SpecialBlock.php

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<?php
class SpecialBlock extends FormSpecialPage {
    protected $target;

    protected $type;

    protected $previousTarget;

    protected $requestedHideUser;

    protected $alreadyBlocked;

    protected $preErrors = [];

    public function __construct() {
        parent::__construct( 'Block', 'block' );
    }

    public function doesWrites() {
        return true;
    }

    protected function checkExecutePermissions( User $user ) {
        parent::checkExecutePermissions( $user );

        # bug 15810: blocked admins should have limited access here
        $status = self::checkUnblockSelf( $this->target, $user );
        if ( $status !== true ) {
            throw new ErrorPageError( 'badaccess', $status );
        }
    }

    protected function setParameter( $par ) {
        # Extract variables from the request.  Try not to get into a situation where we
        # need to extract *every* variable from the form just for processing here, but
        # there are legitimate uses for some variables
        $request = $this->getRequest();
        list( $this->target, $this->type ) = self::getTargetAndType( $par, $request );
        if ( $this->target instanceof User ) {
            # Set the 'relevant user' in the skin, so it displays links like Contributions,
            # User logs, UserRights, etc.
            $this->getSkin()->setRelevantUser( $this->target );
        }

        list( $this->previousTarget, /*...*/ ) =
            Block::parseTarget( $request->getVal( 'wpPreviousTarget' ) );
        $this->requestedHideUser = $request->getBool( 'wpHideUser' );
    }

    protected function alterForm( HTMLForm $form ) {
        $form->setWrapperLegendMsg( 'blockip-legend' );
        $form->setHeaderText( '' );
        $form->setSubmitDestructive();

        $msg = $this->alreadyBlocked ? 'ipb-change-block' : 'ipbsubmit';
        $form->setSubmitTextMsg( $msg );

        $this->addHelpLink( 'Help:Blocking users' );

        # Don't need to do anything if the form has been posted
        if ( !$this->getRequest()->wasPosted() && $this->preErrors ) {
            $s = $form->formatErrors( $this->preErrors );
            if ( $s ) {
                $form->addHeaderText( Html::rawElement(
                    'div',
                    [ 'class' => 'error' ],
                    $s
                ) );
            }
        }
    }

    protected function getFormFields() {
        global $wgBlockAllowsUTEdit;

        $user = $this->getUser();

        $suggestedDurations = self::getSuggestedDurations();

        $a = [
            'Target' => [
                'type' => 'text',
                'label-message' => 'ipaddressorusername',
                'id' => 'mw-bi-target',
                'size' => '45',
                'autofocus' => true,
                'required' => true,
                'validation-callback' => [ __CLASS__, 'validateTargetField' ],
                'cssclass' => 'mw-autocomplete-user', // used by mediawiki.userSuggest
            ],
            'Expiry' => [
                'type' => !count( $suggestedDurations ) ? 'text' : 'selectorother',
                'label-message' => 'ipbexpiry',
                'required' => true,
                'options' => $suggestedDurations,
                'other' => $this->msg( 'ipbother' )->text(),
                'default' => $this->msg( 'ipb-default-expiry' )->inContentLanguage()->text(),
            ],
            'Reason' => [
                'type' => 'selectandother',
                'maxlength' => 255,
                'label-message' => 'ipbreason',
                'options-message' => 'ipbreason-dropdown',
            ],
            'CreateAccount' => [
                'type' => 'check',
                'label-message' => 'ipbcreateaccount',
                'default' => true,
            ],
        ];

        if ( self::canBlockEmail( $user ) ) {
            $a['DisableEmail'] = [
                'type' => 'check',
                'label-message' => 'ipbemailban',
            ];
        }

        if ( $wgBlockAllowsUTEdit ) {
            $a['DisableUTEdit'] = [
                'type' => 'check',
                'label-message' => 'ipb-disableusertalk',
                'default' => false,
            ];
        }

        $a['AutoBlock'] = [
            'type' => 'check',
            'label-message' => 'ipbenableautoblock',
            'default' => true,
        ];

        # Allow some users to hide name from block log, blocklist and listusers
        if ( $user->isAllowed( 'hideuser' ) ) {
            $a['HideUser'] = [
                'type' => 'check',
                'label-message' => 'ipbhidename',
                'cssclass' => 'mw-block-hideuser',
            ];
        }

