13 files changed, 146 insertions, 26 deletions

diff --git a/platform/javascript/api/api.cpp b/platform/javascript/api/api.cpp
index 0c4accccc3..4190b24b8e 100644
--- a/platform/javascript/api/api.cpp
+++ b/platform/javascript/api/api.cpp
@@ -71,6 +71,9 @@ void JavaScript::_bind_methods() {
 		ClassDB::bind_vararg_method(METHOD_FLAGS_DEFAULT, "create_object", &JavaScript::_create_object_bind, mi);
 	}
 	ClassDB::bind_method(D_METHOD("download_buffer", "buffer", "name", "mime"), &JavaScript::download_buffer, DEFVAL("application/octet-stream"));
+	ClassDB::bind_method(D_METHOD("pwa_needs_update"), &JavaScript::pwa_needs_update);
+	ClassDB::bind_method(D_METHOD("pwa_update"), &JavaScript::pwa_update);
+	ADD_SIGNAL(MethodInfo("pwa_update_available"));
 }
 
 #if !defined(JAVASCRIPT_ENABLED) || !defined(JAVASCRIPT_EVAL_ENABLED)
@@ -102,6 +105,12 @@ Variant JavaScript::_create_object_bind(const Variant **p_args, int p_argcount,
 }
 #endif
 #if !defined(JAVASCRIPT_ENABLED)
+bool JavaScript::pwa_needs_update() const {
+	return false;
+}
+Error JavaScript::pwa_update() {
+	return ERR_UNAVAILABLE;
+}
 void JavaScript::download_buffer(Vector<uint8_t> p_arr, const String &p_name, const String &p_mime) {
 }
 #endif
diff --git a/platform/javascript/api/javascript_singleton.h b/platform/javascript/api/javascript_singleton.h
index 63f1aec624..e93b0a18a1 100644
--- a/platform/javascript/api/javascript_singleton.h
+++ b/platform/javascript/api/javascript_singleton.h
@@ -59,6 +59,8 @@ public:
 	Ref<JavaScriptObject> create_callback(const Callable &p_callable);
 	Variant _create_object_bind(const Variant **p_args, int p_argcount, Callable::CallError &r_error);
 	void download_buffer(Vector<uint8_t> p_arr, const String &p_name, const String &p_mime = "application/octet-stream");
+	bool pwa_needs_update() const;
+	Error pwa_update();
 
 	static JavaScript *get_singleton();
 	JavaScript();
diff --git a/platform/javascript/display_server_javascript.cpp b/platform/javascript/display_server_javascript.cpp
index 2842fc2f5e..a0e1246c55 100644
--- a/platform/javascript/display_server_javascript.cpp
+++ b/platform/javascript/display_server_javascript.cpp
@@ -663,7 +663,7 @@ DisplayServerJavaScript::DisplayServerJavaScript(const String &p_rendering_drive
 	godot_js_config_canvas_id_get(canvas_id, 256);
 
 	// Handle contextmenu, webglcontextlost
-	godot_js_display_setup_canvas(p_resolution.x, p_resolution.y, p_window_mode == WINDOW_MODE_FULLSCREEN, OS::get_singleton()->is_hidpi_allowed() ? 1 : 0);
+	godot_js_display_setup_canvas(p_resolution.x, p_resolution.y, (p_window_mode == WINDOW_MODE_FULLSCREEN || p_window_mode == WINDOW_MODE_EXCLUSIVE_FULLSCREEN), OS::get_singleton()->is_hidpi_allowed() ? 1 : 0);
 
 	// Check if it's windows.
 	swap_cancel_ok = godot_js_display_is_swap_ok_cancel() == 1;
@@ -794,6 +794,10 @@ float DisplayServerJavaScript::screen_get_scale(int p_screen) const {
 	return godot_js_display_pixel_ratio_get();
 }
 
