Hi all, I want to implement content blocking for external material loaded from HTML messages in a MUA (balsa). Unfortunately, webkit_settings_set_auto_load_images() is not a solution, as I still want to display embedded images in the email, but I also want to suppress loading external styles, etc. The blocking shall work on a per-message basis, e.g. it shall always be allowed for some senders, but only after user permission for others.
From [1] I understand that I have to use the WebKitWebPage::send-request signal
in an extension. So I wrote an extension which
(1) connects the page "page-created" signal in
webkit_web_extension_initialize();
(2) the callback for (1)
(a) sends a message using webkit_web_page_send_message_to_view() to get the
blocking settings for the particular message, and
(b) connects to the "send-request" signal.
This seems to work just fine, but I feel that I need some synchronisation
between the main UI and the web process:
When the callback for (2b), i.e. for "send-request", is called, I must ensure that the
reply from the main UI process with the decision if external material shall be loaded for the
particular instance (email) has already been received, i.e. the callback registered in step (2a)
has already been called. IOW, the callback (2b) must not be called before the callback (2a) has
been processed, or I have to somehow "delay" the web process until this reply has been
received.
Is this possible? How?
Thanks in advance for any insight,
best,
Albrecht.
[1] <https://lists.webkit.org/pipermail/webkit-gtk/2021-May/003704.html>
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