1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
/* 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/. */

use crate::dom::abstractworker::SimpleWorkerErrorHandler;
use crate::dom::bindings::cell::DomRefCell;
use crate::dom::bindings::codegen::Bindings::MessagePortBinding::PostMessageOptions;
use crate::dom::bindings::codegen::Bindings::ServiceWorkerBinding::{
    ServiceWorkerMethods, ServiceWorkerState,
};
use crate::dom::bindings::error::{Error, ErrorResult};
use crate::dom::bindings::inheritance::Castable;
use crate::dom::bindings::refcounted::Trusted;
use crate::dom::bindings::reflector::{reflect_dom_object, DomObject};
use crate::dom::bindings::root::DomRoot;
use crate::dom::bindings::str::USVString;
use crate::dom::bindings::structuredclone;
use crate::dom::bindings::trace::RootedTraceableBox;
use crate::dom::eventtarget::EventTarget;
use crate::dom::globalscope::GlobalScope;
use crate::script_runtime::JSContext;
use crate::task::TaskOnce;
use dom_struct::dom_struct;
use js::jsapi::{Heap, JSObject};
use js::rust::{CustomAutoRooter, CustomAutoRooterGuard, HandleValue};
use msg::constellation_msg::ServiceWorkerId;
use script_traits::{DOMMessage, ScriptMsg};
use servo_url::ServoUrl;
use std::cell::Cell;

pub type TrustedServiceWorkerAddress = Trusted<ServiceWorker>;

#[dom_struct]
pub struct ServiceWorker {
    eventtarget: EventTarget,
    script_url: DomRefCell<String>,
    scope_url: ServoUrl,
    state: Cell<ServiceWorkerState>,
    worker_id: ServiceWorkerId,
}

impl ServiceWorker {
    fn new_inherited(
        script_url: &str,
        scope_url: ServoUrl,
        worker_id: ServiceWorkerId,
    ) -> ServiceWorker {
        ServiceWorker {
            eventtarget: EventTarget::new_inherited(),
            script_url: DomRefCell::new(String::from(script_url)),
            state: Cell::new(ServiceWorkerState::Installing),
            scope_url: scope_url,
            worker_id,
        }
    }

    pub fn new(
        global: &GlobalScope,
        script_url: ServoUrl,
        scope_url: ServoUrl,
        worker_id: ServiceWorkerId,
    ) -> DomRoot<ServiceWorker> {
        reflect_dom_object(
            Box::new(ServiceWorker::new_inherited(
                script_url.as_str(),
                scope_url,
                worker_id,
            )),
            global,
        )
    }

    pub fn dispatch_simple_error(address: TrustedServiceWorkerAddress) {
        let service_worker = address.root();
        service_worker.upcast().fire_event(atom!("error"));
    }

    pub fn set_transition_state(&self, state: ServiceWorkerState) {
        self.state.set(state);
        self.upcast::<EventTarget>()
            .fire_event(atom!("statechange"));
    }

    pub fn get_script_url(&self) -> ServoUrl {
        ServoUrl::parse(&self.script_url.borrow().clone()).unwrap()
    }

    /// https://w3c.github.io/ServiceWorker/#service-worker-postmessage
    fn post_message_impl(
        &self,
        cx: JSContext,
        message: HandleValue,
        transfer: CustomAutoRooterGuard<Vec<*mut JSObject>>,
    ) -> ErrorResult {
        // Step 1
        if let ServiceWorkerState::Redundant = self.state.get() {
            return Err(Error::InvalidState);
        }
        // Step 7
        let data = structuredclone::write(cx, message, Some(transfer))?;
        let incumbent = GlobalScope::incumbent().expect("no incumbent global?");
        let msg_vec = DOMMessage {
            origin: incumbent.origin().immutable().clone(),
            data,
        };
        let _ = self
            .global()
            .script_to_constellation_chan()
            .send(ScriptMsg::ForwardDOMMessage(
                msg_vec,
                self.scope_url.clone(),
            ));
        Ok(())
    }
}

impl ServiceWorkerMethods for ServiceWorker {
    // https://w3c.github.io/ServiceWorker/#service-worker-state-attribute
    fn State(&self) -> ServiceWorkerState {
        self.state.get()
    }

    // https://w3c.github.io/ServiceWorker/#service-worker-url-attribute
    fn ScriptURL(&self) -> USVString {
        USVString(self.script_url.borrow().clone())
    }

    /// https://w3c.github.io/ServiceWorker/#service-worker-postmessage
    fn PostMessage(
        &self,
        cx: JSContext,
        message: HandleValue,
        transfer: CustomAutoRooterGuard<Vec<*mut JSObject>>,
    ) -> ErrorResult {
        self.post_message_impl(cx, message, transfer)
    }

    /// https://w3c.github.io/ServiceWorker/#service-worker-postmessage
    fn PostMessage_(
        &self,
        cx: JSContext,
        message: HandleValue,
        options: RootedTraceableBox<PostMessageOptions>,
    ) -> ErrorResult {
        let mut rooted = CustomAutoRooter::new(
            options
                .transfer
                .iter()
                .map(|js: &RootedTraceableBox<Heap<*mut JSObject>>| js.get())
                .collect(),
        );
        let guard = CustomAutoRooterGuard::new(*cx, &mut rooted);
        self.post_message_impl(cx, message, guard)
    }

    // https://w3c.github.io/ServiceWorker/#service-worker-container-onerror-attribute
    event_handler!(error, GetOnerror, SetOnerror);

    // https://w3c.github.io/ServiceWorker/#ref-for-service-worker-onstatechange-attribute-1
    event_handler!(statechange, GetOnstatechange, SetOnstatechange);
}

impl TaskOnce for SimpleWorkerErrorHandler<ServiceWorker> {
    #[allow(unrooted_must_root)]
    fn run_once(self) {
        ServiceWorker::dispatch_simple_error(self.addr);
    }
}