__init__.py
author Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
Mon, 07 Sep 2009 20:23:40 +0200
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"""CubicWeb is a generic framework to quickly build applications which describes
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relations between entitites.
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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 cubicweb.__pkginfo__ import version as __version__
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import __builtin__
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# '_' is available in builtins to mark internationalized string but should
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# not be used to do the actual translation
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if not hasattr(__builtin__, '_'):
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    __builtin__._ = unicode
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CW_SOFTWARE_ROOT = __path__[0]
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import sys, os, logging
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from StringIO import StringIO
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from urllib import quote as urlquote, unquote as urlunquote
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from logilab.common.decorators import cached
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from logilab.common.logging_ext import set_log_methods
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if os.environ.get('APYCOT_ROOT'):
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    logging.basicConfig(level=logging.CRITICAL)
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else:
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    logging.basicConfig()
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set_log_methods(sys.modules[__name__], logging.getLogger('cubicweb'))
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# make all exceptions accessible from the package
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from cubicweb._exceptions import *
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# convert eid to the right type, raise ValueError if it's not a valid eid
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typed_eid = int
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#def log_thread(f, w, a):
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#    print f.f_code.co_filename, f.f_code.co_name
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#import threading
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#threading.settrace(log_thread)
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class Binary(StringIO):
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    """customize StringIO to make sure we don't use unicode"""
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    def __init__(self, buf=''):
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        assert isinstance(buf, (str, buffer)), \
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               "Binary objects must use raw strings, not %s" % buf.__class__
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        StringIO.__init__(self, buf)
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    def write(self, data):
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        assert isinstance(data, (str, buffer)), \
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               "Binary objects must use raw strings, not %s" % data.__class__
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        StringIO.write(self, data)
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class RequestSessionMixIn(object):
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    """mixin 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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    def property_value(self, key):
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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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0
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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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        from cubicweb.rset import ResultSet
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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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        from cubicweb.rset import ResultSet
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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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        from cubicweb.rset import ResultSet
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        return self.decorate_rset(ResultSet([], 'Any X WHERE X eid -1'))
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0
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    def entity_from_eid(self, eid, etype=None):
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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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    def set_entity_cache(self, entity):
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        pass
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    # url generation methods ##################################################
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   125
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    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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        assert len(args) == 1, 'only 0 or 1 non-named-argument expected'
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        method = args[0]
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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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   138
        if '_restpath' in kwargs:
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            assert method == 'view', method
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            path = kwargs.pop('_restpath')
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        else:
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            path = method
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   143
        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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   146
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    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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        for param, values in kwargs.items():
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            if not isinstance(values, (list, tuple)):
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                values = (values,)
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            for value in values:
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                args.append(u'%s=%s' % (param, self.url_quote(value)))
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        return '&'.join(args)
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   157
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   158
    def url_quote(self, value, safe=''):
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   159
        """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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   163
        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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   166
        return urlquote(str(value), safe=safe)
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   167
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   168
    def url_unquote(self, quoted):
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        """returns a unicode unquoted string
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0
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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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   173
        """
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   174
        if isinstance(quoted, unicode):
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            quoted = quoted.encode(self.encoding)
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        try:
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   177
            return unicode(urlunquote(quoted), self.encoding)
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   178
        except UnicodeDecodeError: # might occurs on manually typed URLs
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            return unicode(urlunquote(quoted), 'iso-8859-1')
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0
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   181
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    # session's user related methods #####################################
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   183
0
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   184
    @cached
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   185
    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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   188
        if self.is_internal_session:
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   189
            userinfo['login'] = "cubicweb"
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   190
            userinfo['name'] = "cubicweb"
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   191
            userinfo['email'] = ""
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   192
            return userinfo
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   193
        user = self.actual_session().user
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   194
        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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   195
        try:
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   196
            firstname, lastname, email = self.execute(rql, {'x': user.eid}, 'x')[0]
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   197
            if firstname is None and lastname is None:
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   198
                userinfo['name'] = ''
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   199
            else:
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   200
                userinfo['name'] = ("%s %s" % (firstname, lastname))
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   201
            userinfo['email'] = email
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   202
        except IndexError:
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diff changeset
   203
            userinfo['name'] = None
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   204
            userinfo['email'] = None
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   205
        userinfo['login'] = user.login
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diff changeset
   206
        return userinfo
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   207
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   208
    def is_internal_session(self):
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   209
        """overrided on the server-side"""
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   210
        return False
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   211
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   212
    # abstract methods to override according to the web front-end #############
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   213
0
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   214
    def base_url(self):
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diff changeset
   215
