US03: Make it possible to update a hourse through the web UI

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

@@ -3,6 +3,7 @@ import { Routes, RouterModule } from '@angular/router';
 import { OwnerComponent } from './component/owner/owner.component';
 import { HorseComponent } from './component/horse/horse.component';
 import { AddHorseComponent } from './component/add-horse/add-horse.component';
+import { UpdateHorseComponent } from './component/update-horse/update-horse.component';
 
 
 const routes: Routes = [
@@ -10,6 +11,7 @@ const routes: Routes = [
   {path: 'owner', component: OwnerComponent},
   {path: 'horse', component: HorseComponent},
   {path: 'horse/add', component: AddHorseComponent},
+  {path: 'horse/:id/edit', component: UpdateHorseComponent},
 ];
 
 @NgModule({

frontend/wendys-friends/src/app/app.module.ts

@@ -9,6 +9,7 @@ import {HeaderComponent} from './component/header/header.component';
 import {OwnerComponent} from './component/owner/owner.component';
 import { HorseComponent } from './component/horse/horse.component';
 import { AddHorseComponent } from './component/add-horse/add-horse.component';
+import { UpdateHorseComponent } from './component/update-horse/update-horse.component';
 
 @NgModule({
   declarations: [
@@ -16,7 +17,8 @@ import { AddHorseComponent } from './component/add-horse/add-horse.component';
     HeaderComponent,
     OwnerComponent,
     HorseComponent,
-    AddHorseComponent
+    AddHorseComponent,
+    UpdateHorseComponent
   ],
   imports: [
     BrowserModule,

frontend/wendys-friends/src/app/component/update-horse/update-horse.component.html

@@ -0,0 +1,61 @@
+<div *ngIf="error" class="alert alert-danger alert-dismissible fade show" role="alert">
+    <strong>Error! </strong> {{ errorMessage }}
+    <button type="button" (click)="vanishError()" class="close" data-dismiss="alert" aria-label="Close">
+      <span aria-hidden="true">&times;</span>
+    </button>
+  </div>
+
+  <div *ngIf="success" class="alert alert-success alert-dismissible fade show" role="alert">
+    <p><strong>Success! </strong> Horse {{ success }} has been successfully added. </p>
+    <button type="button" (click)="vanishAlert()" class="close" data-dismiss="alert" aria-label="Close">
+      <span aria-hidden="true">&times;</span>
+    </button>
+  </div>
+
+  <div class="container">
+    <h1>Add new horse</h1>
+    <form (ngSubmit)="updateHorse()" #horseForm="ngForm">
+      <div class="form-group">
+        <label for="name">Name</label>
+        <input type="text" class="form-control" name="name" [(ngModel)]="horse.name" required>
+      </div>
+
+      <div class="form-group">
+        <label for="description">Description</label>
+        <textarea class="form-control" name="description" [(ngModel)]="horse.description"></textarea>
+      </div>
+
+      <div class="form-group">
+        <label for="score">Score</label>
+        <select class="form-control" name="score" [(ngModel)]="horse.score" required>
+          <option value="1">1</option>
+          <option value="2">2</option>
+          <option value="3">3</option>
+          <option value="4">4</option>
+          <option value="5">5</option>
+        </select>
+      </div>
+
+      <div class="form-group">
+        <label for="race">Race</label>
+        <select class="form-control" name="race" [(ngModel)]="horse.race" required>
+          <option value="ARABIAN">Arabian</option>
+          <option value="MORGAN">Morgan</option>
+          <option value="PAINT">Paint</option>
+          <option value="APPALOOSA">Appaloosa</option>
+        </select>
+      </div>
+
+      <div class="form-group">
+        <label for="birthday">Birthday</label>
+        <input type="date" class="form-control" name="birthday" [(ngModel)]="horse.birthday" required pattern="\d{4}-\d{2}-\d{2}">
+      </div>
+
+      <div class="form-group">
+        <label for="image">Image</label>
+        <input type="file" class="form-control-file" name="image" id="image" (change)="handleImageInput($event.target.files)" required>
+      </div>
+
+      <button type="submit" class="btn btn-success" [disabled]="!horseForm.form.valid" (submit)="updateHorse()">Submit</button>
+    </form>
+  </div>