        # Watchlist their user page? (Only if user is logged in)
        if ( $user->isLoggedIn() ) {
            $a['Watch'] = [
                'type' => 'check',
                'label-message' => 'ipbwatchuser',
            ];
        }

        $a['HardBlock'] = [
            'type' => 'check',
            'label-message' => 'ipb-hardblock',
            'default' => false,
        ];

        # This is basically a copy of the Target field, but the user can't change it, so we
        # can see if the warnings we maybe showed to the user before still apply
        $a['PreviousTarget'] = [
            'type' => 'hidden',
            'default' => false,
        ];

        # We'll turn this into a checkbox if we need to
        $a['Confirm'] = [
            'type' => 'hidden',
            'default' => '',
            'label-message' => 'ipb-confirm',
        ];

        $this->maybeAlterFormDefaults( $a );

        // Allow extensions to add more fields
        Hooks::run( 'SpecialBlockModifyFormFields', [ $this, &$a ] );

        return $a;
    }

    protected function maybeAlterFormDefaults( &$fields ) {
        # This will be overwritten by request data
        $fields['Target']['default'] = (string)$this->target;

        if ( $this->target ) {
            $status = self::validateTarget( $this->target, $this->getUser() );
            if ( !$status->isOK() ) {
                $errors = $status->getErrorsArray();
                $this->preErrors = array_merge( $this->preErrors, $errors );
            }
        }

        # This won't be
        $fields['PreviousTarget']['default'] = (string)$this->target;

        $block = Block::newFromTarget( $this->target );

        if ( $block instanceof Block && !$block->mAuto # The block exists and isn't an autoblock
            && ( $this->type != Block::TYPE_RANGE # The block isn't a rangeblock
                || $block->getTarget() == $this->target ) # or if it is, the range is what we're about to block
        ) {
            $fields['HardBlock']['default'] = $block->isHardblock();
            $fields['CreateAccount']['default'] = $block->prevents( 'createaccount' );
            $fields['AutoBlock']['default'] = $block->isAutoblocking();

            if ( isset( $fields['DisableEmail'] ) ) {
                $fields['DisableEmail']['default'] = $block->prevents( 'sendemail' );
            }

            if ( isset( $fields['HideUser'] ) ) {
                $fields['HideUser']['default'] = $block->mHideName;
            }

            if ( isset( $fields['DisableUTEdit'] ) ) {
                $fields['DisableUTEdit']['default'] = $block->prevents( 'editownusertalk' );
            }

            // If the username was hidden (ipb_deleted == 1), don't show the reason
            // unless this user also has rights to hideuser: Bug 35839
            if ( !$block->mHideName || $this->getUser()->isAllowed( 'hideuser' ) ) {
                $fields['Reason']['default'] = $block->mReason;
            } else {
                $fields['Reason']['default'] = '';
            }

            if ( $this->getRequest()->wasPosted() ) {
                # Ok, so we got a POST submission asking us to reblock a user.  So show the
                # confirm checkbox; the user will only see it if they haven't previously
                $fields['Confirm']['type'] = 'check';
            } else {
                # We got a target, but it wasn't a POST request, so the user must have gone
                # to a link like [[Special:Block/User]].  We don't need to show the checkbox
                # as long as they go ahead and block *that* user
                $fields['Confirm']['default'] = 1;
            }

            if ( $block->mExpiry == 'infinity' ) {
                $fields['Expiry']['default'] = 'infinite';
            } else {
                $fields['Expiry']['default'] = wfTimestamp( TS_RFC2822, $block->mExpiry );
            }

            $this->alreadyBlocked = true;
            $this->preErrors[] = [ 'ipb-needreblock', wfEscapeWikiText( (string)$block->getTarget() ) ];
        }

        # We always need confirmation to do HideUser
        if ( $this->requestedHideUser ) {
            $fields['Confirm']['type'] = 'check';
            unset( $fields['Confirm']['default'] );
            $this->preErrors[] = [ 'ipb-confirmhideuser', 'ipb-confirmaction' ];
        }

