# copyright 2003-2011 LOGILAB S.A. (Paris, FRANCE), all rights reserved.

# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr

#

# This file is part of CubicWeb.

#

# CubicWeb is free software: you can redistribute it and/or modify it under the

# terms of the GNU Lesser General Public License as published by the Free

# Software Foundation, either version 2.1 of the License, or (at your option)

# any later version.

#

# CubicWeb is distributed in the hope that it will be useful, but WITHOUT

# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS

# FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more

# details.

#

# You should have received a copy of the GNU Lesser General Public License along

# with CubicWeb.  If not, see <http://www.gnu.org/licenses/>.

"""This package contains all WSGI specific code for cubicweb

NOTE: this package borrows a lot of code to Django

      (http://www.djangoproject.com) and to the wsgiref module

      of the python2.5's stdlib.

WSGI corresponding PEP: http://www.python.org/dev/peps/pep-0333/

"""

from email import message, message_from_string

from pprint import pformat as _pformat

def pformat(obj):

    """pretty prints `obj` if possible"""

    try:

        return _pformat(obj)

    except Exception:

        return u'<could not parse>'

def normalize_header(header):

    """returns a normalized header name

    >>> normalize_header('User_Agent')

    'User-agent'

    """

    return header.replace('_', '-').capitalize()

def safe_copyfileobj(fsrc, fdst, length=16*1024, size=0):

    """

    THIS COMES FROM DJANGO

    A version of shutil.copyfileobj that will not read more than 'size' bytes.

    This makes it safe from clients sending more than CONTENT_LENGTH bytes of

    data in the body.

    """

    if not size:

        return

    while size > 0:

        buf = fsrc.read(min(length, size))

        if not buf:

            break

        fdst.write(buf)

        size -= len(buf)