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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/renderer/modules/push_messaging/push_subscription.h"
#include <memory>
#include "base/numerics/safe_conversions.h"
#include "third_party/blink/renderer/bindings/core/v8/script_promise_resolver.h"
#include "third_party/blink/renderer/bindings/core/v8/v8_object_builder.h"
#include "third_party/blink/renderer/bindings/modules/v8/v8_push_encryption_key_name.h"
#include "third_party/blink/renderer/core/dom/dom_exception.h"
#include "third_party/blink/renderer/modules/push_messaging/push_error.h"
#include "third_party/blink/renderer/modules/push_messaging/push_provider.h"
#include "third_party/blink/renderer/modules/push_messaging/push_subscription_options.h"
#include "third_party/blink/renderer/modules/service_worker/service_worker_registration.h"
#include "third_party/blink/renderer/platform/heap/garbage_collected.h"
#include "third_party/blink/renderer/platform/scheduler/public/thread.h"
#include "third_party/blink/renderer/platform/wtf/text/base64.h"
#include "third_party/blink/renderer/platform/wtf/vector.h"
namespace blink {
namespace {
// This method and its dependencies must remain constant time, thus not branch
// based on the value of |buffer| while encoding, assuming a known length.
String ToBase64URLWithoutPadding(DOMArrayBuffer* buffer) {
String value = WTF::Base64URLEncode(buffer->ByteSpan());
DCHECK_GT(value.length(), 0u);
unsigned padding_to_remove = 0;
for (unsigned position = value.length() - 1; position; --position) {
if (value[position] != '=')
break;
++padding_to_remove;
}
DCHECK_LT(padding_to_remove, 4u);
DCHECK_GT(value.length(), padding_to_remove);
value.Truncate(value.length() - padding_to_remove);
return value;
}
// Converts a {std::optional<base::Time>} into a
// {std::optional<base::DOMTimeStamp>} object.
// base::Time is in milliseconds from Windows epoch (1601-01-01 00:00:00 UTC)
// while blink::DOMTimeStamp is in milliseconds from UNIX epoch (1970-01-01
// 00:00:00 UTC)
std::optional<blink::DOMTimeStamp> ToDOMTimeStamp(
const std::optional<base::Time>& time) {
if (time)
return ConvertSecondsToDOMTimeStamp(time->InSecondsFSinceUnixEpoch());
return std::nullopt;
}
} // namespace
// static
PushSubscription* PushSubscription::Create(
mojom::blink::PushSubscriptionPtr subscription,
ServiceWorkerRegistration* service_worker_registration) {
return MakeGarbageCollected<PushSubscription>(
subscription->endpoint, subscription->options->user_visible_only,
subscription->options->application_server_key, subscription->p256dh,
subscription->auth, ToDOMTimeStamp(subscription->expirationTime),
service_worker_registration);
}
PushSubscription::PushSubscription(
const KURL& endpoint,
bool user_visible_only,
const WTF::Vector<uint8_t>& application_server_key,
const WTF::Vector<unsigned char>& p256dh,
const WTF::Vector<unsigned char>& auth,
const std::optional<DOMTimeStamp>& expiration_time,
ServiceWorkerRegistration* service_worker_registration)
: endpoint_(endpoint),
options_(MakeGarbageCollected<PushSubscriptionOptions>(
user_visible_only,
application_server_key)),
p256dh_(DOMArrayBuffer::Create(p256dh)),
auth_(DOMArrayBuffer::Create(auth)),
expiration_time_(expiration_time),
service_worker_registration_(service_worker_registration) {}
PushSubscription::~PushSubscription() = default;
std::optional<DOMTimeStamp> PushSubscription::expirationTime() const {
// This attribute reflects the time at which the subscription will expire,
// which is not relevant to this implementation yet as subscription refreshes
// are not supported.
return expiration_time_;
}
DOMArrayBuffer* PushSubscription::getKey(
const V8PushEncryptionKeyName& name) const {
switch (name.AsEnum()) {
case V8PushEncryptionKeyName::Enum::kP256Dh:
return p256dh_.Get();
case V8PushEncryptionKeyName::Enum::kAuth:
return auth_.Get();
}
NOTREACHED();
}
ScriptPromise<IDLBoolean> PushSubscription::unsubscribe(
ScriptState* script_state) {
auto* resolver =
MakeGarbageCollected<ScriptPromiseResolver<IDLBoolean>>(script_state);
PushProvider* push_provider =
PushProvider::From(service_worker_registration_);
DCHECK(push_provider);
push_provider->Unsubscribe(resolver);
return resolver->Promise();
}
ScriptObject PushSubscription::toJSONForBinding(ScriptState* script_state) {
DCHECK(p256dh_);
V8ObjectBuilder result(script_state);
result.AddString("endpoint", endpoint().GetString());
if (expiration_time_) {
result.AddNumber("expirationTime", *expiration_time_);
} else {
result.AddNull("expirationTime");
}
V8ObjectBuilder keys(script_state);
keys.AddString("p256dh", ToBase64URLWithoutPadding(p256dh_));
keys.AddString("auth", ToBase64URLWithoutPadding(auth_));
result.Add("keys", keys);
return result.ToScriptObject();
}
void PushSubscription::Trace(Visitor* visitor) const {
visitor->Trace(options_);
visitor->Trace(p256dh_);
visitor->Trace(auth_);
visitor->Trace(service_worker_registration_);
ScriptWrappable::Trace(visitor);
}
} // namespace blink
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