        # Or if the user is trying to block themselves
        if ( (string)$this->target === $this->getUser()->getName() ) {
            $fields['Confirm']['type'] = 'check';
            unset( $fields['Confirm']['default'] );
            $this->preErrors[] = [ 'ipb-blockingself', 'ipb-confirmaction' ];
        }
    }

    protected function preText() {
        $this->getOutput()->addModules( [ 'mediawiki.special.block', 'mediawiki.userSuggest' ] );

        $blockCIDRLimit = $this->getConfig()->get( 'BlockCIDRLimit' );
        $text = $this->msg( 'blockiptext', $blockCIDRLimit['IPv4'], $blockCIDRLimit['IPv6'] )->parse();

        $otherBlockMessages = [];
        if ( $this->target !== null ) {
            # Get other blocks, i.e. from GlobalBlocking or TorBlock extension
            Hooks::run( 'OtherBlockLogLink', [ &$otherBlockMessages, $this->target ] );

            if ( count( $otherBlockMessages ) ) {
                $s = Html::rawElement(
                    'h2',
                    [],
                    $this->msg( 'ipb-otherblocks-header', count( $otherBlockMessages ) )->parse()
                ) . "\n";

                $list = '';

                foreach ( $otherBlockMessages as $link ) {
                    $list .= Html::rawElement( 'li', [], $link ) . "\n";
                }

                $s .= Html::rawElement(
                    'ul',
                    [ 'class' => 'mw-blockip-alreadyblocked' ],
                    $list
                ) . "\n";

                $text .= $s;
            }
        }

        return $text;
    }

    protected function postText() {
        $links = [];

        $this->getOutput()->addModuleStyles( 'mediawiki.special' );

        # Link to the user's contributions, if applicable
        if ( $this->target instanceof User ) {
            $contribsPage = SpecialPage::getTitleFor( 'Contributions', $this->target->getName() );
            $links[] = Linker::link(
                $contribsPage,
                $this->msg( 'ipb-blocklist-contribs', $this->target->getName() )->escaped()
            );
        }

        # Link to unblock the specified user, or to a blank unblock form
        if ( $this->target instanceof User ) {
            $message = $this->msg(
                'ipb-unblock-addr',
                wfEscapeWikiText( $this->target->getName() )
            )->parse();
            $list = SpecialPage::getTitleFor( 'Unblock', $this->target->getName() );
        } else {
            $message = $this->msg( 'ipb-unblock' )->parse();
            $list = SpecialPage::getTitleFor( 'Unblock' );
        }
        $links[] = Linker::linkKnown( $list, $message, [] );

        # Link to the block list
        $links[] = Linker::linkKnown(
            SpecialPage::getTitleFor( 'BlockList' ),
            $this->msg( 'ipb-blocklist' )->escaped()
        );

        $user = $this->getUser();

        # Link to edit the block dropdown reasons, if applicable
        if ( $user->isAllowed( 'editinterface' ) ) {
            $links[] = Linker::linkKnown(
                $this->msg( 'ipbreason-dropdown' )->inContentLanguage()->getTitle(),
                $this->msg( 'ipb-edit-dropdown' )->escaped(),
                [],
                [ 'action' => 'edit' ]
            );
        }

        $text = Html::rawElement(
            'p',
            [ 'class' => 'mw-ipb-conveniencelinks' ],
            $this->getLanguage()->pipeList( $links )
        );

        $userTitle = self::getTargetUserTitle( $this->target );
        if ( $userTitle ) {
            # Get relevant extracts from the block and suppression logs, if possible
            $out = '';

            LogEventsList::showLogExtract(
                $out,
                'block',
                $userTitle,
                '',
                [
                    'lim' => 10,
                    'msgKey' => [ 'blocklog-showlog', $userTitle->getText() ],
                    'showIfEmpty' => false
                ]
            );
            $text .= $out;

            # Add suppression block entries if allowed
            if ( $user->isAllowed( 'suppressionlog' ) ) {
                LogEventsList::showLogExtract(
                    $out,
                    'suppress',
                    $userTitle,
                    '',
                    [
                        'lim' => 10,
                        'conds' => [ 'log_action' => [ 'block', 'reblock', 'unblock' ] ],
                        'msgKey' => [ 'blocklog-showsuppresslog', $userTitle->getText() ],
                        'showIfEmpty' => false
                    ]
                );

