validators.py 文件源码

def validate_pdf(value):
    """
    Validates the uploading file if it is a PDF.
    Raises an error if validation not passed.

    :param value: The file object.
    """
    try:
        PyPDF2.PdfFileReader(io.BytesIO(value.read()))
    except PyPDF2.utils.PdfReadError:
        raise ValidationError('Tried to upload not PDF as a book!')