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// Copyright 2015 The Chromium Authors. All rights reserved.
// 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/platform/loader/fetch/client_hints_preferences.h"
#include "base/macros.h"
#include "third_party/blink/public/common/client_hints/client_hints.h"
#include "third_party/blink/renderer/platform/loader/fetch/resource_response.h"
#include "third_party/blink/renderer/platform/network/http_names.h"
#include "third_party/blink/renderer/platform/network/http_parsers.h"
#include "third_party/blink/renderer/platform/runtime_enabled_features.h"
#include "third_party/blink/renderer/platform/weborigin/kurl.h"
namespace blink {
namespace {
void ParseAcceptChHeader(const String& header_value,
WebEnabledClientHints& enabled_hints) {
CommaDelimitedHeaderSet accept_client_hints_header;
ParseCommaDelimitedHeader(header_value, accept_client_hints_header);
for (size_t i = 0;
i < static_cast<int>(mojom::WebClientHintsType::kMaxValue) + 1; ++i) {
enabled_hints.SetIsEnabled(
static_cast<mojom::WebClientHintsType>(i),
accept_client_hints_header.Contains(kClientHintsHeaderMapping[i]));
}
enabled_hints.SetIsEnabled(
mojom::WebClientHintsType::kDeviceMemory,
enabled_hints.IsEnabled(mojom::WebClientHintsType::kDeviceMemory) &&
RuntimeEnabledFeatures::DeviceMemoryHeaderEnabled());
enabled_hints.SetIsEnabled(
mojom::WebClientHintsType::kRtt,
enabled_hints.IsEnabled(mojom::WebClientHintsType::kRtt) &&
RuntimeEnabledFeatures::NetInfoRttHeaderEnabled());
enabled_hints.SetIsEnabled(
mojom::WebClientHintsType::kDownlink,
enabled_hints.IsEnabled(mojom::WebClientHintsType::kDownlink) &&
RuntimeEnabledFeatures::NetInfoDownlinkHeaderEnabled());
enabled_hints.SetIsEnabled(
mojom::WebClientHintsType::kEct,
enabled_hints.IsEnabled(mojom::WebClientHintsType::kEct) &&
RuntimeEnabledFeatures::NetInfoEffectiveTypeHeaderEnabled());
}
} // namespace
ClientHintsPreferences::ClientHintsPreferences() {
DCHECK_EQ(static_cast<size_t>(mojom::WebClientHintsType::kMaxValue) + 1,
kClientHintsHeaderMappingCount);
}
void ClientHintsPreferences::UpdateFrom(
const ClientHintsPreferences& preferences) {
for (size_t i = 0;
i < static_cast<int>(mojom::WebClientHintsType::kMaxValue) + 1; ++i) {
mojom::WebClientHintsType type = static_cast<mojom::WebClientHintsType>(i);
enabled_hints_.SetIsEnabled(type, preferences.ShouldSend(type));
}
}
void ClientHintsPreferences::UpdateFromAcceptClientHintsHeader(
const String& header_value,
const KURL& url,
Context* context) {
if (header_value.IsEmpty())
return;
// If the persistent client hint feature is enabled, then client hints
// should be allowed only on secure URLs.
if (blink::RuntimeEnabledFeatures::ClientHintsPersistentEnabled() &&
!IsClientHintsAllowed(url)) {
return;
}
WebEnabledClientHints new_enabled_types;
ParseAcceptChHeader(header_value, new_enabled_types);
for (size_t i = 0;
i < static_cast<int>(mojom::WebClientHintsType::kMaxValue) + 1; ++i) {
mojom::WebClientHintsType type = static_cast<mojom::WebClientHintsType>(i);
enabled_hints_.SetIsEnabled(type, enabled_hints_.IsEnabled(type) ||
new_enabled_types.IsEnabled(type));
}
if (context) {
for (size_t i = 0;
i < static_cast<int>(mojom::WebClientHintsType::kMaxValue) + 1; ++i) {
mojom::WebClientHintsType type =
static_cast<mojom::WebClientHintsType>(i);
if (enabled_hints_.IsEnabled(type))
context->CountClientHints(type);
}
}
}
// static
void ClientHintsPreferences::UpdatePersistentHintsFromHeaders(
const ResourceResponse& response,
Context* context,
WebEnabledClientHints& enabled_hints,
TimeDelta* persist_duration) {
*persist_duration = base::TimeDelta();
if (response.WasCached())
return;
String accept_ch_header_value =
response.HttpHeaderField(HTTPNames::Accept_CH);
String accept_ch_lifetime_header_value =
response.HttpHeaderField(HTTPNames::Accept_CH_Lifetime);
if (!RuntimeEnabledFeatures::ClientHintsPersistentEnabled() ||
accept_ch_header_value.IsEmpty() ||
accept_ch_lifetime_header_value.IsEmpty()) {
return;
}
const KURL url = response.Url();
if (!IsClientHintsAllowed(url))
return;
bool conversion_ok = false;
int64_t persist_duration_seconds =
accept_ch_lifetime_header_value.ToInt64Strict(&conversion_ok);
if (!conversion_ok || persist_duration_seconds <= 0)
return;
*persist_duration = TimeDelta::FromSeconds(persist_duration_seconds);
if (context)
context->CountPersistentClientHintHeaders();
ParseAcceptChHeader(accept_ch_header_value, enabled_hints);
}
// static
bool ClientHintsPreferences::IsClientHintsAllowed(const KURL& url) {
return (url.ProtocolIs("http") || url.ProtocolIs("https")) &&
(SecurityOrigin::IsSecure(url) ||
SecurityOrigin::Create(url)->IsLocalhost());
}
} // namespace blink
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