add more info logging

* tidy up CSS syntax errors

* split into lib/ files

* livereloading server

* fix factor function for production builds

* remove testing console.log

* default to production env, saves 300kb bundle size

1 files changed, 134 insertions, 0 deletions

diff --git a/web/source/settings/lib/panel.js b/web/source/settings/lib/panel.js
new file mode 100644
index 000000000..df723bc74
--- /dev/null
+++ b/web/source/settings/lib/panel.js
@@ -0,0 +1,134 @@
+/*
+	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 ReactDom = require("react-dom");
+
+const oauthLib = require("./oauth");
+
+module.exports = function createPanel(clientName, scope, Component) {
+	ReactDom.render(<Panel/>, document.getElementById("root"));
+
+	function Panel() {
+		const [oauth, setOauth] = React.useState();
+		const [hasAuth, setAuth] = React.useState(false);
+		const [oauthState, setOauthState] = React.useState(localStorage.getItem("oauth"));
+
+		React.useEffect(() => {
+			let state = localStorage.getItem("oauth");
+			if (state != undefined) {
+				state = JSON.parse(state);
+				let restoredOauth = oauthLib(state.config, state);
+				Promise.try(() => {
+					return restoredOauth.callback();
+				}).then(() => {
+					setAuth(true);
+				});
+				setOauth(restoredOauth);
+			}
+		}, [setAuth, setOauth]);
+
+		if (!hasAuth && oauth && oauth.isAuthorized()) {
+			setAuth(true);
+		}
+
+		if (oauth && oauth.isAuthorized()) {
+			return <Component oauth={oauth} />;
+		} else if (oauthState != undefined) {
+			return "processing oauth...";
+		} else {
+			return <Auth setOauth={setOauth} />;
+		}
+	}
+
+	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: clientName,
+					scope: scope,
+					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>
+		);
+	}
+};
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