13 files changed, 1239 insertions, 0 deletions
diff --git a/src/app/services/auth.service.ts b/src/app/services/auth.service.ts
new file mode 100644
index 0000000..8988196
--- /dev/null
+++ b/src/app/services/auth.service.ts
@@ -0,0 +1,94 @@
+/*
+ * Copyright (c) 2022. Deutsche Telekom AG
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+
+import { Injectable } from '@angular/core';
+import { OAuthService, UserInfo } from 'angular-oauth2-oidc';
+import { catchError, filter, map } from 'rxjs/operators';
+import { NavigationStart, Router } from '@angular/router';
+import { AlertService } from '../modules/alerting';
+import { TranslateService } from '@ngx-translate/core';
+import { BehaviorSubject, EMPTY, Observable, of } from 'rxjs';
+
+/**
+ * Provides check for roles and token
+ */
+@Injectable({
+  providedIn: 'root',
+})
+export class AuthService {
+  userProfile$ = new BehaviorSubject<UserInfo | undefined>(undefined);
+  constructor(private readonly oauthService: OAuthService, private router: Router, private alertService: AlertService, private translateService: TranslateService) {
+    //renew cache every page reload
+    router.events.pipe(
+      filter((e): e is NavigationStart => e instanceof NavigationStart)
+    ).subscribe(() => {
+      try {
+        return this.loadUserProfile().then(userInfo => this.userProfile$.next(userInfo)).catch(e => {throw e})
+      }catch (e) {
+        this.alertService.error(this.translateService.instant('common.messages.keycloakAccessTokenNotValid'), {id: "keycloak", keepAfterRouteChange: true})
+        return Promise.resolve(null);
+      }
+    });
+  }
+
+  userProfileCache: UserInfo | undefined = undefined;
+
+  /**
+   * Convenience method of `hasValidAccessToken()` and `hasSufficientRoles()`
+   * Asynchronous because the needed UserInfo is fetched from Keycloak
+   */
+  hasPermissions(): Observable<boolean> {
+    if (this.hasValidAccessToken()) {
+      return this.hasSufficientRoles();
+    }
+    return of(false);
+  }
+
+  /**
+   * This answers: 'What if the user has an account, but without any permissions?'
+   * Asynchronous because the needed UserInfo is fetched from Keycloak
+   */
+  hasSufficientRoles(): Observable<boolean> {
+    return this.loadCachedUserProfile().pipe(map(info => info?.roles.join(',') !== 'offline_access'));
+  }
+
+  loadCachedUserProfile(): Observable<UserInfo | undefined> {
+    return this.userProfile$.pipe(
+      filter(userProfile => userProfile !== undefined),
+      catchError(err => {
+        console.error(err);
+        return EMPTY
+      }));
+  }
+
+  /**
+   * Wrapper for `hasValidAccessToken` from OAuthService
+   */
+  hasValidAccessToken(): boolean {
+    return this.oauthService.hasValidAccessToken();
+  }
+  /*
+  * Private method = should not be used outside of this class, because it triggers additional request for userprofile
+  * */
+  private loadUserProfile():Promise<UserInfo> {
+    // in version 12.2 loadUserProfile() Promise returns data of type object instead of UserInfo
+    //@ts-ignore
+    return this.oauthService.loadUserProfile().then(userInfo => userInfo.info as UserInfo)
+  }
+}
diff --git a/src/app/services/authconfig.service.ts b/src/app/services/authconfig.service.ts
new file mode 100644
index 0000000..5ced9a1
--- /dev/null
+++ b/src/app/services/authconfig.service.ts
@@ -0,0 +1,47 @@
+/*
+ * Copyright (c) 2022. Deutsche Telekom AG
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+
+import { Injectable } from '@angular/core';
+import { AuthConfig, NullValidationHandler, OAuthService } from 'angular-oauth2-oidc';
+
+@Injectable()
+export class AuthConfigService {
+  constructor(private readonly oauthService: OAuthService, private readonly authConfig: AuthConfig) {}
+
+  async initAuth(): Promise<any> {
+    return new Promise<void>((resolveFn, rejectFn) => {
+      // setup oauthService
+      this.oauthService.configure(this.authConfig);
+      this.oauthService.tokenValidationHandler = new NullValidationHandler();
+
+      this.oauthService.loadDiscoveryDocumentAndLogin().then(isLoggedIn => {
+        if (isLoggedIn) {
+          this.oauthService.setupAutomaticSilentRefresh();
+          resolveFn();
+        } else {
+          this.oauthService.initImplicitFlow();
+          rejectFn();
+        }
+      }).catch(() => {
+        //@ts-ignore
+        window.location.href = './keycloak-error.html'
+      });
+    });
+  }
+}
diff --git a/src/app/services/cacheservice/request-cache.service.spec.ts b/src/app/services/cacheservice/request-cache.service.spec.ts
new file mode 100644
index 0000000..c9f931e
--- /dev/null
+++ b/src/app/services/cacheservice/request-cache.service.spec.ts
@@ -0,0 +1,35 @@
+/*
+ * Copyright (c) 2022. Deutsche Telekom AG
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+
+import { TestBed } from '@angular/core/testing';
