拡張機能を作成しました。それを改善するためのコメントをいただければ幸いです。
public static class ZipArchiveExtensions
{
public static void ExtractToDirectory(this ZipArchive archive, string destinationDirectoryName, bool overwrite)
{
if (!overwrite)
{
archive.ExtractToDirectory(destinationDirectoryName);
return;
}
DirectoryInfo di = Directory.CreateDirectory(destinationDirectoryName);
string destinationDirectoryFullPath = di.FullName;
foreach (ZipArchiveEntry file in archive.Entries)
{
string completeFileName = Path.GetFullPath(Path.Combine(destinationDirectoryFullPath, file.FullName));
if (!completeFileName.StartsWith(destinationDirectoryFullPath, StringComparison.OrdinalIgnoreCase))
{
throw new IOException("Trying to extract file outside of destination directory. See this link for more info: https://snyk.io/research/zip-slip-vulnerability");
}
if (file.Name == "")
{// Assuming Empty for Directory
Directory.CreateDirectory(Path.GetDirectoryName(completeFileName));
continue;
}
file.ExtractToFile(completeFileName, true);
}
}
}