                $text .= $out;
            }
        }

        return $text;
    }

    protected static function getTargetUserTitle( $target ) {
        if ( $target instanceof User ) {
            return $target->getUserPage();
        } elseif ( IP::isIPAddress( $target ) ) {
            return Title::makeTitleSafe( NS_USER, $target );
        }

        return null;
    }

    public static function getTargetAndType( $par, WebRequest $request = null ) {
        $i = 0;
        $target = null;

        while ( true ) {
            switch ( $i++ ) {
                case 0:
                    # The HTMLForm will check wpTarget first and only if it doesn't get
                    # a value use the default, which will be generated from the options
                    # below; so this has to have a higher precedence here than $par, or
                    # we could end up with different values in $this->target and the HTMLForm!
                    if ( $request instanceof WebRequest ) {
                        $target = $request->getText( 'wpTarget', null );
                    }
                    break;
                case 1:
                    $target = $par;
                    break;
                case 2:
                    if ( $request instanceof WebRequest ) {
                        $target = $request->getText( 'ip', null );
                    }
                    break;
                case 3:
                    # B/C @since 1.18
                    if ( $request instanceof WebRequest ) {
                        $target = $request->getText( 'wpBlockAddress', null );
                    }
                    break;
                case 4:
                    break 2;
            }

            list( $target, $type ) = Block::parseTarget( $target );

            if ( $type !== null ) {
                return [ $target, $type ];
            }
        }

        return [ null, null ];
    }

    public static function validateTargetField( $value, $alldata, $form ) {
        $status = self::validateTarget( $value, $form->getUser() );
        if ( !$status->isOK() ) {
            $errors = $status->getErrorsArray();

            return call_user_func_array( [ $form, 'msg' ], $errors[0] );
        } else {
            return true;
        }
    }

    public static function validateTarget( $value, User $user ) {
        global $wgBlockCIDRLimit;

        list( $target, $type ) = self::getTargetAndType( $value );
        $status = Status::newGood( $target );

        if ( $type == Block::TYPE_USER ) {
            if ( $target->isAnon() ) {
                $status->fatal(
                    'nosuchusershort',
                    wfEscapeWikiText( $target->getName() )
                );
            }

            $unblockStatus = self::checkUnblockSelf( $target, $user );
            if ( $unblockStatus !== true ) {
                $status->fatal( 'badaccess', $unblockStatus );
            }
        } elseif ( $type == Block::TYPE_RANGE ) {
            list( $ip, $range ) = explode( '/', $target, 2 );

            if (
                ( IP::isIPv4( $ip ) && $wgBlockCIDRLimit['IPv4'] == 32 ) ||
                ( IP::isIPv6( $ip ) && $wgBlockCIDRLimit['IPv6'] == 128 )
            ) {
                // Range block effectively disabled
                $status->fatal( 'range_block_disabled' );
            }

            if (
                ( IP::isIPv4( $ip ) && $range > 32 ) ||
                ( IP::isIPv6( $ip ) && $range > 128 )
            ) {
                // Dodgy range
                $status->fatal( 'ip_range_invalid' );
            }

            if ( IP::isIPv4( $ip ) && $range < $wgBlockCIDRLimit['IPv4'] ) {
                $status->fatal( 'ip_range_toolarge', $wgBlockCIDRLimit['IPv4'] );
            }

            if ( IP::isIPv6( $ip ) && $range < $wgBlockCIDRLimit['IPv6'] ) {
                $status->fatal( 'ip_range_toolarge', $wgBlockCIDRLimit['IPv6'] );
            }
        } elseif ( $type == Block::TYPE_IP ) {
            # All is well
        } else {
            $status->fatal( 'badipaddress' );
        }

        return $status;
    }

    public static function processForm( array $data, IContextSource $context ) {
        global $wgBlockAllowsUTEdit, $wgHideUserContribLimit, $wgContLang;

        $performer = $context->getUser();

        // Handled by field validator callback
        // self::validateTargetField( $data['Target'] );