+
+import { RequestCacheService } from './request-cache.service';
+
+describe('RequestCacheService', () => {
+  let service: RequestCacheService;
+
+  beforeEach(() => {
+    TestBed.configureTestingModule({});
+    service = TestBed.inject(RequestCacheService);
+  });
+
+  it('should be created', () => {
+    expect(service).toBeTruthy();
+  });
+});
diff --git a/src/app/services/cacheservice/request-cache.service.ts b/src/app/services/cacheservice/request-cache.service.ts
new file mode 100644
index 0000000..3d2047f
--- /dev/null
+++ b/src/app/services/cacheservice/request-cache.service.ts
@@ -0,0 +1,89 @@
+/*
+ * Copyright (c) 2022. Deutsche Telekom AG
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+
+import { HttpRequest, HttpResponse } from '@angular/common/http';
+import { Injectable } from '@angular/core';
+
+const maxAge = 60000;
+
+@Injectable({
+  providedIn: 'root',
+})
+// https://github.com/angular/angular/blob/master/aio/content/examples/http/src/app/request-cache.service.ts
+export class RequestCacheService implements RequestCache {
+  // The cache is a Map of (most importantly but not exclusively) HttpResponses
+  cache = new Map<string, RequestCacheEntry>();
+
+  /**
+   * Get an http request from cache
+   * @param request the http request that should be retrieved from cache
+   */
+  get(request: HttpRequest<any>): HttpResponse<any> | undefined {
+    const requestUrl = request.urlWithParams;
+    const cachedResponse = this.cache.get(requestUrl);
+
+    if (!cachedResponse) {
+      return undefined;
+    }
+
+    const isExpired = cachedResponse.lastRead < Date.now() - maxAge;
+
+
+    return isExpired ? undefined : cachedResponse.response;
+  }
+
+  /**
+   * Put a http response for a given request url (taken from the request object) in the cache
+   * @param request the http request that should be associated with the http response
+   * @param response the http response that should be stored in cache
+   */
+  put(request: HttpRequest<any>, response: HttpResponse<any>): void {
+    const requestUrl = request.urlWithParams;
+
+    // Map a request url to an object
+    const newEntry = { requestUrl, response, lastRead: Date.now() };
+    this.cache.set(requestUrl, newEntry);
+
+    // Remove expired entries from the cache
+    const expired = Date.now() - maxAge;
+    this.cache.forEach(entry => {
+      if (entry.lastRead < expired) {
+        this.cache.delete(entry.requestUrl);
+      }
+    });
+  }
+}
+
+/**
+ * Service that manages the cache.
+ * `get()` HttpResponses from cache and `put()` responses into the cache
+ */
+export abstract class RequestCache {
+  abstract get(request: HttpRequest<any>): HttpResponse<any> | undefined;
+  abstract put(request: HttpRequest<any>, response: HttpResponse<any>): void;
+}
+
+/**
+ * Wrapper Object that stores the HttpResponse together with the `requestUrl` of the request and the `lastRead` time it was cached
+ */
+export interface RequestCacheEntry {
+  requestUrl: string;
+  response: HttpResponse<any>;
+  lastRead: number;
+}
diff --git a/src/app/services/fullscreen.service.ts b/src/app/services/fullscreen.service.ts
new file mode 100644
index 0000000..91ceec9
--- /dev/null
+++ b/src/app/services/fullscreen.service.ts
@@ -0,0 +1,58 @@
+/*
+ * Copyright (c) 2022. Deutsche Telekom AG
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+
+import { Injectable } from '@angular/core';
+
+@Injectable({
+  providedIn: 'root',
+})
+export class FullscreenService {
+  private doc = <FullScreenDocument>document;
+
+  enter() {
+    const el = this.doc.documentElement;
+    if (el.requestFullscreen) el.requestFullscreen();
+    else if (el.msRequestFullscreen) el.msRequestFullscreen();
+    else if (el.mozRequestFullScreen) el.mozRequestFullScreen();
+    else if (el.webkitRequestFullscreen) el.webkitRequestFullscreen();
+  }
+
+  leave() {
+    if (this.doc.exitFullscreen) this.doc.exitFullscreen();
+    else if (this.doc.msExitFullscreen) this.doc.msExitFullscreen();
+    else if (this.doc.mozCancelFullScreen) this.doc.mozCancelFullScreen();
+    else if (this.doc.webkitExitFullscreen) this.doc.webkitExitFullscreen();
+  }
+}
+
+interface FullScreenDocument extends HTMLDocument {
+  documentElement: FullScreenDocumentElement;
+  mozFullScreenElement?: Element;
+  msFullscreenElement?: Element;
+  webkitFullscreenElement?: Element;
+  msExitFullscreen?: () => void;
+  mozCancelFullScreen?: () => void;
+  webkitExitFullscreen?: () => void;
+}
+
+interface FullScreenDocumentElement extends HTMLElement {
+  msRequestFullscreen?: () => void;
+  mozRequestFullScreen?: () => void;
+  webkitRequestFullscreen?: () => void;
+}
diff --git a/src/app/services/history.service.ts b/src/app/services/history.service.ts
new file mode 100644
index 0000000..2924f39
--- /dev/null
+++ b/src/app/services/history.service.ts
@@ -0,0 +1,67 @@
