Convert Base 64 String to BytesIO

Question

Thanks to anyone that can help with this, its my first question so hopefully it's not super obvious.

I Have an image that's being passed as a base64 string (using slim image cropper). I want to convert that to a file then send it to Google Storage as a blob.

Previously I've been just sending the file like below

image = request.files.get('image')
client = _get_storage_client()
bucket = client.bucket(current_app.config['CLOUD_STORAGE_BUCKET'])
blob = bucket.blob(filename)

blob.upload_from_string(
    image.read(),
    content_type=content_type)

Now I'm dealing with the below code.

cropped_image = json.loads(request.form.get('slim[]'))
data = cropped_image['output']['image']

data variable is a string:

data = 'data:image/jpeg;base64,/9j/4AAQSkZJRgABAQAAAQABAAD/2wBD...'

i'm stuck not sure if I need to encode to base64, decode from base64, turn it to a bytestring then encode/decode??

I've tried just sending it as is using bytesIO and StringIO

image = BytesIO(data)
blob.upload_from_string(
    image.read(),
    content_type=content_type)

and I get a black picture uploaded, really try to not ask questions without researching first but this one has me stumped.

Thanks.

Answer 1

re.sub("data:image/jpeg;base64,", '', b64_str).decode("base64") works in Python2. In Py 2, the str is bytes actually.

UPDATE

from base64 import b64decode

with open("test.jpeg", 'wb') as f:
    f.write(b64decode(re.sub("data:image/jpeg;base64,", '', b64_str)))

# or

image = BytesIO(b64decode(re.sub("data:image/jpeg;base64", '', b64_str)))