def upload_image(file, filename, bucket, append_timestamp=False,
scale_args=None, uploaded_image_buffer=None, do_not_overwrite=False):
"""
Upload a file directly to S3, should skip saving locally.
Returns the filename that was created.
Prefetch the uploaded_image_buffer for performance gain, when resizing
the same image several times.
"""
# append a timestamp, so images don't overwrite each other
if append_timestamp:
filename = '%s-%s' % (
filename, datetime.now().strftime("%Y%m%d%H%M%S%f"))
# this is a cheat, just appending a random, but should be pretty good
# for preventing overwriting in one request
if do_not_overwrite:
filename += unicode(randint(0, 1000000))
# update the filename, with the file type
filename = '%s.%s' % (filename, file.name.split('.')[-1])
if uploaded_image_buffer:
uploaded_image_buffer.seek(0)
else:
uploaded_image_buffer = read_file_chunks(file)
uploaded_image = Image.open(uploaded_image_buffer)
if scale_args and any(scale_args):
(width, height) = uploaded_image.size
(width, height) = scale_to(
width, height, *scale_args)
resized_image = uploaded_image.resize((width, height))
image_file = StringIO.StringIO()
resized_image.save(image_file, 'JPEG')
else:
image_file = uploaded_image_buffer
image_file.seek(0) # just to make sure
if getattr(settings, 'IS_DEV', False):
with open(os.path.join(
settings.MEDIA_ROOT, filename), 'wb+') as destination_file:
destination_file.write(image_file.read())
else:
upload_to_s3(image_file, os.path.join(
settings.MEDIA_URL, filename), bucket)
return filename
def upload_image_and_resize(
file, name_and_size_tuple, bucket, append_timestamp=False,
do_not_overwrite=False):
"""
Uploads multiple files efficiently.
"""
uploaded_image_buffer = read_file_chunks(file)
files = []
for t in name_and_size_tuple:
file_path = upload_image(file, t[0], bucket,
append_timestamp=append_timestamp, scale_args=t[1:],
uploaded_image_buffer=uploaded_image_buffer,
do_not_overwrite=do_not_overwrite)
files.append(file_path)
return files