Add video image components

client/src/app/videos/+video-edit/shared/video-image.component.html

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+<div class="root">
+  <div>
+    <div class="button-file">
+      <span>{{ inputLabel }}</span>
+      <input
+        type="file"
+        [name]="inputName" [id]="inputName" [accept]="videoImageExtensions"
+        (change)="fileChange($event)"
+      />
+    </div>
+    <div class="image-constraints">(extensions: {{ videoImageExtensions }}, max size: {{ maxVideoImageSize | bytes }})</div>
+  </div>
+
+  <img *ngIf="imageSrc" [ngStyle]="{ width: previewWidth, height: previewHeight }" [src]="imageSrc" class="preview" />
+  <div *ngIf="!imageSrc" [ngStyle]="{ width: previewWidth, height: previewHeight }" class="preview no-image"></div>
+</div>

client/src/app/videos/+video-edit/shared/video-image.component.scss

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+@import '_variables';
+@import '_mixins';
+
+.root {
+  height: 150px;
+  display: flex;
+  align-items: center;
+
+  .button-file {
+    @include peertube-button-file(190px);
+  }
+
+  .image-constraints {
+    font-size: 13px;
+  }
+
+  .preview {
+    border: 2px solid grey;
+    border-radius: 4px;
+    margin-left: 50px;
+
+    &.no-image {
+      background-color: #ececec;
+    }
+  }
+}

client/src/app/videos/+video-edit/shared/video-image.component.ts

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+import { Component, forwardRef, Input } from '@angular/core'
+import { ControlValueAccessor, NG_VALUE_ACCESSOR } from '@angular/forms'
+import { DomSanitizer, SafeResourceUrl } from '@angular/platform-browser'
+import { ServerService } from '@app/core'
+import 'rxjs/add/observable/forkJoin'
+
+@Component({
+  selector: 'my-video-image',
+  styleUrls: [ './video-image.component.scss' ],
+  templateUrl: './video-image.component.html',
+  providers: [
+    {
+      provide: NG_VALUE_ACCESSOR,
+      useExisting: forwardRef(() => VideoImageComponent),
+      multi: true
+    }
+  ]
+})
+
+export class VideoImageComponent implements ControlValueAccessor {
+  @Input() inputLabel: string
+  @Input() inputName: string
+  @Input() previewWidth: string
+  @Input() previewHeight: string
+
+  imageSrc: SafeResourceUrl
+
+  private file: Blob
+
+  constructor (
+    private sanitizer: DomSanitizer,
+    private serverService: ServerService
+  ) {}
+
+  get videoImageExtensions () {
+    return this.serverService.getConfig().video.image.extensions.join(',')
+  }
+
+  get maxVideoImageSize () {
+    return this.serverService.getConfig().video.image.size.max
+  }
+
+  fileChange (event: any) {
+    if (event.target.files && event.target.files.length) {
+      const [ file ] = event.target.files
+
+      this.file = file
+      this.propagateChange(this.file)
+      this.updatePreview()
+    }
+  }
+
+  propagateChange = (_: any) => { /* empty */ }
+
+  writeValue (file: any) {
+    this.file = file
+    this.updatePreview()
+  }
+
+  registerOnChange (fn: (_: any) => void) {
+    this.propagateChange = fn
+  }
+
+  registerOnTouched () {
+    // Unused
+  }
+
+  private updatePreview () {
+    if (this.file) {
+      const url = URL.createObjectURL(this.file)
+      this.imageSrc = this.sanitizer.bypassSecurityTrustResourceUrl(url)
+    }
+  }
+}