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1 | <?php |
2 | |
3 | /** |
4 | * Location holder of files stored temporarily |
5 | * |
6 | * This program is free software; you can redistribute it and/or modify |
7 | * it under the terms of the GNU General Public License as published by |
8 | * the Free Software Foundation; either version 2 of the License, or |
9 | * (at your option) any later version. |
10 | * |
11 | * This program is distributed in the hope that it will be useful, |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 | * GNU General Public License for more details. |
15 | * |
16 | * You should have received a copy of the GNU General Public License along |
17 | * with this program; if not, write to the Free Software Foundation, Inc., |
18 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
19 | * http://www.gnu.org/copyleft/gpl.html |
20 | * |
21 | * @file |
22 | * @ingroup FileBackend |
23 | */ |
24 | |
25 | namespace Wikimedia\FileBackend\FSFile; |
26 | |
27 | use MediaWiki\FileBackend\FSFile\TempFSFileFactory; |
28 | use RuntimeException; |
29 | use WeakMap; |
30 | use Wikimedia\AtEase\AtEase; |
31 | |
32 | /** |
33 | * This class is used to hold the location and do limited manipulation |
34 | * of files stored temporarily (this will be whatever wfTempDir() returns) |
35 | * |
36 | * @ingroup FileBackend |
37 | */ |
38 | class TempFSFile extends FSFile { |
39 | /** @var bool Garbage collect the temp file */ |
40 | protected $canDelete = false; |
41 | |
42 | /** @var array Map of (path => 1) for paths to delete on shutdown */ |
43 | protected static $pathsCollect = null; |
44 | |
45 | /** |
46 | * A WeakMap where the key is an object which depends on the file, and the |
47 | * value is a TempFSFile responsible for deleting the file. This keeps each |
48 | * TempFSFile alive until all associated objects have been destroyed. |
49 | * @var WeakMap|null |
50 | */ |
51 | private static $references; |
52 | |
53 | /** |
54 | * Do not call directly. Use TempFSFileFactory |
55 | * |
56 | * @param string $path |
57 | */ |
58 | public function __construct( $path ) { |
59 | parent::__construct( $path ); |
60 | |
61 | if ( self::$pathsCollect === null ) { |
62 | // @codeCoverageIgnoreStart |
63 | self::$pathsCollect = []; |
64 | register_shutdown_function( [ __CLASS__, 'purgeAllOnShutdown' ] ); |
65 | // @codeCoverageIgnoreEnd |
66 | } |
67 | } |
68 | |
69 | /** |
70 | * Make a new temporary file on the file system. |
71 | * Temporary files may be purged when the file object falls out of scope. |
72 | * |
73 | * @deprecated since 1.34, use TempFSFileFactory directly |
74 | * |
75 | * @param string $prefix |
76 | * @param string $extension Optional file extension |
77 | * @param string|null $tmpDirectory Optional parent directory |
78 | * @return TempFSFile|null |
79 | */ |
80 | public static function factory( $prefix, $extension = '', $tmpDirectory = null ) { |
81 | return ( new TempFSFileFactory( $tmpDirectory ) )->newTempFSFile( $prefix, $extension ); |
82 | } |
83 | |
84 | /** |
85 | * @todo Is there any useful way to test this? Would it be useful to make this non-static on |
86 | * TempFSFileFactory? |
87 | * |
88 | * @return string Filesystem path to a temporary directory |
89 | * @throws RuntimeException if no writable temporary directory can be found |
90 | */ |
91 | public static function getUsableTempDirectory() { |
92 | $tmpDir = array_map( 'getenv', [ 'TMPDIR', 'TMP', 'TEMP' ] ); |
93 | $tmpDir[] = sys_get_temp_dir(); |
94 | $tmpDir[] = ini_get( 'upload_tmp_dir' ); |
95 | foreach ( $tmpDir as $tmp ) { |
