708 lines
25 KiB
Python
708 lines
25 KiB
Python
r"""Simple XML-RPC Server.
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This module can be used to create simple XML-RPC servers
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by creating a server and either installing functions, a
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class instance, or by extending the SimpleXMLRPCServer
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class.
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It can also be used to handle XML-RPC requests in a CGI
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environment using CGIXMLRPCRequestHandler.
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A list of possible usage patterns follows:
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1. Install functions:
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server = SimpleXMLRPCServer(("localhost", 8000))
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server.register_function(pow)
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server.register_function(lambda x,y: x+y, 'add')
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server.serve_forever()
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2. Install an instance:
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class MyFuncs:
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def __init__(self):
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# make all of the string functions available through
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# string.func_name
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import string
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self.string = string
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def _listMethods(self):
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# implement this method so that system.listMethods
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# knows to advertise the strings methods
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return list_public_methods(self) + \
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['string.' + method for method in list_public_methods(self.string)]
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def pow(self, x, y): return pow(x, y)
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def add(self, x, y) : return x + y
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server = SimpleXMLRPCServer(("localhost", 8000))
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server.register_introspection_functions()
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server.register_instance(MyFuncs())
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server.serve_forever()
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3. Install an instance with custom dispatch method:
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class Math:
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def _listMethods(self):
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# this method must be present for system.listMethods
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# to work
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return ['add', 'pow']
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def _methodHelp(self, method):
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# this method must be present for system.methodHelp
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# to work
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if method == 'add':
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return "add(2,3) => 5"
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elif method == 'pow':
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return "pow(x, y[, z]) => number"
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else:
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# By convention, return empty
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# string if no help is available
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return ""
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def _dispatch(self, method, params):
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if method == 'pow':
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return pow(*params)
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elif method == 'add':
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return params[0] + params[1]
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else:
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raise 'bad method'
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server = SimpleXMLRPCServer(("localhost", 8000))
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server.register_introspection_functions()
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server.register_instance(Math())
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server.serve_forever()
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4. Subclass SimpleXMLRPCServer:
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class MathServer(SimpleXMLRPCServer):
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def _dispatch(self, method, params):
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try:
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# We are forcing the 'export_' prefix on methods that are
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# callable through XML-RPC to prevent potential security
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# problems
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func = getattr(self, 'export_' + method)
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except AttributeError:
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raise Exception('method "%s" is not supported' % method)
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else:
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return func(*params)
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def export_add(self, x, y):
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return x + y
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server = MathServer(("localhost", 8000))
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server.serve_forever()
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5. CGI script:
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server = CGIXMLRPCRequestHandler()
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server.register_function(pow)
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server.handle_request()
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"""
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# Written by Brian Quinlan (brian@sweetapp.com).
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# Based on code written by Fredrik Lundh.
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import xmlrpclib
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from xmlrpclib import Fault
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import SocketServer
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import BaseHTTPServer
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import sys
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import os
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import traceback
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import re
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try:
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import fcntl
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except ImportError:
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fcntl = None
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def resolve_dotted_attribute(obj, attr, allow_dotted_names=True):
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"""resolve_dotted_attribute(a, 'b.c.d') => a.b.c.d
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Resolves a dotted attribute name to an object. Raises
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an AttributeError if any attribute in the chain starts with a '_'.
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If the optional allow_dotted_names argument is false, dots are not
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supported and this function operates similar to getattr(obj, attr).
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"""
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if allow_dotted_names:
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attrs = attr.split('.')
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else:
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attrs = [attr]
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for i in attrs:
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if i.startswith('_'):
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raise AttributeError(
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'attempt to access private attribute "%s"' % i
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)
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else:
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obj = getattr(obj,i)
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return obj
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def list_public_methods(obj):
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"""Returns a list of attribute strings, found in the specified
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object, which represent callable attributes"""
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return [member for member in dir(obj)
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if not member.startswith('_') and
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hasattr(getattr(obj, member), '__call__')]
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def remove_duplicates(lst):
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"""remove_duplicates([2,2,2,1,3,3]) => [3,1,2]
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Returns a copy of a list without duplicates. Every list
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item must be hashable and the order of the items in the
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resulting list is not defined.
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"""
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u = {}
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for x in lst:
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u[x] = 1
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return u.keys()
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class SimpleXMLRPCDispatcher:
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"""Mix-in class that dispatches XML-RPC requests.
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This class is used to register XML-RPC method handlers
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and then to dispatch them. This class doesn't need to be
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instanced directly when used by SimpleXMLRPCServer but it
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can be instanced when used by the MultiPathXMLRPCServer.
