ApiFormatXml.php

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<?php
class ApiFormatXml extends ApiFormatBase {

    private $mRootElemName = 'api';
    public static $namespace = 'http://www.mediawiki.org/xml/api/';
    private $mIncludeNamespace = false;
    private $mXslt = null;

    public function getMimeType() {
        return 'text/xml';
    }

    public function getNeedsRawData() {
        return true;
    }

    public function setRootElement( $rootElemName ) {
        $this->mRootElemName = $rootElemName;
    }

    public function execute() {
        $params = $this->extractRequestParams();
        $this->mIncludeNamespace = $params['includexmlnamespace'];
        $this->mXslt = $params['xslt'];

        $this->printText( '<?xml version="1.0"?>' );
        if ( !is_null( $this->mXslt ) ) {
            $this->addXslt();
        }
        if ( $this->mIncludeNamespace ) {
            // If the result data already contains an 'xmlns' namespace added
            // for custom XML output types, it will override the one for the
            // generic API results.
            // This allows API output of other XML types like Atom, RSS, RSD.
            $data = $this->getResultData() + array( 'xmlns' => self::$namespace );
        } else {
            $data = $this->getResultData();
        }

        $this->printText(
            self::recXmlPrint( $this->mRootElemName,
                $data,
                $this->getIsHtml() ? -2 : null
            )
        );
    }

    public static function recXmlPrint( $elemName, $elemValue, $indent ) {
        $retval = '';
        if ( !is_null( $indent ) ) {
            $indent += 2;
            $indstr = "\n" . str_repeat( ' ', $indent );
        } else {
            $indstr = '';
        }
        $elemName = str_replace( ' ', '_', $elemName );

        if ( is_array( $elemValue ) ) {
            if ( isset( $elemValue['*'] ) ) {
                $subElemContent = $elemValue['*'];
                unset( $elemValue['*'] );

                // Add xml:space="preserve" to the
                // element so XML parsers will leave
                // whitespace in the content alone
                $elemValue['xml:space'] = 'preserve';
            } else {
                $subElemContent = null;
            }

            if ( isset( $elemValue['_element'] ) ) {
                $subElemIndName = $elemValue['_element'];
                unset( $elemValue['_element'] );
            } else {
                $subElemIndName = null;
            }

            $indElements = array();
            $subElements = array();
            foreach ( $elemValue as $subElemId => & $subElemValue ) {
                if ( is_int( $subElemId ) ) {
                    $indElements[] = $subElemValue;
                    unset( $elemValue[$subElemId] );
                } elseif ( is_array( $subElemValue ) ) {
                    $subElements[$subElemId] = $subElemValue;
                    unset( $elemValue[$subElemId] );
                } elseif ( is_bool( $subElemValue ) ) {
                    // treat true as empty string, skip false in xml format
                    if ( $subElemValue === true ) {
                        $subElemValue = '';
                    } else {
                        unset( $elemValue[$subElemId] );
                    }
                }
            }

            if ( is_null( $subElemIndName ) && count( $indElements ) ) {
                ApiBase::dieDebug( __METHOD__, "($elemName, ...) has integer keys " .
                    "without _element value. Use ApiResult::setIndexedTagName()." );
            }

            if ( count( $subElements ) && count( $indElements ) && !is_null( $subElemContent ) ) {
                ApiBase::dieDebug( __METHOD__, "($elemName, ...) has content and subelements" );
            }

            if ( !is_null( $subElemContent ) ) {
                $retval .= $indstr . Xml::element( $elemName, $elemValue, $subElemContent );
            } elseif ( !count( $indElements ) && !count( $subElements ) ) {
                $retval .= $indstr . Xml::element( $elemName, $elemValue );
            } else {
                $retval .= $indstr . Xml::element( $elemName, $elemValue, null );

                foreach ( $subElements as $subElemId => & $subElemValue ) {
                    $retval .= self::recXmlPrint( $subElemId, $subElemValue, $indent );
                }

                foreach ( $indElements as &$subElemValue ) {
                    $retval .= self::recXmlPrint( $subElemIndName, $subElemValue, $indent );
                }

                $retval .= $indstr . Xml::closeElement( $elemName );
            }
        } elseif ( !is_object( $elemValue ) ) {
            // to make sure null value doesn't produce unclosed element,
            // which is what Xml::element( $elemName, null, null ) returns
            if ( $elemValue === null ) {
                $retval .= $indstr . Xml::element( $elemName );
            } else {
                $retval .= $indstr . Xml::element( $elemName, null, $elemValue );
            }
        }

        return $retval;
    }

    function addXslt() {
        $nt = Title::newFromText( $this->mXslt );
        if ( is_null( $nt ) || !$nt->exists() ) {
            $this->setWarning( 'Invalid or non-existent stylesheet specified' );

            return;
        }
        if ( $nt->getNamespace() != NS_MEDIAWIKI ) {
            $this->setWarning( 'Stylesheet should be in the MediaWiki namespace.' );

            return;
        }
        if ( substr( $nt->getText(), -4 ) !== '.xsl' ) {
            $this->setWarning( 'Stylesheet should have .xsl extension.' );

            return;
        }
        $this->printText( '<?xml-stylesheet href="' .
            htmlspecialchars( $nt->getLocalURL( 'action=raw' ) ) . '" type="text/xsl" ?>' );
    }

    public function getAllowedParams() {
        return array(
            'xslt' => null,
            'includexmlnamespace' => false,
        );
    }

    public function getParamDescription() {
        return array(
            'xslt' => 'If specified, adds <xslt> as stylesheet. This should be a wiki page '
                . 'in the MediaWiki namespace whose page name ends with ".xsl"',
            'includexmlnamespace' => 'If specified, adds an XML namespace'
        );
    }

    public function getDescription() {
        return 'Output data in XML format' . parent::getDescription();
    }
}