Notification system enhanced

- Base for notifcation center
- Show text in map if no data is available

backend/app.ts

@@ -10,6 +10,7 @@ import * as winston from 'winston';
 
 import { config } from './config';
 import { GetBeat, GetBeatStats } from './endpoints/beat';
+import { getNotification } from './endpoints/notification';
 import { GetPhone, PostPhone } from './endpoints/phone';
 import { DeleteUser, GetUser, LoginRabbitUser, LoginUser, MW_User, PatchUser, PostUser, Resource, Topic, VHost } from './endpoints/user';
 import { hashPassword, randomPepper, randomString } from './lib/crypto';
@@ -145,17 +146,20 @@ async function run() {
     app.get('/user/resource', (req, res) => Resource(req, res));
     app.get('/user/topic', (req, res) => Topic(req, res));
 
-    // Basic user actions
+    // CRUD user
+    app.get('/user/notification', MW_User, (req, res) => getNotification(req, res));    // Notifications
     app.get('/user/', MW_User, (req, res) => GetUser(req, res));
     app.post('/user/', MW_User, (req, res) => PostUser(req, res));
     app.get('/user/:id', MW_User, (req, res) => GetUser(req, res));
     app.patch('/user/:id', MW_User, (req, res) => PatchUser(req, res));
     app.delete('/user/:id', MW_User, (req, res) => DeleteUser(req, res));
 
+    // Phones
     app.get('/phone/:id', MW_User, (req, res) => GetPhone(req, res));
     app.get('/phone', MW_User, (req, res) => GetPhone(req, res));
     app.post('/phone', MW_User, (req, res) => PostPhone(req, res));
 
+    // Beats
     app.get('/beat/', MW_User, (req, res) => GetBeat(req, res));
     app.get('/beat/stats', MW_User, (req, res) => GetBeatStats(req, res));
 

backend/endpoints/notification.ts

@@ -0,0 +1,22 @@
+import { Response } from "express";
+import { LivebeatRequest } from "../lib/request";
+import { Notification } from "../models/notifications/notification.model";
+
+export async function getNotification(req: LivebeatRequest, res: Response) {
+    let limit = req.query.limit;
+    let skip = req.query.skip;
+
+    if (limit === undefined) { limit = '100' };
+    if (skip === undefined) { skip = '0' };
+
+    try {
+        const notifications = await Notification.find({ user: req.user?._id }).limit(Number(limit)).sort({ _id: -1 });
+        res.status(200).send(notifications);
+    } catch(error: any) {
+        if (error instanceof TypeError) {
+            res.status(400).send({ message: "'Limit' has to be a number" });
+        } else {
+            res.status(500).send({ message: "An error occured while processing your request" });
+        }
+    }
+}

backend/lib/rabbit.ts

@@ -1,7 +1,12 @@
 import * as amqp from 'amqplib';
+import { Schema, SchemaType } from 'mongoose';
 import { logger, RABBITMQ_URI } from '../app';
 import { Beat } from '../models/beat/beat.model.';
+import { ISeverity, NotificationType } from '../models/notifications/notification.interface';
+import { addNotification, Notification } from '../models/notifications/notification.model';
+import { IPhone } from '../models/phone/phone.interface';
 import { Phone } from '../models/phone/phone.model';
+import { User } from '../models/user/user.model';
 
 interface IBeat {
     token: string,
@@ -14,7 +19,7 @@ export class RabbitMQ {
     connection: amqp.Connection | null = null;
     channel: amqp.Channel | null = null;
 
-    timeouts: Map<string, Timeout> = new Map<string, Timeout>();
+    timeouts: Map<string, NodeJS.Timeout> = new Map<string, NodeJS.Timeout>();
 
     async init() {
         this.connection = await amqp.connect(RABBITMQ_URI);
@@ -46,16 +51,15 @@ export class RabbitMQ {
 
