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import {Injectable} from '@angular/core';
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import {HttpClient, HttpResponse} from '@angular/common/http';
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import {Observable, of} from 'rxjs';
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import {catchError, mapTo, tap} from 'rxjs/operators';
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import {Router} from '@angular/router';
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import {CookieService} from 'ngx-cookie-service';
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import {UserState} from '../states/user.state';
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import {LoginService} from '../../shared/api/endpoints/services/login.service';
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import {User} from '../models/user';
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import {GlobalVariable} from '../../globals';
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import {UserCookie} from '../../shared/api/endpoints/models/user-cookie';
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@Injectable({
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  providedIn: 'root'
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})
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export class AuthService {
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  constructor(
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    private http: HttpClient,
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    private userState: UserState,
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    private router: Router,
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    private cookieService: CookieService,
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    private loginService: LoginService
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  ) {
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  }
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  /**
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   * Set state from saved cookies
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   */
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  setFromCookie() {
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    const user: User = {
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      userCookie: {
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        rightsID: JSON.parse(localStorage.getItem(GlobalVariable.RIGHTS)),
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        language: this.cookieService.get(GlobalVariable.LANGUAGE),
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        audio: JSON.parse(this.cookieService.get(GlobalVariable.AUDIO)),
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        sessionid: this.cookieService.get(GlobalVariable.SESSION_ID)
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      },
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      isLoggedIn: true
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    }
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    this.userState.setUser(user);
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  }
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  /**
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   * Get user from state
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   */
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  getUser() {
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    console.log('Auth Service');
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    if (!this.userState.getUser() && this.cookieService.get(GlobalVariable.SESSION_ID)) {
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      console.log('Session in cookie!');
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      this.setFromCookie();
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    }
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    return this.userState.getUser();
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  }
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  /**
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   * Get user from state as observable
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   */
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  getUserState(): Observable<User> {
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    return this.userState.getUser$();
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  }
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  /**
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   * Login process with backend call
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   * @param loginInput login form
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   */
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  doLogin(loginInput): Observable<boolean> {
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    return this.loginService.login$Response(loginInput)
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      .pipe(
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        tap((userCookie: HttpResponse<UserCookie>) => this.setUserFromResponse(userCookie.body, loginInput.username)),
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        mapTo(true),
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        catchError(() => {
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          return of<boolean>(false);
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        })
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      );
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  }
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  /**
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   * Set user state, cookie and localStorage from server response
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   * @param userCookie server response
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   * @param username form username
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   */
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  setUserFromResponse(userCookie: UserCookie, username): UserCookie {
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    console.log('Setting user from login!');
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    this.userState.setUser({
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      userCookie,
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      isLoggedIn: true
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    });
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    this.setSessionStorage(userCookie, username);
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    return userCookie;
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  }
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  /**
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   * Logout user, clear user state and redirect to login
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   */
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  doLogout() {
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    this.userState.setUser(null);
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    this.cookieService.deleteAll();
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    localStorage.clear();
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    this.router.navigate(['/login']);
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    this.cookieService.deleteAll();
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  }
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  /**
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   * Set localstorage and cookies
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   * @param userCookie user obejct
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   * @param username username from login form
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   */
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  setSessionStorage(userCookie: UserCookie, username) {
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    localStorage.setItem(GlobalVariable.USER_NAME, username)
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    localStorage.setItem(GlobalVariable.RIGHTS, userCookie.rightsID.toString());
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    this.cookieService.set('user', username);
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  }
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  redirectToDashboard() {
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    this.router.navigate(['/dashboard']);
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  }
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}
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