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fields_base.py
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fields_base.py
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import re
def is_string(val):
return type(val) == str or type(val) == unicode
def string_in_0_to_255(val):
n = int(val)
return 0 <= n <= 255
def satisfies_min(have, want):
return want is None or have >= want
def satisfies_max(have, want):
return want is None or have <= want
def is_numeric_only(val):
return re.match("^[0-9]+$", val)
def validate_ipv4(val):
if not is_string(val): raise ValueError("Value must be supplied as a string")
components = val.split('.')
if len(components) != 4 or not all(string_in_0_to_255(c) for c in components):
raise ValueError("IPv4 address must be passed in as string of type x.y.z.w")
def validate_label(c):
if not c:
raise ValueError("Host name cannot be empty")
if len(c) > 63:
raise ValueError("Host name cannot be more than 63 characters")
if is_numeric_only(c):
raise ValueError("Host name cannot contain only numbers")
if c.startswith("-") or c.endswith("-"):
raise ValueError("Host name cannot start or end with dash '-'")
if not re.match("^[0-9A-Za-z\-]+", c):
raise ValueError("Host name can contain only a-z A-Z 0-9 and dash '-'")
def validate_hostname(val):
if not is_string(val): raise ValueError("Value must be supplied as a string")
components = val.split(".")
if val.endswith("."):
components = components[:-1]
for c in components:
validate_label(c)
class ReadPassThroughField(object):
def __get__(self, obj, objtype):
return self.value
class DefaultValueField(object):
def __init__(self, default=None, **kw):
if default is not None:
self.value = default
super(DefaultValueField, self).__init__(**kw)
class IntegerField(ReadPassThroughField, DefaultValueField):
def __init__(self, signed=None, unsigned=None, **kw):
super(IntegerField, self).__init__(**kw)
if signed is not None:
self.max = (2 ** (signed - 1)) - 1
if unsigned is not None:
self.max = (2 ** unsigned) - 1
def __set__(self, obj, val):
if 0 <= val <= self.max:
self.value = val
else:
raise ValueError("Value %s out of range (max: %s)" % (val, self.max))
class ChoiceField(object):
allowed = []
def __init__(self, *allowed):
self.allowed = allowed
def __set__(self, obj, val):
if val in self.allowed:
self.value = val
else:
raise ValueError("Value %s is not in %s" % (val, self.allowed))