verdnatura-chat/app/sagas/init.js

import { put, takeLatest } from 'redux-saga/effects';
import RNBootSplash from 'react-native-bootsplash';

import UserPreferences from '../lib/userPreferences';
import { selectServerRequest } from '../actions/server';
import { setAllPreferences } from '../actions/sortPreferences';
import { APP } from '../actions/actionsTypes';
import RocketChat from '../lib/rocketchat';
import log from '../utils/log';
import database from '../lib/database';
import { localAuthenticate } from '../utils/localAuthentication';
import { appStart, ROOT_OUTSIDE, appReady } from '../actions/app';

export const initLocalSettings = function* initLocalSettings() {
	const sortPreferences = yield RocketChat.getSortPreferences();
	yield put(setAllPreferences(sortPreferences));
};

const restore = function* restore() {
	try {
		const server = yield UserPreferences.getStringAsync(RocketChat.CURRENT_SERVER);
		let userId = yield UserPreferences.getStringAsync(`${ RocketChat.TOKEN_KEY }-${ server }`);

		if (!server) {
			yield put(appStart({ root: ROOT_OUTSIDE }));
		} else if (!userId) {
			const serversDB = database.servers;
			const serversCollection = serversDB.get('servers');
			const servers = yield serversCollection.query().fetch();

			// Check if there're other logged in servers and picks first one
			if (servers.length > 0) {
				for (let i = 0; i < servers.length; i += 1) {
					const newServer = servers[i].id;
					userId = yield UserPreferences.getStringAsync(`${ RocketChat.TOKEN_KEY }-${ newServer }`);
					if (userId) {
						return yield put(selectServerRequest(newServer));
					}
				}
			}
			yield put(appStart({ root: ROOT_OUTSIDE }));
		} else {
			const serversDB = database.servers;
			const serverCollections = serversDB.get('servers');

			let serverObj;
			try {
				yield localAuthenticate(server);
				serverObj = yield serverCollections.find(server);
			} catch {
				// Server not found
			}
			yield put(selectServerRequest(server, serverObj && serverObj.version));
		}

		yield put(appReady({}));
	} catch (e) {
		log(e);
		yield put(appStart({ root: ROOT_OUTSIDE }));
	}
};

const start = function* start() {
	yield RNBootSplash.hide();
};

const root = function* root() {
	yield takeLatest(APP.INIT, restore);
	yield takeLatest(APP.START, start);
	yield takeLatest(APP.INIT_LOCAL_SETTINGS, initLocalSettings);
};
export default root;