Special:Upload should not crash on failing previews

[mediawiki.git] / includes / specials / SpecialBlock.php

<?php
/**
 * Implements Special:Block
 *
 * 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
 *
 * @file
 * @ingroup SpecialPage
 */

/**
 * A special page that allows users with 'block' right to block users from
 * editing pages and other actions
 *
 * @ingroup SpecialPage
 */
class SpecialBlock extends FormSpecialPage {
        /** @var User|string|null User to be blocked, as passed either by parameter (url?wpTarget=Foo)
         * or as subpage (Special:Block/Foo) */
        protected $target;

        /** @var int Block::TYPE_ constant */
        protected $type;

        /** @var User|string The previous block target */
        protected $previousTarget;

        /** @var bool Whether the previous submission of the form asked for HideUser */
        protected $requestedHideUser;

        /** @var bool */
        protected $alreadyBlocked;

        /** @var array */
        protected $preErrors = [];

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

        public function doesWrites() {
                return true;
        }

        /**
         * Checks that the user can unblock themselves if they are trying to do so
         *
         * @param User $user
         * @throws ErrorPageError
         */
        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 );
                }
        }

        /**
         * Handle some magic here
         *
         * @param string $par
         */
        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' );
        }

        /**
         * Customizes the HTMLForm a bit
         *
         * @param HTMLForm $form
         */
        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
                                ) );
                        }
                }
        }

        /**
         * Get the HTMLForm descriptor array for the block form
         * @return array
         */
        protected function getFormFields() {
                global $wgBlockAllowsUTEdit;
                if ( !wfMessage( 'ipbreason-dropdown' )->inContentLanguage()->isDisabled() ) {
                        $reasonsList = Xml::getArrayFromWikiTextList(
                                wfMessage( 'ipbreason-dropdown' )->inContentLanguage()->text()
                        );
                        $this->getOutput()->addModules( 'mediawiki.reasonSuggest' );
                        $this->getOutput()->addJsConfigVars( [
                                'reasons' => $reasonsList
                        ] );
                }
                $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;
        }

        /**
         * If the user has already been blocked with similar settings, load that block
         * and change the defaults for the form fields to match the existing settings.
         * @param array $fields HTMLForm descriptor array
         * @return bool Whether fields were altered (that is, whether the target is
         *     already blocked)
         */
        protected function maybeAlterFormDefaults( &$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' ];
                }
        }

        /**
         * Add header elements like block log entries, etc.
         * @return string
         */
        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 ) {
                        $targetName = $this->target;
                        if ( $this->target instanceof User ) {
                                $targetName = $this->target->getName();
                        }
                        # Get other blocks, i.e. from GlobalBlocking or TorBlock extension
                        Hooks::run( 'OtherBlockLogLink', [ &$otherBlockMessages, $targetName ] );

                        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;
        }

        /**
         * Add footer elements to the form
         * @return string
         */
        protected function postText() {
                $links = [];

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

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

                # 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[] = $linkRenderer->makeKnownLink(
                        $list,
                        new HtmlArmor( $message )
                );

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

                $user = $this->getUser();

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

        /**
         * Get a user page target for things like logs.
         * This handles account and IP range targets.
         * @param User|string $target
         * @return Title|null
         */
        protected static function getTargetUserTitle( $target ) {
                if ( $target instanceof User ) {
                        return $target->getUserPage();
                } elseif ( IP::isIPAddress( $target ) ) {
                        return Title::makeTitleSafe( NS_USER, $target );
                }

                return null;
        }

        /**
         * Determine the target of the block, and the type of target
         * @todo Should be in Block.php?
         * @param string $par Subpage parameter passed to setup, or data value from
         *     the HTMLForm
         * @param WebRequest $request Optionally try and get data from a request too
         * @return array( User|string|null, Block::TYPE_ constant|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 ];
        }

        /**
         * HTMLForm field validation-callback for Target field.
         * @since 1.18
         * @param string $value
         * @param array $alldata
         * @param HTMLForm $form
         * @return Message
         */
        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;
                }
        }

        /**
         * Validate a block target.
         *
         * @since 1.21
         * @param string $value Block target to check
         * @param User $user Performer of the block
         * @return Status
         */
        public static function validateTarget( $value, User $user ) {
                global $wgBlockCIDRLimit;

                /** @var User $target */
                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;
        }

        /**
         * Given the form data, actually implement a block. This is also called from ApiBlock.
         *
         * @param array $data
         * @param IContextSource $context
         * @return bool|string
         */
        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 );

                /** @var User $target */
                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 ) {
                        $user = null;
                        $userId = 0;
                } elseif ( $type == Block::TYPE_IP ) {
                        $user = null;
                        $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;
                }

                $priorBlock = null;
                # 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' ];
                                }

                                $priorBlock = clone $currentBlock;
                                $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, $priorBlock ] );

                # 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();

                if ( count( $data['Tags'] ) ) {
                        $logEntry->setTags( $data['Tags'] );
                }

                $logEntry->publish( $logId );

                return true;
        }

        /**
         * Get an array of suggested block durations from MediaWiki:Ipboptions
         * @todo FIXME: This uses a rather odd syntax for the options, should it be converted
         *     to the standard "**<duration>|<displayname>" format?
         * @param Language|null $lang The language to get the durations in, or null to use
         *     the wiki's content language
         * @return array
         */
        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;
        }

        /**
         * Convert a submitted expiry time, which may be relative ("2 weeks", etc) or absolute
         * ("24 May 2034", etc), into an absolute timestamp we can put into the database.
         * @param string $expiry Whatever was typed into the form
         * @return string Timestamp or 'infinity'
         */
        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;
        }

        /**
         * Can we do an email block?
         * @param User $user The sysop wanting to make a block
         * @return bool
         */
        public static function canBlockEmail( $user ) {
                global $wgEnableUserEmail, $wgSysopEmailBans;

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

        /**
         * bug 15810: blocked admins should not be able to block/unblock
         * others, and probably shouldn't be able to unblock themselves
         * either.
         * @param User|int|string $user
         * @param User $performer User doing the request
         * @return bool|string True or error message key
         */
        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;
                }
        }

        /**
         * Return a comma-delimited list of "flags" to be passed to the log
         * reader for this block, to provide more information in the logs
         * @param array $data From HTMLForm data
         * @param int $type Block::TYPE_ constant (USER, RANGE, or IP)
         * @return string
         */
        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 );
        }

        /**
         * Process the form on POST submission.
         * @param array $data
         * @param HTMLForm $form
         * @return bool|array True for success, false for didn't-try, array of errors on failure
         */
        public function onSubmit( array $data, HTMLForm $form = null ) {
                return self::processForm( $data, $form->getContext() );
        }

        /**
         * Do something exciting on successful processing of the form, most likely to show a
         * confirmation message
         */
        public function onSuccess() {
                $out = $this->getOutput();
                $out->setPageTitle( $this->msg( 'blockipsuccesssub' ) );
                $out->addWikiMsg( 'blockipsuccesstext', wfEscapeWikiText( $this->target ) );
        }

        /**
         * Return an array of subpages beginning with $search that this special page will accept.
         *
         * @param string $search Prefix to search for
         * @param int $limit Maximum number of results to return (usually 10)
         * @param int $offset Number of results to skip (usually 0)
         * @return string[] Matching subpages
         */
        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';
        }
}