includes/specialpage/FormSpecialPage.php

   1 <?php
   2 /**
   3  * Special page which uses an HTMLForm to handle processing.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup SpecialPage
  22  */
  23
  24 /**
  25  * Special page which uses an HTMLForm to handle processing.  This is mostly a
  26  * clone of FormAction.  More special pages should be built this way; maybe this could be
  27  * a new structure for SpecialPages.
  28  *
  29  * @ingroup SpecialPage
  30  */
  31 abstract class FormSpecialPage extends SpecialPage {
  32         /**
  33          * The sub-page of the special page.
  34          * @var string
  35          */
  36         protected $par = null;
  37
  38         /**
  39          * Get an HTMLForm descriptor array
  40          * @return array
  41          */
  42         abstract protected function getFormFields();
  43
  44         /**
  45          * Add pre-text to the form
  46          * @return string HTML which will be sent to $form->addPreText()
  47          */
  48         protected function preText() {
  49                 return '';
  50         }
  51
  52         /**
  53          * Add post-text to the form
  54          * @return string HTML which will be sent to $form->addPostText()
  55          */
  56         protected function postText() {
  57                 return '';
  58         }
  59
  60         /**
  61          * Play with the HTMLForm if you need to more substantially
  62          * @param HTMLForm $form
  63          */
  64         protected function alterForm( HTMLForm $form ) {
  65         }
  66
  67         /**
  68          * Get message prefix for HTMLForm
  69          *
  70          * @since 1.21
  71          * @return string
  72          */
  73         protected function getMessagePrefix() {
  74                 return strtolower( $this->getName() );
  75         }
  76
  77         /**
  78          * Get the HTMLForm to control behavior
  79          * @return HTMLForm|null
  80          */
  81         protected function getForm() {
  82                 $this->fields = $this->getFormFields();
  83
  84                 $form = new HTMLForm( $this->fields, $this->getContext(), $this->getMessagePrefix() );
  85                 $form->setSubmitCallback( array( $this, 'onSubmit' ) );
  86                 // If the form is a compact vertical form, then don't output this ugly
  87                 // fieldset surrounding it.
  88                 // XXX Special pages can setDisplayFormat to 'vform' in alterForm(), but that
  89                 // is called after this.
  90                 if ( !$form->isVForm() ) {
  91                         $form->setWrapperLegendMsg( $this->getMessagePrefix() . '-legend' );
  92                 }
  93
  94                 $headerMsg = $this->msg( $this->getMessagePrefix() . '-text' );
  95                 if ( !$headerMsg->isDisabled() ) {
  96                         $form->addHeaderText( $headerMsg->parseAsBlock() );
  97                 }
  98
  99                 // Retain query parameters (uselang etc)
 100                 $params = array_diff_key(
 101                         $this->getRequest()->getQueryValues(), array( 'title' => null ) );
 102                 $form->addHiddenField( 'redirectparams', wfArrayToCgi( $params ) );
 103
 104                 $form->addPreText( $this->preText() );
 105                 $form->addPostText( $this->postText() );
 106                 $this->alterForm( $form );
 107
 108                 // Give hooks a chance to alter the form, adding extra fields or text etc
 109                 wfRunHooks( "Special{$this->getName()}BeforeFormDisplay", array( &$form ) );
 110
 111                 return $form;
 112         }
 113
 114         /**
 115          * Process the form on POST submission.
 116          * @param array $data
 117          * @return bool|array True for success, false for didn't-try, array of errors on failure
 118          */
 119         abstract public function onSubmit( array $data );
 120
 121         /**
 122          * Do something exciting on successful processing of the form, most likely to show a
 123          * confirmation message
 124          * @since 1.22 Default is to do nothing
 125          */
 126         public function onSuccess() {
 127         }
 128
 129         /**
 130          * Basic SpecialPage workflow: get a form, send it to the user; get some data back,
 131          *
 132          * @param string $par Subpage string if one was specified
 133          */
 134         public function execute( $par ) {
 135                 $this->setParameter( $par );
 136                 $this->setHeaders();
 137
 138                 // This will throw exceptions if there's a problem
 139                 $this->checkExecutePermissions( $this->getUser() );
 140
 141                 $form = $this->getForm();
 142                 if ( $form->show() ) {
 143                         $this->onSuccess();
 144                 }
 145         }
 146
 147         /**
 148          * Maybe do something interesting with the subpage parameter
 149          * @param string $par
 150          */
 151         protected function setParameter( $par ) {
 152                 $this->par = $par;
 153         }
 154
 155         /**
 156          * Called from execute() to check if the given user can perform this action.
 157          * Failures here must throw subclasses of ErrorPageError.
 158          * @param User $user
 159          * @throws UserBlockedError
 160          * @return bool True
 161          */
 162         protected function checkExecutePermissions( User $user ) {
 163                 $this->checkPermissions();
 164
 165                 if ( $this->requiresUnblock() && $user->isBlocked() ) {
 166                         $block = $user->getBlock();
 167                         throw new UserBlockedError( $block );
 168                 }
 169
 170                 if ( $this->requiresWrite() ) {
 171                         $this->checkReadOnly();
 172                 }
 173
 174                 return true;
 175         }
 176
 177         /**
 178          * Whether this action requires the wiki not to be locked
 179          * @return bool
 180          */
 181         public function requiresWrite() {
 182                 return true;
 183         }
 184
 185         /**
 186          * Whether this action cannot be executed by a blocked user
 187          * @return bool
 188          */
 189         public function requiresUnblock() {
 190                 return true;
 191         }
 192 }