Added progress bar to file downloads

Added two new API calls, to update the server to a particular version and to get the updater status

You can now update through the UI, and a status dialog displays after

src/app/dialogs/update-progress-dialog/update-progress-dialog.component.html

@@ -0,0 +1,18 @@
+<h4 i18n="Update progress dialog title" mat-dialog-title>Updater</h4>
+
+<mat-dialog-content>
+    <div *ngIf="updateStatus">
+        <div style="margin-bottom: 8px;">
+            <h6 *ngIf="updateStatus['updating']">Update in progress</h6>
+            <h6 *ngIf="!updateStatus['updating'] && updateStatus['error']">Update failed</h6>
+            <h6 *ngIf="!updateStatus['updating'] && !updateStatus['error']">Update succeeded!</h6>
+        </div>
+        <mat-progress-bar *ngIf="updateStatus['updating']" mode="indeterminate"></mat-progress-bar>
+        <mat-progress-bar *ngIf="!updateStatus['updating']" mode="determinate" value="100"></mat-progress-bar>
+        <p style="margin-top: 4px; font-size: 13px;" *ngIf="updateStatus['details']">{{updateStatus['details']}}</p>
+    </div>
+</mat-dialog-content>
+
+<mat-dialog-actions>
+    <button mat-button mat-dialog-close><ng-container i18n="Close update progress dialog">Close</ng-container></button>
+</mat-dialog-actions>

src/app/dialogs/update-progress-dialog/update-progress-dialog.component.spec.ts

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

src/app/dialogs/update-progress-dialog/update-progress-dialog.component.ts

@@ -0,0 +1,44 @@
+import { Component, OnInit } from '@angular/core';
+import { PostsService } from 'app/posts.services';
+import { MatSnackBar } from '@angular/material/snack-bar';
+
+@Component({
+  selector: 'app-update-progress-dialog',
+  templateUrl: './update-progress-dialog.component.html',
+  styleUrls: ['./update-progress-dialog.component.scss']
+})
+export class UpdateProgressDialogComponent implements OnInit {
+
+  updateStatus = null;
+  updateInterval = 250;
+  errored = false;
+
+  constructor(private postsService: PostsService, private snackBar: MatSnackBar) { }
+
+  ngOnInit(): void {
+    this.getUpdateProgress();
+    setInterval(() => {
+      this.getUpdateProgress();
+    }, 250);
+  }
+
+  getUpdateProgress() {
+    this.postsService.getUpdaterStatus().subscribe(res => {
+      this.updateStatus = res;
+      if (!this.updateStatus) {
+        // update complete?
+        console.log('Update complete? or not started');
+      }
+      if (this.updateStatus && this.updateStatus['error']) {
+        this.openSnackBar('Update failed. Check logs for more details.');
+      }
+    });
+  }
+
+  public openSnackBar(message: string, action: string = '') {
+    this.snackBar.open(message, action, {
+      duration: 2000,
+    });
+  }
+
+}