/*
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** Copyright 2015, The Android Open Source Project
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**
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** Licensed under the Apache License, Version 2.0 (the "License");
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** you may not use this file except in compliance with the License.
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** You may obtain a copy of the License at
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**
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** http://www.apache.org/licenses/LICENSE-2.0
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**
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** Unless required by applicable law or agreed to in writing, software
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** distributed under the License is distributed on an "AS IS" BASIS,
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** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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** See the License for the specific language governing permissions and
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** limitations under the License.
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*/
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package com.android.server.wm;
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import android.app.ActivityManager;
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import android.app.ActivityTaskManager;
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import android.app.UriGrantsManager;
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import android.content.ClipData;
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import android.net.Uri;
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import android.os.Binder;
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import android.os.IBinder;
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import android.os.RemoteException;
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import com.android.internal.view.IDragAndDropPermissions;
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import com.android.server.LocalServices;
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import com.android.server.uri.UriGrantsManagerInternal;
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import java.util.ArrayList;
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class DragAndDropPermissionsHandler extends IDragAndDropPermissions.Stub
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implements IBinder.DeathRecipient {
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private final int mSourceUid;
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private final String mTargetPackage;
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private final int mMode;
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private final int mSourceUserId;
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private final int mTargetUserId;
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private final ArrayList<Uri> mUris = new ArrayList<Uri>();
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private IBinder mActivityToken = null;
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private IBinder mPermissionOwnerToken = null;
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private IBinder mTransientToken = null;
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DragAndDropPermissionsHandler(ClipData clipData, int sourceUid, String targetPackage, int mode,
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int sourceUserId, int targetUserId) {
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mSourceUid = sourceUid;
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mTargetPackage = targetPackage;
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mMode = mode;
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mSourceUserId = sourceUserId;
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mTargetUserId = targetUserId;
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clipData.collectUris(mUris);
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}
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@Override
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public void take(IBinder activityToken) throws RemoteException {
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if (mActivityToken != null || mPermissionOwnerToken != null) {
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return;
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}
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mActivityToken = activityToken;
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// Will throw if Activity is not found.
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IBinder permissionOwner = ActivityTaskManager.getService().
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getUriPermissionOwnerForActivity(mActivityToken);
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doTake(permissionOwner);
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}
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private void doTake(IBinder permissionOwner) throws RemoteException {
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long origId = Binder.clearCallingIdentity();
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try {
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for (int i = 0; i < mUris.size(); i++) {
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UriGrantsManager.getService().grantUriPermissionFromOwner(
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permissionOwner, mSourceUid, mTargetPackage, mUris.get(i), mMode,
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mSourceUserId, mTargetUserId);
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}
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} finally {
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Binder.restoreCallingIdentity(origId);
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}
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}
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@Override
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public void takeTransient(IBinder transientToken) throws RemoteException {
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if (mActivityToken != null || mPermissionOwnerToken != null) {
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return;
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}
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mPermissionOwnerToken = LocalServices.getService(UriGrantsManagerInternal.class)
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.newUriPermissionOwner("drop");
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mTransientToken = transientToken;
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mTransientToken.linkToDeath(this, 0);
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doTake(mPermissionOwnerToken);
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}
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@Override
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public void release() throws RemoteException {
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if (mActivityToken == null && mPermissionOwnerToken == null) {
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return;
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}
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IBinder permissionOwner = null;
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if (mActivityToken != null) {
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try {
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permissionOwner = ActivityTaskManager.getService().
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getUriPermissionOwnerForActivity(mActivityToken);
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} catch (Exception e) {
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// Activity is destroyed, permissions already revoked.
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return;
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} finally {
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mActivityToken = null;
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}
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} else {
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permissionOwner = mPermissionOwnerToken;
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mPermissionOwnerToken = null;
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mTransientToken.unlinkToDeath(this, 0);
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mTransientToken = null;
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}
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UriGrantsManagerInternal ugm = LocalServices.getService(UriGrantsManagerInternal.class);
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for (int i = 0; i < mUris.size(); ++i) {
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ugm.revokeUriPermissionFromOwner(permissionOwner, mUris.get(i), mMode, mSourceUserId);
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}
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}
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@Override
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public void binderDied() {
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try {
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release();
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} catch (RemoteException e) {
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// Cannot happen, local call.
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}
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}
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}
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