req.py
author Sylvain Thénault <sylvain.thenault@logilab.fr>
Wed, 20 Jan 2010 14:41:04 +0100
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permissions -rw-r--r--
merge
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"""Base class for request/session
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:organization: Logilab
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:copyright: 2001-2009 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: Library General Public License version 2 - http://www.gnu.org/licenses
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"""
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__docformat__ = "restructuredtext en"
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from urllib import quote as urlquote, unquote as urlunquote
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from datetime import time, datetime, timedelta
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from logilab.common.decorators import cached
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from logilab.common.deprecation import deprecated
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from cubicweb import Unauthorized, RegistryException, typed_eid
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from cubicweb.rset import ResultSet
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from cubicweb.utils import ustrftime, strptime, todate, todatetime
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ONESECOND = timedelta(0, 1, 0)
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CACHE_REGISTRY = {}
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class Cache(dict):
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    def __init__(self):
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        super(Cache, self).__init__()
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        _now = datetime.now()
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        self.cache_creation_date = _now
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        self.latest_cache_lookup = _now
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class RequestSessionBase(object):
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    """base class containing stuff shared by server session and web request
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    request/session is the main resources accessor, mainly through it's vreg
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    attribute:
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    :vreg:
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      the instance's registry
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    :vreg.schema:
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      the instance's schema
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    :vreg.config:
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      the instance's configuration
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    """
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    def __init__(self, vreg):
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        self.vreg = vreg
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        try:
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            encoding = vreg.property_value('ui.encoding')
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        except: # no vreg or property not registered
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            encoding = 'utf-8'
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        self.encoding = encoding
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        # cache result of execution for (rql expr / eids),
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        # should be emptied on commit/rollback of the server session / web
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        # connection
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        self.local_perm_cache = {}
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        self._ = unicode
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    def property_value(self, key):
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        """return value of the property with the given key, giving priority to
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        user specific value if any, else using site value
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        """
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        if self.user:
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            return self.user.property_value(key)
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        return self.vreg.property_value(key)
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    def etype_rset(self, etype, size=1):
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        """return a fake result set for a particular entity type"""
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        rset = ResultSet([('A',)]*size, '%s X' % etype,
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                         description=[(etype,)]*size)
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        def get_entity(row, col=0, etype=etype, req=self, rset=rset):
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            return req.vreg.etype_class(etype)(req, rset, row, col)
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        rset.get_entity = get_entity
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        return self.decorate_rset(rset)
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    def eid_rset(self, eid, etype=None):
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        """return a result set for the given eid without doing actual query
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        (we have the eid, we can suppose it exists and user has access to the
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        entity)
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        """
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        eid = typed_eid(eid)
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        if etype is None:
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            etype = self.describe(eid)[0]
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        rset = ResultSet([(eid,)], 'Any X WHERE X eid %(x)s', {'x': eid},
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                         [(etype,)])
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        return self.decorate_rset(rset)
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    def empty_rset(self):
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        """return a result set for the given eid without doing actual query
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        (we have the eid, we can suppose it exists and user has access to the
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        entity)
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        """
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        return self.decorate_rset(ResultSet([], 'Any X WHERE X eid -1'))
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    def entity_from_eid(self, eid, etype=None):
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        """return an entity instance for the given eid. No query is done"""
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        try:
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            return self.entity_cache(eid)
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        except KeyError:
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            rset = self.eid_rset(eid, etype)
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            entity = rset.get_entity(0, 0)
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            self.set_entity_cache(entity)
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            return entity
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    def entity_cache(self, eid):
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        raise KeyError
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   105
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   106
    def set_entity_cache(self, entity):
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        pass
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   108
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    # XXX move to CWEntityManager or even better as factory method (unclear
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    # where yet...)
