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// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
namespace WixToolset.Mba.Host
{
using System;
using System.Configuration;
using System.Reflection;
using System.Runtime.InteropServices;
using WixToolset.Mba.Core;
/// <summary>
/// Entry point for the managed host to create and return the BA to the engine.
/// </summary>
[ClassInterface(ClassInterfaceType.None)]
public sealed class BootstrapperApplicationFactory : MarshalByRefObject, IBootstrapperApplicationFactory
{
/// <summary>
/// Creates a new instance of the <see cref="BootstrapperApplicationFactory"/> class.
/// Entry point for the MBA host.
/// </summary>
public BootstrapperApplicationFactory()
{
}
/// <summary>
/// Loads the bootstrapper application assembly and calls its IBootstrapperApplicationFactory.Create method.
/// </summary>
/// <param name="pArgs">Pointer to BOOTSTRAPPER_CREATE_ARGS struct.</param>
/// <param name="pResults">Pointer to BOOTSTRAPPER_CREATE_RESULTS struct.</param>
/// <exception cref="MissingAttributeException">The bootstrapper application assembly
/// does not define the <see cref="BootstrapperApplicationFactoryAttribute"/>.</exception>
public void Create(IntPtr pArgs, IntPtr pResults)
{
// Get the wix.boostrapper section group to get the name of the bootstrapper application assembly to host.
var section = ConfigurationManager.GetSection("wix.bootstrapper/host") as HostSection;
if (null == section)
{
throw new MissingAttributeException(); // TODO: throw a more specific exception than this.
}
// Load the BA's IBootstrapperApplicationFactory.
var baFactoryType = BootstrapperApplicationFactory.GetBAFactoryTypeFromAssembly(section.AssemblyName);
var baFactory = (IBootstrapperApplicationFactory)Activator.CreateInstance(baFactoryType);
if (null == baFactory)
{
throw new InvalidBootstrapperApplicationFactoryException();
}
baFactory.Create(pArgs, pResults);
}
/// <summary>
/// Locates the <see cref="BootstrapperApplicationFactoryAttribute"/> and returns the specified type.
/// </summary>
/// <param name="assemblyName">The assembly that defines the IBootstrapperApplicationFactory implementation.</param>
/// <returns>The bootstrapper application factory <see cref="Type"/>.</returns>
private static Type GetBAFactoryTypeFromAssembly(string assemblyName)
{
Type baFactoryType = null;
// Load the requested assembly.
Assembly asm = AppDomain.CurrentDomain.Load(assemblyName);
// If an assembly was loaded and is not the current assembly, check for the required attribute.
// This is done to avoid using the BootstrapperApplicationFactoryAttribute which we use at build time
// to specify the BootstrapperApplicationFactory assembly in the manifest.
if (!Assembly.GetExecutingAssembly().Equals(asm))
{
// There must be one and only one BootstrapperApplicationFactoryAttribute.
// The attribute prevents multiple declarations already.
var attrs = (BootstrapperApplicationFactoryAttribute[])asm.GetCustomAttributes(typeof(BootstrapperApplicationFactoryAttribute), false);
if (null != attrs)
{
baFactoryType = attrs[0].BootstrapperApplicationFactoryType;
}
}
if (null == baFactoryType)
{
throw new MissingAttributeException();
}
return baFactoryType;
}
}
}
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