             // Broadcast if device became active
             if (this.timeouts.has(phone.id)) {
-                clearTimeout(this.timeouts.get(phone.id));
+                clearTimeout(this.timeouts.get(phone.id)!!);
             } else {
-                logger.debug('Set phone active');
                 phone.active = true;
                 await phone.save();
-                this.publish(phone.user.toString(), phone.toJSON(), 'phone_alive');
+                this.publish(phone.user.toString(), phone.toJSON(), 'phone_alive', ISeverity.SUCCESS);                
             }
 
             const timeoutTimer = setTimeout(async () => {
-                this.publish(phone.user.toString(), phone.toJSON(), 'phone_dead');
+                this.publish(phone.user.toString(), phone.toJSON(), 'phone_dead', ISeverity.WARN);
                 this.timeouts.delete(phone.id);
                 phone.active = false;
                 await phone.save();
@@ -66,10 +70,22 @@ export class RabbitMQ {
         }, { noAck: true });
     }
 
-    async publish(userId: string, data: any, type: 'beat' | 'phone_alive' | 'phone_dead' | 'phone_register' | 'panic' = 'beat') {
+    async publish(userId: string, data: any, type: NotificationType, severity = ISeverity.INFO) {
-        if (this.connection == undefined) await this.init()
+        if (this.connection == undefined) await this.init();
 
-        data = { type, ...data };
+        const user = await User.findById(userId);
+        if (user === null) return;
+
+        /* Manage notifications */
+        if (type != 'beat') {
+            if (type == 'phone_alive' || type == 'phone_dead') {
+                addNotification(type, severity, ((data as IPhone)._id), user);
+            }
+        }
+
+        data = { type, severity, ...data };
+        console.log('Send:', data);
+        
         this.channel?.publish('amq.topic', userId, Buffer.from(JSON.stringify(data)));
     }
 }

backend/models/beat/beat.schema.ts

@@ -6,7 +6,7 @@ const schemaBeat = new Schema({
     accuracy: { type: Number, required: false },
     speed: { type: Number, required: false },
     battery: { type: Number, required: false },
-    phone: { type: SchemaTypes.ObjectId, required: true, default: 'user' },
+    phone: { type: SchemaTypes.ObjectId, required: true },
     createdAt: { type: SchemaTypes.Date, required: false }
 }, {
     timestamps: {

backend/models/notifications/notification.interface.ts

@@ -0,0 +1,18 @@
+import { Document } from "mongoose";
+import { IUser } from "../user/user.interface";
+
+export enum ISeverity {
+    INFO = 0,
+    SUCCESS = 1,
+    WARN = 2,
+    ERROR = 3
+}
+
+export type NotificationType = 'beat' | 'phone_alive' | 'phone_dead' | 'phone_register' | 'panic';
+
+export interface INotification extends Document {
+    type: NotificationType;
+    severity: ISeverity;
+    message: any;
+    user: IUser;
+}

backend/models/notifications/notification.model.ts

@@ -0,0 +1,11 @@
+import { Model, model } from 'mongoose';
+import { IUser } from '../user/user.interface';
+import { INotification, ISeverity, NotificationType } from './notification.interface';
+import { schemaNotification } from './notification.schema';
+
+const modelNotification: Model<INotification> = model<INotification>('Notification', schemaNotification, 'Notification');
+export { modelNotification as Notification };
+
+export function addNotification(type: NotificationType, severity: ISeverity, message: any, user: IUser) {
+    return modelNotification.create({ type, severity, message, user });
+}

backend/models/notifications/notification.schema.ts

@@ -0,0 +1,15 @@
+import { Schema, SchemaTypes } from 'mongoose';
+const schemaNotification = new Schema({
+    type: { type: String, required: true },
+    severity: { type: Number, required: true },
+    message: { type: Object, required: true },
+    user: { type: SchemaTypes.ObjectId }
+}, {
+    timestamps: {
+        createdAt: true,
+        updatedAt: false
+    },
+    versionKey: false
+});
+
+export { schemaNotification };

