From 615fd98620d577c82ed9d99fd51ceeee714430ba Mon Sep 17 00:00:00 2001
From: Fabio Alessandrelli <fabio.alessandrelli@gmail.com>
Date: Tue, 27 Dec 2022 12:17:42 +0100
Subject: [Web] Expose API to force file system sync.

Mostly useful for modules and extensions that can't use FileAccess to
write files.
---
 doc/classes/JavaScriptBridge.xml               | 7 +++++++
 platform/web/api/api.cpp                       | 3 +++
 platform/web/api/javascript_bridge_singleton.h | 1 +
 platform/web/javascript_bridge_singleton.cpp   | 5 +++++
 platform/web/os_web.cpp                        | 6 ++++++
 platform/web/os_web.h                          | 1 +
 6 files changed, 23 insertions(+)

diff --git a/doc/classes/JavaScriptBridge.xml b/doc/classes/JavaScriptBridge.xml
index 5e36b5cc80..340c296eef 100644
--- a/doc/classes/JavaScriptBridge.xml
+++ b/doc/classes/JavaScriptBridge.xml
@@ -46,6 +46,13 @@
 				If [param use_global_execution_context] is [code]true[/code], the code will be evaluated in the global execution context. Otherwise, it is evaluated in the execution context of a function within the engine's runtime environment.
 			</description>
 		</method>
+		<method name="force_fs_sync">
+			<return type="void" />
+			<description>
+				Force synchronization of the persistent file system (when enabled).
+				[b]Note:[/b] This is only useful for modules or extensions that can't use [FileAccess] to write files.
+			</description>
+		</method>
 		<method name="get_interface">
 			<return type="JavaScriptObject" />
 			<param index="0" name="interface" type="String" />
diff --git a/platform/web/api/api.cpp b/platform/web/api/api.cpp
index e637f2aef2..9f43610d86 100644
--- a/platform/web/api/api.cpp
+++ b/platform/web/api/api.cpp
@@ -73,6 +73,7 @@ void JavaScriptBridge::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("download_buffer", "buffer", "name", "mime"), &JavaScriptBridge::download_buffer, DEFVAL("application/octet-stream"));
 	ClassDB::bind_method(D_METHOD("pwa_needs_update"), &JavaScriptBridge::pwa_needs_update);
 	ClassDB::bind_method(D_METHOD("pwa_update"), &JavaScriptBridge::pwa_update);
+	ClassDB::bind_method(D_METHOD("force_fs_sync"), &JavaScriptBridge::force_fs_sync);
 	ADD_SIGNAL(MethodInfo("pwa_update_available"));
 }
 
@@ -111,6 +112,8 @@ bool JavaScriptBridge::pwa_needs_update() const {
 Error JavaScriptBridge::pwa_update() {
 	return ERR_UNAVAILABLE;
 }
+void JavaScriptBridge::force_fs_sync() {
+}
 void JavaScriptBridge::download_buffer(Vector<uint8_t> p_arr, const String &p_name, const String &p_mime) {
 }
 #endif
diff --git a/platform/web/api/javascript_bridge_singleton.h b/platform/web/api/javascript_bridge_singleton.h
index 1e7b5a1699..93288cdea1 100644
--- a/platform/web/api/javascript_bridge_singleton.h
+++ b/platform/web/api/javascript_bridge_singleton.h
@@ -61,6 +61,7 @@ public:
 	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();
+	void force_fs_sync();
 
 	static JavaScriptBridge *get_singleton();
 	JavaScriptBridge();
diff --git a/platform/web/javascript_bridge_singleton.cpp b/platform/web/javascript_bridge_singleton.cpp
index 69cd0cece1..ce94d511a6 100644
--- a/platform/web/javascript_bridge_singleton.cpp
+++ b/platform/web/javascript_bridge_singleton.cpp
@@ -361,6 +361,11 @@ void JavaScriptBridge::download_buffer(Vector<uint8_t> p_arr, const String &p_na
 bool JavaScriptBridge::pwa_needs_update() const {
 	return OS_Web::get_singleton()->pwa_needs_update();
 }
+
 Error JavaScriptBridge::pwa_update() {
 	return OS_Web::get_singleton()->pwa_update();
 }
+
+void JavaScriptBridge::force_fs_sync() {
+	OS_Web::get_singleton()->force_fs_sync();
+}
diff --git a/platform/web/os_web.cpp b/platform/web/os_web.cpp
index 07c53e51d0..6152e803de 100644
--- a/platform/web/os_web.cpp
+++ b/platform/web/os_web.cpp
@@ -196,6 +196,12 @@ void OS_Web::update_pwa_state_callback() {
 	}
 }
 
+void OS_Web::force_fs_sync() {
+	if (is_userfs_persistent()) {
+		idb_needs_sync = true;
+	}
+}
+
 Error OS_Web::pwa_update() {
 	return godot_js_pwa_update() ? FAILED : OK;
 }
diff --git a/platform/web/os_web.h b/platform/web/os_web.h
index 64f3a4d133..21fd212db6 100644
--- a/platform/web/os_web.h
+++ b/platform/web/os_web.h
@@ -69,6 +69,7 @@ public:
 
 	bool pwa_needs_update() const { return pwa_is_waiting; }
 	Error pwa_update();
+	void force_fs_sync();
 
 	void initialize_joypads() override;
 
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