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// Copyright 2019 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <cstdint>
#include <memory>
#include "base/callback.h"
#include "base/containers/flat_map.h"
#include "base/containers/queue.h"
#include "base/macros.h"
#include "base/memory/weak_ptr.h"
#include "base/observer_list.h"
#include "base/optional.h"
#include "base/timer/timer.h"
#include "ui/display/manager/display_configurator.h"
#include "ui/display/manager/display_manager_export.h"
namespace display {
class DisplayLayoutManager;
class DisplaySnapshot;
class NativeDisplayDelegate;
namespace test {
class ContentProtectionManagerTest;
} // namespace test
// Fulfills client requests to query and apply per-display or all display
// content protection, and notifies observers of display security changes.
// Changes are detected by polling as required by the kernel API, since
// authentication latency depends on hardware topology, and the hardware may
// temporarily drop authentication, in which case the kernel automatically tries
// to re-establish protection.
class DISPLAY_MANAGER_EXPORT ContentProtectionManager
: public DisplayConfigurator::Observer {
// |connection_mask| is a DisplayConnectionType bitmask, and |protection_mask|
// is a ContentProtectionMethod bitmask.
using QueryContentProtectionCallback = base::OnceCallback<
void(bool success, uint32_t connection_mask, uint32_t protection_mask)>;
using ApplyContentProtectionCallback = base::OnceCallback<void(bool success)>;
using ContentProtections =
base::flat_map<int64_t /* display_id */, uint32_t /* protection_mask */>;
// Though only run once, a task must outlive its asynchronous operations, so
// cannot be a OnceCallback.
struct Task {
enum class Status { KILLED, FAILURE, SUCCESS };
virtual ~Task() = default;
virtual void Run() = 0;
class Observer : public base::CheckedObserver {
~Observer() override = default;
// Called after the secure state of a display has been changed.
virtual void OnDisplaySecurityChanged(int64_t display_id, bool secure) = 0;
// Returns whether display configuration is disabled, in which case API calls
// are no-ops resulting in failure callbacks.
using ConfigurationDisabledCallback = base::RepeatingCallback<bool()>;
~ContentProtectionManager() override;
void set_native_display_delegate(NativeDisplayDelegate* delegate) {
native_display_delegate_ = delegate;
using ClientId = base::Optional<uint64_t>;
// On display reconfiguration, pending requests are cancelled, i.e. clients
// receive failure callbacks, and are responsible for renewing requests. If a
// client unregisters with pending requests, the callbacks are not run.
ClientId RegisterClient();
void UnregisterClient(ClientId client_id);
void AddObserver(Observer* observer);
void RemoveObserver(Observer* observer);
// Queries protection against the client's latest request on the same display,
// i.e. the result is CONTENT_PROTECTION_METHOD_NONE unless the client has
// previously applied protection on that display, such that requests from
// other clients are concealed.
void QueryContentProtection(ClientId client_id,
int64_t display_id,
QueryContentProtectionCallback callback);
// |protection_mask| is a ContentProtectionMethod bitmask. Callback success
// does not mean that protection is active, but merely that the request went
// through. The client must periodically query protection status until it no
// longer requires protection and applies CONTENT_PROTECTION_METHOD_NONE. If
// protection becomes temporarily unavailable, the client is not required to
// renew the request, but should keep querying to detect if automatic retries
// to establish protection are successful.
void ApplyContentProtection(ClientId client_id,
int64_t display_id,
uint32_t protection_mask,
ApplyContentProtectionCallback callback);
friend class test::ContentProtectionManagerTest;
bool disabled() const {
return !native_display_delegate_ || config_disabled_callback_.Run();
const DisplaySnapshot* GetDisplay(int64_t display_id) const;
// Returns cumulative content protections given all client requests.
ContentProtections AggregateContentProtections() const;
// Returns content protections for |client_id|, or nullptr if invalid.
ContentProtections* GetContentProtections(ClientId client_id);
void QueueTask(std::unique_ptr<Task> task);
void DequeueTask();
void KillTasks();
// Called on task completion. Responsible for running the client callback, and
// dequeuing the next pending task.
void OnContentProtectionQueried(QueryContentProtectionCallback callback,
ClientId client_id,
int64_t display_id,
Task::Status status,
uint32_t connection_mask,
uint32_t protection_mask);
void OnContentProtectionApplied(ApplyContentProtectionCallback callback,
ClientId client_id,
Task::Status status);
// DisplayConfigurator::Observer overrides:
void OnDisplayModeChanged(
const DisplayConfigurator::DisplayStateList&) override;
void OnDisplayModeChangeFailed(const DisplayConfigurator::DisplayStateList&,
MultipleDisplayState) override;
bool ShouldPollDisplaySecurity() const;
// Toggles timer for periodic security queries given latest client requests.
void ToggleDisplaySecurityPolling();
// Forces timer to fire if running, and returns whether it was running.
bool TriggerDisplaySecurityTimeoutForTesting();
// Queries protection status for all displays, and notifies observers whether
// each display is secure. Called periodically while protection is requested.
void QueueDisplaySecurityQueries();
void OnDisplaySecurityQueried(int64_t display_id,
Task::Status status,
uint32_t connection_mask,
uint32_t protection_mask);
DisplayLayoutManager* const layout_manager_; // Not owned.
NativeDisplayDelegate* native_display_delegate_ = nullptr; // Not owned.
const ConfigurationDisabledCallback config_disabled_callback_;
uint64_t next_client_id_ = 0;
// Content protections requested by each client.
base::flat_map<uint64_t, ContentProtections> requests_;
// Pending tasks to query or apply content protection.
base::queue<std::unique_ptr<Task>> tasks_;
base::ObserverList<Observer> observers_;
// Used for periodic queries to notify observers of display security changes.
base::RepeatingTimer security_timer_;
base::WeakPtrFactory<ContentProtectionManager> weak_ptr_factory_{this};
} // namespace display