+float DisplayServerJavaScript::screen_get_refresh_rate(int p_screen) const {
+	return SCREEN_REFRESH_RATE_FALLBACK; // Javascript doesn't have much of a need for the screen refresh rate, and there's no native way to do so.
+}
+
 Vector<DisplayServer::WindowID> DisplayServerJavaScript::get_window_list() const {
 	Vector<WindowID> ret;
 	ret.push_back(MAIN_WINDOW_ID);
@@ -897,6 +901,7 @@ void DisplayServerJavaScript::window_set_mode(WindowMode p_mode, WindowID p_wind
 			}
 			window_mode = WINDOW_MODE_WINDOWED;
 		} break;
+		case WINDOW_MODE_EXCLUSIVE_FULLSCREEN:
 		case WINDOW_MODE_FULLSCREEN: {
 			int result = godot_js_display_fullscreen_request();
 			ERR_FAIL_COND_MSG(result, "The request was denied. Remember that enabling fullscreen is only possible from an input callback for the HTML5 platform.");
diff --git a/platform/javascript/display_server_javascript.h b/platform/javascript/display_server_javascript.h
index 1ae5d68787..b50956d91c 100644
--- a/platform/javascript/display_server_javascript.h
+++ b/platform/javascript/display_server_javascript.h
@@ -139,6 +139,7 @@ public:
 	virtual Rect2i screen_get_usable_rect(int p_screen = SCREEN_OF_MAIN_WINDOW) const override;
 	virtual int screen_get_dpi(int p_screen = SCREEN_OF_MAIN_WINDOW) const override;
 	virtual float screen_get_scale(int p_screen = SCREEN_OF_MAIN_WINDOW) const override;
+	virtual float screen_get_refresh_rate(int p_screen = SCREEN_OF_MAIN_WINDOW) const override;
 
 	virtual void virtual_keyboard_show(const String &p_existing_text, const Rect2 &p_screen_rect = Rect2(), bool p_multiline = false, int p_max_input_length = -1, int p_cursor_start = -1, int p_cursor_end = -1) override;
 	virtual void virtual_keyboard_hide() override;
diff --git a/platform/javascript/export/export_plugin.cpp b/platform/javascript/export/export_plugin.cpp
index db0d506cdf..d4c198d631 100644
--- a/platform/javascript/export/export_plugin.cpp
+++ b/platform/javascript/export/export_plugin.cpp
@@ -139,8 +139,7 @@ void EditorExportPlatformJavaScript::_fix_html(Vector<uint8_t> &p_html, const Re
 	}
 	if (p_preset->get("progressive_web_app/enabled")) {
 		head_include += "<link rel='manifest' href='" + p_name + ".manifest.json'>\n";
-		head_include += "<script type='application/javascript'>window.addEventListener('load', () => {if ('serviceWorker' in navigator) {navigator.serviceWorker.register('" +
-				p_name + ".service.worker.js');}});</script>\n";
+		config["serviceWorker"] = p_name + ".service.worker.js";
 	}
 
 	// Replaces HTML string
@@ -188,35 +187,46 @@ Error EditorExportPlatformJavaScript::_add_manifest_icon(const String &p_path, c
 }
 
