226 lines
7.9 KiB
Python
226 lines
7.9 KiB
Python
import copy
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import logging
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from lxml import etree
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from zeep import exceptions
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from zeep.exceptions import UnexpectedElementError
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from zeep.utils import qname_attr
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from zeep.xsd.const import NotSet, xsi_ns
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from zeep.xsd.context import XmlParserContext
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from zeep.xsd.elements.base import Base
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from zeep.xsd.utils import max_occurs_iter
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logger = logging.getLogger(__name__)
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__all__ = ['Element']
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class Element(Base):
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def __init__(self, name, type_=None, min_occurs=1, max_occurs=1,
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nillable=False, default=None, is_global=False, attr_name=None):
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if name is None:
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raise ValueError("name cannot be None", self.__class__)
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if not isinstance(name, etree.QName):
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name = etree.QName(name)
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self.name = name.localname if name else None
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self.qname = name
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self.type = type_
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self.min_occurs = min_occurs
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self.max_occurs = max_occurs
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self.nillable = nillable
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self.is_global = is_global
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self.default = default
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self.attr_name = attr_name or self.name
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# assert type_
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def __str__(self):
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if self.type:
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return '%s(%s)' % (self.name, self.type.signature())
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return '%s()' % self.name
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def __call__(self, *args, **kwargs):
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instance = self.type(*args, **kwargs)
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if hasattr(instance, '_xsd_type'):
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instance._xsd_elm = self
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return instance
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def __repr__(self):
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return '<%s(name=%r, type=%r)>' % (
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self.__class__.__name__, self.name, self.type)
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def __eq__(self, other):
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return (
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other is not None and
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self.__class__ == other.__class__ and
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self.__dict__ == other.__dict__)
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@property
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def default_value(self):
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value = [] if self.accepts_multiple else self.default
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return value
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def clone(self, name=None, min_occurs=1, max_occurs=1):
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new = copy.copy(self)
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if name:
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if not isinstance(name, etree.QName):
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name = etree.QName(name)
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new.name = name.localname
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new.qname = name
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new.attr_name = new.name
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new.min_occurs = min_occurs
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new.max_occurs = max_occurs
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return new
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def parse(self, xmlelement, schema, allow_none=False, context=None):
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"""Process the given xmlelement. If it has an xsi:type attribute then
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use that for further processing. This should only be done for subtypes
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of the defined type but for now we just accept everything.
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"""
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context = context or XmlParserContext()
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instance_type = qname_attr(xmlelement, xsi_ns('type'))
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xsd_type = None
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if instance_type:
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xsd_type = schema.get_type(instance_type, fail_silently=True)
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xsd_type = xsd_type or self.type
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return xsd_type.parse_xmlelement(
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xmlelement, schema, allow_none=allow_none, context=context)
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def parse_kwargs(self, kwargs, name, available_kwargs):
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return self.type.parse_kwargs(
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kwargs, name or self.attr_name, available_kwargs)
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def parse_xmlelements(self, xmlelements, schema, name=None, context=None):
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"""Consume matching xmlelements and call parse() on each of them"""
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result = []
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num_matches = 0
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for _unused in max_occurs_iter(self.max_occurs):
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if not xmlelements:
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break
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# Workaround for SOAP servers which incorrectly use unqualified
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# or qualified elements in the responses (#170, #176). To make the
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# best of it we compare the full uri's if both elements have a
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# namespace. If only one has a namespace then only compare the
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# localname.
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# If both elements have a namespace and they don't match then skip
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element_tag = etree.QName(xmlelements[0].tag)
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if (
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element_tag.namespace and self.qname.namespace and
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element_tag.namespace != self.qname.namespace
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):
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break
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# Only compare the localname
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if element_tag.localname == self.qname.localname:
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xmlelement = xmlelements.popleft()
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num_matches += 1
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item = self.parse(
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xmlelement, schema, allow_none=True, context=context)
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if item is not None:
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result.append(item)
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else:
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# If the element passed doesn't match and the current one is
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# not optional then throw an error
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if num_matches == 0 and not self.is_optional:
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raise UnexpectedElementError(
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"Unexpected element %r, expected %r" % (
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element_tag.text, self.qname.text))
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break
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if not self.accepts_multiple:
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result = result[0] if result else None
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return result
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def render(self, parent, value, render_path=None):
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"""Render the value(s) on the parent lxml.Element.
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This actually just calls _render_value_item for each value.
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"""
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if not render_path:
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render_path = [self.qname.localname]
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assert parent is not None
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self.validate(value, render_path)
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if self.accepts_multiple and isinstance(value, list):
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for val in value:
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self._render_value_item(parent, val, render_path)
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else:
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self._render_value_item(parent, value, render_path)
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def _render_value_item(self, parent, value, render_path):
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"""Render the value on the parent lxml.Element"""
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if value is None or value is NotSet:
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if self.is_optional:
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return
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elm = etree.SubElement(parent, self.qname)
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if self.nillable:
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elm.set(xsi_ns('nil'), 'true')
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return
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node = etree.SubElement(parent, self.qname)
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xsd_type = getattr(value, '_xsd_type', self.type)
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if xsd_type != self.type:
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return value._xsd_type.render(node, value, xsd_type, render_path)
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return self.type.render(node, value, None, render_path)
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def validate(self, value, render_path=None):
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"""Validate that the value is valid"""
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if self.accepts_multiple and isinstance(value, list):
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# Validate bounds
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if len(value) < self.min_occurs:
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raise exceptions.ValidationError(
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"Expected at least %d items (minOccurs check)" % self.min_occurs,
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path=render_path)
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elif self.max_occurs != 'unbounded' and len(value) > self.max_occurs:
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raise exceptions.ValidationError(
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"Expected at most %d items (maxOccurs check)" % self.min_occurs,
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path=render_path)
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for val in value:
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self._validate_item(val, render_path)
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else:
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if not self.is_optional and not self.nillable and value in (None, NotSet):
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raise exceptions.ValidationError(
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"Missing element %s" % (self.name), path=render_path)
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self._validate_item(value, render_path)
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def _validate_item(self, value, render_path):
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if self.nillable and value in (None, NotSet):
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return
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try:
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self.type.validate(value, required=True)
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except exceptions.ValidationError as exc:
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raise exceptions.ValidationError(
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"The element %s is not valid: %s" % (self.qname, exc.message),
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path=render_path)
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def resolve_type(self):
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self.type = self.type.resolve()
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def resolve(self):
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self.resolve_type()
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return self
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def signature(self, depth=()):
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if len(depth) > 0 and self.is_global:
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return self.name + '()'
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value = self.type.signature(depth)
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if self.accepts_multiple:
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return '%s[]' % value
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return value
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