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<?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 = [
'revision' => 'RevDelRevisionList',
'archive' => 'RevDelArchiveList',
'oldimage' => 'RevDelFileList',
'filearchive' => 'RevDelArchivedFileList',
'logging' => 'RevDelLogList',
];
/** Type map to support old log entries */
private static $deprecatedTypeMap = [
'oldid' => 'revision',
'artimestamp' => 'archive',
'oldimage' => 'oldimage',
'fileid' => 'filearchive',
'logid' => 'logging',
];
/**
* Lists the valid possible types for revision deletion.
*
* @since 1.22
* @return array
*/
public static function getTypes() {
return array_keys( self::$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'" );
}
$class = self::$allowedTypes[$typeName];
return new $class( $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 = [ 0 => [], 1 => [], 2 => [] ];
// 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( [ 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( [ 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( [ 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 $target;
}
return call_user_func( [ self::$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',
[ 'rev_id' => $revid ], __METHOD__ );
if ( $exists ) {
return true;
}
$timestamp = $dbr->selectField( 'archive', 'ar_timestamp',
[ '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;
}
}