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<?php
/**
* Implements Special:Redirect
*
* @section LICENSE
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
* @ingroup SpecialPage
*/
/**
* A special page that redirects to: the user for a numeric user id,
* the file for a given filename, or the page for a given revision id.
*
* @ingroup SpecialPage
* @since 1.22
*/
class SpecialRedirect extends FormSpecialPage {
/**
* The type of the redirect (user/file/revision)
*
* @var string $mType
* @example 'user'
*/
protected $mType;
/**
* The identifier/value for the redirect (which id, which file)
*
* @var string $mValue
* @example '42'
*/
protected $mValue;
function __construct() {
parent::__construct( 'Redirect' );
$this->mType = null;
$this->mValue = null;
}
/**
* Set $mType and $mValue based on parsed value of $subpage.
*/
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;
}
/**
* Handle Special:Redirect/user/xxxx (by redirecting to User:YYYY)
*
* @return string|null url to redirect to, or null if $mValue is invalid.
*/
function dispatchUser() {
if ( !ctype_digit( $this->mValue ) ) {
return null;
}
$user = User::newFromId( (int)$this->mValue );
$username = $user->getName(); // load User as side-effect
if ( $user->isAnon() ) {
return null;
}
$userpage = Title::makeTitle( NS_USER, $username );
return $userpage->getFullURL( '', false, PROTO_CURRENT );
}
/**
* Handle Special:Redirect/file/xxxx
*
* @return string|null url to redirect to, or null if $mValue is not found.
*/
function dispatchFile() {
$title = Title::makeTitleSafe( NS_FILE, $this->mValue );
if ( ! $title instanceof Title ) {
return null;
}
$file = wfFindFile( $title );
if ( !$file || !$file->exists() ) {
return null;
}
// 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( array( 'width' => $width, 'height' => $height ) );
// ... and we can
if ( $mto && !$mto->isError() ) {
// ... change the URL to point to a thumbnail.
$url = $mto->getURL();
}
}
return $url;
}
/**
* Handle Special:Redirect/revision/xxx
* (by redirecting to index.php?oldid=xxx)
*
* @return string|null url to redirect to, or null if $mValue is invalid.
*/
function dispatchRevision() {
$oldid = $this->mValue;
if ( !ctype_digit( $oldid ) ) {
return null;
}
$oldid = (int)$oldid;
if ( $oldid === 0 ) {
return null;
}
return wfAppendQuery( wfScript( 'index' ), array(
'oldid' => $oldid
) );
}
/**
* Use appropriate dispatch* method to obtain a redirection URL,
* and either: redirect, set a 404 error code and error message,
* or do nothing (if $mValue wasn't set) allowing the form to be
* displayed.
*
* @return bool true if a redirect was successfully handled.
*/
function dispatch() {
// the various namespaces supported by Special:Redirect
switch ( $this->mType ) {
case 'user':
$url = $this->dispatchUser();
break;
case 'file':
$url = $this->dispatchFile();
break;
case 'revision':
$url = $this->dispatchRevision();
break;
default:
$this->getOutput()->setStatusCode( 404 );
$url = null;
break;
}
if ( $url ) {
$this->getOutput()->redirect( $url );
return true;
}
if ( !is_null( $this->mValue ) ) {
$this->getOutput()->setStatusCode( 404 );
// Message: redirect-not-exists
$msg = $this->getMessagePrefix() . '-not-exists';
return Status::newFatal( $msg );
}
return false;
}
protected function getFormFields() {
$mp = $this->getMessagePrefix();
$ns = array(
// subpage => message
// Messages: redirect-user, redirect-revision, redirect-file
'user' => $mp . '-user',
'revision' => $mp . '-revision',
'file' => $mp . '-file',
);
$a = array();
$a['type'] = array(
'type' => 'select',
'label-message' => $mp . '-lookup', // Message: redirect-lookup
'options' => array(),
'default' => current( array_keys( $ns ) ),
);
foreach ( $ns as $n => $m ) {
$m = $this->msg( $m )->text();
$a['type']['options'][$m] = $n;
}
$a['value'] = array(
'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 getGroupName() {
return 'redirects';
}
}
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