public bool TryGetPayloadFromCache(string packageId, string packageVersion, out MsiPayload payload)
{
string packageCacheDirectory = GetPackageDirectory(packageId, packageVersion);
string manifestPath = Path.Combine(packageCacheDirectory, "msi.json");
payload = default;
// It's possible that the MSI is cached, but without the JSON manifest we cannot
// trust that the MSI in the cache directory is the correct file.
if (!File.Exists(manifestPath))
{
Log?.LogMessage($"Manifest file does not exist, '{manifestPath}'");
return(false);
}
// The msi.json manifest contains the name of the actual MSI. The filename does not necessarily match the package
// ID as it may have been shortened to support VS caching.
MsiManifest msiManifest = JsonConvert.DeserializeObject <MsiManifest>(File.ReadAllText(manifestPath));
string msiPath = Path.Combine(Path.GetDirectoryName(manifestPath), msiManifest.Payload);
if (!File.Exists(msiPath))
{
Log?.LogMessage($"MSI package is not cached, '{msiPath}'");
return(false);
}
payload = new MsiPayload(manifestPath, msiPath);
return(true);
}
public void CachePayload(string packageId, string packageVersion, string manifestPath)
{
if (!File.Exists(manifestPath))
{
throw new FileNotFoundException($"Manifest file not found: {manifestPath}");
}
Elevate();
if (IsElevated)
{
CreateRootDirectory();
string packageDirectory = GetPackageDirectory(packageId, packageVersion);
// Delete the directory and create a new one that's secure. If the files were properly
// cached, the client won't request this action.
if (Directory.Exists(packageDirectory))
{
Directory.Delete(packageDirectory, recursive: true);
}
CreateSecureDirectory(packageDirectory);
// We cannot assume that the MSI adjacent to the manifest is the one to cache. We'll trust
// the manifest to provide the MSI filename.
MsiManifest msiManifest = JsonConvert.DeserializeObject <MsiManifest>(File.ReadAllText(manifestPath));
// Only use the filename+extension of the payload property in case the manifest has been altered.
string msiPath = Path.Combine(Path.GetDirectoryName(manifestPath), Path.GetFileName(msiManifest.Payload));
string cachedMsiPath = Path.Combine(packageDirectory, Path.GetFileName(msiPath));
string cachedManifestPath = Path.Combine(packageDirectory, Path.GetFileName(manifestPath));
MoveFile(manifestPath, cachedManifestPath);
MoveFile(msiPath, cachedMsiPath);
}
else if (IsClient)
{
Dispatcher.SendCacheRequest(InstallRequestType.CachePayload, manifestPath, packageId, packageVersion);
}
}