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   111
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    def create_entity(self, etype, _cw_unsafe=False, **kwargs):
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        """add a new entity of the given type
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   114
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        Example (in a shell session):
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        c = create_entity('Company', name=u'Logilab')
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        create_entity('Person', works_for=c, firstname=u'John', lastname=u'Doe')
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        """
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        if _cw_unsafe:
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            execute = self.unsafe_execute
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        else:
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            execute = self.execute
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        rql = 'INSERT %s X' % etype
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        relations = []
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        restrictions = set()
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        cachekey = []
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        pending_relations = []
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        for attr, value in kwargs.items():
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            if isinstance(value, (tuple, list, set, frozenset)):
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                if len(value) == 1:
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                    value = iter(value).next()
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                else:
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                    del kwargs[attr]
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                    pending_relations.append( (attr, value) )
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                    continue
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            if hasattr(value, 'eid'): # non final relation
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                rvar = attr.upper()
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                # XXX safer detection of object relation
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                if attr.startswith('reverse_'):
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   142
                    relations.append('%s %s X' % (rvar, attr[len('reverse_'):]))
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                else:
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                    relations.append('X %s %s' % (attr, rvar))
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                restriction = '%s eid %%(%s)s' % (rvar, attr)
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                if not restriction in restrictions:
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                    restrictions.add(restriction)
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                cachekey.append(attr)
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                kwargs[attr] = value.eid
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            else: # attribute
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                relations.append('X %s %%(%s)s' % (attr, attr))
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        if relations:
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            rql = '%s: %s' % (rql, ', '.join(relations))
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        if restrictions:
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            rql = '%s WHERE %s' % (rql, ', '.join(restrictions))
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        created = execute(rql, kwargs, cachekey).get_entity(0, 0)
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        for attr, values in pending_relations:
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            if attr.startswith('reverse_'):
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   159
                restr = 'Y %s X' % attr[len('reverse_'):]
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   160
            else:
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                restr = 'X %s Y' % attr
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            execute('SET %s WHERE X eid %%(x)s, Y eid IN (%s)' % (
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                restr, ','.join(str(r.eid) for r in values)),
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   164
                         {'x': created.eid}, 'x')
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        return created
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   166
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    def ensure_ro_rql(self, rql):
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        """raise an exception if the given rql is not a select query"""
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        first = rql.split(' ', 1)[0].lower()
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        if first in ('insert', 'set', 'delete'):
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            raise Unauthorized(self._('only select queries are authorized'))
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   172
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   173
    def get_cache(self, cachename):
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   174
        """
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        NOTE: cachename should be dotted names as in :
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   176
        - cubicweb.mycache
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        - cubes.blog.mycache
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        - etc.
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        """
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        if cachename in CACHE_REGISTRY:
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   181
            cache = CACHE_REGISTRY[cachename]
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   182
        else:
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   183
            cache = CACHE_REGISTRY[cachename] = Cache()
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   184
        _now = datetime.now()
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   185
        if _now > cache.latest_cache_lookup + ONESECOND:
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   186
            ecache = self.execute(
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   187
                'Any C,T WHERE C is CWCache, C name %(name)s, C timestamp T',
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   188
                {'name':cachename}).get_entity(0,0)
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   189
            cache.latest_cache_lookup = _now
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   190
            if not ecache.valid(cache.cache_creation_date):
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                cache.clear()
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                cache.cache_creation_date = _now
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   193
        return cache
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   194
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    # url generation methods ##################################################
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   197
    def build_url(self, *args, **kwargs):
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        """return an absolute URL using params dictionary key/values as URL
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        parameters. Values are automatically URL quoted, and the
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        publishing method to use may be specified or will be guessed.
