Source code for zope.publisher.base

##############################################################################
#
# Copyright (c) 2001, 2002 Zope Foundation and Contributors.
# All Rights Reserved.
#
# This software is subject to the provisions of the Zope Public License,
# Version 2.1 (ZPL).  A copy of the ZPL should accompany this distribution.
# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
# FOR A PARTICULAR PURPOSE.
#
##############################################################################
"""Base implementations of the Publisher objects

Specifically, 'BaseRequest', 'BaseResponse', and 'DefaultPublication' are
specified here.
"""
from io import BytesIO, StringIO

from zope.interface import implementer
from zope.interface.common.mapping import IReadMapping, IEnumerableMapping
from zope.exceptions.exceptionformatter import print_exception
from zope.security.proxy import removeSecurityProxy

from zope.publisher.interfaces import IPublication, IHeld
from zope.publisher.interfaces import NotFound, DebugError, Unauthorized
from zope.publisher.interfaces import IRequest, IResponse, IDebugFlags
from zope.publisher.publish import mapply

from zope.publisher._compat import PYTHON2

_marker = object()

@implementer(IResponse)
[docs]class BaseResponse(object): """Base Response Class """ __slots__ = ( '_result', # The result of the application call '_request', # The associated request (if any) ) def __init__(self): self._request = None
[docs] def setResult(self, result): 'See IPublisherResponse' self._result = result
[docs] def handleException(self, exc_info): 'See IPublisherResponse' # We want exception to be formatted to native strings. Pick # respective io class depending on python version. f = BytesIO() if PYTHON2 else StringIO() print_exception( exc_info[0], exc_info[1], exc_info[2], 100, f) self.setResult(f.getvalue())
[docs] def internalError(self): 'See IPublisherResponse' pass
[docs] def reset(self): 'See IPublisherResponse' pass
[docs] def retry(self): 'See IPublisherResponse' return self.__class__()
@implementer(IReadMapping) class RequestDataGetter(object): def __init__(self, request): self.__get = getattr(request, self._gettrname) def __getitem__(self, name): return self.__get(name) def get(self, name, default=None): return self.__get(name, default) def __contains__(self, key): lookup = self.get(key, self) return lookup is not self has_key = __contains__ @implementer(IEnumerableMapping) class RequestDataMapper(object): def __init__(self, request): self.__map = getattr(request, self._mapname) def __getitem__(self, name): return self.__map[name] def get(self, name, default=None): return self.__map.get(name, default) def __contains__(self, key): lookup = self.get(key, self) return lookup is not self has_key = __contains__ def keys(self): return self.__map.keys() def __iter__(self): return iter(self.keys()) def items(self): return self.__map.items() def values(self): return self.__map.values() def __len__(self): return len(self.__map) class RequestDataProperty(object): def __init__(self, gettr_class): self.__gettr_class = gettr_class def __get__(self, request, rclass=None): if request is not None: return self.__gettr_class(request) def __set__(*args): raise AttributeError('Unassignable attribute') class RequestEnvironment(RequestDataMapper): _mapname = '_environ' @implementer(IDebugFlags)
[docs]class DebugFlags(object): """Debugging flags.""" sourceAnnotations = False showTAL = False
@implementer(IRequest)
[docs]class BaseRequest(object): """Represents a publishing request. This object provides access to request data. Request data may vary depending on the protocol used. Request objects are created by the object publisher and will be passed to published objects through the argument name, REQUEST. The request object is a mapping object that represents a collection of variable to value mappings. """ __slots__ = ( '__provides__', # Allow request to directly provide interfaces '_held', # Objects held until the request is closed '_traversed_names', # The names that have been traversed '_last_obj_traversed', # Object that was traversed last '_traversal_stack', # Names to be traversed, in reverse order '_environ', # The request environment variables '_response', # The response '_args', # positional arguments '_body_instream', # input stream '_body', # The request body as a string '_publication', # publication object '_principal', # request principal, set by publication 'interaction', # interaction, set by interaction 'debug', # debug flags 'annotations', # per-package annotations ) environment = RequestDataProperty(RequestEnvironment) def __init__(self, body_instream, environ, response=None, positional=None): self._traversal_stack = [] self._last_obj_traversed = None self._traversed_names = [] self._environ = environ self._args = positional or () if response is None: self._response = self._createResponse() else: self._response = response self._response._request = self self._body_instream = body_instream self._held = () self._principal = None self.debug = DebugFlags() self.interaction = None self.annotations = {} def setPrincipal(self, principal): self._principal = principal principal = property(lambda self: self._principal) def _getPublication(self): 'See IPublisherRequest' return getattr(self, '_publication', None) publication = property(_getPublication)
[docs] def processInputs(self): 'See IPublisherRequest'
# Nothing to do here
[docs] def retry(self): 'See IPublisherRequest' raise TypeError('Retry is not supported')
[docs] def setPublication(self, pub): 'See IPublisherRequest' self._publication = pub
