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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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 http://mozilla.org/MPL/2.0/. */
#include "mozilla/dom/JSValidatorChild.h"
#include "mozilla/ipc/Endpoint.h"
using namespace mozilla::dom;
mozilla::ipc::IPCResult JSValidatorChild::RecvIsOpaqueResponseAllowed(
IsOpaqueResponseAllowedResolver&& aResolver) {
mResolver.emplace(aResolver);
return IPC_OK();
}
mozilla::ipc::IPCResult JSValidatorChild::RecvOnDataAvailable(Shmem&& aData) {
MOZ_ASSERT(mResolver);
if (!mSourceBytes.Append(Span(aData.get<char>(), aData.Size<char>()),
mozilla::fallible)) {
// To prevent an attacker from flood the validation process,
// we don't validate here.
Resolve(false);
}
DeallocShmem(aData);
return IPC_OK();
}
mozilla::ipc::IPCResult JSValidatorChild::RecvOnStopRequest(
const nsresult& aReason) {
if (!mResolver) {
return IPC_OK();
}
if (NS_FAILED(aReason)) {
Resolve(false);
} else {
Resolve(ShouldAllowJS());
}
return IPC_OK();
}
void JSValidatorChild::ActorDestroy(ActorDestroyReason aReason) {
if (mResolver) {
Resolve(false);
}
};
void JSValidatorChild::Resolve(bool aAllow) {
MOZ_ASSERT(mResolver);
Maybe<Shmem> data = Nothing();
if (aAllow) {
if (!mSourceBytes.IsEmpty()) {
Shmem sharedData;
nsresult rv =
JSValidatorUtils::CopyCStringToShmem(this, mSourceBytes, sharedData);
if (NS_SUCCEEDED(rv)) {
data = Some(std::move(sharedData));
}
}
}
mResolver.ref()(
Tuple<const bool&, mozilla::Maybe<Shmem>&&>(aAllow, std::move(data)));
mResolver = Nothing();
}
bool JSValidatorChild::ShouldAllowJS() const {
// mSourceBytes could be empty when
// 1. No OnDataAvailable calls
// 2. Failed to allocate shmem
//
// TODO(sefeng): THIS IS A VERY TEMPORARY SOLUTION
return !mSourceBytes.IsEmpty()
? !StringBeginsWith(NS_ConvertUTF8toUTF16(mSourceBytes), u"{"_ns)
: true;
}
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