includes/utils/MWRestrictions.php

   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 /**
  22  * A class to check request restrictions expressed as a JSON object
  23  */
  24 class MWRestrictions {
  25
  26         private $ipAddresses = array( '0.0.0.0/0', '::/0' );
  27
  28         /**
  29          * @param array $restrictions
  30          */
  31         protected function __construct( array $restrictions = null ) {
  32                 if ( $restrictions !== null ) {
  33                         $this->loadFromArray( $restrictions );
  34                 }
  35         }
  36
  37         /**
  38          * @return MWRestrictions
  39          */
  40         public static function newDefault() {
  41                 return new self();
  42         }
  43
  44         /**
  45          * @param array $restrictions
  46          * @return MWRestrictions
  47          */
  48         public static function newFromArray( array $restrictions ) {
  49                 return new self( $restrictions );
  50         }
  51
  52         /**
  53          * @param string $json JSON representation of the restrictions
  54          * @return MWRestrictions
  55          */
  56         public static function newFromJson( $json ) {
  57                 $restrictions = FormatJson::decode( $json, true );
  58                 if ( !is_array( $restrictions ) ) {
  59                         throw new InvalidArgumentException( 'Invalid restrictions JSON' );
  60                 }
  61                 return new self( $restrictions );
  62         }
  63
  64         private function loadFromArray( array $restrictions ) {
  65                 static $validKeys = array( 'IPAddresses' );
  66                 static $neededKeys = array( 'IPAddresses' );
  67
  68                 $keys = array_keys( $restrictions );
  69                 $invalidKeys = array_diff( $keys, $validKeys );
  70                 if ( $invalidKeys ) {
  71                         throw new InvalidArgumentException(
  72                                 'Array contains invalid keys: ' . join( ', ', $invalidKeys )
  73                         );
  74                 }
  75                 $missingKeys = array_diff( $neededKeys, $keys );
  76                 if ( $missingKeys ) {
  77                         throw new InvalidArgumentException(
  78                                 'Array is missing required keys: ' . join( ', ', $missingKeys )
  79                         );
  80                 }
  81
  82                 if ( !is_array( $restrictions['IPAddresses'] ) ) {
  83                         throw new InvalidArgumentException( 'IPAddresses is not an array' );
  84                 }
  85                 foreach ( $restrictions['IPAddresses'] as $ip ) {
  86                         if ( !\IP::isIPAddress( $ip ) ) {
  87                                 throw new InvalidArgumentException( "Invalid IP address: $ip" );
  88                         }
  89                 }
  90                 $this->ipAddresses = $restrictions['IPAddresses'];
  91         }
  92
  93         /**
  94          * Return the restrictions as an array
  95          * @return array
  96          */
  97         public function toArray() {
  98                 return array(
  99                         'IPAddresses' => $this->ipAddresses,
 100                 );
 101         }
 102
 103         /**
 104          * Return the restrictions as a JSON string
 105          * @param bool|string $pretty Pretty-print the JSON output, see FormatJson::encode
 106          * @return string
 107          */
 108         public function toJson( $pretty = false ) {
 109                 return FormatJson::encode( $this->toArray(), $pretty, FormatJson::ALL_OK );
 110         }
 111
 112         public function __toString() {
 113                 return $this->toJson();
 114         }
 115
 116         /**
 117          * Test against the passed WebRequest
 118          * @param WebRequest $request
 119          * @return Status
 120          */
 121         public function check( WebRequest $request ) {
 122                 $ok = array(
 123                         'ip' => $this->checkIP( $request->getIP() ),
 124                 );
 125                 $status = Status::newGood();
 126                 $status->setResult( $ok === array_filter( $ok ), $ok );
 127                 return $status;
 128         }
 129
 130         /**
 131          * Test an IP address
 132          * @param string $ip
 133          * @return bool
 134          */
 135         public function checkIP( $ip ) {
 136                 foreach ( $this->ipAddresses as $range ) {
 137                         if ( \IP::isInRange( $ip, $range ) ) {
 138                                 return true;
 139                         }
 140                 }
 141
 142                 return false;
 143         }
 144 }