source: fedd/fedd.py @ a97394b

#!/usr/local/bin/python

import sys

from BaseHTTPServer import BaseHTTPRequestHandler

from ZSI import Fault, ParseException, FaultFromNotUnderstood, \
    FaultFromZSIException, FaultFromException, ParsedSoap, SoapWriter

from M2Crypto import SSL
from M2Crypto.SSL.SSLServer import SSLServer
import xmlrpclib

from optparse import OptionParser

from fedd_util import fedd_ssl_context, fedid
from fedd_deter_impl import new_feddservice
from service_error import *

from threading import *

# The SSL server here is based on the implementation described at
# http://www.xml.com/pub/a/ws/2004/01/20/salz.html

# Turn off the matching of hostname to certificate ID
SSL.Connection.clientPostConnectionCheck = None

class fedd_server(SSLServer):
    def __init__(self, ME, handler, ssl_ctx, impl):
        SSLServer.__init__(self, ME, handler, ssl_ctx)
        self.impl = impl
        self.soap_methods = impl.get_soap_services()
        self.xmlrpc_methods = impl.get_xmlrpc_services()

class fedd_soap_handler(BaseHTTPRequestHandler):
    server_version = "ZSI/2.0 fedd/0.1 " + BaseHTTPRequestHandler.server_version

    def send_xml(self, text, code=200):
        """Send an XML document as reply"""
        self.send_response(code)
        self.send_header('Content-type', 'text/xml; charset="utf-8"')
        self.send_header('Content-Length', str(len(text)))
        self.end_headers()
        self.wfile.write(text)
        self.wfile.flush()

    def send_fault(self, f, code=500):
        """Send a SOAP encoded fault as reply"""
        self.send_xml(f.AsSOAP(processContents="lax"), code)

    def check_headers(self, ps):
        """Send a fault for any required envelope headers"""
        for (uri, localname) in ps.WhatMustIUnderstand():
            self.send_fault(FaultFromNotUnderstood(uri, lname, 'fedd'))
            return False
        return  True

    def check_method(self, ps):
        """Confirm that this class implements the namespace and SOAP method"""
        root = ps.body_root
        if root.namespaceURI not in self.server.impl.soap_namespaces:
            self.send_fault(Fault(Fault.Client, 
                'Unknown namespace "%s"' % root.namespaceURI))
            return False

        if getattr(root, 'localName', None) == None:
            self.send_fault(Fault(Fault.Client, 'No method"'))
            return False
        return True

    def do_POST(self):
        """Treat an HTTP POST request as a SOAP service call"""
        try:
            cl = int(self.headers['content-length'])
            data = self.rfile.read(cl)
            ps = ParsedSoap(data)
        except ParseException, e:
            self.send_fault(Fault(Fault.Client, str(e)))
            return
        except Exception, e:
            self.send_fault(FaultFromException(e, 0, sys.exc_info()[2]))
            return
        if not self.check_headers(ps): return
        if not self.check_method(ps): return
        try:
            resp = self.soap_dispatch(ps.body_root.localName, ps,
                    fedid(cert=self.request.get_peer_cert()))
        except Fault, f:
            self.send_fault(f)
            resp = None
        
        if resp != None:
            sw = SoapWriter()
            sw.serialize(resp)
            self.send_xml(str(sw))

    def soap_dispatch(self, method, req, fid):
        if self.server.soap_methods.has_key(method):
            try:
                return self.server.soap_methods[method](req, fid)
            except service_error, e:
                de = ns0.faultType_Def(
                        (ns0.faultType_Def.schema,
                            "FeddFaultBody")).pyclass()
                de._code=e.code
                de._errstr=e.code_string()
                de._desc=e.desc
                if  e.is_server_error():
                    raise Fault(Fault.Server, e.code_string(), detail=de)
                else:
                    raise Fault(Fault.Client, e.code_string(), detail=de)
        else:
            raise Fault(Fault.Client, "Unknown method: %s" % method)


class fedd_xmlrpc_handler(BaseHTTPRequestHandler):
    server_version = "ZSI/2.0 fedd/0.1 " + BaseHTTPRequestHandler.server_version