backend/package-lock.json

@@ -188,10 +188,9 @@
       }
     },
     "@types/node": {
-      "version": "14.11.10",
+      "version": "14.14.9",
-      "resolved": "https://registry.npmjs.org/@types/node/-/node-14.11.10.tgz",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-14.14.9.tgz",
-      "integrity": "sha512-yV1nWZPlMFpoXyoknm4S56y2nlTAuFYaJuQtYRAOU7xA/FJ9RY0Xm7QOkaYMMmr8ESdHIuUb6oQgR/0+2NqlyA==",
+      "integrity": "sha512-JsoLXFppG62tWTklIoO4knA+oDTYsmqWxHRvd4lpmfQRNhX6osheUOWETP2jMoV/2bEHuMra8Pp3Dmo/stBFcw=="
-      "dev": true
     },
     "@types/qs": {
       "version": "6.9.5",

backend/package.json

@@ -17,6 +17,7 @@
   "author": "Mondei1",
   "license": "GPL-3.0-or-later",
   "dependencies": {
+    "@types/node": "^14.14.9",
     "amqplib": "^0.6.0",
     "argon2": "^0.27.0",
     "body-parser": "^1.19.0",

backend/tsconfig.json

@@ -1,6 +1,7 @@
 {
     "compilerOptions": {
-        "target": "ES5",
+        "target": "ES2020",
+        "lib": ["ES2020"],
         "module": "commonjs",
         "outDir": "./dist",
         "rootDir": "./",

frontend/src/app/_alert/alert.service.ts

@@ -16,10 +16,10 @@ export class Alert {
 }
 
 export enum AlertType {
-  Success,
+    INFO = 0,
-  Error,
+    SUCCESS = 1,
-  Info,
+    WARN = 2,
-  Warning
+    ERROR = 3
 }
 
 @Injectable({ providedIn: 'root' })
@@ -36,23 +36,30 @@ export class AlertService {
 
     // convenience methods
     success(message: string, title = 'Success', options?: any): void {
-        this.alert(new Alert({ ...options, type: AlertType.Success, message, title }));
+        this.alert(new Alert({ ...options, type: AlertType.SUCCESS, message, title }));
     }
 
     error(message: string, title = 'Error!', options?: any): void {
         const audio = new Audio(this.errorSoundPath);
         audio.load();
-        audio.play();
+        audio.play().catch(error => {});
 
-        this.alert(new Alert({ ...options, type: AlertType.Error, message, title }));
+        this.alert(new Alert({ ...options, type: AlertType.ERROR, message, title }));
     }
 
     info(message: string, title = 'Info', options?: any): void {
-        this.alert(new Alert({ ...options, type: AlertType.Info, message, title }));
+        this.alert(new Alert({ ...options, type: AlertType.INFO, message, title }));
     }
 
     warn(message: string, title = 'Warning!', options?: any): void {
-        this.alert(new Alert({ ...options, type: AlertType.Warning, message, title }));
+        this.alert(new Alert({ ...options, type: AlertType.WARN, message, title }));
+    }
+
+    /**
+     * Use this to use a variable as alert type.
+     */
+    dynamic(message: string, type: AlertType, title = 'Dynamic', options?: any) {
+        this.alert(new Alert({ ...options, type, message, title }));
     }
 
