downloads refactor half done - videos are now implement, but audo files are now

Added downloads manager in the UI where downloads can be viewed/cleared

src/app/components/downloads/downloads.component.html

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+<div style="padding: 20px;">
+    <div *ngFor="let session_downloads of downloads | keyvalue">
+        <ng-container *ngIf="keys(session_downloads.value).length > 0">
+            <mat-card style="padding-bottom: 30px; margin-bottom: 15px;">
+                <h4 style="text-align: center;"><ng-container i18n="Session ID">Session ID:</ng-container>&nbsp;{{session_downloads.key}}
+                    <span *ngIf="session_downloads.key === postsService.session_id">&nbsp;<ng-container i18n="Current session">(current)</ng-container></span>
+                </h4>
+                <div class="container">
+                    <div class="row">
+                        <div *ngFor="let download of session_downloads.value | keyvalue; let i = index;" class="col-12 my-1">
+                            <mat-card *ngIf="download.value" class="mat-elevation-z3">
+                                <app-download-item [download]="download.value" [queueNumber]="i+1" (cancelDownload)="clearDownload(session_downloads.key, download.value.uid)"></app-download-item>
+                            </mat-card>
+                        </div>
+                    </div>
+                </div>
+            </mat-card>
+        </ng-container>
+    </div>
+
+    <div *ngIf="downloads && !downloadsValid()">
+        <h4 style="text-align: center;" i18n="No downloads label">No downloads available!</h4>
+    </div>
+</div>

src/app/components/downloads/downloads.component.spec.ts

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

src/app/components/downloads/downloads.component.ts

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+import { Component, OnInit, ViewChildren, QueryList, ElementRef } from '@angular/core';
+import { PostsService } from 'app/posts.services';
+import { trigger, transition, animateChild, stagger, query, style, animate } from '@angular/animations';
+
+@Component({
+  selector: 'app-downloads',
+  templateUrl: './downloads.component.html',
+  styleUrls: ['./downloads.component.scss'],
+  animations: [
+    // nice stagger effect when showing existing elements
+    trigger('list', [
+      transition(':enter', [
+        // child animation selector + stagger
+        query('@items',
+          stagger(100, animateChild()), { optional: true }
+        )
+      ]),
+    ]),
+    trigger('items', [
+      // cubic-bezier for a tiny bouncing feel
+      transition(':enter', [
+        style({ transform: 'scale(0.5)', opacity: 0 }),
+        animate('500ms cubic-bezier(.8,-0.6,0.2,1.5)',
+          style({ transform: 'scale(1)', opacity: 1 }))
+      ]),
+      transition(':leave', [
+        style({ transform: 'scale(1)', opacity: 1, height: '*' }),
+        animate('1s cubic-bezier(.8,-0.6,0.2,1.5)',
+          style({ transform: 'scale(0.5)', opacity: 0, height: '0px', margin: '0px' }))
+      ]),
+    ])
+  ],
+})
+export class DownloadsComponent implements OnInit {
+
+  downloads_check_interval = 500;
+  downloads = null;
+
+  keys = Object.keys;
+
+  valid_sessions_length = 0;
+
+  constructor(public postsService: PostsService) { }
+
+  ngOnInit(): void {
+    this.getCurrentDownloads();
+    setInterval(() => {
+      this.getCurrentDownloads();
+    }, this.downloads_check_interval);
+  }
+
+  getCurrentDownloads() {
+    this.postsService.getCurrentDownloads().subscribe(res => {
+      if (res['downloads']) {
+        if (JSON.stringify(this.downloads) !== JSON.stringify(res['downloads'])) {
+          // if they're not the same, then replace
+          this.downloads = res['downloads'];
+        }
+      } else {
+        // failed to get downloads
+      }
+    });
+  }
+
+  clearDownload(session_id, download_uid) {
+    this.postsService.clearDownloads(false, session_id, download_uid).subscribe(res => {
+      if (res['success']) {
+        this.downloads = res['downloads'];
+      } else {
+      }
+    });
+  }
+
+  clearDownloads(session_id) {
+    this.postsService.clearDownloads(false, session_id).subscribe(res => {
+      if (res['success']) {
+        this.downloads = res['downloads'];
+      } else {
+      }
+    });
+  }
+
+  clearAllDownloads() {
+    this.postsService.clearDownloads(true).subscribe(res => {
+      if (res['success']) {
+        this.downloads = res['downloads'];
+      } else {
+      }
+    });
+  }
+
+  downloadsValid() {
+    let valid = false;
+    const keys = this.keys(this.downloads);
+    for (let i = 0; i < keys.length; i++) {
+      const key = keys[i];
+      const value = this.downloads[key];
+      if (this.keys(value).length > 0) {
+        valid = true;
+        break;
+      }
+    }
+    return valid;
+  }
+
+}