LibWebView: Add autoplay settings to about:settings

The idea with the UI here is that it will serve as a generic component
for all site settings, such as autoplay, notifications, etc. When the
site settings dialog is opened, it is filled with the requested setting
data, and messages sent to the browser process are based on the setting.

This patch only implements the UI and persisted settings. It does not
apply autoplay changes to the WebContent process.

Libraries/LibWebView/Settings.cpp

@@ -5,6 +5,7 @@
  */
 
 #include <AK/ByteString.h>
+#include <AK/JsonArray.h>
 #include <AK/JsonObject.h>
 #include <AK/JsonValue.h>
 #include <AK/LexicalPath.h>
@@ -19,9 +20,15 @@
 namespace WebView {
 
 static constexpr auto new_tab_page_url_key = "newTabPageURL"sv;
+
 static constexpr auto search_engine_key = "searchEngine"sv;
 static constexpr auto search_engine_name_key = "name"sv;
 
+static constexpr auto site_setting_enabled_globally_key = "enabledGlobally"sv;
+static constexpr auto site_setting_site_filters_key = "siteFilters"sv;
+
+static constexpr auto autoplay_key = "autoplay"sv;
+
 static ErrorOr<JsonObject> read_settings_file(StringView settings_path)
 {
     auto settings_file = Core::File::open(settings_path, Core::File::OpenMode::Read);
@@ -74,6 +81,26 @@ Settings Settings::create(Badge<Application>)
             settings.m_search_engine = find_search_engine_by_name(*search_engine_name);
     }
 
+    auto load_site_setting = [&](SiteSetting& site_setting, StringView key) {
+        auto saved_settings = settings_json.value().get_object(key);
+        if (!saved_settings.has_value())
+            return;
+
+        if (auto enabled_globally = saved_settings->get_bool(site_setting_enabled_globally_key); enabled_globally.has_value())
+            site_setting.enabled_globally = *enabled_globally;
+
+        if (auto site_filters = saved_settings->get_array(site_setting_site_filters_key); site_filters.has_value()) {
+            site_setting.site_filters.clear();
+
+            site_filters->for_each([&](auto const& site_filter) {
+                if (site_filter.is_string())
+                    site_setting.site_filters.set(site_filter.as_string());
+            });
+        }
+    };
+
+    load_site_setting(settings.m_autoplay, autoplay_key);
+
     return settings;
 }
 
@@ -95,6 +122,22 @@ JsonValue Settings::serialize_json() const
         settings.set(search_engine_key, move(search_engine));
     }
 
+    auto save_site_setting = [&](SiteSetting const& site_setting, StringView key) {
+        JsonArray site_filters;
+        site_filters.ensure_capacity(site_setting.site_filters.size());
+
+        for (auto const& site_filter : site_setting.site_filters)
+            site_filters.must_append(site_filter);
+
+        JsonObject setting;
+        setting.set("enabledGlobally"sv, site_setting.enabled_globally);
+        setting.set("siteFilters"sv, move(site_filters));
+
+        settings.set(key, move(setting));
+    };
+
+    save_site_setting(m_autoplay, autoplay_key);
+
     return settings;
 }
 
@@ -102,6 +145,7 @@ void Settings::restore_defaults()
 {
     m_new_tab_page_url = URL::about_newtab();
     m_search_engine.clear();
+    m_autoplay = SiteSetting {};
 
     persist_settings();
 
@@ -131,6 +175,46 @@ void Settings::set_search_engine(Optional<StringView> search_engine_name)
         observer.search_engine_changed();
 }
 
+void Settings::set_autoplay_enabled_globally(bool enabled_globally)
+{
+    m_autoplay.enabled_globally = enabled_globally;
+    persist_settings();
+
+    for (auto& observer : m_observers)
+        observer.autoplay_settings_changed();
+}
+
+void Settings::add_autoplay_site_filter(String const& site_filter)
+{
+    auto trimmed_site_filter = MUST(site_filter.trim_whitespace());
+    if (trimmed_site_filter.is_empty())
+        return;
+
+    m_autoplay.site_filters.set(move(trimmed_site_filter));
+    persist_settings();
+
+    for (auto& observer : m_observers)
+        observer.autoplay_settings_changed();
+}
+
+void Settings::remove_autoplay_site_filter(String const& site_filter)
+{
+    m_autoplay.site_filters.remove(site_filter);
+    persist_settings();
+
+    for (auto& observer : m_observers)
+        observer.autoplay_settings_changed();
+}
+
+void Settings::remove_all_autoplay_site_filters()
+{
+    m_autoplay.site_filters.clear();
+    persist_settings();
+
+    for (auto& observer : m_observers)
+        observer.autoplay_settings_changed();
+}
+
 void Settings::persist_settings()
 {
     auto settings = serialize_json();
@@ -162,4 +246,9 @@ SettingsObserver::~SettingsObserver()
     Settings::remove_observer({}, *this);
 }
 
+SiteSetting::SiteSetting()
+{
+    site_filters.set("file://"_string);
+}
+
 }