+/*
+ * Copyright (c) 2022. Deutsche Telekom AG
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+
+import { Injectable } from '@angular/core';
+import {
+  ActionType,
+  CreateActionModel,
+  EntityType,
+  EntityUserHistoryActionModel,
+} from '../model/user-last-action.model';
+import { ActionsListResponse, ActionsResponse, ActionsService } from '../../../openapi/output';
+import { OAuthService } from 'angular-oauth2-oidc';
+import { Observable } from 'rxjs';
+
+@Injectable({
+  providedIn: 'root',
+})
+export class HistoryService {
+  constructor(private readonly actionService: ActionsService, private readonly oauthService: OAuthService) {}
+
+  public getUserActions(interval: number | undefined): Observable<ActionsListResponse> {
+    const userId = Object(this.oauthService.getIdentityClaims()).sub;
+    return this.actionService.getActions(userId, 1, 1000, interval);
+  }
+
+  public createUserHistoryAction(action: CreateActionModel<EntityUserHistoryActionModel>): Observable<ActionsResponse> {
+    let mappedAction = {
+      type: action.type,
+      entity: action.entity,
+      entityParams: {
+        userName: action.entityParams.userName,
+        userId: action.entityParams.userId,
+      },
+    };
+    return this.createAction(mappedAction);
+  }
+
+  private createAction(action: {
+    type: ActionType;
+    entity: EntityType;
+    entityParams: { [key: string]: string | undefined};
+  }): Observable<ActionsResponse> {
+    const userId = Object(this.oauthService.getIdentityClaims()).sub;
+    const actionCreatedAt = new Date().toISOString();
+    return this.actionService.createAction(userId, undefined, {
+      userId,
+      actionCreatedAt,
+      action,
+    });
+  }
+}
diff --git a/src/app/services/loading-indicator.service.ts b/src/app/services/loading-indicator.service.ts
new file mode 100644
index 0000000..727edd4
--- /dev/null
+++ b/src/app/services/loading-indicator.service.ts
@@ -0,0 +1,47 @@
+/*
+ * Copyright (c) 2022. Deutsche Telekom AG
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+
+import { Injectable } from '@angular/core';
+import { BehaviorSubject, Observable } from 'rxjs';
+import { debounceTime } from 'rxjs/operators';
+
+@Injectable()
+export class LoadingIndicatorService {
+  private isVisible$ = new BehaviorSubject<boolean>(false);
+  private timeDelay = 500;
+  private counter = 0;
+
+  show(): void {
+    this.counter++;
+    if (this.counter > 0) {
+      setTimeout(() => this.isVisible$.next(true), 0);
+    }
+  }
+
+  hide(): void {
+    this.counter--;
+    if (this.counter === 0) {
+      setTimeout(() => this.isVisible$.next(false), 0);
+    }
+  }
+
+  isVisible(): Observable<boolean> {
+    return this.isVisible$.pipe(debounceTime(this.timeDelay));
+  }
+}
diff --git a/src/app/services/logging.service.ts b/src/app/services/logging.service.ts
new file mode 100644
index 0000000..5250fda
--- /dev/null
+++ b/src/app/services/logging.service.ts
@@ -0,0 +1,34 @@
+/*
+ * Copyright (c) 2022. Deutsche Telekom AG
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+
+import { Injectable } from '@angular/core';
+import { HttpClient } from '@angular/common/http';
+import { Observable } from 'rxjs';
+import { environment } from '../../environments/environment';
+
+@Injectable({
+  providedIn: 'root',
+})
+export class LoggingService {
+  constructor(private readonly httpClient: HttpClient) {}
+
+  writeLog(message: string): Observable<string> {
+    return this.httpClient.post(environment.loggingUrl, message, { responseType: 'text' });
+  }
+}
diff --git a/src/app/services/shortcut.service.ts b/src/app/services/shortcut.service.ts
new file mode 100644
index 0000000..750ab5b
--- /dev/null
+++ b/src/app/services/shortcut.service.ts
@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 2022. Deutsche Telekom AG
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import { Injectable } from '@angular/core';
+import { TranslateService } from '@ngx-translate/core';
+
+export enum KeyboardShortcuts {
+  SHORTCUT_0 = '0',
+  SHORTCUT_1 = '1',
+  SHORTCUT_2 = '2',
+  SHORTCUT_4 = '4',
+  SHORTCUT_6 = '6',
+}
+
+@Injectable({
+  providedIn: 'root'
+})
+
+export class ShortcutService {
+
+  private shortcuts = new Map<KeyboardShortcuts, string>([
+    [KeyboardShortcuts.SHORTCUT_0, this.translateService.instant('layout.header.shortcuts.details')],
+    [KeyboardShortcuts.SHORTCUT_1, this.translateService.instant('layout.header.shortcuts.home')],
+    [KeyboardShortcuts.SHORTCUT_2, this.translateService.instant('layout.header.shortcuts.main')],
+    [KeyboardShortcuts.SHORTCUT_4, this.translateService.instant('layout.header.shortcuts.search')],
+    [KeyboardShortcuts.SHORTCUT_6, this.translateService.instant('layout.header.shortcuts.menu')],
+  ]);
+
+  constructor(private translateService: TranslateService) { }
+
