Allow direct entry for participants

Login the user as guest if he enters the participant room page

src/app/components/participant/room-participant-page/room-participant-page.component.ts

 import { Component, OnInit } from '@angular/core';
 import { Room } from '../../../models/room';
+import { User } from '../../../models/user';
+import { UserRole } from '../../../models/user-roles.enum';
 import { RoomPageComponent } from '../../shared/room-page/room-page.component';
 import { Location } from '@angular/common';
 import { RoomService } from '../../../services/http/room.service';
@@ -8,6 +10,7 @@ import { TranslateService } from '@ngx-translate/core';
 import { LanguageService } from '../../../services/util/language.service';
 import { WsCommentServiceService } from '../../../services/websockets/ws-comment-service.service';
 import { CommentService } from '../../../services/http/comment.service';
+import { AuthenticationService } from '../../../services/http/authentication.service';
 
 @Component({
   selector: 'app-room-participant-page',
@@ -19,6 +22,7 @@ export class RoomParticipantPageComponent extends RoomPageComponent implements O
   room: Room;
   isLoading = true;
   deviceType = localStorage.getItem('deviceType');
+  user: User;
 
 
   constructor(protected location: Location,
@@ -27,7 +31,8 @@ export class RoomParticipantPageComponent extends RoomPageComponent implements O
               private translateService: TranslateService,
               protected langService: LanguageService,
               protected wsCommentService: WsCommentServiceService,
-              protected commentService: CommentService) {
+              protected commentService: CommentService,
+              private authenticationService: AuthenticationService) {
     super(roomService, route, location, wsCommentService, commentService);
     langService.langEmitter.subscribe(lang => translateService.use(lang));
   }
@@ -38,5 +43,9 @@ export class RoomParticipantPageComponent extends RoomPageComponent implements O
       this.initializeRoom(params['roomId']);
     });
     this.translateService.use(localStorage.getItem('currentLang'));
+    this.authenticationService.watchUser.subscribe( user => this.user = user);
+    if (!this.user) {
+      this.authenticationService.guestLogin(UserRole.PARTICIPANT).subscribe(guestUser => {});
+    }
   }
 }