[HTML5] Add easy to use download API.

New `JavaScript.download_buffer` method to create a prompt that let the
user download a file.

7 files changed, 35 insertions, 61 deletions

diff --git a/platform/javascript/SCsub b/platform/javascript/SCsub
index d68ab7f7c9..62a8660ae4 100644
--- a/platform/javascript/SCsub
+++ b/platform/javascript/SCsub
@@ -23,8 +23,6 @@ sys_env.AddJSLibraries(
     ]
 )
 
-if env["tools"]:
-    sys_env.AddJSLibraries(["js/libs/library_godot_editor_tools.js"])
 if env["javascript_eval"]:
     sys_env.AddJSLibraries(["js/libs/library_godot_javascript_singleton.js"])
 
diff --git a/platform/javascript/api/api.cpp b/platform/javascript/api/api.cpp
index 039ce815e4..5ad2bf56cf 100644
--- a/platform/javascript/api/api.cpp
+++ b/platform/javascript/api/api.cpp
@@ -70,6 +70,7 @@ void JavaScript::_bind_methods() {
 		mi.arguments.push_back(PropertyInfo(Variant::STRING, "object"));
 		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"));
 }
 
 #if !defined(JAVASCRIPT_ENABLED) || !defined(JAVASCRIPT_EVAL_ENABLED)
@@ -100,3 +101,7 @@ Variant JavaScript::_create_object_bind(const Variant **p_args, int p_argcount,
 	return Ref<JavaScriptObject>();
 }
 #endif
+#if !defined(JAVASCRIPT_ENABLED)
+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 45e9950acb..1615efa87e 100644
--- a/platform/javascript/api/javascript_singleton.h
+++ b/platform/javascript/api/javascript_singleton.h
@@ -58,6 +58,7 @@ public:
 	Ref<JavaScriptObject> get_interface(const String &p_interface);
 	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");
 
 	static JavaScript *get_singleton();
 	JavaScript();
diff --git a/platform/javascript/api/javascript_tools_editor_plugin.cpp b/platform/javascript/api/javascript_tools_editor_plugin.cpp
index 015440f5be..ac4e6a1256 100644
--- a/platform/javascript/api/javascript_tools_editor_plugin.cpp
+++ b/platform/javascript/api/javascript_tools_editor_plugin.cpp
@@ -41,7 +41,7 @@
 
 // JavaScript functions defined in library_godot_editor_tools.js
 extern "C" {
-extern void godot_js_editor_download_file(const char *p_path, const char *p_name, const char *p_mime);
+extern int godot_js_os_download_buffer(const uint8_t *p_buf, int p_buf_size, const char *p_name, const char *p_mime);
 }
 
 static void _javascript_editor_init_callback() {
@@ -69,7 +69,12 @@ void JavaScriptToolsEditorPlugin::_download_zip(Variant p_v) {
 	String base_path = resource_path.substr(0, resource_path.rfind("/")) + "/";
 	_zip_recursive(resource_path, base_path, zip);
 	zipClose(zip, nullptr);
-	godot_js_editor_download_file("/tmp/project.zip", "project.zip", "application/zip");
+	FileAccess *f = FileAccess::open("/tmp/project.zip", FileAccess::READ);
+	ERR_FAIL_COND_MSG(!f, "Unable to create zip file");
+	Vector<uint8_t> buf;
+	buf.resize(f->get_len());
+	f->get_buffer(buf.ptrw(), buf.size());
+	godot_js_os_download_buffer(buf.ptr(), buf.size(), "project.zip", "application/zip");
 }
 
 void JavaScriptToolsEditorPlugin::_zip_file(String p_path, String p_base_path, zipFile p_zip) {
diff --git a/platform/javascript/javascript_singleton.cpp b/platform/javascript/javascript_singleton.cpp
index 67908a18da..5ef67c0cdd 100644
--- a/platform/javascript/javascript_singleton.cpp
+++ b/platform/javascript/javascript_singleton.cpp
@@ -301,6 +301,7 @@ union js_eval_ret {
 };
 
 extern int godot_js_eval(const char *p_js, int p_use_global_ctx, union js_eval_ret *p_union_ptr, void *p_byte_arr, void *p_byte_arr_write, void *(*p_callback)(void *p_ptr, void *p_ptr2, int p_len));
+extern int godot_js_os_download_buffer(const uint8_t *p_buf, int p_buf_size, const char *p_name, const char *p_mime);
 }
 
