# Source code for scrapy.utils.curl

    import argparse
    import warnings
    from shlex import split
    from http.cookies import SimpleCookie
    from urllib.parse import urlparse

    from w3lib.http import basic_auth_header

    class CurlParser(argparse.ArgumentParser):
        def error(self, message):
            error_msg = f'There was an error parsing the curl command: {message}'
            raise ValueError(error_msg)

    curl_parser = CurlParser()
    curl_parser.add_argument('url')
    curl_parser.add_argument('-H', '--header', dest='headers', action='append')
    curl_parser.add_argument('-X', '--request', dest='method')
    curl_parser.add_argument('-d', '--data', '--data-raw', dest='data')
    curl_parser.add_argument('-u', '--user', dest='auth')

    safe_to_ignore_arguments = [
        ['--compressed'],
        # `--compressed` argument is not safe to ignore, but it's included here
        # because the `HttpCompressionMiddleware` is enabled by default
        ['-s', '--silent'],
        ['-v', '--verbose'],
        ['-#', '--progress-bar']
    ]

    for argument in safe_to_ignore_arguments:
        curl_parser.add_argument(*argument, action='store_true')

    def _parse_headers_and_cookies(parsed_args):
        headers = []
        cookies = {}
        for header in parsed_args.headers or ():
            name, val = header.split(':', 1)
            name = name.strip()
            val = val.strip()
            if name.title() == 'Cookie':
                for name, morsel in SimpleCookie(val).items():
                    cookies[name] = morsel.value
            else:
                headers.append((name, val))

        if parsed_args.auth:
            user, password = parsed_args.auth.split(':', 1)
            headers.append(('Authorization', basic_auth_header(user, password)))

        return headers, cookies

    def curl_to_request_kwargs(curl_command, ignore_unknown_options=True):
        """Convert a cURL command syntax to Request kwargs.

        :param str curl_command: string containing the curl command
        :param bool ignore_unknown_options: If true, only a warning is emitted when
                                            cURL options are unknown. Otherwise
                                            raises an error. (default: True)
        :return: dictionary of Request kwargs
        """

        curl_args = split(curl_command)

        if curl_args[0] != 'curl':
            raise ValueError('A curl command must start with "curl"')

        parsed_args, argv = curl_parser.parse_known_args(curl_args[1:])

        if argv:
            msg = f'Unrecognized options: {", ".join(argv)}'
            if ignore_unknown_options:
                warnings.warn(msg)
            else:
                raise ValueError(msg)

        url = parsed_args.url

        # curl automatically prepends 'http' if the scheme is missing, but Request
        # needs the scheme to work
        parsed_url = urlparse(url)
        if not parsed_url.scheme:
            url = 'http://' + url

        method = parsed_args.method or 'GET'

        result = {'method': method.upper(), 'url': url}

        headers, cookies = _parse_headers_and_cookies(parsed_args)

        if headers:
            result['headers'] = headers
        if cookies:
            result['cookies'] = cookies
        if parsed_args.data:
            result['body'] = parsed_args.data
            if not parsed_args.method:
                # if the "data" is specified but the "method" is not specified,
                # the default method is 'POST'
                result['method'] = 'POST'

        return result