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diff --git a/www/wiki/includes/auth/AbstractSecondaryAuthenticationProvider.php b/www/wiki/includes/auth/AbstractSecondaryAuthenticationProvider.php
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+++ b/www/wiki/includes/auth/AbstractSecondaryAuthenticationProvider.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
+ *
+ * @file
+ * @ingroup Auth
+ */
+
+namespace MediaWiki\Auth;
+
+/**
+ * A base class that implements some of the boilerplate for a SecondaryAuthenticationProvider
+ *
+ * @ingroup Auth
+ * @since 1.27
+ */
+abstract class AbstractSecondaryAuthenticationProvider extends AbstractAuthenticationProvider
+	implements SecondaryAuthenticationProvider
+{
+
+	public function continueSecondaryAuthentication( $user, array $reqs ) {
+		throw new \BadMethodCallException( __METHOD__ . ' is not implemented.' );
+	}
+
+	public function postAuthentication( $user, AuthenticationResponse $response ) {
+	}
+
+	public function providerAllowsPropertyChange( $property ) {
+		return true;
+	}
+
+	/**
+	 * @inheritDoc
+	 * @note Reimplement this if self::getAuthenticationRequests( AuthManager::ACTION_REMOVE )
+	 *  doesn't return requests that will revoke all access for the user.
+	 */
+	public function providerRevokeAccessForUser( $username ) {
+		$reqs = $this->getAuthenticationRequests(
+			AuthManager::ACTION_REMOVE, [ 'username' => $username ]
+		);
+		foreach ( $reqs as $req ) {
+			$req->username = $username;
+			$this->providerChangeAuthenticationData( $req );
+		}
+	}
+
+	public function providerAllowsAuthenticationDataChange(
+		AuthenticationRequest $req, $checkData = true
+	) {
+		return \StatusValue::newGood( 'ignored' );
+	}
+
+	public function providerChangeAuthenticationData( AuthenticationRequest $req ) {
+	}
+
+	public function testForAccountCreation( $user, $creator, array $reqs ) {
+		return \StatusValue::newGood();
+	}
+
+	public function continueSecondaryAccountCreation( $user, $creator, array $reqs ) {
+		throw new \BadMethodCallException( __METHOD__ . ' is not implemented.' );
+	}
+
+	public function postAccountCreation( $user, $creator, AuthenticationResponse $response ) {
+	}
+
+	public function testUserForCreation( $user, $autocreate, array $options = [] ) {
+		return \StatusValue::newGood();
+	}
+
+	public function autoCreatedAccount( $user, $source ) {
+	}
+}