[webkit-help] [WebKitGTK] Issue with web process extensions

[Alain Bareille]

For those that come after me, let it be known a solution is to be found
here:
https://discourse.gnome.org/t/webkitgtk-web-process-extension-not-loading/24809

On 29/10/2024 13:13, Alain Bareille wrote:
> Hello,
>
> I'm on Ubuntu Linux 24.04 Noble Numbat, with the following packages
> installed:
>
> - libwebkitgtk-6.0-4 2.46.1-0ubuntu0.24.04.1 amd64
> - libwebkitgtk-6.0-dev 2.46.1-0ubuntu0.24.04.1 amd64
>
> I'm trying to enable web process extensions in a mostly C++ written
> application. I've spent some hours going through the documentation and
> searching over the internet for a solution, but I don't find any issue
> with my code (although, I may be overlooking a small detail).
>
> Below, there's a minimal reproducing sample. Is anything wrong with my
> code? If not, how should I proceed to figure out where the issue is?
>
> Based on the code below, here's a few things I've tried already:
> - moving the libextension.so file to another path than ./ or
> specifying an absolute path to
> webkit_web_context_set_web_process_extensions_directory.
> - writing a tool using GModule that loads libextension.so and checks
> webkit_web_process_extension_initialize symbol can be reached with
> g_module_symbol().
> - running inside gdb and placing a breakpoint on
> WebKit::WebProcessExtensionManager::initialize from
> Source/WebKit/WebProcess/InjectedBundle/API/glib/WebProcessExtensionManager.cpp.
> That breakpoint is never triggered.
>
> =========== CMakeLists.txt
>
> cmake_minimum_required(VERSION 3.28.3)
>
> project(
>     IssueSample
>     VERSION 1.0.0
>     LANGUAGES C CXX)
>
> find_package(PkgConfig REQUIRED)
> pkg_check_modules(WebkitGTK REQUIRED IMPORTED_TARGET glib-2.0>=2.74
> gtk4>=4.14.2 webkitgtk-6.0)
>
> add_executable(browser main.cpp)
> target_link_libraries(browser PkgConfig::WebkitGTK)
>
> add_library(extension MODULE extension.c)
> target_link_libraries(extension PkgConfig::WebkitGTK)
>
> =========== extension.c
>
> #include <gtk/gtk.h>
> #include <webkit/webkit-web-process-extension.h>
>
> #ifdef __cplusplus
> #error Must be compiled as C
> #endif
>
> static void web_page_created_cb(WebKitWebProcessExtension *extension,
> WebKitWebPage *web_page, gpointer /* unused */)
> {
>     g_print("Page %ld created for %s with table\n",
> webkit_web_page_get_id(web_page),
>         webkit_web_page_get_uri(web_page));
> }
>
> G_MODULE_EXPORT void
> webkit_web_process_extension_initialize(WebKitWebProcessExtension
> *extension)
> {
>     g_print("Inside webkit_web_extension_initialize %p\n", extension);
>     g_signal_connect(extension, "page-created",
> G_CALLBACK(web_page_created_cb), NULL);
> }
>
> =========== main.cpp
>
> #include <gtk/gtk.h>
> #include <webkit/webkit.h>
>
> void initialize_web_extensions(WebKitWebContext *context, gpointer
> /*unused*/)
> {
>     webkit_web_context_set_web_process_extensions_directory(context,
> "./");
> }
>
> int main()
> {
>     gtk_init();
>
>     g_signal_connect(webkit_web_context_get_default(),
> "initialize-web-process-extensions",
>         G_CALLBACK(initialize_web_extensions), NULL);
>
>     GtkWindow * window = GTK_WINDOW(gtk_window_new());
>
>     WebKitWebView * web_view = WEBKIT_WEB_VIEW(webkit_web_view_new());
>
>     webkit_web_view_load_uri(web_view, "https://linux.org/");
>
>     gtk_window_set_child(window, GTK_WIDGET(web_view));
>
>     gtk_window_present(window);
>
>     while (g_list_model_get_n_items(gtk_window_get_toplevels()) > 0)
>     {
>         g_main_context_iteration(NULL, TRUE);
>     }
> }
>
> ===========
>
>
>

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