+  public getShortcuts(): Map<KeyboardShortcuts,string> {
+    return this.shortcuts;
+  }
+}
diff --git a/src/app/services/tileservice/tiles.service.spec.ts b/src/app/services/tileservice/tiles.service.spec.ts
new file mode 100644
index 0000000..f7f4369
--- /dev/null
+++ b/src/app/services/tileservice/tiles.service.spec.ts
@@ -0,0 +1,488 @@
+/*
+ * Copyright (c) 2022. Deutsche Telekom AG
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+
+import { TestBed, waitForAsync } from '@angular/core/testing';
+import { Tile } from '../../model/tile';
+import { TilesService } from './tiles.service';
+import { HttpErrorResponse } from '@angular/common/http';
+import { HttpClientTestingModule, HttpTestingController } from '@angular/common/http/testing';
+import { environment } from '../../../environments/environment';
+import { OAuthLogger, OAuthService, UrlHelperService } from 'angular-oauth2-oidc';
+
+// https://dev.to/coly010/unit-testing-angular-services-1anm
+
+/**
+ * describe sets up the Test Suite for the TileService
+ */
+describe('TilesService', () => {
+  /**
+   * let service declares a Test Suite-scoped variable where we will store a reference to our service
+   */
+  let service: TilesService;
+  let mockTile: Tile;
+  let httpmock: HttpTestingController;
+  let errmsg: string;
+
+  const backendServerUrlTest = environment.backendServerUrl + '/tiles';
+  /**
+   * beforeEach tells the test runner to run this code before every test in the Test Suite
+   * It is using Angular's TestBed to create the testing environment. Finally it is injecting the TilesService
+   * and placing a reference to it in the service variable defined earlier.
+   */
+  beforeEach(() => {
+    TestBed.configureTestingModule({
+      imports: [HttpClientTestingModule],
+      providers: [TilesService, OAuthService, UrlHelperService, OAuthLogger],
+    });
+    service = TestBed.inject(TilesService);
+    httpmock = TestBed.inject(HttpTestingController);
+    mockTile = {
+      id: 1,
+      title: 'NewTile1',
+      description: 'New Tile for frontend test',
+      imageUrl: 'https://www.onap.org/wp-content/uploads/sites/20/2017/02/logo_onap_2017.png',
+      imageAltText: 'Onap Image',
+      redirectUrl: 'www.onap.org',
+      headers: 'This is a header',
+      groups: [],
+      roles: [],
+    };
+    // responseTile = {
+    //   id: 2,
+    //   title: 'NewTile1',
+    //   description: 'New Tile for frontend test',
+    //   imageUrl: 'https://www.onap.org/wp-content/uploads/sites/20/2017/02/logo_onap_2017.png',
+    //   imageAltText: 'Onap Image',
+    //   redirectUrl: 'www.onap.org',
+    //   headers: 'This is a header',
+    //   groups: [],
+    //   roles: [],
+    // };
+  });
+
+  /**
+   * After every test, assert that there are no more pending requests.
+   */
+  afterEach(() => {
+    httpmock.verify();
+  });
+
+  /**
+   * the it() function creates a new test with the title 'should be created'
+   * This test is expecting the service varibale to truthy, in otherwords,
+   * it should have been instantiated correctly by the Angular TestBed.
+   */
+  it('should be created', () => {
+    expect(service).toBeTruthy();
+  });
+
+  /**
+   * TileService method tests begin
+   * Testing getTiles
+   */
+  describe('#getTiles', () => {
+    // let expectedTiles: Tile[];
+
+    beforeEach(() => {
+      // expectedTiles = [mockTile, responseTile];
+    });
+
+    /**
+     * testing method getTiles() to get all existing tiles
+     */
+    /*
+    it('should return expected tiles (called once)', (done: DoneFn) => {
+      service.getTiles().subscribe(response => {
+        expect(response).toEqual(expectedTiles, 'should return expected tiles');
+        // done() to be called after asynchronous calls (https://angular.io/guide/testing-services)
+        done();
+      });
+
+      // TileService should have made one request to GET tiles from expected URL
+      const req = httpmock.expectOne(backendServerUrlTest);
+      expect(req.request.method).toEqual('GET');
+
+      // Respond with the expected mock tiles
+      req.flush(expectedTiles);
+    });
+*/
+    /**
+     * TODO: Maybe it makes sense to inform the user that no tiles are displayed
+     * testing method getTiles() in case there are no tiles in the database
+     */
+    /*
+    it('should be OK returning no tiles', (done: DoneFn) => {
+      service.getTiles().subscribe(response => {
+        expect(response.length).toEqual(0, 'should have empty tiles array');
+        done();
+      });
+
+      const req = httpmock.expectOne(backendServerUrlTest);
+      expect(req.request.method).toEqual('GET');
+
+      req.flush([]); // Respond with no tile
+    });
+*/
+    /**
+     * testing method getTiles() in case the backend responds with 404 Not Found
+     * This service reports the error but finds a way to let the app keep going.