     // main alert method

frontend/src/app/_alert/alert/alert.component.ts

@@ -62,10 +62,10 @@ export class AlertComponent implements OnInit, OnDestroy {
     const classes = ['alert', 'alert-dismissable'];
 
     const alertTypeClass = {
-      [AlertType.Success]: 'alert alert-success',
+      [AlertType.SUCCESS]: 'alert alert-success',
-      [AlertType.Error]: 'alert alert-danger',
+      [AlertType.ERROR]: 'alert alert-danger',
-      [AlertType.Info]: 'alert alert-info',
+      [AlertType.INFO]: 'alert alert-info',
-      [AlertType.Warning]: 'alert alert-warning'
+      [AlertType.WARN]: 'alert alert-warning'
     };
 
     classes.push(alertTypeClass[alert.type]);

frontend/src/app/api.service.ts

@@ -6,6 +6,9 @@ import * as moment from 'moment';
 import { error } from 'protractor';
 import { AlertService } from './_alert/alert.service';
 
+/*
+ * DEFINITION OF TYPE
+ */
 export interface ILogin {
   token: string;
 }
@@ -65,6 +68,26 @@ export interface ITimespan {
   to?: number;
 }
 
+export enum ISeverity {
+  INFO = 0,
+  SUCCESS = 1,
+  WARN = 2,
+  ERROR = 3
+}
+
+export type NotificationType = 'beat' | 'phone_alive' | 'phone_dead' | 'phone_register' | 'panic';
+
+export interface INotification extends Document {
+  type: NotificationType;
+  severity: ISeverity;
+  message: any;
+  user: IUser;
+}
+
+/*
+ * END OF THE DEFINITION OF TYPE
+ */
+
 @Injectable({
   providedIn: 'root'
 })
@@ -74,10 +97,6 @@ export class APIService {
 
   username: string;
   rabbitmq: any;
-  time: ITimespan | undefined = {
-    from: moment().subtract(1, 'day').unix(),
-    to: moment().unix()
-  };
 
   // Passthough data (not useful for api but a way for components to share data)
   showFilter = true;
@@ -99,6 +118,7 @@ export class APIService {
     createdAt: new Date(),
     twoFASecret: ''
   };
+  notifications: INotification[];
 
   // Events when new data got fetched
   beatsEvent: BehaviorSubject<IBeat[]> = new BehaviorSubject([]);
@@ -121,30 +141,26 @@ export class APIService {
       password: this.user.brokerToken
     });
 
-    this.mqtt.observe(this.user._id).subscribe(message => {
+    this.mqtt.observe(this.user._id).subscribe(async message => {
       if (message !== undefined || message !== null) {
         const obj = JSON.parse(message.payload.toString());
+        console.log('Received message:', obj);
 
-        switch (obj.type) {
+        if (obj.type === 'beat') {
-          case 'beat':
+          if (this.beats !== undefined) {
-            if (this.beats !== undefined) {
+            this.beats.push(obj);
-              this.beats.push(obj);
+            this.beatsEvent.next([obj]);  // We just push one, so the map doesn't has to rebuild everything from scratch.
-              this.beatsEvent.next([obj]);  // We just push one, so the map doesn't has to rebuild everything from scratch.
+            this.beatStats.totalBeats++;
-              this.beatStats.totalBeats++;
+          }
-            }
+        } else if (obj.type === 'phone_available') {
-            break;
+          this.alert.dynamic(`Device ${obj.displayName} is now online`, obj.severity, 'Device');
-          case 'phone_available':
+        } else if (obj.type === 'phone_register') {
-            this.alert.info(`Device ${obj.name} is now online`, 'Device');
+          await this.getPhones();
-            break;
+          this.alert.dynamic(`New device "${obj.displayName}"`, obj.severity, 'New device');
-          case 'phone_register':
+        } else if (obj.type === 'phone_alive') {
-            this.alert.success(`New device "${obj.displayName}"`, 'New device');
+          this.alert.dynamic('Device is now active', obj.severity, obj.displayName);
-            break;
+        } else if (obj.type === 'phone_dead') {
-          case 'phone_alive':
+          this.alert.dynamic('Device is now offline', obj.severity, obj.displayName);
-            this.alert.info('Device is now active', obj.displayName.toString());
-            break;
-          case 'phone_dead':
-            this.alert.warn('Device is now offline', obj.displayName.toString());
-            break;
         }
       }
     });
@@ -163,6 +179,7 @@ export class APIService {
           this.username = username;
           await this.getPhones();
           await this.getUserInfo();
+          await this.getNotifications();
 
           this.mqttInit();
 