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"""
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def __init__(self, allow_none=False, encoding=None):
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self.funcs = {}
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self.instance = None
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self.allow_none = allow_none
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self.encoding = encoding
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def register_instance(self, instance, allow_dotted_names=False):
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"""Registers an instance to respond to XML-RPC requests.
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Only one instance can be installed at a time.
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If the registered instance has a _dispatch method then that
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method will be called with the name of the XML-RPC method and
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its parameters as a tuple
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e.g. instance._dispatch('add',(2,3))
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If the registered instance does not have a _dispatch method
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then the instance will be searched to find a matching method
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and, if found, will be called. Methods beginning with an '_'
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are considered private and will not be called by
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SimpleXMLRPCServer.
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If a registered function matches a XML-RPC request, then it
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will be called instead of the registered instance.
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If the optional allow_dotted_names argument is true and the
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instance does not have a _dispatch method, method names
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containing dots are supported and resolved, as long as none of
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the name segments start with an '_'.
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*** SECURITY WARNING: ***
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Enabling the allow_dotted_names options allows intruders
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to access your module's global variables and may allow
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intruders to execute arbitrary code on your machine. Only
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use this option on a secure, closed network.
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"""
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self.instance = instance
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self.allow_dotted_names = allow_dotted_names
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def register_function(self, function, name = None):
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"""Registers a function to respond to XML-RPC requests.
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The optional name argument can be used to set a Unicode name
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for the function.
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"""
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if name is None:
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name = function.__name__
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self.funcs[name] = function
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def register_introspection_functions(self):
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"""Registers the XML-RPC introspection methods in the system
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namespace.
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see http://xmlrpc.usefulinc.com/doc/reserved.html
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"""
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self.funcs.update({'system.listMethods' : self.system_listMethods,
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'system.methodSignature' : self.system_methodSignature,
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'system.methodHelp' : self.system_methodHelp})
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def register_multicall_functions(self):
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"""Registers the XML-RPC multicall method in the system
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namespace.
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see http://www.xmlrpc.com/discuss/msgReader$1208"""
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self.funcs.update({'system.multicall' : self.system_multicall})
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def _marshaled_dispatch(self, data, dispatch_method = None, path = None):
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"""Dispatches an XML-RPC method from marshalled (XML) data.
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XML-RPC methods are dispatched from the marshalled (XML) data
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using the _dispatch method and the result is returned as
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marshalled data. For backwards compatibility, a dispatch
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function can be provided as an argument (see comment in
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SimpleXMLRPCRequestHandler.do_POST) but overriding the
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existing method through subclassing is the preferred means
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of changing method dispatch behavior.
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"""
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try:
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params, method = xmlrpclib.loads(data)
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# generate response
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if dispatch_method is not None:
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response = dispatch_method(method, params)
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else:
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response = self._dispatch(method, params)
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# wrap response in a singleton tuple
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response = (response,)
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response = xmlrpclib.dumps(response, methodresponse=1,
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allow_none=self.allow_none, encoding=self.encoding)
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except Fault, fault:
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response = xmlrpclib.dumps(fault, allow_none=self.allow_none,
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encoding=self.encoding)
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except:
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# report exception back to server
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exc_type, exc_value, exc_tb = sys.exc_info()
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response = xmlrpclib.dumps(
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xmlrpclib.Fault(1, "%s:%s" % (exc_type, exc_value)),
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encoding=self.encoding, allow_none=self.allow_none,
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)
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return response
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def system_listMethods(self):
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"""system.listMethods() => ['add', 'subtract', 'multiple']
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Returns a list of the methods supported by the server."""
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methods = self.funcs.keys()
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if self.instance is not None:
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# Instance can implement _listMethod to return a list of
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# methods
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if hasattr(self.instance, '_listMethods'):
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methods = remove_duplicates(
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methods + self.instance._listMethods()
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)
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# if the instance has a _dispatch method then we
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# don't have enough information to provide a list
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# of methods
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elif not hasattr(self.instance, '_dispatch'):
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methods = remove_duplicates(
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methods + list_public_methods(self.instance)
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)
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methods.sort()
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return methods
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def system_methodSignature(self, method_name):
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"""system.methodSignature('add') => [double, int, int]
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Returns a list describing the signature of the method. In the
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above example, the add method takes two integers as arguments
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and returns a double result.
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This server does NOT support system.methodSignature."""
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# See http://xmlrpc.usefulinc.com/doc/sysmethodsig.html
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return 'signatures not supported'
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def system_methodHelp(self, method_name):
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"""system.methodHelp('add') => "Adds two integers together"
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Returns a string containing documentation for the specified method."""
