From 53481830a93a282bfb11d50797a432ac72d1d34d Mon Sep 17 00:00:00 2001
From: Lea Anthony <lea.anthony@gmail.com>
Date: Mon, 29 Nov 2021 08:25:42 +1100
Subject: [PATCH] [linux] Basic webview working

---
 .../frontend/desktop/linux/frontend.go        | 43 +++++++++++++++++++
 v2/internal/frontend/desktop/linux/window.go  | 10 +++++
 2 files changed, 53 insertions(+)

diff --git a/v2/internal/frontend/desktop/linux/frontend.go b/v2/internal/frontend/desktop/linux/frontend.go
index 2ffd37ac2..3b4c3409d 100644
--- a/v2/internal/frontend/desktop/linux/frontend.go
+++ b/v2/internal/frontend/desktop/linux/frontend.go
@@ -7,6 +7,7 @@ package linux
 #cgo linux pkg-config: gtk+-3.0 webkit2gtk-4.0
 
 #include "gtk/gtk.h"
+#include "webkit2/webkit2.h"
 
 extern void callDispatchedMethod(int id);
 
@@ -31,8 +32,10 @@ import (
 	"log"
 	"os"
 	"strconv"
+	"strings"
 	"sync"
 	"text/template"
+	"unsafe"
 )
 
 type Frontend struct {
@@ -101,6 +104,7 @@ func NewFrontend(ctx context.Context, appoptions *options.App, myLogger *logger.
 	result.assets = assets
 
 	go result.startMessageProcessor()
+	go result.startRequestProcessor()
 
 	C.gtk_init(nil, nil)
 
@@ -438,3 +442,42 @@ func callDispatchedMethod(cid C.int) {
 		println("Error: No dispatch method with id", id, cid)
 	}
 }
+
+var requestBuffer = make(chan unsafe.Pointer, 100)
+
+func (f *Frontend) startRequestProcessor() {
+	for request := range requestBuffer {
+		f.processRequest(request)
+	}
+}
+
+//export processURLRequest
+func processURLRequest(request unsafe.Pointer) {
+	requestBuffer <- request
+}
+
+func (f *Frontend) processRequest(request unsafe.Pointer) {
+	req := (*C.WebKitURISchemeRequest)(request)
+	uri := C.webkit_uri_scheme_request_get_uri(req)
+	goURI := C.GoString(uri)
+
+	// Translate URI
+	goURI = strings.TrimPrefix(goURI, "wails://")
+	if !strings.HasPrefix(goURI, "/") {
+		return
+	}
+
+	// Load file from asset store
+	content, mimeType, err := f.assets.Load(goURI)
+	if err != nil {
+		return
+	}
+
+	cContent := C.CString(string(content))
+	defer C.free(unsafe.Pointer(cContent))
+	cMimeType := C.CString(mimeType)
+	defer C.free(unsafe.Pointer(cMimeType))
+	var cLen C.long = (C.long)(C.strlen(cContent))
+	stream := C.g_memory_input_stream_new_from_data(unsafe.Pointer(cContent), cLen, nil)
+	C.webkit_uri_scheme_request_finish(req, stream, cLen, cMimeType)
+}
diff --git a/v2/internal/frontend/desktop/linux/window.go b/v2/internal/frontend/desktop/linux/window.go
index 0195ae7ab..b3c9974fe 100644
--- a/v2/internal/frontend/desktop/linux/window.go
+++ b/v2/internal/frontend/desktop/linux/window.go
@@ -105,9 +105,14 @@ ulong setupInvokeSignal(void* contentManager) {
 	return g_signal_connect((WebKitUserContentManager*)contentManager, "script-message-received::external", G_CALLBACK(sendMessageToBackend), NULL);
 }
 
+extern void processURLRequest(WebKitURISchemeRequest *request);
+
 GtkWidget* setupWebview(void* contentManager, GtkWindow* window) {
 	GtkWidget* webview = webkit_web_view_new_with_user_content_manager((WebKitUserContentManager*)contentManager);
 	gtk_container_add(GTK_CONTAINER(window), webview);
+	WebKitWebContext *context = webkit_web_context_get_default();
+	webkit_web_context_register_uri_scheme(context, "wails", (WebKitURISchemeRequestCallback)processURLRequest, NULL, NULL);
+	//g_signal_connect(G_OBJECT(webview), "load-changed", G_CALLBACK(webview_load_changed_cb), NULL);
 	return webview;
 }
 
@@ -117,6 +122,10 @@ void devtoolsEnabled(void* webview, int enabled) {
 	webkit_settings_set_enable_developer_extras(settings, genabled);
 }
 
+
+void loadIndex(void* webview) {
+	webkit_web_view_load_uri(WEBKIT_WEB_VIEW(webview), "wails:///");
+}
 */
 import "C"
 import (
@@ -290,6 +299,7 @@ func (w *Window) UpdateApplicationMenu() {
 }
 
 func (w *Window) Run() {
+	C.loadIndex(w.webview)
 	C.gtk_widget_show_all(w.asGTKWidget())
 	w.Center()
 	switch w.appoptions.WindowStartState {