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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.
#ifndef CONTENT_BROWSER_INTEREST_GROUP_AD_AUCTION_URL_LOADER_INTERCEPTOR_H_
#define CONTENT_BROWSER_INTEREST_GROUP_AD_AUCTION_URL_LOADER_INTERCEPTOR_H_
#include <string>
#include <vector>
#include "base/memory/raw_ref.h"
#include "content/browser/loader/subresource_proxying_url_loader.h"
#include "content/public/browser/weak_document_ptr.h"
#include "net/http/http_request_headers.h"
#include "net/url_request/redirect_info.h"
#include "services/network/public/cpp/resource_request.h"
#include "services/network/public/mojom/url_response_head.mojom-forward.h"
#include "url/gurl.h"
#include "url/origin.h"
namespace content {
// A loader interceptor for handling an ad auction subresource request,
// including fetch(<url>, {adAuctionHeaders: true}).
//
// This loader interceptor works as follows:
// 1. Before making a network request (i.e. WillStartRequest()), if the
// request is eligible for ad auction headers, add the
// `Sec-Ad-Auction-Fetch: ?1` header.
// 2. If any redirect is encountered, skip handling the response; otherwise,
// for the response (i.e. OnReceiveResponse()), if the previous request was
// eligible for ad auction headers, and if the response header contains the
// auction result, signals, or additional bids, associate them with the
// top-level page.
class CONTENT_EXPORT AdAuctionURLLoaderInterceptor
: public SubresourceProxyingURLLoader::Interceptor {
public:
AdAuctionURLLoaderInterceptor(
WeakDocumentPtr document,
const network::ResourceRequest& resource_request);
AdAuctionURLLoaderInterceptor(const AdAuctionURLLoaderInterceptor&) = delete;
AdAuctionURLLoaderInterceptor& operator=(
const AdAuctionURLLoaderInterceptor&) = delete;
~AdAuctionURLLoaderInterceptor() override;
// SubresourceProxyingURLLoader::Interceptor
void WillStartRequest(net::HttpRequestHeaders& headers) override;
void WillFollowRedirect(const std::optional<GURL>& new_url,
std::vector<std::string>& removed_headers,
net::HttpRequestHeaders& modified_headers) override;
void OnReceiveRedirect(const net::RedirectInfo& redirect_info,
network::mojom::URLResponseHeadPtr& head) override;
void OnReceiveResponse(network::mojom::URLResponseHeadPtr& head) override;
private:
// Upon NavigationRequest::DidCommitNavigation(), `document_` will be set to
// the document that this request is associated with. It will become null
// whenever the document navigates away.
WeakDocumentPtr document_;
// The initial request state. This will be used to derive the opt-in
// permissions policy features.
const raw_ref<const network::ResourceRequest> resource_request_;
// The request URL's origin.
url::Origin request_origin_;
// Whether the ongoing request or redirect is eligible for ad auction headers.
// Set to the desired state when a request/redirect is made. Reset to false
// when the corresponding response is received.
bool ad_auction_headers_eligible_ = false;
};
} // namespace content
#endif // CONTENT_BROWSER_INTEREST_GROUP_AD_AUCTION_URL_LOADER_INTERCEPTOR_H_
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