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diff --git a/www/wiki/includes/auth/AuthenticationProvider.php b/www/wiki/includes/auth/AuthenticationProvider.php
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+<?php
+/**
+ * Authentication provider interface
+ *
+ * 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;
+
+use Config;
+use Psr\Log\LoggerAwareInterface;
+
+/**
+ * An AuthenticationProvider is used by AuthManager when authenticating users.
+ *
+ * This interface should not be implemented directly; use one of its children.
+ *
+ * Authentication providers can be registered via $wgAuthManagerAutoConfig.
+ *
+ * @ingroup Auth
+ * @since 1.27
+ */
+interface AuthenticationProvider extends LoggerAwareInterface {
+
+	/**
+	 * Set AuthManager
+	 * @param AuthManager $manager
+	 */
+	public function setManager( AuthManager $manager );
+
+	/**
+	 * Set configuration
+	 * @param Config $config
+	 */
+	public function setConfig( Config $config );
+
+	/**
+	 * Return a unique identifier for this instance
+	 *
+	 * This must be the same across requests. If multiple instances return the
+	 * same ID, exceptions will be thrown from AuthManager.
+	 *
+	 * @return string
+	 */
+	public function getUniqueId();
+
+	/**
+	 * Return the applicable list of AuthenticationRequests
+	 *
+	 * Possible values for $action depend on whether the implementing class is
+	 * also a PreAuthenticationProvider, PrimaryAuthenticationProvider, or
+	 * SecondaryAuthenticationProvider.
+	 *  - ACTION_LOGIN: Valid for passing to beginAuthentication. Called on all
+	 *    providers.
+	 *  - ACTION_CREATE: Valid for passing to beginAccountCreation. Called on
+	 *    all providers.
+	 *  - ACTION_LINK: Valid for passing to beginAccountLink. Called on linking
+	 *    primary providers only.
+	 *  - ACTION_CHANGE: Valid for passing to AuthManager::changeAuthenticationData
+	 *    to change credentials. Called on primary and secondary providers.
+	 *  - ACTION_REMOVE: Valid for passing to AuthManager::changeAuthenticationData
+	 *    to remove credentials. Must work without additional user input (i.e.
+	 *    without calling loadFromSubmission). Called on primary and secondary
+	 *    providers.
+	 *
+	 * @see AuthManager::getAuthenticationRequests()
+	 * @param string $action
+	 * @param array $options Options are:
+	 *  - username: User name related to the action, or null/unset if anon.
+	 *    - ACTION_LOGIN: The currently logged-in user, if any.
+	 *    - ACTION_CREATE: The account creator, if non-anonymous.
+	 *    - ACTION_LINK: The local user being linked to.
+	 *    - ACTION_CHANGE: The user having data changed.
+	 *    - ACTION_REMOVE: The user having data removed.
+	 *    If you leave the username property of the returned requests empty, this
+	 *    will automatically be copied there (except for ACTION_CREATE where it
+	 *    wouldn't really make sense).
+	 * @return AuthenticationRequest[]
+	 */
+	public function getAuthenticationRequests( $action, array $options );
+
+}