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method = None
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if method_name in self.funcs:
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method = self.funcs[method_name]
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elif self.instance is not None:
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# Instance can implement _methodHelp to return help for a method
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if hasattr(self.instance, '_methodHelp'):
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return self.instance._methodHelp(method_name)
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# if the instance has a _dispatch method then we
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# don't have enough information to provide help
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elif not hasattr(self.instance, '_dispatch'):
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try:
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method = resolve_dotted_attribute(
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self.instance,
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method_name,
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self.allow_dotted_names
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)
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except AttributeError:
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pass
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# Note that we aren't checking that the method actually
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# be a callable object of some kind
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if method is None:
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return ""
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else:
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import pydoc
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return pydoc.getdoc(method)
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def system_multicall(self, call_list):
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"""system.multicall([{'methodName': 'add', 'params': [2, 2]}, ...]) => \
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[[4], ...]
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Allows the caller to package multiple XML-RPC calls into a single
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request.
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See http://www.xmlrpc.com/discuss/msgReader$1208
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"""
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results = []
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for call in call_list:
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method_name = call['methodName']
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params = call['params']
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try:
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# XXX A marshalling error in any response will fail the entire
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# multicall. If someone cares they should fix this.
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results.append([self._dispatch(method_name, params)])
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except Fault, fault:
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results.append(
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{'faultCode' : fault.faultCode,
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'faultString' : fault.faultString}
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)
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except:
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exc_type, exc_value, exc_tb = sys.exc_info()
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results.append(
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{'faultCode' : 1,
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'faultString' : "%s:%s" % (exc_type, exc_value)}
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)
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return results
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def _dispatch(self, method, params):
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"""Dispatches the XML-RPC method.
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XML-RPC calls are forwarded to a registered function that
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matches the called XML-RPC method name. If no such function
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exists then the call is forwarded to the registered instance,
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if available.
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If the registered instance has a _dispatch method then that
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method will be called with the name of the XML-RPC method and
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its parameters as a tuple
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e.g. instance._dispatch('add',(2,3))
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If the registered instance does not have a _dispatch method
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then the instance will be searched to find a matching method
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and, if found, will be called.
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Methods beginning with an '_' are considered private and will
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not be called.
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"""
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func = None
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try:
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# check to see if a matching function has been registered
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func = self.funcs[method]
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except KeyError:
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if self.instance is not None:
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# check for a _dispatch method
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if hasattr(self.instance, '_dispatch'):
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return self.instance._dispatch(method, params)
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else:
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# call instance method directly
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try:
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func = resolve_dotted_attribute(
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self.instance,
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method,
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self.allow_dotted_names
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)
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except AttributeError:
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pass
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if func is not None:
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return func(*params)
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else:
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raise Exception('method "%s" is not supported' % method)
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class SimpleXMLRPCRequestHandler(BaseHTTPServer.BaseHTTPRequestHandler):
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"""Simple XML-RPC request handler class.
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Handles all HTTP POST requests and attempts to decode them as
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XML-RPC requests.
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"""
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# Class attribute listing the accessible path components;
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# paths not on this list will result in a 404 error.
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rpc_paths = ('/', '/RPC2')
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#if not None, encode responses larger than this, if possible
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encode_threshold = 1400 #a common MTU
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#Override form StreamRequestHandler: full buffering of output
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#and no Nagle.
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wbufsize = -1
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disable_nagle_algorithm = True
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# a re to match a gzip Accept-Encoding
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aepattern = re.compile(r"""
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\s* ([^\s;]+) \s* #content-coding
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(;\s* q \s*=\s* ([0-9\.]+))? #q
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""", re.VERBOSE | re.IGNORECASE)
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def accept_encodings(self):
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r = {}
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ae = self.headers.get("Accept-Encoding", "")
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for e in ae.split(","):
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match = self.aepattern.match(e)
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if match:
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v = match.group(3)
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v = float(v) if v else 1.0
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r[match.group(1)] = v
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return r
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def is_rpc_path_valid(self):
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if self.rpc_paths:
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return self.path in self.rpc_paths
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else:
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# If .rpc_paths is empty, just assume all paths are legal
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return True
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def do_POST(self):
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"""Handles the HTTP POST request.
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Attempts to interpret all HTTP POST requests as XML-RPC calls,
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which are forwarded to the server's _dispatch method for handling.
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"""
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# Check that the path is legal
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if not self.is_rpc_path_valid():
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self.report_404()
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return
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try:
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# Get arguments by reading body of request.
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# We read this in chunks to avoid straining
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# socket.read(); around the 10 or 15Mb mark, some platforms
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# begin to have problems (bug #792570).