        # This might have been a hidden field or a checkbox, so interesting data
        # can come from it
        $data['Confirm'] = !in_array( $data['Confirm'], [ '', '0', null, false ], true );

        list( $target, $type ) = self::getTargetAndType( $data['Target'] );
        if ( $type == Block::TYPE_USER ) {
            $user = $target;
            $target = $user->getName();
            $userId = $user->getId();

            # Give admins a heads-up before they go and block themselves.  Much messier
            # to do this for IPs, but it's pretty unlikely they'd ever get the 'block'
            # permission anyway, although the code does allow for it.
            # Note: Important to use $target instead of $data['Target']
            # since both $data['PreviousTarget'] and $target are normalized
            # but $data['target'] gets overridden by (non-normalized) request variable
            # from previous request.
            if ( $target === $performer->getName() &&
                ( $data['PreviousTarget'] !== $target || !$data['Confirm'] )
            ) {
                return [ 'ipb-blockingself', 'ipb-confirmaction' ];
            }
        } elseif ( $type == Block::TYPE_RANGE ) {
            $userId = 0;
        } elseif ( $type == Block::TYPE_IP ) {
            $target = $target->getName();
            $userId = 0;
        } else {
            # This should have been caught in the form field validation
            return [ 'badipaddress' ];
        }

        $expiryTime = self::parseExpiryInput( $data['Expiry'] );

        if (
            // an expiry time is needed
            ( strlen( $data['Expiry'] ) == 0 ) ||
            // can't be a larger string as 50 (it should be a time format in any way)
            ( strlen( $data['Expiry'] ) > 50 ) ||
            // check, if the time could be parsed
            !$expiryTime
        ) {
            return [ 'ipb_expiry_invalid' ];
        }

        // an expiry time should be in the future, not in the
        // past (wouldn't make any sense) - bug T123069
        if ( $expiryTime < wfTimestampNow() ) {
            return [ 'ipb_expiry_old' ];
        }

        if ( !isset( $data['DisableEmail'] ) ) {
            $data['DisableEmail'] = false;
        }

        # If the user has done the form 'properly', they won't even have been given the
        # option to suppress-block unless they have the 'hideuser' permission
        if ( !isset( $data['HideUser'] ) ) {
            $data['HideUser'] = false;
        }

        if ( $data['HideUser'] ) {
            if ( !$performer->isAllowed( 'hideuser' ) ) {
                # this codepath is unreachable except by a malicious user spoofing forms,
                # or by race conditions (user has hideuser and block rights, loads block form,
                # and loses hideuser rights before submission); so need to fail completely
                # rather than just silently disable hiding
                return [ 'badaccess-group0' ];
            }

            # Recheck params here...
            if ( $type != Block::TYPE_USER ) {
                $data['HideUser'] = false; # IP users should not be hidden
            } elseif ( !wfIsInfinity( $data['Expiry'] ) ) {
                # Bad expiry.
                return [ 'ipb_expiry_temp' ];
            } elseif ( $wgHideUserContribLimit !== false
                && $user->getEditCount() > $wgHideUserContribLimit
            ) {
                # Typically, the user should have a handful of edits.
                # Disallow hiding users with many edits for performance.
                return [ [ 'ipb_hide_invalid',
                    Message::numParam( $wgHideUserContribLimit ) ] ];
            } elseif ( !$data['Confirm'] ) {
                return [ 'ipb-confirmhideuser', 'ipb-confirmaction' ];
            }
        }

        # Create block object.
        $block = new Block();
        $block->setTarget( $target );
        $block->setBlocker( $performer );
        # Truncate reason for whole multibyte characters
        $block->mReason = $wgContLang->truncate( $data['Reason'][0], 255 );
        $block->mExpiry = $expiryTime;
        $block->prevents( 'createaccount', $data['CreateAccount'] );
        $block->prevents( 'editownusertalk', ( !$wgBlockAllowsUTEdit || $data['DisableUTEdit'] ) );
        $block->prevents( 'sendemail', $data['DisableEmail'] );
        $block->isHardblock( $data['HardBlock'] );
        $block->isAutoblocking( $data['AutoBlock'] );
        $block->mHideName = $data['HideUser'];

