[feature] Application creation + management via API + settings panel (#3906)

* [feature] Application creation + management via API + settings panel

* fix docs links

* add errnorows test

* use known application as shorter

* add comment about side effects

web/source/settings/views/user/applications/common.tsx

@@ -0,0 +1,85 @@
+/*
+	GoToSocial
+	Copyright (C) GoToSocial Authors admin@gotosocial.org
+	SPDX-License-Identifier: AGPL-3.0-or-later
+
+	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/>.
+*/
+
+import React, { useMemo } from "react";
+import { App } from "../../../lib/types/application";
+import { useStore } from "react-redux";
+import { RootState } from "../../../redux/store";
+
+export const useAppWebsite = (app: App) => {
+	return useMemo(() => {
+		if (!app.website) {
+			return "";
+		}
+    
+		try {
+			// Try to parse nicely and return link.
+			const websiteURL = new URL(app.website);
+			const websiteURLStr = websiteURL.toString();
+			return (
+				<a
+					href={websiteURLStr}
+					target="_blank"
+					rel="nofollow noreferrer noopener"
+				>{websiteURLStr}</a>
+			);
+		} catch {
+			// Fall back to returning string.
+			return app.website;
+		}
+	}, [app.website]);
+};
+
+export const useCreated = (app: App) => {
+	return useMemo(() => {
+		const createdAt = new Date(app.created_at);
+		return <time dateTime={app.created_at}>{createdAt.toDateString()}</time>;
+	}, [app.created_at]);
+};
+
+export const useRedirectURIs= (app: App) => {
+	return useMemo(() => {
+		const length = app.redirect_uris.length;
+		if (length === 1)  {
+			return app.redirect_uris[0];
+		}
+    
+		return app.redirect_uris.map((redirectURI, i) => {
+			return i === 0 ? <>{redirectURI}</> : <><br/>{redirectURI}</>;
+		});
+    
+	}, [app.redirect_uris]);
+};
+
+export const useCallbackURL = () => {
+	const state = useStore().getState() as RootState;
+	const instanceUrl = state.login.instanceUrl;
+	if (instanceUrl === undefined) {
+		throw "instanceUrl undefined";
+	}
+
+	return useMemo(() => {
+		const url = new URL(instanceUrl);
+		if (url === null) {
+			throw "redirectURI null";
+		}
+		url.pathname = "/settings/user/applications/callback";
+		return url.toString(); 
+	}, [instanceUrl]);
+};