"""classes to define schemas for CubicWeb
:organization: Logilab
:copyright: 2001-2009 LOGILAB S.A. (Paris, FRANCE), license is LGPL v2.
:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
:license: GNU Lesser General Public License, v2.1 - http://www.gnu.org/licenses
"""
__docformat__ = "restructuredtext en"
_ = unicode
import re
from os.path import join
from logging import getLogger
from warnings import warn
from logilab.common.decorators import cached, clear_cache, monkeypatch
from logilab.common.logging_ext import set_log_methods
from logilab.common.deprecation import deprecated
from logilab.common.graph import get_cycles
from logilab.common.compat import any
from yams import BadSchemaDefinition, buildobjs as ybo
from yams.schema import Schema, ERSchema, EntitySchema, RelationSchema, \
RelationDefinitionSchema, PermissionMixIn
from yams.constraints import (BaseConstraint, StaticVocabularyConstraint,
FormatConstraint)
from yams.reader import (CONSTRAINTS, PyFileReader, SchemaLoader,
obsolete as yobsolete, cleanup_sys_modules)
from rql import parse, nodes, RQLSyntaxError, TypeResolverException
import cubicweb
from cubicweb import ETYPE_NAME_MAP, ValidationError, Unauthorized
# XXX <3.2 bw compat
from yams import schema
schema.use_py_datetime()
nodes.use_py_datetime()
PURE_VIRTUAL_RTYPES = set(('identity', 'has_text',))
VIRTUAL_RTYPES = set(('eid', 'identity', 'has_text',))
# set of meta-relations available for every entity types
META_RTYPES = set((
'owned_by', 'created_by', 'is', 'is_instance_of', 'identity',
'eid', 'creation_date', 'modification_date', 'has_text', 'cwuri',
))
SYSTEM_RTYPES = set(('require_permission', 'custom_workflow', 'in_state', 'wf_info_for'))
# set of entity and relation types used to build the schema
SCHEMA_TYPES = set((
'CWEType', 'CWRType', 'CWAttribute', 'CWRelation',
'CWConstraint', 'CWConstraintType', 'RQLExpression',
'relation_type', 'from_entity', 'to_entity',
'constrained_by', 'cstrtype',
))
_LOGGER = getLogger('cubicweb.schemaloader')
# schema entities created from serialized schema have an eid rproperty
ybo.ETYPE_PROPERTIES += ('eid',)
ybo.RTYPE_PROPERTIES += ('eid',)
ybo.RDEF_PROPERTIES += ('eid',)
# XXX same algorithm as in reorder_cubes and probably other place,
# may probably extract a generic function
def order_eschemas(eschemas):
"""return entity schemas ordered such that entity types which specializes an
other one appears after that one
"""
graph = {}
for eschema in eschemas:
if eschema.specializes():
graph[eschema] = set((eschema.specializes(),))
else:
graph[eschema] = set()
cycles = get_cycles(graph)
if cycles:
cycles = '\n'.join(' -> '.join(cycle) for cycle in cycles)
raise Exception('cycles in entity schema specialization: %s'
% cycles)
eschemas = []
while graph:
# sorted to get predictable results
for eschema, deps in sorted(graph.items()):
if not deps:
eschemas.append(eschema)
del graph[eschema]
for deps in graph.itervalues():
try:
deps.remove(eschema)
except KeyError:
continue
return eschemas
def bw_normalize_etype(etype):
if etype in ETYPE_NAME_MAP:
msg = '%s has been renamed to %s, please update your code' % (
etype, ETYPE_NAME_MAP[etype])
warn(msg, DeprecationWarning, stacklevel=4)
etype = ETYPE_NAME_MAP[etype]
return etype
def display_name(req, key, form='', context=None):
"""return a internationalized string for the key (schema entity or relation
name) in a given form
"""
assert form in ('', 'plural', 'subject', 'object')
if form == 'subject':
form = ''
if form:
