schemas/base.py
author Sylvain Thénault <sylvain.thenault@logilab.fr>
Mon, 18 Jan 2010 19:21:30 +0100
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"""core CubicWeb schema, but not necessary at bootstrap time
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:organization: Logilab
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:copyright: 2001-2010 LOGILAB S.A. (Paris, FRANCE), license is LGPL v2.
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:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
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:license: GNU Lesser General Public License, v2.1 - http://www.gnu.org/licenses
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"""
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__docformat__ = "restructuredtext en"
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_ = unicode
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from yams.buildobjs import (EntityType, RelationType, SubjectRelation,
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                            String, Boolean, Datetime, Password)
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from cubicweb.schema import (RQLConstraint, WorkflowableEntityType,
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                             ERQLExpression, RRQLExpression)
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from cubicweb.schemas import META_ETYPE_PERMS, META_RTYPE_PERMS
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class CWUser(WorkflowableEntityType):
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    """define a CubicWeb user"""
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    __permissions__ = {
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        'read':   ('managers', 'users', ERQLExpression('X identity U')),
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        'add':    ('managers',),
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        'delete': ('managers',),
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        'update': ('managers', ERQLExpression('X identity U, NOT U in_group G, G name "guests"'),),
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        }
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    login     = String(required=True, unique=True, maxsize=64,
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                       description=_('unique identifier used to connect to the application'))
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    upassword = Password(required=True) # password is a reserved word for mysql
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    firstname = String(maxsize=64)
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    surname   = String(maxsize=64)
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    last_login_time  = Datetime(description=_('last connection date'))
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    # allowing an email to be the primary email of multiple entities is necessary for
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    # test at least :-/
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    primary_email = SubjectRelation('EmailAddress', cardinality='??',
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                                    description=_('email address to use for notification'))
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    use_email     = SubjectRelation('EmailAddress', cardinality='*?', composite='subject')
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    in_group = SubjectRelation('CWGroup', cardinality='+*',
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                               constraints=[RQLConstraint('NOT O name "owners"')],
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                               description=_('groups grant permissions to the user'))
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class EmailAddress(EntityType):
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    """an electronic mail address associated to a short alias"""
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    __permissions__ = {
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        'read':   ('managers', 'users', 'guests',), # XXX if P use_email X, U has_read_permission P
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        'add':    ('managers', 'users',),
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        'delete': ('managers', 'owners', ERQLExpression('P use_email X, U has_update_permission P')),
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        'update': ('managers', 'owners', ERQLExpression('P use_email X, U has_update_permission P')),
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        }
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    alias   = String(fulltextindexed=True, maxsize=56)
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    address = String(required=True, fulltextindexed=True,
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                     indexed=True, unique=True, maxsize=128)
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    prefered_form = SubjectRelation('EmailAddress', cardinality='?*',
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                                    description=_('when multiple addresses are equivalent \
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(such as python-projects@logilab.org and python-projects@lists.logilab.org), set this \
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to indicate which is the preferred form.'))
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class use_email(RelationType):
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    """ """
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    __permissions__ = {
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        'read':   ('managers', 'users', 'guests',),
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        'add':    ('managers', RRQLExpression('U has_update_permission S'),),
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        'delete': ('managers', RRQLExpression('U has_update_permission S'),),
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        }
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    fulltext_container = 'subject'
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class primary_email(RelationType):
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    """the prefered email"""
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    __permissions__ = use_email.__permissions__
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class prefered_form(RelationType):
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    __permissions__ = {
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        'read':   ('managers', 'users', 'guests',),
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        # XXX should have update __permissions__ on both subject and object,
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        #     though by doing this we will probably have no way to add
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        #     this relation in the web ui. The easiest way to acheive this
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        #     is probably to be able to have "U has_update_permission O" as
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        #     RQLConstraint of the relation definition, though this is not yet
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        #     possible
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        'add':    ('managers', RRQLExpression('U has_update_permission S'),),
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        'delete': ('managers', RRQLExpression('U has_update_permission S'),),
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        }
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class in_group(RelationType):
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    """core relation indicating a user's groups"""
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    __permissions__ = META_RTYPE_PERMS
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class owned_by(RelationType):
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    """core relation indicating owners of an entity. This relation
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    implicitly put the owner into the owners group for the entity
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    """
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    __permissions__ = {
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        'read':   ('managers', 'users', 'guests'),
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        'add':    ('managers', RRQLExpression('S owned_by U'),),
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        'delete': ('managers', RRQLExpression('S owned_by U'),),
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        }
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    # 0..n cardinality for entities created by internal session (no attached user)
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    # and to support later deletion of a user which has created some entities
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    cardinality = '**'
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    subject = '*'
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    object = 'CWUser'
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class created_by(RelationType):
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    """core relation indicating the original creator of an entity"""
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    __permissions__ = {
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        'read':   ('managers', 'users', 'guests'),
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        'add':    ('managers',),
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        'delete': ('managers',),
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        }
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    # 0..1 cardinality for entities created by internal session (no attached user)
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    # and to support later deletion of a user which has created some entities
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    cardinality = '?*'
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    subject = '*'
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    object = 'CWUser'
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class creation_date(RelationType):
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    """creation time of an entity"""
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    cardinality = '11'
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    subject = '*'
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    object = 'Datetime'
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class modification_date(RelationType):
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    """latest modification time of an entity"""
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    cardinality = '11'
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    subject = '*'
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    object = 'Datetime'
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class cwuri(RelationType):
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    """internal entity uri"""
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    cardinality = '11'
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    subject = '*'
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    object = 'String'
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# XXX find a better relation name
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class for_user(RelationType):
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    """link a property to the user which want this property customization. Unless
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    you're a site manager, this relation will be handled automatically.
