Option to send photos as high quality

ts/util/autoOrientImage.ts

@@ -0,0 +1,31 @@
+// Copyright 2018-2021 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import loadImage, { LoadImageOptions } from 'blueimp-load-image';
+import { IMAGE_JPEG } from '../types/MIME';
+import { canvasToBlob } from './canvasToBlob';
+
+const DEFAULT_JPEG_QUALITY = 0.85;
+
+export async function autoOrientImage(blob: Blob): Promise<Blob> {
+  const options: LoadImageOptions = {
+    canvas: true,
+    orientation: true,
+  };
+
+  try {
+    const data = await loadImage(blob, options);
+    const { image } = data;
+    if (image instanceof HTMLCanvasElement) {
+      // We `return await`, instead of just `return`, so we capture the rejection in this
+      // try/catch block. See [this blog post][0] for more background.
+      // [0]: https://jakearchibald.com/2017/await-vs-return-vs-return-await/
+      return await canvasToBlob(image, IMAGE_JPEG, DEFAULT_JPEG_QUALITY);
+    }
+    throw new Error('image not a canvas');
+  } catch (err) {
+    const error = new Error('autoOrientImage: Failed to process image');
+    error.originalError = err;
+    throw error;
+  }
+}