frontend/wendys-friends/src/app/component/update-horse/update-horse.component.ts

@@ -0,0 +1,132 @@
+import { Component, OnInit } from '@angular/core';
+import { ActivatedRoute, Params} from '@angular/router';
+import { Horse } from '../../dto/horse';
+import { HorseService } from '../../service/horse.service';
+
+@Component({
+  selector: 'app-update-horse',
+  templateUrl: './update-horse.component.html',
+  styleUrls: ['./update-horse.component.scss']
+})
+export class UpdateHorseComponent implements OnInit {
+  error = false;
+  success: string;
+  errorMessage = '';
+  horse: Horse = new Horse(null, null, null, null, null, null, null, null);
+  imageToUpload: File = null;
+
+  constructor(private horseService: HorseService, private route: ActivatedRoute) { }
+
+  ngOnInit(): void {
+    // Extract id from url
+    const horseId: string = this.route.snapshot.paramMap.get('id');
+
+    // Get current value of the horse and save it
+    this.horseService.getHorseById(parseInt(horseId, 10)).subscribe(
+      (horse: Horse) => {
+        this.horse = horse;
+      },
+      error => {
+        this.defaultServiceErrorHandling(error);
+      }
+    );
+  }
+
+  /**
+   * Will be called on a click on the success alert close button
+   */
+  public vanishAlert() {
+    this.success = null;
+  }
+
+  /**
+   * Will be called on a click on the error alert close button
+   */
+  public vanishError() {
+    this.errorMessage = null;
+  }
+
+  /**
+   * Handles the input on the image input.
+   * Inspired from:
+   * https://stackoverflow.com/questions/47936183/angular-file-upload
+   * @param files
+   */
+  public handleImageInput(files: FileList) {
+    var imageFile: File = files.item(0);
+
+    // Generate a random bytes name to avoid conflicts
+    var fileExt: string = imageFile.name.split('.').pop();
+    var newFileName: string = this.generateHex(20) + '.' + fileExt;
+    this.horse.imagePath = newFileName;
+
+    // Upload the file
+    this.uploadFile(imageFile, newFileName)
+  }
+
+  /**
+   * Updates a horse and loads it
+   * @param horse
+   */
+  public updateHorse() {
+    console.log("PUT horse to API")
+    console.log(this.horse);
+    // TODO: Make it possible for the horse to be added with an owner
+    this.horseService.updateHorse(this.horse).subscribe(
+      (result: Horse) => {
+        this.success = result.name;
+      },
+      error => {
+        this.defaultServiceErrorHandling(error);
+      }
+    );
+  }
+
+  /**
+   * Uploads the file to the backend with the specified file name
+   * @param file
+   * @param newFileName
+   */
+  private uploadFile(file: File, newFileName: string){
+    this.horseService.postFile(file, newFileName).subscribe(
+      () => {
+        console.log("Image successfully uploaded");
+      }, error => {
+        this.defaultServiceErrorHandling(error)
+      });
+  }
+
+  /**
+   * Generates a random hex with the specified length
+   * Inspired from:
+   * https://stackoverflow.com/a/27747377
+   * @param len
+   */
+  private generateHex(len: number): string {
+    var arr = new Uint8Array((len) / 2)
+    window.crypto.getRandomValues(arr)
+    return Array.from(arr, this.dec2hex).join('')
+  }
+
+  /**
+   * Converts a decimal to its hex value
+   * @param dec
+   */
+  private dec2hex(dec: number): string {
+    return ('0' + dec.toString(16)).substr(-2)
+  }
+
+  private defaultServiceErrorHandling(error: any) {
+    console.log(error);
+    this.error = true;
+    if (error.status === 0) {
+      // If status is 0, the backend is probably down
+      this.errorMessage = 'The backend seems not to be reachable';
+    } else if (error.error.message === 'No message available') {
+      // If no detailed error message is provided, fall back to the simple error name
+      this.errorMessage = error.error.error;
+    } else {
+      this.errorMessage = error.error.message;
+    }
+  }
+}

frontend/wendys-friends/src/app/service/horse.service.ts

@@ -31,6 +31,11 @@ export class HorseService {
     return this.httpClient.post<Horse>(this.messageBaseUri, horse);
   }
 
+  updateHorse(horse: Horse): Observable<Horse> {
+    console.log('Update horse with id ' + horse.id + ': '+ JSON.stringify(horse));
+    return this.httpClient.put<Horse>(this.messageBaseUri + '/' + horse.id, horse);
+  }
+
   /**
    *
    */