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utils.py

import sys
import os
import socket
from random import random
from time import time
from inspect import getargs, getmro
from md5 import md5
from types import ClassType, MethodType
from zope.i18nmessageid import Message
from UserDict import UserDict as BaseDict

from AccessControl import ClassSecurityInfo
from AccessControl.SecurityInfo import ACCESS_PUBLIC

from Acquisition import aq_base
from ExtensionClass import ExtensionClass
from Globals import InitializeClass
from Products.CMFCore.utils import getToolByName
from Products.Archetypes.debug import log
from Products.Archetypes.debug import deprecated
from Products.Archetypes.config import DEBUG_SECURITY
from Products.statusmessages.interfaces import IStatusMessage

# BBB, this can be removed once we do not support PTS anymore
from Products.PageTemplates.GlobalTranslationService \
     import getGlobalTranslationService as getGTS

from Interface.bridge import createZope3Bridge
from Products.Five.fiveconfigure import createZope2Bridge
def makeBridgeMaker(func):
    def makeBridge(*args):
        module=args[0]
        ifaces = args[1:]
        for iface in ifaces:
            func(iface, module, iface.__name__)
    return makeBridge

makeZ2Bridges=makeBridgeMaker(createZope2Bridge)
makeZ3Bridges=makeBridgeMaker(createZope3Bridge)

try:
    _v_network = str(socket.gethostbyname(socket.gethostname()))
except:
    _v_network = str(random() * 100000000000000000L)

def make_uuid(*args):
    t = str(time() * 1000L)
    r = str(random()*100000000000000000L)
    data = t +' '+ r +' '+ _v_network +' '+ str(args)
    uid = md5(data).hexdigest()
    return uid

# linux kernel uid generator. It's a little bit slower but a little bit better
KERNEL_UUID = '/proc/sys/kernel/random/uuid'

if os.path.isfile(KERNEL_UUID):
    HAS_KERNEL_UUID = True
    def uuid_gen():
        fp = open(KERNEL_UUID, 'r')
        while 1:
            uid = fp.read()[:-1]
            fp.seek(0)
            yield uid
    uid_gen = uuid_gen()

    def kernel_make_uuid(*args):
        return uid_gen.next()
else:
    HAS_KERNEL_UUID = False
    kernel_make_uuid = make_uuid


def fixSchema(schema):
    """Fix persisted schema from AT < 1.3 (UserDict-based)
    to work with the new fixed order schema."""
    from Products.Archetypes.Schema import Schemata
    if not hasattr(aq_base(schema), '_fields'):
        fields = schema.data.values()
        Schemata.__init__(schema, fields)
        del schema.data
    return schema

_marker = []

def mapply(method, *args, **kw):
    """ Inspect function and apply positional and keyword arguments as possible.

    Add more examples.

    >>> def f(a, b, c=2, d=3):
    ...     print a, b, c, d

    >>> mapply(f, *(1, 2), **{'d':4})
    1 2 2 4

    >>> mapply(f, *(1, 2), **{'c':3})
    1 2 3 3

    >>> mapply(f, *(1, 2), **{'j':3})
    1 2 2 3

    >>> def f(a, b):
    ...     print a, b

    >>> mapply(f, *(1, 2), **{'j':3})
    1 2

    >>> def f(a, b=2):
    ...     print a, b

    >>> mapply(f, *(1,), **{'j':3})
    1 2

    >>> mapply(f, *(1,), **{'j':3})
    1 2

    TODO Should raise an exception 'Multiple values for argument' here.

