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// Copyright 2023 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/browsing_topics/browsing_topics_url_loader_interceptor.h"
#include "base/metrics/histogram_functions.h"
#include "components/browsing_topics/common/common_types.h"
#include "content/browser/browsing_topics/header_util.h"
#include "content/browser/renderer_host/render_frame_host_impl.h"
#include "content/public/browser/content_browser_client.h"
#include "content/public/browser/page.h"
#include "content/public/common/content_client.h"
#include "services/network/public/cpp/is_potentially_trustworthy.h"
#include "third_party/blink/public/common/features.h"
#include "third_party/blink/public/mojom/browsing_topics/browsing_topics.mojom.h"
namespace content {
namespace {
// The topics header outcome for the fetch initial request or redirect.
//
// These values are persisted to logs. Entries should not be renumbered and
// numeric values should never be reused.
enum class BrowsingTopicsFetchRequestOrRedirectResult {
kSuccess = 0,
kDisallowedByContentClient = 1,
kNoInitiatorFrame = 2,
kFromFencedFrame = 3,
kFromNonPrimaryPage = 4,
kOpaqueCallerOrigin = 5,
kNonSecureCallerOrigin = 6,
kDisallowedByPermissionsPolicy = 7,
kMaxValue = kDisallowedByPermissionsPolicy,
};
void RecordFetchRequestResultUma(
BrowsingTopicsFetchRequestOrRedirectResult result,
bool is_redirect) {
if (is_redirect) {
base::UmaHistogramEnumeration(
"BrowsingTopics.Fetch.RedirectedUrlRequest.Result", result);
} else {
base::UmaHistogramEnumeration(
"BrowsingTopics.Fetch.InitialUrlRequest.Result", result);
}
}
} // namespace
BrowsingTopicsURLLoaderInterceptor::BrowsingTopicsURLLoaderInterceptor(
WeakDocumentPtr document,
const network::ResourceRequest& resource_request)
: document_(document),
resource_request_(resource_request),
url_(resource_request.url) {
CHECK(resource_request_->browsing_topics);
}
BrowsingTopicsURLLoaderInterceptor::~BrowsingTopicsURLLoaderInterceptor() =
default;
void BrowsingTopicsURLLoaderInterceptor::WillStartRequest(
net::HttpRequestHeaders& headers) {
PopulateRequestOrRedirectHeaders(/*is_redirect=*/false, headers,
/*removed_headers=*/nullptr);
}
void BrowsingTopicsURLLoaderInterceptor::WillFollowRedirect(
const std::optional<GURL>& new_url,
std::vector<std::string>& removed_headers,
net::HttpRequestHeaders& modified_headers) {
if (new_url) {
url_ = new_url.value();
}
PopulateRequestOrRedirectHeaders(/*is_redirect=*/true, modified_headers,
&removed_headers);
}
void BrowsingTopicsURLLoaderInterceptor::OnReceiveRedirect(
const net::RedirectInfo& redirect_info,
network::mojom::URLResponseHeadPtr& head) {
ProcessRedirectOrResponseHeaders(head);
url_ = redirect_info.new_url;
}
void BrowsingTopicsURLLoaderInterceptor::OnReceiveResponse(
network::mojom::URLResponseHeadPtr& head) {
ProcessRedirectOrResponseHeaders(head);
}
void BrowsingTopicsURLLoaderInterceptor::PopulateRequestOrRedirectHeaders(
bool is_redirect,
net::HttpRequestHeaders& headers,
std::vector<std::string>* removed_headers) {
DCHECK(resource_request_->browsing_topics);
topics_eligible_ = false;
if (removed_headers) {
removed_headers->push_back(kBrowsingTopicsRequestHeaderKey);
}
// Due to the race between the subresource requests and navigations, this
// request may arrive before the commit confirmation is received (i.e.
// NavigationRequest::DidCommitNavigation()), or after the document is
// destroyed. We consider those cases to be ineligible for topics.
