Hi Leo, On Fri, 24 Mar 2017 12:39:53 -0400, Leo Ufimtsev <leoni...@redhat.com> wrote: > Hello, > > I need to inject javascript objects and thus need to use webkit extensions. > > I was wondering, does anyone have some github project of a bare-bone webkit > extension snippet that I could build upon?
It's probably not the simplest example possible, but Epiphany does add JS functionality from its WebExtension. These are some pointers to the bits relevant to what you want to do: - First of all, read through the relevant documentation, and keep it under your pillow for reference: https://webkitgtk.org/reference/webkit2gtk/stable/WebKitWebExtension.html - You have to define webkit_web_extension_initialize_with_user_data() in your extension. The WebKitWebProcess will call this function when it gets loaded. https://git.gnome.org/browse/epiphany/tree/embed/web-extension/ephy-web-extension-main.c#n33 - Connect to the WebKitWebExtension::page-created signal: https://git.gnome.org/browse/epiphany/tree/embed/web-extension/ephy-web-extension.c#n1596 - Now in the handler for the ::page-created signal you can obtain the main frame with webkit_web_page_get_main_frame() https://webkitgtk.org/reference/webkit2gtk/stable/WebKitWebPage.html#webkit-web-page-get-main-frame - Once you have the main frame of a page, you can obtain its JavaScript global context with webkit_frame_get_javascript_global_context() https://webkitgtk.org/reference/webkit2gtk/stable/WebKitFrame.html#webkit-frame-get-javascript-global-context At this point, you have a “JSGlobalContextRef”, which is a kind of “JSContextRef”. You can peruse any online documentation (even Apple's!) which discusses the JavaScriptCore C API — it's the same as for other platforms. For example, you can start at the following how-to: https://karhm.com/JavaScriptCore_C_API/ For detailed documentation, I would recommend reading the “JS*Ref.h” headers in the “Source/JavaScriptCore/API/” subdirectory of the WebKit source tree. They include documentation comments of good quality. For example: https://trac.webkit.org/browser/webkit/trunk/Source/JavaScriptCore/API/JSContextRef.h https://trac.webkit.org/browser/webkit/trunk/Source/JavaScriptCore/API/JSObjectRef.h (Documentation for the C API used to be available at the Apple Developer DocumeDocumentation website; but nowadays they only have the Swift and Objective-C versions of the documentation, even when the C API is supported and well documented.) I hope this helps. Best regards, -- 💻 Adrián
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