        """return the root url of the instance"""
0
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   216
        raise NotImplementedError
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diff changeset
   217
0
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   218
    def decorate_rset(self, rset):
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   219
        """add vreg/req (at least) attributes to the given result set """
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        raise NotImplementedError
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diff changeset
   221
0
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   222
    def describe(self, eid):
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   223
        """return a tuple (type, sourceuri, extid) for the entity with id <eid>"""
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   224
        raise NotImplementedError
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   225
0
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   226
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   227
# XXX 2.45 is allowing nicer entity type names, use this map for bw compat
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diff changeset
   228
ETYPE_NAME_MAP = {# 3.2 migration
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   229
                  'ECache': 'CWCache',
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   230
                  'EUser': 'CWUser',
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   231
                  'EGroup': 'CWGroup',
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   232
                  'EProperty': 'CWProperty',
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   233
                  'EFRDef': 'CWAttribute',
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   234
                  'ENFRDef': 'CWRelation',
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   235
                  'ERType': 'CWRType',
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   236
                  'EEType': 'CWEType',
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   237
                  'EConstraintType': 'CWConstraintType',
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   238
                  'EConstraint': 'CWConstraint',
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   239
                  'EPermission': 'CWPermission',
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   240
                   # 2.45 migration
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   241
                  'Eetype': 'CWEType',
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   242
                  'Ertype': 'CWRType',
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   243
                  'Efrdef': 'CWAttribute',
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   244
                  'Enfrdef': 'CWRelation',
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   245
                  'Econstraint': 'CWConstraint',
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   246
                  'Econstrainttype': 'CWConstraintType',
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   247
                  'Epermission': 'CWPermission',
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   248
                  'Egroup': 'CWGroup',
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   249
                  'Euser': 'CWUser',
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   250
                  'Eproperty': 'CWProperty',
0
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   251
                  'Emailaddress': 'EmailAddress',
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   252
                  'Rqlexpression': 'RQLExpression',
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   253
                  'Trinfo': 'TrInfo',
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diff changeset
   254
                  }
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# XXX cubic web cube migration map
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CW_MIGRATION_MAP = {'erudi': 'cubicweb',
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                    'eaddressbook': 'addressbook',
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                    'ebasket': 'basket',
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                    'eblog': 'blog',
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                    'ebook': 'book',
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                    'ecomment': 'comment',
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                    'ecompany': 'company',
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                    'econference':  'conference',
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                    'eemail': 'email',
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                    'eevent': 'event',
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                    'eexpense': 'expense',
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                    'efile': 'file',
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                    'einvoice': 'invoice',
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                    'elink': 'link',
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                    'emailinglist': 'mailinglist',
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                    'eperson': 'person',
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                    'eshopcart': 'shopcart',
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                    'eskillmat': 'skillmat',
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                    'etask': 'task',
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                    'eworkcase': 'workcase',
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                    'eworkorder': 'workorder',
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                    'ezone': 'zone',
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                    'i18ncontent': 'i18ncontent',
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                    'svnfile': 'vcsfile',
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0
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                    'eclassschemes': 'keyword',
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                    'eclassfolders': 'folder',
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                    'eclasstags': 'tag',
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                    'jpl': 'jpl',
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                    'jplintra': 'jplintra',
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                    'jplextra': 'jplextra',
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                    'jplorg': 'jplorg',
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                    'jplrecia': 'jplrecia',
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                    'crm': 'crm',
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                    'agueol': 'agueol',
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                    'docaster': 'docaster',
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                    'asteretud': 'asteretud',
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                    }
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def neg_role(role):
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    if role == 'subject':
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        return 'object'
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    return 'subject'
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def role(obj):
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    try:
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        return obj.role
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    except AttributeError:
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        return neg_role(obj.target)
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def target(obj):
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    try:
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        return obj.target
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    except AttributeError:
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        return neg_role(obj.role)
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def underline_title(title, car='-'):
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    return title+'\n'+(car*len(title))
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class CubicWebEventManager(object):
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    """simple event / callback manager.
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    Typical usage to register a callback::
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      >>> from cubicweb import CW_EVENT_MANAGER
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      >>> CW_EVENT_MANAGER.bind('after-registry-reload', mycallback)
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    Typical usage to emit an event::
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      >>> from cubicweb import CW_EVENT_MANAGER
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      >>> CW_EVENT_MANAGER.emit('after-registry-reload')
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    emit() accepts an additional context parameter that will be passed
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    to the callback if specified (and only in that case)
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    """
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    def __init__(self):
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        self.callbacks = {}
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    def bind(self, event, callback, *args, **kwargs):
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        self.callbacks.setdefault(event, []).append( (callback, args, kwargs) )
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    def emit(self, event, context=None):
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        for callback, args, kwargs in self.callbacks.get(event, ()):
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            if context is None:
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                callback(*args, **kwargs)
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            else:
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                callback(context, *args, **kwargs)
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CW_EVENT_MANAGER = CubicWebEventManager()
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def onevent(event):
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    """decorator to ease event / callback binding
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    >>> from cubicweb import onevent
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    >>> @onevent('before-registry-reload')
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    ... def mycallback():
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    ...     print 'hello'
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    ...
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    >>>
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    """
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    def _decorator(func):
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        CW_EVENT_MANAGER.bind(event, func)
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        return func
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    return _decorator