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// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/browser/origin_trials/critical_origin_trials_throttle.h"
#include "base/metrics/histogram_macros.h"
#include "base/time/time.h"
#include "content/browser/origin_trials/origin_trials_utils.h"
#include "content/public/browser/origin_trials_controller_delegate.h"
#include "services/network/public/cpp/resource_request.h"
#include "third_party/blink/public/common/origin_trials/origin_trials.h"
#include "third_party/blink/public/common/origin_trials/trial_token.h"
#include "third_party/blink/public/common/origin_trials/trial_token_result.h"
#include "third_party/blink/public/common/origin_trials/trial_token_validator.h"
#include "third_party/blink/public/mojom/loader/resource_load_info.mojom.h"
#include "url/origin.h"
namespace content {
using blink::mojom::ResourceType;
// static
bool CriticalOriginTrialsThrottle::IsNavigationRequest(
const network::ResourceRequest& request) {
ResourceType request_resource_type =
static_cast<ResourceType>(request.resource_type);
return request_resource_type == ResourceType::kMainFrame ||
request_resource_type == ResourceType::kSubFrame;
}
CriticalOriginTrialsThrottle::CriticalOriginTrialsThrottle(
OriginTrialsControllerDelegate& origin_trials_delegate,
std::optional<url::Origin> top_frame_origin,
std::optional<ukm::SourceId> source_id)
: origin_trials_delegate_(origin_trials_delegate),
top_frame_origin_(std::move(top_frame_origin)),
source_id_(source_id) {}
CriticalOriginTrialsThrottle::~CriticalOriginTrialsThrottle() = default;
void CriticalOriginTrialsThrottle::WillStartRequest(
network::ResourceRequest* request,
bool* defer) {
// Right now, Persistent Origin Trials are only supported on navigation
// requests. Until support is implemented for other request types, we need to
// only intercept navigation requests.
is_navigation_request_ = IsNavigationRequest(*request);
if (is_navigation_request_)
SetPreRequestFields(request->url);
}
void CriticalOriginTrialsThrottle::BeforeWillProcessResponse(
const GURL& response_url,
const network::mojom::URLResponseHead& response_head,
RestartWithURLReset* restart_with_url_reset) {
if (is_navigation_request_) {
DCHECK_EQ(response_url, request_url_);
MaybeRestartWithTrials(response_head, restart_with_url_reset);
}
}
void CriticalOriginTrialsThrottle::BeforeWillRedirectRequest(
net::RedirectInfo* redirect_info,
const network::mojom::URLResponseHead& response_head,
RestartWithURLReset* restart_with_url_reset,
std::vector<std::string>* to_be_removed_request_headers,
net::HttpRequestHeaders* modified_request_headers,
net::HttpRequestHeaders* modified_cors_exempt_request_headers) {
if (is_navigation_request_) {
MaybeRestartWithTrials(response_head, restart_with_url_reset);
// Update the stored information for the new request
SetPreRequestFields(redirect_info->new_url);
}
}
void CriticalOriginTrialsThrottle::MaybeRestartWithTrials(
const network::mojom::URLResponseHead& response_head,
RestartWithURLReset* restart_with_url_reset) {
if (!response_head.headers)
return;
std::vector<std::string> critical_trials =
GetCriticalOriginTrialHeaderValues(response_head.headers.get());
if (critical_trials.empty())
return;
url::Origin request_origin = url::Origin::Create(request_url_);
if (restarted_origins_.contains(request_origin))
return;
// Validate the trials requested and check if they can be persisted.
blink::TrialTokenValidator validator;
std::vector<std::string> origin_trial_tokens =
GetOriginTrialHeaderValues(response_head.headers.get());
base::flat_set<std::string> valid_requested_trials;
for (const std::string& token : origin_trial_tokens) {
blink::TrialTokenResult result = validator.ValidateTokenAndTrial(
token, request_origin, base::Time::Now());
if (result.Status() == blink::OriginTrialTokenStatus::kSuccess &&
blink::origin_trials::IsTrialPersistentToNextResponse(
result.ParsedToken()->feature_name())) {
valid_requested_trials.insert(result.ParsedToken()->feature_name());
}
}
// Check if a critical trial was requested but not present on the original
// request.
bool needs_restart = false;
for (const std::string& trial : critical_trials) {
if (valid_requested_trials.contains(trial) &&
!original_persisted_trials_.contains(trial)) {
needs_restart = true;
}
}
// The header was present, emit a histogram to track if we need a restart.
UMA_HISTOGRAM_BOOLEAN("OriginTrials.PersistentOriginTrial.CriticalRestart",
needs_restart);
if (needs_restart) {
// Persist the trials that were set, so we can try again.
url::Origin partition_origin = top_frame_origin_.value_or(request_origin);
// Add the new tokens to the set of persisted trials
origin_trials_delegate_->PersistAdditionalTrialsFromTokens(
request_origin, partition_origin, /*script_origins=*/{},
origin_trial_tokens, base::Time::Now(), source_id_);
restarted_origins_.insert(request_origin);
*restart_with_url_reset = RestartWithURLReset(true);
}
}
void CriticalOriginTrialsThrottle::SetPreRequestFields(
const GURL& request_url) {
request_url_ = request_url;
url::Origin partition_origin =
top_frame_origin_.value_or(url::Origin::Create(request_url_));
original_persisted_trials_ =
origin_trials_delegate_->GetPersistedTrialsForOrigin(
url::Origin::Create(request_url_), partition_origin,
base::Time::Now());
}
} // namespace content
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