server.py 17.3 KB
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#!/usr/bin/python
# -*- coding: latin-1 -*-
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published by the
# Free Software Foundation; either version 3, or (at your option) any later
# version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTIBILITY
# or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
# for more details.

"Simple SOAP Server implementation"

__author__ = "Mariano Reingart (reingart@gmail.com)"
__copyright__ = "Copyright (C) 2010 Mariano Reingart"
__license__ = "LGPL 3.0"
__version__ = "1.02c"

from simplexml import SimpleXMLElement, TYPE_MAP, DateTime, Date, Decimal

DEBUG = False


class SoapDispatcher(object):
    "Simple Dispatcher for SOAP Server"
    
    def __init__(self, name, documentation='', action='', location='', 
                 namespace=None, prefix=False, 
                 soap_uri="http://schemas.xmlsoap.org/soap/envelope/", 
                 soap_ns='soap',
                 **kwargs):
        self.methods = {}
        self.name = name
        self.documentation = documentation
        self.action = action # base SoapAction
        self.location = location
        self.namespace = namespace # targetNamespace
        self.prefix = prefix
        self.soap_ns = soap_ns
        self.soap_uri = soap_uri
    
    def register_function(self, name, fn, returns=None, args=None, doc=None):
        self.methods[name] = fn, returns, args, doc or getattr(fn,"__doc__","")
        
    def dispatch(self, xml, action=None):
        "Receive and proccess SOAP call"
        # default values:
        prefix = self.prefix
        ret = fault = None
        soap_ns, soap_uri = self.soap_ns, self.soap_uri
        soap_fault_code = 'VersionMismatch'

        try:
            request = SimpleXMLElement(xml, namespace=self.namespace)

            # detect soap prefix and uri (xmlns attributes of Envelope)
            for k, v in request[:]:
                if v in ("http://schemas.xmlsoap.org/soap/envelope/",
                                  "http://www.w3.org/2003/05/soap-env",):
                    soap_ns = request.attributes()[k].localName
                    soap_uri = request.attributes()[k].value
            
            soap_fault_code = 'Client'
            
            # parse request message and get local method            
            method = request('Body', ns=soap_uri).children()(0)
            if action:
                # method name = action 
                name = action[len(self.action)+1:-1]
                prefix = self.prefix
            if not action or not name:
                # method name = input message name
                name = method.get_local_name()
                prefix = method.get_prefix()

            if DEBUG: print "dispatch method", name
            function, returns_types, args_types, doc = self.methods[name]
        
            # de-serialize parameters (if type definitions given)
            if args_types:
                args = method.children().unmarshall(args_types)
            elif args_types is None:
                args = {'request':method} # send raw request
            else:
                args = {} # no parameters
 
            soap_fault_code = 'Server'
            # execute function
            ret = function(**args)
            if DEBUG: print ret

        except Exception, e:
            import sys
            etype, evalue, etb = sys.exc_info()
            if DEBUG: 
                import traceback
                detail = ''.join(traceback.format_exception(etype, evalue, etb))
                detail += '\n\nXML REQUEST\n\n' + xml
            else:
                detail = None
            fault = {'faultcode': "%s.%s" % (soap_fault_code, etype.__name__), 
                     'faultstring': unicode(evalue), 
                     'detail': detail}

        # build response message
        if not prefix:
            xml = """<%(soap_ns)s:Envelope xmlns:%(soap_ns)s="%(soap_uri)s"/>"""  
        else:
            xml = """<%(soap_ns)s:Envelope xmlns:%(soap_ns)s="%(soap_uri)s"
                       xmlns:%(prefix)s="%(namespace)s"/>"""  
            
        xml = xml % {'namespace': self.namespace, 'prefix': prefix,
                     'soap_ns': soap_ns, 'soap_uri': soap_uri}

        response = SimpleXMLElement(xml, namespace=self.namespace,
                                    prefix=prefix)
    
        response['xmlns:xsi'] = "http://www.w3.org/2001/XMLSchema-instance"
        response['xmlns:xsd'] = "http://www.w3.org/2001/XMLSchema"

        body = response.add_child("%s:Body" % soap_ns, ns=False)
        if fault:
            # generate a Soap Fault (with the python exception)
            body.marshall("%s:Fault" % soap_ns, fault, ns=False)
        else:
            # return normal value
            res = body.add_child("%sResponse" % name, ns=prefix)
            if not prefix:
                res['xmlns'] = self.namespace # add target namespace

