__init__.py
author Julien Cristau <julien.cristau@logilab.fr>
Thu, 10 Oct 2013 10:02:29 +0200
branchstable
changeset 9306 8ab0e601d418
parent 8748 f5027f8d2478
child 9046 6fb3f0106301
child 9299 c5eed908117d
permissions -rw-r--r--
[web] don't rename resources in gen-static-datadir We should use the result from WebConfiguration.locate_resource to know which file to copy, not what name to copy it to. The destination file should be the name of the resource, as the client will request it. This matters in the case of cubicweb.css which locate_resource might rewrite to cubicweb.old.css. Closes #3206129
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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# copyright 2003-2012 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
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# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
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#
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# This file is part of CubicWeb.
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#
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# CubicWeb is free software: you can redistribute it and/or modify it under the
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# terms of the GNU Lesser General Public License as published by the Free
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# Software Foundation, either version 2.1 of the License, or (at your option)
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# any later version.
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#
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# CubicWeb is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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# FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
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# details.
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#
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# You should have received a copy of the GNU Lesser General Public License along
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# with CubicWeb.  If not, see <http://www.gnu.org/licenses/>.
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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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"""
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__docformat__ = "restructuredtext en"
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# ignore the pygments UserWarnings
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import warnings
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warnings.filterwarnings('ignore', category=UserWarning,
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                        message='.*was already imported',
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                        module='.*pygments')
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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 logilab.common.deprecation import deprecated
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from logilab.common.logging_ext import set_log_methods
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from yams.constraints import BASE_CONVERTERS
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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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from cubicweb.__pkginfo__ import version as __version__
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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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from logilab.common.registry import ObjectNotFound, NoSelectableObject, RegistryNotFound
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# convert eid to the right type, raise ValueError if it's not a valid eid
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@deprecated('[3.17] typed_eid() was removed. replace it with int() when needed.')
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def typed_eid(eid):
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    return int(eid)
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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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    def to_file(self, fobj):
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        """write a binary to disk
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        the writing is performed in a safe way for files stored on
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        Windows SMB shares
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        """
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        pos = self.tell()
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        self.seek(0)
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        if sys.platform == 'win32':
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            while True:
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                # the 16kB chunksize comes from the shutil module
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                # in stdlib
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                chunk = self.read(16*1024)
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                if not chunk:
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                    break
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                fobj.write(chunk)
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        else:
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            fobj.write(self.read())
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        self.seek(pos)
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    @staticmethod
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    def from_file(filename):
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        """read a file and returns its contents in a Binary
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        the reading is performed in a safe way for files stored on
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        Windows SMB shares
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        """
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        binary = Binary()
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        with open(filename, 'rb') as fobj:
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            if sys.platform == 'win32':
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                while True:
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                    # the 16kB chunksize comes from the shutil module
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                    # in stdlib
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                    chunk = fobj.read(16*1024)
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                    if not chunk:
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                        break
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                    binary.write(chunk)
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            else:
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                binary.write(fobj.read())
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        binary.seek(0)
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        return binary
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def str_or_binary(value):
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    if isinstance(value, Binary):
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        return value
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    return str(value)
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BASE_CONVERTERS['Password'] = str_or_binary
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# use this dictionary to rename entity types while keeping bw compat
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ETYPE_NAME_MAP = {}
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# XXX cubic web cube migration map. See if it's worth keeping this mecanism
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#     to help in cube renaming
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CW_MIGRATION_MAP = {}
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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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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, *args, **kwargs):
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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, *args, **kwargs)
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        return func
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    return _decorator
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from yams.schema import role_name as rname
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def validation_error(entity, errors, substitutions=None, i18nvalues=None):
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    """easy way to retrieve a :class:`cubicweb.ValidationError` for an entity or eid.
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    You may also have 2-tuple as error keys, :func:`yams.role_name` will be
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    called automatically for them.
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    Messages in errors **should not be translated yet**, though marked for
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    internationalization. You may give an additional substition dictionary that
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    will be used for interpolation after the translation.
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    """
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    if substitutions is None:
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        # set empty dict else translation won't be done for backward
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        # compatibility reason (see ValidationError.translate method)
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        substitutions = {}
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    for key in list(errors):
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        if isinstance(key, tuple):
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            errors[rname(*key)] = errors.pop(key)
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    return ValidationError(getattr(entity, 'eid', entity), errors,
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                           substitutions, i18nvalues)