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""" Some helper functions for validation of ports and lists of ports. """
def check_port(port):
""" Check if a port is valid. Return an error message indicating what is invalid if something isn't valid. """
if isinstance(port, int):
if port not in range(0, 65535):
return 'Source port must in range from 0 to 65535'
else:
return 'Source port must be an integer'
return None
def check_port_and_port_list(port, port_list):
""" Take in a port and a port list and check that at most one is non-null. Additionally check that if either
is non-null, it is valid.
Return an error message indicating what is invalid if something isn't valid.
"""
if port is not None and port_list is not None:
return'Cannot specify both a source port and a source port list'
elif port is not None:
if isinstance(port, int):
if port not in range(0, 65535):
return 'Source port must in range from 0 to 65535'
else:
return 'Source port must be an integer'
elif port_list is not None:
try:
_ = iter(port_list)
except TypeError:
return 'Source port list must be an iterable {}'.format(port_list)
for candidate_port in port_list:
err = check_port(candidate_port)
if err:
return err
return None
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