+     */
+
+    /*
+    it('should handle 404 error', (done: DoneFn) => {
+      errmsg = '404 error';
+
+      service.getTiles().subscribe(
+        response => fail('should fail with the 404 error'),
+        (err: HttpErrorResponse) => {
+          expect(err.status).toEqual(404);
+          expect(err.error).toEqual(errmsg);
+        },
+      );
+
+      // Make an HTTP Get Request
+      // service.getTiles().then(
+      //     response => fail('should have failed with the 404 error'),
+      //       (err: HttpErrorResponse) => {
+      //         expect(err.status).toEqual(404);
+      //         expect(err.error).toEqual(errmsg);
+      //       }
+      // );
+
+      const req = httpmock.expectOne(backendServerUrlTest);
+      expect(req.request.method).toEqual('GET');
+
+      // respond with a 404 and the error message in the body --> TODO Frontend GUI must react correctly
+      req.flush(errmsg, { status: 404, statusText: 'Not Found' });
+    });
+     */
+
+    /**
+     * testing getTiles() when method is called multiple times
+     * TODO: expect cached results
+     */
+    /*
+    it('should return expected tiles (called multiple times)', () => {
+      service.getTiles().subscribe();
+      service.getTiles().subscribe();
+      service.getTiles().subscribe(response => {
+        expect(response).toEqual(expectedTiles, 'should return expected tiles');
+      });
+
+      const req = httpmock.match(backendServerUrlTest);
+      expect(req.length).toEqual(3, 'calls to getTiles()');
+
+      // Respond to each request with different mock tile results
+      req[0].flush([]);
+      req[1].flush([mockTile]);
+      req[2].flush(expectedTiles);
+    });*/
+  });
+
+  /**
+   * Tests for getTileByID()
+   */
+  describe('#getTileByID', () => {
+    /**
+     * testing method getTilesById() to return the specific tile with right id
+     */
+    it('should return expected tile by id', () => {
+      service.getTileById(mockTile.id).then(response => {
+        expect(response).toEqual(mockTile, 'should return expected tile');
+      });
+
+      const req = httpmock.expectOne(backendServerUrlTest + '/' + mockTile.id);
+      expect(req.request.method).toEqual('GET');
+
+      // Respond with the mock tiles
+      req.flush(mockTile);
+    });
+
+    /**
+     * testing method getTileByID() in case the backend responds with 404 Not Found and the tile does not exist
+     */
+    it(
+      'getTileById(): should handle 404 error',
+      waitForAsync(() => {
+        errmsg = '404 error';
+        // Make an HTTP Get Request
+        service.getTileById(mockTile.id).then(
+          () => fail('should have failed with the 404 error'),
+          (err: HttpErrorResponse) => {
+            expect(err.status).toEqual(404);
+            expect(err.error).toEqual(errmsg);
+          },
+        );
+
+        const req = httpmock.expectOne(backendServerUrlTest + '/' + mockTile.id);
+        expect(req.request.method).toEqual('GET');
+
+        req.flush(errmsg, { status: 404, statusText: 'Not Found' });
+      }),
+    );
+  });
+  /**
+   * Tests for update an existing tile
+   */
+  describe('#updateTiles', () => {
+    /**
+     * testing method updateTiles()
+     */
+    it('should update a tile and return it', () => {
+      mockTile.title = 'Update title';
+
+      service.updateTiles(mockTile).then(response => {
+        expect(response.title).toEqual('Update title', 'should return tile');
+      });
+      // TileService should have made one request to PUT
+      const req = httpmock.expectOne(backendServerUrlTest + '/' + mockTile.id);
+      expect(req.request.method).toEqual('PUT');
+      expect(req.request.body).toEqual(mockTile);
+
+      req.flush(mockTile);
+    });
+
+    /**
+     * testing method updateTiles() in case the backend responds with 404 Not Found and the tile does not exist
+     */
+    it(
+      'updateTiles(): should handle 404 error',
+      waitForAsync(() => {
+        errmsg = '404 error';
+        // Make an HTTP Get Request
+        service.updateTiles(mockTile).then(
+          () => fail('should have failed with the 404 error'),
+          (err: HttpErrorResponse) => {
+            expect(err.status).toEqual(404);
+            expect(err.error).toEqual(errmsg);
+          },
+        );
+
+        const req = httpmock.expectOne(backendServerUrlTest + '/' + mockTile.id);
+        expect(req.request.method).toEqual('PUT');
+
+        req.flush(errmsg, { status: 404, statusText: 'Not Found' });
+      }),
+    );
+
+    /**