        $reason = [ 'hookaborted' ];
        if ( !Hooks::run( 'BlockIp', [ &$block, &$performer, &$reason ] ) ) {
            return $reason;
        }

        # Try to insert block. Is there a conflicting block?
        $status = $block->insert();
        if ( !$status ) {
            # Indicates whether the user is confirming the block and is aware of
            # the conflict (did not change the block target in the meantime)
            $blockNotConfirmed = !$data['Confirm'] || ( array_key_exists( 'PreviousTarget', $data )
                && $data['PreviousTarget'] !== $target );

            # Special case for API - bug 32434
            $reblockNotAllowed = ( array_key_exists( 'Reblock', $data ) && !$data['Reblock'] );

            # Show form unless the user is already aware of this...
            if ( $blockNotConfirmed || $reblockNotAllowed ) {
                return [ [ 'ipb_already_blocked', $block->getTarget() ] ];
                # Otherwise, try to update the block...
            } else {
                # This returns direct blocks before autoblocks/rangeblocks, since we should
                # be sure the user is blocked by now it should work for our purposes
                $currentBlock = Block::newFromTarget( $target );

                if ( $block->equals( $currentBlock ) ) {
                    return [ [ 'ipb_already_blocked', $block->getTarget() ] ];
                }

                # If the name was hidden and the blocking user cannot hide
                # names, then don't allow any block changes...
                if ( $currentBlock->mHideName && !$performer->isAllowed( 'hideuser' ) ) {
                    return [ 'cant-see-hidden-user' ];
                }

                $currentBlock->isHardblock( $block->isHardblock() );
                $currentBlock->prevents( 'createaccount', $block->prevents( 'createaccount' ) );
                $currentBlock->mExpiry = $block->mExpiry;
                $currentBlock->isAutoblocking( $block->isAutoblocking() );
                $currentBlock->mHideName = $block->mHideName;
                $currentBlock->prevents( 'sendemail', $block->prevents( 'sendemail' ) );
                $currentBlock->prevents( 'editownusertalk', $block->prevents( 'editownusertalk' ) );
                $currentBlock->mReason = $block->mReason;

                $status = $currentBlock->update();

                $logaction = 'reblock';

                # Unset _deleted fields if requested
                if ( $currentBlock->mHideName && !$data['HideUser'] ) {
                    RevisionDeleteUser::unsuppressUserName( $target, $userId );
                }

                # If hiding/unhiding a name, this should go in the private logs
                if ( (bool)$currentBlock->mHideName ) {
                    $data['HideUser'] = true;
                }
            }
        } else {
            $logaction = 'block';
        }

        Hooks::run( 'BlockIpComplete', [ $block, $performer ] );

        # Set *_deleted fields if requested
        if ( $data['HideUser'] ) {
            RevisionDeleteUser::suppressUserName( $target, $userId );
        }

        # Can't watch a rangeblock
        if ( $type != Block::TYPE_RANGE && $data['Watch'] ) {
            WatchAction::doWatch(
                Title::makeTitle( NS_USER, $target ),
                $performer,
                User::IGNORE_USER_RIGHTS
            );
        }

        # Block constructor sanitizes certain block options on insert
        $data['BlockEmail'] = $block->prevents( 'sendemail' );
        $data['AutoBlock'] = $block->isAutoblocking();

        # Prepare log parameters
        $logParams = [];
        $logParams['5::duration'] = $data['Expiry'];
        $logParams['6::flags'] = self::blockLogFlags( $data, $type );

        # Make log entry, if the name is hidden, put it in the suppression log
        $log_type = $data['HideUser'] ? 'suppress' : 'block';
        $logEntry = new ManualLogEntry( $log_type, $logaction );
        $logEntry->setTarget( Title::makeTitle( NS_USER, $target ) );
        $logEntry->setComment( $data['Reason'][0] );
        $logEntry->setPerformer( $performer );
        $logEntry->setParameters( $logParams );
        # Relate log ID to block IDs (bug 25763)
        $blockIds = array_merge( [ $status['id'] ], $status['autoIds'] );
        $logEntry->setRelations( [ 'ipb_id' => $blockIds ] );
        $logId = $logEntry->insert();
        $logEntry->publish( $logId );

