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<?php
/**
* A class to check request restrictions expressed as a JSON object
*
* 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
*/
/**
* A class to check request restrictions expressed as a JSON object
*/
class MWRestrictions {
private $ipAddresses = [ '0.0.0.0/0', '::/0' ];
/**
* @param array $restrictions
* @throws InvalidArgumentException
*/
protected function __construct( array $restrictions = null ) {
if ( $restrictions !== null ) {
$this->loadFromArray( $restrictions );
}
}
/**
* @return MWRestrictions
*/
public static function newDefault() {
return new self();
}
/**
* @param array $restrictions
* @return MWRestrictions
* @throws InvalidArgumentException
*/
public static function newFromArray( array $restrictions ) {
return new self( $restrictions );
}
/**
* @param string $json JSON representation of the restrictions
* @return MWRestrictions
* @throws InvalidArgumentException
*/
public static function newFromJson( $json ) {
$restrictions = FormatJson::decode( $json, true );
if ( !is_array( $restrictions ) ) {
throw new InvalidArgumentException( 'Invalid restrictions JSON' );
}
return new self( $restrictions );
}
private function loadFromArray( array $restrictions ) {
static $validKeys = [ 'IPAddresses' ];
static $neededKeys = [ 'IPAddresses' ];
$keys = array_keys( $restrictions );
$invalidKeys = array_diff( $keys, $validKeys );
if ( $invalidKeys ) {
throw new InvalidArgumentException(
'Array contains invalid keys: ' . implode( ', ', $invalidKeys )
);
}
$missingKeys = array_diff( $neededKeys, $keys );
if ( $missingKeys ) {
throw new InvalidArgumentException(
'Array is missing required keys: ' . implode( ', ', $missingKeys )
);
}
if ( !is_array( $restrictions['IPAddresses'] ) ) {
throw new InvalidArgumentException( 'IPAddresses is not an array' );
}
foreach ( $restrictions['IPAddresses'] as $ip ) {
if ( !\IP::isIPAddress( $ip ) ) {
throw new InvalidArgumentException( "Invalid IP address: $ip" );
}
}
$this->ipAddresses = $restrictions['IPAddresses'];
}
/**
* Return the restrictions as an array
* @return array
*/
public function toArray() {
return [
'IPAddresses' => $this->ipAddresses,
];
}
/**
* Return the restrictions as a JSON string
* @param bool|string $pretty Pretty-print the JSON output, see FormatJson::encode
* @return string
*/
public function toJson( $pretty = false ) {
return FormatJson::encode( $this->toArray(), $pretty, FormatJson::ALL_OK );
}
public function __toString() {
return $this->toJson();
}
/**
* Test against the passed WebRequest
* @param WebRequest $request
* @return Status
*/
public function check( WebRequest $request ) {
$ok = [
'ip' => $this->checkIP( $request->getIP() ),
];
$status = Status::newGood();
$status->setResult( $ok === array_filter( $ok ), $ok );
return $status;
}
/**
* Test an IP address
* @param string $ip
* @return bool
*/
public function checkIP( $ip ) {
foreach ( $this->ipAddresses as $range ) {
if ( \IP::isInRange( $ip, $range ) ) {
return true;
}
}
return false;
}
}
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