rtmp-services: Automatically update services.json

Uses the file-updater utility library to update the services.json file.
If the remote version is incompatible or corrupted, will reject the
file.

plugins/rtmp-services/CMakeLists.txt

@@ -27,6 +27,7 @@ add_library(rtmp-services MODULE
 	${rtmp-services_config_HEADERS})
 target_link_libraries(rtmp-services
 	libobs
+	file-updater
 	${OBS_JANSSON_IMPORT})
 
 target_include_directories(rtmp-services

plugins/rtmp-services/data/package.json

+{
+	"url": "https://obsproject.com/obs2_update/rtmp-services",
+	"version": 1,
+	"files": [
+		{
+			"name": "services.json",
+			"version": 1
+		}
+	]
+}

plugins/rtmp-services/rtmp-services-main.c

 #include <util/text-lookup.h>
+#include <util/threading.h>
+#include <util/platform.h>
 #include <util/dstr.h>
 #include <obs-module.h>
+#include <file-updater/file-updater.h>
+
+#include "rtmp-format-ver.h"
+#include "lookup-config.h"
 
 OBS_DECLARE_MODULE()
 OBS_MODULE_USE_DEFAULT_LOCALE("rtmp-services", "en-US")
 
+#define RTMP_SERVICES_LOG_STR "[rtmp-services plugin] "
+#define RTMP_SERVICES_VER_STR "rtmp-services plugin (libobs " OBS_VERSION ")"
+
 extern struct obs_service_info rtmp_common_service;
 extern struct obs_service_info rtmp_custom_service;
 
+static update_info_t *update_info = NULL;
+
+static bool confirm_service_file(void *param, struct file_download_data *file)
+{
+	if (astrcmpi(file->name, "services.json") == 0) {
+		obs_data_t *data;
+		int format_version;
+
+		data = obs_data_create_from_json(file->buffer.array);
+		if (!data)
+			return false;
+
+		format_version = obs_data_get_int(data, "format_version");
+		obs_data_release(data);
+
+		if (format_version != RTMP_SERVICES_FORMAT_VERSION)
+			return false;
+	}
+
+	UNUSED_PARAMETER(param);
+	return true;
+}
+
 bool obs_module_load(void)
 {
+	char *local_dir = obs_module_file("");
+	char *cache_dir = obs_module_config_path("");
+
+	if (cache_dir) {
+		update_info = update_info_create(
+				RTMP_SERVICES_LOG_STR,
+				RTMP_SERVICES_VER_STR,
+				RTMP_SERVICES_URL,
+				local_dir,
+				cache_dir,
+				confirm_service_file, NULL);
+	}
+
+	bfree(local_dir);
+	bfree(cache_dir);
+
 	obs_register_service(&rtmp_common_service);
 	obs_register_service(&rtmp_custom_service);
 	return true;
 }
+
+void obs_module_unload(void)
+{
+	update_info_destroy(update_info);
+}