script/dom/

navigator.rs

/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at https://mozilla.org/MPL/2.0/. */

#[cfg(feature = "gamepad")]
use std::cell::Cell;
use std::convert::TryInto;
use std::ops::Deref;
use std::sync::LazyLock;

use dom_struct::dom_struct;
use embedder_traits::{EmbedderMsg, ProtocolHandlerUpdateRegistration, RegisterOrUnregister};
use headers::HeaderMap;
use http::header::{self, HeaderValue};
use js::rust::MutableHandleValue;
use net_traits::blob_url_store::UrlWithBlobClaim;
use net_traits::request::{
    CredentialsMode, Destination, RequestBuilder, RequestId, RequestMode,
    is_cors_safelisted_request_content_type,
};
use net_traits::{FetchMetadata, NetworkError, ResourceFetchTiming};
use regex::Regex;
#[cfg(feature = "gamepad")]
use script_bindings::cell::DomRefCell;
use script_bindings::reflector::{Reflector, reflect_dom_object};
use servo_base::generic_channel;
use servo_config::pref;
use servo_url::ServoUrl;

use crate::body::Extractable;
use crate::dom::bindings::codegen::Bindings::NavigatorBinding::NavigatorMethods;
use crate::dom::bindings::codegen::Bindings::WindowBinding::Window_Binding::WindowMethods;
use crate::dom::bindings::codegen::Bindings::XMLHttpRequestBinding::BodyInit;
use crate::dom::bindings::error::{Error, Fallible};
use crate::dom::bindings::refcounted::Trusted;
use crate::dom::bindings::reflector::DomGlobal;
use crate::dom::bindings::root::{DomRoot, MutNullableDom};
use crate::dom::bindings::str::{DOMString, USVString};
use crate::dom::bindings::utils::to_frozen_array;
#[cfg(feature = "bluetooth")]
use crate::dom::bluetooth::Bluetooth;
use crate::dom::clipboard::Clipboard;
use crate::dom::credentialmanagement::credentialscontainer::CredentialsContainer;
use crate::dom::csp::{GlobalCspReporting, Violation};
#[cfg(feature = "gamepad")]
use crate::dom::gamepad::Gamepad;
use crate::dom::geolocation::Geolocation;
use crate::dom::globalscope::GlobalScope;
use crate::dom::mediadevices::MediaDevices;
use crate::dom::mediasession::MediaSession;
use crate::dom::mimetypearray::MimeTypeArray;
use crate::dom::navigatorinfo;
use crate::dom::performance::performanceresourcetiming::InitiatorType;
use crate::dom::permissions::Permissions;
use crate::dom::pluginarray::PluginArray;
use crate::dom::serviceworkercontainer::ServiceWorkerContainer;
use crate::dom::servointernals::ServoInternals;
use crate::dom::storagemanager::StorageManager;
use crate::dom::types::UserActivation;
use crate::dom::wakelock::WakeLock;
#[cfg(feature = "webgpu")]
use crate::dom::webgpu::gpu::GPU;
use crate::dom::window::Window;
#[cfg(feature = "webxr")]
use crate::dom::xrsystem::XRSystem;
use crate::fetch::RequestWithGlobalScope;
use crate::network_listener::{FetchResponseListener, ResourceTimingListener, submit_timing};
use crate::script_runtime::CanGc;

pub(super) fn hardware_concurrency() -> u64 {
    static CPUS: LazyLock<u64> = LazyLock::new(|| num_cpus::get().try_into().unwrap_or(1));

    *CPUS
}

/// <https://html.spec.whatwg.org/multipage/#safelisted-scheme>
static SAFELISTED_SCHEMES: [&str; 24] = [
    "bitcoin",
    "ftp",
    "ftps",
    "geo",
    "im",
    "irc",
    "ircs",
    "magnet",
    "mailto",
    "matrix",
    "mms",
    "news",
    "nntp",
    "openpgp4fpr",
    "sftp",
    "sip",
    "sms",
    "smsto",
    "ssh",
    "tel",
    "urn",
    "webcal",
    "wtai",
    "xmpp",
];

