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//------------------------------------------------------------
// Copyright (c) Microsoft Corporation. All rights reserved.
//------------------------------------------------------------
namespace System.ServiceModel.Activities.Activation
{
using System.Activities;
using System.Activities.XamlIntegration;
using System.CodeDom;
using System.CodeDom.Compiler;
using System.Collections.Generic;
using System.Diagnostics.CodeAnalysis;
using System.IO;
using System.Reflection;
using System.Runtime;
using System.ServiceModel.Activation;
using System.Web;
using System.Web.Compilation;
sealed class XamlBuildProviderExtension : System.Xaml.Hosting.IXamlBuildProviderExtension
{
const string GeneratedNamespace = "GeneratedNamespace";
const string ExpressionRootFactorySuffix = "_ExpressionRootFactory";
const string CreateExpressionRootMethodName = "CreateExpressionRoot";
const string ActivityParameterName = "activity";
string generatedPrimaryTypeName;
internal XamlBuildProviderExtension()
{
AspNetPartialTrustHelpers.FailIfInPartialTrustOutsideAspNet();
}
public void GenerateCode(AssemblyBuilder assemblyBuilder, Stream xamlStream, BuildProvider buildProvider)
{
object serviceObject = WorkflowServiceHostFactory.LoadXaml(xamlStream);
WorkflowService workflowService = serviceObject as WorkflowService;
if (workflowService != null && workflowService.Body != null)
{
string activityName;
if (this.TryGenerateSource(assemblyBuilder, buildProvider, workflowService, false, null, out activityName))
{
this.generatedPrimaryTypeName = GeneratedNamespace + "." + activityName + ExpressionRootFactorySuffix;
}
// find all supported versions xamlx files, load and compile them
IList<Tuple<string, Stream>> streams = null;
string xamlVirtualFile = GetXamlVirtualPath(buildProvider);
string xamlFileName = Path.GetFileNameWithoutExtension(VirtualPathUtility.GetFileName(xamlVirtualFile));
WorkflowServiceHostFactory.GetSupportedVersionStreams(xamlFileName, out streams);
if (streams != null)
{
try
{
foreach (Tuple<string, Stream> stream in streams)
{
try
{
WorkflowService service = WorkflowServiceHostFactory.CreatetWorkflowService(stream.Item2, workflowService.Name);
if (service != null && service.Body != null)
{
this.TryGenerateSource(assemblyBuilder, buildProvider, service, true, stream.Item1, out activityName);
}
}
catch (Exception e)
{
Exception newException;
if (Fx.IsFatal(e) || !WorkflowServiceHostFactory.TryWrapSupportedVersionException(stream.Item1, e, out newException))
{
throw;
}
throw FxTrace.Exception.AsError(newException);
}
}
}
finally
{
foreach (Tuple<string, Stream> stream in streams)
{
stream.Item2.Dispose();
}
}
}
}
}
public Type GetGeneratedType(CompilerResults results)
{
if (this.generatedPrimaryTypeName != null)
{
return results.CompiledAssembly.GetType(this.generatedPrimaryTypeName);
}
return null;
}
// if the 1st parameter "supportedVersionXamlxfilePath" is null, we fall back to the primary generated type
internal static ICompiledExpressionRoot GetExpressionRoot(string supportedVersionXamlxfilePath, WorkflowService service, string virtualPath)
{
Assembly compiledAssembly = BuildManager.GetCompiledAssembly(virtualPath);
if (compiledAssembly == null)
{
return null;
}
Type generatedType;
if (supportedVersionXamlxfilePath != null)
{
string fullTypeNameToSearch = GeneratedNamespace + "." + WorkflowServiceHostFactory.GetSupportedVersionGeneratedTypeName(supportedVersionXamlxfilePath) + ExpressionRootFactorySuffix;
generatedType = compiledAssembly.GetType(fullTypeNameToSearch);
}
else
{
generatedType = BuildManager.GetCompiledType(virtualPath);
}
Type workflowServiceType = typeof(WorkflowService);
if (generatedType != workflowServiceType && workflowServiceType.IsAssignableFrom(generatedType))
{
MethodInfo createExpressionRootMethod = generatedType.GetMethod(CreateExpressionRootMethodName, BindingFlags.Public | BindingFlags.Static);
if (createExpressionRootMethod != null)
{
return (ICompiledExpressionRoot)createExpressionRootMethod.Invoke(null, new object[] { service.Body });
}
}
return null;
}
bool TryGenerateSource(AssemblyBuilder assemblyBuilder, BuildProvider buildProvider, WorkflowService workflowService, bool isSupportedVersion, string filePath, out string activityName)
{
bool generatedSource;
string codeFileName;
this.GenerateSource(isSupportedVersion, filePath, assemblyBuilder, workflowService, out codeFileName, out generatedSource, out activityName);
