SiteImporter.php

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<?php

class SiteImporter {

    private $store;

    private $exceptionCallback;

    public function __construct( SiteStore $store ) {
        $this->store = $store;
    }

    public function getExceptionCallback() {
        return $this->exceptionCallback;
    }

    public function setExceptionCallback( $exceptionCallback ) {
        $this->exceptionCallback = $exceptionCallback;
    }

    public function importFromFile( $file ) {
        $xml = file_get_contents( $file );

        if ( $xml === false ) {
            throw new RuntimeException( 'Failed to read ' . $file . '!' );
        }

        $this->importFromXML( $xml );
    }

    public function importFromXML( $xml ) {
        $document = new DOMDocument();

        $oldLibXmlErrors = libxml_use_internal_errors( true );
        $ok = $document->loadXML( $xml, LIBXML_NONET );

        if ( !$ok ) {
            $errors = libxml_get_errors();
            libxml_use_internal_errors( $oldLibXmlErrors );

            foreach ( $errors as $error ) {
                throw new InvalidArgumentException(
                    'Malformed XML: ' . $error->message . ' in line ' . $error->line
                );
            }

            throw new InvalidArgumentException( 'Malformed XML!' );
        }

        libxml_use_internal_errors( $oldLibXmlErrors );
        $this->importFromDOM( $document->documentElement );
    }

    private function importFromDOM( DOMElement $root ) {
        $sites = $this->makeSiteList( $root );
        $this->store->saveSites( $sites );
    }

    private function makeSiteList( DOMElement $root ) {
        $sites = [];

        // Old sites, to get the row IDs that correspond to the global site IDs.
        // TODO: Get rid of internal row IDs, they just get in the way. Get rid of ORMRow, too.
        $oldSites = $this->store->getSites();

        $current = $root->firstChild;
        while ( $current ) {
            if ( $current instanceof DOMElement && $current->tagName === 'site' ) {
                try {
                    $site = $this->makeSite( $current );
                    $key = $site->getGlobalId();

                    if ( $oldSites->hasSite( $key ) ) {
                        $oldSite = $oldSites->getSite( $key );
                        $site->setInternalId( $oldSite->getInternalId() );
                    }

                    $sites[$key] = $site;
                } catch ( Exception $ex ) {
                    $this->handleException( $ex );
                }
            }

            $current = $current->nextSibling;
        }

        return $sites;
    }

    public function makeSite( DOMElement $siteElement ) {
        if ( $siteElement->tagName !== 'site' ) {
            throw new InvalidArgumentException( 'Expected <site> tag, found ' . $siteElement->tagName );
        }

        $type = $this->getAttributeValue( $siteElement, 'type', Site::TYPE_UNKNOWN );
        $site = Site::newForType( $type );

        $site->setForward( $this->hasChild( $siteElement, 'forward' ) );
        $site->setGlobalId( $this->getChildText( $siteElement, 'globalid' ) );
        $site->setGroup( $this->getChildText( $siteElement, 'group', Site::GROUP_NONE ) );
        $site->setSource( $this->getChildText( $siteElement, 'source', Site::SOURCE_LOCAL ) );

        $pathTags = $siteElement->getElementsByTagName( 'path' );
        for ( $i = 0; $i < $pathTags->length; $i++ ) {
            $pathElement = $pathTags->item( $i );
            $pathType = $this->getAttributeValue( $pathElement, 'type' );
            $path = $pathElement->textContent;

            $site->setPath( $pathType, $path );
        }

        $idTags = $siteElement->getElementsByTagName( 'localid' );
        for ( $i = 0; $i < $idTags->length; $i++ ) {
            $idElement = $idTags->item( $i );
            $idType = $this->getAttributeValue( $idElement, 'type' );
            $id = $idElement->textContent;

            $site->addLocalId( $idType, $id );
        }

        // @todo: import <data>
        // @todo: import <config>

        return $site;
    }

    private function getAttributeValue( DOMElement $element, $name, $default = false ) {
        $node = $element->getAttributeNode( $name );

        if ( !$node ) {
            if ( $default !== false ) {
                return $default;
            } else {
                throw new MWException(
                    'Required ' . $name . ' attribute not found in <' . $element->tagName . '> tag'
                );
            }
        }

        return $node->textContent;
    }

    private function getChildText( DOMElement $element, $name, $default = false ) {
        $elements = $element->getElementsByTagName( $name );

        if ( $elements->length < 1 ) {
            if ( $default !== false ) {
                return $default;
            } else {
                throw new MWException(
                    'Required <' . $name . '> tag not found inside <' . $element->tagName . '> tag'
                );
            }
        }

        $node = $elements->item( 0 );
        return $node->textContent;
    }

    private function hasChild( DOMElement $element, $name ) {
        return $this->getChildText( $element, $name, null ) !== null;
    }

    private function handleException( Exception $ex ) {
        if ( $this->exceptionCallback ) {
            call_user_func( $this->exceptionCallback, $ex );
        } else {
            wfLogWarning( $ex->getMessage() );
        }
    }

}