    >>> mapply(f, *(1,), **{'a':3})
    1 2

    >>> mapply(f, *(1,), **{'b':3})
    1 3

    >>> def f(a=1, b=2):
    ...     print a, b

    >>> mapply(f, *(), **{'b':3})
    1 3

    >>> mapply(f, *(), **{'a':3})
    3 2
    """
    m = method
    if hasattr(m, 'im_func'):
        m = m.im_func
    code = m.func_code
    fn_args = getargs(code)
    call_args = list(args)
    if fn_args[1] is not None and fn_args[2] is not None:
        return method(*args, **kw)
    if fn_args[1] is None:
        if len(call_args) > len(fn_args[0]):
            call_args = call_args[:len(fn_args[0])]
    nkw = {}
    if len(call_args) < len(fn_args[0]):
        for arg in fn_args[0][len(call_args):]:
            value = kw.get(arg, _marker)
            if value is not _marker:
                nkw[arg] = value
                del kw[arg]
    largs = len(call_args) + len(nkw.keys())
    if largs < len(fn_args[0]):
        for arg in fn_args[0][largs:]:
            value = kw.get(arg, _marker)
            if value is not _marker:
                call_args.append(value)
                del kw[arg]
    if fn_args[2] is not None:
        return method(*call_args, **kw)
    if fn_args[0]:
        return method(*call_args, **nkw)
    return method()

def className(klass):
    if type(klass) not in [ClassType, ExtensionClass]:
        klass = klass.__class__
    return "%s.%s" % (klass.__module__, klass.__name__)

def productDir():
    module = sys.modules[__name__]
    return os.path.dirname(module.__file__)

def pathFor(path=None, file=None):
    base = productDir()
    if path:
        base = os.path.join(base, path)
    if file:
        base = os.path.join(base, file)

    return base

def capitalize(string):
    if string[0].islower():
        string = string[0].upper() + string[1:]
    return string

def findDict(listofDicts, key, value):
    #Look at a list of dicts for one where key == value
    for d in listofDicts:
        if d.has_key(key):
            if d[key] == value:
                return d
    return None


def basename(path):
    return path[max(path.rfind('\\'), path.rfind('/'))+1:]

def unique(s):
    """Return a list of the elements in s, but without duplicates.

    For example, unique([1,2,3,1,2,3]) is some permutation of [1,2,3],
    unique("abcabc") some permutation of ["a", "b", "c"], and
    unique(([1, 2], [2, 3], [1, 2])) some permutation of
    [[2, 3], [1, 2]].

    For best speed, all sequence elements should be hashable.  Then
    unique() will usually work in linear time.

    If not possible, the sequence elements should enjoy a total
    ordering, and if list(s).sort() doesn't raise TypeError it's
    assumed that they do enjoy a total ordering.  Then unique() will
    usually work in O(N*log2(N)) time.

    If that's not possible either, the sequence elements must support
    equality-testing.  Then unique() will usually work in quadratic
    time.
    """
    # taken from ASPN Python Cookbook,
    # http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/52560

    n = len(s)
    if n == 0:
        return []

    # Try using a dict first, as that's the fastest and will usually
    # work.  If it doesn't work, it will usually fail quickly, so it
    # usually doesn't cost much to *try* it.  It requires that all the
    # sequence elements be hashable, and support equality comparison.
    u = {}
    try:
        for x in s:
            u[x] = 1
    except TypeError:
        del u  # move on to the next method
    else:
        return u.keys()

    # We can't hash all the elements.  Second fastest is to sort,
    # which brings the equal elements together; then duplicates are
    # easy to weed out in a single pass.
    # NOTE:  Python's list.sort() was designed to be efficient in the
    # presence of many duplicate elements.  This isn't true of all
    # sort functions in all languages or libraries, so this approach
    # is more effective in Python than it may be elsewhere.
    try:
        t = list(s)
        t.sort()
    except TypeError:
        del t  # move on to the next method
    else:
        assert n > 0
        last = t[0]
        lasti = i = 1
        while i < n:
            if t[i] != last:
                t[lasti] = last = t[i]
                lasti += 1
            i += 1
        return t[:lasti]

    # Brute force is all that's left.
    u = []
    for x in s:
        if x not in u:
            u.append(x)
    return u



00272 class DisplayList:
    """Static display lists, can look up on
    either side of the dict, and get them in sorted order

    NOTE: Both keys and values *must* contain unique entries! You can have
    two times the same value. This is a "feature" not a bug. DisplayLists
    are meant to be used as a list inside html form entry like a drop down.

