import time
from xml.dom import minidom

DAV_NS = "DAV:"

def childElements(node, name=None, ns=None):
    nodes = []
    for n in node.childNodes:
        if (n.nodeType == n.ELEMENT_NODE and
            ((name is None) or ((n.localName.lower())==name)) and
            ((ns is None) or (n.namespaceURI==ns))):
            nodes.append(n)
    return nodes

class DummyLock(object):

    def __init__(self, context, request):
        self.context = context
        self.request = request

    def LOCK(self):
        # get the lock scope and type from the incoming request
        data = self.request.bodyFile
        data.seek(0)
        request = minidom.parse(data)

        lockinfo = childElements(request, 'lockinfo', ns=DAV_NS)[0]
        lockscope = childElements(lockinfo, 'lockscope', ns=DAV_NS)[0]
        locktype = childElements(lockinfo, 'locktype', ns=DAV_NS)[0]

        scope = childElements(lockscope)[0].localName
        type = childElements(locktype)[0].localName

        # stub values for everything else
        owner = ''
        timeout = 'Second-3600'
        token = 'opaquelocktoken:' + str(time.time())
        depth = 0

        body = """\
<?xml version="1.0" encoding="utf-8" ?>
<prop xmlns="DAV:">
<lockdiscovery>
  <activelock>
    <locktype><%(locktype)s/></locktype>
    <lockscope><%(lockscope)s/></lockscope>
    <depth>%(depth)s</depth>
    <owner>%(owner)s</owner>
    <timeout>%(timeout)s</timeout>
    <locktoken><href>%(token)s</href></locktoken>
  </activelock>
</lockdiscovery>
</prop>""" % {
            'locktype': type,
            'lockscope': scope,
            'depth': depth,
            'owner': owner,
            'timeout': timeout,
            'token': token,
            }
        self.request.response.setHeader('Lock-Token', token)
        return body

    def UNLOCK(self):
        self.request.response.setStatus(204)
        return ''