Add missing request.c

Fixes https://github.com/emersion/xdg-desktop-portal-wlr/issues/3

request.c

@@ -0,0 +1,43 @@
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "xdpw.h"
+
+static const char interface_name[] = "org.freedesktop.impl.portal.Request";
+
+static int method_close(sd_bus_message *msg, void *data,
+		sd_bus_error *ret_error) {
+	// struct xdpw_request *req = data;
+	// TODO
+	printf("Request.Close\n");
+	return 0;
+}
+
+static const sd_bus_vtable request_vtable[] = {
+	SD_BUS_VTABLE_START(0),
+	SD_BUS_METHOD("Close", "", "", method_close, SD_BUS_VTABLE_UNPRIVILEGED),
+	SD_BUS_VTABLE_END
+};
+
+struct xdpw_request *request_create(sd_bus *bus, const char *object_path) {
+	struct xdpw_request *req = calloc(1, sizeof(struct xdpw_request));
+
+	if (sd_bus_add_object_vtable(bus, &req->slot, object_path, interface_name,
+			request_vtable, NULL) < 0) {
+		free(req);
+		fprintf(stderr, "sd_bus_add_object_vtable failed: %s\n",
+			strerror(-errno));
+		return NULL;
+	}
+
+	return req;
+}
+
+void request_destroy(struct xdpw_request *req) {
+	if (req == NULL) {
+		return;
+	}
+	sd_bus_slot_unref(req->slot);
+	free(req);
+}