from zope.publisher.http import HTTPRequest
from zope.publisher.browser import BrowserRequest
from zope.publisher.xmlrpc import XMLRPCRequest
from zope.interface import directlyProvides

from zope.app import zapi
from zope.app.publication.httpfactory import HTTPPublicationRequestFactory

_browser_methods = 'GET', 'POST', 'HEAD'

# TODO make this configurable through a ZConfig file
_dav_user_agents = ['cadaver/0.22.2 neon/0.24.7',
                    'cadaver/0.20.5 neon/0.23.9',
                    'neon/0.23.9 cadaver/0.20.5']

class DAVUserAgentFactory31(HTTPPublicationRequestFactory):

    def __call__(self, input_stream, output_steam, env):
        """See `zope.app.publication.interfaces.IPublicationRequestFactory`"""
        method = env.get('REQUEST_METHOD', 'GET').upper()

        # only make a distinction if we're dealing with browser
        # methods at all
        if method not in _browser_methods:
            request = HTTPRequest(input_stream, output_steam, env)
            request.setPublication(self._http)
            return request

        content_type = env.get('CONTENT_TYPE', '')
        is_xml = content_type.startswith('text/xml')
 
        if (method == 'POST' and is_xml):
            # soap
            if (env.get('HTTP_SOAPACTION', None)
                and self._soapreq is not None):
                request = self._soapreq(input_stream, output_steam, env)
                request.setPublication(self._soappub)
                return request
            request = XMLRPCRequest(input_stream, output_steam, env)
            request.setPublication(self._xmlrpc)
            return request

        # check if we have a distinguished DAV client
        user_agent = env.get('HTTP_USER_AGENT', '')
        # TODO saner detection logic
        if user_agent in _dav_user_agents:
            request = HTTPRequest(input_stream, output_steam, env)
            request.setPublication(self._http)
            return request

        # fallback to a regular browser request:
        request = BrowserRequest(input_stream, output_steam, env)
        request.setPublication(self._brower)
        # Set the default skin
        adapters = zapi.getSiteManager().adapters
        skin = adapters.lookup((providedBy(request),), IDefaultSkin, '')
        if skin is not None:
            directlyProvides(request, directlyProvidedBy(request)+skin)
        else:
            directlyProvides(request, IDefaultBrowserLayer)