wsgi/__init__.py
author Sylvain Thénault <sylvain.thenault@logilab.fr>
Fri, 12 Mar 2010 10:46:28 +0100
branchstable
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"""This package contains all WSGI specific code for cubicweb
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NOTE: this package borrows a lot of code to Django
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      (http://www.djangoproject.com) and to the wsgiref module
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      of the python2.5's stdlib.
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WSGI corresponding PEP: http://www.python.org/dev/peps/pep-0333/
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:organization: Logilab
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:copyright: 2008-2010 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: GNU Lesser General Public License, v2.1 - http://www.gnu.org/licenses
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"""
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__docformat__ = "restructuredtext en"
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from email import message, message_from_string
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from Cookie import SimpleCookie
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from StringIO import StringIO
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from cgi import parse_header, parse_qsl
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from pprint import pformat as _pformat
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def pformat(obj):
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    """pretty prints `obj` if possible"""
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    try:
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        return _pformat(obj)
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    except:
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        return u'<could not parse>'
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def qs2dict(qs):
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    """transforms a query string into a regular python dict"""
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    result = {}
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    for key, value in parse_qsl(qs, True):
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        result.setdefault(key, []).append(value)
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    return result
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def normalize_header(header):
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    """returns a normalized header name
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    >>> normalize_header('User_Agent')
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    'User-agent'
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    """
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    return header.replace('_', '-').capitalize()
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def safe_copyfileobj(fsrc, fdst, length=16*1024, size=0):
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    """
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    THIS COMES FROM DJANGO
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    A version of shutil.copyfileobj that will not read more than 'size' bytes.
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    This makes it safe from clients sending more than CONTENT_LENGTH bytes of
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    data in the body.
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    """
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    if not size:
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        return
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    while size > 0:
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        buf = fsrc.read(min(length, size))
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        if not buf:
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            break
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        fdst.write(buf)
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        size -= len(buf)
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def parse_file_upload(header_dict, post_data):
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    """This is adapted FROM DJANGO"""
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    raw_message = '\r\n'.join('%s:%s' % pair for pair in header_dict.iteritems())
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    raw_message += '\r\n\r\n' + post_data
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    msg = message_from_string(raw_message)
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    post, files = {}, {}
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    for submessage in msg.get_payload():
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        name_dict = parse_header(submessage['Content-Disposition'])[1]
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        key = name_dict['name']
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        # name_dict is something like {'name': 'file', 'filename': 'test.txt'} for file uploads
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        # or {'name': 'blah'} for POST fields
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        # We assume all uploaded files have a 'filename' set.
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        if 'filename' in name_dict:
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            assert type([]) != type(submessage.get_payload()), "Nested MIME messages are not supported"
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            if not name_dict['filename'].strip():
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                continue
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            # IE submits the full path, so trim everything but the basename.
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            # (We can't use os.path.basename because that uses the server's
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            # directory separator, which may not be the same as the
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            # client's one.)
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            filename = name_dict['filename'][name_dict['filename'].rfind("\\")+1:]
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            mimetype = 'Content-Type' in submessage and submessage['Content-Type'] or None
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            content = StringIO(submessage.get_payload())
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            files[key] = [filename, mimetype, content]
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        else:
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            post.setdefault(key, []).append(submessage.get_payload())
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    return post, files