+     * testing method updateTiles() in case the backend responds with 401 Unauthorized
+     */
+    it(
+      'updateTiles(): should handle 401 error',
+      waitForAsync(() => {
+        errmsg = '401 error';
+        // Make an HTTP Get Request
+        service.updateTiles(mockTile).then(
+          () => fail('should have failed with the 401 error'),
+          (err: HttpErrorResponse) => {
+            expect(err.status).toEqual(401);
+            expect(err.error).toEqual(errmsg);
+          },
+        );
+
+        const req = httpmock.expectOne(backendServerUrlTest + '/' + mockTile.id);
+        expect(req.request.method).toEqual('PUT');
+
+        req.flush(errmsg, { status: 401, statusText: 'Not Found' });
+      }),
+    );
+
+    /**
+     * testing method updateTiles() in case the backend responds with 403 Forbidden
+     */
+    it(
+      'updateTiles(): should handle 403 error',
+      waitForAsync(() => {
+        errmsg = '403 error';
+        // Make an HTTP Get Request
+        service.updateTiles(mockTile).then(
+          () => fail('should have failed with the 404 error'),
+          (err: HttpErrorResponse) => {
+            expect(err.status).toEqual(403);
+          },
+        );
+
+        const req = httpmock.expectOne(backendServerUrlTest + '/' + mockTile.id);
+        expect(req.request.method).toEqual('PUT');
+
+        req.flush(errmsg, { status: 403, statusText: 'Not Found' });
+      }),
+    );
+  });
+  /*
+   *  Test save a new tile
+   */
+  describe('#saveTiles', () => {
+    /*
+     * testing saveTiles() to save a new tile
+     */
+    it(
+      'should save a tile correctly (mocked http post request)',
+      waitForAsync(() => {
+        service.saveTiles(mockTile).then(response => {
+          expect(response.id).toBe(1);
+          expect(response.title).toBe('NewTile1');
+          expect(response.redirectUrl).toBe('www.onap.org');
+          expect(response.imageAltText).toBe('Onap Image');
+          expect(response.imageUrl).toBe('https://www.onap.org/wp-content/uploads/sites/20/2017/02/logo_onap_2017.png');
+          expect(response.description).toBe('New Tile for frontend test');
+          expect(response.headers).toBe('This is a header');
+        });
+        /*
+         * Checking that there ist just one request and check the type of request
+         * 'flush'/ respond with mock data, run then-block in line 64 and check the except commands
+         */
+        const req = httpmock.expectOne(backendServerUrlTest);
+        expect(req.request.method).toEqual('POST');
+        req.flush(mockTile);
+      }),
+    );
+    /**
+     * testing method saveTiles() in case the backend answers with an 401 responds
+     */
+    it(
+      'saveTiles(): should handle 401 error',
+      waitForAsync(() => {
+        errmsg = '401 error';
+        // Make an HTTP Get Request
+        service.saveTiles(mockTile).then(
+          () => fail('should have failed with the 401 error'),
+          (err: HttpErrorResponse) => {
+            expect(err.status).toEqual(401);
+            expect(err.error).toEqual(errmsg);
+          },
+        );
+
+        const req = httpmock.expectOne(backendServerUrlTest);
+        expect(req.request.method).toEqual('POST');
+
+        req.flush(errmsg, { status: 401, statusText: 'Not Found' });
+      }),
+    );
+
+    it(
+      'saveTiles(): should handle 403 error',
+      waitForAsync(() => {
+        errmsg = '403 error';
+        // Make an HTTP Get Request
+        service.saveTiles(mockTile).then(
+          () => fail('should have failed with the 401 error'),
+          (err: HttpErrorResponse) => {
+            expect(err.status).toEqual(403);
+            expect(err.error).toEqual(errmsg);
+          },
+        );
+
+        const req = httpmock.expectOne(backendServerUrlTest);
+        expect(req.request.method).toEqual('POST');
+
+        req.flush(errmsg, { status: 403, statusText: 'Forbidden' });
+      }),
+    );
+  });
+  /**
+   * testing delete a tile
+   */
+  describe('#deleteTiles', () => {
+    /**
+     * testing method deleteTile()
+     */
+    it(
+      'should delete a tile correctly (mocked http delete request)',
+      waitForAsync(() => {
+        service.deleteTile(mockTile).then(response => {
+          expect(response).toBeDefined();
+        });
+        const req = httpmock.expectOne(environment.backendServerUrl + '/tiles/' + mockTile.id);
+        expect(req.request.method).toEqual('DELETE');
+        req.flush({});
+      }),
+    );
+
+    /**
+     * testing method deleteTiles() in case the backend responds with 404 Not Found and the tile does not exist
