Parse multipart request string in Python

Question

I have a string like this

\"--5b34210d81fb44c5a0fdc1a1e5ce42c3\\r\\nContent-Disposition: form-data; name=\\\"author\\\"\\r\\n\\r\\nJohn Smith\\r\\n--5b34210d         


        

Answer 1

If you want to use Python's CGI,

from cgi import parse_multipart, parse_header
from io import BytesIO

c_type, c_data = parse_header(event['headers']['Content-Type'])
assert c_type == 'multipart/form-data'
decoded_string = base64.b64decode(event['body'])
#For Python 3: these two lines of bugfixing are mandatory
#see also: https://stackoverflow.com/questions/31486618/cgi-parse-multipart-function-throws-typeerror-in-python-3
c_data['boundary'] = bytes(c_data['boundary'], "utf-8")
c_data['CONTENT-LENGTH'] = event['headers']['Content-length']
form_data = parse_multipart(BytesIO(decoded_string), c_data)

for image_str in form_data['file']:
    ...