RenderFrameHost* request_initiator_frame =
document_.AsRenderFrameHostIfValid();
if (!request_initiator_frame) {
RecordFetchRequestResultUma(
BrowsingTopicsFetchRequestOrRedirectResult::kNoInitiatorFrame,
is_redirect);
return;
}
// Fenced frames disallow most permissions policies which would let this
// function return false regardless, but adding this check to be more
// explicit.
if (request_initiator_frame->IsNestedWithinFencedFrame()) {
RecordFetchRequestResultUma(
BrowsingTopicsFetchRequestOrRedirectResult::kFromFencedFrame,
is_redirect);
return;
}
if (!request_initiator_frame->GetPage().IsPrimary()) {
RecordFetchRequestResultUma(
BrowsingTopicsFetchRequestOrRedirectResult::kFromNonPrimaryPage,
is_redirect);
return;
}
url::Origin origin = url::Origin::Create(url_);
if (origin.opaque()) {
RecordFetchRequestResultUma(
BrowsingTopicsFetchRequestOrRedirectResult::kOpaqueCallerOrigin,
is_redirect);
return;
}
// TODO(yaoxia): should this be `ReportBadMessage`? On the renderer side, the
// fetch initiator context must be secure. Does it imply that the requested
// `origin` is always potentially trustworthy?
if (!network::IsOriginPotentiallyTrustworthy(origin)) {
RecordFetchRequestResultUma(
BrowsingTopicsFetchRequestOrRedirectResult::kNonSecureCallerOrigin,
is_redirect);
return;
}
const network::PermissionsPolicy* permissions_policy =
request_initiator_frame->GetPermissionsPolicy();
if (!permissions_policy->IsFeatureEnabledForOrigin(
network::mojom::PermissionsPolicyFeature::kBrowsingTopics, origin,
/*override_default_policy_to_all=*/true) ||
!permissions_policy->IsFeatureEnabledForOrigin(
network::mojom::PermissionsPolicyFeature::
kBrowsingTopicsBackwardCompatible,
origin, /*override_default_policy_to_all=*/true)) {
RecordFetchRequestResultUma(BrowsingTopicsFetchRequestOrRedirectResult::
kDisallowedByPermissionsPolicy,
is_redirect);
return;
}
std::vector<blink::mojom::EpochTopicPtr> topics;
topics_eligible_ = GetContentClient()->browser()->HandleTopicsWebApi(
origin, request_initiator_frame->GetMainFrame(),
resource_request_->is_fetch_like_api
? browsing_topics::ApiCallerSource::kFetch
: browsing_topics::ApiCallerSource::kImgAttribute,
/*get_topics=*/true,
/*observe=*/false, topics);
const int num_versions_in_epochs =
topics_eligible_
? GetContentClient()->browser()->NumVersionsInTopicsEpochs(
request_initiator_frame->GetMainFrame())
: 0;
headers.SetHeader(kBrowsingTopicsRequestHeaderKey,
DeriveTopicsHeaderValue(topics, num_versions_in_epochs));
if (topics_eligible_) {
RecordFetchRequestResultUma(
BrowsingTopicsFetchRequestOrRedirectResult::kSuccess, is_redirect);
} else {
RecordFetchRequestResultUma(
BrowsingTopicsFetchRequestOrRedirectResult::kDisallowedByContentClient,
is_redirect);
}
}
void BrowsingTopicsURLLoaderInterceptor::ProcessRedirectOrResponseHeaders(
const network::mojom::URLResponseHeadPtr& head) {
if (topics_eligible_) {
RenderFrameHost* rfh = document_.AsRenderFrameHostIfValid();
if (!rfh) {
return;
}
HandleTopicsEligibleResponse(
head->parsed_headers, url::Origin::Create(url_), *rfh,
resource_request_->is_fetch_like_api
? browsing_topics::ApiCallerSource::kFetch
: browsing_topics::ApiCallerSource::kImgAttribute);
topics_eligible_ = false;
}
}
} // namespace content
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