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// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef UI_DISPLAY_MANAGER_CONTENT_PROTECTION_KEY_MANAGER_H_
#define UI_DISPLAY_MANAGER_CONTENT_PROTECTION_KEY_MANAGER_H_
#include "base/containers/flat_map.h"
#include "base/containers/flat_set.h"
#include "base/memory/raw_ptr.h"
#include "ui/display/manager/display_manager_export.h"
#include "ui/display/types/display_snapshot.h"
#include "ui/display/types/native_display_delegate.h"
namespace display {
// ContentProtectionKeyManager is responsible for managing the provisioned HDCP
// key for the displays.
// Some drivers such as msm expose "Content Protection Key" connector prop that
// needs a key to enable HDCP. The key is typically provisioned from a server.
// The Workflow when a key is required:
// 1. Check for a valid key request function.
// 2. Look for the "Content Protection Key" connector property to verify if the
// key is required.
// 3. Check for keys that are cached for the HDCP capable displays, if they
// don't exist get the provisioned key from the server.
// 4. Inject the key into the kernel by writing the key into the
// "Content Protection Key" connector property of each HDCP capable display.
class DISPLAY_MANAGER_EXPORT ContentProtectionKeyManager {
public:
using ProvisionedKeyRequest = base::RepeatingCallback<void(
base::OnceCallback<void(const std::string&)>)>;
using KeySetCallback = base::OnceCallback<void(bool)>;
ContentProtectionKeyManager();
ContentProtectionKeyManager(const ContentProtectionKeyManager&) = delete;
ContentProtectionKeyManager& operator=(const ContentProtectionKeyManager&) =
delete;
~ContentProtectionKeyManager();
void set_provisioned_key_request(ProvisionedKeyRequest request) {
provisioned_key_request_ = std::move(request);
}
void set_native_display_delegate(NativeDisplayDelegate* delegate) {
native_display_delegate_ = delegate;
}
// Check for the key prop of |displays_states|, request the key by calling
// |provisioned_key_request_| and inject the key into the kernel if
// required. When the displays config is done, call |on_key_set|.
void SetKeyIfRequired(
const std::vector<raw_ptr<DisplaySnapshot, VectorExperimental>>&
displays_states,
int64_t display_id,
KeySetCallback on_key_set);
private:
void FetchKeyFromServer();
void OnKeyFetchedFromServer(const std::string& key);
void InjectKeyToKernel(int64_t display_id);
void OnKeyInjectedToKernel(int64_t display_id, bool success);
void TriggerPendingCallbacks(int64_t callback_id, bool is_key_set);
// Function to request the provisioned key from the server.
ProvisionedKeyRequest provisioned_key_request_;
// It is assumed that the key is the same for all the displays and doesn't
// change throughout the life of the process.
std::string cached_provisioned_key_;
raw_ptr<NativeDisplayDelegate> native_display_delegate_ =
nullptr; // Not owned.
base::flat_map<int64_t, KeySetCallback> pending_display_callbacks_;
base::flat_set<int64_t> displays_pending_set_key_;
base::WeakPtrFactory<ContentProtectionKeyManager> weak_ptr_factory_{this};
};
} // namespace display
#endif // UI_DISPLAY_MANAGER_CONTENT_PROTECTION_KEY_MANAGER_H_
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