@@ -208,20 +225,25 @@ export class APIService {
   /*
    BEATS
    */
-  async getBeats(): Promise<IBeat[]> {
+  async getBeats(time?: ITimespan): Promise<IBeat[]> {
     return new Promise<IBeat[]>((resolve, reject) => {
       if (this.token === undefined) { reject([]); }
 
       this.fetchingDataEvent.next(true);
 
+      // If time is not specified, default to 'today'
+      if (time === undefined) {
+        time = { from: moment().startOf('day').unix(), to: moment().unix() };
+      }
+
       const headers = new HttpHeaders({ token: this.token });
       let params = new HttpParams();
 
-      if (this.time !== undefined) {
+      if (time !== undefined) {
-        params = params.set('from', this.time.from.toString());
+        params = params.set('from', time.from.toString());
 
-        if (this.time.to !== 0) {
+        if (time.to !== 0) {
-          params = params.set('to', this.time.to.toString());
+          params = params.set('to', time.to.toString());
         }
       }
 
@@ -314,6 +336,10 @@ export class APIService {
     });
   }
 
+  /**
+   * Fetch information about one phone from API and cache them locally.
+   * @param phoneId Object id of target phone
+   */
   async getPhone(phoneId: string): Promise<{ IPhone, IBeat }> {
     return new Promise<{ IPhone, IBeat }>((resolve, reject) => {
       if (this.token === undefined) { reject([]); }
@@ -330,6 +356,35 @@ export class APIService {
     });
   }
 
+  /**
+   * This function searchs for the target phone in local array.
+   *
+   * **Notice:** If you want to fetch data again from the server consider using `getPhone(...)`.
+   * @param phoneId Object id of target phone
+   */
+  getPhoneFromCache(phoneId: string): IPhone | undefined {
+    return this.phones.find((phone, i, array) => {
+      if (phone._id === phoneId) { return true; }
+    });
+  }
+
+  getNotifications(): Promise<INotification[]> {
+    return new Promise<INotification[]>((resolve, reject) => {
+      if (!this.hasSession()) { resolve([]); }
+
+      const headers = new HttpHeaders({ token: this.token });
+
+      this.fetchingDataEvent.next(true);
+
+      this.httpClient.get(this.API_ENDPOINT + '/user/notification', { responseType: 'json', headers })
+        .subscribe((notifications: INotification[]) => {
+          this.notifications = notifications;
+          this.fetchingDataEvent.next(false);
+          resolve(notifications);
+        });
+    });
+  }
+
   /* HELPER CLASSES */
   degreesToRadians(degrees: number): number {
     return degrees * Math.PI / 180;

frontend/src/app/app-routing.module.ts

@@ -5,6 +5,7 @@ import { AppComponent } from './app.component';
 import { DashboardComponent } from './dashboard/dashboard.component';
 import { LoginComponent } from './login/login.component';
 import { MapComponent } from './map/map.component';
+import { NotificationsComponent } from './notifications/notifications.component';
 import { UserComponent } from './user/user.component';
 
 const routes: Routes = [
@@ -24,6 +25,10 @@ const routes: Routes = [
     path: 'map',
     component: MapComponent
   },
+  {
+    path: 'notifications',
+    component: NotificationsComponent
+  },
   {
     path: 'user/:id',
     component: UserComponent

frontend/src/app/app.component.html

@@ -5,6 +5,9 @@
     <li><a [routerLink]="['/dashboard']" routerLinkActive="router-link-active">Dashboard</a></li>
     <li><a [routerLink]="['/map']" routerLinkActive="router-link-active">Map</a></li>
 