            # serialize returned values (response) if type definition available
            if returns_types:
                if not isinstance(ret, dict):
                    res.marshall(returns_types.keys()[0], ret, )
                else:
                    for k,v in ret.items():
                        res.marshall(k, v)
            elif returns_types is None:
                # merge xmlelement returned
                res.import_node(ret)

        return response.as_xml()

    # Introspection functions:

    def list_methods(self):
        "Return a list of aregistered operations"
        return [(method, doc) for method, (function, returns, args, doc) in self.methods.items()] 

    def help(self, method=None):
        "Generate sample request and response messages"
        (function, returns, args, doc) = self.methods[method]
        xml = """
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
<soap:Body><%(method)s xmlns="%(namespace)s"/></soap:Body>
</soap:Envelope>"""  % {'method':method, 'namespace':self.namespace}
        request = SimpleXMLElement(xml, namespace=self.namespace, prefix=self.prefix)
        if args:
            items = args.items()
        elif args is None:
            items = [('value', None)]
        else:
            items = []
        for k,v in items:
            request(method).marshall(k, v, add_comments=True, ns=False)

        xml = """
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
<soap:Body><%(method)sResponse xmlns="%(namespace)s"/></soap:Body>
</soap:Envelope>"""  % {'method':method, 'namespace':self.namespace}
        response = SimpleXMLElement(xml, namespace=self.namespace, prefix=self.prefix)
        if returns:
            items = returns.items()
        elif args is None:
            items = [('value', None)]
        else:
            items = []
        for k,v in items:
            response('%sResponse'%method).marshall(k, v, add_comments=True, ns=False)

        return request.as_xml(pretty=True), response.as_xml(pretty=True), doc


    def wsdl(self):
        "Generate Web Service Description v1.1"
        xml = """<?xml version="1.0"?>
<wsdl:definitions name="%(name)s" 
          targetNamespace="%(namespace)s"
          xmlns:tns="%(namespace)s"
          xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/"
          xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/"
          xmlns:xsd="http://www.w3.org/2001/XMLSchema">
    <wsdl:documentation xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/">%(documentation)s</wsdl:documentation>

    <wsdl:types>
       <xsd:schema targetNamespace="%(namespace)s"
              elementFormDefault="qualified"
              xmlns:xsd="http://www.w3.org/2001/XMLSchema">
       </xsd:schema>
    </wsdl:types>

</wsdl:definitions>
""" % {'namespace': self.namespace, 'name': self.name, 'documentation': self.documentation}
        wsdl = SimpleXMLElement(xml)

        for method, (function, returns, args, doc) in self.methods.items():
            # create elements:
                
            def parse_element(name, values, array=False, complex=False):
                if not complex:
                    element = wsdl('wsdl:types')('xsd:schema').add_child('xsd:element')
                    complex = element.add_child("xsd:complexType")
                else:
                    complex = wsdl('wsdl:types')('xsd:schema').add_child('xsd:complexType')
                    element = complex
                element['name'] = name
                if values:
                    items = values
                elif values is None:
                    items = [('value', None)]
                else:
                    items = []
                if not array and items:
                    all = complex.add_child("xsd:all")
                elif items:
                    all = complex.add_child("xsd:sequence")
                for k,v in items:
                    e = all.add_child("xsd:element")
                    e['name'] = k
                    if array:
                        e[:]={'minOccurs': "0", 'maxOccurs': "unbounded"}
                    if v in TYPE_MAP.keys():
                        t='xsd:%s' % TYPE_MAP[v]
                    elif v is None:
                        t='xsd:anyType'
                    elif isinstance(v, list):
                        n="ArrayOf%s%s" % (name, k)
                        l = []
                        for d in v:
                            l.extend(d.items())
                        parse_element(n, l, array=True, complex=True)
                        t = "tns:%s" % n
                    elif isinstance(v, dict): 
                        n="%s%s" % (name, k)
                        parse_element(n, v.items(), complex=True)
                        t = "tns:%s" % n
                    e.add_attribute('type', t)
            
