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from typing import Optional
from pantomime.parse import MIMEType
from pantomime.types import DEFAULT, PLAIN
def parse_mimetype(text: Optional[str], default: str = DEFAULT) -> MIMEType:
"""Parse a MIME type into a structured object."""
return MIMEType.parse(text, default=default)
def normalize_mimetype(text: Optional[str], default: str = DEFAULT) -> str:
"""Normalize the spelling of a MIME type."""
return parse_mimetype(text, default=default).normalized or default
def useful_mimetype(text: Optional[str]) -> bool:
"""Check to see if the given mime type is a MIME type
which is useful in terms of how to treat this file.
"""
mimetype = normalize_mimetype(text)
return mimetype not in [DEFAULT, PLAIN, None]
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