+    <li class="navbar-right"><a [routerLink]="['/notifications']">
+      <img src="assets/message.svg">
+    </a></li>
     <li class="navbar-right"><a [routerLink]="['/user', this.api.user._id]"
         routerLinkActive="router-link-active">
         <fa-icon [icon]="faUser"></fa-icon>

frontend/src/app/app.module.ts

@@ -20,6 +20,7 @@ import { environment } from '../environments/environment';
 import { AdminComponent } from './admin/admin.component';
 import { AlertComponent } from './_alert/alert/alert.component';
 import { FontAwesomeModule } from '@fortawesome/angular-fontawesome';
+import { NotificationsComponent } from './notifications/notifications.component';
 
 @NgModule({
   declarations: [
@@ -31,7 +32,8 @@ import { FontAwesomeModule } from '@fortawesome/angular-fontawesome';
     UserComponent,
     DashboardWidgetComponent,
     AdminComponent,
-    AlertComponent
+    AlertComponent,
+    NotificationsComponent
   ],
   imports: [
     BrowserModule,

frontend/src/app/filter/filter.component.ts

@@ -12,40 +12,47 @@ export class FilterComponent implements OnInit {
   presetHours = -1;
   customRange: any;
   customUnit: moment.unitOfTime.DurationConstructor;
+  timeRange: ITimespan; // Differs to customRange since this is the actual object used for query.
 
   constructor(public api: APIService) { }
 
   ngOnInit(): void {
   }
 
-  update(value: number): void {
+  /**
-    let result: ITimespan | undefined = { to: 0, from: 0 };
+   * @param value Time in hours.
+   * Except: `-1`: Today,
+   *         `-2`: Custom time range,
+   *         `0`: All time
+   */
+  update(): void {
+    let time: ITimespan = { from: 0, to: 0 };
     console.log(this.customRange, this.customUnit, this.presetHours);
 
     if (this.presetHours == -2) {
       if (this.customRange !== undefined && this.customUnit !== undefined) {
-        result.from = moment().subtract(this.customRange, this.customUnit).unix();
+        time.from = moment().subtract(this.customRange, this.customUnit).unix();
-        console.log(result.from);
       }
     } else if (this.presetHours == -1) {
-      result.from = moment().startOf('day').unix();
+      time.from = moment().startOf('day').unix();
     } else if (this.presetHours == 0) {
-      result = undefined;
+      // Do nothing since we want `from` to stay zero.
     } else {
-      result.from = moment().subtract(this.presetHours, 'hours').unix();
+      time.from = moment().subtract(this.presetHours, 'hours').unix();
     }
 
-    console.log(result);
+    time.to = moment().unix();
-    this.api.time = result;
+    this.timeRange = time;
-    this.refresh();
+
+    this.refresh(time);
   }
 
   updateAccuracy(val: any): void {
     this.api.maxAccuracy.next(Number(val.target.value));
   }
 
-  async refresh(): Promise<void> {
+  async refresh(time: ITimespan): Promise<void> {
-    await this.api.getBeats();
+    await this.api.getBeats(time);
     await this.api.getBeatStats();
     await this.api.getPhones();
     await this.api.getUserInfo();

frontend/src/app/map.worker.ts

@@ -25,7 +25,7 @@ addEventListener('message', ({ data }) => {
     progress++;
 
     // Report progress every fifth loop
-    if (Math.trunc(progress / data.length * 100) % 5 === 0) {
+    if (Math.trunc(progress / data.length * 100) % 3 === 0) {
       postMessage({ progress: (progress / data.length) * 100 });
     }
 
@@ -49,6 +49,5 @@ addEventListener('message', ({ data }) => {
     }
   });
 