 void *resize_PackedByteArray_and_open_write(void *p_arr, void *r_write, int p_len) {
@@ -336,3 +337,7 @@ Variant JavaScript::eval(const String &p_code, bool p_use_global_exec_context) {
 	}
 }
 #endif // JAVASCRIPT_EVAL_ENABLED
+
+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());
+}
diff --git a/platform/javascript/js/libs/library_godot_editor_tools.js b/platform/javascript/js/libs/library_godot_editor_tools.js
deleted file mode 100644
index d7f1ad5ea1..0000000000
--- a/platform/javascript/js/libs/library_godot_editor_tools.js
+++ /dev/null
@@ -1,57 +0,0 @@
-/*************************************************************************/
-/*  library_godot_editor_tools.js                                        */
-/*************************************************************************/
-/*                       This file is part of:                           */
-/*                           GODOT ENGINE                                */
-/*                      https://godotengine.org                          */
-/*************************************************************************/
-/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur.                 */
-/* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md).   */
-/*                                                                       */
-/* Permission is hereby granted, free of charge, to any person obtaining */
-/* a copy of this software and associated documentation files (the       */
-/* "Software"), to deal in the Software without restriction, including   */
-/* without limitation the rights to use, copy, modify, merge, publish,   */
-/* distribute, sublicense, and/or sell copies of the Software, and to    */
-/* permit persons to whom the Software is furnished to do so, subject to */
-/* the following conditions:                                             */
-/*                                                                       */
-/* The above copyright notice and this permission notice shall be        */
-/* included in all copies or substantial portions of the Software.       */
-/*                                                                       */
-/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
-/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
-/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
-/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
-/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
-/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
-/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
-/*************************************************************************/
-
-const GodotEditorTools = {
-	godot_js_editor_download_file__deps: ['$FS'],
-	godot_js_editor_download_file__sig: 'viii',
-	godot_js_editor_download_file: function (p_path, p_name, p_mime) {
-		const path = GodotRuntime.parseString(p_path);
-		const name = GodotRuntime.parseString(p_name);
-		const mime = GodotRuntime.parseString(p_mime);
-		const size = FS.stat(path)['size'];
-		const buf = new Uint8Array(size);
-		const fd = FS.open(path, 'r');
-		FS.read(fd, buf, 0, size);
-		FS.close(fd);
-		FS.unlink(path);
-		const blob = new Blob([buf], { type: mime });
-		const url = window.URL.createObjectURL(blob);
-		const a = document.createElement('a');
-		a.href = url;
-		a.download = name;
-		a.style.display = 'none';
-		document.body.appendChild(a);
-		a.click();
-		a.remove();
-		window.URL.revokeObjectURL(url);
-	},
-};
-
-mergeInto(LibraryManager.library, GodotEditorTools);
diff --git a/platform/javascript/js/libs/library_godot_os.js b/platform/javascript/js/libs/library_godot_os.js
index 1d9f889bce..7414b8cc47 100644
--- a/platform/javascript/js/libs/library_godot_os.js
+++ b/platform/javascript/js/libs/library_godot_os.js
@@ -304,6 +304,23 @@ const GodotOS = {
 	godot_js_os_hw_concurrency_get: function () {
 		return navigator.hardwareConcurrency || 1;
 	},
+
+	godot_js_os_download_buffer__sig: 'viiii',
+	godot_js_os_download_buffer: function (p_ptr, p_size, p_name, p_mime) {
+		const buf = GodotRuntime.heapSlice(HEAP8, p_ptr, p_size);
+		const name = GodotRuntime.parseString(p_name);
+		const mime = GodotRuntime.parseString(p_mime);
+		const blob = new Blob([buf], { type: mime });
+		const url = window.URL.createObjectURL(blob);
+		const a = document.createElement('a');
+		a.href = url;
+		a.download = name;
+		a.style.display = 'none';
+		document.body.appendChild(a);
+		a.click();
+		a.remove();
+		window.URL.revokeObjectURL(url);
+	},
 };
 
 autoAddDeps(GodotOS, '$GodotOS');