/// <summary>
/// Gets the active software license.
/// </summary>
/// <returns>
/// The most applicable software license.
/// </returns>
public LocalLicenseModel GetCurrent()
{
if (_license == null)
{
_license = this.Provider.Security.License.FetchAll().OrderBy(license =>
license.Status == LicenseStatus.OK ? 1 :
license.Status == LicenseStatus.Invalid ? 2 :
license.Status == LicenseStatus.Expired ? 3 :
license.Status == LicenseStatus.Inactive ? 4 :
license.Status == LicenseStatus.Revoked ? 5 : 6
).FirstOrDefault();
}
return(_license);
}
/// <summary>
/// Constructs a hashable object of the specified license.
/// </summary>
private static Dictionary <String, Object> ConstructDefinition(LocalLicenseModel model)
{
// Get the database-persisted non-selectable modules, plus the instance-persisted selectable modules.
List <LicenseModules> modules = new List <LicenseModules>();
modules.AddRange(model.Provider.Security.LicenseModule.FetchAllByLicenseId(model.Id).Select(licmod => licmod.Module).Where(mod => !IsSelectableModule(mod)));
modules.AddRange(model.Modules.Where(mod => mod.Enabled).Select(mod => mod.Module));
Dictionary <String, Object> definition = new Dictionary <String, Object>();
definition.Add("Active", model.Active.ToString("yyyy-MM-dd"));
definition.Add("Expiry", model.Expiry == null ? null : model.Expiry.Value.ToString("yyyy-MM-dd"));
definition.Add("Limits", model.Limits.Select(LocalLicenseModel.ConstructDefinition));
definition.Add("Modules", modules.Select(module => module.ConvertTo <Guid>()));
return(definition);
}
/// <summary>
/// Computes an SHA-512 cryptographic hash from the protected data held on the license.
/// </summary>
/// <returns>
/// An SHA-512 cryptographic hash which can be used to verify or sign the license.
/// </returns>
private Byte[] ComputeHash()
{
Byte[] hash;
// Serialize the license information into a JSON object.
JavaScriptSerializer serializer = new JavaScriptSerializer();
Object objectDefinition = LocalLicenseModel.ConstructDefinition(this);
String stringDefinition = serializer.Serialize(objectDefinition);
Byte[] binaryDefinition = Encoding.ASCII.GetBytes(stringDefinition);
// Compute a SHA-512 hash from the JSON object
using (SHA512 hashAlgorithm = SHA512.Create())
hash = hashAlgorithm.ComputeHash(binaryDefinition);
return(hash);
}
/// <summary>
/// Executes after this <see cref="LocalLicenseModel"/> has been saved and is used to save the modules that have been selected/deselected.
/// </summary>
protected override void ResolveDependent()
{
base.ResolveDependent();
if (_modules != null)
{
// Delete any modules that were enabled in the database but are no longer enabled in this License instance.
LocalLicenseModuleModel[] dbModules = this.Provider.Security.LicenseModule.FetchAllByLicenseId(this.Id).Where(licmod => LocalLicenseModel.IsSelectableModule(licmod.Module) && !this.Modules.Any(mod => mod.Module == licmod.Module && mod.Enabled)).ToArray();
dbModules.Execute(licmod => licmod.Delete());
// Create new database modules for modules which are now enabled
LicenseModules[] enabledModules = this.Modules.Where(mod => LocalLicenseModel.IsSelectableModule(mod.Module) && mod.Enabled && !dbModules.Any(licmod => mod.Module == licmod.Module)).Select(mod => mod.Module).ToArray();
foreach (LicenseModules module in enabledModules)
{
LocalLicenseModuleModel newEntry = this.Provider.Security.LicenseModule.Create();
newEntry.License = this.Id;
newEntry.Module = module;
newEntry.Save();
}
}
}
/// <summary>
/// Clears the cached license from memory so that the updated license can be reloaded and recached.
/// </summary>
internal void Reset()
{
_license = null;
}