includes/api/ApiFormatXml.php

   1 <?php
   2 /**
   3  *
   4  *
   5  * Created on Sep 19, 2006
   6  *
   7  * Copyright © 2006 Yuri Astrakhan <Firstname><Lastname>@gmail.com
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; if not, write to the Free Software Foundation, Inc.,
  21  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  22  * http://www.gnu.org/copyleft/gpl.html
  23  *
  24  * @file
  25  */
  26
  27 if ( !defined( 'MEDIAWIKI' ) ) {
  28         // Eclipse helper - will be ignored in production
  29         require_once( 'ApiFormatBase.php' );
  30 }
  31
  32 /**
  33  * API XML output formatter
  34  * @ingroup API
  35  */
  36 class ApiFormatXml extends ApiFormatBase {
  37
  38         private $mRootElemName = 'api';
  39         public static $namespace = 'http://www.mediawiki.org/xml/api/';
  40         private $mDoubleQuote = false;
  41         private $mXslt = null;
  42
  43         public function __construct( $main, $format ) {
  44                 parent::__construct( $main, $format );
  45         }
  46
  47         public function getMimeType() {
  48                 return 'text/xml';
  49         }
  50
  51         public function getNeedsRawData() {
  52                 return true;
  53         }
  54
  55         public function setRootElement( $rootElemName ) {
  56                 $this->mRootElemName = $rootElemName;
  57         }
  58
  59         public function execute() {
  60                 $params = $this->extractRequestParams();
  61                 $this->mDoubleQuote = $params['xmldoublequote'];
  62                 $this->mXslt = $params['xslt'];
  63
  64                 $this->printText( '<?xml version="1.0"?>' );
  65                 if ( !is_null( $this->mXslt ) ) {
  66                         $this->addXslt();
  67                 }
  68                 $this->printText(
  69                         self::recXmlPrint( $this->mRootElemName,
  70                                 array( 'xmlns' => self::$namespace ) + $this->getResultData(),
  71                                 $this->getIsHtml() ? - 2 : null,
  72                                 $this->mDoubleQuote
  73                         )
  74                 );
  75         }
  76
  77         /**
  78          * This method takes an array and converts it to XML.
  79          * There are several noteworthy cases:
  80          *
  81          *  If array contains a key '_element', then the code assumes that ALL other keys are not important and replaces them with the value['_element'].
  82          *      Example:        name='root',  value = array( '_element'=>'page', 'x', 'y', 'z') creates <root>  <page>x</page>  <page>y</page>  <page>z</page> </root>
  83          *
  84          *  If any of the array's element key is '*', then the code treats all other key->value pairs as attributes, and the value['*'] as the element's content.
  85          *      Example:        name='root',  value = array( '*'=>'text', 'lang'=>'en', 'id'=>10)   creates  <root lang='en' id='10'>text</root>
  86          *
  87          * If neither key is found, all keys become element names, and values become element content.
  88          * The method is recursive, so the same rules apply to any sub-arrays.
  89          *
  90          * @param $elemName
  91          * @param $elemValue
  92          * @param $indent
  93          * @param $doublequote bool
  94          *
  95          * @return string
  96          */
  97         public static function recXmlPrint( $elemName, $elemValue, $indent, $doublequote = false ) {
  98                 $retval = '';
  99                 if ( !is_null( $indent ) ) {
 100                         $indent += 2;
 101                         $indstr = "\n" . str_repeat( ' ', $indent );
 102                 } else {
 103                         $indstr = '';
 104                 }
 105                 $elemName = str_replace( ' ', '_', $elemName );
 106
 107                 switch ( gettype( $elemValue ) ) {
 108                         case 'array':
 109                                 if ( isset( $elemValue['*'] ) ) {
 110                                         $subElemContent = $elemValue['*'];
 111                                         if ( $doublequote ) {
 112                                                 $subElemContent = Sanitizer::encodeAttribute( $subElemContent );
 113                                         }
 114                                         unset( $elemValue['*'] );
 115
 116                                         // Add xml:space="preserve" to the
 117                                         // element so XML parsers will leave
 118                                         // whitespace in the content alone
 119                                         $elemValue['xml:space'] = 'preserve';
 120                                 } else {
 121                                         $subElemContent = null;
 122                                 }
 123
 124                                 if ( isset( $elemValue['_element'] ) ) {
 125                                         $subElemIndName = $elemValue['_element'];
 126                                         unset( $elemValue['_element'] );
 127                                 } else {
