req.py
author Sylvain Thénault <sylvain.thenault@logilab.fr>
Thu, 13 Aug 2009 11:56:49 +0200
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child 2823 a4e3e9b1a9cd
permissions -rw-r--r--
no need for a classid class method
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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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    """
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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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    96
    def set_entity_cache(self, entity):
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    97
        pass
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    98
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    99
    def ensure_ro_rql(self, rql):
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   100
        """raise an exception if the given rql is not a select query"""
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   101
        first = rql.split(' ', 1)[0].lower()
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   102
        if first in ('insert', 'set', 'delete'):
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   103
            raise Unauthorized(self._('only select queries are authorized'))
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   104
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   105
    def get_cache(self, cachename):
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   106
        """
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   107
        NOTE: cachename should be dotted names as in :
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   108
        - cubicweb.mycache
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   109
        - cubes.blog.mycache
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   110
        - etc.
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   111
        """
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   112
        if cachename in CACHE_REGISTRY:
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   113
            cache = CACHE_REGISTRY[cachename]
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   114
        else:
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   115
            cache = CACHE_REGISTRY[cachename] = Cache()
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   116
        _now = datetime.now()
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   117
        if _now > cache.latest_cache_lookup + ONESECOND:
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   118
            ecache = self.execute(
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   119
                'Any C,T WHERE C is CWCache, C name %(name)s, C timestamp T',
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   120
                {'name':cachename}).get_entity(0,0)
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   121
            cache.latest_cache_lookup = _now
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   122
            if not ecache.valid(cache.cache_creation_date):
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   123
                cache.clear()
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   124
                cache.cache_creation_date = _now
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   125
        return cache
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   126
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   127
    # url generation methods ##################################################
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   128
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   129
    def build_url(self, *args, **kwargs):
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   130
        """return an absolute URL using params dictionary key/values as URL
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   131
        parameters. Values are automatically URL quoted, and the
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   132
        publishing method to use may be specified or will be guessed.
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   133
        """
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   134
        # use *args since we don't want first argument to be "anonymous" to
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   135
        # avoid potential clash with kwargs
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   136
        if args:
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   137
            assert len(args) == 1, 'only 0 or 1 non-named-argument expected'
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   138
            method = args[0]
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   139
        else:
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   140
            method = None
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   141
        # XXX I (adim) think that if method is passed explicitly, we should
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   142
        #     not try to process it and directly call req.build_url()
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   143
        if method is None:
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   144
            if self.from_controller() == 'view' and not '_restpath' in kwargs:
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   145
                method = self.relative_path(includeparams=False) or 'view'
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   146
            else:
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   147
                method = 'view'
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   148
        base_url = kwargs.pop('base_url', None)
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   149
        if base_url is None:
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   150
            base_url = self.base_url()
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   151
        if '_restpath' in kwargs:
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   152
            assert method == 'view', method
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   153
            path = kwargs.pop('_restpath')
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   154
        else:
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   155
            path = method
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   156
        if not kwargs:
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   157
            return u'%s%s' % (base_url, path)
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   158
        return u'%s%s?%s' % (base_url, path, self.build_url_params(**kwargs))
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   159
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   160
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   161
    def build_url_params(self, **kwargs):
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   162
        """return encoded params to incorporate them in an URL"""
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   163
        args = []
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   164
        for param, values in kwargs.items():
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   165
            if not isinstance(values, (list, tuple)):
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   166
                values = (values,)
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   167
            for value in values:
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   168
                args.append(u'%s=%s' % (param, self.url_quote(value)))
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   169
        return '&'.join(args)
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   170
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   171
    def url_quote(self, value, safe=''):
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   172
        """urllib.quote is not unicode safe, use this method to do the
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   173
        necessary encoding / decoding. Also it's designed to quote each
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   174
        part of a url path and so the '/' character will be encoded as well.
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   175
        """
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   176
        if isinstance(value, unicode):
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   177
            quoted = urlquote(value.encode(self.encoding), safe=safe)
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   178
            return unicode(quoted, self.encoding)
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   179
        return urlquote(str(value), safe=safe)
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   180
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   181
    def url_unquote(self, quoted):
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   182
        """returns a unicode unquoted string
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   183
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   184
        decoding is based on `self.encoding` which is the encoding
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   185
        used in `url_quote`
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   186
        """
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   187
        if isinstance(quoted, unicode):
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   188
            quoted = quoted.encode(self.encoding)
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   189
        try:
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   190
            return unicode(urlunquote(quoted), self.encoding)
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   191
        except UnicodeDecodeError: # might occurs on manually typed URLs
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   192
            return unicode(urlunquote(quoted), 'iso-8859-1')
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   193
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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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        rql = "Any F,S,A where U eid %(x)s, U firstname F, U surname S, U primary_email E, E address A"
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        try:
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            firstname, lastname, email = self.execute(rql, {'x': user.eid}, 'x')[0]
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            if firstname is None and lastname is None:
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                userinfo['name'] = ''
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   211
            else:
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                userinfo['name'] = ("%s %s" % (firstname, lastname))
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            userinfo['email'] = email
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        except IndexError:
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            userinfo['name'] = None
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            userinfo['email'] = None
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   217
        userinfo['login'] = user.login
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        return userinfo
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   219
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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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   223
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   224
    # formating methods #######################################################
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   225
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   226
    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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   230
        if date:
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   231
            if date_format is None:
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   232
                if time:
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   233
                    date_format = self.property_value('ui.datetime-format')
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   234
                else:
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   235
                    date_format = self.property_value('ui.date-format')
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   236
            return ustrftime(date, date_format)
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   237
        return u''
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   238
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   239
    def format_time(self, time):
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   240
        """return a string for a time according to instance's
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   241
        configuration
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   242
        """
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   243
        if time:
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   244
            return ustrftime(time, self.property_value('ui.time-format'))
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   245
        return u''
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   246
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   247
    def format_float(self, num):
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   248
        """return a string for floating point number according to instance's
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   249
        configuration
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   250
        """
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   251
        if num:
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   252
            return self.property_value('ui.float-format') % num
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   253
        return u''
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   254
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   255
    def parse_datetime(self, value, etype='Datetime'):
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   256
        """get a datetime or time from a string (according to etype)
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   257
        Datetime formatted as Date are accepted
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   258
        """
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diff changeset
   259
        assert etype in ('Datetime', 'Date', 'Time'), etype
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   260
        # XXX raise proper validation error
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diff changeset
   261
        if etype == 'Datetime':
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   262
            format = self.property_value('ui.datetime-format')
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   263
            try:
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   264
                return todatetime(strptime(value, format))
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diff changeset
   265
            except ValueError:
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   266
                pass
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   267
        elif etype == 'Time':
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   268
            format = self.property_value('ui.time-format')
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diff changeset
   269
            try:
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diff changeset
   270
                # (adim) I can't find a way to parse a Time with a custom format
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   271
                date = strptime(value, format) # this returns a DateTime
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   272
                return time(date.hour, date.minute, date.second)
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   273
            except ValueError:
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   274
                raise ValueError('can\'t parse %r (expected %s)' % (value, format))
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   275
        try:
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   276
            format = self.property_value('ui.date-format')
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   277
            dt = strptime(value, format)
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   278
            if etype == 'Datetime':
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   279
                return todatetime(dt)
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   280
            return todate(dt)
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   281
        except ValueError:
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   282
            raise ValueError('can\'t parse %r (expected %s)' % (value, format))
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   283
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   284
    # abstract methods to override according to the web front-end #############
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   285
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   286
    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