            parse_element("%s" % method, args and args.items())
            parse_element("%sResponse" % method, returns and returns.items())

            # create messages:
            for m,e in ('Input',''), ('Output','Response'):
                message = wsdl.add_child('wsdl:message')
                message['name'] = "%s%s" % (method, m)
                part = message.add_child("wsdl:part")
                part[:] = {'name': 'parameters', 
                           'element': 'tns:%s%s' % (method,e)}

        # create ports
        portType = wsdl.add_child('wsdl:portType')
        portType['name'] = "%sPortType" % self.name
        for method, (function, returns, args, doc) in self.methods.items():
            op = portType.add_child('wsdl:operation')
            op['name'] = method
            if doc:
                op.add_child("wsdl:documentation", doc)
            input = op.add_child("wsdl:input")
            input['message'] = "tns:%sInput" % method
            output = op.add_child("wsdl:output")
            output['message'] = "tns:%sOutput" % method

        # create bindings
        binding = wsdl.add_child('wsdl:binding')
        binding['name'] = "%sBinding" % self.name
        binding['type'] = "tns:%sPortType" % self.name
        soapbinding = binding.add_child('soap:binding')
        soapbinding['style'] = "document"
        soapbinding['transport'] = "http://schemas.xmlsoap.org/soap/http"
        for method in self.methods.keys():
            op = binding.add_child('wsdl:operation')
            op['name'] = method
            soapop = op.add_child('soap:operation')
            soapop['soapAction'] = self.action + method
            soapop['style'] = 'document'
            input = op.add_child("wsdl:input")
            ##input.add_attribute('name', "%sInput" % method)
            soapbody = input.add_child("soap:body")
            soapbody["use"] = "literal"
            output = op.add_child("wsdl:output")
            ##output.add_attribute('name', "%sOutput" % method)
            soapbody = output.add_child("soap:body")
            soapbody["use"] = "literal"

        service = wsdl.add_child('wsdl:service')
        service["name"] = "%sService" % self.name
        service.add_child('wsdl:documentation', text=self.documentation)
        port=service.add_child('wsdl:port')
        port["name"] = "%s" % self.name
        port["binding"] = "tns:%sBinding" % self.name
        soapaddress = port.add_child('soap:address')
        soapaddress["location"] = self.location
        return wsdl.as_xml(pretty=True)
    

from BaseHTTPServer import BaseHTTPRequestHandler, HTTPServer
class SOAPHandler(BaseHTTPRequestHandler):
    def do_GET(self):
        "User viewable help information and wsdl"
        args = self.path[1:].split("?")
        print "serving", args
        if self.path != "/" and args[0] not in self.server.dispatcher.methods.keys():
            self.send_error(404, "Method not found: %s" % args[0])
        else:
            if self.path == "/":
                # return wsdl if no method supplied
                response = self.server.dispatcher.wsdl()
            else:
                # return supplied method help (?request or ?response messages)
                req, res, doc = self.server.dispatcher.help(args[0])
                if len(args)==1 or args[1]=="request":
                    response = req
                else:
                    response = res                
            self.send_response(200)
            self.send_header("Content-type", "text/xml")
            self.end_headers()
            self.wfile.write(response)