if (generatedSource)
{
this.WriteCodeFile(assemblyBuilder, buildProvider, codeFileName);
this.GenerateExpressionRootFactory(assemblyBuilder, buildProvider, GeneratedNamespace, activityName);
}
return generatedSource;
}
void GenerateExpressionRootFactory(AssemblyBuilder assemblyBuilder, BuildProvider buildProvider, string activityNamespace, string activityName)
{
CodeCompileUnit codeCompileUnit = new CodeCompileUnit();
// namespace <%= activityNamespace %>
// {
// public class <%= activityName %>_ExpressionRootFactory : System.ServiceModel.Activities.WorkflowService
// {
// public static System.Activities.XamlIntegration.ICompiledExpressionRoot CreateExpressionRoot(System.Activities.Activity activity)
// {
// return new <%= activityNamespace %>.<%= activityName %>(activity);
// }
// }
// }
CodeNamespace codeNamespace = new CodeNamespace(activityNamespace);
CodeTypeDeclaration codeTypeDeclaration = new CodeTypeDeclaration(activityName + ExpressionRootFactorySuffix);
codeTypeDeclaration.BaseTypes.Add(new CodeTypeReference(typeof(WorkflowService)));
CodeMemberMethod codeMemberMethod = new CodeMemberMethod();
codeMemberMethod.Name = CreateExpressionRootMethodName;
codeMemberMethod.Attributes = MemberAttributes.Public | MemberAttributes.Static;
codeMemberMethod.ReturnType = new CodeTypeReference(typeof(ICompiledExpressionRoot));
codeMemberMethod.Parameters.Add(new CodeParameterDeclarationExpression(
new CodeTypeReference(typeof(Activity)),
ActivityParameterName));
CodeTypeReference typeRef = new CodeTypeReference(activityNamespace + "." + activityName);
CodeObjectCreateExpression expr = new CodeObjectCreateExpression(typeRef, new CodeArgumentReferenceExpression(ActivityParameterName));
codeMemberMethod.Statements.Add(new CodeMethodReturnStatement(expr));
codeTypeDeclaration.Members.Add(codeMemberMethod);
codeNamespace.Types.Add(codeTypeDeclaration);
codeCompileUnit.Namespaces.Add(codeNamespace);
assemblyBuilder.AddCodeCompileUnit(buildProvider, codeCompileUnit);
}
void GenerateSource(bool isSupportedVersion, string filePath, AssemblyBuilder assemblyBuilder, WorkflowService workflowService, out string codeFileName, out bool generatedSource, out string activityName)
{
// Get unique file and type name for the workflowservice
codeFileName = assemblyBuilder.GetTempFilePhysicalPath(assemblyBuilder.CodeDomProvider.FileExtension);
if (isSupportedVersion)
{
activityName = WorkflowServiceHostFactory.GetSupportedVersionGeneratedTypeName(filePath);
}
else
{
activityName = workflowService.Name.LocalName + "_" + Guid.NewGuid().ToString().Replace("-", "_");
}
TextExpressionCompilerSettings settings = new TextExpressionCompilerSettings
{
Activity = workflowService.Body,
ActivityName = activityName,
ActivityNamespace = GeneratedNamespace,
Language = CodeDomProvider.GetLanguageFromExtension(assemblyBuilder.CodeDomProvider.FileExtension),
GenerateAsPartialClass = false,
AlwaysGenerateSource = false,
ForImplementation = false
};
TextExpressionCompiler compiler = new TextExpressionCompiler(settings);
generatedSource = false;
using (StreamWriter fileStream = new StreamWriter(codeFileName))
{
try
{
generatedSource = compiler.GenerateSource(fileStream);
}
catch (Exception ex)
{
if (Fx.IsFatal(ex))
{
throw;
}
throw FxTrace.Exception.AsError(new HttpCompileException(SR.XamlBuildProviderExtensionException(ex.Message)));
}
}
}
void WriteCodeFile(AssemblyBuilder assemblyBuilder, BuildProvider buildProvider, string name)
{
using (TextWriter codeFile = assemblyBuilder.CreateCodeFile(buildProvider))
{
foreach (string line in File.ReadLines(name))
{
codeFile.WriteLine(line);
}
}
}
// XamlBuildProvider is defined in a non-APTCA assembly and this aptca method calls it. This allows partially trusted callers to indirectly
// call the XamlBuildProvider.VirtualPath property (that requires full trust to call directly). This is safe because this private method
// does not directly or indirectly allows users to access sensitive information, operations, or resources that can be used in a destructive manner.
[SuppressMessage(FxCop.Category.Security, FxCop.Rule.AptcaMethodsShouldOnlyCallAptcaMethods, Justification = "The XamlBuildProvider.VirtualPath non-aptca property cannot be used in a destructive manner.")]
private string GetXamlVirtualPath(BuildProvider buildProvider)
{
return ((System.Xaml.Hosting.XamlBuildProvider)buildProvider).VirtualPath;
}
}
}
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