[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/redux/login.ts

@@ -0,0 +1,69 @@
+/*
+	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 { PayloadAction, createSlice } from "@reduxjs/toolkit";
+import { OAuthApp, OAuthAccessToken } from "../lib/types/oauth";
+
+export interface LoginState {
+	instanceUrl?: string;
+	current: "none" | "awaitingcallback" | "loggedin" | "loggedout";
+	expectingRedirect: boolean;
+	/**
+	 * Token stored in easy-to-use format.
+	 * Will look something like:
+	 * "Authorization: Bearer BLAHBLAHBLAH"
+	 */
+	token?: string;
+	app?: OAuthApp;
+}
+
+const initialState: LoginState = {
+	current: 'none',
+	expectingRedirect: false,
+};
+
+export const loginSlice = createSlice({
+	name: "login",
+	initialState: initialState,
+	reducers: {
+		authorize: (_state, action: PayloadAction<LoginState>) => {
+			// Overrides state with payload.
+			return action.payload;
+		},
+		setToken: (state, action: PayloadAction<OAuthAccessToken>) => {
+			// Mark us as logged
+			// in by storing token.
+			state.token = `${action.payload.token_type} ${action.payload.access_token}`;
+			state.current = "loggedin";
+		},
+		remove: (state) => {
+			// Mark us as logged
+			// out by clearing auth.
+			delete state.token;
+			delete state.app;
+			state.current = "loggedout";
+		}
+	}
+});
+
+export const {
+	authorize,
+	setToken,
+	remove,
+} = loginSlice.actions;