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max_chunk_size = 10*1024*1024
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size_remaining = int(self.headers["content-length"])
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L = []
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while size_remaining:
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chunk_size = min(size_remaining, max_chunk_size)
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chunk = self.rfile.read(chunk_size)
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if not chunk:
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break
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L.append(chunk)
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size_remaining -= len(L[-1])
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data = ''.join(L)
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data = self.decode_request_content(data)
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if data is None:
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return #response has been sent
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# In previous versions of SimpleXMLRPCServer, _dispatch
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# could be overridden in this class, instead of in
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# SimpleXMLRPCDispatcher. To maintain backwards compatibility,
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# check to see if a subclass implements _dispatch and dispatch
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# using that method if present.
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response = self.server._marshaled_dispatch(
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data, getattr(self, '_dispatch', None), self.path
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)
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except Exception, e: # This should only happen if the module is buggy
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# internal error, report as HTTP server error
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self.send_response(500)
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# Send information about the exception if requested
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if hasattr(self.server, '_send_traceback_header') and \
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self.server._send_traceback_header:
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self.send_header("X-exception", str(e))
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self.send_header("X-traceback", traceback.format_exc())
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self.send_header("Content-length", "0")
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self.end_headers()
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else:
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# got a valid XML RPC response
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self.send_response(200)
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self.send_header("Content-type", "text/xml")
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if self.encode_threshold is not None:
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if len(response) > self.encode_threshold:
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q = self.accept_encodings().get("gzip", 0)
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if q:
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try:
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response = xmlrpclib.gzip_encode(response)
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self.send_header("Content-Encoding", "gzip")
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except NotImplementedError:
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pass
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self.send_header("Content-length", str(len(response)))
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self.end_headers()
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self.wfile.write(response)
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def decode_request_content(self, data):
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#support gzip encoding of request
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encoding = self.headers.get("content-encoding", "identity").lower()
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if encoding == "identity":
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return data
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if encoding == "gzip":
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try:
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return xmlrpclib.gzip_decode(data)
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except NotImplementedError:
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self.send_response(501, "encoding %r not supported" % encoding)
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except ValueError:
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self.send_response(400, "error decoding gzip content")
|
|
else:
|
|
self.send_response(501, "encoding %r not supported" % encoding)
|
|
self.send_header("Content-length", "0")
|
|
self.end_headers()
|
|
|
|
def report_404 (self):
|
|
# Report a 404 error
|
|
self.send_response(404)
|
|
response = 'No such page'
|
|
self.send_header("Content-type", "text/plain")
|
|
self.send_header("Content-length", str(len(response)))
|
|
self.end_headers()
|
|
self.wfile.write(response)
|
|
|
|
def log_request(self, code='-', size='-'):
|
|
"""Selectively log an accepted request."""
|
|
|
|
if self.server.logRequests:
|
|
BaseHTTPServer.BaseHTTPRequestHandler.log_request(self, code, size)
|
|
|
|
class SimpleXMLRPCServer(SocketServer.TCPServer,
|
|
SimpleXMLRPCDispatcher):
|
|
"""Simple XML-RPC server.
|
|
|
|
Simple XML-RPC server that allows functions and a single instance
|
|
to be installed to handle requests. The default implementation
|
|
attempts to dispatch XML-RPC calls to the functions or instance
|
|
installed in the server. Override the _dispatch method inhereted
|
|
from SimpleXMLRPCDispatcher to change this behavior.
|
|
"""
|
|
|
|
allow_reuse_address = True
|
|
|
|
# Warning: this is for debugging purposes only! Never set this to True in
|
|
# production code, as will be sending out sensitive information (exception
|
|
# and stack trace details) when exceptions are raised inside
|
|
# SimpleXMLRPCRequestHandler.do_POST
|
|
_send_traceback_header = False
|
|
|
|
def __init__(self, addr, requestHandler=SimpleXMLRPCRequestHandler,
|
|
logRequests=True, allow_none=False, encoding=None, bind_and_activate=True):
|
|
self.logRequests = logRequests
|
|
|
|
SimpleXMLRPCDispatcher.__init__(self, allow_none, encoding)
|
|
SocketServer.TCPServer.__init__(self, addr, requestHandler, bind_and_activate)
|
|
|
|
# [Bug #1222790] If possible, set close-on-exec flag; if a
|
|
# method spawns a subprocess, the subprocess shouldn't have
|
|
# the listening socket open.
|
|
if fcntl is not None and hasattr(fcntl, 'FD_CLOEXEC'):
|
|
flags = fcntl.fcntl(self.fileno(), fcntl.F_GETFD)
|
|
flags |= fcntl.FD_CLOEXEC
|
|
fcntl.fcntl(self.fileno(), fcntl.F_SETFD, flags)
|
|
|
|
class MultiPathXMLRPCServer(SimpleXMLRPCServer):
|
|
"""Multipath XML-RPC Server
|
|
This specialization of SimpleXMLRPCServer allows the user to create
|
|
multiple Dispatcher instances and assign them to different
|
|
HTTP request paths. This makes it possible to run two or more
|
|
'virtual XML-RPC servers' at the same port.
