Experiment with PGP signed messages

source/net/filebot/License.java

@@ -34,21 +34,23 @@ public class License implements Serializable {
 	private long id;
 	private long expires;
 
-	public License(byte[] bytes) throws Exception {
+	private Exception error;
+
+	public License(byte[] bytes) {
 		this.bytes = bytes;
 
-		// verify and get clear signed content
-		Map<String, String> properties = getProperties();
+		try {
+			// verify and get clear signed content
+			Map<String, String> properties = getProperties();
 
-		this.id = Long.parseLong(properties.get("Order"));
-		this.expires = LocalDate.parse(properties.get("Valid-Until"), DateTimeFormatter.ISO_LOCAL_DATE).atStartOfDay(ZoneOffset.UTC).plusDays(1).minusSeconds(1).toInstant().toEpochMilli();
+			this.id = Long.parseLong(properties.get("Order"));
+			this.expires = LocalDate.parse(properties.get("Valid-Until"), DateTimeFormatter.ISO_LOCAL_DATE).atStartOfDay(ZoneOffset.UTC).plusDays(1).minusSeconds(1).toInstant().toEpochMilli();
 
-		// verify license online
-		verifyLicense();
-	}
-
-	public boolean expired() {
-		return expires > System.currentTimeMillis();
+			// verify license online
+			verifyLicense();
+		} catch (Exception e) {
+			error = e;
+		}
 	}
 
 	public Map<String, String> getProperties() throws Exception {
@@ -97,6 +99,16 @@ public class License implements Serializable {
 		}
 	}
 
+	public void check() throws Exception {
+		if (error != null) {
+			throw error;
+		}
+
+		if (expires > System.currentTimeMillis()) {
+			throw new IllegalStateException("Expired: " + toString());
+		}
+	}
+
 	@Override
 	public String toString() {
 		return String.format("%s (Valid-Until: %s)", id, Instant.ofEpochMilli(expires).atZone(ZoneOffset.UTC).format(DateTimeFormatter.ISO_LOCAL_DATE));

source/net/filebot/LicenseModel.java

@@ -8,7 +8,7 @@ import java.io.File;
 
 import net.filebot.util.SystemProperty;
 
-public enum LicenseType {
+public enum LicenseModel {
 
 	MicrosoftStore {
 
@@ -33,16 +33,12 @@ public enum LicenseType {
 	PGPSignedMessage {
 
 		public final SystemProperty<File> LICENSE_FILE = SystemProperty.of("net.filebot.license", File::new, ApplicationFolder.AppData.resolve("license.txt"));
-		public final Resource<License> LICENSE = Resource.lazy(() -> new License(readFile(LICENSE_FILE.get())));
+		public final MemoizedResource<License> LICENSE = Resource.lazy(() -> new License(readFile(LICENSE_FILE.get())));
 
 		@Override
 		public void check() throws LicenseError {
 			try {
-				License license = LICENSE.get();
-
-				if (license.expired()) {
-					throw new LicenseError("Expired: " + license);
-				}
+				LICENSE.get().check();
 			} catch (Exception e) {
 				throw new LicenseError(e.getMessage());
 			}
@@ -51,7 +47,7 @@ public enum LicenseType {
 
 	public abstract void check() throws LicenseError;
 
-	public static LicenseType get() {
+	public static LicenseModel get() {
 		if (isUWP())
 			return MicrosoftStore;
 		if (isMacSandbox())

source/net/filebot/Resource.java

@@ -7,7 +7,7 @@ public interface Resource<R> {
 
 	R get() throws Exception;
 
-	default Resource<R> memoize() {
+	default MemoizedResource<R> memoize() {
 		return new MemoizedResource<R>(this);
 	}
 
@@ -15,7 +15,7 @@ public interface Resource<R> {
 		return new TransformedResource<R, T>(this, function);
 	}
 
-	static <T> Resource<T> lazy(Resource<T> resource) {
+	static <T> MemoizedResource<T> lazy(Resource<T> resource) {
 		return resource.memoize();
 	}
 
@@ -37,6 +37,10 @@ class MemoizedResource<R> implements Resource<R> {
 		}
 		return value;
 	}
+
+	public synchronized void clear() {
+		value = null;
+	}
 }
 
 class TransformedResource<R, T> implements Resource<T> {