schemas/base.py
author Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
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backport most of CMHN css for facets
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"""core CubicWeb schema, but not necessary at bootstrap time
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:organization: Logilab
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:copyright: 2001-2008 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
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:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
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"""
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__docformat__ = "restructuredtext en"
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from cubicweb.schema import format_constraint
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class EUser(RestrictedEntityType):
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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('EGroup', 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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    in_state = SubjectRelation('State', cardinality='1*',
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                               # XXX automatize this
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                               constraints=[RQLConstraint('S is ET, O state_of ET')],
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                               description=_('account state'))
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    wf_info_for = ObjectRelation('TrInfo', cardinality='1*', composite='object')
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class EmailAddress(MetaEntityType):
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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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    canonical = Boolean(default=False,
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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 true on one of them which is the preferred form.'))
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    identical_to = SubjectRelation('EmailAddress')
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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 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 in_group(MetaRelationType):
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    """core relation indicating a user's groups"""
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    meta = False
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class owned_by(MetaRelationType):
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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 = 'EUser'
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class created_by(MetaRelationType):
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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 = 'EUser'
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class creation_date(MetaAttributeRelationType):
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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(MetaAttributeRelationType):
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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 State(MetaEntityType):
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    """used to associate simple states to an entity type and/or to define
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    workflows
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    """
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    name = String(required=True, indexed=True, internationalizable=True,
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                  maxsize=256)
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    description_format = String(meta=True, internationalizable=True, maxsize=50,
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                                default='text/rest', constraints=[format_constraint])
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    description = String(fulltextindexed=True,
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                         description=_('semantic description of this state'))
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    state_of = SubjectRelation('EEType', cardinality='+*',
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                    description=_('entity types which may use this state'),
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                    constraints=[RQLConstraint('O final FALSE')])
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    allowed_transition = SubjectRelation('Transition', cardinality='**',
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                                         constraints=[RQLConstraint('S state_of ET, O transition_of ET')],
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                                         description=_('allowed transitions from this state'))
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    initial_state = ObjectRelation('EEType', cardinality='?*',
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                                   # S initial_state O, O state_of S
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                                   constraints=[RQLConstraint('O state_of S')],
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                                   description=_('initial state for entities of this type'))
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class Transition(MetaEntityType):
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    """use to define a transition from one or multiple states to a destination
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    states in workflow's definitions.
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    """
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    name = String(required=True, indexed=True, internationalizable=True,
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                  maxsize=256)
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    description_format = String(meta=True, internationalizable=True, maxsize=50,
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                                default='text/rest', constraints=[format_constraint])
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    description = String(fulltextindexed=True,
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                         description=_('semantic description of this transition'))
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    condition = SubjectRelation('RQLExpression', cardinality='*?', composite='subject',
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                                description=_('a RQL expression which should return some results, '
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                                              'else the transition won\'t be available. '
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                                              'This query may use X and U variables '
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                                              'that will respectivly represents '
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                                              'the current entity and the current user'))
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    require_group = SubjectRelation('EGroup', cardinality='**',
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                                    description=_('group in which a user should be to be '
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                                                  'allowed to pass this transition'))
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    transition_of = SubjectRelation('EEType', cardinality='+*',
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                                    description=_('entity types which may use this transition'),
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                                    constraints=[RQLConstraint('O final FALSE')])
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    destination_state = SubjectRelation('State', cardinality='?*',
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                                        constraints=[RQLConstraint('S transition_of ET, O state_of ET')],
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                                        description=_('destination state for this transition'))
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class TrInfo(MetaEntityType):
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    from_state = SubjectRelation('State', cardinality='?*')
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    to_state = SubjectRelation('State', cardinality='1*')
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    comment_format = String(meta=True, internationalizable=True, maxsize=50,
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                            default='text/rest', constraints=[format_constraint])
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    comment = String(fulltextindexed=True)
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    # get actor and date time using owned_by and creation_date
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class from_state(MetaRelationType):
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    inlined = True
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class to_state(MetaRelationType):
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    inlined = True
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class wf_info_for(MetaRelationType):
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    """link a transition information to its object"""
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    permissions = {
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        'read':   ('managers', 'users', 'guests',),# RRQLExpression('U has_read_permission O')),
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        'add':    (), # handled automatically, no one should add one explicitly
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        'delete': ('managers',), # RRQLExpression('U has_delete_permission O')
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        }
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    inlined = True
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    composite = 'object'
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    fulltext_container = composite
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class state_of(MetaRelationType):
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    """link a state to one or more entity type"""
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class transition_of(MetaRelationType):
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    """link a transition to one or more entity type"""
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class initial_state(MetaRelationType):
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    """indicate which state should be used by default when an entity using
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    states is created
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    """
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    inlined = True
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class destination_state(MetaRelationType):
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    """destination state of a transition"""
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    inlined = True
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class allowed_transition(MetaRelationType):
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    """allowed transition from this state"""
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class in_state(UserRelationType):
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    """indicate the current state of an entity"""
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    meta = True
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    # not inlined intentionnaly since when using ldap sources, user'state
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    # has to be stored outside the EUser table
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    # add/delete perms given to managers/users, after what most of the job
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    # is done by workflow enforcment
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class EProperty(EntityType):
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    """used for cubicweb configuration. Once a property has been created you
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    can't change the key.
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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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        'update': ('managers', 'owners',),
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        'delete': ('managers', 'owners',),
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        }
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    meta = True
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    # key is a reserved word for mysql
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    pkey = String(required=True, internationalizable=True, maxsize=256,
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                  description=_('defines what\'s the property is applied for. '
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                                'You must select this first to be able to set '
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                                'value'))
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    value = String(internationalizable=True, maxsize=256)
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    for_user = SubjectRelation('EUser', cardinality='?*', composite='object',
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                               description=_('user for which this property is '
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                                             'applying. If this relation is not '
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                                             'set, the property is considered as'
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                                             ' a global property'))
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class for_user(MetaRelationType):
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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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class EPermission(MetaEntityType):
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    """entity type that may be used to construct some advanced security configuration
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    """
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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('EGroup', 
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                                    description=_('groups to which the permission is granted'))
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# explicitly add X require_permission EPermission 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(MetaRelationType):
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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 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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class ECache(MetaEntityType):
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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 AppRsetObject.get_cache() method.
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    """
6
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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',),
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        'delete': ('managers',),
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        }
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0
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    name = String(required=True, unique=True, indexed=True, 
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                  description=_('name of the cache'))
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    timestamp = Datetime(default='NOW')