    >>> dl = DisplayList()

    Add some keys
    >>> dl.add('foo', 'bar')
    >>> dl.add('egg', 'spam')

    Assert some values
    >>> dl.index
    2
    >>> dl.keys()
    ['foo', 'egg']
    >>> dl.values()
    ['bar', 'spam']
    >>> dl.items()
    (('foo', 'bar'), ('egg', 'spam'))

    You can't use e.g. objects as keys or values
    >>> dl.add(object(), 'error')
    Traceback (most recent call last):
    TypeError: DisplayList keys must be strings or ints, got <type 'object'>

    >>> dl.add('error', object())
    Traceback (most recent call last):
    TypeError: DisplayList values must be strings or ints, got <type 'object'>

    GOTCHA
    Adding a value a second time does overwrite the key, too!
    >>> dl.add('fobar' ,'spam')
    >>> dl.keys()
    ['foo', 'fobar']

    >>> dl.items()
    (('foo', 'bar'), ('fobar', 'spam'))

    Install warning hook for the next tests since they will raise a warning
    and I don't want to spoil the logs.
    >>> from Testing.ZopeTestCase import WarningsHook
    >>> w = WarningsHook(); w.install()

    Using ints as DisplayList keys works but will raise an deprecation warning
    You should use IntDisplayList for int keys

    >>> idl = DisplayList()
    >>> idl.add(1, 'number one')
    >>> idl.add(2, 'just the second')

    >>> idl.items()
    ((1, 'number one'), (2, 'just the second'))

    Remove warning hook
    >>> w.uninstall(); del w
    """

    security = ClassSecurityInfo()
    security.setDefaultAccess('allow')

    def __init__(self, data=None):
        self._keys = {}
        self._i18n_msgids = {}
        self._values = {}
        self._itor   = []
        self.index = 0
        if data:
            self.fromList(data)

    def __repr__(self):
        return '<DisplayList %s at %s>' % (self[:], id(self))

    def __str__(self):
        return str(self[:])

    def __call__(self):
        return self

    def fromList(self, lst):
        for item in lst:
            if isinstance(item, list):
                item = tuple(item)
            self.add(*item)

    def __len__(self):
        return self.index

    def __add__(self, other):
        a = tuple(self.items())
        if hasattr(other, 'items'):
            b = other.items()
        else: #assume a seq
            b = tuple(zip(other, other))

        msgids = self._i18n_msgids
        msgids.update(getattr(other, '_i18n_msgids', {}))

        v = DisplayList(a + b)
        v._i18n_msgids = msgids
        return v

    def index_sort(self, a, b):
        return  a[0] - b[0]

    def add(self, key, value, msgid=None):
        if isinstance(key, int):
            deprecated('Using ints as DisplayList keys is deprecated (add)')
        if not isinstance(key, basestring) and not isinstance(key, int):
            raise TypeError('DisplayList keys must be strings or ints, got %s' %
                            type(key))
        if not isinstance(value, basestring) and not isinstance(value, int):
            raise TypeError('DisplayList values must be strings or ints, got %s' %
                            type(value))
        if msgid is not None:
            deprecated('Using explicit msgids for DisplayLists is deprecated. '
                        'Store Zope3 Messages as values directly.')
            if not isinstance(msgid, basestring):
                raise TypeError('DisplayList msg ids must be strings, got %s' %
                                type(msgid))
        self.index +=1
        k = (self.index, key)
        v = (self.index, value)

        self._keys[key] = v
        self._values[value] = k
        self._itor.append(key)
        if msgid is not None:
            self._i18n_msgids[key] = msgid

00405     def getKey(self, value, default=None):
        """get key"""
        v = self._values.get(value, None)
        if v: return v[1]
        for k, v in self._values.items():
            if repr(value) == repr(k):
                return v[1]
        return default

    def getValue(self, key, default=None):
        "get value"
        if isinstance(key, int):
            deprecated('Using ints as DisplayList keys is deprecated (getValue)')
        if not isinstance(key, basestring) and not isinstance(key, int):
            raise TypeError('DisplayList keys must be strings or ints, got %s' %
                            type(key))
        v = self._keys.get(key, None)
        if v: return v[1]
        for k, v in self._keys.items():
            if repr(key) == repr(k):
                return v[1]
        return default