-  console.log(`worker response to`, mostVisit);
   postMessage(mostVisit);
 });

frontend/src/app/map/map.component.html

@@ -36,4 +36,8 @@
         position="top-right"
       ></mgl-control>
     </div>
-</mgl-map>
+</mgl-map>
+<div id="noData" *ngIf="!this.showMap">
+  <h1>There is no data</h1><br>
+  <p>Selected time span does not contain any coordiantes.</p>
+</div>

frontend/src/app/map/map.component.scss

@@ -5,4 +5,13 @@ mgl-map {
     left: 0;
     height: 100vh;
     width: 100vw;
+}
+
+#noData {
+    position: fixed;
+    top: 35vh;
+    text-align: center;
+    height: 100vh;
+    width: 100%;
+    z-index: -1;
 }

frontend/src/app/map/map.component.ts

@@ -161,8 +161,12 @@ export class MapComponent {
   buildMap(isUpdate: boolean, maxAccuracy: number = 30): void {
     // If this is an update don't rebuild entire map.
     if (!isUpdate) {
-      if (this.api.beats.length === 0) {
+      if (this.api.beats !== undefined) {
-        console.warn('Build map method was called while there are no beats!');
+        if (this.api.beats.length === 0) {
+          console.warn('Build map method was called while there are no beats!');
+          return;
+        }
+      } else {
         return;
       }
 

frontend/src/app/notifications/notifications.component.html

@@ -0,0 +1,3 @@
+<div id="notifications">
+    <h1>Notifications</h1>
+</div>

frontend/src/app/notifications/notifications.component.scss

@@ -0,0 +1,4 @@
+#notifications {
+    margin-left: 3rem;
+    margin-right: 3rem;
+}

frontend/src/app/notifications/notifications.component.spec.ts

@@ -0,0 +1,25 @@
+import { ComponentFixture, TestBed } from '@angular/core/testing';
+
+import { NotificationsComponent } from './notifications.component';
+
+describe('NotificationsComponent', () => {
+  let component: NotificationsComponent;
+  let fixture: ComponentFixture<NotificationsComponent>;
+
+  beforeEach(async () => {
+    await TestBed.configureTestingModule({
+      declarations: [ NotificationsComponent ]
+    })
+    .compileComponents();
+  });
+
+  beforeEach(() => {
+    fixture = TestBed.createComponent(NotificationsComponent);
+    component = fixture.componentInstance;
+    fixture.detectChanges();
+  });
+
+  it('should create', () => {
+    expect(component).toBeTruthy();
+  });
+});

frontend/src/app/notifications/notifications.component.ts

@@ -0,0 +1,25 @@
+import { AfterContentInit, Component, OnDestroy, OnInit } from '@angular/core';
+import { APIService } from '../api.service';
+
+@Component({
+  selector: 'app-notifications',
+  templateUrl: './notifications.component.html',
+  styleUrls: ['./notifications.component.scss']
+})
+export class NotificationsComponent implements OnInit, AfterContentInit, OnDestroy {
+
+  constructor(private api: APIService) { }
+
+  ngOnInit(): void {
+  }
+
+  ngAfterContentInit(): void {
+    this.api.showFilter = false;
+    console.log(this.api.showFilter);
+  }
+
+  ngOnDestroy(): void {
+    this.api.showFilter = true;
+  }
+
+}

frontend/src/assets/message.svg

@@ -0,0 +1,8 @@
+<svg xmlns="http://www.w3.org/2000/svg" class="icon icon-tabler icon-tabler-message" width="19" height="19" viewBox="0 0 24 24" stroke-width="2" stroke="#fff" fill="none" stroke-linecap="round" stroke-linejoin="round">
+  <path stroke="none" d="M0 0h24v24H0z" fill="none"/>
+  <path d="M4 21v-13a3 3 0 0 1 3 -3h10a3 3 0 0 1 3 3v6a3 3 0 0 1 -3 3h-9l-4 4" />
+  <line x1="8" y1="9" x2="16" y2="9" />
+  <line x1="8" y1="13" x2="14" y2="13" />
+</svg>
+
+