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        """
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        # use *args since we don't want first argument to be "anonymous" to
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        # avoid potential clash with kwargs
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   204
        if args:
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            assert len(args) == 1, 'only 0 or 1 non-named-argument expected'
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            method = args[0]
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   207
        else:
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            method = None
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        # XXX I (adim) think that if method is passed explicitly, we should
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        #     not try to process it and directly call req.build_url()
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        if method is None:
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            if self.from_controller() == 'view' and not '_restpath' in kwargs:
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                method = self.relative_path(includeparams=False) or 'view'
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            else:
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                method = 'view'
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        base_url = kwargs.pop('base_url', None)
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        if base_url is None:
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            base_url = self.base_url()
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   219
        if '_restpath' in kwargs:
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            assert method == 'view', method
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            path = kwargs.pop('_restpath')
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   222
        else:
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            path = method
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   224
        if not kwargs:
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            return u'%s%s' % (base_url, path)
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        return u'%s%s?%s' % (base_url, path, self.build_url_params(**kwargs))
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   227
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   228
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   229
    def build_url_params(self, **kwargs):
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        """return encoded params to incorporate them in an URL"""
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        args = []
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   232
        for param, values in kwargs.items():
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   233
            if not isinstance(values, (list, tuple)):
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   234
                values = (values,)
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   235
            for value in values:
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   236
                args.append(u'%s=%s' % (param, self.url_quote(value)))
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   237
        return '&'.join(args)
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   238
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   239
    def url_quote(self, value, safe=''):
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   240
        """urllib.quote is not unicode safe, use this method to do the
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   241
        necessary encoding / decoding. Also it's designed to quote each
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   242
        part of a url path and so the '/' character will be encoded as well.
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   243
        """
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   244
        if isinstance(value, unicode):
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   245
            quoted = urlquote(value.encode(self.encoding), safe=safe)
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   246
            return unicode(quoted, self.encoding)
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   247
        return urlquote(str(value), safe=safe)
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   248
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   249
    def url_unquote(self, quoted):
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   250
        """returns a unicode unquoted string
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   251
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   252
        decoding is based on `self.encoding` which is the encoding
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   253
        used in `url_quote`
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   254
        """
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   255
        if isinstance(quoted, unicode):
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   256
            quoted = quoted.encode(self.encoding)
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   257
        try:
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   258
            return unicode(urlunquote(quoted), self.encoding)
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   259
        except UnicodeDecodeError: # might occurs on manually typed URLs
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   260
            return unicode(urlunquote(quoted), 'iso-8859-1')
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   261
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   262
    # bound user related methods ###############################################
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diff changeset
   263
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   264
    @cached
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   265
    def user_data(self):
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   266
        """returns a dictionnary with this user's information"""
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   267
        userinfo = {}
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   268
        if self.is_internal_session:
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   269
            userinfo['login'] = "cubicweb"
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   270
            userinfo['name'] = "cubicweb"
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   271
            userinfo['email'] = ""
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   272
            return userinfo
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diff changeset
   273
        user = self.actual_session().user
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diff changeset
   274
        userinfo['login'] = user.login
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diff changeset
   275
        userinfo['name'] = user.name()
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   276
        userinfo['email'] = user.get_email()
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   277
        return userinfo
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   278
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   279
    def is_internal_session(self):
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   280
        """overrided on the server-side"""
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   281
        return False
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   282
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   283
    # formating methods #######################################################
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   284
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   285
    def view(self, __vid, rset=None, __fallback_oid=None, __registry='views',
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6e9f7abee4ef fix initargs handling
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diff changeset
   286
             initargs=None, **kwargs):
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diff changeset
   287
        """Select object with the given id (`__oid`) then render it.  If the
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diff changeset
   288
        object isn't selectable, try to select fallback object if
6e9f7abee4ef fix initargs handling
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diff changeset
   289
        `__fallback_oid` is specified.
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diff changeset
   290
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diff changeset
   291
        If specified `initargs` is expected to be a dictionnary containing
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diff changeset
   292
        arguments that should be given to selection (hence to object's __init__
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diff changeset
   293
        as well), but not to render(). Other arbitrary keyword arguments will be
6e9f7abee4ef fix initargs handling
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diff changeset
   294
        given to selection *and* to render(), and so should be handled by
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diff changeset
   295
        object's call or cell_call method..
