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/* 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 dom_struct::dom_struct;
use js::jsapi::{JSObject, Type};
use js::rust::CustomAutoRooterGuard;
use js::typedarray::{ArrayBufferView, ArrayBufferViewU8, TypedArray};
use servo_rand::{RngCore, ServoRng};
use crate::dom::bindings::cell::DomRefCell;
use crate::dom::bindings::codegen::Bindings::CryptoBinding::CryptoMethods;
use crate::dom::bindings::error::{Error, Fallible};
use crate::dom::bindings::reflector::{reflect_dom_object, Reflector};
use crate::dom::bindings::root::DomRoot;
use crate::dom::globalscope::GlobalScope;
use crate::script_runtime::JSContext;
// https://developer.mozilla.org/en-US/docs/Web/API/Crypto
#[dom_struct]
pub struct Crypto {
reflector_: Reflector,
#[ignore_malloc_size_of = "Defined in rand"]
#[no_trace]
rng: DomRefCell<ServoRng>,
}
impl Crypto {
fn new_inherited() -> Crypto {
Crypto {
reflector_: Reflector::new(),
rng: DomRefCell::new(ServoRng::default()),
}
}
pub fn new(global: &GlobalScope) -> DomRoot<Crypto> {
reflect_dom_object(Box::new(Crypto::new_inherited()), global)
}
}
impl CryptoMethods for Crypto {
#[allow(unsafe_code)]
// https://dvcs.w3.org/hg/webcrypto-api/raw-file/tip/spec/Overview.html#Crypto-method-getRandomValues
fn GetRandomValues(
&self,
_cx: JSContext,
mut input: CustomAutoRooterGuard<ArrayBufferView>,
) -> Fallible<ArrayBufferView> {
let array_type = input.get_array_type();
if !is_integer_buffer(array_type) {
Err(Error::TypeMismatch)
} else {
let data = unsafe { input.as_mut_slice() };
if data.len() > 65536 {
return Err(Error::QuotaExceeded);
}
self.rng.borrow_mut().fill_bytes(data);
let underlying_object = unsafe { input.underlying_object() };
TypedArray::<ArrayBufferViewU8, *mut JSObject>::from(*underlying_object)
.map_err(|_| Error::JSFailed)
}
}
}
fn is_integer_buffer(array_type: Type) -> bool {
match array_type {
Type::Uint8 |
Type::Uint8Clamped |
Type::Int8 |
Type::Uint16 |
Type::Int16 |
Type::Uint32 |
Type::Int32 => true,
_ => false,
}
}
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