From 7ac8eaba925cb9f3d02bc93717cb3c573fd26ec2 Mon Sep 17 00:00:00 2001
From: Harrison Healey <harrisonmhealey@gmail.com>
Date: Wed, 24 May 2017 10:52:05 -0400
Subject: PLT-6534 Rotated uploaded profile pictures to be upright (#6482)

---
 app/file.go | 29 +++++++++++++++++------------
 1 file changed, 17 insertions(+), 12 deletions(-)

(limited to 'app/file.go')

diff --git a/app/file.go b/app/file.go
index ad58de623..3b7a6860c 100644
--- a/app/file.go
+++ b/app/file.go
@@ -495,30 +495,35 @@ func prepareImage(fileData []byte) (*image.Image, int, int) {
 	}
 
 	// Flip the image to be upright
-	orientation, _ := getImageOrientation(fileData)
+	orientation, _ := getImageOrientation(bytes.NewReader(fileData))
+	img = makeImageUpright(img, orientation)
 
+	return &img, width, height
+}
+
+func makeImageUpright(img image.Image, orientation int) image.Image {
 	switch orientation {
 	case UprightMirrored:
-		img = imaging.FlipH(img)
+		return imaging.FlipH(img)
 	case UpsideDown:
-		img = imaging.Rotate180(img)
+		return imaging.Rotate180(img)
 	case UpsideDownMirrored:
-		img = imaging.FlipV(img)
+		return imaging.FlipV(img)
 	case RotatedCWMirrored:
-		img = imaging.Transpose(img)
+		return imaging.Transpose(img)
 	case RotatedCCW:
-		img = imaging.Rotate270(img)
+		return imaging.Rotate270(img)
 	case RotatedCCWMirrored:
-		img = imaging.Transverse(img)
+		return imaging.Transverse(img)
 	case RotatedCW:
-		img = imaging.Rotate90(img)
+		return imaging.Rotate90(img)
+	default:
+		return img
 	}
-
-	return &img, width, height
 }
 
-func getImageOrientation(imageData []byte) (int, error) {
-	if exifData, err := exif.Decode(bytes.NewReader(imageData)); err != nil {
+func getImageOrientation(input io.Reader) (int, error) {
+	if exifData, err := exif.Decode(input); err != nil {
 		return Upright, err
 	} else {
 		if tag, err := exifData.Get("Orientation"); err != nil {
-- 
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