InspectionWorker.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / AddIn / AddIn / System / Addin / Hosting / InspectionWorker.cs / 1305376 / InspectionWorker.cs
                        

                        
                            // ==++== 
//
//   Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ==--== 
using System;
using System.Collections.Generic; 
using System.Collections.ObjectModel; 
using System.Diagnostics;
using System.Globalization; 
using System.IO;
using System.Reflection;
using System.Runtime.Serialization;
using System.Runtime.Serialization.Formatters.Binary; 
using System.Security;
using System.Security.Permissions; 
using System.Text; 
using System.Threading;
using System.AddIn.MiniReflection; 
using System.AddIn.Pipeline;
using System.AddIn;
using System.Diagnostics.Contracts;
 
namespace System.AddIn.Hosting
{ 
 
    [Serializable]
    internal struct InspectionResults 
    {
        internal List Components;
        internal Collection Warnings;
    } 

    internal sealed class InspectionWorker : MarshalByRefObject 
    { 
        private String _assemblyFileName;
        private String _pipelineRootDirectory; 
        private PipelineComponentType _currentComponentType;
        private static Assembly SystemAddInInReflectionOnlyContext;
        private static Assembly SystemAddInContractsInReflectionOnlyContext;
 
        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Performance", "CA1810:InitializeReferenceTypeStaticFieldsInline", Justification="Initialization needs to be done in this order")]
        static InspectionWorker() 
        { 
            // Since we're using Reflection-only LoadFrom, we must pre-load
            // dependent assemblies, such as System.AddIn.dll (this assembly). 

            SystemAddInInReflectionOnlyContext = Assembly.ReflectionOnlyLoad(typeof(AddInStore).Assembly.FullName);
            SystemAddInContractsInReflectionOnlyContext = Assembly.ReflectionOnlyLoad(typeof(System.AddIn.Contract.IContract).Assembly.FullName);
            PipelineComponent.SetTypesFromReflectionLoaderContext(SystemAddInInReflectionOnlyContext, SystemAddInContractsInReflectionOnlyContext); 
        }
 
        // Soon, this assembly resolve event won't be used during inspection. 
        // But we'll need this exact same code during activation.
        internal Assembly ResolveAssembly(Object sender, ResolveEventArgs args) 
        {
            String assemblyRef = args.Name;
            // I need to look in both the directory structure on disk for add-in
            // pipeline components, as well as in the GAC for assemblies like 
            // System.dll, which I haven't pre-loaded into the ReflectionOnly
            // loader context. 
            // LoadFrom respects publisher policy, but ReflectionOnlyLoadFrom doesn't, 
            // but that's OK.
            // Do I have to look in the GAC _first_ to mimic behavior 
            // at runtime, which would respect policy when calling LoadFrom?
            // The problem with that is I'll be looking in the GAC for assemblies
            // that won't exist some portion of the time, meaning we have
            // to throw and ---- FileNotFoundExceptions.  The debugging experience 
            // and performance are horrible.
 
            String simpleName = assemblyRef.Substring(0, assemblyRef.IndexOf(',')); 
            if (String.Equals(simpleName, "System.AddIn"))
                return SystemAddInInReflectionOnlyContext; 
            if (String.Equals(simpleName, "System.AddIn.Contract"))
                return SystemAddInContractsInReflectionOnlyContext;
            String rootDir = Path.GetDirectoryName(Path.GetDirectoryName(_assemblyFileName));
            if (_currentComponentType == PipelineComponentType.AddIn) 
                rootDir = Path.GetDirectoryName(rootDir);
 
            List dirsToLookIn = new List(); 
            switch(_currentComponentType)
            { 
                case PipelineComponentType.HostAdapter:
                    // Look in contract directory.  For loading the HAV,
                    // we can't do that at discovery time since we don't know
                    // which directory contains the HAV.  This is why we're 
                    // writing our own metadata parser in managed code.
                    // At activation time, the HAV should already be loaded 
                    // within the host's AppDomain. 
                    dirsToLookIn.Add(Path.Combine(rootDir, AddInStore.ContractsDirName));
                    break; 

                case PipelineComponentType.Contract:
                    break;
 
                case PipelineComponentType.AddInAdapter:
                    // Look in contract directory and addin base directory. 
                    dirsToLookIn.Add(Path.Combine(rootDir, AddInStore.ContractsDirName)); 
                    dirsToLookIn.Add(Path.Combine(rootDir, AddInStore.AddInBasesDirName));
                    break; 

                case PipelineComponentType.AddInBase:
                    // look for other assemblies in the same folder
                    dirsToLookIn.Add(Path.Combine(rootDir, AddInStore.AddInBasesDirName)); 
                    // @
 
 

 
                    break;

                    /*
                case PipelineComponentType.AddIn: 
                    // Look in both the add-in's directory and the add-in base's
                    // directory.  We do the first by setting the app base for the AppDomain, 
                    // but we may not be able to do that if the user created the appdomain. 
                    dirsToLookIn.Add(Path.Combine(rootDir, AddInBasesDirName));
                    dirsToLookIn.Add(Path.GetDirectoryName(_assemblyFileName)); 
                    break;
                    */

                default: 
                    System.Diagnostics.Contracts.Contract.Assert(false, "Fell through switch in the inspection assembly resolve event!");
                    break; 
            } 