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diff changeset
   296
        """
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diff changeset
   297
        if initargs is None:
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diff changeset
   298
            initargs = kwargs
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diff changeset
   299
        else:
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diff changeset
   300
            initargs.update(kwargs)
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diff changeset
   301
        try:
4070
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diff changeset
   302
            view =  self.vreg[__registry].select(__vid, self, rset=rset, **initargs)
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af86ab65a282 3.6 updates
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diff changeset
   303
        except RegistryException:
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diff changeset
   304
            view =  self.vreg[__registry].select(__fallback_oid, self,
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diff changeset
   305
                                                 rset=rset, **initargs)
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diff changeset
   306
        return view.render(**kwargs)
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parents: 2808
diff changeset
   307
2792
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parents:
diff changeset
   308
    def format_date(self, date, date_format=None, time=False):
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diff changeset
   309
        """return a string for a date time according to instance's
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   310
        configuration
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   311
        """
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   312
        if date:
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   313
            if date_format is None:
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   314
                if time:
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diff changeset
   315
                    date_format = self.property_value('ui.datetime-format')
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   316
                else:
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   317
                    date_format = self.property_value('ui.date-format')
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   318
            return ustrftime(date, date_format)
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diff changeset
   319
        return u''
135580d15d42 rename and move cw.RequestSessionMixIn to cw.req.RequestSessionBase; move some appobjects methods where they actually belong to
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parents:
diff changeset
   320
135580d15d42 rename and move cw.RequestSessionMixIn to cw.req.RequestSessionBase; move some appobjects methods where they actually belong to
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parents:
diff changeset
   321
    def format_time(self, time):
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   322
        """return a string for a time according to instance's
135580d15d42 rename and move cw.RequestSessionMixIn to cw.req.RequestSessionBase; move some appobjects methods where they actually belong to
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diff changeset
   323
        configuration
135580d15d42 rename and move cw.RequestSessionMixIn to cw.req.RequestSessionBase; move some appobjects methods where they actually belong to
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diff changeset
   324
        """
135580d15d42 rename and move cw.RequestSessionMixIn to cw.req.RequestSessionBase; move some appobjects methods where they actually belong to
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parents:
diff changeset
   325
        if time:
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diff changeset
   326
            return ustrftime(time, self.property_value('ui.time-format'))
135580d15d42 rename and move cw.RequestSessionMixIn to cw.req.RequestSessionBase; move some appobjects methods where they actually belong to
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diff changeset
   327
        return u''
135580d15d42 rename and move cw.RequestSessionMixIn to cw.req.RequestSessionBase; move some appobjects methods where they actually belong to
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parents:
diff changeset
   328
135580d15d42 rename and move cw.RequestSessionMixIn to cw.req.RequestSessionBase; move some appobjects methods where they actually belong to
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diff changeset
   329
    def format_float(self, num):
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diff changeset
   330
        """return a string for floating point number according to instance's
135580d15d42 rename and move cw.RequestSessionMixIn to cw.req.RequestSessionBase; move some appobjects methods where they actually belong to
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parents:
diff changeset
   331
        configuration
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parents:
diff changeset
   332
        """
135580d15d42 rename and move cw.RequestSessionMixIn to cw.req.RequestSessionBase; move some appobjects methods where they actually belong to
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   333
        if num:
135580d15d42 rename and move cw.RequestSessionMixIn to cw.req.RequestSessionBase; move some appobjects methods where they actually belong to
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parents:
diff changeset
   334
            return self.property_value('ui.float-format') % num
