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 Psr\Log\LoggerInterface;
use TitleFactory;
use Wikimedia\IPUtils;
use Wikimedia\Message\ITextFormatter;
use Wikimedia\Message\MessageValue;
 
class UserNameUtils {
 
    public const CONSTRUCTOR_OPTIONS = [
        'MaxNameChars',
        'ReservedUsernames',
        'InvalidUsernameCharacters'
    ];
 
    public const RIGOR_CREATABLE = 'creatable';
    public const RIGOR_USABLE = 'usable';
    public const RIGOR_VALID = 'valid';
    public const RIGOR_NONE = 'none';
 
    private $options;
 
    private $contentLang;
 
    private $logger;
 
    private $titleFactory;
 
    private $textFormatter;
 
    private $reservedUsernames = false;
 
    private $hookRunner;
 
    public function __construct(
        ServiceOptions $options,
        Language $contentLang,
        LoggerInterface $logger,
        TitleFactory $titleFactory,
        ITextFormatter $textFormatter,
        HookContainer $hookContainer
    ) {
        $options->assertRequiredOptions( self::CONSTRUCTOR_OPTIONS );
        $this->options = $options;
        $this->contentLang = $contentLang;
        $this->logger = $logger;
        $this->titleFactory = $titleFactory;
        $this->textFormatter = $textFormatter;
        $this->hookRunner = new HookRunner( $hookContainer );
    }
 
    public function isValid( string $name ) : bool {
        if ( $name === ''
            || $this->isIP( $name )
            || strpos( $name, '/' ) !== false
            || strlen( $name ) > $this->options->get( '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.
        $title = $this->titleFactory->newFromText( $name );
        if ( $title === null
            || $title->getNamespace()
            || strcmp( $name, $title->getPrefixedText() )
        ) {
            return false;
        }
 
        // Check an additional blacklist of troublemaker characters.
        // Should these be merged into the title char list?
        $unicodeBlacklist = '/[' .
            '\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( $unicodeBlacklist, $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( 'ReservedUsernames' );
            $this->hookRunner->onUserGetReservedNames( $reservedUsernames );
            $this->reservedUsernames = $reservedUsernames;
        }
 
        // Certain names may be reserved for batch processes.
        foreach ( $this->reservedUsernames as $reserved ) {
            if ( substr( $reserved, 0, 4 ) === 'msg:' ) {
                $reserved = $this->textFormatter->format(
                    MessageValue::new( substr( $reserved, 4 ) )
                );
            }
            if ( $reserved === $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( '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;
        }
 
        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 return
        if ( $validate === self::RIGOR_NONE ) {
            $name = strtr( $name, '_', ' ' );
            return $name;
        }
 
        // Clean up name according to title rules,
        // but only when validation is requested (T14654)
        $title = $this->titleFactory->newFromText( $name, NS_USER );
 
        // Check for invalid titles
        if ( $title === null
            || $title->getNamespace() !== NS_USER
            || $title->isExternal()
        ) {
            return false;
        }
 
        $name = $title->getText();
 
        // RIGOR_NONE handled above
        switch ( $validate ) {
            case self::RIGOR_VALID:
                if ( !$this->isValid( $name ) ) {
                    return false;
                }
                return $name;
            case self::RIGOR_USABLE:
                if ( !$this->isUsable( $name ) ) {
                    return false;
                }
                return $name;
            case self::RIGOR_CREATABLE:
                if ( !$this->isCreatable( $name ) ) {
                    return false;
                }
                return $name;
            default:
                throw new InvalidArgumentException(
                    "Invalid parameter value for validation ($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 );
    }
 
}