        # Report to the user
        return true;
    }

    public static function getSuggestedDurations( $lang = null ) {
        $a = [];
        $msg = $lang === null
            ? wfMessage( 'ipboptions' )->inContentLanguage()->text()
            : wfMessage( 'ipboptions' )->inLanguage( $lang )->text();

        if ( $msg == '-' ) {
            return [];
        }

        foreach ( explode( ',', $msg ) as $option ) {
            if ( strpos( $option, ':' ) === false ) {
                $option = "$option:$option";
            }

            list( $show, $value ) = explode( ':', $option );
            $a[$show] = $value;
        }

        return $a;
    }

    public static function parseExpiryInput( $expiry ) {
        if ( wfIsInfinity( $expiry ) ) {
            $expiry = 'infinity';
        } else {
            $expiry = strtotime( $expiry );

            if ( $expiry < 0 || $expiry === false ) {
                return false;
            }

            $expiry = wfTimestamp( TS_MW, $expiry );
        }

        return $expiry;
    }

    public static function canBlockEmail( $user ) {
        global $wgEnableUserEmail, $wgSysopEmailBans;

        return ( $wgEnableUserEmail && $wgSysopEmailBans && $user->isAllowed( 'blockemail' ) );
    }

    public static function checkUnblockSelf( $user, User $performer ) {
        if ( is_int( $user ) ) {
            $user = User::newFromId( $user );
        } elseif ( is_string( $user ) ) {
            $user = User::newFromName( $user );
        }

        if ( $performer->isBlocked() ) {
            if ( $user instanceof User && $user->getId() == $performer->getId() ) {
                # User is trying to unblock themselves
                if ( $performer->isAllowed( 'unblockself' ) ) {
                    return true;
                    # User blocked themselves and is now trying to reverse it
                } elseif ( $performer->blockedBy() === $performer->getName() ) {
                    return true;
                } else {
                    return 'ipbnounblockself';
                }
            } else {
                # User is trying to block/unblock someone else
                return 'ipbblocked';
            }
        } else {
            return true;
        }
    }

    protected static function blockLogFlags( array $data, $type ) {
        global $wgBlockAllowsUTEdit;
        $flags = [];

        # when blocking a user the option 'anononly' is not available/has no effect
        # -> do not write this into log
        if ( !$data['HardBlock'] && $type != Block::TYPE_USER ) {
            // For grepping: message block-log-flags-anononly
            $flags[] = 'anononly';
        }

        if ( $data['CreateAccount'] ) {
            // For grepping: message block-log-flags-nocreate
            $flags[] = 'nocreate';
        }

        # Same as anononly, this is not displayed when blocking an IP address
        if ( !$data['AutoBlock'] && $type == Block::TYPE_USER ) {
            // For grepping: message block-log-flags-noautoblock
            $flags[] = 'noautoblock';
        }

        if ( $data['DisableEmail'] ) {
            // For grepping: message block-log-flags-noemail
            $flags[] = 'noemail';
        }

        if ( $wgBlockAllowsUTEdit && $data['DisableUTEdit'] ) {
            // For grepping: message block-log-flags-nousertalk
            $flags[] = 'nousertalk';
        }

        if ( $data['HideUser'] ) {
            // For grepping: message block-log-flags-hiddenname
            $flags[] = 'hiddenname';
        }

        return implode( ',', $flags );
    }

    public function onSubmit( array $data, HTMLForm $form = null ) {
        return self::processForm( $data, $form->getContext() );
    }

    public function onSuccess() {
        $out = $this->getOutput();
        $out->setPageTitle( $this->msg( 'blockipsuccesssub' ) );
        $out->addWikiMsg( 'blockipsuccesstext', wfEscapeWikiText( $this->target ) );
    }

    public function prefixSearchSubpages( $search, $limit, $offset ) {
        $user = User::newFromName( $search );
        if ( !$user ) {
            // No prefix suggestion for invalid user
            return [];
        }
        // Autocomplete subpage as user list - public to allow caching
        return UserNamePrefixSearch::search( 'public', $search, $limit, $offset );
    }

    protected function getGroupName() {
        return 'users';
    }
}