    def getMsgId(self, key):
        "get i18n msgid"
        deprecated('DisplayList getMsgId is deprecated. Store Zope3 Messages '
                   'as values instead.')
        if isinstance(key, int):
            deprecated('Using ints as DisplayList keys is deprecated (msgid)')
        if not isinstance(key, basestring) and not isinstance(key, int):
            raise TypeError('DisplayList keys must be strings or ints, got %s' %
                            type(key))
        if self._i18n_msgids.has_key(key):
            return self._i18n_msgids[key]
        else:
            return self._keys[key][1]

    def keys(self):
        "keys"
        kl = self._values.values()
        kl.sort(self.index_sort)
        return [k[1] for k in kl]

    def values(self):
        "values"
        vl = self._keys.values()
        vl.sort(self.index_sort)
        return [v[1] for v in vl]

00454     def items(self):
        """items"""
        keys = self.keys()
        return tuple([(key, self.getValue(key)) for key in keys])

00459     def sortedByValue(self):
        """return a new display list sorted by value"""
        def _cmp(a, b):
            return cmp(a[1], b[1])
        values = list(self.items())
        values.sort(_cmp)
        return DisplayList(values)

00467     def sortedByKey(self):
        """return a new display list sorted by key"""
        def _cmp(a, b):
            return cmp(a[0], b[0])
        values = list(self.items())
        values.sort(_cmp)
        return DisplayList(values)

    def __cmp__(self, dest):
        if not isinstance(dest, DisplayList):
            raise TypeError, 'Cant compare DisplayList to %s' % (type(dest))

        return cmp(self.sortedByKey()[:], dest.sortedByKey()[:])

    def __getitem__(self, key):
        #Ok, this is going to pass a number
        #which is index but not easy to get at
        #with the data-struct, fix when we get real
        #itor/generators
        return self._itor[key]

    def __getslice__(self,i1,i2):
        r=[]
        for i in xrange(i1,i2):
            try: r.append((self._itor[i], self.getValue(self._itor[i]),))
            except IndexError: return r
        return DisplayList(r)

    slice=__getslice__

InitializeClass(DisplayList)

00499 class IntDisplayList(DisplayList):
    """Static display lists for integer keys, can look up on
    either side of the dict, and get them in sorted order

    The IntDisplayList can be used with integer values only. You should use it
    in favor of a DisplayList if you want to use ints as keys. The support for
    ints as keys for the ordinary DisplayList will be dropped in the next
    release.

    NOTE: Both keys and values *must* contain unique entries! You can have
    two times the same value. This is a "feature" not a bug. DisplayLists
    are meant to be used as a list inside html form entry like a drop down.

    >>> idl = IntDisplayList()

    Add some keys
    >>> idl.add(1, 'number one')
    >>> idl.add(2, 'just the second')

    Assert some values
    >>> idl.index
    2
    >>> idl.keys()
    [1, 2]
    >>> idl.values()
    ['number one', 'just the second']
    >>> idl.items()
    ((1, 'number one'), (2, 'just the second'))

    You can use only ints as keys
    >>> idl.add(object(), 'error')
    Traceback (most recent call last):
    TypeError: DisplayList keys must be ints, got <type 'object'>

    >>> idl.add(42, object())
    Traceback (most recent call last):
    TypeError: DisplayList values must be strings or ints, got <type 'object'>

    >>> idl.add('stringkey', 'error')
    Traceback (most recent call last):
    TypeError: DisplayList keys must be ints, got <type 'str'>

    >>> idl.add(u'unicodekey', 'error')
    Traceback (most recent call last):
    TypeError: DisplayList keys must be ints, got <type 'unicode'>

    GOTCHA
    Adding a value a second time does overwrite the key, too!
    >>> idl.add(3 , 'just the second')
    >>> idl.keys()
    [1, 3]
    >>> idl.items()
    ((1, 'number one'), (3, 'just the second'))

