includes/api/ApiComparePages.php

   1 <?php
   2 /**
   3  *
   4  * Created on May 1, 2011
   5  *
   6  * Copyright © 2011 Sam Reed
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License along
  19  * with this program; if not, write to the Free Software Foundation, Inc.,
  20  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  21  * http://www.gnu.org/copyleft/gpl.html
  22  *
  23  * @file
  24  */
  25
  26 class ApiComparePages extends ApiBase {
  27
  28         public function __construct( $main, $action ) {
  29                 parent::__construct( $main, $action );
  30         }
  31
  32         public function execute() {
  33                 $params = $this->extractRequestParams();
  34
  35                 $rev1 = $this->revisionOrTitleOrId( $params['fromrev'], $params['fromtitle'], $params['fromid'] );
  36                 $rev2 = $this->revisionOrTitleOrId( $params['torev'], $params['totitle'], $params['toid'] );
  37
  38                 $de = new DifferenceEngine( $this->getContext(),
  39                         $rev1,
  40                         $rev2,
  41                         null, // rcid
  42                         true,
  43                         false );
  44
  45                 $vals = array();
  46                 if ( isset( $params['fromtitle'] ) ) {
  47                         $vals['fromtitle'] = $params['fromtitle'];
  48                 }
  49                 if ( isset( $params['fromid'] ) ) {
  50                         $vals['fromid'] = $params['fromid'];
  51                 }
  52                 $vals['fromrevid'] = $rev1;
  53                 if ( isset( $params['totitle'] ) ) {
  54                         $vals['totitle'] = $params['totitle'];
  55                 }
  56                 if ( isset( $params['toid'] ) ) {
  57                         $vals['toid'] = $params['toid'];
  58                 }
  59                 $vals['torevid'] = $rev2;
  60
  61                 $difftext = $de->getDiffBody();
  62
  63                 if ( $difftext === false ) {
  64                         $this->dieUsage( 'The diff cannot be retrieved. ' .
  65                                 'Maybe one or both revisions do not exist or you do not have permission to view them.', 'baddiff' );
  66                 } else {
  67                         ApiResult::setContent( $vals, $difftext );
  68                 }
  69
  70                 $this->getResult()->addValue( null, $this->getModuleName(), $vals );
  71         }
  72
  73         /**
  74          * @param $revision int
  75          * @param $titleText string
  76          * @param $titleId int
  77          * @return int
  78          */
  79         private function revisionOrTitleOrId( $revision, $titleText, $titleId ) {
  80                 if( $revision ){
  81                         return $revision;
  82                 } elseif( $titleText ) {
  83                         $title = Title::newFromText( $titleText );
  84                         if( !$title ){
  85                                 $this->dieUsageMsg( array( 'invalidtitle', $titleText ) );
  86                         }
  87                         return $title->getLatestRevID();
  88                 } elseif ( $titleId ) {
  89                         $title = Title::newFromID( $titleId );
  90                         if( !$title ) {
  91                                 $this->dieUsageMsg( array( 'nosuchpageid', $titleId ) );
  92                         }
  93                         return $title->getLatestRevID();
  94                 }
  95                 $this->dieUsage( 'inputneeded', 'A title, a page ID, or a revision number is needed for both the from and the to parameters' );
  96         }
  97
  98         public function getAllowedParams() {
  99                 return array(
 100                         'fromtitle' => null,
 101                         'fromid' => array(
 102                                 ApiBase::PARAM_TYPE => 'integer'
 103                         ),
 104                         'fromrev' => array(
 105                                 ApiBase::PARAM_TYPE => 'integer'
 106                         ),
 107                         'totitle' => null,
 108                         'toid' => array(
 109                                 ApiBase::PARAM_TYPE => 'integer'
 110                         ),
 111                         'torev' => array(
 112                                 ApiBase::PARAM_TYPE => 'integer'
 113                         ),
 114                 );
 115         }
 116
 117         public function getParamDescription() {
 118                 return array(
 119                         'fromtitle' => 'First title to compare',
 120                         'fromid' => 'First page ID to compare',
 121                         'fromrev' => 'First revision to compare',
 122                         'totitle' => 'Second title to compare',
 123                         'toid' => 'Second page ID to compare',
 124                         'torev' => 'Second revision to compare',
 125                 );
 126         }
 127         public function getDescription() {
 128                 return array(
 129                         'Get the difference between 2 pages',
 130                         'You must pass a revision number or a page title or a page ID id for each part (1 and 2)'
 131                 );
 132         }
 133
 134         public function getPossibleErrors() {
 135                 return array_merge( parent::getPossibleErrors(), array(
 136                         array( 'code' => 'inputneeded', 'info' => 'A title or a revision is needed' ),
 137                         array( 'invalidtitle', 'title' ),
 138                         array( 'nosuchpageid', 'pageid' ),
 139                         array( 'code' => 'baddiff', 'info' => 'The diff cannot be retrieved. Maybe one or both revisions do not exist or you do not have permission to view them.' ),
 140                 ) );
 141         }
 142
 143         public function getExamples() {
 144                 return array(
 145                         'api.php?action=compare&fromrev=1&torev=2' => 'Create a diff between revision 1 and 2',
 146                 );
 147         }
 148
 149         public function getVersion() {
 150                 return __CLASS__ . ': $Id$';
 151         }
 152 }