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//------------------------------------------------------------
// Copyright (c) Microsoft Corporation. All rights reserved.
//------------------------------------------------------------
namespace System.ServiceModel.Activation
{
using System.Web;
using System.Web.Hosting;
using System.IO;
using System.ServiceModel.Diagnostics;
using System.Web.Compilation;
using System.Reflection;
using System.Workflow.Runtime;
using System.Workflow.ComponentModel.Compiler;
using System.Diagnostics;
[Obsolete("The WF3 types are deprecated. Instead, please use the new WF4 types from System.Activities.*")]
public class WorkflowServiceHostFactory : ServiceHostFactoryBase
{
TypeProvider typeProvider;
public override ServiceHostBase CreateServiceHost(string constructorString, Uri[] baseAddresses)
{
WorkflowDefinitionContext workflowDefinitionContext = null;
Stream workflowDefinitionStream = null;
Stream ruleDefinitionStream = null;
if (string.IsNullOrEmpty(constructorString))
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new InvalidOperationException(SR2.GetString(SR2.WorkflowServiceHostFactoryConstructorStringNotProvided)));
}
if (!HostingEnvironment.IsHosted)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new InvalidOperationException(SR2.GetString(SR2.ProcessNotExecutingUnderHostedContext)));
}
Type workflowType = this.GetTypeFromString(constructorString, baseAddresses);
if (workflowType != null)
{
workflowDefinitionContext = new CompiledWorkflowDefinitionContext(workflowType);
}
else
{
try
{
IDisposable impersonationContext = null;
try
{
try
{
}
finally
{
//Ensure thread.Abort doesnt interfere b/w impersonate & assignment.
impersonationContext = HostingEnvironment.Impersonate();
}
string xomlVirtualPath = Path.Combine(AspNetEnvironment.Current.CurrentVirtualPath, constructorString);
if (HostingEnvironment.VirtualPathProvider.FileExists(xomlVirtualPath))
{
workflowDefinitionStream = HostingEnvironment.VirtualPathProvider.GetFile(xomlVirtualPath).Open();
string ruleFilePath = Path.ChangeExtension(xomlVirtualPath, WorkflowServiceBuildProvider.ruleFileExtension);
if (HostingEnvironment.VirtualPathProvider.FileExists(ruleFilePath))
{
ruleDefinitionStream = HostingEnvironment.VirtualPathProvider.GetFile(ruleFilePath).Open();
workflowDefinitionContext = new StreamedWorkflowDefinitionContext(workflowDefinitionStream, ruleDefinitionStream, this.typeProvider);
}
else
{
workflowDefinitionContext = new StreamedWorkflowDefinitionContext(workflowDefinitionStream, null, this.typeProvider);
}
}
}
finally
{
if (impersonationContext != null)
{
impersonationContext.Dispose();
}
}
}
catch
{
throw; //Prevent impersonation leak through Exception Filters.
}
finally
{
if (workflowDefinitionStream != null)
{
workflowDefinitionStream.Close();
}
if (ruleDefinitionStream != null)
{
ruleDefinitionStream.Close();
}
}
}
if (workflowDefinitionContext == null)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new InvalidOperationException(SR2.GetString(SR2.CannotResolveConstructorStringToWorkflowType, constructorString)));
}
WorkflowServiceHost serviceHost = new WorkflowServiceHost(workflowDefinitionContext, baseAddresses);
if (DiagnosticUtility.ShouldTraceInformation)
{
TraceUtility.TraceEvent(TraceEventType.Information, TraceCode.WorkflowServiceHostCreated, SR.GetString(SR.TraceCodeWorkflowServiceHostCreated), this);
}
return serviceHost;
}
Type GetTypeFromString(string typeString, Uri[] baseAddresses)
{
if (baseAddresses == null)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgumentNull("baseAddresses");
}
if (baseAddresses.Length == 0)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new InvalidOperationException(SR2.GetString(SR2.BaseAddressesNotProvided)));
}
Type workflowType = Type.GetType(typeString, false);
if (workflowType == null)
{
this.typeProvider = new TypeProvider(null);
// retrieve the reference assembly names from the compiled string supplied by the build manager
string compiledString;
try
{
IDisposable impersonationContext = null;
try
{
try
{
}
finally
{
//Ensure Impersonation + Assignment is atomic w.r.t to potential Thread.Abort.
impersonationContext = HostingEnvironment.Impersonate();
}
compiledString = BuildManager.GetCompiledCustomString(baseAddresses[0].AbsolutePath);
}
finally
{
if (impersonationContext != null)
{
impersonationContext.Dispose();
}
}
}
catch
{
throw; //Prevent impersonation leak through exception filters.
}
if (string.IsNullOrEmpty(compiledString))
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new InvalidOperationException(SR2.GetString(SR2.InvalidCompiledString, baseAddresses[0].AbsolutePath)));
}
string[] components = compiledString.Split('|');
if (components.Length < 3)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new InvalidOperationException(SR2.GetString(SR2.InvalidCompiledString, baseAddresses[0].AbsolutePath)));
}
//Walk reverse direction to increase our chance to match assembly;
for (int i = (components.Length - 1); i > 2; i--)
{
Assembly assembly = Assembly.Load(components[i]);
this.typeProvider.AddAssembly(assembly);
workflowType = assembly.GetType(typeString, false);
if (workflowType != null)
{
break;
}
}
if (workflowType == null)
{
foreach (Assembly assembly in AppDomain.CurrentDomain.GetAssemblies())
{
this.typeProvider.AddAssembly(assembly);
workflowType = assembly.GetType(typeString, false);
if (workflowType != null)
{
break;
}
}
}
}
return workflowType;
}
}
}
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