    It is possible to get the value also by a stringified int
    >>> idl.getValue("1")
    'number one'
    >>> idl.getValue(u"1")
    'number one'
    """

    security = ClassSecurityInfo()
    security.setDefaultAccess('allow')

    def add(self, key, value, msgid=None):
        if not isinstance(key, int):
            raise TypeError('DisplayList keys must be ints, got %s' %
                            type(key))
        if not isinstance(value, basestring) and not isinstance(value, int):
            raise TypeError('DisplayList values must be strings or ints, got %s' %
                            type(value))
        if msgid is not None:
            deprecated('Using explicit msgids for IntDisplayLists is deprecated. '
                        'Store Zope3 Messages as values directly.')
            if not isinstance(msgid, basestring):
                raise TypeError('DisplayList msg ids must be strings, got %s' %
                                type(msgid))
        self.index +=1
        k = (self.index, key)
        v = (self.index, value)

        self._keys[key] = v
        self._values[value] = k
        self._itor.append(key)
        if msgid is not None:
            self._i18n_msgids[key] = msgid

00586     def getValue(self, key, default=None):
        """get value"""
        if isinstance(key, basestring):
            key = int(key)
        elif isinstance(key, int):
            pass
        else:
            raise TypeError("Key must be string or int")
        v = self._keys.get(key, None)
        if v: return v[1]
        for k, v in self._keys.items():
            if repr(key) == repr(k):
                return v[1]
        return default

    def getMsgId(self, key):
        "get i18n msgid"
        deprecated('IntDisplayList getMsgId is deprecated. Store Zope3 Messages'
                   ' as values instead.')
        if isinstance(key, basestring):
            key = int(key)
        elif isinstance(key, int):
            pass
        else:
            raise TypeError("Key must be string or int")
        if self._i18n_msgids.has_key(key):
            return self._i18n_msgids[key]
        else:
            return self._keys[key][1]

00616 class Vocabulary(DisplayList):
    """
    Wrap DisplayList class and add internationalisation
    """

    security = ClassSecurityInfo()
    security.setDefaultAccess('allow')

    def __init__(self, display_list, instance, i18n_domain):
        self._keys = display_list._keys
        self._i18n_msgids = display_list._i18n_msgids
        self._values = display_list._values
        self._itor   = display_list._itor
        self.index = display_list.index
        self._instance = instance
        self._i18n_domain = i18n_domain

00633     def getValue(self, key, default=None):
        """
        Get i18n value
        """
        if isinstance(key, int):
            deprecated('Using ints as DisplayList keys is deprecated (getValue)')
        if not isinstance(key, basestring) and not isinstance(key, int):
            raise TypeError('DisplayList keys must be strings or ints, got %s' %
                            type(key))
        v = self._keys.get(key, None)
        value = default
        if v:
            value = v[1]
        else:
            for k, v in self._keys.items():
                if repr(key) == repr(k):
                    value = v[1]
                    break

        if self._i18n_domain and self._instance:
            msg = self._i18n_msgids.get(key, None) or value

            if isinstance(msg, Message):
                return msg

            if not msg:
                return ''

            return getGTS().translate(self._i18n_domain, msg,
                                      context=self._instance, default=value)
        else:
            return value

InitializeClass(Vocabulary)

00668 class OrderedDict(BaseDict):
    """A wrapper around dictionary objects that provides an ordering for
       keys() and items()."""

    security = ClassSecurityInfo()
    security.setDefaultAccess('allow')

    def __init__(self, dict=None):  
        self._keys = [] 
        BaseDict.__init__(self, dict)     
        if dict is not None:  
            self._keys = self.data.keys()

    def __setitem__(self, key, item):
        if not self.data.has_key(key):
            self._keys.append(key)
        return BaseDict.__setitem__(self, key, item)

    def __delitem__(self, key):
        BaseDict.__delitem__(self, key)
        self._keys.remove(key)

    def clear(self):
        BaseDict.clear(self)
        self._keys = []

    def keys(self):
        return self._keys

    def items(self):
        return [(k, self.get(k)) for k in self._keys]

    def reverse(self):
        items = list(self.items())
        items.reverse()
        return items

    def values(self):
        return [self.get(k) for k in self._keys]

    def update(self, dict):
        for k in dict.keys():
            if not self.data.has_key(k):
                self._keys.append(k)
        return BaseDict.update(self, dict)

    def copy(self):
        if self.__class__ is OrderedDict:
            c = OrderedDict()
            for k, v in self.items():
                c[k] = v
            return c
        import copy
        c = copy.copy(self)
        return c

    def setdefault(self, key, failobj=None):
        if not self.data.has_key(key):
            self._keys.append(key)
        return BaseDict.setdefault(self, key, failobj)

    def popitem(self):
        if not self.data:
            raise KeyError, 'dictionary is empty'
        k = self._keys.pop()
        v = self.data.get(k)
        del self.data[k]
        return (k, v)

    def pop(self, key):
        v = self.data.pop(key) # will raise KeyError if needed
        self._keys.remove(key)
        return v

