Dianne Hackborn | 7e26964 | 2010-08-25 19:50:20 -0700 | [diff] [blame] | 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 | |
Dianne Hackborn | be4e6aa | 2013-06-07 13:25:29 -0700 | [diff] [blame] | 27 | final class UriPermissionOwner { |
Dianne Hackborn | 7e26964 | 2010-08-25 19:50:20 -0700 | [diff] [blame] | 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 { |
| 37 | UriPermissionOwner getOwner() { |
| 38 | return UriPermissionOwner.this; |
| 39 | } |
| 40 | } |
| 41 | |
| 42 | UriPermissionOwner(ActivityManagerService _service, Object _owner) { |
| 43 | service = _service; |
| 44 | owner = _owner; |
| 45 | } |
| 46 | |
| 47 | Binder getExternalTokenLocked() { |
Dianne Hackborn | 90f4aaf | 2010-09-27 14:58:44 -0700 | [diff] [blame] | 48 | if (externalToken == null) { |
Dianne Hackborn | 7e26964 | 2010-08-25 19:50:20 -0700 | [diff] [blame] | 49 | externalToken = new ExternalToken(); |
| 50 | } |
| 51 | return externalToken; |
| 52 | } |
| 53 | |
| 54 | static UriPermissionOwner fromExternalToken(IBinder token) { |
| 55 | if (token instanceof ExternalToken) { |
| 56 | return ((ExternalToken)token).getOwner(); |
| 57 | } |
| 58 | return null; |
| 59 | } |
| 60 | |
| 61 | void removeUriPermissionsLocked() { |
| 62 | removeUriPermissionsLocked(Intent.FLAG_GRANT_READ_URI_PERMISSION |
| 63 | | Intent.FLAG_GRANT_WRITE_URI_PERMISSION); |
| 64 | } |
| 65 | |
| 66 | void removeUriPermissionsLocked(int mode) { |
| 67 | if ((mode&Intent.FLAG_GRANT_READ_URI_PERMISSION) != 0 |
| 68 | && readUriPermissions != null) { |
| 69 | for (UriPermission perm : readUriPermissions) { |
Jeff Sharkey | 328ebf2 | 2013-03-21 18:09:39 -0700 | [diff] [blame] | 70 | perm.removeReadOwner(this); |
| 71 | service.removeUriPermissionIfNeededLocked(perm); |
Dianne Hackborn | 7e26964 | 2010-08-25 19:50:20 -0700 | [diff] [blame] | 72 | } |
| 73 | readUriPermissions = null; |
| 74 | } |
| 75 | if ((mode&Intent.FLAG_GRANT_WRITE_URI_PERMISSION) != 0 |
| 76 | && writeUriPermissions != null) { |
| 77 | for (UriPermission perm : writeUriPermissions) { |
Jeff Sharkey | 328ebf2 | 2013-03-21 18:09:39 -0700 | [diff] [blame] | 78 | perm.removeWriteOwner(this); |
| 79 | service.removeUriPermissionIfNeededLocked(perm); |
Dianne Hackborn | 7e26964 | 2010-08-25 19:50:20 -0700 | [diff] [blame] | 80 | } |
| 81 | writeUriPermissions = null; |
| 82 | } |
| 83 | } |
| 84 | |
| 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)) { |
Jeff Sharkey | 328ebf2 | 2013-03-21 18:09:39 -0700 | [diff] [blame] | 92 | perm.removeReadOwner(this); |
| 93 | service.removeUriPermissionIfNeededLocked(perm); |
Dianne Hackborn | 7e26964 | 2010-08-25 19:50:20 -0700 | [diff] [blame] | 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)) { |
Jeff Sharkey | 328ebf2 | 2013-03-21 18:09:39 -0700 | [diff] [blame] | 107 | perm.removeWriteOwner(this); |
| 108 | service.removeUriPermissionIfNeededLocked(perm); |
Dianne Hackborn | 7e26964 | 2010-08-25 19:50:20 -0700 | [diff] [blame] | 109 | it.remove(); |
| 110 | } |
| 111 | } |
| 112 | if (writeUriPermissions.size() == 0) { |
| 113 | writeUriPermissions = null; |
| 114 | } |
| 115 | } |
| 116 | } |
| 117 | |
| 118 | public void addReadPermission(UriPermission perm) { |
| 119 | if (readUriPermissions == null) { |
| 120 | readUriPermissions = new HashSet<UriPermission>(); |
| 121 | } |
| 122 | readUriPermissions.add(perm); |
| 123 | } |
| 124 | |
| 125 | public void addWritePermission(UriPermission perm) { |
| 126 | if (writeUriPermissions == null) { |
| 127 | writeUriPermissions = new HashSet<UriPermission>(); |
| 128 | } |
| 129 | writeUriPermissions.add(perm); |
| 130 | } |
| 131 | |
| 132 | public void removeReadPermission(UriPermission perm) { |
| 133 | readUriPermissions.remove(perm); |
| 134 | if (readUriPermissions.size() == 0) { |
| 135 | readUriPermissions = null; |
| 136 | } |
| 137 | } |
| 138 | |
| 139 | public void removeWritePermission(UriPermission perm) { |
| 140 | writeUriPermissions.remove(perm); |
| 141 | if (writeUriPermissions.size() == 0) { |
| 142 | writeUriPermissions = null; |
| 143 | } |
| 144 | } |
| 145 | |
| 146 | @Override |
| 147 | public String toString() { |
| 148 | return owner.toString(); |
| 149 | } |
| 150 | } |