Method __init__

django/http/multipartparser.py:58–115

Initialize the MultiPartParser object. :META: The standard ``META`` dictionary in Django request objects. :input_data: The raw post data, as a file-like object. :upload_handlers: A list of UploadHandler instances that perform oper

(self, META, input_data, upload_handlers, encoding=None)

    boundary_re = _lazy_re_compile(r"[ -~]{0,200}[!-~]")

    def __init__(self, META, input_data, upload_handlers, encoding=None):
        """
        Initialize the MultiPartParser object.

        :META:
            The standard ``META`` dictionary in Django request objects.
        :input_data:
            The raw post data, as a file-like object.
        :upload_handlers:
            A list of UploadHandler instances that perform operations on the
            uploaded data.
        :encoding:
            The encoding with which to treat the incoming data.
        """
        # Content-Type should contain multipart and the boundary information.
        content_type = META.get("CONTENT_TYPE", "")
        if not content_type.startswith("multipart/"):
            raise MultiPartParserError("Invalid Content-Type: %s" % content_type)

        try:
            content_type.encode("ascii")
        except UnicodeEncodeError:
            raise MultiPartParserError(
                "Invalid non-ASCII Content-Type in multipart: %s"
                % force_str(content_type)
            )

        # Parse the header to get the boundary to split the parts.
        _, opts = parse_header_parameters(content_type)
        boundary = opts.get("boundary")
        if not boundary or not self.boundary_re.fullmatch(boundary):
            raise MultiPartParserError(
                "Invalid boundary in multipart: %s" % force_str(boundary)
            )

        # Content-Length should contain the length of the body we are about
        # to receive.
        try:
            content_length = int(META.get("CONTENT_LENGTH", 0))
        except (ValueError, TypeError):
            content_length = 0

        if content_length < 0:
            # This means we shouldn't continue...raise an error.
            raise MultiPartParserError("Invalid content length: %r" % content_length)

        self._boundary = boundary.encode("ascii")
        self._input_data = input_data

        # For compatibility with low-level network APIs (with 32-bit integers),
        # the chunk size should be < 2^31, but still divisible by 4.
        possible_sizes = [x.chunk_size for x in upload_handlers if x.chunk_size]
        self._chunk_size = min([2**31 - 4, *possible_sizes])

        self._meta = META
        self._encoding = encoding or settings.DEFAULT_CHARSET
        self._content_length = content_length
        self._upload_handlers = upload_handlers