key = key + '_' + form
# ensure unicode
# .lower() in case no translation are available XXX done whatever a translation is there or not!
if context is not None:
return unicode(req.pgettext(context, key)).lower()
else:
return unicode(req._(key)).lower()
__builtins__['display_name'] = deprecated('[3.4] display_name should be imported from cubicweb.schema')(display_name)
# rql expression utilities function ############################################
def guess_rrqlexpr_mainvars(expression):
defined = set(split_expression(expression))
mainvars = []
if 'S' in defined:
mainvars.append('S')
if 'O' in defined:
mainvars.append('O')
if 'U' in defined:
mainvars.append('U')
if not mainvars:
raise Exception('unable to guess selection variables')
return ','.join(mainvars)
def split_expression(rqlstring):
for expr in rqlstring.split(','):
for word in expr.split():
yield word
def normalize_expression(rqlstring):
"""normalize an rql expression to ease schema synchronization (avoid
suppressing and reinserting an expression if only a space has been added/removed
for instance)
"""
return u', '.join(' '.join(expr.split()) for expr in rqlstring.split(','))
# Schema objects definition ###################################################
def ERSchema_display_name(self, req, form='', context=None):
"""return a internationalized string for the entity/relation type name in
a given form
"""
return display_name(req, self.type, form, context)
ERSchema.display_name = ERSchema_display_name
@cached
def get_groups(self, action):
"""return the groups authorized to perform <action> on entities of
this type
:type action: str
:param action: the name of a permission
:rtype: tuple
:return: names of the groups with the given permission
"""
assert action in self.ACTIONS, action
#assert action in self._groups, '%s %s' % (self, action)
try:
return frozenset(g for g in self.permissions[action] if isinstance(g, basestring))
except KeyError:
return ()
PermissionMixIn.get_groups = get_groups
@cached
def get_rqlexprs(self, action):
"""return the rql expressions representing queries to check the user is allowed
to perform <action> on entities of this type
:type action: str
:param action: the name of a permission
:rtype: tuple
:return: the rql expressions with the given permission
"""
assert action in self.ACTIONS, action
#assert action in self._rqlexprs, '%s %s' % (self, action)
try:
return tuple(g for g in self.permissions[action] if not isinstance(g, basestring))
except KeyError:
return ()
PermissionMixIn.get_rqlexprs = get_rqlexprs
orig_set_action_permissions = PermissionMixIn.set_action_permissions
def set_action_permissions(self, action, permissions):
"""set the groups and rql expressions allowing to perform <action> on
entities of this type
:type action: str
:param action: the name of a permission
:type permissions: tuple
:param permissions: the groups and rql expressions allowing the given action
"""
orig_set_action_permissions(self, action, tuple(permissions))
clear_cache(self, 'get_rqlexprs')
clear_cache(self, 'get_groups')
PermissionMixIn.set_action_permissions = set_action_permissions
def has_local_role(self, action):
"""return true if the action *may* be granted localy (eg either rql
expressions or the owners group are used in security definition)
XXX this method is only there since we don't know well how to deal with
'add' action checking. Also find a better name would be nice.
"""
assert action in self.ACTIONS, action
if self.get_rqlexprs(action):
return True
if action in ('update', 'delete'):
return 'owners' in self.get_groups(action)
return False
PermissionMixIn.has_local_role = has_local_role
def may_have_permission(self, action, req):
if action != 'read' and not (self.has_local_role('read') or
self.has_perm(req, 'read')):
return False
return self.has_local_role(action) or self.has_perm(req, action)
PermissionMixIn.may_have_permission = may_have_permission
def has_perm(self, session, action, **kwargs):
"""return true if the action is granted globaly or localy"""
try:
self.check_perm(session, action, **kwargs)
return True
except Unauthorized:
return False
PermissionMixIn.has_perm = has_perm
def check_perm(self, session, action, **kwargs):
# NB: session may be a server session or a request object check user is
# in an allowed group, if so that's enough internal sessions should
# always stop there
groups = self.get_groups(action)
if session.user.matching_groups(groups):
return
# if 'owners' in allowed groups, check if the user actually owns this
# object, if so that's enough
if 'owners' in groups and 'eid' in kwargs and session.user.owns(kwargs['eid']):
return
# else if there is some rql expressions, check them
if any(rqlexpr.check(session, **kwargs)
for rqlexpr in self.get_rqlexprs(action)):
return
raise Unauthorized(action, str(self))
PermissionMixIn.check_perm = check_perm
RelationDefinitionSchema._RPROPERTIES['eid'] = None
def rql_expression(self, expression, mainvars=None, eid=None):
"""rql expression factory"""
if self.rtype.final:
return ERQLExpression(expression, mainvars, eid)
return RRQLExpression(expression, mainvars, eid)
RelationDefinitionSchema.rql_expression = rql_expression
orig_check_permission_definitions = RelationDefinitionSchema.check_permission_definitions
def check_permission_definitions(self):