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    """
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    __permissions__ = {
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        'read':   ('managers', 'users', 'guests'),
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        'add':    ('managers',),
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        'delete': ('managers',),
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        }
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    inlined = True
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    subject = 'CWProperty'
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    object = 'CWUser'
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    composite = 'object'
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    cardinality = '?*'
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class CWPermission(EntityType):
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    """entity type that may be used to construct some advanced security configuration
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    """
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    __permissions__ = META_ETYPE_PERMS
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    name = String(required=True, indexed=True, internationalizable=True, maxsize=100,
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                  description=_('name or identifier of the permission'))
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    label = String(required=True, internationalizable=True, maxsize=100,
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                   description=_('distinct label to distinguate between other permission entity of the same name'))
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    require_group = SubjectRelation('CWGroup',
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                                    description=_('groups to which the permission is granted'))
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# explicitly add X require_permission CWPermission for each entity that should have
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# configurable security
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class require_permission(RelationType):
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    """link a permission to the entity. This permission should be used in the
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    security definition of the entity's type to be useful.
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    """
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    __permissions__ = {
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        'read':   ('managers', 'users', 'guests'),
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        'add':    ('managers',),
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        'delete': ('managers',),
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        }
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class require_group(RelationType):
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    """used to grant a permission to a group"""
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    __permissions__ = {
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        'read':   ('managers', 'users', 'guests'),
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        'add':    ('managers',),
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        'delete': ('managers',),
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        }
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class ExternalUri(EntityType):
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    """a URI representing an object in external data store"""
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    uri = String(required=True, unique=True, maxsize=256,
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                 description=_('the URI of the object'))
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class same_as(RelationType):
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    """generic relation to specify that an external entity represent the same
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    object as a local one:
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       http://www.w3.org/TR/owl-ref/#sameAs-def
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    NOTE: You'll have to explicitly declare which entity types can have a
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    same_as relation
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    """
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    __permissions__ = {
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        'read':   ('managers', 'users', 'guests',),
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        'add':    ('managers', 'users'),
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        'delete': ('managers', 'owners'),
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        }
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    cardinality = '*1'
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    symetric = True
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    # NOTE: the 'object = ExternalUri' declaration will still be mandatory
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    #       in the cube's schema.
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    object = 'ExternalUri'
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class CWCache(EntityType):
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    """a simple cache entity characterized by a name and
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    a validity date.
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    The target application is responsible for updating timestamp
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    when necessary to invalidate the cache (typically in hooks).
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    Also, checkout the AppObject.get_cache() method.
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    """
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    __permissions__ = {
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        'read':   ('managers', 'users', 'guests'),
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        'add':    ('managers',),
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        'update': ('managers', 'users',), # XXX
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        'delete': ('managers',),
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        }
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    name = String(required=True, unique=True, indexed=True,  maxsize=128,
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                  description=_('name of the cache'))
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    timestamp = Datetime(default='NOW')
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# "abtract" relation types, not used in cubicweb itself
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class identical_to(RelationType):
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    """identical to"""
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    symetric = True
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    __permissions__ = {
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        'read':   ('managers', 'users', 'guests',),
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        # XXX should have update __permissions__ on both subject and object,
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        #     though by doing this we will probably have no way to add
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        #     this relation in the web ui. The easiest way to acheive this
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        #     is probably to be able to have "U has_update_permission O" as
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        #     RQLConstraint of the relation definition, though this is not yet
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        #     possible
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        'add':    ('managers', RRQLExpression('U has_update_permission S'),),
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        'delete': ('managers', RRQLExpression('U has_update_permission S'),),
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        }
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class see_also(RelationType):
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    """generic relation to link one entity to another"""
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    symetric = True
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    __permissions__ = {
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        'read':   ('managers', 'users', 'guests',),
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        'add':    ('managers', RRQLExpression('U has_update_permission S'),),
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        'delete': ('managers', RRQLExpression('U has_update_permission S'),),
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        }