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/*
* Copyright (C) 2021 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package android.view.displayhash;
import static android.content.Context.DISPLAY_HASH_SERVICE;
import android.annotation.NonNull;
import android.annotation.Nullable;
import android.annotation.RequiresPermission;
import android.annotation.SystemService;
import android.annotation.TestApi;
import android.os.RemoteException;
import android.util.ArraySet;
import android.util.Log;
import android.view.WindowManagerGlobal;
import com.android.internal.annotations.GuardedBy;
import java.util.Collections;
import java.util.Set;
/**
* Manages DisplayHash requests. The manager object can be retrieved by calling
* {@code Context.getSystemService(Context.DISPLAY_HASH_SERVICE)}
*/
@SystemService(DISPLAY_HASH_SERVICE)
public final class DisplayHashManager {
private static final String TAG = "DisplayHashManager";
private final Object mSupportedHashingAlgorithmLock = new Object();
@GuardedBy("mSupportedAlgorithmLock")
private static Set<String> sSupportedHashAlgorithms;
/**
* @hide
*/
public DisplayHashManager() {
}
/**
* Get a Set of DisplayHash algorithms that the device supports.
*
* @return a String Set of supported hashing algorithms. The String value of one
* algorithm should be used when requesting to generate the DisplayHash.
*/
@NonNull
public Set<String> getSupportedHashAlgorithms() {
synchronized (mSupportedHashingAlgorithmLock) {
if (sSupportedHashAlgorithms != null) {
return sSupportedHashAlgorithms;
}
try {
String[] supportedAlgorithms = WindowManagerGlobal.getWindowManagerService()
.getSupportedDisplayHashAlgorithms();
if (supportedAlgorithms == null) {
return Collections.emptySet();
}
sSupportedHashAlgorithms = new ArraySet<>(supportedAlgorithms);
return sSupportedHashAlgorithms;
} catch (RemoteException e) {
Log.e(TAG, "Failed to send request getSupportedHashingAlgorithms", e);
throw e.rethrowFromSystemServer();
}
}
}
/**
* Call to verify that the DisplayHash passed in was generated by the system.
*
* @param displayHash The hash to verify that it was generated by the system.
* @return a {@link VerifiedDisplayHash} if the hash was generated by the system or null
* if the hash cannot be verified.
*/
@Nullable
public VerifiedDisplayHash verifyDisplayHash(@NonNull DisplayHash displayHash) {
try {
return WindowManagerGlobal.getWindowManagerService().verifyDisplayHash(displayHash);
} catch (RemoteException e) {
Log.e(TAG, "Failed to send request verifyImpressionToken", e);
throw e.rethrowFromSystemServer();
}
}
/**
* Call to enable or disable the throttling when generating a display hash. This should only be
* used for testing. Throttling is enabled by default.
*
* @hide
*/
@TestApi
@RequiresPermission(android.Manifest.permission.READ_FRAME_BUFFER)
public void setDisplayHashThrottlingEnabled(boolean enable) {
try {
WindowManagerGlobal.getWindowManagerService().setDisplayHashThrottlingEnabled(enable);
} catch (RemoteException e) {
}
}
}
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