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authorGeorg Brandl <georg@python.org>2008-05-26 11:14:17 (GMT)
committerGeorg Brandl <georg@python.org>2008-05-26 11:14:17 (GMT)
commit38eceaaf0c207709cfbb44c7a1b9715699622848 (patch)
tree874f496e0fbaf8e6f3c86e86cd0c95fe51845dde /Lib/SimpleXMLRPCServer.py
parent7f986acb0142574d30e5c5460df02fdbb00760e9 (diff)
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Create xmlrpc package. Issue #2886.
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-rw-r--r--Lib/SimpleXMLRPCServer.py593
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diff --git a/Lib/SimpleXMLRPCServer.py b/Lib/SimpleXMLRPCServer.py
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-"""Simple XML-RPC Server.
-
-This module can be used to create simple XML-RPC servers
-by creating a server and either installing functions, a
-class instance, or by extending the SimpleXMLRPCServer
-class.
-
-It can also be used to handle XML-RPC requests in a CGI
-environment using CGIXMLRPCRequestHandler.
-
-A list of possible usage patterns follows:
-
-1. Install functions:
-
-server = SimpleXMLRPCServer(("localhost", 8000))
-server.register_function(pow)
-server.register_function(lambda x,y: x+y, 'add')
-server.serve_forever()
-
-2. Install an instance:
-
-class MyFuncs:
- def __init__(self):
- # make all of the sys functions available through sys.func_name
- import sys
- self.sys = sys
- def _listMethods(self):
- # implement this method so that system.listMethods
- # knows to advertise the sys methods
- return list_public_methods(self) + \
- ['sys.' + method for method in list_public_methods(self.sys)]
- def pow(self, x, y): return pow(x, y)
- def add(self, x, y) : return x + y
-
-server = SimpleXMLRPCServer(("localhost", 8000))
-server.register_introspection_functions()
-server.register_instance(MyFuncs())
-server.serve_forever()
-
-3. Install an instance with custom dispatch method:
-
-class Math:
- def _listMethods(self):
- # this method must be present for system.listMethods
- # to work
- return ['add', 'pow']
- def _methodHelp(self, method):
- # this method must be present for system.methodHelp
- # to work
- if method == 'add':
- return "add(2,3) => 5"
- elif method == 'pow':
- return "pow(x, y[, z]) => number"
- else:
- # By convention, return empty
- # string if no help is available
- return ""
- def _dispatch(self, method, params):
- if method == 'pow':
- return pow(*params)
- elif method == 'add':
- return params[0] + params[1]
- else:
- raise 'bad method'
-
-server = SimpleXMLRPCServer(("localhost", 8000))
-server.register_introspection_functions()
-server.register_instance(Math())
-server.serve_forever()
-
-4. Subclass SimpleXMLRPCServer:
-
-class MathServer(SimpleXMLRPCServer):
- def _dispatch(self, method, params):
- try:
- # We are forcing the 'export_' prefix on methods that are
- # callable through XML-RPC to prevent potential security
- # problems
- func = getattr(self, 'export_' + method)
- except AttributeError:
- raise Exception('method "%s" is not supported' % method)
- else:
- return func(*params)
-
- def export_add(self, x, y):
- return x + y
-
-server = MathServer(("localhost", 8000))
-server.serve_forever()
-
-5. CGI script:
-
-server = CGIXMLRPCRequestHandler()
-server.register_function(pow)
-server.handle_request()
-"""
-
-# Written by Brian Quinlan (brian@sweetapp.com).
-# Based on code written by Fredrik Lundh.
-
-import xmlrpclib
-from xmlrpclib import Fault
-import socketserver
-import BaseHTTPServer
-import sys
-import os
-import traceback
-try:
- import fcntl
-except ImportError:
- fcntl = None
-
-def resolve_dotted_attribute(obj, attr, allow_dotted_names=True):
- """resolve_dotted_attribute(a, 'b.c.d') => a.b.c.d
-
- Resolves a dotted attribute name to an object. Raises
- an AttributeError if any attribute in the chain starts with a '_'.
-
- If the optional allow_dotted_names argument is false, dots are not
- supported and this function operates similar to getattr(obj, attr).
- """
-
- if allow_dotted_names:
- attrs = attr.split('.')
- else:
- attrs = [attr]
-
- for i in attrs:
- if i.startswith('_'):
- raise AttributeError(
- 'attempt to access private attribute "%s"' % i
- )
- else:
- obj = getattr(obj,i)
- return obj
-
-def list_public_methods(obj):
- """Returns a list of attribute strings, found in the specified
- object, which represent callable attributes"""
-
- return [member for member in dir(obj)
- if not member.startswith('_') and
- hasattr(getattr(obj, member), '__call__')]
-
-class SimpleXMLRPCDispatcher:
- """Mix-in class that dispatches XML-RPC requests.
-
- This class is used to register XML-RPC method handlers
- and then to dispatch them. There should never be any
- reason to instantiate this class directly.
- """
-
- def __init__(self, allow_none, encoding):
- self.funcs = {}
- self.instance = None
- self.allow_none = allow_none
- self.encoding = encoding
-
- def register_instance(self, instance, allow_dotted_names=False):
- """Registers an instance to respond to XML-RPC requests.