orig_check_permission_definitions(self)
schema = self.subject.schema
for action, groups in self.permissions.iteritems():
for group_or_rqlexpr in groups:
if action == 'read' and \
isinstance(group_or_rqlexpr, RQLExpression):
msg = "can't use rql expression for read permission of %s"
raise BadSchemaDefinition(msg % self)
elif self.final and isinstance(group_or_rqlexpr, RRQLExpression):
if schema.reading_from_database:
# we didn't have final relation earlier, so turn
# RRQLExpression into ERQLExpression now
rqlexpr = group_or_rqlexpr
newrqlexprs = [x for x in self.get_rqlexprs(action)
if not x is rqlexpr]
newrqlexprs.append(ERQLExpression(rqlexpr.expression,
rqlexpr.mainvars,
rqlexpr.eid))
self.set_rqlexprs(action, newrqlexprs)
else:
msg = "can't use RRQLExpression on %s, use an ERQLExpression"
raise BadSchemaDefinition(msg % self)
elif not self.final and \
isinstance(group_or_rqlexpr, ERQLExpression):
msg = "can't use ERQLExpression on %s, use a RRQLExpression"
raise BadSchemaDefinition(msg % self)
RelationDefinitionSchema.check_permission_definitions = check_permission_definitions
class CubicWebEntitySchema(EntitySchema):
"""a entity has a type, a set of subject and or object relations
the entity schema defines the possible relations for a given type and some
constraints on those relations
"""
def __init__(self, schema=None, edef=None, eid=None, **kwargs):
super(CubicWebEntitySchema, self).__init__(schema, edef, **kwargs)
if eid is None and edef is not None:
eid = getattr(edef, 'eid', None)
self.eid = eid
# take care: no _groups attribute when deep-copying
if getattr(self, 'permissions', None):
for groups in self.permissions.itervalues():
for group_or_rqlexpr in groups:
if isinstance(group_or_rqlexpr, RRQLExpression):
msg = "can't use RRQLExpression on an entity type, use an ERQLExpression (%s)"
raise BadSchemaDefinition(msg % self.type)
def attribute_definitions(self):
"""return an iterator on attribute definitions
attribute relations are a subset of subject relations where the
object's type is a final entity
an attribute definition is a 2-uple :
* name of the relation
* schema of the destination entity type
"""
iter = super(CubicWebEntitySchema, self).attribute_definitions()
for rschema, attrschema in iter:
if rschema.type == 'has_text':
continue
yield rschema, attrschema
def main_attribute(self):
"""convenience method that returns the *main* (i.e. the first non meta)
attribute defined in the entity schema
"""
for rschema, _ in self.attribute_definitions():
if not (rschema in META_RTYPES
or self.is_metadata(rschema)):
return rschema
def add_subject_relation(self, rschema):
"""register the relation schema as possible subject relation"""
super(CubicWebEntitySchema, self).add_subject_relation(rschema)
self._update_has_text()
def del_subject_relation(self, rtype):
super(CubicWebEntitySchema, self).del_subject_relation(rtype)
self._update_has_text(True)
def _update_has_text(self, deletion=False):
may_need_has_text, has_has_text = False, False
need_has_text = None
for rschema in self.subject_relations():
if rschema.final:
if rschema == 'has_text':
has_has_text = True
elif self.rdef(rschema).get('fulltextindexed'):
may_need_has_text = True
elif rschema.fulltext_container:
if rschema.fulltext_container == 'subject':
may_need_has_text = True
else:
need_has_text = False
for rschema in self.object_relations():
if rschema.fulltext_container:
if rschema.fulltext_container == 'object':
may_need_has_text = True
else:
need_has_text = False
if need_has_text is None:
need_has_text = may_need_has_text
if need_has_text and not has_has_text and not deletion:
rdef = ybo.RelationDefinition(self.type, 'has_text', 'String')
self.schema.add_relation_def(rdef)
elif not need_has_text and has_has_text:
self.schema.del_relation_def(self.type, 'has_text', 'String')
def schema_entity(self):
"""return True if this entity type is used to build the schema"""
return self.type in SCHEMA_TYPES
def rql_expression(self, expression, mainvars=None, eid=None):
"""rql expression factory"""
return ERQLExpression(expression, mainvars, eid)
class CubicWebRelationSchema(RelationSchema):
def __init__(self, schema=None, rdef=None, eid=None, **kwargs):
if rdef is not None:
# if this relation is inlined
self.inlined = rdef.inlined
super(CubicWebRelationSchema, self).__init__(schema, rdef, **kwargs)
if eid is None and rdef is not None:
eid = getattr(rdef, 'eid', None)
self.eid = eid
@property
def meta(self):
return self.type in META_RTYPES
def schema_relation(self):
"""return True if this relation type is used to build the schema"""
return self.type in SCHEMA_TYPES
def may_have_permission(self, action, req, eschema=None, role=None):
if eschema is not None:
for tschema in self.targets(eschema, role):
rdef = self.role_rdef(eschema, tschema, role)
if rdef.may_have_permission(action, req):
return True
else:
for rdef in self.rdefs.itervalues():
if rdef.may_have_permission(action, req):
return True
return False
def has_perm(self, session, action, **kwargs):
"""return true if the action is granted globaly or localy"""
if 'fromeid' in kwargs:
subjtype = session.describe(kwargs['fromeid'])[0]
else:
subjtype = None
if 'toeid' in kwargs:
objtype = session.describe(kwargs['toeid'])[0]
else:
objtype = None
if objtype and subjtype:
return self.rdef(subjtype, objtype).has_perm(session, action, **kwargs)
elif subjtype:
for tschema in self.targets(subjtype, 'subject'):
rdef = self.rdef(subjtype, tschema)
if not rdef.has_perm(session, action, **kwargs):
return False
elif objtype:
for tschema in self.targets(objtype, 'object'):
rdef = self.rdef(tschema, objtype)
if not rdef.has_perm(session, action, **kwargs):
return False
else:
for rdef in self.rdefs.itervalues():
if not rdef.has_perm(session, action, **kwargs):
return False
@deprecated('use .rdef(subjtype, objtype).role_cardinality(role)')
def cardinality(self, subjtype, objtype, target):
return self.rdef(subjtype, objtype).role_cardinality(target)
class CubicWebSchema(Schema):
"""set of entities and relations schema defining the possible data sets
used in an application
:type name: str
:ivar name: name of the schema, usually the instance identifier
:type base: str
:ivar base: path of the directory where the schema is defined
"""
reading_from_database = False
entity_class = CubicWebEntitySchema
relation_class = CubicWebRelationSchema
no_specialization_inference = ('identity',)
def __init__(self, *args, **kwargs):
self._eid_index = {}
super(CubicWebSchema, self).__init__(*args, **kwargs)
ybo.register_base_types(self)
rschema = self.add_relation_type(ybo.RelationType('eid'))
rschema.final = True
rschema = self.add_relation_type(ybo.RelationType('has_text'))
rschema.final = True
rschema = self.add_relation_type(ybo.RelationType('identity'))
rschema.final = False
def add_entity_type(self, edef):
edef.name = edef.name.encode()
edef.name = bw_normalize_etype(edef.name)
assert re.match(r'[A-Z][A-Za-z0-9]*[a-z]+[0-9]*$', edef.name), repr(edef.name)
eschema = super(CubicWebSchema, self).add_entity_type(edef)
if not eschema.final:
# automatically add the eid relation to non final entity types
rdef = ybo.RelationDefinition(eschema.type, 'eid', 'Int',
cardinality='11', uid=True)
self.add_relation_def(rdef)
rdef = ybo.RelationDefinition(eschema.type, 'identity', eschema.type)
self.add_relation_def(rdef)
self._eid_index[eschema.eid] = eschema
return eschema
def add_relation_type(self, rdef):
rdef.name = rdef.name.lower().encode()
rschema = super(CubicWebSchema, self).add_relation_type(rdef)
self._eid_index[rschema.eid] = rschema
return rschema
def add_relation_def(self, rdef):
"""build a part of a relation schema
(i.e. add a relation between two specific entity's types)
:type subject: str
:param subject: entity's type that is subject of the relation
:type rtype: str
:param rtype: the relation's type (i.e. the name of the relation)
:type obj: str
:param obj: entity's type that is object of the relation
:rtype: RelationSchema
:param: the newly created or just completed relation schema
"""
rdef.name = rdef.name.lower()
rdef.subject = bw_normalize_etype(rdef.subject)
rdef.object = bw_normalize_etype(rdef.object)
rdefs = super(CubicWebSchema, self).add_relation_def(rdef)
if rdefs:
try:
self._eid_index[rdef.eid] = rdefs
except AttributeError:
pass # not a serialized schema
return rdefs
def del_relation_type(self, rtype):
rschema = self.rschema(rtype)
self._eid_index.pop(rschema.eid, None)
super(CubicWebSchema, self).del_relation_type(rtype)
def del_relation_def(self, subjtype, rtype, objtype):
for k, v in self._eid_index.items():
if not isinstance(v, RelationDefinitionSchema):
continue
if v.subject == subjtype and v.rtype == rtype and v.object == objtype:
del self._eid_index[k]
break
super(CubicWebSchema, self).del_relation_def(subjtype, rtype, objtype)
def del_entity_type(self, etype):
eschema = self.eschema(etype)
self._eid_index.pop(eschema.eid, None)
# deal with has_text first, else its automatic deletion (see above)
# may trigger an error in ancestor's del_entity_type method
if 'has_text' in eschema.subject_relations():
self.del_relation_def(etype, 'has_text', 'String')
super(CubicWebSchema, self).del_entity_type(etype)
def schema_by_eid(self, eid):
return self._eid_index[eid]
# Possible constraints ########################################################
class BaseRQLConstraint(BaseConstraint):
"""base class for rql constraints
"""
def __init__(self, restriction, mainvars=None):
self.restriction = normalize_expression(restriction)
if mainvars is None:
mainvars = guess_rrqlexpr_mainvars(restriction)
else:
normmainvars = []
for mainvar in mainvars.split(','):
mainvar = mainvar.strip()
if not mainvar.isalpha():
raise Exception('bad mainvars %s' % mainvars)
normmainvars.append(mainvar)
assert mainvars, 'bad mainvars %s' % mainvars
mainvars = ','.join(sorted(normmainvars))
self.mainvars = mainvars
def serialize(self):
# start with a comma for bw compat, see below
return ';' + self.mainvars + ';' + self.restriction
def deserialize(cls, value):
# XXX < 3.5.10 bw compat
if not value.startswith(';'):
return cls(value)
_, mainvars, restriction = value.split(';', 2)
return cls(restriction, mainvars)
deserialize = classmethod(deserialize)
def check(self, entity, rtype, value):
"""return true if the value satisfy the constraint, else false"""
# implemented as a hook in the repository
return 1
def repo_check(self, session, eidfrom, rtype, eidto):
"""raise ValidationError if the relation doesn't satisfy the constraint
"""
pass # this is a vocabulary constraint, not enforce XXX why?