96 | if ( $tmp != '' && is_dir( $tmp ) && is_writable( $tmp ) ) { |
97 | return $tmp; |
98 | } |
99 | } |
100 | |
101 | // PHP on Windows will detect C:\Windows\Temp as not writable even though PHP can write to |
102 | // it so create a directory within that called 'mwtmp' with a suffix of the user running |
103 | // the current process. |
104 | // The user is included as if various scripts are run by different users they will likely |
105 | // not be able to access each others temporary files. |
106 | if ( PHP_OS_FAMILY === 'Windows' ) { |
107 | $tmp = sys_get_temp_dir() . DIRECTORY_SEPARATOR . 'mwtmp-' . get_current_user(); |
108 | if ( !is_dir( $tmp ) ) { |
109 | mkdir( $tmp ); |
110 | } |
111 | if ( is_dir( $tmp ) && is_writable( $tmp ) ) { |
112 | return $tmp; |
113 | } |
114 | } |
115 | |
116 | throw new RuntimeException( |
117 | 'No writable temporary directory could be found. ' . |
118 | 'Please explicitly specify a writable directory in configuration.' ); |
119 | } |
120 | |
121 | /** |
122 | * Purge this file off the file system |
123 | * |
124 | * @return bool Success |
125 | */ |
126 | public function purge() { |
127 | $this->canDelete = false; // done |
128 | AtEase::suppressWarnings(); |
129 | $ok = unlink( $this->path ); |
130 | AtEase::restoreWarnings(); |
131 | |
132 | unset( self::$pathsCollect[$this->path] ); |
133 | |
134 | return $ok; |
135 | } |
136 | |
137 | /** |
138 | * Clean up the temporary file only after an object goes out of scope |
139 | * |
140 | * @param mixed $object |
141 | * @return TempFSFile This object |
142 | */ |
143 | public function bind( $object ) { |
144 | if ( is_object( $object ) ) { |
145 | // Use a WeakMap on PHP >= 8.0 to avoid dynamic property creation (T324894) |
146 | if ( PHP_VERSION_ID >= 80000 ) { |
147 | if ( self::$references === null ) { |
148 | self::$references = new WeakMap; |
149 | } |
150 | self::$references[$object] = $this; |
151 | } else { |
152 | // PHP 7.4 |
153 | if ( !isset( $object->tempFSFileReferences ) ) { |
154 | // Init first since $object might use __get() and return only a copy variable |
155 | $object->tempFSFileReferences = []; |
156 | } |
157 | $object->tempFSFileReferences[] = $this; |
158 | } |
159 | } |
160 | |
161 | return $this; |
162 | } |
163 | |
164 | /** |
165 | * Set flag to not clean up after the temporary file |
166 | * |
167 | * @return TempFSFile This object |
168 | */ |
169 | public function preserve() { |
170 | $this->canDelete = false; |
171 | |
172 | unset( self::$pathsCollect[$this->path] ); |
173 | |
174 | return $this; |
175 | } |
176 | |
177 | /** |
178 | * Set flag clean up after the temporary file |
179 | * |
180 | * @return TempFSFile This object |
181 | */ |
182 | public function autocollect() { |
183 | $this->canDelete = true; |
184 | |
185 | self::$pathsCollect[$this->path] = 1; |
186 | |
187 | return $this; |
188 | } |
189 | |
190 | /** |
191 | * Try to make sure that all files are purged on error |
192 | * |
193 | * This method should only be called internally |
194 | * |
195 | * @codeCoverageIgnore |
196 | */ |
197 | public static function purgeAllOnShutdown() { |
198 | foreach ( self::$pathsCollect as $path => $unused ) { |
199 | AtEase::suppressWarnings(); |
200 | unlink( $path ); |
201 | AtEase::restoreWarnings(); |
202 | } |
203 | } |
204 | |
205 | /** |
206 | * Cleans up after the temporary file by deleting it |
207 | */ |
208 | public function __destruct() { |
209 | if ( $this->canDelete ) { |
210 | $this->purge(); |
211 | } |
212 | } |
213 | } |
214 | |
215 | /** @deprecated class alias since 1.43 */ |
216 | class_alias( TempFSFile::class, 'TempFSFile' ); |