LibWebView+RequestServer: Add some UI for DNS settings

Author: https://github.com/alimpfard
Commit: 2c13504bfc
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/4278
Reviewed-by: https://github.com/trflynn89 ✅

Libraries/LibWebView/Settings.h

@@ -13,6 +13,7 @@
 #include <LibURL/URL.h>
 #include <LibWebView/Autocomplete.h>
 #include <LibWebView/Forward.h>
+#include <LibWebView/Options.h>
 #include <LibWebView/SearchEngine.h>
 
 namespace WebView {
@@ -31,7 +32,11 @@ enum class DoNotTrack {
 
 class SettingsObserver {
 public:
-    SettingsObserver();
+    enum class AddToObservers {
+        No,
+        Yes,
+    };
+    explicit SettingsObserver(AddToObservers = AddToObservers::Yes);
     virtual ~SettingsObserver();
 
     virtual void new_tab_page_url_changed() { }
@@ -40,6 +45,14 @@ public:
     virtual void autocomplete_engine_changed() { }
     virtual void autoplay_settings_changed() { }
     virtual void do_not_track_changed() { }
+    virtual void dns_settings_changed() { }
+
+protected:
+    void complete_delayed_registration();
+    void complete_delayed_unregistration();
+
+private:
+    bool m_registration_was_delayed { false };
 };
 
 class Settings {
@@ -76,6 +89,10 @@ public:
     DoNotTrack do_not_track() const { return m_do_not_track; }
     void set_do_not_track(DoNotTrack);
 
+    static DNSSettings parse_dns_settings(JsonValue const&);
+    DNSSettings const& dns_settings() const { return m_dns_settings; }
+    void set_dns_settings(DNSSettings const&, bool override_by_command_line = false);
+
     static void add_observer(Badge<SettingsObserver>, SettingsObserver&);
     static void remove_observer(Badge<SettingsObserver>, SettingsObserver&);
 
@@ -95,6 +112,8 @@ private:
     Optional<AutocompleteEngine> m_autocomplete_engine;
     SiteSetting m_autoplay;
     DoNotTrack m_do_not_track { DoNotTrack::No };
+    DNSSettings m_dns_settings { SystemDNS() };
+    bool m_dns_override_by_command_line { false };
 
     Vector<SettingsObserver&> m_observers;
 };