def __str__(self):
return '%s(Any %s WHERE %s)' % (self.__class__.__name__, self.mainvars,
self.restriction)
def __repr__(self):
return '<%s @%#x>' % (self.__str__(), id(self))
class RQLVocabularyConstraint(BaseRQLConstraint):
"""the rql vocabulary constraint :
limit the proposed values to a set of entities returned by a rql query,
but this is not enforced at the repository level
restriction is additional rql restriction that will be added to
a predefined query, where the S and O variables respectivly represent
the subject and the object of the relation
mainvars is a string that should be used as selection variable (eg
`'Any %s WHERE ...' % mainvars`). If not specified, an attempt will be
done to guess it according to variable used in the expression.
"""
class RepoEnforcedRQLConstraintMixIn(object):
def __init__(self, restriction, mainvars=None, msg=None):
super(RepoEnforcedRQLConstraintMixIn, self).__init__(restriction, mainvars)
self.msg = msg
def serialize(self):
# start with a semicolon for bw compat, see below
return ';%s;%s\n%s' % (self.mainvars, self.restriction,
self.msg or '')
def deserialize(cls, value):
# XXX < 3.5.10 bw compat
if not value.startswith(';'):
return cls(value)
value, msg = value.split('\n', 1)
_, mainvars, restriction = value.split(';', 2)
return cls(restriction, mainvars, msg)
deserialize = classmethod(deserialize)
def repo_check(self, session, eidfrom, rtype, eidto=None):
"""raise ValidationError if the relation doesn't satisfy the constraint
"""
if not self.match_condition(session, eidfrom, eidto):
# XXX at this point if both or neither of S and O are in mainvar we
# dunno if the validation error `occured` on eidfrom or eidto (from
# user interface point of view)
if eidto is None or 'S' in self.mainvars or not 'O' in self.mainvars:
maineid = eidfrom
else:
maineid = eidto
if self.msg:
msg = session._(self.msg)
else:
msg = '%(constraint)s %(restriction)s failed' % {
'constraint': session._(self.type()),
'restriction': self.restriction}
raise ValidationError(maineid, {rtype: msg})
def exec_query(self, session, eidfrom, eidto):
if eidto is None:
# checking constraint for an attribute relation
restriction = 'S eid %(s)s, ' + self.restriction
args, ck = {'s': eidfrom}, 's'
else:
restriction = 'S eid %(s)s, O eid %(o)s, ' + self.restriction
args, ck = {'s': eidfrom, 'o': eidto}, ('s', 'o')
rql = 'Any %s WHERE %s' % (self.mainvars, restriction)
if self.distinct_query:
rql = 'DISTINCT ' + rql
return session.unsafe_execute(rql, args, ck, build_descr=False)
class RQLConstraint(RepoEnforcedRQLConstraintMixIn, RQLVocabularyConstraint):
"""the rql constraint is similar to the RQLVocabularyConstraint but
are also enforced at the repository level
"""
distinct_query = False
def match_condition(self, session, eidfrom, eidto):
return self.exec_query(session, eidfrom, eidto)
class RQLUniqueConstraint(RepoEnforcedRQLConstraintMixIn, BaseRQLConstraint):
"""the unique rql constraint check that the result of the query isn't
greater than one
"""
distinct_query = True
# XXX turns mainvars into a required argument in __init__, since we've no
# way to guess it correctly (eg if using S,O or U the constraint will
# always be satisfied since we've to use a DISTINCT query)
def match_condition(self, session, eidfrom, eidto):
return len(self.exec_query(session, eidfrom, eidto)) <= 1
class RQLExpression(object):
def __init__(self, expression, mainvars, eid):
self.eid = eid # eid of the entity representing this rql expression
if not isinstance(mainvars, unicode):
mainvars = unicode(mainvars)
self.mainvars = mainvars
self.expression = normalize_expression(expression)
try:
self.rqlst = parse(self.full_rql, print_errors=False).children[0]
except RQLSyntaxError:
raise RQLSyntaxError(expression)
for mainvar in mainvars.split(','):
if len(self.rqlst.defined_vars[mainvar].references()) <= 2:
_LOGGER.warn('You did not use the %s variable in your RQL '
'expression %s', mainvar, self)
