fix: read file name from Content-Disposition header and override title bar

Author: Bentroen

scripts/control_create/control_create.gml

@@ -563,6 +563,7 @@ function control_create() {
 	song_total_size = -1
 	song_download_status = 0
 	song_download_file = ""
+	song_download_display_name = ""
 
 	// Delete old installer
 	if (file_exists_lib(update_file)) {
@@ -645,7 +646,7 @@ function control_create() {
 			song_download_file = filename_change_ext(downloaded_song_file, song_download_ext)
 
 			// Set displayed filename to the server's file name
-			filename = string_copy(download_url_noparams, string_last_pos("/", download_url_noparams), string_length(download_url_noparams));
+			song_download_display_name = string_copy(download_url_noparams, string_last_pos("/", download_url_noparams) + 1, string_length(download_url_noparams));
 
 			// Init download
 			song_download_data = http_get_file(download_url, song_download_file);	

scripts/control_draw/control_draw.gml

@@ -28,7 +28,7 @@ function control_draw() {
 	showmenu = 0
 	cursmarker = 0
 	compx = 160
-	window_set_caption(condstr((filename = "" || filename = "-player") && (midiname = "" || !isplayer), condstr(language != 1, "Unsaved song", "新文件")) + condstr(filename != "-player", filename_name(filename)) + condstr((filename = "" || filename = "-player") && midiname != "" && isplayer, midiname) + condstr(changed && filename != "" && filename != "-player", "*") + " - Minecraft Note Block Studio" + condstr(isplayer, " - Player Mode"))
+	window_set_caption(condstr((protocol_data != pointer_null), song_download_display_name, condstr((filename = "" || filename = "-player") && (midiname = "" || !isplayer), condstr(language != 1, "Unsaved song", "新文件")) + condstr(filename != "-player", filename_name(filename)) + condstr((filename = "" || filename = "-player") && midiname != "" && isplayer, midiname) + condstr(changed && filename != "" && filename != "-player", "*")) + " - Minecraft Note Block Studio" + condstr(isplayer, " - Player Mode"))
 	// Performance indicator: "(" + string_format(currspeed * 100, 1, 0) + "%) "
 	draw_set_alpha(1)
 	draw_theme_color()
@@ -2146,7 +2146,7 @@ function control_draw() {
 				draw_set_halign(fa_left)
 				draw_theme_color()
 				draw_theme_font(font_info_med)
-				draw_text_dynamic(rw / 2 - 200, rh / 2 - 80, condstr(filename != "-player", filename_name(filename)) + condstr((filename = "" || filename = "-player") && midiname != "", midiname), true)
+				draw_text_dynamic(rw / 2 - 200, rh / 2 - 80, condstr((protocol_data != pointer_null), song_download_display_name, condstr(filename != "-player", filename_name(filename)) + condstr((filename = "" || filename = "-player") && midiname != "", midiname), true))
 				draw_theme_font(font_main)
 				dropalpha = 1
 			} else {

scripts/download_song_from_url/download_song_from_url.gml

@@ -28,14 +28,30 @@ function download_song_from_url() {
 			// To avoid this from happening, we compare the Content-Length response header with the downloaded file's disk size.
 			var headers = async_load[? "response_headers"];
 			var contentLength = -1;
+			var contentDisposition = "";
 			if (headers > 0) {
 				contentLength = headers[? "Content-Length"];
+				contentDisposition = headers[? "Content-Disposition"]
 			}
 			var writtenFileSize = file_get_size(song_download_file);
 
+			// Read file name from Content-Disposition header, if present
+			var override_fn = "";
+			if (!is_undefined(contentDisposition) && string_count("attachment; filename=", contentDisposition) > 0) { // attachment; filename="<song.nbs>"
+				show_debug_message("Content-Disposition: " + contentDisposition)
+				
+				var firstQuotePos = string_pos("\"", contentDisposition) + 1;
+				var lastQuotePos = string_last_pos("\"", contentDisposition);
+				override_fn = string_copy(contentDisposition, firstQuotePos, lastQuotePos - firstQuotePos);
+			}
+			
 			if (contentLength > 0 && writtenFileSize == contentLength) {
 				song_downloaded_size = song_total_size; // prevent freezing under 100%
-				load_song(song_download_file);
+				show_debug_message(override_fn);
+				load_song(song_download_file, true); // load as backup file (keep unsaved, don't add to recent etc.)
+				if (override_fn != "") {
+					song_download_display_name = override_fn; // override title bar display name
+				}
 				files_delete_lib(song_download_file);
 			} else {
 				if (language != 1) {