+     */
+    it(
+      'deleteTiles(): should handle 404 error',
+      waitForAsync(() => {
+        errmsg = '404 error';
+        // Make an HTTP Get Request
+        service.deleteTile(mockTile).then(
+          () => fail('should have failed with the 404 error'),
+          (err: HttpErrorResponse) => {
+            expect(err.status).toEqual(404);
+            expect(err.error).toEqual(errmsg);
+          },
+        );
+
+        const req = httpmock.expectOne(backendServerUrlTest + '/' + mockTile.id);
+        expect(req.request.method).toEqual('DELETE');
+
+        req.flush(errmsg, { status: 404, statusText: 'Not Found' });
+      }),
+    );
+
+    /**
+     * testing method deleteTiles() in case the backend responds with 401 Unauthorized
+     */
+    it(
+      'deleteTiles(): should handle 401 error',
+      waitForAsync(() => {
+        errmsg = '401 error';
+        // Make an HTTP Get Request
+        service.deleteTile(mockTile).then(
+          () => fail('should have failed with the 401 error'),
+          (err: HttpErrorResponse) => {
+            expect(err.status).toEqual(401);
+            expect(err.error).toEqual(errmsg);
+          },
+        );
+
+        const req = httpmock.expectOne(backendServerUrlTest + '/' + mockTile.id);
+        expect(req.request.method).toEqual('DELETE');
+
+        req.flush(errmsg, { status: 401, statusText: 'Unauthorized' });
+      }),
+    );
+
+    /**
+     * testing method deleteTiles() in case the backend responds with 403 Forbidden
+     */
+    it(
+      'deleteTiles(): should handle 403 error',
+      waitForAsync(() => {
+        errmsg = '403 error';
+        // Make an HTTP Get Request
+        service.deleteTile(mockTile).then(
+          () => fail('should have failed with the 404 error'),
+          (err: HttpErrorResponse) => {
+            expect(err.status).toEqual(403);
+            expect(err.error).toEqual(errmsg);
+          },
+        );
+
+        const req = httpmock.expectOne(backendServerUrlTest + '/' + mockTile.id);
+        expect(req.request.method).toEqual('DELETE');
+
+        req.flush(errmsg, { status: 403, statusText: 'Forbidden' });
+      }),
+    );
+  });
+});
diff --git a/src/app/services/tileservice/tiles.service.ts b/src/app/services/tileservice/tiles.service.ts
new file mode 100644
index 0000000..167e42a
--- /dev/null
+++ b/src/app/services/tileservice/tiles.service.ts
@@ -0,0 +1,88 @@
+/*
+ * Copyright (c) 2022. Deutsche Telekom AG
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+
+import { HttpClient, HttpHeaders } from '@angular/common/http';
+import { Injectable } from '@angular/core';
+import { Observable } from 'rxjs';
+import { environment } from 'src/environments/environment';
+import { Tile, TilesListResponse } from '../../model/tile';
+import { map } from 'rxjs/operators';
+
+export const urlTileApi = environment.backendServerUrl + '/tiles';
+
+@Injectable({
+  providedIn: 'root',
+})
+// Tutorial on the http client: https://angular.io/tutorial/toh-pt6#get-heroes-with-httpclient
+export class TilesService {
+  constructor(private httpClient: HttpClient) {}
+  /**
+   * GET tiles from the server
+   */
+  getTiles(refresh = false): Observable<Tile[]> {
+    if (refresh) {
+      const headers = new HttpHeaders({ 'x-refresh': 'true' });
+      return this.httpClient
+        .get<TilesListResponse>(urlTileApi, { headers })
+        .pipe(map(tilesListResponse => tilesListResponse.items));
+    }
+
+    return this.httpClient.get<TilesListResponse>(urlTileApi).pipe(map(tilesListResponse => tilesListResponse.items));
+  }
+
+  /**
+   * GET tile by id
+   * @param id to get specific tile
+   */
+  getTileById(id: number): Promise<Tile> {
+    return this.httpClient.get<Tile>(urlTileApi + '/' + id).toPromise();
+  }
+
+  /**
+   * POST: add a new tile to the database
+   * @param tile
+   * @returns the new saved tile
+   */
+  saveTiles(tile: Tile): Promise<Tile> {
+    const options = {
+      headers: new HttpHeaders({ 'Content-Type': 'application/json' }),
+    };
+    return this.httpClient.post<Tile>(urlTileApi, tile, options).toPromise();
+  }
+
+  /**
+   * PUT: update the tile on the server
+   * @returns the updated hero
+   * @param tile
+   */
+  updateTiles(tile: Tile): Promise<Tile> {
+    const options = {
+      headers: new HttpHeaders({ 'Content-Type': 'application/json' }),
+    };
+    return this.httpClient.put<Tile>(urlTileApi + '/' + tile.id, tile, options).toPromise();
+  }
+
+  /**
+   * DELETE: delete the tile from the server
+   * @param tile to delete