# syntax tree used by read security (inserted in queries when necessary)
self.snippet_rqlst = parse(self.minimal_rql, print_errors=False).children[0]
def __str__(self):
return self.full_rql
def __repr__(self):
return '%s(%s)' % (self.__class__.__name__, self.full_rql)
def __cmp__(self, other):
if hasattr(other, 'expression'):
return cmp(other.expression, self.expression)
return -1
def __deepcopy__(self, memo):
return self.__class__(self.expression, self.mainvars)
def __getstate__(self):
return (self.expression, self.mainvars)
def __setstate__(self, state):
self.__init__(*state)
@cached
def transform_has_permission(self):
found = None
rqlst = self.rqlst
for var in rqlst.defined_vars.itervalues():
for varref in var.references():
rel = varref.relation()
if rel is None:
continue
try:
prefix, action, suffix = rel.r_type.split('_')
except ValueError:
continue
if prefix != 'has' or suffix != 'permission' or \
not action in ('add', 'delete', 'update', 'read'):
continue
if found is None:
found = []
rqlst.save_state()
assert rel.children[0].name == 'U'
objvar = rel.children[1].children[0].variable
rqlst.remove_node(rel)
selected = [v.name for v in rqlst.get_selected_variables()]
if objvar.name not in selected:
colindex = len(selected)
rqlst.add_selected(objvar)
else:
colindex = selected.index(objvar.name)
found.append((action, objvar, colindex))
# remove U eid %(u)s if U is not used in any other relation
uvrefs = rqlst.defined_vars['U'].references()
if len(uvrefs) == 1:
rqlst.remove_node(uvrefs[0].relation())
if found is not None:
rql = rqlst.as_string()
if len(rqlst.selection) == 1 and isinstance(rqlst.where, nodes.Relation):
# only "Any X WHERE X eid %(x)s" remaining, no need to execute the rql
keyarg = rqlst.selection[0].name.lower()
else:
keyarg = None
rqlst.recover()
return rql, found, keyarg
return rqlst.as_string(), None, None
def _check(self, session, **kwargs):
"""return True if the rql expression is matching the given relation
between fromeid and toeid
session may actually be a request as well
"""
if self.eid is not None:
key = (self.eid, tuple(sorted(kwargs.iteritems())))
try:
return session.local_perm_cache[key]
except KeyError:
pass
rql, has_perm_defs, keyarg = self.transform_has_permission()
if keyarg is None:
# on the server side, use unsafe_execute, but this is not available
# on the client side (session is actually a request)
execute = getattr(session, 'unsafe_execute', session.execute)
# XXX what if 'u' in kwargs
cachekey = kwargs.keys()
kwargs['u'] = session.user.eid
try:
rset = execute(rql, kwargs, cachekey, build_descr=True)
except NotImplementedError:
self.critical('cant check rql expression, unsupported rql %s', rql)
if self.eid is not None:
session.local_perm_cache[key] = False
return False
except TypeResolverException, ex:
# some expression may not be resolvable with current kwargs
# (type conflict)
self.warning('%s: %s', rql, str(ex))
if self.eid is not None:
session.local_perm_cache[key] = False
return False
else:
rset = session.eid_rset(kwargs[keyarg])
# if no special has_*_permission relation in the rql expression, just
# check the result set contains something
if has_perm_defs is None:
if rset:
if self.eid is not None:
session.local_perm_cache[key] = True
return True
elif rset:
# check every special has_*_permission relation is satisfied
get_eschema = session.vreg.schema.eschema
try:
for eaction, var, col in has_perm_defs:
for i in xrange(len(rset)):
eschema = get_eschema(rset.description[i][col])
eschema.check_perm(session, eaction, eid=rset[i][col])
if self.eid is not None:
session.local_perm_cache[key] = True
return True
except Unauthorized:
pass
if self.eid is not None:
session.local_perm_cache[key] = False
return False
@property
def minimal_rql(self):
return 'Any %s WHERE %s' % (self.mainvars, self.expression)
class ERQLExpression(RQLExpression):
def __init__(self, expression, mainvars=None, eid=None):
RQLExpression.__init__(self, expression, mainvars or 'X', eid)
@property
def full_rql(self):
rql = self.minimal_rql
