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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.Core.WindowsInstaller.Bind
{
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using WixToolset.Core.Cab;
using WixToolset.Core.Bind;
using WixToolset.Data;
using WixToolset.Extensibility;
public class CabinetResolver
{
public CabinetResolver(string cabCachePath, IEnumerable<IWindowsInstallerBackendExtension> backendExtensions)
{
this.CabCachePath = cabCachePath;
this.BackendExtensions = backendExtensions;
}
private string CabCachePath { get; }
private IEnumerable<IWindowsInstallerBackendExtension> BackendExtensions { get; }
public ResolvedCabinet ResolveCabinet(string cabinetPath, IEnumerable<FileFacade> fileFacades)
{
var filesWithPath = fileFacades.Select(f => new BindFileWithPath() { Id = f.File.File, Path = f.WixFile.Source }).ToList();
ResolvedCabinet resolved = null;
foreach (var extension in this.BackendExtensions)
{
resolved = extension.ResolveCabinet(cabinetPath, filesWithPath);
if (null != resolved)
{
return resolved;
}
}
// By default cabinet should be built and moved to the suggested location.
resolved = new ResolvedCabinet() { BuildOption = CabinetBuildOption.BuildAndMove, Path = cabinetPath };
// If a cabinet cache path was provided, change the location for the cabinet
// to be built to and check if there is a cabinet that can be reused.
if (!String.IsNullOrEmpty(this.CabCachePath))
{
string cabinetName = Path.GetFileName(cabinetPath);
resolved.Path = Path.Combine(this.CabCachePath, cabinetName);
if (CheckFileExists(resolved.Path))
{
// Assume that none of the following are true:
// 1. any files are added or removed
// 2. order of files changed or names changed
// 3. modified time changed
bool cabinetValid = true;
// Need to force garbage collection of WixEnumerateCab to ensure the handle
// associated with it is closed before it is reused.
using (var wixEnumerateCab = new WixEnumerateCab())
{
List<CabinetFileInfo> fileList = wixEnumerateCab.Enumerate(resolved.Path);
if (filesWithPath.Count() != fileList.Count)
{
cabinetValid = false;
}
else
{
int i = 0;
foreach (BindFileWithPath file in filesWithPath)
{
// First check that the file identifiers match because that is quick and easy.
CabinetFileInfo cabFileInfo = fileList[i];
cabinetValid = (cabFileInfo.FileId == file.Id);
if (cabinetValid)
{
// Still valid so ensure the file sizes are the same.
FileInfo fileInfo = new FileInfo(file.Path);
cabinetValid = (cabFileInfo.Size == fileInfo.Length);
if (cabinetValid)
{
// Still valid so ensure the source time stamp hasn't changed. Thus we need
// to convert the source file time stamp into a cabinet compatible data/time.
Native.CabInterop.DateTimeToCabDateAndTime(fileInfo.LastWriteTime, out var sourceCabDate, out var sourceCabTime);
cabinetValid = (cabFileInfo.Date == sourceCabDate && cabFileInfo.Time == sourceCabTime);
}
}
if (!cabinetValid)
{
break;
}
i++;
}
}
}
resolved.BuildOption = cabinetValid ? CabinetBuildOption.Copy : CabinetBuildOption.BuildAndCopy;
}
}
return resolved;
}
private static bool CheckFileExists(string path)
{
try
{
return File.Exists(path);
}
catch (ArgumentException)
{
throw new WixException(WixErrors.IllegalCharactersInPath(path));
}
}
}
}
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