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diff --git a/www/wiki/includes/context/ContextSource.php b/www/wiki/includes/context/ContextSource.php
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+++ b/www/wiki/includes/context/ContextSource.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 Happy-melon
+ * @file
+ */
+use MediaWiki\MediaWikiServices;
+
+/**
+ * The simplest way of implementing IContextSource is to hold a RequestContext as a
+ * member variable and provide accessors to it.
+ *
+ * @since 1.18
+ */
+abstract class ContextSource implements IContextSource {
+	/**
+	 * @var IContextSource
+	 */
+	private $context;
+
+	/**
+	 * Get the base IContextSource object
+	 * @since 1.18
+	 * @return IContextSource
+	 */
+	public function getContext() {
+		if ( $this->context === null ) {
+			$class = static::class;
+			wfDebug( __METHOD__ . " ($class): called and \$context is null. " .
+				"Using RequestContext::getMain() for sanity\n" );
+			$this->context = RequestContext::getMain();
+		}
+
+		return $this->context;
+	}
+
+	/**
+	 * @since 1.18
+	 * @param IContextSource $context
+	 */
+	public function setContext( IContextSource $context ) {
+		$this->context = $context;
+	}
+
+	/**
+	 * @since 1.23
+	 * @return Config
+	 */
+	public function getConfig() {
+		return $this->getContext()->getConfig();
+	}
+
+	/**
+	 * @since 1.18
+	 * @return WebRequest
+	 */
+	public function getRequest() {
+		return $this->getContext()->getRequest();
+	}
+
+	/**
+	 * @since 1.18
+	 * @return Title|null
+	 */
+	public function getTitle() {
+		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() {
+		return $this->getContext()->canUseWikiPage();
+	}
+
+	/**
+	 * 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() {
+		return $this->getContext()->getWikiPage();
+	}
+
+	/**
+	 * @since 1.18
+	 * @return OutputPage
+	 */
+	public function getOutput() {
+		return $this->getContext()->getOutput();
+	}
+
+	/**
+	 * @since 1.18
+	 * @return User
+	 */
+	public function getUser() {
+		return $this->getContext()->getUser();
+	}
+
+	/**
+	 * @since 1.19
+	 * @return Language
+	 */
+	public function getLanguage() {
+		return $this->getContext()->getLanguage();
+	}
+
+	/**
+	 * @since 1.18
+	 * @return Skin
+	 */
+	public function getSkin() {
+		return $this->getContext()->getSkin();
+	}
+
+	/**
+	 * @since 1.27
+	 * @return Timing
+	 */
+	public function getTiming() {
+		return $this->getContext()->getTiming();
+	}
+
+	/**
+	 * @deprecated since 1.27 use a StatsdDataFactory from MediaWikiServices (preferably injected)
+	 *
+	 * @since 1.25
+	 * @return IBufferingStatsdDataFactory
+	 */
+	public function getStats() {
+		return MediaWikiServices::getInstance()->getStatsdDataFactory();
+	}
+
+	/**
+	 * Get a Message object with context set
+	 * Parameters are the same as wfMessage()
+	 *
+	 * @since 1.18
+	 * @param string|string[]|MessageSpecifier $key Message key, or array of keys,
+	 *   or a MessageSpecifier.
+	 * @param mixed $args,...
+	 * @return Message
+	 */
+	public function msg( $key /* $args */ ) {
+		$args = func_get_args();
+
+		return call_user_func_array( [ $this->getContext(), 'msg' ], $args );
+	}
+
+	/**
+	 * Export the resolved user IP, HTTP headers, user ID, and session ID.
+	 * The result will be reasonably sized to allow for serialization.
+	 *
+	 * @return array
+	 * @since 1.21
+	 */
+	public function exportSession() {
+		return $this->getContext()->exportSession();
+	}
+}