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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_AFFILIATIONS_CORE_BROWSER_HASH_AFFILIATION_FETCHER_H_
#define COMPONENTS_AFFILIATIONS_CORE_BROWSER_HASH_AFFILIATION_FETCHER_H_
#include <string>
#include <vector>
#include "base/functional/callback.h"
#include "base/memory/raw_ptr.h"
#include "base/memory/ref_counted.h"
#include "base/timer/elapsed_timer.h"
#include "components/affiliations/core/browser/affiliation_fetcher_interface.h"
namespace net {
struct NetworkTrafficAnnotationTag;
}
namespace network {
class SharedURLLoaderFactory;
class SimpleURLLoader;
} // namespace network
namespace affiliations {
// Fetches authoritative information about facets' affiliations with additional
// privacy layer. It uses SHA-256 to hash facet URLs and sends only a specified
// amount of hash prefixes to eventually retrieve a larger group of affiliations
// including those actually required.
class HashAffiliationFetcher : public AffiliationFetcherInterface {
public:
explicit HashAffiliationFetcher(
scoped_refptr<network::SharedURLLoaderFactory> url_loader_factory);
~HashAffiliationFetcher() override;
// AffiliationFetcherInterface
void StartRequest(
const std::vector<FacetURI>& facet_uris,
RequestInfo request_info,
base::OnceCallback<void(FetchResult)> result_callback) override;
const std::vector<FacetURI>& GetRequestedFacetURIs() const override;
// Builds the URL for the Affiliation API's lookup method.
static GURL BuildQueryURL();
static bool IsFetchPossible();
private:
// Actually starts the request to retrieve affiliations and optionally
// groupings for each facet in |facet_uris| along with the details based on
// |request_info|. Calls the delegate with the results on the same thread when
// done. If |this| is destroyed before completion, the in-flight request is
// cancelled, and the delegate will not be called. Further details:
// * No cookies are sent/saved with the request.
// * In case of network/server errors, the request will not be retried.
// * Results are guaranteed to be always fresh and will never be cached.
void FinalizeRequest(const std::string& payload,
const GURL& query_url,
net::NetworkTrafficAnnotationTag traffic_annotation);
// Parses and validates the response protocol buffer message for a list of
// equivalence classes, stores them into |result| and returns true on success.
// It is guaranteed that every one of the requested Facet URIs will be a
// member of exactly one returned equivalence class.
// Returns false if the response was gravely ill-formed or self-inconsistent.
// Unknown kinds of facet URIs and new protocol buffer fields will be ignored.
bool ParseResponse(
const std::string& serialized_response,
AffiliationFetcherInterface::ParsedFetchResponse* result) const;
void OnSimpleLoaderComplete(std::unique_ptr<std::string> response_body);
std::vector<FacetURI> requested_facet_uris_;
base::OnceCallback<void(FetchResult)> result_callback_;
scoped_refptr<network::SharedURLLoaderFactory> url_loader_factory_;
base::ElapsedTimer fetch_timer_;
std::unique_ptr<network::SimpleURLLoader> simple_url_loader_;
};
bool operator==(const AffiliationFetcherInterface::RequestInfo& lhs,
const AffiliationFetcherInterface::RequestInfo& rhs);
} // namespace affiliations
#endif // COMPONENTS_AFFILIATIONS_CORE_BROWSER_HASH_AFFILIATION_FETCHER_H_
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