/// Used in <https://html.spec.whatwg.org/multipage/#normalize-protocol-handler-parameters>
fn matches_web_plus_protocol(scheme: &str) -> bool {
    static WEB_PLUS_SCHEME_GRAMMAR: LazyLock<Regex> =
        LazyLock::new(|| Regex::new(r#"^web\+[a-z]+$"#).unwrap());

    WEB_PLUS_SCHEME_GRAMMAR.is_match(scheme)
}

#[dom_struct]
pub(crate) struct Navigator {
    reflector_: Reflector,
    #[cfg(feature = "bluetooth")]
    bluetooth: MutNullableDom<Bluetooth>,
    credentials: MutNullableDom<CredentialsContainer>,
    plugins: MutNullableDom<PluginArray>,
    mime_types: MutNullableDom<MimeTypeArray>,
    service_worker: MutNullableDom<ServiceWorkerContainer>,
    #[cfg(feature = "webxr")]
    xr: MutNullableDom<XRSystem>,
    mediadevices: MutNullableDom<MediaDevices>,
    /// <https://www.w3.org/TR/gamepad/#dfn-gamepads>
    #[cfg(feature = "gamepad")]
    gamepads: DomRefCell<Vec<MutNullableDom<Gamepad>>>,
    permissions: MutNullableDom<Permissions>,
    mediasession: MutNullableDom<MediaSession>,
    clipboard: MutNullableDom<Clipboard>,
    storage: MutNullableDom<StorageManager>,
    #[cfg(feature = "webgpu")]
    gpu: MutNullableDom<GPU>,
    /// <https://www.w3.org/TR/gamepad/#dfn-hasgamepadgesture>
    #[cfg(feature = "gamepad")]
    has_gamepad_gesture: Cell<bool>,
    servo_internals: MutNullableDom<ServoInternals>,
    user_activation: MutNullableDom<UserActivation>,
    wake_lock: MutNullableDom<WakeLock>,
}

impl Navigator {
    fn new_inherited() -> Navigator {
        Navigator {
            reflector_: Reflector::new(),
            #[cfg(feature = "bluetooth")]
            bluetooth: Default::default(),
            credentials: Default::default(),
            plugins: Default::default(),
            mime_types: Default::default(),
            service_worker: Default::default(),
            #[cfg(feature = "webxr")]
            xr: Default::default(),
            mediadevices: Default::default(),
            #[cfg(feature = "gamepad")]
            gamepads: Default::default(),
            permissions: Default::default(),
            mediasession: Default::default(),
            clipboard: Default::default(),
            storage: Default::default(),
            #[cfg(feature = "webgpu")]
            gpu: Default::default(),
            #[cfg(feature = "gamepad")]
            has_gamepad_gesture: Cell::new(false),
            servo_internals: Default::default(),
            user_activation: Default::default(),
            wake_lock: Default::default(),
        }
    }

    pub(crate) fn new(window: &Window, can_gc: CanGc) -> DomRoot<Navigator> {
        reflect_dom_object(Box::new(Navigator::new_inherited()), window, can_gc)
    }

    #[cfg(feature = "webxr")]
    pub(crate) fn xr(&self) -> Option<DomRoot<XRSystem>> {
        self.xr.get()
    }

    #[cfg(feature = "gamepad")]
    pub(crate) fn get_gamepad(&self, index: usize) -> Option<DomRoot<Gamepad>> {
        self.gamepads.borrow().get(index).and_then(|g| g.get())
    }

    #[cfg(feature = "gamepad")]
    pub(crate) fn set_gamepad(&self, index: usize, gamepad: Option<&Gamepad>) {
        if let Some(gamepad_to_set) = self.gamepads.borrow().get(index) {
            gamepad_to_set.set(gamepad);
        }
    }

    /// <https://www.w3.org/TR/gamepad/#dfn-selecting-an-unused-gamepad-index>
    #[cfg(feature = "gamepad")]
    pub(crate) fn select_gamepad_index(&self) -> u32 {
        let mut gamepad_list = self.gamepads.borrow_mut();
        if let Some(index) = gamepad_list.iter().position(|g| g.get().is_none()) {
            index as u32
        } else {
            let len = gamepad_list.len();
            gamepad_list.resize_with(len + 1, Default::default);
            len as u32
        }
    }

