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<?php
/**
* Special page which uses an HTMLForm to handle processing.
*
* 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
*/
/**
* Special page which uses an HTMLForm to handle processing. This is mostly a
* clone of FormAction. More special pages should be built this way; maybe this could be
* a new structure for SpecialPages.
*
* @ingroup SpecialPage
*/
abstract class FormSpecialPage extends SpecialPage {
/**
* The sub-page of the special page.
* @var string
*/
protected $par = null;
/**
* Get an HTMLForm descriptor array
* @return array
*/
abstract protected function getFormFields();
/**
* Add pre-text to the form
* @return string HTML which will be sent to $form->addPreText()
*/
protected function preText() {
return '';
}
/**
* Add post-text to the form
* @return string HTML which will be sent to $form->addPostText()
*/
protected function postText() {
return '';
}
/**
* Play with the HTMLForm if you need to more substantially
* @param HTMLForm $form
*/
protected function alterForm( HTMLForm $form ) {
}
/**
* Get message prefix for HTMLForm
*
* @since 1.21
* @return string
*/
protected function getMessagePrefix() {
return strtolower( $this->getName() );
}
/**
* Get the HTMLForm to control behavior
* @return HTMLForm|null
*/
protected function getForm() {
$this->fields = $this->getFormFields();
$form = new HTMLForm( $this->fields, $this->getContext(), $this->getMessagePrefix() );
$form->setSubmitCallback( array( $this, 'onSubmit' ) );
// If the form is a compact vertical form, then don't output this ugly
// fieldset surrounding it.
// XXX Special pages can setDisplayFormat to 'vform' in alterForm(), but that
// is called after this.
if ( !$form->isVForm() ) {
$form->setWrapperLegendMsg( $this->getMessagePrefix() . '-legend' );
}
$headerMsg = $this->msg( $this->getMessagePrefix() . '-text' );
if ( !$headerMsg->isDisabled() ) {
$form->addHeaderText( $headerMsg->parseAsBlock() );
}
// Retain query parameters (uselang etc)
$params = array_diff_key(
$this->getRequest()->getQueryValues(), array( 'title' => null ) );
$form->addHiddenField( 'redirectparams', wfArrayToCgi( $params ) );
$form->addPreText( $this->preText() );
$form->addPostText( $this->postText() );
$this->alterForm( $form );
// Give hooks a chance to alter the form, adding extra fields or text etc
wfRunHooks( 'SpecialPageBeforeFormDisplay', array( $this->getName(), &$form ) );
return $form;
}
/**
* Process the form on POST submission.
* @param array $data
* @param HTMLForm $form
* @return bool|string|array|Status As documented for HTMLForm::trySubmit.
*/
abstract public function onSubmit( array $data /* $form = null */ );
/**
* Do something exciting on successful processing of the form, most likely to show a
* confirmation message
* @since 1.22 Default is to do nothing
*/
public function onSuccess() {
}
/**
* Basic SpecialPage workflow: get a form, send it to the user; get some data back,
*
* @param string $par Subpage string if one was specified
*/
public function execute( $par ) {
$this->setParameter( $par );
$this->setHeaders();
// This will throw exceptions if there's a problem
$this->checkExecutePermissions( $this->getUser() );
$form = $this->getForm();
if ( $form->show() ) {
$this->onSuccess();
}
}
/**
* Maybe do something interesting with the subpage parameter
* @param string $par
*/
protected function setParameter( $par ) {
$this->par = $par;
}
/**
* Called from execute() to check if the given user can perform this action.
* Failures here must throw subclasses of ErrorPageError.
* @param User $user
* @throws UserBlockedError
* @return bool True
*/
protected function checkExecutePermissions( User $user ) {
$this->checkPermissions();
if ( $this->requiresUnblock() && $user->isBlocked() ) {
$block = $user->getBlock();
throw new UserBlockedError( $block );
}
if ( $this->requiresWrite() ) {
$this->checkReadOnly();
}
return true;
}
/**
* Whether this action requires the wiki not to be locked
* @return bool
*/
public function requiresWrite() {
return true;
}
/**
* Whether this action cannot be executed by a blocked user
* @return bool
*/
public function requiresUnblock() {
return true;
}
}
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