def get_hasher(algorithm='default'):
"""
Returns an instance of a loaded password hasher.
If algorithm is 'default', the default hasher will be returned.
This function will also lazy import hashers specified in your
settings file if needed.
"""
if hasattr(algorithm, 'algorithm'):
return algorithm
elif algorithm == 'default':
return get_hashers()[0]
else:
hashers = get_hashers_by_algorithm()
try:
return hashers[algorithm]
except KeyError:
raise ValueError("Unknown password hashing algorithm '%s'. "
"Did you specify it in the PASSWORD_HASHERS "
"setting?" % algorithm)
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