+   */
+  deleteTile(tile: Tile): Promise<void> {
+    return this.httpClient.delete<void>(urlTileApi + '/' + tile.id).toPromise();
+  }
+}
diff --git a/src/app/services/unsubscribe/unsubscribe.service.ts b/src/app/services/unsubscribe/unsubscribe.service.ts
new file mode 100644
index 0000000..b27f6d8
--- /dev/null
+++ b/src/app/services/unsubscribe/unsubscribe.service.ts
@@ -0,0 +1,32 @@
+/*
+ * Copyright (c) 2022. Deutsche Telekom AG
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+
+import { Injectable, OnDestroy } from '@angular/core';
+import { Subject } from 'rxjs';
+
+@Injectable()
+export class UnsubscribeService implements OnDestroy {
+  private readonly sub$ = new Subject<void>();
+  public readonly unsubscribe$ = this.sub$.asObservable();
+
+  ngOnDestroy(): void {
+    this.sub$.next();
+    this.sub$.complete();
+  }
+}
diff --git a/src/app/services/user-settings.service.ts b/src/app/services/user-settings.service.ts
new file mode 100644
index 0000000..cbaa992
--- /dev/null
+++ b/src/app/services/user-settings.service.ts
@@ -0,0 +1,111 @@
+/*
+ * Copyright (c) 2022. Deutsche Telekom AG
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+
+import { distinctUntilChanged, map, pluck, switchMap, take } from 'rxjs/operators';
+import { PreferencesResponse, PreferencesService } from '../../../openapi/output';
+import {
+  DashboardAppsModel,
+  DashboardModel,
+  DashboardTileSettings,
+  defaultUserSettings,
+  LastUserActionSettings, STATE_KEYS,
+  UpdateUserPreferenceModel,
+  UserPreferencesModel,
+} from '../model/user-preferences.model';
+import { BehaviorSubject, Observable, pipe, UnaryFunction } from 'rxjs';
+import { mergeWith as _mergeWith, isObject as _isObject } from 'lodash';
+import { isString } from '../helpers/helpers';
+import { Injectable } from '@angular/core';
+
+@Injectable({
+  providedIn: 'root',
+})
+export class UserSettingsService {
+  private userSettings: UserPreferencesModel = defaultUserSettings;
+  private preferencesTracker$ = new BehaviorSubject<UserPreferencesModel>(this.userSettings);
+
+  constructor(private preferencesService: PreferencesService) {
+    this.getPreferences();
+  }
+
+  getPreferences$(): Observable<UserPreferencesModel> {
+    return this.preferencesTracker$.asObservable();
+  }
+
+  selectDashboard = () =>
+    this.getPreferences$().pipe(selectDistinctState<UserPreferencesModel, DashboardModel>(STATE_KEYS.DASHBOARD));
+  selectDashboardApps = () =>
+    this.selectDashboard().pipe(selectDistinctState<DashboardModel, DashboardAppsModel>(STATE_KEYS.APPS));
+  selectDashboardAvailableTiles = () =>
+    this.selectDashboardApps().pipe(selectDistinctState<DashboardAppsModel, DashboardTileSettings[]>(STATE_KEYS.TILES));
+  selectLastUserAction = () =>
+    this.selectDashboardApps().pipe(
+      selectDistinctState<DashboardAppsModel, LastUserActionSettings>(STATE_KEYS.USER_ACTIONS),
+    );
+
+  getPreferences(): void {
+    this.preferencesService
+      .getPreferences()
+      .pipe(
+        map(preferences => {
+          return _mergeWith({}, defaultUserSettings, preferences.properties, (objValue, srcValue) => {
+            if (
+              (Array.isArray(srcValue) && !srcValue.some(_isObject)) ||
+              isString(srcValue) ||
+              typeof srcValue === 'boolean' ||
+              Number.isInteger(srcValue)
+            ) {
+              return srcValue;
+            }
+          }) as UserPreferencesModel;
+        }),
+      )
+      .subscribe(userPreferences => {
+        this.preferencesTracker$.next(userPreferences);
+      });
+  }
+
+  updatePreferences(preferences: UpdateUserPreferenceModel): Observable<PreferencesResponse> {
+    return this.getPreferences$().pipe(
+      take(1),
+      switchMap(data => {
+        const properties = _mergeWith({}, data, preferences, (objValue, srcValue) => {
+          if (
+            Array.isArray(srcValue) ||
+            isString(srcValue) ||
+            typeof srcValue === 'boolean' ||
+            Number.isInteger(srcValue)
+          ) {
+            return srcValue;
+          }
+        }) as UserPreferencesModel;
+        this.preferencesTracker$.next(properties);
+        return this.preferencesService.savePreferences({ properties });
+      }),
+    );
+  }
+
+  removePreferences(): Observable<PreferencesResponse> {
+    return this.preferencesService.updatePreferences({ properties: {} });
+  }
+}
+
+export function selectDistinctState<T, I>(key: string): UnaryFunction<Observable<T>, Observable<I>> {
+  return pipe(pluck<T, I>(key), distinctUntilChanged<I>());
+}