text: # -*- test-case-name: twisted.web.
  # Copyright (c) Twisted Matrix Laboratories.
  # See LICENSE for details.
  
  """
  I am a virtual hosts implementation.
  """
  
  
  # Twisted Imports
  from twisted.python import roots
  from twisted.web import resource
  
  
  class VirtualHostCollection(roots.Homogenous):
      """Wrapper for virtual hosts collection.
  
      This exists for configuration purposes.
      """
  
      entityType = resource.Resource
  
      def __init__(self, nvh):
          self.nvh = nvh
  
      def listStaticEntities(self):
          return self.nvh.hosts.items()
  
      def getStaticEntity(self, name):
          return self.nvh.hosts.get(self)
  
      def reallyPutEntity(self, name, entity):
          self.nvh.addHost(name, entity)
  
      def delEntity(self, name):
          self.nvh.removeHost(name)
  
  
  class NameVirtualHost(resource.Resource):
      """I am a resource which represents named virtual hosts."""
  
      default = None
  
      def __init__(self):
          """Initialize."""
          resource.Resource.__init__(self)
          self.hosts = {}
  
      def listStaticEntities(self):
          return resource.Resource.listStaticEntities(self) + [
              ("Virtual Hosts", VirtualHostCollection(self))
          ]
  
      def getStaticEntity(self, name):
          if name == "Virtual Hosts":
              return VirtualHostCollection(self)
          else:
              return resource.Resource.getStaticEntity(self, name)
  
      def addHost(self, name, resrc):
          """Add a host to this virtual host.
  
          This will take a host named `name', and map it to a resource
          `resrc'.  For example, a setup for our virtual hosts would be::
  
              nvh.addHost('divunal.com', divunalDirectory)
              nvh.addHost('www.divunal.com', divunalDirectory)
              nvh.addHost('twistedmatrix.com', twistedMatrixDirectory)
              nvh.addHost('www.twistedmatrix.com', twistedMatrixDirectory)
          """
          self.hosts[name] = resrc
  
      def removeHost(self, name):
          """Remove a host."""
          del self.hosts[name]
  
      def _getResourceForRequest(self, request):
          """(Internal) Get the appropriate resource for the given host."""
          hostHeader = request.getHeader(b"host")
          if hostHeader == None:
              return self.default or resource.NoResource()
          else:
              host = hostHeader.lower().split(b":", 1)[0]
          return self.hosts.get(host, self.default) or resource.NoResource(
              "host %s not in vhost map" % repr(host)
          )
  
      def render(self, request):
          """Implementation of resource.Resource's render method."""
          resrc = self._getResourceForRequest(request)
          return resrc.render(request)
  
      def getChild(self, path, request):
          """Implementation of resource.Resource's getChild method."""
          resrc = self._getResourceForRequest(request)
          if resrc.isLeaf:
              request.postpath.insert(0, request.prepath.pop(-1))
              return resrc
          else:
              return resrc.getChildWithDefault(path, request)
  
  
  class _HostResource(resource.Resource):
      def getChild(self, path, request):
          if b":" in path:
              host, port = path.split(b":", 1)
              port = int(port)
          else:
              host, port = path, 80
          request.setHost(host, port)
          prefixLen = 3 + request.isSecure() + 4 + len(path) + len(request.prepath[-3])
          request.path = b"/" + b"/".join(request.postpath)
          request.uri = request.uri[prefixLen:]
          del request.prepath[:3]
          return request.site.getResourceFor(request)
  
  
  class VHostMonsterResource(resource.Resource):
  
      """
      Use this to be able to record the hostname and method (http vs. https)
      in the URL without disturbing your web site. If you put this resource
      in a URL http://foo.com/bar then requests to
      http://foo.com/bar/http/baz.com/something will be equivalent to
      http://foo.com/something, except that the hostname the request will
      appear to be accessing will be "baz.com". So if "baz.com" is redirecting
      all requests for to foo.com, while foo.com is inaccessible from the outside,
      then redirect and url generation will work correctly
      """
  
      def getChild(self, path, request):
          if path == b"http":
              request.isSecure = lambda: 0
          elif path == b"https":
              request.isSecure = lambda: 1
          return _HostResource()
  