    /// Step 2.6 of <https://www.w3.org/TR/gamepad/#dfn-gamepaddisconnected>
    #[cfg(feature = "gamepad")]
    pub(crate) fn shrink_gamepads_list(&self) {
        let mut gamepad_list = self.gamepads.borrow_mut();
        for i in (0..gamepad_list.len()).rev() {
            if gamepad_list.get(i).is_none() {
                gamepad_list.remove(i);
            } else {
                break;
            }
        }
    }

    #[cfg(feature = "gamepad")]
    pub(crate) fn get_connected_gamepad(&self) -> Vec<DomRoot<Gamepad>> {
        self.gamepads
            .borrow()
            .iter()
            .filter_map(|gamepad| gamepad.get())
            .filter(|gamepad| gamepad.connected())
            .collect()
    }

    #[cfg(feature = "gamepad")]
    pub(crate) fn has_gamepad_gesture(&self) -> bool {
        self.has_gamepad_gesture.get()
    }

    #[cfg(feature = "gamepad")]
    pub(crate) fn set_has_gamepad_gesture(&self, has_gamepad_gesture: bool) {
        self.has_gamepad_gesture.set(has_gamepad_gesture);
    }

    /// <https://html.spec.whatwg.org/multipage/#normalize-protocol-handler-parameters>
    fn normalize_protocol_handler_parameters(
        &self,
        scheme: DOMString,
        url: USVString,
    ) -> Fallible<(String, ServoUrl)> {
        // Step 1. Set scheme to scheme, converted to ASCII lowercase.
        let scheme = scheme.to_ascii_lowercase();
        // Step 2. If scheme is neither a safelisted scheme nor
        // a string starting with "web+" followed by one or more ASCII lower alphas, then throw a "SecurityError" DOMException.
        if !SAFELISTED_SCHEMES.contains(&scheme.as_ref()) && !matches_web_plus_protocol(&scheme) {
            return Err(Error::Security(None));
        }
        // Step 3. If url does not contain "%s", then throw a "SyntaxError" DOMException.
        if !url.contains("%s") {
            return Err(Error::Syntax(Some(
                "Missing replacement string %s in URL".to_owned(),
            )));
        }
        // Step 4. Let urlRecord be the result of encoding-parsing a URL given url, relative to environment.
        let environment = self.global();
        // Navigator is only exposed on Window, so this is safe to do
        let window = environment.as_window();
        let Ok(url) = window.Document().encoding_parse_a_url(&url) else {
            // Step 5. If urlRecord is failure, then throw a "SyntaxError" DOMException.
            return Err(Error::Syntax(Some("Cannot parse URL".to_owned())));
        };
        // Step 6. If urlRecord's scheme is not an HTTP(S) scheme or urlRecord's origin
        // is not same origin with environment's origin, then throw a "SecurityError" DOMException.
        if !matches!(url.scheme(), "http" | "https") {
            return Err(Error::Security(None));
        }
        let environment_origin = environment.origin().immutable().clone();
        if url.origin() != environment_origin {
            return Err(Error::Security(None));
        }
        // Step 7. Assert: the result of Is url potentially trustworthy? given urlRecord is "Potentially Trustworthy".
        assert!(url.is_potentially_trustworthy());
        // Step 8. Return (scheme, urlRecord).
        Ok((scheme, url))
    }

    fn send_protocol_update_registration_to_embedder(
        &self,
        registration: ProtocolHandlerUpdateRegistration,
    ) {
        let global = self.global();
        let window = global.as_window();
        let (sender, _) = generic_channel::channel().unwrap();
        let _ = global
            .script_to_embedder_chan()
            .send(EmbedderMsg::AllowProtocolHandlerRequest(
                window.webview_id(),
                registration,
                sender,
            ));
    }
}

impl NavigatorMethods<crate::DomTypeHolder> for Navigator {
    /// <https://html.spec.whatwg.org/multipage/#dom-navigator-product>
    fn Product(&self) -> DOMString {
        navigatorinfo::Product()
    }

    /// <https://html.spec.whatwg.org/multipage/#dom-navigator-productsub>
    fn ProductSub(&self) -> DOMString {
        navigatorinfo::ProductSub()
    }

    /// <https://html.spec.whatwg.org/multipage/#dom-navigator-vendor>
    fn Vendor(&self) -> DOMString {
        navigatorinfo::Vendor()
    }

