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      1 /*
      2  * Copyright (C) 2010 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.server.am;
     18 
     19 import android.content.Intent;
     20 import android.net.Uri;
     21 import android.os.Binder;
     22 import android.os.IBinder;
     23 import android.util.ArraySet;
     24 
     25 import com.google.android.collect.Sets;
     26 
     27 import java.io.PrintWriter;
     28 import java.util.Iterator;
     29 
     30 final class UriPermissionOwner {
     31     final ActivityManagerService service;
     32     final Object owner;
     33 
     34     Binder externalToken;
     35 
     36     private ArraySet<UriPermission> mReadPerms;
     37     private ArraySet<UriPermission> mWritePerms;
     38 
     39     class ExternalToken extends Binder {
     40         UriPermissionOwner getOwner() {
     41             return UriPermissionOwner.this;
     42         }
     43     }
     44 
     45     UriPermissionOwner(ActivityManagerService service, Object owner) {
     46         this.service = service;
     47         this.owner = owner;
     48     }
     49 
     50     Binder getExternalTokenLocked() {
     51         if (externalToken == null) {
     52             externalToken = new ExternalToken();
     53         }
     54         return externalToken;
     55     }
     56 
     57     static UriPermissionOwner fromExternalToken(IBinder token) {
     58         if (token instanceof ExternalToken) {
     59             return ((ExternalToken)token).getOwner();
     60         }
     61         return null;
     62     }
     63 
     64     void removeUriPermissionsLocked() {
     65         removeUriPermissionsLocked(Intent.FLAG_GRANT_READ_URI_PERMISSION
     66                 | Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
     67     }
     68 
     69     void removeUriPermissionsLocked(int mode) {
     70         removeUriPermissionLocked(null, mode);
     71     }
     72 
     73     void removeUriPermissionLocked(ActivityManagerService.GrantUri grantUri, int mode) {
     74         if ((mode & Intent.FLAG_GRANT_READ_URI_PERMISSION) != 0
     75                 && mReadPerms != null) {
     76             Iterator<UriPermission> it = mReadPerms.iterator();
     77             while (it.hasNext()) {
     78                 UriPermission perm = it.next();
     79                 if (grantUri == null || grantUri.equals(perm.uri)) {
     80                     perm.removeReadOwner(this);
     81                     service.removeUriPermissionIfNeededLocked(perm);
     82                     it.remove();
     83                 }
     84             }
     85             if (mReadPerms.isEmpty()) {
     86                 mReadPerms = null;
     87             }
     88         }
     89         if ((mode & Intent.FLAG_GRANT_WRITE_URI_PERMISSION) != 0
     90                 && mWritePerms != null) {
     91             Iterator<UriPermission> it = mWritePerms.iterator();
     92             while (it.hasNext()) {
     93                 UriPermission perm = it.next();
     94                 if (grantUri == null || grantUri.equals(perm.uri)) {
     95                     perm.removeWriteOwner(this);
     96                     service.removeUriPermissionIfNeededLocked(perm);
     97                     it.remove();
     98                 }
     99             }
    100             if (mWritePerms.isEmpty()) {
    101                 mWritePerms = null;
    102             }
    103         }
    104     }
    105 
    106     public void addReadPermission(UriPermission perm) {
    107         if (mReadPerms == null) {
    108             mReadPerms = Sets.newArraySet();
    109         }
    110         mReadPerms.add(perm);
    111     }
    112 
    113     public void addWritePermission(UriPermission perm) {
    114         if (mWritePerms == null) {
    115             mWritePerms = Sets.newArraySet();
    116         }
    117         mWritePerms.add(perm);
    118     }
    119 
    120     public void removeReadPermission(UriPermission perm) {
    121         mReadPerms.remove(perm);
    122         if (mReadPerms.isEmpty()) {
    123             mReadPerms = null;
    124         }
    125     }
    126 
    127     public void removeWritePermission(UriPermission perm) {
    128         mWritePerms.remove(perm);
    129         if (mWritePerms.isEmpty()) {
    130             mWritePerms = null;
    131         }
    132     }
    133 
    134     public void dump(PrintWriter pw, String prefix) {
    135         if (mReadPerms != null) {
    136             pw.print(prefix); pw.print("readUriPermissions="); pw.println(mReadPerms);
    137         }
    138         if (mWritePerms != null) {
    139             pw.print(prefix); pw.print("writeUriPermissions="); pw.println(mWritePerms);
    140         }
    141     }
    142 
    143     @Override
    144     public String toString() {
    145         return owner.toString();
    146     }
    147 }
    148