135580d15d42 rename and move cw.RequestSessionMixIn to cw.req.RequestSessionBase; move some appobjects methods where they actually belong to
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parents:
diff changeset
   335
        return u''
135580d15d42 rename and move cw.RequestSessionMixIn to cw.req.RequestSessionBase; move some appobjects methods where they actually belong to
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parents:
diff changeset
   336
135580d15d42 rename and move cw.RequestSessionMixIn to cw.req.RequestSessionBase; move some appobjects methods where they actually belong to
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parents:
diff changeset
   337
    def parse_datetime(self, value, etype='Datetime'):
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diff changeset
   338
        """get a datetime or time from a string (according to etype)
135580d15d42 rename and move cw.RequestSessionMixIn to cw.req.RequestSessionBase; move some appobjects methods where they actually belong to
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parents:
diff changeset
   339
        Datetime formatted as Date are accepted
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parents:
diff changeset
   340
        """
135580d15d42 rename and move cw.RequestSessionMixIn to cw.req.RequestSessionBase; move some appobjects methods where they actually belong to
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parents:
diff changeset
   341
        assert etype in ('Datetime', 'Date', 'Time'), etype
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parents:
diff changeset
   342
        # XXX raise proper validation error
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parents:
diff changeset
   343
        if etype == 'Datetime':
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diff changeset
   344
            format = self.property_value('ui.datetime-format')
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parents:
diff changeset
   345
            try:
135580d15d42 rename and move cw.RequestSessionMixIn to cw.req.RequestSessionBase; move some appobjects methods where they actually belong to
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diff changeset
   346
                return todatetime(strptime(value, format))
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parents:
diff changeset
   347
            except ValueError:
135580d15d42 rename and move cw.RequestSessionMixIn to cw.req.RequestSessionBase; move some appobjects methods where they actually belong to
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diff changeset
   348
                pass
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parents:
diff changeset
   349
        elif etype == 'Time':
135580d15d42 rename and move cw.RequestSessionMixIn to cw.req.RequestSessionBase; move some appobjects methods where they actually belong to
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parents:
diff changeset
   350
            format = self.property_value('ui.time-format')
135580d15d42 rename and move cw.RequestSessionMixIn to cw.req.RequestSessionBase; move some appobjects methods where they actually belong to
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parents:
diff changeset
   351
            try:
135580d15d42 rename and move cw.RequestSessionMixIn to cw.req.RequestSessionBase; move some appobjects methods where they actually belong to
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   352
                # (adim) I can't find a way to parse a Time with a custom format
135580d15d42 rename and move cw.RequestSessionMixIn to cw.req.RequestSessionBase; move some appobjects methods where they actually belong to
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parents:
diff changeset
   353
                date = strptime(value, format) # this returns a DateTime
135580d15d42 rename and move cw.RequestSessionMixIn to cw.req.RequestSessionBase; move some appobjects methods where they actually belong to
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parents:
diff changeset
   354
                return time(date.hour, date.minute, date.second)
135580d15d42 rename and move cw.RequestSessionMixIn to cw.req.RequestSessionBase; move some appobjects methods where they actually belong to
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parents:
diff changeset
   355
            except ValueError:
4222
5667f493c505 return localized message on parse_datetime errors
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4070
diff changeset
   356
                raise ValueError(self._('can\'t parse %(value)r (expected %(format)s)')
5667f493c505 return localized message on parse_datetime errors
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parents: 4070
diff changeset
   357
                                 % {'value': value, 'format': format})
2792
135580d15d42 rename and move cw.RequestSessionMixIn to cw.req.RequestSessionBase; move some appobjects methods where they actually belong to
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parents:
diff changeset
   358
        try:
135580d15d42 rename and move cw.RequestSessionMixIn to cw.req.RequestSessionBase; move some appobjects methods where they actually belong to
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   359
            format = self.property_value('ui.date-format')
135580d15d42 rename and move cw.RequestSessionMixIn to cw.req.RequestSessionBase; move some appobjects methods where they actually belong to
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   360
            dt = strptime(value, format)
135580d15d42 rename and move cw.RequestSessionMixIn to cw.req.RequestSessionBase; move some appobjects methods where they actually belong to
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   361
            if etype == 'Datetime':