    /// <https://html.spec.whatwg.org/multipage/#dom-navigator-vendorsub>
    fn VendorSub(&self) -> DOMString {
        navigatorinfo::VendorSub()
    }

    /// <https://html.spec.whatwg.org/multipage/#dom-navigator-taintenabled>
    fn TaintEnabled(&self) -> bool {
        navigatorinfo::TaintEnabled()
    }

    /// <https://html.spec.whatwg.org/multipage/#dom-navigator-appname>
    fn AppName(&self) -> DOMString {
        navigatorinfo::AppName()
    }

    /// <https://html.spec.whatwg.org/multipage/#dom-navigator-appcodename>
    fn AppCodeName(&self) -> DOMString {
        navigatorinfo::AppCodeName()
    }

    /// <https://html.spec.whatwg.org/multipage/#dom-navigator-platform>
    fn Platform(&self) -> DOMString {
        navigatorinfo::Platform()
    }

    /// <https://html.spec.whatwg.org/multipage/#dom-navigator-useragent>
    fn UserAgent(&self) -> DOMString {
        navigatorinfo::UserAgent(&pref!(user_agent))
    }

    /// <https://html.spec.whatwg.org/multipage/#dom-navigator-appversion>
    fn AppVersion(&self) -> DOMString {
        navigatorinfo::AppVersion()
    }

    // https://webbluetoothcg.github.io/web-bluetooth/#dom-navigator-bluetooth
    #[cfg(feature = "bluetooth")]
    fn Bluetooth(&self, cx: &mut js::context::JSContext) -> DomRoot<Bluetooth> {
        self.bluetooth
            .or_init(|| Bluetooth::new(cx, &self.global()))
    }

    /// <https://www.w3.org/TR/credential-management-1/#framework-credential-management>
    fn Credentials(&self) -> DomRoot<CredentialsContainer> {
        self.credentials
            .or_init(|| CredentialsContainer::new(&self.global(), CanGc::deprecated_note()))
    }

    /// <https://www.w3.org/TR/geolocation/#navigator_interface>
    fn Geolocation(&self) -> DomRoot<Geolocation> {
        Geolocation::new(&self.global(), CanGc::deprecated_note())
    }

    /// <https://html.spec.whatwg.org/multipage/#navigatorlanguage>
    fn Language(&self) -> DOMString {
        navigatorinfo::Language()
    }

    // https://html.spec.whatwg.org/multipage/#dom-navigator-languages
    fn Languages(&self, cx: &mut js::context::JSContext, retval: MutableHandleValue) {
        to_frozen_array(&[self.Language()], cx.into(), retval, CanGc::from_cx(cx))
    }

    /// <https://html.spec.whatwg.org/multipage/#dom-navigator-online>
    fn OnLine(&self) -> bool {
        true
    }

    /// <https://html.spec.whatwg.org/multipage/#dom-navigator-plugins>
    fn Plugins(&self) -> DomRoot<PluginArray> {
        self.plugins
            .or_init(|| PluginArray::new(&self.global(), CanGc::deprecated_note()))
    }

    /// <https://html.spec.whatwg.org/multipage/#dom-navigator-mimetypes>
    fn MimeTypes(&self) -> DomRoot<MimeTypeArray> {
        self.mime_types
            .or_init(|| MimeTypeArray::new(&self.global(), CanGc::deprecated_note()))
    }

    /// <https://html.spec.whatwg.org/multipage/#dom-navigator-javaenabled>
    fn JavaEnabled(&self) -> bool {
        false
    }

    /// <https://html.spec.whatwg.org/multipage/#dom-navigator-pdfviewerenabled>
    fn PdfViewerEnabled(&self) -> bool {
        false
    }

    /// <https://w3c.github.io/ServiceWorker/#navigator-service-worker-attribute>
    fn ServiceWorker(&self, cx: &mut js::context::JSContext) -> DomRoot<ServiceWorkerContainer> {
        self.service_worker
            .or_init(|| ServiceWorkerContainer::new(cx, &self.global()))
    }

    /// <https://html.spec.whatwg.org/multipage/#dom-navigator-cookieenabled>
    fn CookieEnabled(&self) -> bool {
        true
    }

