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 24 import java.util.HashSet; 25 import java.util.Iterator; 26 27 final class UriPermissionOwner { 28 final ActivityManagerService service; 29 final Object owner; 30 31 Binder externalToken; 32 33 HashSet<UriPermission> readUriPermissions; // special access to reading uris. 34 HashSet<UriPermission> writeUriPermissions; // special access to writing uris. 35 36 class ExternalToken extends Binder { getOwner()37 UriPermissionOwner getOwner() { 38 return UriPermissionOwner.this; 39 } 40 } 41 UriPermissionOwner(ActivityManagerService _service, Object _owner)42 UriPermissionOwner(ActivityManagerService _service, Object _owner) { 43 service = _service; 44 owner = _owner; 45 } 46 getExternalTokenLocked()47 Binder getExternalTokenLocked() { 48 if (externalToken == null) { 49 externalToken = new ExternalToken(); 50 } 51 return externalToken; 52 } 53 fromExternalToken(IBinder token)54 static UriPermissionOwner fromExternalToken(IBinder token) { 55 if (token instanceof ExternalToken) { 56 return ((ExternalToken)token).getOwner(); 57 } 58 return null; 59 } 60 removeUriPermissionsLocked()61 void removeUriPermissionsLocked() { 62 removeUriPermissionsLocked(Intent.FLAG_GRANT_READ_URI_PERMISSION 63 | Intent.FLAG_GRANT_WRITE_URI_PERMISSION); 64 } 65 removeUriPermissionsLocked(int mode)66 void removeUriPermissionsLocked(int mode) { 67 if ((mode&Intent.FLAG_GRANT_READ_URI_PERMISSION) != 0 68 && readUriPermissions != null) { 69 for (UriPermission perm : readUriPermissions) { 70 perm.removeReadOwner(this); 71 service.removeUriPermissionIfNeededLocked(perm); 72 } 73 readUriPermissions = null; 74 } 75 if ((mode&Intent.FLAG_GRANT_WRITE_URI_PERMISSION) != 0 76 && writeUriPermissions != null) { 77 for (UriPermission perm : writeUriPermissions) { 78 perm.removeWriteOwner(this); 79 service.removeUriPermissionIfNeededLocked(perm); 80 } 81 writeUriPermissions = null; 82 } 83 } 84 removeUriPermissionLocked(Uri uri, int mode)85 void removeUriPermissionLocked(Uri uri, int mode) { 86 if ((mode&Intent.FLAG_GRANT_READ_URI_PERMISSION) != 0 87 && readUriPermissions != null) { 88 Iterator<UriPermission> it = readUriPermissions.iterator(); 89 while (it.hasNext()) { 90 UriPermission perm = it.next(); 91 if (uri.equals(perm.uri)) { 92 perm.removeReadOwner(this); 93 service.removeUriPermissionIfNeededLocked(perm); 94 it.remove(); 95 } 96 } 97 if (readUriPermissions.size() == 0) { 98 readUriPermissions = null; 99 } 100 } 101 if ((mode&Intent.FLAG_GRANT_WRITE_URI_PERMISSION) != 0 102 && writeUriPermissions != null) { 103 Iterator<UriPermission> it = writeUriPermissions.iterator(); 104 while (it.hasNext()) { 105 UriPermission perm = it.next(); 106 if (uri.equals(perm.uri)) { 107 perm.removeWriteOwner(this); 108 service.removeUriPermissionIfNeededLocked(perm); 109 it.remove(); 110 } 111 } 112 if (writeUriPermissions.size() == 0) { 113 writeUriPermissions = null; 114 } 115 } 116 } 117 addReadPermission(UriPermission perm)118 public void addReadPermission(UriPermission perm) { 119 if (readUriPermissions == null) { 120 readUriPermissions = new HashSet<UriPermission>(); 121 } 122 readUriPermissions.add(perm); 123 } 124 addWritePermission(UriPermission perm)125 public void addWritePermission(UriPermission perm) { 126 if (writeUriPermissions == null) { 127 writeUriPermissions = new HashSet<UriPermission>(); 128 } 129 writeUriPermissions.add(perm); 130 } 131 removeReadPermission(UriPermission perm)132 public void removeReadPermission(UriPermission perm) { 133 readUriPermissions.remove(perm); 134 if (readUriPermissions.size() == 0) { 135 readUriPermissions = null; 136 } 137 } 138 removeWritePermission(UriPermission perm)139 public void removeWritePermission(UriPermission perm) { 140 writeUriPermissions.remove(perm); 141 if (writeUriPermissions.size() == 0) { 142 writeUriPermissions = null; 143 } 144 } 145 146 @Override toString()147 public String toString() { 148 return owner.toString(); 149 } 150 } 151