feat: remove webhook subcription by url (#194)

* feat: added webhook unsubscription
* test: adding unsubscribe tests

notifications/server.go

@@ -82,3 +82,59 @@ func (s *server) SubscribeNotifications(
 	log.Printf("%v was successfully registered for notifications on url %s", pubkey, request.Url)
 	return &SubscribeNotificationsReply{}, nil
 }
+
+func (s *server) UnsubscribeNotifications(
+	ctx context.Context,
+	in *EncryptedNotificationRequest,
+) (*UnsubscribeNotificationsReply, error) {
+	node, _, err := lspdrpc.GetNode(ctx)
+	if err != nil {
+		return nil, err
+	}
+
+	data, err := ecies.Decrypt(node.EciesPrivateKey, in.Blob)
+	if err != nil {
+		log.Printf(
+			"failed to unsubscribe: ecies.Decrypt error: %v",
+			err,
+		)
+		return nil, fmt.Errorf("ecies.Decrypt(%x) error: %w", in.Blob, err)
+	}
+
+	var request UnsubscribeNotificationsRequest
+	err = proto.Unmarshal(data, &request)
+	if err != nil {
+		log.Printf(
+			"failed to unsubscribe: proto.Unmarshal(%x) error: %v",
+			data,
+			err,
+		)
+		return nil, fmt.Errorf("proto.Unmarshal(%x) error: %w", data, err)
+	}
+
+	pubkey, err := lightning.VerifyMessage([]byte(request.Url), request.Signature)
+	if err != nil {
+		log.Printf(
+			"failed to unsubscribe on url %s: lightning.VerifyMessage error: %v",
+			request.Url,
+			err,
+		)
+
+		return nil, err
+	}
+
+	err = s.store.Unsubscribe(ctx, hex.EncodeToString(pubkey.SerializeCompressed()), request.Url)
+
+	if err != nil {
+		log.Printf(
+			"failed to unsubscribe %x on url %s: %v",
+			pubkey.SerializeCompressed(),
+			request.Url,
+			err,
+		)
+
+		return nil, ErrInternal
+	}
+
+	return &UnsubscribeNotificationsReply{}, nil
+}