    /// <https://www.w3.org/TR/gamepad/#dom-navigator-getgamepads>
    #[cfg(feature = "gamepad")]
    fn GetGamepads(&self) -> Vec<Option<DomRoot<Gamepad>>> {
        use script_bindings::codegen::GenericBindings::PerformanceBinding::PerformanceMethods;

        // Step 1. Let doc be the current global object's associated Document.
        let global = self.global();
        let window = global.as_window();
        let doc = window.Document();

        // Step 2. If doc is null or doc is not fully active, then return an empty list.
        // TODO Step 3. If doc is not allowed to use the "gamepad" permission,
        //         then throw a "SecurityError" DOMException.
        // Step 4. If this.[[hasGamepadGesture]] is false, then return an empty list.
        if !doc.is_fully_active() || !self.has_gamepad_gesture.get() {
            return Vec::new();
        }

        // Step 5. Let now be the current high resolution time given the current global object.
        let now = *window.Performance().Now();

        // Step 6. Let gamepads be an empty list.
        // Step 7. For each gamepad of this.[[gamepads]]:
        self.gamepads
            .borrow()
            .iter()
            .map(|slot| {
                slot.get().inspect(|gamepad| {
                    // Step 7.1. If gamepad is not null and gamepad.[[exposed]] is false:
                    if !gamepad.exposed() {
                        // Step 7.1.1. Set gamepad.[[exposed]] to true.
                        gamepad.set_exposed(true);
                        // Step 7.1.2. Set gamepad.[[timestamp]] to now.
                        gamepad.update_timestamp(now);
                    }
                })
            })
            .collect() // Step 7.2. Append gamepad to gamepads.
        // Step 8. Return gamepads.
    }
    /// <https://w3c.github.io/permissions/#navigator-and-workernavigator-extension>
    fn Permissions(&self) -> DomRoot<Permissions> {
        self.permissions
            .or_init(|| Permissions::new(&self.global(), CanGc::deprecated_note()))
    }

    /// <https://immersive-web.github.io/webxr/#dom-navigator-xr>
    #[cfg(feature = "webxr")]
    fn Xr(&self) -> DomRoot<XRSystem> {
        self.xr
            .or_init(|| XRSystem::new(self.global().as_window(), CanGc::deprecated_note()))
    }

    /// <https://w3c.github.io/mediacapture-main/#dom-navigator-mediadevices>
    fn MediaDevices(&self) -> DomRoot<MediaDevices> {
        self.mediadevices
            .or_init(|| MediaDevices::new(&self.global(), CanGc::deprecated_note()))
    }

    /// <https://w3c.github.io/mediasession/#dom-navigator-mediasession>
    fn MediaSession(&self) -> DomRoot<MediaSession> {
        self.mediasession.or_init(|| {
            // There is a single MediaSession instance per Pipeline
            // and only one active MediaSession globally.
            //
            // MediaSession creation can happen in two cases:
            //
            // - If content gets `navigator.mediaSession`
            // - If a media instance (HTMLMediaElement so far) starts playing media.
            let global = self.global();
            let window = global.as_window();
            MediaSession::new(window, CanGc::deprecated_note())
        })
    }

    // https://gpuweb.github.io/gpuweb/#dom-navigator-gpu
    #[cfg(feature = "webgpu")]
    fn Gpu(&self) -> DomRoot<GPU> {
        self.gpu
            .or_init(|| GPU::new(&self.global(), CanGc::deprecated_note()))
    }

    /// <https://html.spec.whatwg.org/multipage/#dom-navigator-hardwareconcurrency>
    fn HardwareConcurrency(&self) -> u64 {
        hardware_concurrency()
    }

    /// <https://w3c.github.io/clipboard-apis/#h-navigator-clipboard>
    fn Clipboard(&self, cx: &mut js::context::JSContext) -> DomRoot<Clipboard> {
        self.clipboard
            .or_init(|| Clipboard::new(cx, &self.global()))
    }

    /// <https://storage.spec.whatwg.org/#api>
    fn Storage(&self, cx: &mut js::context::JSContext) -> DomRoot<StorageManager> {
        self.storage
            .or_init(|| StorageManager::new(&self.global(), CanGc::from_cx(cx)))
    }

