LibWeb: Support sending DNT header with requests

Author: https://github.com/jamierocks
Commit: https://github.com/LadybirdBrowser/ladybird/commit/fb20326979
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/373
Reviewed-by: https://github.com/trflynn89

Userland/Libraries/LibWeb/Fetch/Fetching/Fetching.cpp

@@ -1689,6 +1689,10 @@ WebIDL::ExceptionOr<JS::NonnullGCPtr<PendingResponse>> http_network_or_cache_fet
         // NOTE: `Accept` and `Accept-Language` are already included (unless fetch() is used, which does not include
         //       the latter by default), and `Accept-Charset` is a waste of bytes. See HTTP header layer division for
         //       more details.
+        if (ResourceLoader::the().enable_do_not_track() && !http_request->header_list()->contains("DNT"sv.bytes())) {
+            auto header = Infrastructure::Header::from_string_pair("DNT"sv, "1"sv);
+            http_request->header_list()->append(move(header));
+        }
 
         // 21. If includeCredentials is true, then:
         if (include_credentials == IncludeCredentials::Yes) {

Userland/Libraries/LibWeb/Loader/ResourceLoader.h

@@ -99,6 +99,9 @@ public:
     String const& platform() const { return m_platform; }
     void set_platform(String platform) { m_platform = move(platform); }
 
+    bool enable_do_not_track() const { return m_enable_do_not_track; }
+    void set_enable_do_not_track(bool enable) { m_enable_do_not_track = enable; }
+
     void clear_cache();
     void evict_from_cache(LoadRequest const&);
 
@@ -116,6 +119,7 @@ private:
     NonnullRefPtr<ResourceLoaderConnector> m_connector;
     String m_user_agent;
     String m_platform;
+    bool m_enable_do_not_track { false };
     Optional<JS::GCPtr<Page>> m_page {};
 };
 

Userland/Libraries/LibWebView/ViewImplementation.cpp

@@ -169,6 +169,11 @@ void ViewImplementation::set_preferred_motion(Web::CSS::PreferredMotion motion)
     client().async_set_preferred_motion(page_id(), motion);
 }
 
+void ViewImplementation::set_enable_do_not_track(bool enable)
+{
+    client().async_set_enable_do_not_track(page_id(), enable);
+}
+
 ByteString ViewImplementation::selected_text()
 {
     return client().get_selected_text(page_id());

Userland/Libraries/LibWebView/ViewImplementation.h

@@ -66,6 +66,8 @@ public:
     void set_preferred_contrast(Web::CSS::PreferredContrast);
     void set_preferred_motion(Web::CSS::PreferredMotion);
 
+    void set_enable_do_not_track(bool);
+
     ByteString selected_text();
     Optional<String> selected_text_with_whitespace_collapsed();
     void select_all();

Userland/Services/WebContent/ConnectionFromClient.cpp

@@ -928,6 +928,11 @@ void ConnectionFromClient::set_preferred_motion(u64 page_id, Web::CSS::Preferred
         page->set_preferred_motion(motion);
 }
 
+void ConnectionFromClient::set_enable_do_not_track(u64, bool enable)
+{
+    Web::ResourceLoader::the().set_enable_do_not_track(enable);
+}
+
 void ConnectionFromClient::set_has_focus(u64 page_id, bool has_focus)
 {
     if (auto page = this->page(page_id); page.has_value())

Userland/Services/WebContent/ConnectionFromClient.h

@@ -95,6 +95,7 @@ private:
     virtual void set_preferred_color_scheme(u64 page_id, Web::CSS::PreferredColorScheme const&) override;
     virtual void set_preferred_contrast(u64 page_id, Web::CSS::PreferredContrast const&) override;
     virtual void set_preferred_motion(u64 page_id, Web::CSS::PreferredMotion const&) override;
+    virtual void set_enable_do_not_track(u64 page_id, bool) override;
     virtual void set_has_focus(u64 page_id, bool) override;
     virtual void set_is_scripting_enabled(u64 page_id, bool) override;
     virtual void set_device_pixels_per_css_pixel(u64 page_id, float) override;

Userland/Services/WebContent/WebContentServer.ipc

@@ -81,6 +81,7 @@ endpoint WebContentServer
     set_preferred_color_scheme(u64 page_id, Web::CSS::PreferredColorScheme color_scheme) =|
     set_preferred_contrast(u64 page_id, Web::CSS::PreferredContrast contrast) =|
     set_preferred_motion(u64 page_id, Web::CSS::PreferredMotion motion) =|
+    set_enable_do_not_track(u64 page_id, bool enable) =|
     set_has_focus(u64 page_id, bool has_focus) =|
     set_is_scripting_enabled(u64 page_id, bool is_scripting_enabled) =|
     set_device_pixels_per_css_pixel(u64 page_id, float device_pixels_per_css_pixel) =|