extensions/CreateBox/CreateBox.php

<?php
/*

 CreateBox v1.6 -- Specialized Inputbox for page creation

 Author: Ross McClure
 http://www.mediawiki.org/wiki/User:Algorithm

 Inputbox written by Erik Moeller <moeller@scireview.de>

 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

 To install, add following to LocalSettings.php
   require_once("extensions/CreateBox/CreateBox.php");
*/

if ( !defined( 'MEDIAWIKI' ) ) {
	die( "This is not a valid entry point.\n" );
}

$wgHooks['ParserFirstCallInit'][] = 'wfCreateBox';

$wgHooks['UnknownAction'][] = 'actionCreate';
$wgExtensionCredits['parserhook'][] = array(
	'path' => __FILE__,
	'name' => 'CreateBox',
	'author' => 'Ross McClure',
	'version' => '1.6',
	'url' => 'https://www.mediawiki.org/wiki/Extension:CreateBox',
	'descriptionmsg' => 'createbox-desc',
);

$dir = dirname( __FILE__ ) . '/';
$wgExtensionMessagesFiles['CreateBox'] = $dir . 'CreateBox.i18n.php';

function wfCreateBox( $parser ) {
	$parser->setHook( 'createbox', 'acMakeBox' );
	return true;
}

function actionCreate( $action, $article ) {
	if( $action != 'create' ) {
		return true;
	}

	global $wgRequest;
	$prefix = $wgRequest->getVal( 'prefix' );
	$text = $wgRequest->getVal( 'title' );
	if( $prefix && strpos( $text, $prefix ) !== 0 ) {
		$title = Title::newFromText( $prefix . $text );
		if( is_null( $title ) ) {
			global $wgTitle;
			$wgTitle = SpecialPage::getTitleFor( 'Badtitle' );
			throw new ErrorPageError( 'badtitle', 'badtitletext' );
		} elseif( $title->getArticleID() == 0 ) {
			acRedirect( $title, 'edit' );
		} else {
			acRedirect( $title, 'create' );
		}
	} elseif( $wgRequest->getVal( 'section' ) == 'new' || $article->getID() == 0 ) {
		acRedirect( $article->getTitle(), 'edit' );
	} else {
		global $wgOut;
		$text = $article->getTitle()->getPrefixedText();
		$wgOut->setPageTitle( $text );
		$wgOut->setHTMLTitle( wfMsg( 'pagetitle', $text . ' - ' . wfMsg( 'createbox-create' ) ) );
		$wgOut->addWikiMsg( 'createbox-exists' );
	}
	return false;
}

function acGetOption( $input, $name, $value = null ) {
	if( preg_match( "/^\s*$name\s*=\s*(.*)/mi", $input, $matches ) ) {
		if( is_int( $value ) ) {
			return intval( $matches[1] );
		} else {
			return htmlspecialchars( $matches[1] );
		}
	}
	return $value;
}

function acMakeBox( $input, $argv, $parser ) {
	global $wgRequest, $wgScript;
	if( $wgRequest->getVal( 'action' ) == 'create' ) {
		$prefix = acGetOption( $input, 'prefix' );
		$preload = acGetOption( $input, 'preload' );
		$editintro = acGetOption( $input, 'editintro' ); 
		$text = $parser->getTitle()->getPrefixedText();
		if( $prefix && strpos( $text, $prefix ) === 0 ) {
			$text = substr( $text, strlen( $prefix ) );
		}
	} else {
		$prefix = acGetOption( $input, 'prefix' );
		$preload = acGetOption( $input, 'preload' );
		$editintro = acGetOption( $input, 'editintro' );
		$text = acGetOption( $input, 'default' );
	}
	$submit = htmlspecialchars( $wgScript );
	$width = acGetOption( $input, 'width', 0 );
	$align = acGetOption( $input, 'align', 'center' );
	$br = ( ( acGetOption( $input, 'break', 'no' ) == 'no' ) ? '' : '<br />' );
	$label = acGetOption( $input, 'buttonlabel', wfMsgHtml( 'createbox-create' ) );
	$output = <<<ENDFORM
<div class="createbox" align="{$align}">
<form name="createbox" action="{$submit}" method="get" class="createboxForm">
<input type='hidden' name="action" value="create">
<input type="hidden" name="prefix" value="{$prefix}" />
<input type="hidden" name="preload" value="{$preload}" />
<input type="hidden" name="editintro" value="{$editintro}" />
<input class="createboxInput" name="title" type="text" value="{$text}" size="{$width}"/>{$br}
<input type='submit' name="create" class="createboxButton" value="{$label}"/>
</form></div>
ENDFORM;
	return $parser->replaceVariables( $output );
}

function acRedirect( $title, $action ) {
	global $wgRequest, $wgOut;
	$query = "action={$action}&prefix=" . $wgRequest->getVal( 'prefix' ) .
		'&preload=' . $wgRequest->getVal( 'preload' ) .
		'&editintro=' . $wgRequest->getVal( 'editintro' ) .
		'&section=' . $wgRequest->getVal( 'section' );
	$wgOut->setSquidMaxage( 1200 );
	$wgOut->redirect( $title->getFullURL( $query ), '301' );
}