    /// <https://w3c.github.io/beacon/#sec-processing-model>
    fn SendBeacon(
        &self,
        cx: &mut js::context::JSContext,
        url: USVString,
        data: Option<BodyInit>,
    ) -> Fallible<bool> {
        let global = self.global();
        // Step 1. Set base to this's relevant settings object's API base URL.
        let base = global.api_base_url();
        // Step 2. Set origin to this's relevant settings object's origin.
        //
        // Handled in `crate::fetch::RequestWithGlobalScope::with_global_scope`

        // Step 3. Set parsedUrl to the result of the URL parser steps with url and base.
        // If the algorithm returns an error, or if parsedUrl's scheme is not "http" or "https",
        // throw a "TypeError" exception and terminate these steps.
        let Ok(url) = ServoUrl::parse_with_base(Some(&base), &url) else {
            return Err(Error::Type(c"Cannot parse URL".to_owned()));
        };
        if !matches!(url.scheme(), "http" | "https") {
            return Err(Error::Type(c"URL is not http(s)".to_owned()));
        }
        let mut request_body = None;
        // Step 4. Let headerList be an empty list.
        let mut headers = HeaderMap::with_capacity(1);
        // Step 5. Let corsMode be "no-cors".
        let mut cors_mode = RequestMode::NoCors;
        // Step 6. If data is not null:
        if let Some(data) = data {
            // Step 6.1. Set transmittedData and contentType to the result of extracting data's byte stream
            // with the keepalive flag set.
            let extracted_body = data.extract(cx, &global, true)?;
            // Step 6.2. If the amount of data that can be queued to be sent by keepalive enabled requests
            // is exceeded by the size of transmittedData (as defined in HTTP-network-or-cache fetch),
            // set the return value to false and terminate these steps.
            if let Some(total_bytes) = extracted_body.total_bytes {
                let in_flight_keep_alive_bytes =
                    global.total_size_of_in_flight_keep_alive_records();
                if total_bytes as u64 + in_flight_keep_alive_bytes > 64 * 1024 {
                    return Ok(false);
                }
            }
            // Step 6.3. If contentType is not null:
            if let Some(content_type) = extracted_body.content_type.as_ref() {
                // Set corsMode to "cors".
                cors_mode = RequestMode::CorsMode;
                // If contentType value is a CORS-safelisted request-header value for the Content-Type header,
                // set corsMode to "no-cors".
                if is_cors_safelisted_request_content_type(content_type.as_bytes().deref()) {
                    cors_mode = RequestMode::NoCors;
                }
                // Append a Content-Type header with value contentType to headerList.
                //
                // We cannot use typed header insertion with `mime::Mime` parsing here,
                // since it lowercases `charset=UTF-8`: https://github.com/hyperium/mime/issues/116
                headers.insert(
                    header::CONTENT_TYPE,
                    HeaderValue::from_str(&content_type.str()).unwrap(),
                );
            }
            request_body = Some(extracted_body.into_net_request_body().0);
        }
        // Step 7.1. Let req be a new request, initialized as follows:
        let request = RequestBuilder::new(
            None,
            UrlWithBlobClaim::from_url_without_having_claimed_blob(url.clone()),
            global.get_referrer(),
        )
        .mode(cors_mode)
        .destination(Destination::None)
        .with_global_scope(&global)
        .method(http::Method::POST)
        .body(request_body)
        .keep_alive(true)
        .credentials_mode(CredentialsMode::Include)
        .headers(headers);
        // Step 7.2. Fetch req.
        global.fetch(
            request,
            BeaconFetchListener {
                url,
                global: Trusted::new(&global),
            },
            global.task_manager().networking_task_source().into(),
        );
        // Step 7. Set the return value to true, return the sendBeacon() call,
        // and continue to run the following steps in parallel:
        Ok(true)
    }

    /// <https://servo.org/internal-no-spec>
    fn Servo(&self) -> DomRoot<ServoInternals> {
        self.servo_internals
            .or_init(|| ServoInternals::new(&self.global(), CanGc::deprecated_note()))
    }

