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diff --git a/www/wiki/includes/context/DerivativeContext.php b/www/wiki/includes/context/DerivativeContext.php
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+++ b/www/wiki/includes/context/DerivativeContext.php
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+<?php
+/**
+ * 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
+ *
+ * @author Daniel Friesen
+ * @file
+ */
+use MediaWiki\MediaWikiServices;
+
+/**
+ * An IContextSource implementation which will inherit context from another source
+ * but allow individual pieces of context to be changed locally
+ * eg: A ContextSource that can inherit from the main RequestContext but have
+ *     a different Title instance set on it.
+ * @since 1.19
+ */
+class DerivativeContext extends ContextSource implements MutableContext {
+	/**
+	 * @var WebRequest
+	 */
+	private $request;
+
+	/**
+	 * @var Title
+	 */
+	private $title;
+
+	/**
+	 * @var WikiPage
+	 */
+	private $wikipage;
+
+	/**
+	 * @var OutputPage
+	 */
+	private $output;
+
+	/**
+	 * @var User
+	 */
+	private $user;
+
+	/**
+	 * @var Language
+	 */
+	private $lang;
+
+	/**
+	 * @var Skin
+	 */
+	private $skin;
+
+	/**
+	 * @var Config
+	 */
+	private $config;
+
+	/**
+	 * @var Timing
+	 */
+	private $timing;
+
+	/**
+	 * @param IContextSource $context Context to inherit from
+	 */
+	public function __construct( IContextSource $context ) {
+		$this->setContext( $context );
+	}
+
+	/**
+	 * @param Config $config
+	 */
+	public function setConfig( Config $config ) {
+		$this->config = $config;
+	}
+
+	/**
+	 * @return Config
+	 */
+	public function getConfig() {
+		if ( !is_null( $this->config ) ) {
+			return $this->config;
+		} else {
+			return $this->getContext()->getConfig();
+		}
+	}
+
+	/**
+	 * @deprecated since 1.27 use a StatsdDataFactory from MediaWikiServices (preferably injected)
+	 *
+	 * @return IBufferingStatsdDataFactory
+	 */
+	public function getStats() {
+		return MediaWikiServices::getInstance()->getStatsdDataFactory();
+	}
+
+	/**
+	 * @return Timing
+	 */
+	public function getTiming() {
+		if ( !is_null( $this->timing ) ) {
+			return $this->timing;
+		} else {
+			return $this->getContext()->getTiming();
+		}
+	}
+
+	/**
+	 * @param WebRequest $request
+	 */
+	public function setRequest( WebRequest $request ) {
+		$this->request = $request;
+	}
+
+	/**
+	 * @return WebRequest
+	 */
+	public function getRequest() {
+		if ( !is_null( $this->request ) ) {
+			return $this->request;
+		} else {
+			return $this->getContext()->getRequest();
+		}
+	}
+
+	/**
+	 * @param Title $title
+	 */
+	public function setTitle( Title $title ) {
+		$this->title = $title;
+	}
+
+	/**
+	 * @return Title|null
+	 */
+	public function getTitle() {
+		if ( !is_null( $this->title ) ) {
+			return $this->title;
+		} else {
+			return $this->getContext()->getTitle();
+		}
+	}
+
+	/**
+	 * Check whether a WikiPage object can be get with getWikiPage().
+	 * Callers should expect that an exception is thrown from getWikiPage()
+	 * if this method returns false.
+	 *
+	 * @since 1.19
+	 * @return bool
+	 */
+	public function canUseWikiPage() {
+		if ( $this->wikipage !== null ) {
+			return true;
+		} elseif ( $this->title !== null ) {
+			return $this->title->canExist();
+		} else {
+			return $this->getContext()->canUseWikiPage();
+		}
+	}
+
+	/**
+	 * @since 1.19
+	 * @param WikiPage $wikiPage
+	 */
+	public function setWikiPage( WikiPage $wikiPage ) {
+		$this->wikipage = $wikiPage;
+	}
+
+	/**
+	 * Get the WikiPage object.
+	 * May throw an exception if there's no Title object set or the Title object
+	 * belongs to a special namespace that doesn't have WikiPage, so use first
+	 * canUseWikiPage() to check whether this method can be called safely.
+	 *
+	 * @since 1.19
+	 * @return WikiPage
+	 */
+	public function getWikiPage() {
+		if ( !is_null( $this->wikipage ) ) {
+			return $this->wikipage;
+		} else {
+			return $this->getContext()->getWikiPage();
+		}
+	}
+
+	/**
+	 * @param OutputPage $output
+	 */
+	public function setOutput( OutputPage $output ) {
+		$this->output = $output;
+	}
+
+	/**
+	 * @return OutputPage
+	 */
+	public function getOutput() {
+		if ( !is_null( $this->output ) ) {
+			return $this->output;
+		} else {
+			return $this->getContext()->getOutput();
+		}
+	}
+
+	/**
+	 * @param User $user
+	 */
+	public function setUser( User $user ) {
+		$this->user = $user;
+	}
+
+	/**
+	 * @return User
+	 */
+	public function getUser() {
+		if ( !is_null( $this->user ) ) {
+			return $this->user;
+		} else {
+			return $this->getContext()->getUser();
+		}
+	}
+
+	/**
+	 * @param Language|string $language Language instance or language code
+	 * @throws MWException
+	 * @since 1.19
+	 */
+	public function setLanguage( $language ) {
+		if ( $language instanceof Language ) {
+			$this->lang = $language;
+		} elseif ( is_string( $language ) ) {
+			$language = RequestContext::sanitizeLangCode( $language );
+			$obj = Language::factory( $language );
+			$this->lang = $obj;
+		} else {
+			throw new MWException( __METHOD__ . " was passed an invalid type of data." );
+		}
+	}
+
+	/**
+	 * @return Language
+	 * @since 1.19
+	 */
+	public function getLanguage() {
+		if ( !is_null( $this->lang ) ) {
+			return $this->lang;
+		} else {
+			return $this->getContext()->getLanguage();
+		}
+	}
+
+	/**
+	 * @param Skin $skin
+	 */
+	public function setSkin( Skin $skin ) {
+		$this->skin = clone $skin;
+		$this->skin->setContext( $this );
+	}
+
+	/**
+	 * @return Skin
+	 */
+	public function getSkin() {
+		if ( !is_null( $this->skin ) ) {
+			return $this->skin;
+		} else {
+			return $this->getContext()->getSkin();
+		}
+	}
+
+	/**
+	 * Get a message using the current context.
+	 *
+	 * This can't just inherit from ContextSource, since then
+	 * it would set only the original context, and not take
+	 * into account any changes.
+	 *
+	 * @param string|string[]|MessageSpecifier $key Message key, or array of keys,
+	 *   or a MessageSpecifier.
+	 * @param mixed $args,... Arguments to wfMessage
+	 * @return Message
+	 */
+	public function msg( $key ) {
+		$args = func_get_args();
+
+		return call_user_func_array( 'wfMessage', $args )->setContext( $this );
+	}
+}