refactor(validation): return empty on insecure public key

client/src/main/java/dev/fitko/fitconnect/client/SenderClient.java

@@ -457,8 +457,9 @@ public final class SenderClient {
             final Destination destination = sender.getDestination(destinationId);
             final RSAKey encryptionKey = sender.getEncryptionKeyForDestination(destinationId, destination.getEncryptionKid());
             final ValidationResult validationResult = sender.validatePublicKey(encryptionKey);
-            if (validationResult.hasError()) {
-                LOGGER.error("Invalid public key: ", validationResult.getError());
+            if (validationResult.hasError() && !environment.isAllowInsecurePublicKey()) {
+                LOGGER.error("Invalid public key", validationResult.getError());
+                return Optional.empty();
             }
             return Optional.of(encryptionKey.toJSONString());
         }