# -*- test-case-name: txweb2.test -*- ## # Copyright (c) 2001-2008 Twisted Matrix Laboratories. # Copyright (c) 2010-2017 Apple Inc. All rights reserved. # # Permission is hereby granted, free of charge, to any person obtaining a copy # of this software and associated documentation files (the "Software"), to deal # in the Software without restriction, including without limitation the rights # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell # copies of the Software, and to permit persons to whom the Software is # furnished to do so, subject to the following conditions: # # The above copyright notice and this permission notice shall be included in all # copies or substantial portions of the Software. # # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE # SOFTWARE. # ## """ I contain the interfaces for several web related objects including IRequest and IResource. I am based heavily on ideas from C{nevow.inevow}. """ from zope.interface import Attribute, Interface, interface # server.py interfaces class IResource(Interface): """ An HTTP resource. I serve 2 main purposes: one is to provide a standard representation for what HTTP specification calls an 'entity', and the other is to provide an mechanism for mapping URLs to content. """ def locateChild(req, segments): """ Locate another object which can be adapted to IResource. @return: A 2-tuple of (resource, remaining-path-segments), or a deferred which will fire the above. Causes the object publishing machinery to continue on with specified resource and segments, calling the appropriate method on the specified resource. If you return (self, L{server.StopTraversal}), this instructs web2 to immediately stop the lookup stage, and switch to the rendering stage, leaving the remaining path alone for your render function to handle. """ def renderHTTP(req): """ Return an IResponse or a deferred which will fire an IResponse. This response will be written to the web browser which initiated the request. """ # Is there a better way to do this than this funky extra class? _default = object() class SpecialAdaptInterfaceClass(interface.InterfaceClass): # A special adapter for IResource to handle the extra step of adapting # from IOldNevowResource-providing resources. def __call__(self, other, alternate=_default): result = super(SpecialAdaptInterfaceClass, self).__call__(other, alternate) if result is not alternate: return result result = IOldNevowResource(other, alternate) if result is not alternate: result = IResource(result) return result if alternate is not _default: return alternate raise TypeError('Could not adapt', other, self) IResource.__class__ = SpecialAdaptInterfaceClass class IOldNevowResource(Interface): # Shared interface with inevow.IResource """ I am a web resource. """ def locateChild(ctx, segments): """ Locate another object which can be adapted to IResource Return a tuple of resource, path segments """ def renderHTTP(ctx): """ Return a string or a deferred which will fire a string. This string will be written to the web browser which initiated this request. Unlike iweb.IResource, this expects the incoming data to have already been read and parsed into request.args and request.content, and expects to return a string instead of a response object. """ class ICanHandleException(Interface): # Shared interface with inevow.ICanHandleException def renderHTTP_exception(request, failure): """ Render an exception to the given request object. """ def renderInlineException(request, reason): """ Return stan representing the exception, to be printed in the page, not replacing the page.""" # http.py interfaces class IResponse(Interface): """ I'm a response. """ code = Attribute("The HTTP response code") headers = Attribute("A http_headers.Headers instance of headers to send") stream = Attribute("A stream.IByteStream of outgoing data, or else None.") class IRequest(Interface): """ I'm a request for a web resource. """ method = Attribute("The HTTP method from the request line, e.g. GET") uri = Attribute("The raw URI from the request line. May or may not include host.") clientproto = Attribute("Protocol from the request line, e.g. HTTP/1.1") headers = Attribute("A http_headers.Headers instance of incoming headers.") stream = Attribute("A stream.IByteStream of incoming data.") def writeResponse(response): """ Write an IResponse object to the client. """ chanRequest = Attribute("The ChannelRequest. I wonder if this is public really?") from twisted.web.iweb import IRequest as IOldRequest # @UnusedImport class IChanRequestCallbacks(Interface): """ The bits that are required of a Request for interfacing with a IChanRequest object """ def __init__(chanRequest, command, path, version, contentLength, inHeaders): """ Create a new Request object. @param chanRequest: the IChanRequest object creating this request @param command: the HTTP command e.g. GET @param path: the HTTP path e.g. /foo/bar.html @param version: the parsed HTTP version e.g. (1,1) @param contentLength: how much data to expect, or None if unknown @param inHeaders: the request headers""" def process(): """ Process the request. Called as soon as it's possibly reasonable to return a response. L{handleContentComplete} may or may not have been called already. """ def handleContentChunk(data): """ Called when a piece of incoming data has been received. """ def handleContentComplete(): """ Called when the incoming data stream is finished. """ def connectionLost(reason): """ Called if the connection was lost. """ class IChanRequest(Interface): def writeIntermediateResponse(code, headers=None): """ Write a non-terminating response. Intermediate responses cannot contain data. If the channel does not support intermediate responses, do nothing. @param code: The response code. Should be in the 1xx range. @type code: int @param headers: the headers to send in the response @type headers: C{twisted.web.http_headers.Headers} """ def writeHeaders(code, headers): """ Write a final response. @param code: The response code. Should not be in the 1xx range. @type code: int @param headers: the headers to send in the response. They will be augmented with any connection-oriented headers as necessary for the protocol. @type headers: C{twisted.web.http_headers.Headers} """ def write(data): """ Write some data. @param data: the data bytes @type data: str """ def finish(): """ Finish the request, and clean up the connection if necessary. """ def abortConnection(): """ Forcibly abort the connection without cleanly closing. Use if, for example, you can't write all the data you promised. """ def registerProducer(producer, streaming): """ Register a producer with the standard API. """ def unregisterProducer(): """ Unregister a producer. """ def getHostInfo(): """ Returns a tuple of (address, socket user connected to, boolean, was it secure). Note that this should not necessarily always return the actual local socket information from twisted. E.g. in a CGI, it should use the variables coming from the invoking script. """ def getRemoteHost(): """ Returns an address of the remote host. Like L{getHostInfo}, this information may come from the real socket, or may come from additional information, depending on the transport. """ persistent = Attribute("""Whether this request supports HTTP connection persistence. May be set to False. Should not be set to other values.""") class ISite(Interface): pass __all__ = ['ICanHandleException', 'IChanRequest', 'IChanRequestCallbacks', 'IOldNevowResource', 'IOldRequest', 'IRequest', 'IResource', 'IResponse', 'ISite']