Wire up attachment saving

js/views/attachment_view.js

@@ -119,13 +119,13 @@
 
       const props = {
         imageURL: this.objectUrl,
+        save: () => this.saveFile(),
+        // implicit: `close`
       };
       this.lightboxView = new Whisper.ReactWrapperView({
         Component: Signal.Components.Lightbox,
         props,
-        onClose: () => {
-          Signal.Backbone.Views.Lightbox.hide();
-        },
+        onClose: () => Signal.Backbone.Views.Lightbox.hide(),
       });
       Signal.Backbone.Views.Lightbox.show(this.lightboxView.el);
     },

ts/components/Lightbox.tsx

@@ -7,7 +7,7 @@ import classNames from 'classnames';
 
 interface Props {
   imageURL?: string;
-  onClose: () => void;
+  save: () => void;
   close: () => void;
 }
 
@@ -64,7 +64,7 @@ export class Lightbox extends React.Component<Props, {}> {
         </div>
         <div style={styles.controls}>
           <IconButton type="close" onClick={this.props.close} />
-          <IconButton type="save" />
+          <IconButton type="save" onClick={this.props.save} />
         </div>
       </div>
     );