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| 1 | <?php |
| 2 | /** |
| 3 | * A class to check request restrictions expressed as a JSON object |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License as published by |
| 7 | * the Free Software Foundation; either version 2 of the License, or |
| 8 | * (at your option) any later version. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License along |
| 16 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 17 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
| 18 | * http://www.gnu.org/copyleft/gpl.html |
| 19 | */ |
| 20 | |
| 21 | use MediaWiki\Linker\LinkTarget; |
| 22 | use MediaWiki\Request\WebRequest; |
| 23 | use MediaWiki\Status\Status; |
| 24 | use Wikimedia\IPSet; |
| 25 | use Wikimedia\IPUtils; |
| 26 | |
| 27 | /** |
| 28 | * A class to check request restrictions expressed as a JSON object |
| 29 | */ |
| 30 | class MWRestrictions { |
| 31 | |
| 32 | private $ipAddresses = [ '0.0.0.0/0', '::/0' ]; |
| 33 | |
| 34 | private $pages = []; |
| 35 | |
| 36 | public StatusValue $validity; |
| 37 | |
| 38 | /** |
| 39 | * @param array|null $restrictions |
| 40 | * @throws InvalidArgumentException |
| 41 | */ |
| 42 | protected function __construct( array $restrictions = null ) { |
| 43 | $this->validity = StatusValue::newGood(); |
| 44 | if ( $restrictions !== null ) { |
| 45 | $this->loadFromArray( $restrictions ); |
| 46 | } |
| 47 | } |
| 48 | |
| 49 | /** |
| 50 | * @return MWRestrictions |
| 51 | */ |
| 52 | public static function newDefault() { |
| 53 | return new self(); |
| 54 | } |
| 55 | |
| 56 | /** |
| 57 | * @param array $restrictions |
| 58 | * @return MWRestrictions |
| 59 | * @throws InvalidArgumentException |
| 60 | */ |
| 61 | public static function newFromArray( array $restrictions ) { |
| 62 | return new self( $restrictions ); |
| 63 | } |
| 64 | |
| 65 | /** |
| 66 | * @param string $json JSON representation of the restrictions |
| 67 | * @return MWRestrictions |
| 68 | * @throws InvalidArgumentException |
| 69 | */ |
| 70 | public static function newFromJson( $json ) { |
| 71 | $restrictions = FormatJson::decode( $json, true ); |
| 72 | if ( !is_array( $restrictions ) ) { |
| 73 | throw new InvalidArgumentException( 'Invalid restrictions JSON' ); |
| 74 | } |
| 75 | return new self( $restrictions ); |
| 76 | } |
| 77 | |
| 78 | private function loadFromArray( array $restrictions ) { |
| 79 | static $neededKeys = [ 'IPAddresses' ]; |
| 80 | |
| 81 | $keys = array_keys( $restrictions ); |
| 82 | $missingKeys = array_diff( $neededKeys, $keys ); |
| 83 | if ( $missingKeys ) { |
| 84 | throw new InvalidArgumentException( |
| 85 | 'Array is missing required keys: ' . implode( ', ', $missingKeys ) |
| 86 | ); |
| 87 | } |
| 88 | |
| 89 | if ( !is_array( $restrictions['IPAddresses'] ) ) { |
| 90 | throw new InvalidArgumentException( 'IPAddresses is not an array' ); |
| 91 | } |
| 92 | foreach ( $restrictions['IPAddresses'] as $ip ) { |
| 93 | if ( !IPUtils::isIPAddress( $ip ) ) { |
| 94 | $this->validity->fatal( 'restrictionsfield-badip', $ip ); |
| 95 | } |
| 96 | } |
| 97 | $this->ipAddresses = $restrictions['IPAddresses']; |
| 98 | |
| 99 | if ( isset( $restrictions['Pages'] ) ) { |
| 100 | if ( !is_array( $restrictions['Pages'] ) ) { |
| 101 | throw new InvalidArgumentException( 'Pages is not an array of page names' ); |
| 102 | } |
| 103 | foreach ( $restrictions['Pages'] as $page ) { |
| 104 | if ( !is_string( $page ) ) { |
| 105 | throw new InvalidArgumentException( "Pages contains non-string value: $page" ); |
| 106 | } |
| 107 | } |
| 108 | $this->pages = $restrictions['Pages']; |
| 109 | } |
| 110 | } |
| 111 | |
| 112 | /** |
| 113 | * Return the restrictions as an array |
| 114 | * @return array |
| 115 | */ |
| 116 | public function toArray() { |
| 117 | $arr = [ 'IPAddresses' => $this->ipAddresses ]; |
| 118 | if ( count( $this->pages ) ) { |
| 119 | $arr['Pages'] = $this->pages; |
| 120 | } |
| 121 | return $arr; |
| 122 | } |
| 123 | |
| 124 | /** |
| 125 | * Return the restrictions as a JSON string |
| 126 | * @param bool|string $pretty Pretty-print the JSON output, see FormatJson::encode |
| 127 | * @return string |
| 128 | */ |
| 129 | public function toJson( $pretty = false ) { |
| 130 | return FormatJson::encode( $this->toArray(), $pretty, FormatJson::ALL_OK ); |
| 131 | } |
| 132 | |
| 133 | public function __toString() { |
| 134 | return $this->toJson(); |
| 135 | } |
| 136 | |
| 137 | /** |
| 138 | * Test against the passed WebRequest |
| 139 | * @param WebRequest $request |
| 140 | * @return Status |
| 141 | */ |
| 142 | public function check( WebRequest $request ) { |
| 143 | $ok = [ |
| 144 | 'ip' => $this->checkIP( $request->getIP() ), |
| 145 | ]; |
| 146 | $status = Status::newGood(); |
| 147 | $status->setResult( $ok === array_filter( $ok ), $ok ); |
| 148 | return $status; |
| 149 | } |
| 150 | |
| 151 | /** |
| 152 | * Test whether an action on the target is allowed by the restrictions |
| 153 | * |
| 154 | * @internal |
| 155 | * @param LinkTarget $target |
| 156 | * @return StatusValue |
| 157 | */ |
| 158 | public function userCan( LinkTarget $target ) { |
| 159 | if ( !$this->checkPage( $target ) ) { |
| 160 | return StatusValue::newFatal( 'session-page-restricted' ); |
| 161 | } |
| 162 | return StatusValue::newGood(); |
| 163 | } |
| 164 | |
| 165 | /** |
| 166 | * Test if an IP address is allowed by the restrictions |
| 167 | * @param string $ip |
| 168 | * @return bool |
| 169 | */ |
| 170 | public function checkIP( $ip ) { |
| 171 | $set = new IPSet( $this->ipAddresses ); |
| 172 | return $set->match( $ip ); |
| 173 | } |
| 174 | |
| 175 | /** |
| 176 | * Test if an action on a title is allowed by the restrictions |
| 177 | * |
| 178 | * @param LinkTarget $target |
| 179 | * @return bool |
| 180 | */ |
| 181 | private function checkPage( LinkTarget $target ) { |
| 182 | if ( count( $this->pages ) === 0 ) { |
| 183 | return true; |
| 184 | } |
| 185 | $pagesNormalized = array_map( static function ( $titleText ) { |
| 186 | $title = Title::newFromText( $titleText ); |
| 187 | return $title ? $title->getPrefixedText() : ''; |
| 188 | }, $this->pages ); |
| 189 | return in_array( Title::newFromLinkTarget( $target )->getPrefixedText(), $pagesNormalized, true ); |
| 190 | } |
| 191 | } |