Parse multipart data

import io
import cgi
import base64


from urllib.parse import unquote, parse_qs


def parse_form_data(event):
    body = base64.b64decode(event['body'])
    fp = io.BytesIO(body)

    pdict = cgi.parse_header(event['headers']['Content-Type'])[1]
    if 'boundary' in pdict:
        pdict['boundary'] = pdict['boundary'].encode('utf-8')
    pdict['CONTENT-LENGTH'] = len(body)
    return cgi.parse_multipart(fp, pdict)


# На фронтенде передавал картинку через FormData
# const formData = new FormData();
# formData.append('image', image);
def process(event):
    form_data = parse_form_data(event)
    # Bytearray, который можем записать в файлик - получим картинку
    image = form_data['image'][0]

    s3_bucket.put_object(
        Key=f"avatars/{avatar_url}",
        Body=image,
        ContentType="image/${extension}",
    )