req.py
author Sylvain Thénault <sylvain.thenault@logilab.fr>
Wed, 23 Sep 2009 08:17:52 +0200
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parent 3163 edfe43ceaa35
child 3629 559cad62c786
permissions -rw-r--r--
backport stable
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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 cubicweb import Unauthorized, 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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    99
            self.set_entity_cache(entity)
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   100
            return entity
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   101
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   102
    def entity_cache(self, eid):
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   103
        raise KeyError
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   104
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   105
    def set_entity_cache(self, entity):
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   106
        pass
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   107
2968
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   108
    # XXX move to CWEntityManager or even better as factory method (unclear
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   109
    # where yet...)
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   110
    def create_entity(self, etype, *args, **kwargs):
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   111
        """add a new entity of the given type"""
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   112
        rql = 'INSERT %s X' % etype
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   113
        relations = []
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   114
        restrictions = []
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   115
        cachekey = []
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   116
        for rtype, rvar in args:
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   117
            relations.append('X %s %s' % (rtype, rvar))
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   118
            restrictions.append('%s eid %%(%s)s' % (rvar, rvar))
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   119
            cachekey.append(rvar)
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   120
        for attr in kwargs:
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   121
            if attr in cachekey:
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   122
                continue
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   123
            relations.append('X %s %%(%s)s' % (attr, attr))
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   124
        if relations:
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   125
            rql = '%s: %s' % (rql, ', '.join(relations))
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   126
        if restrictions:
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   127
            rql = '%s WHERE %s' % (rql, ', '.join(restrictions))
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   128
        return self.execute(rql, kwargs, cachekey).get_entity(0, 0)
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   129
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   130
    def ensure_ro_rql(self, rql):
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   131
        """raise an exception if the given rql is not a select query"""
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   132
        first = rql.split(' ', 1)[0].lower()
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   133
        if first in ('insert', 'set', 'delete'):
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   134
            raise Unauthorized(self._('only select queries are authorized'))
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   135
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   136
    def get_cache(self, cachename):
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   137
        """
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   138
        NOTE: cachename should be dotted names as in :
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   139
        - cubicweb.mycache
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   140
        - cubes.blog.mycache
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   141
        - etc.
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   142
        """
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   143
        if cachename in CACHE_REGISTRY:
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   144
            cache = CACHE_REGISTRY[cachename]
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   145
        else:
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   146
            cache = CACHE_REGISTRY[cachename] = Cache()
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   147
        _now = datetime.now()
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   148
        if _now > cache.latest_cache_lookup + ONESECOND:
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   149
            ecache = self.execute(
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   150
                'Any C,T WHERE C is CWCache, C name %(name)s, C timestamp T',
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   151
                {'name':cachename}).get_entity(0,0)
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   152
            cache.latest_cache_lookup = _now
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   153
            if not ecache.valid(cache.cache_creation_date):
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   154
                cache.clear()
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   155
                cache.cache_creation_date = _now
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   156
        return cache
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   157
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   158
    # url generation methods ##################################################
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   159
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   160
    def build_url(self, *args, **kwargs):
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   161
        """return an absolute URL using params dictionary key/values as URL
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   162
        parameters. Values are automatically URL quoted, and the
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   163
        publishing method to use may be specified or will be guessed.
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   164
        """
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   165
        # use *args since we don't want first argument to be "anonymous" to
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   166
        # avoid potential clash with kwargs
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   167
        if args:
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   168
            assert len(args) == 1, 'only 0 or 1 non-named-argument expected'
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   169
            method = args[0]
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   170
        else:
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   171
            method = None
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   172
        # XXX I (adim) think that if method is passed explicitly, we should
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   173
        #     not try to process it and directly call req.build_url()
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   174
        if method is None:
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   175
            if self.from_controller() == 'view' and not '_restpath' in kwargs:
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   176
                method = self.relative_path(includeparams=False) or 'view'
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   177
            else:
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   178
                method = 'view'
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   179
        base_url = kwargs.pop('base_url', None)
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   180
        if base_url is None:
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   181
            base_url = self.base_url()
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   182
        if '_restpath' in kwargs:
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   183
            assert method == 'view', method
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   184
            path = kwargs.pop('_restpath')
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   185
        else:
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   186
            path = method
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   187
        if not kwargs:
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   188
            return u'%s%s' % (base_url, path)
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   189
        return u'%s%s?%s' % (base_url, path, self.build_url_params(**kwargs))
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   190
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   191
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   192
    def build_url_params(self, **kwargs):
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   193
        """return encoded params to incorporate them in an URL"""
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   194
        args = []
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   195
        for param, values in kwargs.items():
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   196
            if not isinstance(values, (list, tuple)):
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   197
                values = (values,)
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   198
            for value in values:
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   199
                args.append(u'%s=%s' % (param, self.url_quote(value)))
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        return '&'.join(args)
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    def url_quote(self, value, safe=''):
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        """urllib.quote is not unicode safe, use this method to do the
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        necessary encoding / decoding. Also it's designed to quote each
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        part of a url path and so the '/' character will be encoded as well.
