A POST request handler to parse and receive a PNG image

handleImagePostRequest.py

def deal_post_data(self):
    ctype, pdict = cgi.parse_header(self.headers['Content-Type'])
    pdict['boundary'] = bytes(pdict['boundary'], "utf-8")
    pdict['CONTENT-LENGTH'] = int(self.headers['Content-Length'])
    if ctype == 'multipart/form-data':
        form = cgi.FieldStorage( fp=self.rfile, headers=self.headers, environ={'REQUEST_METHOD':'POST', 'CONTENT_TYPE':self.headers['Content-Type'], })
        # typeOfImage = form["Type"].value + '.png'
        bbox = {
            'x':int(form["x"].value),
            'y':int(form["y"].value),
            'width':int(form["width"].value),
            'height':int(form["height"].value)
        }
        try:
            byteThings = b""
            if isinstance(form["file"], list):
                for record in form["file"]:
                    #open("./%s"%name, "wb").write(record.file.read())
                    byteThings += record.file.read()
            else:
                #open("./%s"%name, "wb").write(form["file"].file.read())
                byteThings += form["file"].file.read()
            nparr = np.fromstring(byteThings, np.uint8)
            img = cv2.imdecode(nparr, cv2.IMREAD_COLOR)
            cropped_img = processor.crop(img,bbox['x'],bbox['width'],bbox['y'],bbox['height'])
            processor.set_image(form["Type"].value,cropped_img)

        except IOError:
                return (False, "Can't create file to write, do you have permission to write?")
    return (True, "Files uploaded",form["Type"].value)

def do_POST(self):        
    r, info,typeOfImage = self.deal_post_data()
    print(r, info, "by: ", self.client_address)
    processor.processImage(typeOfImage)
    f = io.BytesIO()
    message = ''
    if r:
        self.send_response(200)
        self.end_headers()
        message = processor.message()
    else:
        self.send_response(500)
        self.end_headers()
        message = 'error'
    f.write(message.encode())
    self.wfile.write(f.getvalue())
    f.close()