UserNameUtils.php

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<?php
 
namespace MediaWiki\User;
 
use InvalidArgumentException;
use Language;
use MediaWiki\Config\ServiceOptions;
use MediaWiki\HookContainer\HookContainer;
use MediaWiki\HookContainer\HookRunner;
use MediaWiki\MainConfigNames;
use MediaWiki\Title\MalformedTitleException;
use MediaWiki\Title\TitleParser;
use MediaWiki\User\TempUser\TempUserConfig;
use Psr\Log\LoggerInterface;
use Wikimedia\IPUtils;
use Wikimedia\Message\ITextFormatter;
use Wikimedia\Message\MessageValue;
 
class UserNameUtils implements UserRigorOptions {
 
    public const CONSTRUCTOR_OPTIONS = [
        MainConfigNames::MaxNameChars,
        MainConfigNames::ReservedUsernames,
        MainConfigNames::InvalidUsernameCharacters
    ];
 
    private ServiceOptions $options;
    private Language $contentLang;
    private LoggerInterface $logger;
    private TitleParser $titleParser;
    private ITextFormatter $textFormatter;
 
    private $reservedUsernames = false;
 
    private HookRunner $hookRunner;
    private TempUserConfig $tempUserConfig;
 
    public function __construct(
        ServiceOptions $options,
        Language $contentLang,
        LoggerInterface $logger,
        TitleParser $titleParser,
        ITextFormatter $textFormatter,
        HookContainer $hookContainer,
        TempUserConfig $tempUserConfig
    ) {
        $options->assertRequiredOptions( self::CONSTRUCTOR_OPTIONS );
        $this->options = $options;
        $this->contentLang = $contentLang;
        $this->logger = $logger;
        $this->titleParser = $titleParser;
        $this->textFormatter = $textFormatter;
        $this->hookRunner = new HookRunner( $hookContainer );
        $this->tempUserConfig = $tempUserConfig;
    }
 
    public function isValid( string $name ): bool {
        if ( $name === ''
            || $this->isIP( $name )
            || str_contains( $name, '/' )
            || strlen( $name ) > $this->options->get( MainConfigNames::MaxNameChars )
            || $name !== $this->contentLang->ucfirst( $name )
        ) {
            return false;
        }
 
        // Ensure that the name can't be misresolved as a different title,
        // such as with extra namespace keys at the start.
        try {
            $title = $this->titleParser->parseTitle( $name );
        } catch ( MalformedTitleException $_ ) {
            $title = null;
        }
 
        if ( $title === null
            || $title->getNamespace()
            || strcmp( $name, $title->getText() )
        ) {
            return false;
        }
 
        // Check an additional list of troublemaker characters.
        // Should these be merged into the title char list?
        $unicodeList = '/[' .
            '\x{0080}-\x{009f}' . # iso-8859-1 control chars
            '\x{00a0}' . # non-breaking space
            '\x{2000}-\x{200f}' . # various whitespace
            '\x{2028}-\x{202f}' . # breaks and control chars
            '\x{3000}' . # ideographic space
            '\x{e000}-\x{f8ff}' . # private use
            ']/u';
        if ( preg_match( $unicodeList, $name ) ) {
            return false;
        }
 
        return true;
    }
 
    public function isUsable( string $name ): bool {
        // Must be a valid username, obviously ;)
        if ( !$this->isValid( $name ) ) {
            return false;
        }
 
        if ( !$this->reservedUsernames ) {
            $reservedUsernames = $this->options->get( MainConfigNames::ReservedUsernames );
            $this->hookRunner->onUserGetReservedNames( $reservedUsernames );
            foreach ( $reservedUsernames as &$reserved ) {
                if ( str_starts_with( $reserved, 'msg:' ) ) {
                    $reserved = $this->textFormatter->format(
                        MessageValue::new( substr( $reserved, 4 ) )
                    );
                }
            }
            $this->reservedUsernames = $reservedUsernames;
        }
 
        // Certain names may be reserved for batch processes.
        if ( in_array( $name, $this->reservedUsernames, true ) ) {
            return false;
        }
 
