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| 1 | <?php |
| 2 | /** |
| 3 | * Efficient concatenated text storage. |
| 4 | * |
| 5 | * @license GPL-2.0-or-later |
| 6 | * @file |
| 7 | */ |
| 8 | |
| 9 | // NO_NAMESPACE Compatibility with serialized objects in permanent storage |
| 10 | |
| 11 | use MediaWiki\MediaWikiServices; |
| 12 | |
| 13 | /** |
| 14 | * Pointer object for an item within a CGZ blob stored in the text table. |
| 15 | * |
| 16 | * WARNING: Objects of this class are serialized and permanently stored in the DB. |
| 17 | * Do not change the name or visibility of any property! |
| 18 | * |
| 19 | * Note: the property visibility was changed in 2020 from public to protected. |
| 20 | * This may cause problems in future. |
| 21 | */ |
| 22 | class HistoryBlobStub { |
| 23 | /** |
| 24 | * @var array One-step cache variable to hold base blobs; operations that |
| 25 | * pull multiple revisions may often pull multiple times from the same |
| 26 | * blob. By keeping the last-used one open, we avoid redundant |
| 27 | * unserialization and decompression overhead. |
| 28 | */ |
| 29 | protected static $blobCache = []; |
| 30 | |
| 31 | /** @var int */ |
| 32 | protected $mOldId; |
| 33 | |
| 34 | /** @var string */ |
| 35 | protected $mHash; |
| 36 | |
| 37 | /** @var string */ |
| 38 | protected $mRef; |
| 39 | |
| 40 | /** |
| 41 | * @param string $hash The content hash of the text |
| 42 | * @param int $oldid The old_id for the CGZ object |
| 43 | */ |
| 44 | public function __construct( $hash = '', $oldid = 0 ) { |
| 45 | $this->mHash = $hash; |
| 46 | } |
| 47 | |
| 48 | /** |
| 49 | * Sets the location (old_id) of the main object to which this object |
| 50 | * points |
| 51 | * @param int $id |
| 52 | */ |
| 53 | public function setLocation( $id ) { |
| 54 | $this->mOldId = $id; |
| 55 | } |
| 56 | |
| 57 | /** |
| 58 | * Gets the location of the main object |
| 59 | * @return int |
| 60 | */ |
| 61 | public function getLocation() { |
| 62 | return $this->mOldId; |
| 63 | } |
| 64 | |
| 65 | /** |
| 66 | * Sets the location (old_id) of the referring object |
| 67 | * @param string $id |
| 68 | */ |
| 69 | public function setReferrer( $id ) { |
| 70 | $this->mRef = $id; |
| 71 | } |
| 72 | |
| 73 | /** |
| 74 | * Gets the location of the referring object |
| 75 | * @return string |
| 76 | */ |
| 77 | public function getReferrer() { |
| 78 | return $this->mRef; |
| 79 | } |
| 80 | |
| 81 | /** |
| 82 | * @return string|false |
| 83 | */ |
| 84 | public function getText() { |
| 85 | if ( isset( self::$blobCache[$this->mOldId] ) ) { |
| 86 | $obj = self::$blobCache[$this->mOldId]; |
| 87 | } else { |
| 88 | $dbr = MediaWikiServices::getInstance()->getConnectionProvider()->getReplicaDatabase(); |
| 89 | $row = $dbr->newSelectQueryBuilder() |
| 90 | ->select( [ 'old_flags', 'old_text' ] ) |
| 91 | ->from( 'text' ) |
| 92 | ->where( [ 'old_id' => $this->mOldId ] ) |
| 93 | ->caller( __METHOD__ )->fetchRow(); |
| 94 | |
| 95 | if ( !$row ) { |
| 96 | return false; |
| 97 | } |
| 98 | |
| 99 | $flags = explode( ',', $row->old_flags ); |
| 100 | if ( in_array( 'external', $flags ) ) { |
| 101 | $url = $row->old_text; |
| 102 | $parts = explode( '://', $url, 2 ); |
| 103 | if ( !isset( $parts[1] ) || $parts[1] == '' ) { |
| 104 | return false; |
| 105 | } |
| 106 | $row->old_text = MediaWikiServices::getInstance() |
| 107 | ->getExternalStoreAccess() |
| 108 | ->fetchFromURL( $url ); |
| 109 | } |
| 110 | |
| 111 | if ( !in_array( 'object', $flags ) ) { |
| 112 | return false; |
| 113 | } |
| 114 | |
| 115 | if ( in_array( 'gzip', $flags ) ) { |
| 116 | // This shouldn't happen, but a bug in the compress script |
| 117 | // may at times gzip-compress a HistoryBlob object row. |
| 118 | $obj = HistoryBlobUtils::unserialize( gzinflate( $row->old_text ), true ); |
| 119 | } else { |
| 120 | $obj = HistoryBlobUtils::unserialize( $row->old_text, true ); |
| 121 | } |
| 122 | |
| 123 | // Save this item for reference; if pulling many |
| 124 | // items in a row we'll likely use it again. |
| 125 | self::$blobCache = [ $this->mOldId => $obj ]; |
| 126 | } |
| 127 | |
| 128 | if ( method_exists( $obj, 'getItem' ) ) { |
| 129 | return $obj->getItem( $this->mHash ); |
| 130 | } |
| 131 | |
| 132 | return false; |
| 133 | } |
| 134 | |
| 135 | /** |
| 136 | * Get the content hash |
| 137 | * |
| 138 | * @return string |
| 139 | */ |
| 140 | public function getHash() { |
| 141 | return $this->mHash; |
| 142 | } |
| 143 | } |
| 144 | |
| 145 | // Blobs generated by MediaWiki < 1.5 on PHP 4 were serialized with the |
| 146 | // class name coerced to lowercase. We can improve efficiency by adding |
| 147 | // autoload entries for the lowercase variants of these classes (T166759). |
| 148 | // The code below is never executed, but it is picked up by the AutoloadGenerator |
| 149 | // parser, which scans for class_alias() calls. |
| 150 | /* |
| 151 | class_alias( HistoryBlobStub::class, 'historyblobstub' ); |
| 152 | */ |