Add D-Bus boilerplate for Screenshot

include/xdpw.h

@@ -4,6 +4,13 @@
 #include <wayland-client.h>
 #include <systemd/sd-bus.h>
 
+struct xdpw_request {
+	sd_bus_slot *slot;
+};
+
 int init_screenshot(sd_bus *bus);
 
+struct xdpw_request *request_create(sd_bus *bus, const char *object_path);
+void request_destroy(struct xdpw_request *req);
+
 #endif

meson.build

@@ -25,6 +25,7 @@ executable(
 	'xdg-desktop-portal-wlr',
 	files([
 		'main.c',
+		'request.c',
 		'screenshot.c',
 	]),
 	dependencies: [

screenshot.c

@@ -1,5 +1,6 @@
-#include <stdlib.h>
+#include <errno.h>
 #include <stdio.h>
+#include <stdlib.h>
 #include "xdpw.h"
 
 static const char object_path[] = "/org/freedesktop/portal/desktop";
@@ -7,8 +8,80 @@ static const char interface_name[] = "org.freedesktop.impl.portal.Screenshot";
 
 static int method_screenshot(sd_bus_message *msg, void *data,
 		sd_bus_error *ret_error) {
-	// TODO
-	printf("Screenshot\n");
+	int ret = 0;
+
+	char *handle, *app_id, *parent_window;
+	ret = sd_bus_message_read(msg, "oss", &handle, &app_id, &parent_window);
+	if (ret < 0) {
+		return ret;
+	}
+	// TODO: read options
+
+	// TODO: cleanup this
+	struct xdpw_request *req =
+		request_create(sd_bus_message_get_bus(msg), handle);
+	if (req == NULL) {
+		return -ENOMEM;
+	}
+
+	sd_bus_message *reply = NULL;
+	ret = sd_bus_message_new_method_return(msg, &reply);
+	if (ret < 0) {
+		return ret;
+	}
+
+	ret = sd_bus_message_append(reply, "u", 0);
+	if (ret < 0) {
+		return ret;
+	}
+
+	ret = sd_bus_message_open_container(reply, 'a', "{sv}");
+	if (ret < 0) {
+		return ret;
+	}
+
+	ret = sd_bus_message_open_container(reply, 'e', "sv");
+	if (ret < 0) {
+		return ret;
+	}
+
+	ret = sd_bus_message_append_basic(reply, 's', "uri");
+	if (ret < 0) {
+		return ret;
+	}
+
+	ret = sd_bus_message_open_container(reply, 'v', "s");
+	if (ret < 0) {
+		return ret;
+	}
+
+	// TODO: take an actual screenshot
+	ret = sd_bus_message_append_basic(reply, 's', "file:///tmp/out.png");
+	if (ret < 0) {
+		return ret;
+	}
+
+	ret = sd_bus_message_close_container(reply);
+	if (ret < 0) {
+		return ret;
+	}
+
+	ret = sd_bus_message_close_container(reply);
+	if (ret < 0) {
+		return ret;
+	}
+
+	ret = sd_bus_message_close_container(reply);
+	if (ret < 0) {
+		return ret;
+	}
+
+	ret = sd_bus_send(NULL, reply, NULL);
+	if (ret < 0) {
+		return ret;
+	}
+
+	sd_bus_message_unref(reply);
 	return 0;
 }