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content / browser / interest_group / bidding_and_auction_server_key_fetcher.h [blame]
// 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_BIDDING_AND_AUCTION_SERVER_KEY_FETCHER_H_
#define CONTENT_BROWSER_INTEREST_GROUP_BIDDING_AND_AUCTION_SERVER_KEY_FETCHER_H_
#include <optional>
#include <string>
#include <vector>
#include "base/containers/circular_deque.h"
#include "base/functional/callback.h"
#include "base/memory/raw_ptr.h"
#include "base/types/expected.h"
#include "content/common/content_export.h"
#include "services/data_decoder/public/cpp/data_decoder.h"
#include "services/network/public/cpp/shared_url_loader_factory.h"
#include "url/gurl.h"
#include "url/origin.h"
namespace network {
class SimpleURLLoader;
} // namespace network
namespace content {
class InterestGroupManagerImpl;
inline constexpr char kDefaultBiddingAndAuctionGCPCoordinatorOrigin[] =
"https://publickeyservice.gcp.privacysandboxservices.com";
inline constexpr char kBiddingAndAuctionGCPCoordinatorOrigin[] =
"https://publickeyservice.pa.gcp.privacysandboxservices.com";
inline constexpr char kBiddingAndAuctionGCPCoordinatorKeyURL[] =
"https://publickeyservice.pa.gcp.privacysandboxservices.com/.well-known/"
"protected-auction/v1/public-keys";
inline constexpr char kBiddingAndAuctionAWSCoordinatorOrigin[] =
"https://publickeyservice.pa.aws.privacysandboxservices.com";
inline constexpr char kBiddingAndAuctionAWSCoordinatorKeyURL[] =
"https://publickeyservice.pa.aws.privacysandboxservices.com/.well-known/"
"protected-auction/v1/public-keys";
struct BiddingAndAuctionServerKey {
std::string key; // bytes containing the key.
uint8_t id; // key id corresponding to this key.
};
// BiddingAndAuctionServerKeyFetcher manages fetching and caching of the public
// keys for Bidding and Auction Server endpoints from each of the designated
// Coordinators with the provided `loader_factory`. Values are cached both in
// memory and in the database.
class CONTENT_EXPORT BiddingAndAuctionServerKeyFetcher {
public:
using BiddingAndAuctionServerKeyFetcherCallback = base::OnceCallback<void(
base::expected<BiddingAndAuctionServerKey, std::string>)>;
// `manager` should be the InterestGroupManagerImpl that owns this
// BiddingAndAuctionServerKeyFetcher.
BiddingAndAuctionServerKeyFetcher(
InterestGroupManagerImpl* manager,
scoped_refptr<network::SharedURLLoaderFactory> loader_factory);
~BiddingAndAuctionServerKeyFetcher();
// no copy
BiddingAndAuctionServerKeyFetcher(const BiddingAndAuctionServerKeyFetcher&) =
delete;
BiddingAndAuctionServerKeyFetcher& operator=(
const BiddingAndAuctionServerKeyFetcher&) = delete;
// Fetch keys for all coordinators in kFledgeBiddingAndAuctionKeyConfig if
// kFledgePrefetchBandAKeys and kFledgeBiddingAndAuctionServer are enabled and
// if the keys haven't been fetched yet.
void MaybePrefetchKeys();
// GetOrFetchKey provides a key in the callback if necessary. If the key is
// immediately available then the callback may be called synchronously.
void GetOrFetchKey(const std::optional<url::Origin>& maybe_coordinator,
BiddingAndAuctionServerKeyFetcherCallback callback);
private:
struct PerCoordinatorFetcherState {
PerCoordinatorFetcherState();
~PerCoordinatorFetcherState();
PerCoordinatorFetcherState(PerCoordinatorFetcherState&& state);
PerCoordinatorFetcherState& operator=(PerCoordinatorFetcherState&& state);
GURL key_url;
// queue_ contains callbacks waiting for a key to be fetched over the
// network.
base::circular_deque<BiddingAndAuctionServerKeyFetcherCallback> queue;
// keys_ contains a list of keys received from the server (if any).
std::vector<BiddingAndAuctionServerKey> keys;
// expiration_ contains the expiration time for any keys that are cached by
// this object.
base::Time expiration = base::Time::Min();
// The time the key fetch starts.
base::TimeTicks fetch_start;
// The time the key fetch from the network starts. This time may be after
// unsuccessfully trying to load the key from the database.
base::TimeTicks network_fetch_start;
// loader_ contains the SimpleURLLoader being used to fetch the keys.
std::unique_ptr<network::SimpleURLLoader> loader;
};
// Fetch keys for a particular coordinator, first checking if the key is
// in the database.
void FetchKeys(const url::Origin& coordinator,
PerCoordinatorFetcherState& state,
BiddingAndAuctionServerKeyFetcherCallback callback);
void OnFetchKeysFromDatabaseComplete(
const url::Origin& coordinator,
std::pair<base::Time, std::vector<BiddingAndAuctionServerKey>> keys);
void FetchKeysFromNetwork(const url::Origin& coordinator);
// Called when the JSON blob containing the keys have been successfully
// fetched over the network.
void OnFetchKeysFromNetworkComplete(url::Origin coordinator,
std::unique_ptr<std::string> response);
// Called when the JSON blob containing the keys has be parsed into
// base::Values. Uses the parsed result to add keys to the cache and calls
// queued callbacks.
void OnParsedKeys(url::Origin coordinator,
data_decoder::DataDecoder::ValueOrError result);
void CacheKeysAndRunAllCallbacks(
const url::Origin& coordinator,
const std::vector<BiddingAndAuctionServerKey>& keys,
base::Time expiration);
void FailAllCallbacks(url::Origin coordinator);
bool did_prefetch_keys_ = false;
// May be referenced by the fetcher_state_map, so the loader_factory_ should
// be destructed last.
const scoped_refptr<network::SharedURLLoaderFactory> loader_factory_;
base::flat_map<url::Origin, PerCoordinatorFetcherState> fetcher_state_map_;
// An unowned pointer to the InterestGroupManagerImpl that owns this
// BiddingAndAuctionServerKeyFetcher. Used as an intermediary to talk to the
// database.
raw_ptr<InterestGroupManagerImpl> manager_;
const url::Origin default_gcp_coordinator_ =
url::Origin::Create(GURL(kDefaultBiddingAndAuctionGCPCoordinatorOrigin));
base::WeakPtrFactory<BiddingAndAuctionServerKeyFetcher> weak_ptr_factory_{
this};
};
} // namespace content
#endif // CONTENT_BROWSER_INTEREST_GROUP_BIDDING_AND_AUCTION_SERVER_KEY_FETCHER_H_