            List potentialFileNames = new List(dirsToLookIn.Count * 2); 
            foreach (String path in dirsToLookIn)
            {
                String simpleFileName = Path.Combine(path, simpleName);
                String dllName = simpleFileName + ".dll"; 
                if (File.Exists(dllName))
                    potentialFileNames.Add(dllName); 
                else if (File.Exists(simpleFileName + ".exe")) 
                    potentialFileNames.Add(simpleFileName + ".exe");
            } 

            foreach (String fileName in potentialFileNames)
            {
                try 
                {
                    Assembly a = Assembly.ReflectionOnlyLoadFrom(fileName); 
                    // We should at least be comparing the public key token 
                    // for the two assemblies here.  The version numbers may
                    // potentially be different, dependent on publisher policy. 
                    if (Utils.AssemblyRefEqualsDef(assemblyRef, a.FullName))
                        return a;
                }
                catch (BadImageFormatException) 
                {
                } 
            } 

            // Look in the GAC.  It may not be there, so we need to catch 
            // FileNotFoundException.
            // As an optimization, don't probe in the GAC if the public
            // key token is null, because by definition the assembly
            // can't be in the GAC. 
            if (!assemblyRef.Contains("PublicKeyToken=null"))
            { 
                try 
                {
                        return Assembly.ReflectionOnlyLoad(assemblyRef); 
                }
                catch (FileNotFoundException) {}

                try 
                {
                    // As a final effort, look in the GAC after appying loader policy. 
                    // This lets us resolves references for assemblies built against an older version of the framework. 
                    return Assembly.ReflectionOnlyLoad(AppDomain.CurrentDomain.ApplyPolicy(assemblyRef));
                } 
                catch (FileNotFoundException) {}
            }

            //Console.WriteLine("Couldn't resolve assembly {0} while loading a {1}", simpleName, _currentComponentType); 
            return null;
        } 
 
        // Note that Inspect sets state around for the assembly resolve event in a way that isn't currently threadsafe.
        //  
        // 
        // 
        // 
        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Maintainability", "CA1506:AvoidExcessiveClassCoupling"), 
         System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Security", "CA2122:DoNotIndirectlyExposeMethodsWithLinkDemands", Justification = "Reviewed"),
         System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1031:DoNotCatchGeneralExceptionTypes"), 
         System.Diagnostics.CodeAnalysis.SuppressMessage ("Microsoft.Security", "CA2103:ReviewImperativeSecurity")] 
        [System.Security.SecuritySafeCritical]
        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Security", "CA2128:SecurityTransparentCodeShouldNotAssert", Justification = "This is a SecurityRules.Level1 assembly, in which this rule is being incorrectly applied")] 
        internal InspectionResults Inspect(PipelineComponentType componentType, string assemblyFileName, string pipelineRootDirectory)
        {
            System.Diagnostics.Contracts.Contract.Requires(assemblyFileName != null);
            System.Diagnostics.Contracts.Contract.Requires(pipelineRootDirectory != null); 

            _assemblyFileName = assemblyFileName; 
            _pipelineRootDirectory = pipelineRootDirectory; 

            // Set up the assembly resolve event. 
            _currentComponentType = componentType;
            ResolveEventHandler assemblyResolver = new ResolveEventHandler(ResolveAssembly);
            AppDomain.CurrentDomain.ReflectionOnlyAssemblyResolve += assemblyResolver;
 
            InspectionResults retval = new InspectionResults();
            retval.Components = new List(); 
            retval.Warnings = new Collection(); 
            Type[] publicTypes;
            String assemblyName = null; 

            // Need to assert again here because we are in a new appdomain
            FileIOPermission permission = new FileIOPermission(FileIOPermissionAccess.PathDiscovery |
                    FileIOPermissionAccess.Read, _pipelineRootDirectory); 
            permission.Assert();
 
            try 
            {
                // We want to load the assembly WITHOUT REGARD OF PUBLISHER POLICY. 
                // If the directory structure contains v1.0 of a component and v1.1
                // exists in the GAC and is a security fix to v1.0, we still want to
                // inspect v1.0.  (The reason is we have other parts of the
                // pipeline that were likely compiled against v1.0, not v1.1, and 
                // we do type comparisons by comparing the fully qualified assembly
                // name.)  LoadFrom unfortunately respects policy.  Assembly's 
                // ReflectionOnlyLoad(byte[]) doesn't.  ReflectionOnlyLoadFrom(String) 
                // does respect policy if you've set DEVPATH, but only as a bug.
                // We don't think setting DEVPATH is interesting. 
                Assembly a = Assembly.ReflectionOnlyLoadFrom(_assemblyFileName);
                publicTypes = a.GetTypes();
                assemblyName = a.FullName;
            } 
            catch (FileNotFoundException fnf)
            { 
                retval.Warnings.Add(String.Format(CultureInfo.CurrentCulture, Res.AssemblyLoadFileNotFound, fnf.Message, fnf.FileName)); 
                return retval;
            } 
            catch (Exception e)
            {
                retval.Warnings.Add(String.Format(CultureInfo.CurrentCulture, Res.AssemblyLoadThrew, e.GetType().Name, e.Message, _assemblyFileName));
                return retval; 
            }
            PipelineComponent component = null; 
 