[docs] def supportsRetry(self): 'See IPublisherRequest' return 0
[docs] def traverse(self, obj): 'See IPublisherRequest' publication = self.publication traversal_stack = self._traversal_stack traversed_names = self._traversed_names prev_object = None while True: self._last_obj_traversed = obj if removeSecurityProxy(obj) is not removeSecurityProxy(prev_object): # Invoke hooks (but not more than once). publication.callTraversalHooks(self, obj) if not traversal_stack: # Finished traversal. break prev_object = obj # Traverse to the next step. entry_name = traversal_stack.pop() traversed_names.append(entry_name) obj = publication.traverseName(self, obj, entry_name) return obj
[docs] def close(self): 'See IPublicationRequest' for held in self._held: if IHeld.providedBy(held): held.release() self._held = None self._body_instream = None self._publication = None
[docs] def getPositionalArguments(self): 'See IPublicationRequest' return self._args
def _getResponse(self): return self._response response = property(_getResponse)
[docs] def getTraversalStack(self): 'See IPublicationRequest' return list(self._traversal_stack) # Return a copy
[docs] def hold(self, object): 'See IPublicationRequest' self._held = self._held + (object,)
[docs] def setTraversalStack(self, stack): 'See IPublicationRequest' self._traversal_stack[:] = list(stack)
def _getBodyStream(self): 'See zope.publisher.interfaces.IApplicationRequest' return self._body_instream bodyStream = property(_getBodyStream) def __len__(self): 'See Interface.Common.Mapping.IEnumerableMapping' return len(self.keys())
[docs] def items(self): 'See Interface.Common.Mapping.IEnumerableMapping' result = [] get = self.get for k in self.keys(): result.append((k, get(k))) return result
[docs] def keys(self): 'See Interface.Common.Mapping.IEnumerableMapping' return self._environ.keys()
def __iter__(self): return iter(self.keys())
[docs] def values(self): 'See Interface.Common.Mapping.IEnumerableMapping' result = [] get = self.get for k in self.keys(): result.append(get(k)) return result
def __getitem__(self, key): 'See Interface.Common.Mapping.IReadMapping' result = self.get(key, _marker) if result is _marker: raise KeyError(key) else: return result
[docs] def get(self, key, default=None): 'See Interface.Common.Mapping.IReadMapping' result = self._environ.get(key, _marker) if result is not _marker: return result return default
def __contains__(self, key): 'See Interface.Common.Mapping.IReadMapping' lookup = self.get(key, self) return lookup is not self has_key = __contains__ def _createResponse(self): # Should be overridden by subclasses return BaseResponse() def __bool__(self): # This is here to avoid calling __len__ for boolean tests return True __nonzero__ = __bool__ # Python 2 def __str__(self): L1 = self.items() L1.sort() return "\n".join(map(lambda item: "%s:\t%s" % item, L1)) def _setupPath_helper(self, attr): path = self.get(attr, "/") if path.endswith('/'): # Remove trailing backslash, so that we will not get an empty # last entry when splitting the path. path = path[:-1] self._endswithslash = True else: self._endswithslash = False clean = [] for item in path.split('/'): if not item or item == '.': continue elif item == '..': # try to remove the last name try: del clean[-1] except IndexError: # the list of names was empty, so do nothing and let the # string '..' be placed on the list pass clean.append(item) clean.reverse() self.setTraversalStack(clean) self._path_suffix = None
class TestRequest(BaseRequest): __slots__ = ('_presentation_type', ) def __init__(self, path, body_instream=None, environ=None): if environ is None: environ = {} environ['PATH_INFO'] = path if body_instream is None: body_instream = BytesIO(b'') super(TestRequest, self).__init__(body_instream, environ) @implementer(IPublication)
[docs]class DefaultPublication(object): """A stub publication. This works just like Zope2's ZPublisher. It rejects any name starting with an underscore and any objects (specifically: method) that doesn't have a docstring. """ require_docstrings = True def __init__(self, app): self.app = app def beforeTraversal(self, request): # Lop off leading and trailing empty names stack = request.getTraversalStack() while stack and not stack[-1]: stack.pop() # toss a trailing empty name while stack and not stack[0]: stack.pop(0) # toss a leading empty name request.setTraversalStack(stack) def getApplication(self, request): return self.app def callTraversalHooks(self, request, ob): pass def traverseName(self, request, ob, name, check_auth=1): if name.startswith('_'): raise Unauthorized(name) if hasattr(ob, name): subob = getattr(ob, name) else: try: subob = ob[name] except (KeyError, IndexError, TypeError, AttributeError): raise NotFound(ob, name, request) if self.require_docstrings and not getattr(subob, '__doc__', None): raise DebugError(subob, 'Missing or empty doc string') return subob def getDefaultTraversal(self, request, ob): return ob, () def afterTraversal(self, request, ob): pass def callObject(self, request, ob): return mapply(ob, request.getPositionalArguments(), request) def afterCall(self, request, ob): pass def endRequest(self, request, ob): pass def handleException(self, object, request, exc_info, retry_allowed=1): # Let the response handle it as best it can. request.response.reset() request.response.handleException(exc_info)
class TestPublication(DefaultPublication): def traverseName(self, request, ob, name, check_auth=1): if hasattr(ob, name): subob = getattr(ob, name) else: try: subob = ob[name] except (KeyError, IndexError, TypeError, AttributeError): raise NotFound(ob, name, request) return subob