rtmp-services: Add format_version to services.json

The entire services file had to be restructured, but this allows us to
be able to change the format of the json file safely (if ever needed).

plugins/rtmp-services/CMakeLists.txt

@@ -7,6 +7,9 @@ set(rtmp-services_SOURCES
 	rtmp-custom.c
 	rtmp-services-main.c)
 
+set(rtmp-services_HEADERS
+	rtmp-format-ver.h)
+
 set(RTMP_SERVICES_URL
 	"https://obsproject.com/obs2_update/rtmp-services"
 	CACHE STRING "Default services package URL")
@@ -20,6 +23,7 @@ set(rtmp-services_config_HEADERS
 
 add_library(rtmp-services MODULE
 	${rtmp-services_SOURCES}
+	${rtmp-services_HEADERS}
 	${rtmp-services_config_HEADERS})
 target_link_libraries(rtmp-services
 	libobs

plugins/rtmp-services/rtmp-common.c

@@ -2,6 +2,8 @@
 #include <obs-module.h>
 #include <jansson.h>
 
+#include "rtmp-format-ver.h"
+
 struct rtmp_common {
 	char *service;
 	char *server;
@@ -129,6 +131,8 @@ static json_t *open_json_file(const char *file)
 	char         *file_data = os_quick_read_utf8_file(file);
 	json_error_t error;
 	json_t       *root;
+	json_t       *list;
+	int          format_ver;
 
 	if (!file_data)
 		return NULL;
@@ -143,7 +147,28 @@ static json_t *open_json_file(const char *file)
 		return NULL;
 	}
 
-	return root;
+	format_ver = get_int_val(root, "format_version");
+
+	if (format_ver != RTMP_SERVICES_FORMAT_VERSION) {
+		blog(LOG_WARNING, "rtmp-common.c: [open_json_file] "
+		                  "Wrong format version (%d), expected %d",
+				  format_ver, RTMP_SERVICES_FORMAT_VERSION);
+		json_decref(root);
+		return NULL;
+	}
+
+	list = json_object_get(root, "services");
+	if (list)
+		json_incref(list);
+	json_decref(root);
+
+	if (!list) {
+		blog(LOG_WARNING, "rtmp-common.c: [open_json_file] "
+		                  "No services list");
+		return NULL;
+	}
+
+	return list;
 }
 
 static void build_service_list(obs_property_t *list, json_t *root,

plugins/rtmp-services/rtmp-format-ver.h

+#pragma once
+
+#define RTMP_SERVICES_FORMAT_VERSION 1