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import codecs
from scrapy.conf import settings
_ENCODING_ALIASES = dict(settings['ENCODING_ALIASES_BASE'])
_ENCODING_ALIASES.update(settings['ENCODING_ALIASES'])
def encoding_exists(encoding, _aliases=_ENCODING_ALIASES):
"""Returns ``True`` if encoding is valid, otherwise returns ``False``"""
try:
codecs.lookup(resolve_encoding(encoding, _aliases))
except LookupError:
return False
return True
def resolve_encoding(alias, _aliases=_ENCODING_ALIASES):
"""Return the encoding the given alias maps to, or the alias as passed if
no mapping is found.
"""
return _aliases.get(alias.lower(), alias)
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