            String relativeFileName = Utils.MakeRelativePath(_assemblyFileName, _pipelineRootDirectory);
            Type lastType = null; 
            try
            {
                // Iterate over public types, looking for the appropriate custom attributes.
                foreach (Type type in publicTypes) 
                {
                    component = null; 
                    lastType = type; 
                    switch (componentType)
                    { 
                        case PipelineComponentType.Contract:
                            if (!Utils.HasCustomAttribute(PipelineComponent.ContractAttributeInReflectionLoaderContext, type))
                                continue;
 
                            component = new ContractComponent(new TypeInfo(type), relativeFileName);
                            break; 
 
                        case PipelineComponentType.AddInAdapter:
                            if (!Utils.HasCustomAttribute(PipelineComponent.AddInAdapterAttributeInReflectionLoaderContext, type)) 
                                continue;

                            component = new AddInAdapter(new TypeInfo(type), relativeFileName);
                            break; 

                        case PipelineComponentType.AddInBase: 
                            if (Utils.HasCustomAttribute(PipelineComponent.AddInAttributeInReflectionLoaderContext, type)) 
                                retval.Warnings.Add(String.Format(CultureInfo.CurrentCulture, Res.AddInInAddInViewFolder, type.Name, _assemblyFileName));
 
                            if (!Utils.HasCustomAttribute(PipelineComponent.AddInBaseAttributeInReflectionLoaderContext, type))
                                continue;

                            TypeInfo[] activatableAs = null; 
                            CustomAttributeData cad = Utils.GetCustomAttributeData(PipelineComponent.AddInBaseAttributeInReflectionLoaderContext, type);
                            foreach(CustomAttributeNamedArgument cana in cad.NamedArguments) 
                            { 
                                if (cana.MemberInfo.Name == "ActivatableAs")
                                { 
                                    CustomAttributeTypedArgument arg = cana.TypedValue;
                                    ReadOnlyCollection types = (ReadOnlyCollection)arg.Value;
                                    activatableAs = new TypeInfo[types.Count];
                                    int i = 0; 
                                    foreach (CustomAttributeTypedArgument subArg in types)
                                    { 
                                        activatableAs[i++] = new TypeInfo((Type)subArg.Value); 
                                    }
                                } 
                            }

                            component = new AddInBase(new TypeInfo(type), activatableAs, relativeFileName, assemblyName);
 
                            break;
 
                        default: 
                            System.Diagnostics.Contracts.Contract.Assert(false, "Fell through switch - unrecognized componentType in InspectionWorker.Inspect");
                            break; 
                    }  // switch

                    // If we found a component, make sure it satisfies all of its constraints, and give our
                    // PipelineComponents a chance to initialize state. 
                    if (component != null)
                    { 
                        if (component.Validate(type, retval.Warnings)) 
                            retval.Components.Add(component);
                    } 
                } // foreach type in the assembly
            } // try
            catch (FileNotFoundException fnf)
            { 
                retval.Warnings.Add(String.Format(CultureInfo.CurrentCulture, Res.AssemblyLoadFileNotFound, fnf.Message, fnf.FileName));
                return retval; 
            } 
            catch (NotImplementedException)
            { 
                retval.Warnings.Add(String.Format(CultureInfo.CurrentCulture, Res.NotImplementedFeatureBadCtorParamOrAssembly,
                    _assemblyFileName, (lastType == null) ? "" : lastType.FullName));
                return retval;
            } 
            catch (Exception e)
            { 
                retval.Warnings.Add(String.Format(CultureInfo.CurrentCulture, Res.InspectingAssemblyThrew, e.GetType().Name, e.Message, _assemblyFileName)); 
                return retval;
            } 

            AppDomain.CurrentDomain.ReflectionOnlyAssemblyResolve -= assemblyResolver;

            if (retval.Components.Count == 0 && _currentComponentType != PipelineComponentType.AddIn && _currentComponentType != PipelineComponentType.AddInBase) 
            {
                retval.Warnings.Add(String.Format(CultureInfo.CurrentCulture, Res.NoAddInModelPartsFound, componentType, _assemblyFileName)); 
            } 
#if ADDIN_VERBOSE_WARNINGS
            foreach (PipelineComponent c in retval.Components) 
                retval.Warnings.Add(String.Format(CultureInfo.CurrentCulture, "Found a {0}.  Name: {1}  Assembly: {2}", componentType, c.SimpleName, c.AssemblySimpleName));
#endif
            return retval;
        } 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.

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