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 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.readOwners.remove(this); 71 if (perm.readOwners.size() == 0 && (perm.globalModeFlags 72 &Intent.FLAG_GRANT_READ_URI_PERMISSION) == 0) { 73 perm.modeFlags &= ~Intent.FLAG_GRANT_READ_URI_PERMISSION; 74 service.removeUriPermissionIfNeededLocked(perm); 75 } 76 } 77 readUriPermissions = null; 78 } 79 if ((mode&Intent.FLAG_GRANT_WRITE_URI_PERMISSION) != 0 80 && writeUriPermissions != null) { 81 for (UriPermission perm : writeUriPermissions) { 82 perm.writeOwners.remove(this); 83 if (perm.writeOwners.size() == 0 && (perm.globalModeFlags 84 &Intent.FLAG_GRANT_WRITE_URI_PERMISSION) == 0) { 85 perm.modeFlags &= ~Intent.FLAG_GRANT_WRITE_URI_PERMISSION; 86 service.removeUriPermissionIfNeededLocked(perm); 87 } 88 } 89 writeUriPermissions = null; 90 } 91 } 92 removeUriPermissionLocked(Uri uri, int mode)93 void removeUriPermissionLocked(Uri uri, int mode) { 94 if ((mode&Intent.FLAG_GRANT_READ_URI_PERMISSION) != 0 95 && readUriPermissions != null) { 96 Iterator<UriPermission> it = readUriPermissions.iterator(); 97 while (it.hasNext()) { 98 UriPermission perm = it.next(); 99 if (uri.equals(perm.uri)) { 100 perm.readOwners.remove(this); 101 if (perm.readOwners.size() == 0 && (perm.globalModeFlags 102 &Intent.FLAG_GRANT_READ_URI_PERMISSION) == 0) { 103 perm.modeFlags &= ~Intent.FLAG_GRANT_READ_URI_PERMISSION; 104 service.removeUriPermissionIfNeededLocked(perm); 105 } 106 it.remove(); 107 } 108 } 109 if (readUriPermissions.size() == 0) { 110 readUriPermissions = null; 111 } 112 } 113 if ((mode&Intent.FLAG_GRANT_WRITE_URI_PERMISSION) != 0 114 && writeUriPermissions != null) { 115 Iterator<UriPermission> it = writeUriPermissions.iterator(); 116 while (it.hasNext()) { 117 UriPermission perm = it.next(); 118 if (uri.equals(perm.uri)) { 119 perm.writeOwners.remove(this); 120 if (perm.writeOwners.size() == 0 && (perm.globalModeFlags 121 &Intent.FLAG_GRANT_WRITE_URI_PERMISSION) == 0) { 122 perm.modeFlags &= ~Intent.FLAG_GRANT_WRITE_URI_PERMISSION; 123 service.removeUriPermissionIfNeededLocked(perm); 124 } 125 it.remove(); 126 } 127 } 128 if (writeUriPermissions.size() == 0) { 129 writeUriPermissions = null; 130 } 131 } 132 } 133 addReadPermission(UriPermission perm)134 public void addReadPermission(UriPermission perm) { 135 if (readUriPermissions == null) { 136 readUriPermissions = new HashSet<UriPermission>(); 137 } 138 readUriPermissions.add(perm); 139 } 140 addWritePermission(UriPermission perm)141 public void addWritePermission(UriPermission perm) { 142 if (writeUriPermissions == null) { 143 writeUriPermissions = new HashSet<UriPermission>(); 144 } 145 writeUriPermissions.add(perm); 146 } 147 removeReadPermission(UriPermission perm)148 public void removeReadPermission(UriPermission perm) { 149 readUriPermissions.remove(perm); 150 if (readUriPermissions.size() == 0) { 151 readUriPermissions = null; 152 } 153 } 154 removeWritePermission(UriPermission perm)155 public void removeWritePermission(UriPermission perm) { 156 writeUriPermissions.remove(perm); 157 if (writeUriPermissions.size() == 0) { 158 writeUriPermissions = null; 159 } 160 } 161 162 @Override toString()163 public String toString() { 164 return owner.toString(); 165 } 166 } 167