-
- Only one instance can be installed at a time.
-
- If the registered instance has a _dispatch method then that
- method will be called with the name of the XML-RPC method and
- its parameters as a tuple
- e.g. instance._dispatch('add',(2,3))
-
- If the registered instance does not have a _dispatch method
- then the instance will be searched to find a matching method
- and, if found, will be called. Methods beginning with an '_'
- are considered private and will not be called by
- SimpleXMLRPCServer.
-
- If a registered function matches a XML-RPC request, then it
- will be called instead of the registered instance.
-
- If the optional allow_dotted_names argument is true and the
- instance does not have a _dispatch method, method names
- containing dots are supported and resolved, as long as none of
- the name segments start with an '_'.
-
- *** SECURITY WARNING: ***
-
- Enabling the allow_dotted_names options allows intruders
- to access your module's global variables and may allow
- intruders to execute arbitrary code on your machine. Only
- use this option on a secure, closed network.
-
- """
-
- self.instance = instance
- self.allow_dotted_names = allow_dotted_names
-
- def register_function(self, function, name = None):
- """Registers a function to respond to XML-RPC requests.
-
- The optional name argument can be used to set a Unicode name
- for the function.
- """
-
- if name is None:
- name = function.__name__
- self.funcs[name] = function
-
- def register_introspection_functions(self):
- """Registers the XML-RPC introspection methods in the system
- namespace.
-
- see http://xmlrpc.usefulinc.com/doc/reserved.html
- """
-
- self.funcs.update({'system.listMethods' : self.system_listMethods,
- 'system.methodSignature' : self.system_methodSignature,
- 'system.methodHelp' : self.system_methodHelp})
-
- def register_multicall_functions(self):
- """Registers the XML-RPC multicall method in the system
- namespace.
-
- see http://www.xmlrpc.com/discuss/msgReader$1208"""
-
- self.funcs.update({'system.multicall' : self.system_multicall})
-
- def _marshaled_dispatch(self, data, dispatch_method = None):
- """Dispatches an XML-RPC method from marshalled (XML) data.
-
- XML-RPC methods are dispatched from the marshalled (XML) data
- using the _dispatch method and the result is returned as
- marshalled data. For backwards compatibility, a dispatch
- function can be provided as an argument (see comment in
- SimpleXMLRPCRequestHandler.do_POST) but overriding the
- existing method through subclassing is the prefered means
- of changing method dispatch behavior.
- """
-
- try:
- params, method = xmlrpclib.loads(data)
-
- # generate response
- if dispatch_method is not None:
- response = dispatch_method(method, params)
- else:
- response = self._dispatch(method, params)
- # wrap response in a singleton tuple
- response = (response,)
- response = xmlrpclib.dumps(response, methodresponse=1,
- allow_none=self.allow_none, encoding=self.encoding)
- except Fault as fault:
- response = xmlrpclib.dumps(fault, allow_none=self.allow_none,
- encoding=self.encoding)
- except:
- # report exception back to server
- exc_type, exc_value, exc_tb = sys.exc_info()
- response = xmlrpclib.dumps(
- xmlrpclib.Fault(1, "%s:%s" % (exc_type, exc_value)),
- encoding=self.encoding, allow_none=self.allow_none,
- )
-
- return response
-
- def system_listMethods(self):
- """system.listMethods() => ['add', 'subtract', 'multiple']
-
- Returns a list of the methods supported by the server."""
-
- methods = set(self.funcs.keys())
- if self.instance is not None:
- # Instance can implement _listMethod to return a list of
- # methods
- if hasattr(self.instance, '_listMethods'):
- methods |= set(self.instance._listMethods())
- # if the instance has a _dispatch method then we
- # don't have enough information to provide a list
- # of methods
- elif not hasattr(self.instance, '_dispatch'):
- methods |= set(list_public_methods(self.instance))
- return sorted(methods)
-
- def system_methodSignature(self, method_name):
- """system.methodSignature('add') => [double, int, int]
-
- Returns a list describing the signature of the method. In the
- above example, the add method takes two integers as arguments
- and returns a double result.
-
- This server does NOT support system.methodSignature."""
-
- # See http://xmlrpc.usefulinc.com/doc/sysmethodsig.html
-
- return 'signatures not supported'
-
- def system_methodHelp(self, method_name):
- """system.methodHelp('add') => "Adds two integers together"
-
- Returns a string containing documentation for the specified method."""
-
- method = None
- if method_name in self.funcs:
- method = self.funcs[method_name]
- elif self.instance is not None:
- # Instance can implement _methodHelp to return help for a method
- if hasattr(self.instance, '_methodHelp'):
- return self.instance._methodHelp(method_name)
- # if the instance has a _dispatch method then we
- # don't have enough information to provide help
- elif not hasattr(self.instance, '_dispatch'):
- try:
- method = resolve_dotted_attribute(
- self.instance,
- method_name,
- self.allow_dotted_names
- )
- except AttributeError:
- pass
-
- # Note that we aren't checking that the method actually
- # be a callable object of some kind
- if method is None:
- return ""
- else:
- import pydoc
- return pydoc.getdoc(method)
-
- def system_multicall(self, call_list):
- """system.multicall([{'methodName': 'add', 'params': [2, 2]}, ...]) => \
-[[4], ...]
