Updated auth config

src/app/auth/auth.service.ts

@@ -0,0 +1,86 @@
+import {Inject, Injectable, PLATFORM_ID} from '@angular/core';
+import {HttpClient} from '@angular/common/http';
+import {Observable} from 'rxjs';
+import {environment} from "../../environments/environment";
+import {isPlatformBrowser} from "@angular/common";
+import {jwtDecode, JwtPayload} from "jwt-decode";
+
+@Injectable({
+  providedIn: 'root'
+})
+export class AuthService {
+
+  private readonly authUrl: string
+
+  constructor(private http: HttpClient,
+              @Inject(PLATFORM_ID) private platformId: Object) {
+    this.authUrl = `${environment.backendUrl}/api/auth`;
+  }
+
+  private get isBrowser(): boolean {
+    return isPlatformBrowser(this.platformId);
+  }
+
+  isLoggedIn(): boolean {
+    if (!this.isBrowser) return false;
+    return sessionStorage.getItem("app.token") != null;
+  }
+
+  login(username: string, password: string): Observable<string> {
+    if (!this.isBrowser) {
+      throw new Error('Login can only be performed in browser');
+    }
+
+    const credentials = btoa(`${username}:${password}`);
+
+    const httpOptions = {
+      headers: {
+        'Authorization': `Basic ${credentials}`,
+        'Content-Type': 'application/json'
+      },
+      responseType: 'text' as 'text',
+    };
+    return this.http.post(this.authUrl, null, httpOptions);
+  }
+
+  logout() {
+    if (!this.isBrowser) return;
+    sessionStorage.removeItem("app.token");
+    sessionStorage.removeItem("app.roles");
+  }
+
+  isUserInRole(roleFromRoute: string) {
+    if (!this.isBrowser) return false;
+
+    const roles = sessionStorage.getItem("app.roles");
+
+    if (roles!.includes(",")) {
+      if (roles === roleFromRoute) {
+        return true;
+      }
+    } else {
+      const roleArray = roles!.split(",");
+      for (let role of roleArray) {
+        if (role === roleFromRoute) {
+          return true;
+        }
+      }
+    }
+    return false;
+  }
+
+  getUsername(): string | null {
+    if (!this.isBrowser) return null;
+
+    const token = sessionStorage.getItem("app.token");
+    if (!token) return null;
+
+    try {
+      const decodedToken = jwtDecode<JwtPayload>(token);
+      return decodedToken.sub || null;  // 'sub' is the standard JWT claim for subject/username
+    } catch (error) {
+      console.error('Error decoding token:', error);
+      return null;
+    }
+  }
+}