    /// <https://html.spec.whatwg.org/multipage/#dom-navigator-registerprotocolhandler>
    fn RegisterProtocolHandler(&self, scheme: DOMString, url: USVString) -> Fallible<()> {
        // Step 1. Let (normalizedScheme, normalizedURLString) be the result of
        // running normalize protocol handler parameters with scheme, url, and this's relevant settings object.
        let (scheme, url) = self.normalize_protocol_handler_parameters(scheme, url)?;
        // Step 2. In parallel: register a protocol handler for normalizedScheme and normalizedURLString.
        // User agents may, within the constraints described, do whatever they like. A user agent could,
        // for instance, prompt the user and offer the user the opportunity to add the site to a shortlist of handlers,
        // or make the handlers their default, or cancel the request. User agents could also silently collect the information,
        // providing it only when relevant to the user.
        // User agents should keep track of which sites have registered handlers (even if the user has declined such registrations)
        // so that the user is not repeatedly prompted with the same request.
        // If the registerProtocolHandler() automation mode of this's relevant global object's associated Document is not "none",
        // the user agent should first verify that it is in an automation context (see WebDriver's security considerations).
        // The user agent should then bypass the above communication of information and gathering of user consent,
        // and instead do the following based on the value of the registerProtocolHandler() automation mode:
        self.send_protocol_update_registration_to_embedder(ProtocolHandlerUpdateRegistration {
            scheme,
            url,
            register_or_unregister: RegisterOrUnregister::Register,
        });
        Ok(())
    }

    /// <https://html.spec.whatwg.org/multipage/#dom-navigator-unregisterprotocolhandler>
    fn UnregisterProtocolHandler(&self, scheme: DOMString, url: USVString) -> Fallible<()> {
        // Step 1. Let (normalizedScheme, normalizedURLString) be the result of
        // running normalize protocol handler parameters with scheme, url, and this's relevant settings object.
        let (scheme, url) = self.normalize_protocol_handler_parameters(scheme, url)?;
        // Step 2. In parallel: unregister the handler described by normalizedScheme and normalizedURLString.
        self.send_protocol_update_registration_to_embedder(ProtocolHandlerUpdateRegistration {
            scheme,
            url,
            register_or_unregister: RegisterOrUnregister::Unregister,
        });
        Ok(())
    }

    /// <https://html.spec.whatwg.org/multipage/#dom-navigator-useractivation>
    fn UserActivation(&self, cx: &mut js::context::JSContext) -> DomRoot<UserActivation> {
        self.user_activation
            .or_init(|| UserActivation::new(cx, &self.global()))
    }

    /// <https://w3c.github.io/screen-wake-lock/#dom-navigator-wakelock>
    fn WakeLock(&self, cx: &mut js::context::JSContext) -> DomRoot<WakeLock> {
        self.wake_lock.or_init(|| WakeLock::new(cx, &self.global()))
    }
}

struct BeaconFetchListener {
    /// URL of this request.
    url: ServoUrl,
    /// The global object fetching the report uri violation
    global: Trusted<GlobalScope>,
}

impl FetchResponseListener for BeaconFetchListener {
    fn process_request_body(&mut self, _: RequestId) {}

    fn process_response(
        &mut self,
        _: &mut js::context::JSContext,
        _: RequestId,
        fetch_metadata: Result<FetchMetadata, NetworkError>,
    ) {
        _ = fetch_metadata;
    }

    fn process_response_chunk(
        &mut self,
        _: &mut js::context::JSContext,
        _: RequestId,
        chunk: Vec<u8>,
    ) {
        _ = chunk;
    }

    fn process_response_eof(
        self,
        cx: &mut js::context::JSContext,
        _: RequestId,
        response: Result<(), NetworkError>,
        timing: ResourceFetchTiming,
    ) {
        submit_timing(cx, &self, &response, &timing);
    }

    fn process_csp_violations(&mut self, _request_id: RequestId, violations: Vec<Violation>) {
        let global = self.resource_timing_global();
        global.report_csp_violations(violations, None, None);
    }
}

impl ResourceTimingListener for BeaconFetchListener {
    fn resource_timing_information(&self) -> (InitiatorType, ServoUrl) {
        (InitiatorType::Beacon, self.url.clone())
    }

    fn resource_timing_global(&self) -> DomRoot<GlobalScope> {
        self.global.root()
    }
}