-
- Allows the caller to package multiple XML-RPC calls into a single
- request.
-
- See http://www.xmlrpc.com/discuss/msgReader$1208
- """
-
- results = []
- for call in call_list:
- method_name = call['methodName']
- params = call['params']
-
- try:
- # XXX A marshalling error in any response will fail the entire
- # multicall. If someone cares they should fix this.
- results.append([self._dispatch(method_name, params)])
- except Fault as fault:
- results.append(
- {'faultCode' : fault.faultCode,
- 'faultString' : fault.faultString}
- )
- except:
- exc_type, exc_value, exc_tb = sys.exc_info()
- results.append(
- {'faultCode' : 1,
- 'faultString' : "%s:%s" % (exc_type, exc_value)}
- )
- return results
-
- def _dispatch(self, method, params):
- """Dispatches the XML-RPC method.
-
- XML-RPC calls are forwarded to a registered function that
- matches the called XML-RPC method name. If no such function
- exists then the call is forwarded to the registered instance,
- if available.
-
- If the registered instance has a _dispatch method then that
- method will be called with the name of the XML-RPC method and
- its parameters as a tuple
- e.g. instance._dispatch('add',(2,3))
-
- If the registered instance does not have a _dispatch method
- then the instance will be searched to find a matching method
- and, if found, will be called.
-
- Methods beginning with an '_' are considered private and will
- not be called.
- """
-
- func = None
- try:
- # check to see if a matching function has been registered
- func = self.funcs[method]
- except KeyError:
- if self.instance is not None:
- # check for a _dispatch method
- if hasattr(self.instance, '_dispatch'):
- return self.instance._dispatch(method, params)
- else:
- # call instance method directly
- try:
- func = resolve_dotted_attribute(
- self.instance,
- method,
- self.allow_dotted_names
- )
- except AttributeError:
- pass
-
- if func is not None:
- return func(*params)
- else:
- raise Exception('method "%s" is not supported' % method)
-
-class SimpleXMLRPCRequestHandler(BaseHTTPServer.BaseHTTPRequestHandler):
- """Simple XML-RPC request handler class.
-
- Handles all HTTP POST requests and attempts to decode them as
- XML-RPC requests.
- """
-
- # Class attribute listing the accessible path components;
- # paths not on this list will result in a 404 error.
- rpc_paths = ('/', '/RPC2')
-
- def is_rpc_path_valid(self):
- if self.rpc_paths:
- return self.path in self.rpc_paths
- else:
- # If .rpc_paths is empty, just assume all paths are legal
- return True
-
- def do_POST(self):
- """Handles the HTTP POST request.
-
- Attempts to interpret all HTTP POST requests as XML-RPC calls,
- which are forwarded to the server's _dispatch method for handling.
- """
-
- # Check that the path is legal
- if not self.is_rpc_path_valid():
- self.report_404()
- return
-
- try:
- # Get arguments by reading body of request.
- # We read this in chunks to avoid straining
- # socket.read(); around the 10 or 15Mb mark, some platforms
- # begin to have problems (bug #792570).
- max_chunk_size = 10*1024*1024
- size_remaining = int(self.headers["content-length"])
- L = []
- while size_remaining:
- chunk_size = min(size_remaining, max_chunk_size)
- L.append(self.rfile.read(chunk_size))
- size_remaining -= len(L[-1])
- data = b''.join(L)
-
- # In previous versions of SimpleXMLRPCServer, _dispatch
- # could be overridden in this class, instead of in
- # SimpleXMLRPCDispatcher. To maintain backwards compatibility,
- # check to see if a subclass implements _dispatch and dispatch
- # using that method if present.
- response = self.server._marshaled_dispatch(
- data, getattr(self, '_dispatch', None)
- )
- except Exception as e: # This should only happen if the module is buggy
- # internal error, report as HTTP server error
- self.send_response(500)
-
- # Send information about the exception if requested
- if hasattr(self.server, '_send_traceback_header') and \
- self.server._send_traceback_header:
- self.send_header("X-exception", str(e))
- self.send_header("X-traceback", traceback.format_exc())
-
- self.end_headers()
- else:
- # Got a valid XML RPC response; convert to bytes first
- response = response.encode("utf-8")
- self.send_response(200)
- self.send_header("Content-type", "text/xml")
- self.send_header("Content-length", str(len(response)))
- self.end_headers()
- self.wfile.write(response)
-
- # shut down the connection
- self.wfile.flush()
- self.connection.shutdown(1)
-
- def report_404 (self):
- # Report a 404 error
- self.send_response(404)
- response = b'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)
- # shut down the connection
- self.wfile.flush()
- self.connection.shutdown(1)
-
- 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 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: text/html')
- 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
- if request_text is None:
- request_text = sys.stdin.read()
-
- 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.serve_forever()