servo/components/devtools/actors/watcher/target_configuration.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/. */

//! Liberally derived from <https://searchfox.org/mozilla-central/source/devtools/server/actors/target-configuration.js>
//! This actor manages the configuration flags that the devtools host can apply to the targets.

use std::collections::HashMap;

use embedder_traits::Theme;
use log::warn;
use malloc_size_of_derive::MallocSizeOf;
use serde::Serialize;
use serde_json::{Map, Value};

use crate::actor::{Actor, ActorEncode, ActorError, ActorRegistry};
use crate::actors::browsing_context::BrowsingContextActor;
use crate::actors::tab::TabDescriptorActor;
use crate::protocol::ClientRequest;
use crate::{EmptyReplyMsg, RootActor, StreamId};

#[derive(Serialize)]
#[serde(rename_all = "camelCase")]
pub(crate) struct TargetConfigurationTraits {
    supported_options: HashMap<&'static str, bool>,
}

#[derive(Serialize)]
pub(crate) struct TargetConfigurationActorMsg {
    actor: String,
    configuration: HashMap<&'static str, bool>,
    traits: TargetConfigurationTraits,
}

#[derive(MallocSizeOf)]
pub(crate) struct TargetConfigurationActor {
    name: String,
    configuration: HashMap<&'static str, bool>,
    supported_options: HashMap<&'static str, bool>,
}

#[derive(Serialize)]
#[serde(rename_all = "camelCase")]
struct JavascriptEnabledReply {
    from: String,
    javascript_enabled: bool,
}

impl Actor for TargetConfigurationActor {
    fn name(&self) -> String {
        self.name.clone()
    }

    /// The target configuration actor can handle the following messages:
    ///
    /// - `updateConfiguration`: Receives new configuration flags from the devtools host.
    fn handle_message(
        &self,
        request: ClientRequest,
        registry: &ActorRegistry,
        msg_type: &str,
        msg: &Map<String, Value>,
        _id: StreamId,
    ) -> Result<(), ActorError> {
        match msg_type {
            "updateConfiguration" => {
                let config = msg
                    .get("configuration")
                    .ok_or(ActorError::MissingParameter)?
                    .as_object()
                    .ok_or(ActorError::BadParameterType)?;
                if let Some(scheme) = config.get("colorSchemeSimulation").and_then(|v| v.as_str()) {
                    let theme = match scheme {
                        "dark" => Theme::Dark,
                        "light" => Theme::Light,
                        _ => Theme::Light,
                    };
                    let root_actor = registry.find::<RootActor>("root");
                    if let Some(tab_name) = root_actor.active_tab() {
                        let tab_actor = registry.find::<TabDescriptorActor>(&tab_name);
                        let browsing_context_name = tab_actor.browsing_context();
                        let browsing_context_actor =
                            registry.find::<BrowsingContextActor>(&browsing_context_name);
                        browsing_context_actor
                            .simulate_color_scheme(theme)
                            .map_err(|_| ActorError::Internal)?;
                    } else {
                        warn!("No active tab for updateConfiguration");
                    }
                }
                let msg = EmptyReplyMsg { from: self.name() };
                request.reply_final(&msg)?
            },
            "isJavascriptEnabled" => {
                let msg = JavascriptEnabledReply {
                    from: self.name(),
                    javascript_enabled: true,
                };
                request.reply_final(&msg)?
            },
            _ => return Err(ActorError::UnrecognizedPacketType),
        };
        Ok(())
    }
}

impl TargetConfigurationActor {
    pub fn new(name: String) -> Self {
        Self {
            name,
            configuration: HashMap::new(),
            supported_options: HashMap::from([
                ("cacheDisabled", false),
                ("colorSchemeSimulation", true),
                ("customFormatters", false),
                ("customUserAgent", false),
                ("javascriptEnabled", false),
                ("overrideDPPX", false),
                ("printSimulationEnabled", false),
                ("rdmPaneMaxTouchPoints", false),
                ("rdmPaneOrientation", false),
                ("recordAllocations", false),
                ("reloadOnTouchSimulationToggle", false),
                ("restoreFocus", false),
                ("serviceWorkersTestingEnabled", false),
                ("setTabOffline", false),
                ("touchEventsOverride", false),
                ("tracerOptions", false),
                ("useSimpleHighlightersForReducedMotion", false),
            ]),
        }
    }
}

impl ActorEncode<TargetConfigurationActorMsg> for TargetConfigurationActor {
    fn encode(&self, _: &ActorRegistry) -> TargetConfigurationActorMsg {
        TargetConfigurationActorMsg {
            actor: self.name(),
            configuration: self.configuration.clone(),
            traits: TargetConfigurationTraits {
                supported_options: self.supported_options.clone(),
            },
        }
    }
}