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        """
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        if isinstance(value, unicode):
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            quoted = urlquote(value.encode(self.encoding), safe=safe)
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            return unicode(quoted, self.encoding)
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        return urlquote(str(value), safe=safe)
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    def url_unquote(self, quoted):
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        """returns a unicode unquoted string
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        decoding is based on `self.encoding` which is the encoding
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        used in `url_quote`
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        """
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        if isinstance(quoted, unicode):
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            quoted = quoted.encode(self.encoding)
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        try:
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            return unicode(urlunquote(quoted), self.encoding)
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        except UnicodeDecodeError: # might occurs on manually typed URLs
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            return unicode(urlunquote(quoted), 'iso-8859-1')
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   224
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    # bound user related methods ###############################################
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    @cached
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    def user_data(self):
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        """returns a dictionnary with this user's information"""
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        userinfo = {}
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        if self.is_internal_session:
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            userinfo['login'] = "cubicweb"
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            userinfo['name'] = "cubicweb"
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            userinfo['email'] = ""
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            return userinfo
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        user = self.actual_session().user
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        userinfo['login'] = user.login
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        userinfo['name'] = user.name()
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        userinfo['email'] = user.get_email()
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        return userinfo
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   241
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    def is_internal_session(self):
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        """overrided on the server-side"""
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        return False
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   245
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    # formating methods #######################################################
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    def view(self, __vid, rset=None, __fallback_oid=None, __registry='views',
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             **kwargs):
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        """shortcut to self.vreg.view method avoiding to pass the request"""
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        return self.vreg[__registry].render(__vid, self, __fallback_oid,
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                                            rset=rset, **kwargs)
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   253
2792
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    def format_date(self, date, date_format=None, time=False):
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        """return a string for a date time according to instance's
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        configuration
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        """
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   258
        if date:
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            if date_format is None:
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                if time:
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   261
                    date_format = self.property_value('ui.datetime-format')
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   262
                else:
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   263
                    date_format = self.property_value('ui.date-format')
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            return ustrftime(date, date_format)
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   265
        return u''
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   266
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   267
    def format_time(self, time):
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        """return a string for a time according to instance's
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   269
        configuration
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        """
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   271
        if time:
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            return ustrftime(time, self.property_value('ui.time-format'))
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        return u''
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   274
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   275
    def format_float(self, num):
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        """return a string for floating point number according to instance's
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        configuration
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        """
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   279
        if num:
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   280
            return self.property_value('ui.float-format') % num
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   281
        return u''
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   282
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   283
    def parse_datetime(self, value, etype='Datetime'):
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        """get a datetime or time from a string (according to etype)
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        Datetime formatted as Date are accepted
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        """
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   287
        assert etype in ('Datetime', 'Date', 'Time'), etype
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        # XXX raise proper validation error
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   289
        if etype == 'Datetime':
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   290
            format = self.property_value('ui.datetime-format')
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            try:
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   292
                return todatetime(strptime(value, format))
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   293
            except ValueError:
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                pass
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   295
        elif etype == 'Time':
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            format = self.property_value('ui.time-format')
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            try:
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                # (adim) I can't find a way to parse a Time with a custom format
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                date = strptime(value, format) # this returns a DateTime
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                return time(date.hour, date.minute, date.second)
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            except ValueError:
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                raise ValueError('can\'t parse %r (expected %s)' % (value, format))
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        try:
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            format = self.property_value('ui.date-format')
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            dt = strptime(value, format)
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            if etype == 'Datetime':
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                return todatetime(dt)
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            return todate(dt)
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        except ValueError:
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            raise ValueError('can\'t parse %r (expected %s)' % (value, format))
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    # abstract methods to override according to the web front-end #############
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    def base_url(self):
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        """return the root url of the instance"""
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        raise NotImplementedError
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    def decorate_rset(self, rset):
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        """add vreg/req (at least) attributes to the given result set """
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        raise NotImplementedError
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    def describe(self, eid):
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        """return a tuple (type, sourceuri, extid) for the entity with id <eid>"""
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        raise NotImplementedError