summaryrefslogtreecommitdiff
path: root/includes/revisiondelete/RevisionDeleter.php
blob: db2bc6a4dbf99f98a51cc73cbf9d859d1687cc8a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
<?php
/**
 * Revision/log/file deletion backend
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 * http://www.gnu.org/copyleft/gpl.html
 *
 * @file
 * @ingroup RevisionDelete
 */

/**
 * General controller for RevDel, used by both SpecialRevisiondelete and
 * ApiRevisionDelete.
 * @ingroup RevisionDelete
 */
class RevisionDeleter {
	/** List of known revdel types, with their corresponding list classes */
	private static $allowedTypes = array(
		'revision' => 'RevDelRevisionList',
		'archive' => 'RevDelArchiveList',
		'oldimage' => 'RevDelFileList',
		'filearchive' => 'RevDelArchivedFileList',
		'logging' => 'RevDelLogList',
	);

	/** Type map to support old log entries */
	private static $deprecatedTypeMap = array(
		'oldid' => 'revision',
		'artimestamp' => 'archive',
		'oldimage' => 'oldimage',
		'fileid' => 'filearchive',
		'logid' => 'logging',
	);

	/**
	 * Lists the valid possible types for revision deletion.
	 *
	 * @since 1.22
	 * @return array
	 */
	public static function getTypes() {
		return array_keys( self::$allowedTypes );
	}

	/**
	 * Gets the canonical type name, if any.
	 *
	 * @since 1.22
	 * @param string $typeName
	 * @return string|null
	 */
	public static function getCanonicalTypeName( $typeName ) {
		if ( isset( self::$deprecatedTypeMap[$typeName] ) ) {
			$typeName = self::$deprecatedTypeMap[$typeName];
		}
		return isset( self::$allowedTypes[$typeName] ) ? $typeName : null;
	}

	/**
	 * Instantiate the appropriate list class for a given list of IDs.
	 *
	 * @since 1.22
	 * @param string $typeName RevDel type, see RevisionDeleter::getTypes()
	 * @param IContextSource $context
	 * @param Title $title
	 * @param array $ids
	 * @return RevDelList
	 * @throws MWException
	 */
	public static function createList( $typeName, IContextSource $context, Title $title, array $ids ) {
		$typeName = self::getCanonicalTypeName( $typeName );
		if ( !$typeName ) {
			throw new MWException( __METHOD__ . ": Unknown RevDel type '$typeName'" );
		}
		return new self::$allowedTypes[$typeName]( $context, $title, $ids );
	}

	/**
	 * Checks for a change in the bitfield for a certain option and updates the
	 * provided array accordingly.
	 *
	 * @param string $desc Description to add to the array if the option was
	 * enabled / disabled.
	 * @param int $field The bitmask describing the single option.
	 * @param int $diff The xor of the old and new bitfields.
	 * @param int $new The new bitfield
	 * @param array $arr The array to update.
	 */
	protected static function checkItem( $desc, $field, $diff, $new, &$arr ) {
		if ( $diff & $field ) {
			$arr[( $new & $field ) ? 0 : 1][] = $desc;
		}
	}

	/**
	 * Gets an array of message keys describing the changes made to the
	 * visibility of the revision.
	 *
	 * If the resulting array is $arr, then $arr[0] will contain an array of
	 * keys describing the items that were hidden, $arr[1] will contain
	 * an array of keys describing the items that were unhidden, and $arr[2]
	 * will contain an array with a single message key, which can be one of
	 * "revdelete-restricted", "revdelete-unrestricted" indicating (un)suppression
	 * or null to indicate nothing in particular.
	 * You can turn the keys in $arr[0] and $arr[1] into message keys by
	 * appending -hid and -unhid to the keys respectively.
	 *
	 * @param int $n The new bitfield.
	 * @param int $o The old bitfield.
	 * @return array An array as described above.
	 * @since 1.19 public
	 */
	public static function getChanges( $n, $o ) {
		$diff = $n ^ $o;
		$ret = array( 0 => array(), 1 => array(), 2 => array() );
		// Build bitfield changes in language
		self::checkItem( 'revdelete-content',
			Revision::DELETED_TEXT, $diff, $n, $ret );
		self::checkItem( 'revdelete-summary',
			Revision::DELETED_COMMENT, $diff, $n, $ret );
		self::checkItem( 'revdelete-uname',
			Revision::DELETED_USER, $diff, $n, $ret );
		// Restriction application to sysops
		if ( $diff & Revision::DELETED_RESTRICTED ) {
			if ( $n & Revision::DELETED_RESTRICTED ) {
				$ret[2][] = 'revdelete-restricted';
			} else {
				$ret[2][] = 'revdelete-unrestricted';
			}
		}
		return $ret;
	}

