public object Execute(ExecContext ctx)
{
if (ctx == null)
{
throw new ArgumentNullException("ctx", "Execution context cannot be null");
}
object objInvokeResult = null;
string strRetVal = "";
string strError = "";
// Load Assembly containing web service proxy
bool bProxyMethodHasParameters = false;
Assembly a = Assembly.LoadFrom(ctx.Assembly);
// Get the correct type (ProxyClass)
Type ProxyType = a.GetType(ctx.ServiceName);
// Create an instance of the Proxy Class
Object objProxy = a.CreateInstance(ctx.ServiceName);
if (objProxy == null || ProxyType == null)
{
strError = "Cannot create type/proxy instance ";
strError += ctx.ServiceName;
strError += " in assembly ";
strError += ctx.Assembly;
throw new Exception(strError);
}
// Check whether Proxy class has a property
// called Url, valid for generated
// proxies, if it does check its value
// if value is empty fill in proxy access point
PropertyInfo Url = ProxyType.GetProperty("Url");
if (Url != null)
{
string strUrl = (string)Url.GetValue(objProxy, null);
if (strUrl.Length == 0)
{
Url.SetValue(objProxy, ctx.AccessPointUrl, null);
}
}
// Once we have a Proxy Object and a Type instance
// use reflection to get info on method to be
// executed.
MethodInfo mInfo = ProxyType.GetMethod(ctx.MethodName);
if (mInfo == null)
{
strError = "Cannot find method ";
strError += ctx.MethodName;
strError += " of Proxy ";
strError += ctx.ServiceName;
strError += " loaded from assembly ";
strError += ctx.Assembly;
throw new System.Exception(strError);
}
// Get info on parameters expected by Proxy method
ParameterInfo[] arrParamInfo = mInfo.GetParameters();
if (arrParamInfo.Length > 0)
{
bProxyMethodHasParameters = true;
}
Object[] param = null;
if (bProxyMethodHasParameters)
{
// Number parameters passed not equal to number parameters expected
if (ctx.Parameters.Count != arrParamInfo.Length)
{
throw new Exception("Wrong Number of Arguments Passed to Proxy ");
}
// Create array to hold parameters
param = new Object[arrParamInfo.Length];
// Try deserialization
for (int i = 0; i < ctx.Parameters.Count; i++)
{
// Get the expected type
Type paramType = arrParamInfo[i].ParameterType;
// Create XmlSerializer
XmlSerializer xs = new XmlSerializer(paramType);
// Read in Xml doc representing parameter
System.Xml.XmlReader xt = new XmlTextReader((string)ctx.Parameters[i], XmlNodeType.Document, null);
xt.Read();
// Deserialize
Object paramInst = xs.Deserialize(xt);
// Store in parameter array
param[i] = (Object)paramInst;
}
} // End if bProxyMethodHasParameters
// Add digital signatures and/or encryption based on
// the Executor settings
if (m_settings.SignSoapMessage || m_settings.EncryptSoapMessage)
{
// Sign message
X509SecurityToken signatureToken = new X509SecurityToken(this.Settings.SigningCertificate);
// Ask proxy for RequestContext property
PropertyInfo requestSoapContextProp = ProxyType.GetProperty("RequestSoapContext");
SoapContext reqSoapCtx = null;
// If property exists
if (requestSoapContextProp != null)
{
// Get property value
reqSoapCtx = (SoapContext)requestSoapContextProp.GetValue(objProxy, null);
// Make changes to property value
// Add security token to SOAP message header
reqSoapCtx.Security.Tokens.Add(signatureToken);
// Create a signature element from the token
Signature sig = new Signature(signatureToken);
// Sign the mesage body
sig.SignatureOptions = SignatureOptions.IncludeSoapBody;
// Add digital signature
reqSoapCtx.Security.Elements.Add(sig);
// Encrypt SOAP message
if (m_settings.EncryptSoapMessage)
{
X509SecurityToken encryptionToken = new X509SecurityToken(this.m_settings.EncryptionCertificate);
// Add encryption token to SOAP message header
reqSoapCtx.Security.Tokens.Add(encryptionToken);
// Encrypt message
EncryptedData enc = new EncryptedData(encryptionToken);
reqSoapCtx.Security.Elements.Add(enc);
} // End-if encrypting SOAP message
} // End-if RequestSoapContext property exposed by proxy
} //End-if SOAP message is to be digitally signed or encrypted
if (bProxyMethodHasParameters)
{
objInvokeResult = ProxyType.InvokeMember(ctx.MethodName,
BindingFlags.Public | BindingFlags.InvokeMethod | BindingFlags.Instance | BindingFlags.Static,
null,
objProxy,
param);
}
else
{
objInvokeResult = ProxyType.InvokeMember(ctx.MethodName,
BindingFlags.Public | BindingFlags.InvokeMethod | BindingFlags.Instance | BindingFlags.Static,
null,
objProxy,
null);
}
// Check for digitally signed response
if (this.m_settings.ExpectSignedResponse)
{
this.m_settings.ResponseCertificate = null;
// Get the response certificate
// Ask proxy for ResponseContext property
PropertyInfo responseSoapContextProp = ProxyType.GetProperty("ResponseSoapContext");
SoapContext respSoapCtx = null;
// If property exists
if (responseSoapContextProp != null)
{
// Get property value
respSoapCtx = (SoapContext)responseSoapContextProp.GetValue(objProxy, null);
// Inspect the response SOAP context
if (respSoapCtx.Security.Elements.Count != 1)
{
throw new Exception("Expected a single security element");
}
object objElement = respSoapCtx.Security.Elements[0];
if (!(objElement is Microsoft.Web.Services.Security.Signature))
{
throw new Exception("Expected a digital signature element");
}
Microsoft.Web.Services.Security.Signature signature = objElement as Microsoft.Web.Services.Security.Signature;
if (signature.SignatureOptions != SignatureOptions.IncludeSoapBody)
{
throw new Exception("Expected the body of the SOAP message to be signed");
}
// If the signature verifies set the response cert
if (!signature.CheckSignature())
{
throw new Exception("Error verifying digital signature");
}
X509SecurityToken tok = (X509SecurityToken)signature.SecurityToken;
this.m_settings.ResponseCertificate = tok.Certificate;
}
}
if (objInvokeResult != null)
{
// Otherwise serialize results to XML
// Get returned type
Type returnType = objInvokeResult.GetType();
// Create XmlSerializer
XmlSerializer ser = new XmlSerializer(returnType);
// Create a memory stream
MemoryStream ms = new MemoryStream();
// Serialize to stream ms
ser.Serialize(ms, objInvokeResult);
// Goto start of stream
ms.Seek(0, System.IO.SeekOrigin.Begin);
// Create a stream reader
TextReader reader = new StreamReader(ms);
// Read entire stream, this is our return value
strRetVal = reader.ReadToEnd();
// Close reader
reader.Close();
// Close stream
ms.Close();
}
return(strRetVal);
}
public object Execute(object objCtx)
{
ExecContext ctx = objCtx as ExecContext;
return(this.Execute(ctx));
}