InitializeClass(OrderedDict)


def getRelPath(self, ppath):
    """take something with context (self) and a physical path as a
    tuple, return the relative path for the portal"""
    urlTool = getToolByName(self, 'portal_url')
    portal_path = urlTool.getPortalObject().getPhysicalPath()
    ppath = ppath[len(portal_path):]
    return ppath

def getRelURL(self, ppath):
    return '/'.join(getRelPath(self, ppath))

def getPkgInfo(product):
    """Get the __pkginfo__ from a product

    chdir before importing the product
    """
    prd_home = product.__path__[0]
    cur_dir = os.path.abspath(os.curdir)
    os.chdir(prd_home)
    pkg = __import__('%s.__pkginfo__' % product.__name__, product, product,
                      ['__pkginfo__'])
    os.chdir(cur_dir)
    return pkg

def shasattr(obj, attr, acquire=False):
    """Safe has attribute method

    * It's acquisition safe by default because it's removing the acquisition
      wrapper before trying to test for the attribute.

    * It's not using hasattr which might swallow a ZODB ConflictError (actually
      the implementation of hasattr is swallowing all exceptions). Instead of
      using hasattr it's comparing the output of getattr with a special marker
      object.

    TODO the getattr() trick can be removed when Python's hasattr() is fixed to
    catch only AttributeErrors.

    Quoting Shane Hathaway:

    That said, I was surprised to discover that Python 2.3 implements hasattr
    this way (from bltinmodule.c):

            v = PyObject_GetAttr(v, name);
            if (v == NULL) {
                    PyErr_Clear();
                    Py_INCREF(Py_False);
                    return Py_False;
            }
        Py_DECREF(v);
        Py_INCREF(Py_True);
        return Py_True;

    It should not swallow all errors, especially now that descriptors make
    computed attributes quite common.  getattr() only recently started catching
    only AttributeErrors, but apparently hasattr is lagging behind.  I suggest
    the consistency between getattr and hasattr should be fixed in Python, not
    Zope.

    Shane
    """
    if not acquire:
        obj = aq_base(obj)
    return getattr(obj, attr, _marker) is not _marker


WRAPPER = '__at_is_wrapper_method__'
ORIG_NAME = '__at_original_method_name__'
def isWrapperMethod(meth):
    return getattr(meth, WRAPPER, False)

def call_original(self, __name__, __pattern__, *args, **kw):
    return getattr(self, __pattern__ % __name__)(*args, **kw)

def wrap_method(klass, name, method, pattern='__at_wrapped_%s__'):
    old_method = getattr(klass, name)
    if isWrapperMethod(old_method):
        log('Already wrapped method %s.%s. Skipping.' % (klass.__name__, name))
        return
    new_name = pattern % name
    setattr(klass, new_name, old_method)
    setattr(method, ORIG_NAME, new_name)
    setattr(method, WRAPPER, True)
    setattr(klass, name, method)

def unwrap_method(klass, name):
    old_method = getattr(klass, name)
    if not isWrapperMethod(old_method):
        raise ValueError, ('Non-wrapped method %s.%s' % (klass.__name__, name))
    orig_name = getattr(old_method, ORIG_NAME)
    new_method = getattr(klass, orig_name)
    delattr(klass, orig_name)
    setattr(klass, name, new_method)


def _get_position_after(label, options):
    position = 0
    for item in options:
        if item['label'] != label:
            continue
        position += 1
    return position

def insert_zmi_tab_before(label, new_option, options):
    _options = list(options)
    position = _get_position_after(label, options)
    _options.insert(position-1, new_option)
    return tuple(_options)