rqlst = getattr(self, 'rqlst', None) # may be not set yet
if rqlst is not None:
defined = rqlst.defined_vars
else:
defined = set(split_expression(self.expression))
if 'X' in defined:
rql += ', X eid %(x)s'
if 'U' in defined:
rql += ', U eid %(u)s'
return rql
def check(self, session, eid=None):
if 'X' in self.rqlst.defined_vars:
if eid is None:
return False
return self._check(session, x=eid)
return self._check(session)
class RRQLExpression(RQLExpression):
def __init__(self, expression, mainvars=None, eid=None):
if mainvars is None:
mainvars = guess_rrqlexpr_mainvars(expression)
RQLExpression.__init__(self, expression, mainvars, eid)
# graph of links between variable, used by rql rewriter
self.vargraph = {}
for relation in self.rqlst.get_nodes(nodes.Relation):
try:
rhsvarname = relation.children[1].children[0].variable.name
lhsvarname = relation.children[0].name
except AttributeError:
pass
else:
self.vargraph.setdefault(lhsvarname, []).append(rhsvarname)
self.vargraph.setdefault(rhsvarname, []).append(lhsvarname)
#self.vargraph[(lhsvarname, rhsvarname)] = relation.r_type
@property
def full_rql(self):
rql = self.minimal_rql
rqlst = getattr(self, 'rqlst', None) # may be not set yet
if rqlst is not None:
defined = rqlst.defined_vars
else:
defined = set(split_expression(self.expression))
if 'S' in defined:
rql += ', S eid %(s)s'
if 'O' in defined:
rql += ', O eid %(o)s'
if 'U' in defined:
rql += ', U eid %(u)s'
return rql
def check(self, session, fromeid=None, toeid=None):
kwargs = {}
if 'S' in self.rqlst.defined_vars:
if fromeid is None:
return False
kwargs['s'] = fromeid
if 'O' in self.rqlst.defined_vars:
if toeid is None:
return False
kwargs['o'] = toeid
return self._check(session, **kwargs)
# workflow extensions #########################################################
from yams.buildobjs import _add_relation as yams_add_relation
class workflowable_definition(ybo.metadefinition):
"""extends default EntityType's metaclass to add workflow relations
(i.e. in_state and wf_info_for).
This is the default metaclass for WorkflowableEntityType
"""
def __new__(mcs, name, bases, classdict):
abstract = classdict.pop('__abstract__', False)
cls = super(workflowable_definition, mcs).__new__(mcs, name, bases,
classdict)
if not abstract:
make_workflowable(cls)
return cls
def make_workflowable(cls, in_state_descr=None):
existing_rels = set(rdef.name for rdef in cls.__relations__)
# let relation types defined in cw.schemas.workflow carrying
# cardinality, constraints and other relation definition properties
if 'custom_workflow' not in existing_rels:
rdef = ybo.SubjectRelation('Workflow')
yams_add_relation(cls.__relations__, rdef, 'custom_workflow')
if 'in_state' not in existing_rels:
rdef = ybo.SubjectRelation('State', description=in_state_descr)
yams_add_relation(cls.__relations__, rdef, 'in_state')
if 'wf_info_for' not in existing_rels:
rdef = ybo.ObjectRelation('TrInfo')
yams_add_relation(cls.__relations__, rdef, 'wf_info_for')
class WorkflowableEntityType(ybo.EntityType):
__metaclass__ = workflowable_definition
__abstract__ = True
# schema loading ##############################################################
CONSTRAINTS['RQLConstraint'] = RQLConstraint
CONSTRAINTS['RQLUniqueConstraint'] = RQLUniqueConstraint
CONSTRAINTS['RQLVocabularyConstraint'] = RQLVocabularyConstraint
CONSTRAINTS.pop('MultipleStaticVocabularyConstraint', None) # don't want this in cw yams schema
PyFileReader.context.update(CONSTRAINTS)
class BootstrapSchemaLoader(SchemaLoader):
"""cubicweb specific schema loader, loading only schema necessary to read
the persistent schema
"""
schemacls = CubicWebSchema
def load(self, config, path=(), **kwargs):
"""return a Schema instance from the schema definition read
from <directory>
"""
return super(BootstrapSchemaLoader, self).load(
path, config.appid, register_base_types=False, **kwargs)
def _load_definition_files(self, cubes=None):
# bootstraping, ignore cubes
filepath = join(cubicweb.CW_SOFTWARE_ROOT, 'schemas', 'bootstrap.py')
self.info('loading %s', filepath)