	/** Get DB field name for URL param...
	 * Future code for other things may also track
	 * other types of revision-specific changes.
	 * @param string $typeName
	 * @return string One of log_id/rev_id/fa_id/ar_timestamp/oi_archive_name
	 */
	public static function getRelationType( $typeName ) {
		$typeName = self::getCanonicalTypeName( $typeName );
		if ( !$typeName ) {
			return null;
		}
		return call_user_func( array( self::$allowedTypes[$typeName], 'getRelationType' ) );
	}

	/**
	 * Get the user right required for the RevDel type
	 * @since 1.22
	 * @param string $typeName
	 * @return string User right
	 */
	public static function getRestriction( $typeName ) {
		$typeName = self::getCanonicalTypeName( $typeName );
		if ( !$typeName ) {
			return null;
		}
		return call_user_func( array( self::$allowedTypes[$typeName], 'getRestriction' ) );
	}

	/**
	 * Get the revision deletion constant for the RevDel type
	 * @since 1.22
	 * @param string $typeName
	 * @return int RevDel constant
	 */
	public static function getRevdelConstant( $typeName ) {
		$typeName = self::getCanonicalTypeName( $typeName );
		if ( !$typeName ) {
			return null;
		}
		return call_user_func( array( self::$allowedTypes[$typeName], 'getRevdelConstant' ) );
	}

	/**
	 * Suggest a target for the revision deletion
	 * @since 1.22
	 * @param string $typeName
	 * @param Title|null $target User-supplied target
	 * @param array $ids
	 * @return Title|null
	 */
	public static function suggestTarget( $typeName, $target, array $ids ) {
		$typeName = self::getCanonicalTypeName( $typeName );
		if ( !$typeName ) {
			return $target;
		}
		return call_user_func( array( self::$allowedTypes[$typeName], 'suggestTarget' ), $target, $ids );
	}

	/**
	 * Checks if a revision still exists in the revision table.
	 * If it doesn't, returns the corresponding ar_timestamp field
	 * so that this key can be used instead.
	 *
	 * @param Title $title
	 * @param int $revid
	 * @return bool|mixed
	 */
	public static function checkRevisionExistence( $title, $revid ) {
		$dbr = wfGetDB( DB_SLAVE );
		$exists = $dbr->selectField( 'revision', '1',
				array( 'rev_id' => $revid ), __METHOD__ );

		if ( $exists ) {
			return true;
		}

		$timestamp = $dbr->selectField( 'archive', 'ar_timestamp',
				array( 'ar_namespace' => $title->getNamespace(),
					'ar_title' => $title->getDBkey(),
					'ar_rev_id' => $revid ), __METHOD__ );

		return $timestamp;
	}

	/**
	 * Put together a rev_deleted bitfield
	 * @since 1.22
	 * @param array $bitPars ExtractBitParams() params
	 * @param int $oldfield Current bitfield
	 * @return integer
	 */
	public static function extractBitfield( array $bitPars, $oldfield ) {
		// Build the actual new rev_deleted bitfield
		$newBits = 0;
		foreach ( $bitPars as $const => $val ) {
			if ( $val == 1 ) {
				$newBits |= $const; // $const is the *_deleted const
			} elseif ( $val == -1 ) {
				$newBits |= ( $oldfield & $const ); // use existing
			}
		}
		return $newBits;
	}
}