135580d15d42 rename and move cw.RequestSessionMixIn to cw.req.RequestSessionBase; move some appobjects methods where they actually belong to
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   362
                return todatetime(dt)
135580d15d42 rename and move cw.RequestSessionMixIn to cw.req.RequestSessionBase; move some appobjects methods where they actually belong to
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parents:
diff changeset
   363
            return todate(dt)
135580d15d42 rename and move cw.RequestSessionMixIn to cw.req.RequestSessionBase; move some appobjects methods where they actually belong to
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   364
        except ValueError:
4222
5667f493c505 return localized message on parse_datetime errors
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4070
diff changeset
   365
            raise ValueError(self._('can\'t parse %(value)r (expected %(format)s)')
5667f493c505 return localized message on parse_datetime errors
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 4070
diff changeset
   366
                             % {'value': value, 'format': format})
2792
135580d15d42 rename and move cw.RequestSessionMixIn to cw.req.RequestSessionBase; move some appobjects methods where they actually belong to
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   367
135580d15d42 rename and move cw.RequestSessionMixIn to cw.req.RequestSessionBase; move some appobjects methods where they actually belong to
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   368
    # abstract methods to override according to the web front-end #############
135580d15d42 rename and move cw.RequestSessionMixIn to cw.req.RequestSessionBase; move some appobjects methods where they actually belong to
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parents:
diff changeset
   369
135580d15d42 rename and move cw.RequestSessionMixIn to cw.req.RequestSessionBase; move some appobjects methods where they actually belong to
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parents:
diff changeset
   370
    def base_url(self):
135580d15d42 rename and move cw.RequestSessionMixIn to cw.req.RequestSessionBase; move some appobjects methods where they actually belong to
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parents:
diff changeset
   371
        """return the root url of the instance"""
135580d15d42 rename and move cw.RequestSessionMixIn to cw.req.RequestSessionBase; move some appobjects methods where they actually belong to
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parents:
diff changeset
   372
        raise NotImplementedError
135580d15d42 rename and move cw.RequestSessionMixIn to cw.req.RequestSessionBase; move some appobjects methods where they actually belong to
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   373
135580d15d42 rename and move cw.RequestSessionMixIn to cw.req.RequestSessionBase; move some appobjects methods where they actually belong to
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parents:
diff changeset
   374
    def decorate_rset(self, rset):
135580d15d42 rename and move cw.RequestSessionMixIn to cw.req.RequestSessionBase; move some appobjects methods where they actually belong to
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parents:
diff changeset
   375
        """add vreg/req (at least) attributes to the given result set """
135580d15d42 rename and move cw.RequestSessionMixIn to cw.req.RequestSessionBase; move some appobjects methods where they actually belong to
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parents:
diff changeset
   376
        raise NotImplementedError
135580d15d42 rename and move cw.RequestSessionMixIn to cw.req.RequestSessionBase; move some appobjects methods where they actually belong to
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   377
135580d15d42 rename and move cw.RequestSessionMixIn to cw.req.RequestSessionBase; move some appobjects methods where they actually belong to
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parents:
diff changeset
   378
    def describe(self, eid):
135580d15d42 rename and move cw.RequestSessionMixIn to cw.req.RequestSessionBase; move some appobjects methods where they actually belong to
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parents:
diff changeset
   379
        """return a tuple (type, sourceuri, extid) for the entity with id <eid>"""
135580d15d42 rename and move cw.RequestSessionMixIn to cw.req.RequestSessionBase; move some appobjects methods where they actually belong to
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   380
        raise NotImplementedError
3659
993997b4b41d 3.6 update
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3655
diff changeset
   381
993997b4b41d 3.6 update
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3655
diff changeset
   382
    @property
993997b4b41d 3.6 update
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3655
diff changeset
   383
    @deprecated('[3.6] use _cw.vreg.config')
993997b4b41d 3.6 update
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3655
diff changeset
   384
    def config(self):
993997b4b41d 3.6 update
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3655
diff changeset
   385
        return self.vreg.config
993997b4b41d 3.6 update
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3655
diff changeset
   386
993997b4b41d 3.6 update
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3655
diff changeset
   387
    @property
993997b4b41d 3.6 update
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parents: 3655
diff changeset
   388
    @deprecated('[3.6] use _cw.vreg.schema')
993997b4b41d 3.6 update
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3655
diff changeset
   389
    def schema(self):
993997b4b41d 3.6 update
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents: 3655
diff changeset
   390
        return self.vreg.schema