Refactoring, adding some login logic stuff

src/app/services/api.service.ts

@@ -0,0 +1,13 @@
+import {User} from '../models/user';
+
+export class ApiService {
+	static apiUrl = 'https://api.plutodev.de/fbcards/';
+
+	/**
+	 * Sends user info to API to retrieve a session key.
+	 * @param user
+	 */
+	static performAuthentication(user: User): User {
+		return user;
+	}
+}

src/app/services/storage.service.ts

@@ -1,7 +1,11 @@
 import {User} from '../models/user';
 
 export class StorageService {
-	getUserInfo(): User {
+	static getUserInfo(): User | undefined {
+		if(localStorage.getItem('user_loggedIn') !== '1') {
+			return undefined;
+		}
+
 		const firebonkId = parseInt((localStorage.getItem('user_firebonkId') ?? '-1'), 10);
 		const uuid = localStorage.getItem('user_uuid') ?? '';
 		const firstName = localStorage.getItem('user_firstName') ?? '';
@@ -17,7 +21,8 @@ export class StorageService {
 		};
 	}
 
-	setUserInfo(user: User): void {
+	static setUserInfo(user: User): void {
+		localStorage.setItem('user_loggedIn', '1');
 		localStorage.setItem('user_firebonkId', String(user.firebonkId));
 		localStorage.setItem('user_uuid', String(user.uuid));
 		localStorage.setItem('user_firstName', String(user.firstName));