    def send_xml(self, text, code=200):
        """Send an XML document as reply"""
        self.send_response(code)
        self.send_header('Content-type', 'text/xml; charset="utf-8"')
        self.send_header('Content-Length', str(len(text)))
        self.end_headers()
        self.wfile.write(text)
        self.wfile.flush()

    def do_POST(self):
        """Treat an HTTP POST request as an XMLRPC service call"""

        resp = None
        data = None
        method = None
        cl = int(self.headers['content-length'])
        data = self.rfile.read(cl)

        try:
            params, method = xmlrpclib.loads(data)
        except xmlrpclib.ResponseError:
            data = xmlrpclib.dumps(xmlrpclib.Fault("Client", 
                "Malformed request"), methodresponse=True)
        
        if method != None:
            try:
                resp = self.xmlrpc_dispatch(method, params,
                            fedid(cert=self.request.get_peer_cert()))
                data = xmlrpclib.dumps((resp,), encoding='UTF-8', 
                        methodresponse=True)
            except xmlrpclib.Fault, f:
                data = xmlrpclib.dumps(f, methodresponse=True)
                resp = None
        self.send_xml(data)


    def xmlrpc_dispatch(self, method, req, fid):
        if self.server.xmlrpc_methods.has_key(method):
            try:
                return self.server.xmlrpc_methods[method](req, fid)
            except service_error, e:
                raise xmlrpclib.Fault(e.code_string(), e.desc)
        else:
            raise xmlrpclib.Fault(100, "Unknown method: %s" % method)

class fedd_opts(OptionParser):
    """Encapsulate option processing in this class, rather than in main"""
    def __init__(self):
        OptionParser.__init__(self, usage="%prog [opts] (--help for details)",
                version="0.1")

        self.set_defaults(host="localhost", port=23235, transport="soap",
                debug=0)

        self.add_option("-d", "--debug", action="count", dest="debug", 
                help="Set debug.  Repeat for more information")
        self.add_option("-f", "--configfile", action="store",
                dest="configfile", help="Configuration file (required)")
        self.add_option("-H", "--host", action="store", type="string",
                dest="host", help="Hostname to listen on (default %default)")
        self.add_option("-p", "--port", action="store", type="int",
                dest="port", help="Port to listen on (default %default)")
        self.add_option("-s", "--service", action="append", type="string",
                dest="services",
                help="Service description: host:port:transport")
        self.add_option("-x","--transport", action="store", type="choice",
                choices=("xmlrpc", "soap"),
                help="Transport for request (xmlrpc|soap) (Default: %default)")
        self.add_option("--trace", action="store_const", dest="tracefile", 
                const=sys.stderr, help="Print SOAP exchange to stderr")

def run_server(s):
    if s: s.serve_forever()

services = [ ]
servers = [ ]

opts, args = fedd_opts().parse_args()

if opts.configfile != None: 
    try:
        impl = new_feddservice(opts.configfile)
    except RuntimeError, e:
        str = getattr(e, 'desc', None) or getattr(e,'message', None) or \
                "No message"
        sys.exit("Error configuring fedd: %s" % str)
else: 
    sys.exit("--configfile is required")

SOAP_port = (opts.host, opts.port)

if impl.cert_file == None:
    sys.exit("Must supply certificate file (probably in config)")

ctx = None
while ctx == None:
    try:
        ctx = fedd_ssl_context(impl.cert_file, impl.trusted_certs, 
                password=impl.cert_pwd)
    except SSL.SSLError, e:
        if str(e) != "bad decrypt" or impl.cert_pwd != None:
            raise

if opts.services:
    for s in opts.services:
        h, p, t  = s.split(':')

        if not h: h = opts.host
        if not p: p = opts.port
        if not t: h = opts.transport

        p = int(p)

        services.append((t, (h, p)))
else:
    services.append((opts.transport, (opts.host, opts.port)))

for s in services:
    if s[0] == "soap":
        servers.append(fedd_server(s[1], fedd_soap_handler, ctx, impl))
    elif s[0] == "xmlrpc":
        servers.append(fedd_server(s[1], fedd_xmlrpc_handler, ctx, impl))
    else: print >>sys.stderr, "Unknown transport: %s" % s[0]

for s in servers:
    t = Thread(target=run_server, args=(s,))
    t.start()