self.handle_file(filepath)
def unhandled_file(self, filepath):
"""called when a file without handler associated has been found"""
self.warning('ignoring file %r', filepath)
class CubicWebSchemaLoader(BootstrapSchemaLoader):
"""cubicweb specific schema loader, automatically adding metadata to the
instance's schema
"""
def load(self, config, **kwargs):
"""return a Schema instance from the schema definition read
from <directory>
"""
self.info('loading %s schemas', ', '.join(config.cubes()))
self.extrapath = {}
for cubesdir in config.cubes_search_path():
if cubesdir != config.CUBES_DIR:
self.extrapath[cubesdir] = 'cubes'
if config.apphome:
path = tuple(reversed([config.apphome] + config.cubes_path()))
else:
path = tuple(reversed(config.cubes_path()))
try:
return super(CubicWebSchemaLoader, self).load(config, path=path, **kwargs)
finally:
# we've to cleanup modules imported from cubicweb.schemas as well
cleanup_sys_modules([join(cubicweb.CW_SOFTWARE_ROOT, 'schemas')])
def _load_definition_files(self, cubes):
for filepath in (join(cubicweb.CW_SOFTWARE_ROOT, 'schemas', 'bootstrap.py'),
join(cubicweb.CW_SOFTWARE_ROOT, 'schemas', 'base.py'),
join(cubicweb.CW_SOFTWARE_ROOT, 'schemas', 'workflow.py'),
join(cubicweb.CW_SOFTWARE_ROOT, 'schemas', 'Bookmark.py')):
self.info('loading %s', filepath)
self.handle_file(filepath)
for cube in cubes:
for filepath in self.get_schema_files(cube):
self.info('loading %s', filepath)
self.handle_file(filepath)
set_log_methods(CubicWebSchemaLoader, getLogger('cubicweb.schemaloader'))
set_log_methods(BootstrapSchemaLoader, getLogger('cubicweb.bootstrapschemaloader'))
set_log_methods(RQLExpression, getLogger('cubicweb.schema'))
# _() is just there to add messages to the catalog, don't care about actual
# translation
PERM_USE_TEMPLATE_FORMAT = _('use_template_format')
NEED_PERM_FORMATS = [_('text/cubicweb-page-template')]
@monkeypatch(FormatConstraint)
def vocabulary(self, entity=None, form=None):
cw = None
if form is None and entity is not None:
cw = entity._cw
elif form is not None:
cw = form._cw
if cw is not None and cw.user.has_permission(PERM_USE_TEMPLATE_FORMAT):
return self.regular_formats + tuple(NEED_PERM_FORMATS)
return self.regular_formats
# XXX monkey patch PyFileReader.import_erschema until bw_normalize_etype is
# necessary
orig_import_erschema = PyFileReader.import_erschema
def bw_import_erschema(self, ertype, schemamod=None, instantiate=True):
return orig_import_erschema(self, bw_normalize_etype(ertype), schemamod, instantiate)
PyFileReader.import_erschema = bw_import_erschema
# XXX itou for some Statement methods
from rql import stmts
orig_get_etype = stmts.ScopeNode.get_etype
def bw_get_etype(self, name):
return orig_get_etype(self, bw_normalize_etype(name))
stmts.ScopeNode.get_etype = bw_get_etype
orig_add_main_variable_delete = stmts.Delete.add_main_variable
def bw_add_main_variable_delete(self, etype, vref):
return orig_add_main_variable_delete(self, bw_normalize_etype(etype), vref)
stmts.Delete.add_main_variable = bw_add_main_variable_delete
orig_add_main_variable_insert = stmts.Insert.add_main_variable
def bw_add_main_variable_insert(self, etype, vref):
return orig_add_main_variable_insert(self, bw_normalize_etype(etype), vref)
stmts.Insert.add_main_variable = bw_add_main_variable_insert
orig_set_statement_type = stmts.Select.set_statement_type
def bw_set_statement_type(self, etype):
return orig_set_statement_type(self, bw_normalize_etype(etype))
stmts.Select.set_statement_type = bw_set_statement_type
# XXX deprecated
from yams.constraints import format_constraint
format_constraint = deprecated('[3.4] use RichString instead of format_constraint')(format_constraint)
from yams.buildobjs import RichString
PyFileReader.context['ERQLExpression'] = yobsolete(ERQLExpression)
PyFileReader.context['RRQLExpression'] = yobsolete(RRQLExpression)
PyFileReader.context['WorkflowableEntityType'] = WorkflowableEntityType
PyFileReader.context['format_constraint'] = format_constraint