def insert_zmi_tab_after(label, new_option, options):
    _options = list(options)
    position = _get_position_after(label, options)
    _options.insert(position, new_option)
    return tuple(_options)

def _getSecurity(klass, create=True):
    # a Zope 2 class can contain some attribute that is an instance
    # of ClassSecurityInfo. Zope 2 scans through things looking for
    # an attribute that has the name __security_info__ first
    info = vars(klass)
    security = None
    for k, v in info.items():
        if hasattr(v, '__security_info__'):
            security = v
            break
    # Didn't found a ClassSecurityInfo object
    if security is None:
        if not create:
            return None
        # we stuff the name ourselves as __security__, not security, as this
        # could theoretically lead to name clashes, and doesn't matter for
        # zope 2 anyway.
        security = ClassSecurityInfo()
        setattr(klass, '__security__', security)
        if DEBUG_SECURITY:
            print '%s has no ClassSecurityObject' % klass.__name__
    return security

def mergeSecurity(klass):
    # This method looks into all the base classes and tries to
    # merge the security declarations into the current class.
    # Not needed in normal circumstances, but useful for debugging.
    bases = list(getmro(klass))
    bases.reverse()
    security = _getSecurity(klass)
    for base in bases[:-1]:
        s = _getSecurity(base, create=False)
        if s is not None:
            if DEBUG_SECURITY:
                print base, s.names, s.roles
            # Apply security from the base classes to this one
            s.apply(klass)
            continue
        cdict = vars(base)
        b_perms = cdict.get('__ac_permissions__', ())
        if b_perms and DEBUG_SECURITY:
            print base, b_perms
        for item in b_perms:
            permission_name = item[0]
            security._setaccess(item[1], permission_name)
            if len(item) > 2:
                security.setPermissionDefault(permission_name, item[2])
        roles = [(k, v) for k, v in cdict.items() if k.endswith('__roles__')]
        for k, v in roles:
            name = k[:-9]
            security.names[name] = v

def setSecurity(klass, defaultAccess=None, objectPermission=None):
    """Set security of classes

    * Adds ClassSecurityInfo if necessary
    * Sets default access ('deny' or 'allow')
    * Sets permission of objects
    """
    security = _getSecurity(klass)
    if defaultAccess:
        security.setDefaultAccess(defaultAccess)
    if objectPermission:
        if objectPermission == 'public':
            security.declareObjectPublic()
        elif objectPermission == 'private':
            security.declareObjectPrivate()
        else:
            security.declareObjectProtected(objectPermission)

    InitializeClass(klass)

    if DEBUG_SECURITY:
        if getattr(klass, '__allow_access_to_unprotected_subobjects__', False):
            print '%s: Unprotected access is allowed: %s' % (
                  klass.__name__, klass.__allow_access_to_unprotected_subobjects__)
        for name in klass.__dict__.keys():
            method = getattr(klass, name)
            if name.startswith('_') or type(method) != MethodType:
                continue
            if not security.names.has_key(name):
                print '%s.%s has no security' % (klass.__name__, name)
            elif security.names.get(name) is ACCESS_PUBLIC:
                print '%s.%s is public' % (klass.__name__, name)

def contentDispositionHeader(disposition, charset='utf-8', language=None, **kw):
    """Return a properly quoted disposition header

    Originally from CMFManagedFile/content.py.
    charset default changed to utf-8 for consistency with the rest of Archetypes.
    """

    from email.Message import Message as emailMessage

    for key, value in kw.items():
        # stringify the value
        if isinstance(value, unicode):
            value = value.encode(charset)
        else:
            value = str(value)
            # raise an error if the charset doesn't match
            unicode(value, charset, 'strict')
        # if any value contains 8-bit chars, make it an
        # encoding 3-tuple for special treatment by
        # Message.add_header() (actually _formatparam())
        try:
            unicode(value, 'us-ascii', 'strict')
        except UnicodeDecodeError:
            value = (charset, language, value)

    m = emailMessage()
    m.add_header('content-disposition', disposition, **kw)
    return m['content-disposition']

def addStatusMessage(request, message, type='info'):
    """Add a status message to the request.
    """
    IStatusMessage(request).addStatusMessage(message, type=type)

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