 128                                         $subElemIndName = null;
 129                                 }
 130
 131                                 $indElements = array();
 132                                 $subElements = array();
 133                                 foreach ( $elemValue as $subElemId => & $subElemValue ) {
 134                                         if ( is_string( $subElemValue ) && $doublequote ) {
 135                                                 $subElemValue = Sanitizer::encodeAttribute( $subElemValue );
 136                                         }
 137
 138                                         if ( gettype( $subElemId ) === 'integer' ) {
 139                                                 $indElements[] = $subElemValue;
 140                                                 unset( $elemValue[$subElemId] );
 141                                         } elseif ( is_array( $subElemValue ) ) {
 142                                                 $subElements[$subElemId] = $subElemValue;
 143                                                 unset ( $elemValue[$subElemId] );
 144                                         }
 145                                 }
 146
 147                                 if ( is_null( $subElemIndName ) && count( $indElements ) ) {
 148                                         ApiBase::dieDebug( __METHOD__, "($elemName, ...) has integer keys without _element value. Use ApiResult::setIndexedTagName()." );
 149                                 }
 150
 151                                 if ( count( $subElements ) && count( $indElements ) && !is_null( $subElemContent ) ) {
 152                                         ApiBase::dieDebug( __METHOD__, "($elemName, ...) has content and subelements" );
 153                                 }
 154
 155                                 if ( !is_null( $subElemContent ) ) {
 156                                         $retval .= $indstr . Xml::element( $elemName, $elemValue, $subElemContent );
 157                                 } elseif ( !count( $indElements ) && !count( $subElements ) ) {
 158                                         $retval .= $indstr . Xml::element( $elemName, $elemValue );
 159                                 } else {
 160                                         $retval .= $indstr . Xml::element( $elemName, $elemValue, null );
 161
 162                                         foreach ( $subElements as $subElemId => & $subElemValue ) {
 163                                                 $retval .= self::recXmlPrint( $subElemId, $subElemValue, $indent );
 164                                         }
 165
 166                                         foreach ( $indElements as &$subElemValue ) {
 167                                                 $retval .= self::recXmlPrint( $subElemIndName, $subElemValue, $indent );
 168                                         }
 169
 170                                         $retval .= $indstr . Xml::closeElement( $elemName );
 171                                 }
 172                                 break;
 173                         case 'object':
 174                                 // ignore
 175                                 break;
 176                         default:
 177                                 $retval .= $indstr . Xml::element( $elemName, null, $elemValue );
 178                                 break;
 179                 }
 180                 return $retval;
 181         }
 182
 183         function addXslt() {
 184                 $nt = Title::newFromText( $this->mXslt );
 185                 if ( is_null( $nt ) || !$nt->exists() ) {
 186                         $this->setWarning( 'Invalid or non-existent stylesheet specified' );
 187                         return;
 188                 }
 189                 if ( $nt->getNamespace() != NS_MEDIAWIKI ) {
 190                         $this->setWarning( 'Stylesheet should be in the MediaWiki namespace.' );
 191                         return;
 192                 }
 193                 if ( substr( $nt->getText(), - 4 ) !== '.xsl' ) {
 194                         $this->setWarning( 'Stylesheet should have .xsl extension.' );
 195                         return;
 196                 }
 197                 $this->printText( '<?xml-stylesheet href="' . $nt->escapeLocalURL( 'action=raw' ) . '" type="text/xsl" ?>' );
 198         }
 199
 200         public function getAllowedParams() {
 201                 return array(
 202                         'xmldoublequote' => false,
 203                         'xslt' => null,
 204                 );
 205         }
 206
 207         public function getParamDescription() {
 208                 return array(
 209                         'xmldoublequote' => 'If specified, double quotes all attributes and content',
 210                         'xslt' => 'If specified, adds <xslt> as stylesheet',
 211                 );
 212         }
 213
 214         public function getDescription() {
 215                 return 'Output data in XML format' . parent::getDescription();
 216         }
 217
 218         public function getVersion() {
 219                 return __CLASS__ . ': $Id$';
 220         }
 221 }