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// Copyright 2011 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_VISITEDLINK_RENDERER_VISITEDLINK_READER_H_
#define COMPONENTS_VISITEDLINK_RENDERER_VISITEDLINK_READER_H_
#include "base/compiler_specific.h"
#include "base/memory/read_only_shared_memory_region.h"
#include "base/memory/shared_memory_mapping.h"
#include "base/memory/weak_ptr.h"
#include "components/visitedlink/common/visitedlink.mojom.h"
#include "components/visitedlink/common/visitedlink_common.h"
#include "mojo/public/cpp/bindings/pending_receiver.h"
#include "mojo/public/cpp/bindings/receiver.h"
namespace visitedlink {
// Reads the link coloring database provided by the writer. There can be any
// number of readers reading the same database.
class VisitedLinkReader : public VisitedLinkCommon,
public mojom::VisitedLinkNotificationSink {
public:
VisitedLinkReader();
VisitedLinkReader(const VisitedLinkReader&) = delete;
VisitedLinkReader& operator=(const VisitedLinkReader&) = delete;
~VisitedLinkReader() override;
base::RepeatingCallback<
void(mojo::PendingReceiver<mojom::VisitedLinkNotificationSink>)>
GetBindCallback();
// Mutator for `salts_`. Called by Documents which received
// per-origin salts from their navigation commit params. This function may
// only be called on the UI (main) thread.
void AddOrUpdateSalt(const url::Origin& origin, uint64_t salt) {
salts_[origin] = salt;
}
// Determines the per-origin salt required to hash this triple-partition key
// and returns the resulting fingerprint. If a valid fingerprint cannot be
// computed, returns 0 ("the null fingerprint").
uint64_t ComputePartitionedFingerprint(
std::string_view canonical_link_url,
const net::SchemefulSite& top_level_site,
const url::Origin& frame_origin);
// mojom::VisitedLinkNotificationSink overrides.
void UpdateVisitedLinks(
base::ReadOnlySharedMemoryRegion table_region) override;
void AddVisitedLinks(
const std::vector<VisitedLinkReader::Fingerprint>& fingerprints) override;
void ResetVisitedLinks(bool invalidate_hashes) override;
void UpdateOriginSalts(
const base::flat_map<url::Origin, uint64_t>& origin_salts) override;
private:
void FreeTable();
// These helper functions for UpdateVisitedLinks() allow us to use the correct
// header (SharedHeader or PartitionedSharedHeader) when reading the new
// shared memory region into our copy of the hashtable.
void UpdateUnpartitionedVisitedLinks(
base::ReadOnlySharedMemoryRegion table_region);
void UpdatePartitionedVisitedLinks(
base::ReadOnlySharedMemoryRegion table_region);
void Bind(mojo::PendingReceiver<mojom::VisitedLinkNotificationSink> receiver);
// Contains the per-origin salts required to hash every :visited link relevant
// to this RenderProcess. Queries to the hashtable stored within
// `table_mapping_` MUST provide the salt that corresponds to that link's
// origin, otherwise :visited status cannot be determined.
std::map<url::Origin, uint64_t> salts_;
base::ReadOnlySharedMemoryMapping table_mapping_;
mojo::Receiver<mojom::VisitedLinkNotificationSink> receiver_{this};
base::WeakPtrFactory<VisitedLinkReader> weak_factory_{this};
};
} // namespace visitedlink
#endif // COMPONENTS_VISITEDLINK_RENDERER_VISITEDLINK_READER_H_
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