SpecialRedirect.php

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<?php
class SpecialRedirect extends FormSpecialPage {

    protected $mType;

    protected $mValue;

    function __construct() {
        parent::__construct( 'Redirect' );
        $this->mType = null;
        $this->mValue = null;
    }

    function setParameter( $subpage ) {
        // parse $subpage to pull out the parts
        $parts = explode( '/', $subpage, 2 );
        $this->mType = count( $parts ) > 0 ? $parts[0] : null;
        $this->mValue = count( $parts ) > 1 ? $parts[1] : null;
    }

    function dispatchUser() {
        if ( !ctype_digit( $this->mValue ) ) {
            // Message: redirect-not-numeric
            return Status::newFatal( $this->getMessagePrefix() . '-not-numeric' );
        }
        $user = User::newFromId( (int)$this->mValue );
        $username = $user->getName(); // load User as side-effect
        if ( $user->isAnon() ) {
            // Message: redirect-not-exists
            return Status::newFatal( $this->getMessagePrefix() . '-not-exists' );
        }
        $userpage = Title::makeTitle( NS_USER, $username );

        return Status::newGood( $userpage->getFullURL( '', false, PROTO_CURRENT ) );
    }

    function dispatchFile() {
        try {
            $title = Title::newFromTextThrow( $this->mValue, NS_FILE );
            if ( $title && !$title->inNamespace( NS_FILE ) ) {
                // If the given value contains a namespace enforce file namespace
                $title = Title::newFromTextThrow( Title::makeName( NS_FILE, $this->mValue ) );
            }
        } catch ( MalformedTitleException $e ) {
            return Status::newFatal( $e->getMessageObject() );
        }
        $file = wfFindFile( $title );

        if ( !$file || !$file->exists() ) {
            // Message: redirect-not-exists
            return Status::newFatal( $this->getMessagePrefix() . '-not-exists' );
        }
        // Default behavior: Use the direct link to the file.
        $url = $file->getUrl();
        $request = $this->getRequest();
        $width = $request->getInt( 'width', -1 );
        $height = $request->getInt( 'height', -1 );

        // If a width is requested...
        if ( $width != -1 ) {
            $mto = $file->transform( [ 'width' => $width, 'height' => $height ] );
            // ... and we can
            if ( $mto && !$mto->isError() ) {
                // ... change the URL to point to a thumbnail.
                // Note: This url is more temporary as can change
                // if file is reuploaded and has different aspect ratio.
                $url = [ $mto->getUrl(), $height === -1 ? 301 : 302 ];
            }
        }

        return Status::newGood( $url );
    }

    function dispatchRevision() {
        $oldid = $this->mValue;
        if ( !ctype_digit( $oldid ) ) {
            // Message: redirect-not-numeric
            return Status::newFatal( $this->getMessagePrefix() . '-not-numeric' );
        }
        $oldid = (int)$oldid;
        if ( $oldid === 0 ) {
            // Message: redirect-not-exists
            return Status::newFatal( $this->getMessagePrefix() . '-not-exists' );
        }

        return Status::newGood( wfAppendQuery( wfScript( 'index' ), [
            'oldid' => $oldid
        ] ) );
    }

    function dispatchPage() {
        $curid = $this->mValue;
        if ( !ctype_digit( $curid ) ) {
            // Message: redirect-not-numeric
            return Status::newFatal( $this->getMessagePrefix() . '-not-numeric' );
        }
        $curid = (int)$curid;
        if ( $curid === 0 ) {
            // Message: redirect-not-exists
            return Status::newFatal( $this->getMessagePrefix() . '-not-exists' );
        }

        return Status::newGood( wfAppendQuery( wfScript( 'index' ), [
            'curid' => $curid
        ] ) );
    }

    function dispatchLog() {
        $logid = $this->mValue;
        if ( !ctype_digit( $logid ) ) {
            // Message: redirect-not-numeric
            return Status::newFatal( $this->getMessagePrefix() . '-not-numeric' );
        }
        $logid = (int)$logid;
        if ( $logid === 0 ) {
            // Message: redirect-not-exists
            return Status::newFatal( $this->getMessagePrefix() . '-not-exists' );
        }
        $query = [ 'title' => 'Special:Log', 'logid' => $logid ];
        return Status::newGood( wfAppendQuery( wfScript( 'index' ), $query ) );
    }

    function dispatch() {
        // the various namespaces supported by Special:Redirect
        switch ( $this->mType ) {
            case 'user':
                $status = $this->dispatchUser();
                break;
            case 'file':
                $status = $this->dispatchFile();
                break;
            case 'revision':
                $status = $this->dispatchRevision();
                break;
            case 'page':
                $status = $this->dispatchPage();
                break;
            case 'logid':
                $status = $this->dispatchLog();
                break;
            default:
                $status = null;
                break;
        }
        if ( $status && $status->isGood() ) {
            // These urls can sometimes be linked from prominent places,
            // so varnish cache.
            $value = $status->getValue();
            if ( is_array( $value ) ) {
                list( $url, $code ) = $value;
            } else {
                $url = $value;
                $code = 301;
            }
            if ( $code === 301 ) {
                $this->getOutput()->setCdnMaxage( 60 * 60 );
            } else {
                $this->getOutput()->setCdnMaxage( 10 );
            }
            $this->getOutput()->redirect( $url, $code );

            return true;
        }
        if ( !is_null( $this->mValue ) ) {
            $this->getOutput()->setStatusCode( 404 );

            return $status;
        }

        return false;
    }

    protected function getFormFields() {
        $mp = $this->getMessagePrefix();
        $ns = [
            // subpage => message
            // Messages: redirect-user, redirect-page, redirect-revision,
            // redirect-file, redirect-logid
            'user' => $mp . '-user',
            'page' => $mp . '-page',
            'revision' => $mp . '-revision',
            'file' => $mp . '-file',
            'logid' => $mp . '-logid',
        ];
        $a = [];
        $a['type'] = [
            'type' => 'select',
            'label-message' => $mp . '-lookup', // Message: redirect-lookup
            'options' => [],
            'default' => current( array_keys( $ns ) ),
        ];
        foreach ( $ns as $n => $m ) {
            $m = $this->msg( $m )->text();
            $a['type']['options'][$m] = $n;
        }
        $a['value'] = [
            'type' => 'text',
            'label-message' => $mp . '-value' // Message: redirect-value
        ];
        // set the defaults according to the parsed subpage path
        if ( !empty( $this->mType ) ) {
            $a['type']['default'] = $this->mType;
        }
        if ( !empty( $this->mValue ) ) {
            $a['value']['default'] = $this->mValue;
        }

        return $a;
    }

    public function onSubmit( array $data ) {
        if ( !empty( $data['type'] ) && !empty( $data['value'] ) ) {
            $this->setParameter( $data['type'] . '/' . $data['value'] );
        }

        /* if this returns false, will show the form */
        return $this->dispatch();
    }

    public function onSuccess() {
        /* do nothing, we redirect in $this->dispatch if successful. */
    }

    protected function alterForm( HTMLForm $form ) {
        /* display summary at top of page */
        $this->outputHeader();
        // tweak label on submit button
        // Message: redirect-submit
        $form->setSubmitTextMsg( $this->getMessagePrefix() . '-submit' );
        /* submit form every time */
        $form->setMethod( 'get' );
    }

    protected function getDisplayFormat() {
        return 'ooui';
    }

    protected function getSubpagesForPrefixSearch() {
        return [
            'file',
            'page',
            'revision',
            'user',
            'logid',
        ];
    }

    public function requiresWrite() {
        return false;
    }

    public function requiresUnblock() {
        return false;
    }

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