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GlobalBlockingGlobalAutoblockExemptionListProvider.php
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GlobalBlockingGlobalAutoblockExemptionListProvider.php
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<?php
namespace MediaWiki\Extension\GlobalBlocking\Services;
use MediaWiki\Config\ServiceOptions;
use MediaWiki\Http\HttpRequestFactory;
use MediaWiki\Json\FormatJson;
use MediaWiki\Site\MediaWikiSite;
use MediaWiki\Site\SiteLookup;
use MediaWiki\Status\StatusFormatter;
use MediaWiki\Title\Title;
use Psr\Log\LoggerInterface;
use RuntimeException;
use Wikimedia\IPUtils;
use Wikimedia\LightweightObjectStore\ExpirationAwareness;
use Wikimedia\Message\ITextFormatter;
use Wikimedia\Message\MessageValue;
use Wikimedia\ObjectCache\WANObjectCache;
/**
* Provides access to the list of IP addresses which are exempt from global autoblocks.
*
* @since 1.43
*/
class GlobalBlockingGlobalAutoblockExemptionListProvider {
private const CACHE_VERSION = 0;
public const CONSTRUCTOR_OPTIONS = [
'GlobalBlockingCentralWiki',
];
private ServiceOptions $options;
private ITextFormatter $textFormatter;
private WANObjectCache $wanObjectCache;
private HttpRequestFactory $httpRequestFactory;
private SiteLookup $siteLookup;
private StatusFormatter $statusFormatter;
private LoggerInterface $logger;
public function __construct(
ServiceOptions $options,
ITextFormatter $textFormatter,
WANObjectCache $wanObjectCache,
HttpRequestFactory $httpRequestFactory,
SiteLookup $siteLookup,
StatusFormatter $statusFormatter,
LoggerInterface $logger
) {
$options->assertRequiredOptions( self::CONSTRUCTOR_OPTIONS );
$this->options = $options;
$this->textFormatter = $textFormatter;
$this->wanObjectCache = $wanObjectCache;
$this->httpRequestFactory = $httpRequestFactory;
$this->siteLookup = $siteLookup;
$this->statusFormatter = $statusFormatter;
$this->logger = $logger;
}
/**
* Checks whether a given IP is on the global autoblock exemption list
*
* @param string $ip The IP to check
* @return bool
*/
public function isExempt( string $ip ): bool {
foreach ( $this->getExemptIPAddresses() as $ipOrRangeToCheck ) {
if ( IPUtils::isInRange( $ip, $ipOrRangeToCheck ) ) {
return true;
}
}
return false;
}
/**
* Gets the list of IP addresses that are exempt from global autoblocks.
*
* The result of this method is cached to improve performance. Call ::clearCache to clear the cache if the
* exempt list has been recently edited and needs a refresh.
*
* @return array
*/
public function getExemptIPAddresses(): array {
$exemptIPsAndRanges = $this->wanObjectCache->getWithSetCallback(
$this->getCacheKey(),
ExpirationAwareness::TTL_HOUR,
function () {
return $this->fetchExemptIPAddresses();
},
[ 'version' => self::CACHE_VERSION, 'pcTTL' => ExpirationAwareness::TTL_PROC_SHORT ]
);
// If we failed to get the list of exempt IP addresses, then try using the local message.
// This isn't ideal, but is probably better than throwing an exception.
// Because the cached value is false, the next call to this method will try to fetch the
// IP addresses again from ::fetchExemptIPAddresses.
if ( $exemptIPsAndRanges === false ) {
return $this->parseIPAddressList( $this->textFormatter->format(
MessageValue::new( 'globalblocking-globalautoblock-exemptionlist' )
) );
}
return $exemptIPsAndRanges;
}
/**
* Clears the cache of IP addresses exempt from global autoblocks.