        // Check if the name is reserved by the temp user system (actual temp
        // users are allowed). This is necessary to ensure that CentralAuth
        // auto-creation will be denied (T342475).
        if ( $this->isTempReserved( $name ) && !$this->isTemp( $name ) ) {
            return false;
        }
 
        return true;
    }
 
    public function isCreatable( string $name ): bool {
        // Ensure that the username isn't longer than 235 bytes, so that
        // (at least for the builtin skins) user javascript and css files
        // will work. (T25080)
        if ( strlen( $name ) > 235 ) {
            $this->logger->debug(
                __METHOD__ . ": '$name' uncreatable due to length"
            );
            return false;
        }
 
        $invalid = $this->options->get( MainConfigNames::InvalidUsernameCharacters );
        // Preg yells if you try to give it an empty string
        if ( $invalid !== '' &&
            preg_match( '/[' . preg_quote( $invalid, '/' ) . ']/', $name )
        ) {
            $this->logger->debug(
                __METHOD__ . ": '$name' uncreatable due to wgInvalidUsernameCharacters"
            );
            return false;
        }
 
        if ( $this->isTempReserved( $name ) ) {
            $this->logger->debug(
                __METHOD__ . ": '$name' uncreatable due to TempUserConfig"
            );
            return false;
        }
 
        return $this->isUsable( $name );
    }
 
    public function getCanonical( string $name, string $validate = self::RIGOR_VALID ) {
        // Force usernames to capital
        $name = $this->contentLang->ucfirst( $name );
 
        // Reject names containing '#'; these will be cleaned up
        // with title normalisation, but then it's too late to
        // check elsewhere
        if ( strpos( $name, '#' ) !== false ) {
            return false;
        }
 
        // No need to proceed if no validation is requested, just
        // clean up underscores and user namespace prefix (see T283915).
        if ( $validate === self::RIGOR_NONE ) {
            // This is only needed here because if validation is
            // not self::RIGOR_NONE, it would be done at title parsing stage.
            $nsPrefix = $this->contentLang->getNsText( NS_USER ) . ':';
            if ( str_starts_with( $name, $nsPrefix ) ) {
                $name = str_replace( $nsPrefix, '', $name );
            }
            $name = strtr( $name, '_', ' ' );
            return $name;
        }
 
        // Clean up name according to title rules,
        // but only when validation is requested (T14654)
        try {
            $title = $this->titleParser->parseTitle( $name, NS_USER );
        } catch ( MalformedTitleException $_ ) {
            $title = null;
        }
 
        // Check for invalid titles
        if ( $title === null
            || $title->getNamespace() !== NS_USER
            || $title->isExternal()
        ) {
            return false;
        }
 
        $name = $title->getText();
 
        // RIGOR_NONE handled above
        switch ( $validate ) {
            case self::RIGOR_VALID:
                return $this->isValid( $name ) ? $name : false;
            case self::RIGOR_USABLE:
                return $this->isUsable( $name ) ? $name : false;
            case self::RIGOR_CREATABLE:
                return $this->isCreatable( $name ) ? $name : false;
            default:
                throw new InvalidArgumentException(
                    "Invalid parameter value for validation ($validate) in " .
                    __METHOD__
                );
        }
    }
 
    public function isIP( string $name ): bool {
        $anyIPv4 = '/^\d{1,3}\.\d{1,3}\.\d{1,3}\.(?:xxx|\d{1,3})$/';
        $validIP = IPUtils::isValid( $name );
        return $validIP || preg_match( $anyIPv4, $name );
    }
 
    public function isValidIPRange( string $range ): bool {
        return IPUtils::isValidRange( $range );
    }
 
    public function isTemp( string $name ) {
        return $this->tempUserConfig->isTempName( $name );
    }
 
    public function isTempReserved( string $name ) {
        return $this->tempUserConfig->isReservedName( $name );
    }
 
    public function getTempPlaceholder() {
        return $this->tempUserConfig->getPlaceholderName();
    }
}