 Error EditorExportPlatformJavaScript::_build_pwa(const Ref<EditorExportPreset> &p_preset, const String p_path, const Vector<SharedObject> &p_shared_objects) {
+	String proj_name = ProjectSettings::get_singleton()->get_setting("application/config/name");
+	if (proj_name.is_empty()) {
+		proj_name = "Godot Game";
+	}
+
 	// Service worker
 	const String dir = p_path.get_base_dir();
 	const String name = p_path.get_file().get_basename();
 	const ExportMode mode = (ExportMode)(int)p_preset->get("variant/export_type");
 	Map<String, String> replaces;
-	replaces["@GODOT_VERSION@"] = "1";
-	replaces["@GODOT_NAME@"] = name;
+	replaces["@GODOT_VERSION@"] = String::num_int64(OS::get_singleton()->get_unix_time()) + "|" + String::num_int64(OS::get_singleton()->get_ticks_usec());
+	replaces["@GODOT_NAME@"] = proj_name.substr(0, 16);
 	replaces["@GODOT_OFFLINE_PAGE@"] = name + ".offline.html";
-	Array files;
-	replaces["@GODOT_OPT_CACHE@"] = Variant(files).to_json_string();
-	files.push_back(name + ".html");
-	files.push_back(name + ".js");
-	files.push_back(name + ".wasm");
-	files.push_back(name + ".pck");
-	files.push_back(name + ".offline.html");
+
+	// Files cached during worker install.
+	Array cache_files;
+	cache_files.push_back(name + ".html");
+	cache_files.push_back(name + ".js");
+	cache_files.push_back(name + ".offline.html");
 	if (p_preset->get("html/export_icon")) {
-		files.push_back(name + ".icon.png");
-		files.push_back(name + ".apple-touch-icon.png");
+		cache_files.push_back(name + ".icon.png");
+		cache_files.push_back(name + ".apple-touch-icon.png");
 	}
 	if (mode == EXPORT_MODE_THREADS) {
-		files.push_back(name + ".worker.js");
-		files.push_back(name + ".audio.worklet.js");
-	} else if (mode == EXPORT_MODE_GDNATIVE) {
-		files.push_back(name + ".side.wasm");
+		cache_files.push_back(name + ".worker.js");
+		cache_files.push_back(name + ".audio.worklet.js");
+	}
+	replaces["@GODOT_CACHE@"] = Variant(cache_files).to_json_string();
+
+	// Heavy files that are cached on demand.
+	Array opt_cache_files;
+	opt_cache_files.push_back(name + ".wasm");
+	opt_cache_files.push_back(name + ".pck");
+	if (mode == EXPORT_MODE_GDNATIVE) {
+		opt_cache_files.push_back(name + ".side.wasm");
 		for (int i = 0; i < p_shared_objects.size(); i++) {
-			files.push_back(p_shared_objects[i].path.get_file());
+			opt_cache_files.push_back(p_shared_objects[i].path.get_file());
 		}
 	}
-	replaces["@GODOT_CACHE@"] = Variant(files).to_json_string();
+	replaces["@GODOT_OPT_CACHE@"] = Variant(opt_cache_files).to_json_string();
 
 	const String sw_path = dir.plus_file(name + ".service.worker.js");
 	Vector<uint8_t> sw;
@@ -256,10 +266,6 @@ Error EditorExportPlatformJavaScript::_build_pwa(const Ref<EditorExportPreset> &
 	const int orientation = CLAMP(int(p_preset->get("progressive_web_app/orientation")), 0, 3);
 
 	Dictionary manifest;
-	String proj_name = ProjectSettings::get_singleton()->get_setting("application/config/name");
-	if (proj_name.is_empty()) {
-		proj_name = "Godot Game";
-	}
 	manifest["name"] = proj_name;
 	manifest["start_url"] = "./" + name + ".html";
 	manifest["display"] = String::utf8(modes[display]);
@@ -658,7 +664,7 @@ EditorExportPlatformJavaScript::EditorExportPlatformJavaScript() {
 
 	Ref<Theme> theme = EditorNode::get_singleton()->get_editor_theme();
 	if (theme.is_valid()) {
-		stop_icon = theme->get_icon("Stop", "EditorIcons");
+		stop_icon = theme->get_icon(SNAME("Stop"), SNAME("EditorIcons"));
 	} else {
 		stop_icon.instantiate();
 	}
diff --git a/platform/javascript/export/export_plugin.h b/platform/javascript/export/export_plugin.h
index c55a881911..278e317430 100644
--- a/platform/javascript/export/export_plugin.h
+++ b/platform/javascript/export/export_plugin.h
@@ -87,7 +87,7 @@ class EditorExportPlatformJavaScript : public EditorExportPlatform {
 		icon.instantiate();
 		const String icon_path = String(GLOBAL_GET("application/config/icon")).strip_edges();
 		if (icon_path.is_empty() || ImageLoader::load_image(icon_path, icon) != OK) {
-			return EditorNode::get_singleton()->get_editor_theme()->get_icon("DefaultProjectIcon", "EditorIcons")->get_image();
+			return EditorNode::get_singleton()->get_editor_theme()->get_icon(SNAME("DefaultProjectIcon"), SNAME("EditorIcons"))->get_image();
 		}
 		return icon;
 	}
diff --git a/platform/javascript/godot_js.h b/platform/javascript/godot_js.h
index 15de8b5dc7..2cb5c3025c 100644
--- a/platform/javascript/godot_js.h
+++ b/platform/javascript/godot_js.h
@@ -49,6 +49,8 @@ extern void godot_js_os_fs_sync(void (*p_callback)());
 extern int godot_js_os_execute(const char *p_json);
 extern void godot_js_os_shell_open(const char *p_uri);
 extern int godot_js_os_hw_concurrency_get();
+extern int godot_js_pwa_cb(void (*p_callback)());
+extern int godot_js_pwa_update();
 