*
* @return void
*/
public function clearCache() {
$this->wanObjectCache->delete( $this->getCacheKey() );
}
private function getCacheKey(): string {
return $this->wanObjectCache->makeGlobalKey(
'GlobalBlocking',
'GlobalAutoBlockExemptList',
$this->options->get( 'GlobalBlockingCentralWiki' )
);
}
/**
* Get the URL used to get the content of the global autoblock exempt list on the central wiki.
*
* @return string|false
*/
private function getForeignAPIQueryUrl() {
$centralWiki = $this->options->get( 'GlobalBlockingCentralWiki' );
if ( !$centralWiki ) {
return false;
}
$site = $this->siteLookup->getSite( $centralWiki );
if ( !( $site instanceof MediaWikiSite ) ) {
return false;
}
$exemptList = Title::makeName( NS_MEDIAWIKI, 'globalblocking-globalautoblock-exemptionlist', '', '', true );
return wfAppendQuery(
$site->getFileUrl( 'api.php' ),
[
'action' => 'query', 'prop' => 'revisions', 'rvslots' => 'main', 'rvprop' => 'content',
'formatversion' => 2, 'format' => 'json', 'titles' => $exemptList, 'rvlimit' => 1,
]
);
}
/**
* Parse the globalblocking-globalautoblock-exemptionlist message into an array of exempt IP addresses
* and/or ranges.
*
* @return array
*/
private function parseIPAddressList( string $exemptionList ): array {
$ips = [];
$exemptionListLines = explode( "\n", $exemptionList );
foreach ( $exemptionListLines as $line ) {
// Only lines which begin with '*' are considered valid.
if ( !str_starts_with( $line, '*' ) ) {
continue;
}
$ips[] = trim( substr( $line, 1 ) );
}
return $ips;
}
/**
* Fetches an uncached list of IP addresses and/or ranges that are exempt from global autoblocks.
*
* @return array|false Array of IP addresses and/or ranges, or false on failure.
*/
private function fetchExemptIPAddresses() {
// Attempt to get a URL for the central wiki, and if we can't get this URL then fallback to the exempt list on
// the local wiki.
$centralWikiUrl = $this->getForeignAPIQueryUrl();
if ( !$centralWikiUrl ) {
return $this->parseIPAddressList( $this->textFormatter->format(
MessageValue::new( 'globalblocking-globalautoblock-exemptionlist' )
) );
}
$req = $this->httpRequestFactory->create(
$centralWikiUrl,
[ 'userAgent' => $this->httpRequestFactory->getUserAgent() . ' GlobalAutoblockExemptionListProvider' ],
__METHOD__
);
$status = $req->execute();
[ $errorStatus, $warningStatus ] = $status->splitByErrorType();
if ( !$warningStatus->isGood() ) {
[ $errorText, $context ] = $this->statusFormatter->getPsr3MessageAndContext( $warningStatus );
$this->logger->warning(
$errorText,
array_merge( $context, [ 'exception' => new RuntimeException() ] )
);
}
if ( $errorStatus->isGood() ) {
$json = $req->getContent();
$decoded = FormatJson::decode( $json, true );
if ( is_array( $decoded ) ) {
$exemptListPage = $decoded['query']['pages'][0] ?? null;
if ( $exemptListPage !== null ) {
// Parse the content in the most recent revision. If there are no revisions, then the message
// is empty which means that there are no IP addresses exempt from global autoblocks.
$exemptListContent = $exemptListPage['revisions'][0]['slots']['main']['content'] ?? '';
return $this->parseIPAddressList( $exemptListContent );
}
}
}
// If we could not fetch the exempt list from the central wiki, then return false so that a new attempt
// to fetch the IPs is made the next time this method is called.
[ $errorText, $context ] = $this->statusFormatter->getPsr3MessageAndContext( $errorStatus );
$this->logger->error( $errorText, array_merge( [ 'exception' => new RuntimeException() ], $context ) );
return false;
}
}

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GlobalBlockingGlobalAutoblockExemptionListProvider.php (6 KB)

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