Showing the changes to java/pkg/java/nio/file/TempFileHelper.java (1 of 18352 files). Show all
Unified · Split
| @@ -0,0 +1,175 @@ | ||
| 1 | +/* | |
| 2 | + * Copyright (c) 2009, 2011, Oracle and/or its affiliates. All rights reserved. | |
| 3 | + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
| 4 | + * | |
| 5 | + * This code is free software; you can redistribute it and/or modify it | |
| 6 | + * under the terms of the GNU General Public License version 2 only, as | |
| 7 | + * published by the Free Software Foundation. Oracle designates this | |
| 8 | + * particular file as subject to the "Classpath" exception as provided | |
| 9 | + * by Oracle in the LICENSE file that accompanied this code. | |
| 10 | + * | |
| 11 | + * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 12 | + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 13 | + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 14 | + * version 2 for more details (a copy is included in the LICENSE file that | |
| 15 | + * accompanied this code). | |
| 16 | + * | |
| 17 | + * You should have received a copy of the GNU General Public License version | |
| 18 | + * 2 along with this work; if not, write to the Free Software Foundation, | |
| 19 | + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 20 | + * | |
| 21 | + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 22 | + * or visit www.oracle.com if you need additional information or have any | |
| 23 | + * questions. | |
| 24 | + */ | |
| 25 | + | |
| 26 | +package java.nio.file; | |
| 27 | + | |
| 28 | +import java.util.Set; | |
| 29 | +import java.util.EnumSet; | |
| 30 | +import java.security.SecureRandom; | |
| 31 | +import static java.security.AccessController.*; | |
| 32 | +import java.io.IOException; | |
| 33 | +import java.nio.file.attribute.FileAttribute; | |
| 34 | +import java.nio.file.attribute.PosixFilePermission; | |
| 35 | +import java.nio.file.attribute.PosixFilePermissions; | |
| 36 | +import static java.nio.file.attribute.PosixFilePermission.*; | |
| 37 | +import sun.security.action.GetPropertyAction; | |
| 38 | + | |
| 39 | + | |
| 40 | +/** | |
| 41 | + * Helper class to support creation of temporary files and directories with | |
| 42 | + * initial attributes. | |
| 43 | + */ | |
| 44 | + | |
| 45 | +class TempFileHelper { | |
| 46 | + private TempFileHelper() { } | |
| 47 | + | |
| 48 | + // temporary directory location | |
| 49 | + private static final Path tmpdir = | |
| 50 | + Paths.get(doPrivileged(new GetPropertyAction("java.io.tmpdir"))); | |
| 51 | + | |
| 52 | + private static final boolean isPosix = | |
| 53 | + FileSystems.getDefault().supportedFileAttributeViews().contains("posix"); | |
| 54 | + | |
| 55 | + // file name generation, same as java.io.File for now | |
| 56 | + private static final SecureRandom random = new SecureRandom(); | |
| 57 | + private static Path generatePath(String prefix, String suffix, Path dir) { | |
| 58 | + long n = random.nextLong(); | |
| 59 | + n = (n == Long.MIN_VALUE) ? 0 : Math.abs(n); | |
| 60 | + Path name = dir.getFileSystem().getPath(prefix + Long.toString(n) + suffix); | |
| 61 | + // the generated name should be a simple file name | |
| 62 | + if (name.getParent() != null) | |
| 63 | + throw new IllegalArgumentException("Invalid prefix or suffix"); | |
| 64 | + return dir.resolve(name); | |
| 65 | + } | |
| 66 | + | |
| 67 | + // default file and directory permissions (lazily initialized) | |
| 68 | + private static class PosixPermissions { | |
| 69 | + static final FileAttribute<Set<PosixFilePermission>> filePermissions = | |
| 70 | + PosixFilePermissions.asFileAttribute(EnumSet.of(OWNER_READ, OWNER_WRITE)); | |
| 71 | + static final FileAttribute<Set<PosixFilePermission>> dirPermissions = | |
| 72 | + PosixFilePermissions.asFileAttribute(EnumSet | |
| 73 | + .of(OWNER_READ, OWNER_WRITE, OWNER_EXECUTE)); | |
| 74 | + } | |
| 75 | + | |