 // Input
 extern void godot_js_input_mouse_button_cb(int (*p_callback)(int p_pressed, int p_button, double p_x, double p_y, int p_modifiers));
diff --git a/platform/javascript/javascript_singleton.cpp b/platform/javascript/javascript_singleton.cpp
index b10e8007c0..77858bff01 100644
--- a/platform/javascript/javascript_singleton.cpp
+++ b/platform/javascript/javascript_singleton.cpp
@@ -30,6 +30,7 @@
 
 #include "api/javascript_singleton.h"
 #include "emscripten.h"
+#include "os_javascript.h"
 
 extern "C" {
 extern void godot_js_os_download_buffer(const uint8_t *p_buf, int p_buf_size, const char *p_name, const char *p_mime);
@@ -355,3 +356,10 @@ Variant JavaScript::eval(const String &p_code, bool p_use_global_exec_context) {
 void JavaScript::download_buffer(Vector<uint8_t> p_arr, const String &p_name, const String &p_mime) {
 	godot_js_os_download_buffer(p_arr.ptr(), p_arr.size(), p_name.utf8().get_data(), p_mime.utf8().get_data());
 }
+
+bool JavaScript::pwa_needs_update() const {
+	return OS_JavaScript::get_singleton()->pwa_needs_update();
+}
+Error JavaScript::pwa_update() {
+	return OS_JavaScript::get_singleton()->pwa_update();
+}
diff --git a/platform/javascript/js/engine/config.js b/platform/javascript/js/engine/config.js
index a6f9c4614c..2e5e1ed0d1 100644
--- a/platform/javascript/js/engine/config.js
+++ b/platform/javascript/js/engine/config.js
@@ -107,6 +107,13 @@ const InternalConfig = function (initConfig) { // eslint-disable-line no-unused-
 		 */
 		experimentalVK: false,
 		/**
+		 * The progressive web app service worker to install.
+		 * @memberof EngineConfig
+		 * @default
+		 * @type {string}
+		 */
+		serviceWorker: '',
+		/**
 		 * @ignore
 		 * @type {Array.<string>}
 		 */
@@ -249,6 +256,7 @@ const InternalConfig = function (initConfig) { // eslint-disable-line no-unused-
 		this.persistentDrops = parse('persistentDrops', this.persistentDrops);
 		this.experimentalVK = parse('experimentalVK', this.experimentalVK);
 		this.focusCanvas = parse('focusCanvas', this.focusCanvas);
+		this.serviceWorker = parse('serviceWorker', this.serviceWorker);
 		this.gdnativeLibs = parse('gdnativeLibs', this.gdnativeLibs);
 		this.fileSizes = parse('fileSizes', this.fileSizes);
 		this.args = parse('args', this.args);
diff --git a/platform/javascript/js/engine/engine.js b/platform/javascript/js/engine/engine.js
index 17a8df9e29..d2ba595083 100644
--- a/platform/javascript/js/engine/engine.js
+++ b/platform/javascript/js/engine/engine.js
@@ -189,6 +189,9 @@ const Engine = (function () {
 							preloader.preloadedFiles.length = 0; // Clear memory
 							me.rtenv['callMain'](me.config.args);
 							initPromise = null;
+							if (me.config.serviceWorker && 'serviceWorker' in navigator) {
+								navigator.serviceWorker.register(me.config.serviceWorker);
+							}
 							resolve();
 						});
 					});
diff --git a/platform/javascript/js/libs/library_godot_os.js b/platform/javascript/js/libs/library_godot_os.js
index 662d215443..12d06a8d51 100644
--- a/platform/javascript/js/libs/library_godot_os.js
+++ b/platform/javascript/js/libs/library_godot_os.js
@@ -368,3 +368,58 @@ const GodotEventListeners = {
 	},
 };
 mergeInto(LibraryManager.library, GodotEventListeners);
+
+const GodotPWA = {
+
+	$GodotPWA__deps: ['$GodotRuntime', '$GodotEventListeners'],
+	$GodotPWA: {
+		hasUpdate: false,
+
+		updateState: function (cb, reg) {
+			if (!reg) {
+				return;
+			}
+			if (!reg.active) {
+				return;
+			}
+			if (reg.waiting) {
+				GodotPWA.hasUpdate = true;
+				cb();
+			}
+			GodotEventListeners.add(reg, 'updatefound', function () {
+				const installing = reg.installing;
+				GodotEventListeners.add(installing, 'statechange', function () {
+					if (installing.state === 'installed') {
+						GodotPWA.hasUpdate = true;
+						cb();
+					}
+				});
+			});
+		},
+	},
+
+	godot_js_pwa_cb__sig: 'vi',
+	godot_js_pwa_cb: function (p_update_cb) {
+		if ('serviceWorker' in navigator) {
+			const cb = GodotRuntime.get_func(p_update_cb);
+			navigator.serviceWorker.getRegistration().then(GodotPWA.updateState.bind(null, cb));
+		}
+	},
+
+	godot_js_pwa_update__sig: 'i',
+	godot_js_pwa_update: function () {
+		if ('serviceWorker' in navigator && GodotPWA.hasUpdate) {
+			navigator.serviceWorker.getRegistration().then(function (reg) {
+				if (!reg || !reg.waiting) {
+					return;
+				}
+				reg.waiting.postMessage('update');
+			});
+			return 0;
+		}
+		return 1;
+	},
+};
+
+autoAddDeps(GodotPWA, '$GodotPWA');
+mergeInto(LibraryManager.library, GodotPWA);
diff --git a/platform/javascript/os_javascript.cpp b/platform/javascript/os_javascript.cpp
index 39eea13ca1..de5ca44f9d 100644
--- a/platform/javascript/os_javascript.cpp
+++ b/platform/javascript/os_javascript.cpp
@@ -45,6 +45,7 @@
 #include <emscripten.h>
 #include <stdlib.h>
 