    def do_POST(self):
        "SOAP POST gateway"
        self.send_response(200)
        self.send_header("Content-type", "text/xml")
        self.end_headers()
        request = self.rfile.read(int(self.headers.getheader('content-length')))
        response = self.server.dispatcher.dispatch(request)
        self.wfile.write(response)


if __name__=="__main__":
    import sys

    dispatcher = SoapDispatcher(
        name = "PySimpleSoapSample",
        location = "http://localhost:8008/",
        action = 'http://localhost:8008/', # SOAPAction
        namespace = "http://example.com/pysimplesoapsamle/", prefix="ns0",
        documentation = 'Example soap service using PySimpleSoap',
        trace = True,
        ns = True)
    
    def adder(p,c, dt=None):
        "Add several values"
        print c[0]['d'],c[1]['d'],
        import datetime
        dt = dt + datetime.timedelta(365)
        return {'ab': p['a']+p['b'], 'dd': c[0]['d']+c[1]['d'], 'dt': dt}

    def dummy(in0):
        "Just return input"
        return in0

    def echo(request):
        "Copy request->response (generic, any type)"
        return request.value

    dispatcher.register_function('Adder', adder,
        returns={'AddResult': {'ab': int, 'dd': str } }, 
        args={'p': {'a': int,'b': int}, 'dt': Date, 'c': [{'d': Decimal}]})

    dispatcher.register_function('Dummy', dummy,
        returns={'out0': str}, 
        args={'in0': str})

    dispatcher.register_function('Echo', echo)

    if '--local' in sys.argv:

        wsdl=dispatcher.wsdl()
        print wsdl
        open("C:/test.wsdl","w").write(wsdl)
        # dummy local test (clasic soap dialect)
        xml = """<?xml version="1.0" encoding="UTF-8"?> 
    <soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
       <soap:Body>
         <Adder xmlns="http://example.com/sample.wsdl">
           <p><a>1</a><b>2</b></p><c><d>5000000.1</d><d>.2</d></c><dt>20100724</dt>
        </Adder>
       </soap:Body>
    </soap:Envelope>"""

        print dispatcher.dispatch(xml)

        # dummy local test (modern soap dialect, SoapUI)
        xml = """
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:pys="http://example.com/pysimplesoapsamle/">
   <soapenv:Header/>
   <soapenv:Body>
      <pys:Adder>
         <pys:p><pys:a>9</pys:a><pys:b>3</pys:b></pys:p>
         <pys:dt>19690720<!--1969-07-20T21:28:00--></pys:dt>
         <pys:c><pys:d>10.001</pys:d><pys:d>5.02</pys:d></pys:c>
      </pys:Adder>
   </soapenv:Body>
</soapenv:Envelope>
    """
        print dispatcher.dispatch(xml)

        # echo local test (generic soap service)
        xml = """<?xml version="1.0" encoding="UTF-8"?> 
    <soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"
                   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
                   xmlns:xsd="http://www.w3.org/2001/XMLSchema">
       <soap:Body>
         <Echo xmlns="http://example.com/sample.wsdl">
           <value xsi:type="xsd:string">Hello world</value>
        </Echo>
       </soap:Body>
    </soap:Envelope>"""

        print dispatcher.dispatch(xml)


        for method, doc in dispatcher.list_methods():
            request, response, doc = dispatcher.help(method)
            ##print request
            ##print response
            
    if '--serve' in sys.argv:
        print "Starting server..."
        httpd = HTTPServer(("", 8008), SOAPHandler)
        httpd.dispatcher = dispatcher
        httpd.serve_forever()

    if '--consume' in sys.argv:
        from client import SoapClient
        client = SoapClient(
            location = "http://localhost:8008/",
            action = 'http://localhost:8008/', # SOAPAction
            namespace = "http://example.com/sample.wsdl", 
            soap_ns='soap',
            trace = True,
            ns = False)
        response = client.Adder(p={'a':1,'b':2},dt='20100724',c=[{'d':'1.20'},{'d':'2.01'}])
        result = response.AddResult
        print int(result.ab)
        print str(result.dd)