diff --git a/synapse/rest/media/v1/media_repository.py b/synapse/rest/media/v1/media_repository.py
index bdffa97805..8569677355 100644
--- a/synapse/rest/media/v1/media_repository.py
+++ b/synapse/rest/media/v1/media_repository.py
@@ -444,6 +444,9 @@ class MediaRepository(object):
)
return
+ if thumbnailer.transpose_method is not None:
+ m_width, m_height = thumbnailer.transpose()
+
if t_method == "crop":
t_byte_source = thumbnailer.crop(t_width, t_height, t_type)
elif t_method == "scale":
@@ -578,6 +581,12 @@ class MediaRepository(object):
)
return
+ if thumbnailer.transpose_method is not None:
+ m_width, m_height = yield logcontext.defer_to_thread(
+ self.hs.get_reactor(),
+ thumbnailer.transpose
+ )
+
# We deduplicate the thumbnail sizes by ignoring the cropped versions if
# they have the same dimensions of a scaled one.
thumbnails = {}
diff --git a/synapse/rest/media/v1/thumbnailer.py b/synapse/rest/media/v1/thumbnailer.py
index a4b26c2587..3efd0d80fc 100644
--- a/synapse/rest/media/v1/thumbnailer.py
+++ b/synapse/rest/media/v1/thumbnailer.py
@@ -20,6 +20,17 @@ import PIL.Image as Image
logger = logging.getLogger(__name__)
+EXIF_ORIENTATION_TAG = 0x0112
+EXIF_TRANSPOSE_MAPPINGS = {
+ 2: Image.FLIP_LEFT_RIGHT,
+ 3: Image.ROTATE_180,
+ 4: Image.FLIP_TOP_BOTTOM,
+ 5: Image.TRANSPOSE,
+ 6: Image.ROTATE_270,
+ 7: Image.TRANSVERSE,
+ 8: Image.ROTATE_90
+}
+
class Thumbnailer(object):
@@ -31,6 +42,30 @@ class Thumbnailer(object):
def __init__(self, input_path):
self.image = Image.open(input_path)
self.width, self.height = self.image.size
+ self.transpose_method = None
+ try:
+ # We don't use ImageOps.exif_transpose since it crashes with big EXIF
+ image_exif = self.image._getexif()
+ if image_exif is not None:
+ image_orientation = image_exif.get(EXIF_ORIENTATION_TAG)
+ self.transpose_method = EXIF_TRANSPOSE_MAPPINGS.get(image_orientation)
+ except Exception as e:
+ # A lot of parsing errors can happen when parsing EXIF
+ logger.info("Error parsing image EXIF information: %s", e)
+
+ def transpose(self):
+ """Transpose the image using its EXIF Orientation tag
+
+ Returns:
+ Tuple[int, int]: (width, height) containing the new image size in pixels.
+ """
+ if self.transpose_method is not None:
+ self.image = self.image.transpose(self.transpose_method)
+ self.width, self.height = self.image.size
+ self.transpose_method = None
+ # We don't need EXIF any more
+ self.image.info["exif"] = None
+ return self.image.size
def aspect(self, max_width, max_height):
"""Calculate the largest size that preserves aspect ratio which
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