Cassette per-site cache directory

CassetteSettings.cs

/// <summary>
/// Handles custom configuration of Cassette
/// </summary>
public class CassetteSettings : IConfiguration<Cassette.CassetteSettings>
{
	/// <summary>
	/// Base cache path
	/// </summary>
	private const string CACHE_BASE_PATH = @"c:\temp\Cassette\";

	/// <summary>
	/// Configures Cassette's settings
	/// </summary>
	/// <param name="settings">The settings.</param>
	public void Configure(Cassette.CassetteSettings settings)
	{
		settings.CacheDirectory = new FileSystemDirectory(GenerateUniquePerSiteCacheDirectory());
	}

	/// <summary>
	/// Generate a cache directory name unique to this website.
	/// </summary>
	/// <returns>Cache directory name</returns>
	private static string GenerateUniquePerSiteCacheDirectory()
	{
		// Application ID is something like "/LM/W3SVC/2000/ROOT/Trunk/PageUpPeople"
		// This is unique per application in IIS. Use a hash of it for the cache path
		string hashedAppId;
		using (var hasher = SHA1.Create())
		{
			var bytes = hasher.ComputeHash(Encoding.Default.GetBytes(HostingEnvironment.ApplicationID));
			hashedAppId = BitConverter.ToString(bytes).Replace("-", string.Empty);
		}

		return Path.Combine(CACHE_BASE_PATH, hashedAppId);
	}
}