+#include "api/javascript_singleton.h"
 #include "godot_js.h"
 
 void OS_JavaScript::alert(const String &p_alert, const String &p_title) {
@@ -203,6 +204,19 @@ void OS_JavaScript::file_access_close_callback(const String &p_file, int p_flags
 	}
 }
 
+void OS_JavaScript::update_pwa_state_callback() {
+	if (OS_JavaScript::get_singleton()) {
+		OS_JavaScript::get_singleton()->pwa_is_waiting = true;
+	}
+	if (JavaScript::get_singleton()) {
+		JavaScript::get_singleton()->emit_signal("pwa_update_available");
+	}
+}
+
+Error OS_JavaScript::pwa_update() {
+	return godot_js_pwa_update() ? FAILED : OK;
+}
+
 bool OS_JavaScript::is_userfs_persistent() const {
 	return idb_available;
 }
@@ -226,6 +240,8 @@ OS_JavaScript::OS_JavaScript() {
 	godot_js_config_locale_get(locale_ptr, 16);
 	setenv("LANG", locale_ptr, true);
 
+	godot_js_pwa_cb(&OS_JavaScript::update_pwa_state_callback);
+
 	if (AudioDriverJavaScript::is_available()) {
 #ifdef NO_THREADS
 		audio_drivers.push_back(memnew(AudioDriverScriptProcessor));
diff --git a/platform/javascript/os_javascript.h b/platform/javascript/os_javascript.h
index 3404fe9dcf..9e272f9aa1 100644
--- a/platform/javascript/os_javascript.h
+++ b/platform/javascript/os_javascript.h
@@ -45,11 +45,13 @@ class OS_JavaScript : public OS_Unix {
 	bool idb_is_syncing = false;
 	bool idb_available = false;
 	bool idb_needs_sync = false;
+	bool pwa_is_waiting = false;
 
 	static void main_loop_callback();
 
 	static void file_access_close_callback(const String &p_file, int p_flags);
 	static void fs_sync_callback();
+	static void update_pwa_state_callback();
 
 protected:
 	void initialize() override;
@@ -65,6 +67,9 @@ public:
 	// Override return type to make writing static callbacks less tedious.
 	static OS_JavaScript *get_singleton();
 
+	bool pwa_needs_update() const { return pwa_is_waiting; }
+	Error pwa_update();
+
 	void initialize_joypads() override;
 
 	MainLoop *get_main_loop() const override;