res/res_stasis: Fixed wrong StasisEnd timestamp

Because StasisEnd's timestamp created it's own timestamp, it makes
wrong timestamp, compare to other channel event(ChannelDestroyed).
Fixed to getting a timestamp from the Channel's timestamp.

ASTERISK-28333

Change-Id: I5eb8380fc472f1100535a6bc4983c64767026116

res/res_stasis.c

@@ -118,16 +118,23 @@ static struct ast_json *stasis_end_to_json(struct stasis_message *message,
 		const struct stasis_message_sanitizer *sanitize)
 {
 	struct ast_channel_blob *payload = stasis_message_data(message);
+	struct ast_json *msg;
 
 	if (sanitize && sanitize->channel_snapshot &&
 			sanitize->channel_snapshot(payload->snapshot)) {
 		return NULL;
 	}
 
-	return ast_json_pack("{s: s, s: o, s: o}",
+	msg = ast_json_pack("{s: s, s: o, s: o}",
 		"type", "StasisEnd",
-		"timestamp", ast_json_timeval(ast_tvnow(), NULL),
+		"timestamp", ast_json_copy(ast_json_object_get(payload->blob, "timestamp")),
 		"channel", ast_channel_snapshot_to_json(payload->snapshot, sanitize));
+	if (!msg) {
+		ast_log(LOG_ERROR, "Failed to pack JSON for StasisEnd message\n");
+		return NULL;
+	}
+
+	return msg;
 }
 
 STASIS_MESSAGE_TYPE_DEFN_LOCAL(end_message_type,
@@ -1034,7 +1041,10 @@ int app_send_end_msg(struct stasis_app *app, struct ast_channel *chan)
 		return 0;
 	}
 
-	blob = ast_json_pack("{s: s}", "app", stasis_app_name(app));
+	blob = ast_json_pack("{s: s, s: o}",
+		"app", stasis_app_name(app),
+		"timestamp", ast_json_timeval(ast_tvnow(), NULL)
+		);
 	if (!blob) {
 		ast_log(LOG_ERROR, "Error packing JSON for StasisEnd message\n");
 		return -1;