|
|
Make sure that the requestHandler accepts the paths in question.
|
|
"""
|
|
def __init__(self, addr, requestHandler=SimpleXMLRPCRequestHandler,
|
|
logRequests=True, allow_none=False, encoding=None, bind_and_activate=True):
|
|
|
|
SimpleXMLRPCServer.__init__(self, addr, requestHandler, logRequests, allow_none,
|
|
encoding, bind_and_activate)
|
|
self.dispatchers = {}
|
|
self.allow_none = allow_none
|
|
self.encoding = encoding
|
|
|
|
def add_dispatcher(self, path, dispatcher):
|
|
self.dispatchers[path] = dispatcher
|
|
return dispatcher
|
|
|
|
def get_dispatcher(self, path):
|
|
return self.dispatchers[path]
|
|
|
|
def _marshaled_dispatch(self, data, dispatch_method = None, path = None):
|
|
try:
|
|
response = self.dispatchers[path]._marshaled_dispatch(
|
|
data, dispatch_method, path)
|
|
except:
|
|
# report low level exception back to server
|
|
# (each dispatcher should have handled their own
|
|
# exceptions)
|
|
exc_type, exc_value = sys.exc_info()[:2]
|
|
response = xmlrpclib.dumps(
|
|
xmlrpclib.Fault(1, "%s:%s" % (exc_type, exc_value)),
|
|
encoding=self.encoding, allow_none=self.allow_none)
|
|
return response
|
|
|
|
class CGIXMLRPCRequestHandler(SimpleXMLRPCDispatcher):
|
|
"""Simple handler for XML-RPC data passed through CGI."""
|
|
|
|
def __init__(self, allow_none=False, encoding=None):
|
|
SimpleXMLRPCDispatcher.__init__(self, allow_none, encoding)
|
|
|
|
def handle_xmlrpc(self, request_text):
|
|
"""Handle a single XML-RPC request"""
|
|
|
|
response = self._marshaled_dispatch(request_text)
|
|
|
|
print 'Content-Type: text/xml'
|
|
print 'Content-Length: %d' % len(response)
|
|
print
|
|
sys.stdout.write(response)
|
|
|
|
def handle_get(self):
|
|
"""Handle a single HTTP GET request.
|
|
|
|
Default implementation indicates an error because
|
|
XML-RPC uses the POST method.
|
|
"""
|
|
|
|
code = 400
|
|
message, explain = \
|
|
BaseHTTPServer.BaseHTTPRequestHandler.responses[code]
|
|
|
|
response = BaseHTTPServer.DEFAULT_ERROR_MESSAGE % \
|
|
{
|
|
'code' : code,
|
|
'message' : message,
|
|
'explain' : explain
|
|
}
|
|
print 'Status: %d %s' % (code, message)
|
|
print 'Content-Type: %s' % BaseHTTPServer.DEFAULT_ERROR_CONTENT_TYPE
|
|
print 'Content-Length: %d' % len(response)
|
|
print
|
|
sys.stdout.write(response)
|
|
|
|
def handle_request(self, request_text = None):
|
|
"""Handle a single XML-RPC request passed through a CGI post method.
|
|
|
|
If no XML data is given then it is read from stdin. The resulting
|
|
XML-RPC response is printed to stdout along with the correct HTTP
|
|
headers.
|
|
"""
|
|
|
|
if request_text is None and \
|
|
os.environ.get('REQUEST_METHOD', None) == 'GET':
|
|
self.handle_get()
|
|
else:
|
|
# POST data is normally available through stdin
|
|
try:
|
|
length = int(os.environ.get('CONTENT_LENGTH', None))
|
|
except (TypeError, ValueError):
|
|
length = -1
|
|
if request_text is None:
|
|
request_text = sys.stdin.read(length)
|
|
|
|
self.handle_xmlrpc(request_text)
|
|
|
|
if __name__ == '__main__':
|
|
print 'Running XML-RPC server on port 8000'
|
|
server = SimpleXMLRPCServer(("localhost", 8000))
|
|
server.register_function(pow)
|
|
server.register_function(lambda x,y: x+y, 'add')
|
|
server.register_multicall_functions()
|
|
server.serve_forever()
|