| 76 | + /** | |
| 77 | + * Creates a file or directory in in the given given directory (or in the | |
| 78 | + * temporary directory if dir is {@code null}). | |
| 79 | + */ | |
| 80 | + private static Path create(Path dir, | |
| 81 | + String prefix, | |
| 82 | + String suffix, | |
| 83 | + boolean createDirectory, | |
| 84 | + FileAttribute[] attrs) | |
| 85 | + throws IOException | |
| 86 | + { | |
| 87 | + if (prefix == null) | |
| 88 | + prefix = ""; | |
| 89 | + if (suffix == null) | |
| 90 | + suffix = (createDirectory) ? "" : ".tmp"; | |
| 91 | + if (dir == null) | |
| 92 | + dir = tmpdir; | |
| 93 | + | |
| 94 | + // in POSIX environments use default file and directory permissions | |
| 95 | + // if initial permissions not given by caller. | |
| 96 | + if (isPosix && (dir.getFileSystem() == FileSystems.getDefault())) { | |
| 97 | + if (attrs.length == 0) { | |
| 98 | + // no attributes so use default permissions | |
| 99 | + attrs = new FileAttribute<?>[1]; | |
| 100 | + attrs[0] = (createDirectory) ? PosixPermissions.dirPermissions : | |
| 101 | + PosixPermissions.filePermissions; | |
| 102 | + } else { | |
| 103 | + // check if posix permissions given; if not use default | |
| 104 | + boolean hasPermissions = false; | |
| 105 | + for (int i=0; i<attrs.length; i++) { | |
| 106 | + if (attrs[i].name().equals("posix:permissions")) { | |
| 107 | + hasPermissions = true; | |
| 108 | + break; | |
| 109 | + } | |
| 110 | + } | |
| 111 | + if (!hasPermissions) { | |
| 112 | + FileAttribute<?>[] copy = new FileAttribute<?>[attrs.length+1]; | |
| 113 | + System.arraycopy(attrs, 0, copy, 0, attrs.length); | |
| 114 | + attrs = copy; | |
| 115 | + attrs[attrs.length-1] = (createDirectory) ? | |
| 116 | + PosixPermissions.dirPermissions : | |
| 117 | + PosixPermissions.filePermissions; | |
| 118 | + } | |
| 119 | + } | |
| 120 | + } | |
| 121 | + | |
| 122 | + // loop generating random names until file or directory can be created | |
| 123 | + SecurityManager sm = System.getSecurityManager(); | |
| 124 | + for (;;) { | |
| 125 | + Path f; | |
| 126 | + try { | |
| 127 | + f = generatePath(prefix, suffix, dir); | |
| 128 | + } catch (InvalidPathException e) { | |
| 129 | + // don't reveal temporary directory location | |
| 130 | + if (sm != null) | |
| 131 | + throw new IllegalArgumentException("Invalid prefix or suffix"); | |
| 132 | + throw e; | |
| 133 | + } | |
| 134 | + try { | |
| 135 | + if (createDirectory) { | |
| 136 | + return Files.createDirectory(f, attrs); | |
| 137 | + } else { | |
| 138 | + return Files.createFile(f, attrs); | |
| 139 | + } | |
| 140 | + } catch (SecurityException e) { | |
| 141 | + // don't reveal temporary directory location | |
| 142 | + if (dir == tmpdir && sm != null) | |
| 143 | + throw new SecurityException("Unable to create temporary file or directory"); | |
| 144 | + throw e; | |
| 145 | + } catch (FileAlreadyExistsException e) { | |
| 146 | + // ignore | |
| 147 | + } | |
| 148 | + } | |
| 149 | + } | |
| 150 | + | |
| 151 | + /** | |
| 152 | + * Creates a temporary file in the given directory, or in in the | |
| 153 | + * temporary directory if dir is {@code null}. | |
| 154 | + */ | |
| 155 | + static Path createTempFile(Path dir, | |
| 156 | + String prefix, | |
| 157 | + String suffix, | |
| 158 | + FileAttribute[] attrs) | |
| 159 | + throws IOException | |
| 160 | + { | |
| 161 | + return create(dir, prefix, suffix, false, attrs); | |
| 162 | + } | |
| 163 | + | |
| 164 | + /** | |
| 165 | + * Creates a temporary directory in the given directory, or in in the | |
| 166 | + * temporary directory if dir is {@code null}. | |
| 167 | + */ | |
| 168 | + static Path createTempDirectory(Path dir, | |
| 169 | + String prefix, | |
| 170 | + FileAttribute[] attrs) | |
| 171 | + throws IOException | |
| 172 | + { | |
| 173 | + return create(dir, prefix, null, true, attrs); | |
| 174 | + } | |
| 175 | +} | |