components/plus_addresses/plus_address_jit_allocator.h

// Copyright 2024 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_PLUS_ADDRESSES_PLUS_ADDRESS_JIT_ALLOCATOR_H_
#define COMPONENTS_PLUS_ADDRESSES_PLUS_ADDRESS_JIT_ALLOCATOR_H_

#include <optional>

#include "base/containers/flat_map.h"
#include "base/memory/raw_ref.h"
#include "base/memory/weak_ptr.h"
#include "base/time/time.h"
#include "components/plus_addresses/plus_address_allocator.h"
#include "components/plus_addresses/plus_address_types.h"
#include "url/origin.h"

namespace plus_addresses {

class PlusAddressHttpClient;
class PlusAddressService;

class PlusAddressJitAllocator : public PlusAddressAllocator {
 public:
  explicit PlusAddressJitAllocator(PlusAddressHttpClient* http_client);
  ~PlusAddressJitAllocator() override;

  // PlusAddressAllocator:
  void AllocatePlusAddress(const url::Origin& origin,
                           AllocationMode mode,
                           PlusAddressRequestCallback callback) override;
  std::optional<PlusProfile> AllocatePlusAddressSynchronously(
      const url::Origin& origin,
      AllocationMode mode) override;
  bool IsRefreshingSupported(const url::Origin& origin) const override;
  void RemoveAllocatedPlusAddress(const PlusAddress& plus_address) override;

 private:
  // Checks the `profile_or_error` response before passing it on to `callback`.
  // If it receives a 429 code, it disables refreshing until a cooldown period
  // has expired.
  void HandleRefreshResponse(PlusAddressRequestCallback callback,
                             const PlusProfileOrError& profile_or_error);

  // Responsible for server communication. Owned by the `PlusAddressService` and
  // outlives `this`.
  const raw_ref<PlusAddressHttpClient> http_client_;

  // Counts how many refresh attempts where made for an `Origin`. Serves to
  // limit the number of refresh requests per session.
  base::flat_map<url::Origin, int> refresh_attempts_;

  // The last known time that the user reached the refresh limit.
  base::TimeTicks time_refresh_limit_reached_;

  base::WeakPtrFactory<PlusAddressJitAllocator> weak_ptr_factory_{this};
};

}  // namespace plus_addresses

#endif  // COMPONENTS_PLUS_ADDRESSES_PLUS_ADDRESS_JIT_ALLOCATOR_H_