# documentação Django 4.0.8.dev20220803071047

# Código fonte para django.core.files.uploadedfile

    """
    Classes representing uploaded files.
    """

    import os
    from io import BytesIO

    from django.conf import settings
    from django.core.files import temp as tempfile
    from django.core.files.base import File
    from django.core.files.utils import validate_file_name

    __all__ = (
        "UploadedFile",
        "TemporaryUploadedFile",
        "InMemoryUploadedFile",
        "SimpleUploadedFile",
    )

    class UploadedFile(File):
        """
        An abstract uploaded file (``TemporaryUploadedFile`` and
        ``InMemoryUploadedFile`` are the built-in concrete subclasses).

        An ``UploadedFile`` object behaves somewhat like a file object and
        represents some file data that the user submitted with a form.
        """

        def __init__(
            self,
            file=None,
            name=None,
            content_type=None,
            size=None,
            charset=None,
            content_type_extra=None,
        ):
            super().__init__(file, name)
            self.size = size
            self.content_type = content_type
            self.charset = charset
            self.content_type_extra = content_type_extra

        def __repr__(self):
            return "<%s: %s (%s)>" % (self.__class__.__name__, self.name, self.content_type)

        def _get_name(self):
            return self._name

        def _set_name(self, name):
            # Sanitize the file name so that it can't be dangerous.
            if name is not None:
                # Just use the basename of the file -- anything else is dangerous.
                name = os.path.basename(name)

                # File names longer than 255 characters can cause problems on older OSes.
                if len(name) > 255:
                    name, ext = os.path.splitext(name)
                    ext = ext[:255]
                    name = name[: 255 - len(ext)] + ext

                name = validate_file_name(name)

            self._name = name

        name = property(_get_name, _set_name)

    class TemporaryUploadedFile(UploadedFile):
        """
        A file uploaded to a temporary location (i.e. stream-to-disk).
        """

        def __init__(self, name, content_type, size, charset, content_type_extra=None):
            _, ext = os.path.splitext(name)
            file = tempfile.NamedTemporaryFile(
                suffix=".upload" + ext, dir=settings.FILE_UPLOAD_TEMP_DIR
            )
            super().__init__(file, name, content_type, size, charset, content_type_extra)

        def temporary_file_path(self):
            """Return the full path of this file."""
            return self.file.name

        def close(self):
            try:
                return self.file.close()
            except FileNotFoundError:
                # The file was moved or deleted before the tempfile could unlink
                # it. Still sets self.file.close_called and calls
                # self.file.file.close() before the exception.
                pass

    class InMemoryUploadedFile(UploadedFile):
        """
        A file uploaded into memory (i.e. stream-to-memory).
        """

        def __init__(
            self,
            file,
            field_name,
            name,
            content_type,
            size,
            charset,
            content_type_extra=None,
        ):
            super().__init__(file, name, content_type, size, charset, content_type_extra)
            self.field_name = field_name

        def open(self, mode=None):
            self.file.seek(0)
            return self

        def chunks(self, chunk_size=None):
            self.file.seek(0)
            yield self.read()

        def multiple_chunks(self, chunk_size=None):
            # Since it's in memory, we'll never have multiple chunks.
            return False

    class SimpleUploadedFile(InMemoryUploadedFile):
        """
        A simple representation of a file, which just has content, size, and a name.
        """

        def __init__(self, name, content, content_type="text/plain"):
            content = content or b""
            super().__init__(
                BytesIO(content), None, name, content_type, len(content), None, None
            )

        @classmethod
        def from_dict(cls, file_dict):
            """
            Create a SimpleUploadedFile object from a dictionary with keys:
               - filename
               - content-type
               - content
            """
            return cls(
                file_dict["filename"],
                file_dict["content"],
                file_dict.get("content-type", "text/plain"),
            )