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[mediawiki.git] / includes / auth / PrimaryAuthenticationProvider.php

<?php
/**
 * Primary 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 StatusValue;
use User;

/**
 * A primary authentication provider is responsible for associating the submitted
 * authentication data with a MediaWiki account.
 *
 * When multiple primary authentication providers are configured for a site, they
 * act as alternatives; the first one that recognizes the data will handle it,
 * and further primary providers are not called (although they all get a chance
 * to prevent actions).
 *
 * For login, the PrimaryAuthenticationProvider takes form data and determines
 * which authenticated user (if any) corresponds to that form data. It might
 * do this on the basis of a username and password in that data, or by
 * interacting with an external authentication service (e.g. using OpenID),
 * or by some other mechanism.
 *
 * (A PrimaryAuthenticationProvider would not be appropriate for something like
 * HTTP authentication, OAuth, or SSL client certificates where each HTTP
 * request contains all the information needed to identify the user. In that
 * case you'll want to be looking at a \MediaWiki\Session\SessionProvider
 * instead.)
 *
 * For account creation, the PrimaryAuthenticationProvider takes form data and
 * stores some authentication details which will allow it to verify a login by
 * that user in the future. This might for example involve saving it in the
 * database in a table that can be joined to the user table, or sending it to
 * some external service for account creation, or authenticating the user with
 * some remote service and then recording that the remote identity is linked to
 * the local account.
 * The creation of the local user (i.e. calling User::addToDatabase()) is handled
 * by AuthManager once the primary authentication provider returns a PASS
 * from begin/continueAccountCreation; do not try to do it yourself.
 *
 * For account linking, the PrimaryAuthenticationProvider verifies the user's
 * identity at some external service (typically by redirecting the user and
 * asking the external service to verify) and then records which local account
 * is linked to which remote accounts. It should keep track of this and be able
 * to enumerate linked accounts via getAuthenticationRequests(ACTION_REMOVE).
 *
 * This interface also provides methods for changing authentication data such
 * as passwords, and callbacks that are invoked after login / account creation
 * / account linking succeeded or failed.
 *
 * @ingroup Auth
 * @since 1.27
 * @see https://www.mediawiki.org/wiki/Manual:SessionManager_and_AuthManager
 */
interface PrimaryAuthenticationProvider extends AuthenticationProvider {
        /** Provider can create accounts */
        const TYPE_CREATE = 'create';
        /** Provider can link to existing accounts elsewhere */
        const TYPE_LINK = 'link';
        /** Provider cannot create or link to accounts */
        const TYPE_NONE = 'none';

        /**
         * {@inheritdoc}
         *
         * Of the requests returned by this method, exactly one should have
         * {@link AuthenticationRequest::$required} set to REQUIRED.
         */
        public function getAuthenticationRequests( $action, array $options );

        /**
         * Start an authentication flow
         *
         * @param AuthenticationRequest[] $reqs
         * @return AuthenticationResponse Expected responses:
         *  - PASS: The user is authenticated. Secondary providers will now run.
         *  - FAIL: The user is not authenticated. Fail the authentication process.
         *  - ABSTAIN: These $reqs are not handled. Some other primary provider may handle it.
         *  - UI: The $reqs are accepted, no other primary provider will run.
         *    Additional AuthenticationRequests are needed to complete the process.
         *  - REDIRECT: The $reqs are accepted, no other primary provider will run.
         *    Redirection to a third party is needed to complete the process.
         */
        public function beginPrimaryAuthentication( array $reqs );

        /**
         * Continue an authentication flow
         * @param AuthenticationRequest[] $reqs
         * @return AuthenticationResponse Expected responses:
         *  - PASS: The user is authenticated. Secondary providers will now run.
         *  - FAIL: The user is not authenticated. Fail the authentication process.
         *  - UI: Additional AuthenticationRequests are needed to complete the process.
         *  - REDIRECT: Redirection to a third party is needed to complete the process.
         */
        public function continuePrimaryAuthentication( array $reqs );

        /**
         * Post-login callback
         *
         * This will be called at the end of any login attempt, regardless of whether this provider was
         * the one that handled it. It will not be called for unfinished login attempts that fail by
         * the session timing out.
         *
         * @param User|null $user User that was attempted to be logged in, if known.
         *   This may become a "UserValue" in the future, or User may be refactored
         *   into such.
         * @param AuthenticationResponse $response Authentication response that will be returned
         *   (PASS or FAIL)
         */
        public function postAuthentication( $user, AuthenticationResponse $response );

        /**
         * Test whether the named user exists
         *
         * Single-sign-on providers can use this to reserve a username for autocreation.
         *
         * @param string $username MediaWiki username
         * @param int $flags Bitfield of User:READ_* constants
         * @return bool
         */
        public function testUserExists( $username, $flags = User::READ_NORMAL );

        /**
         * Test whether the named user can authenticate with this provider
         *
         * Should return true if the provider has any data for this user which can be used to
         * authenticate it, even if the user is temporarily prevented from authentication somehow.
         *
         * @param string $username MediaWiki username
         * @return bool
         */
        public function testUserCanAuthenticate( $username );

        /**
         * Normalize the username for authentication
         *
         * Any two inputs that would result in the same user being authenticated
         * should return the same string here, while inputs that would result in
         * different users should return different strings.
         *
         * If possible, the best thing to do here is to return the canonicalized
         * name of the local user account that would be used. If not, return
         * something that would be invalid as a local username (e.g. wrap an email
         * address in "<>", or append "#servicename" to the username passed to a
         * third-party service).
         *
         * If the provider doesn't use a username at all in its
         * AuthenticationRequests, return null. If the name is syntactically
         * invalid, it's probably best to return null.
         *
         * @param string $username
         * @return string|null
         */
        public function providerNormalizeUsername( $username );

        /**
         * Revoke the user's credentials
         *
         * This may cause the user to no longer exist for the provider, or the user
         * may continue to exist in a "disabled" state.
         *
         * The intention is that the named account will never again be usable for
         * normal login (i.e. there is no way to undo the revocation of access).
         *
         * @param string $username
         */
        public function providerRevokeAccessForUser( $username );

        /**
         * Determine whether a property can change
         * @see AuthManager::allowsPropertyChange()
         * @param string $property
         * @return bool
         */
        public function providerAllowsPropertyChange( $property );

        /**
         * Validate a change of authentication data (e.g. passwords)
         *
         * Return StatusValue::newGood( 'ignored' ) if you don't support this
         * AuthenticationRequest type.
         *
         * @param AuthenticationRequest $req
         * @param bool $checkData If false, $req hasn't been loaded from the
         *  submission so checks on user-submitted fields should be skipped.
         *  $req->username is considered user-submitted for this purpose, even
         *  if it cannot be changed via $req->loadFromSubmission.
         * @return StatusValue
         */
        public function providerAllowsAuthenticationDataChange(
                AuthenticationRequest $req, $checkData = true
        );

        /**
         * Change or remove authentication data (e.g. passwords)
         *
         * If $req was returned for AuthManager::ACTION_CHANGE, the corresponding
         * credentials should result in a successful login in the future.
         *
         * If $req was returned for AuthManager::ACTION_REMOVE, the corresponding
         * credentials should no longer result in a successful login.
         *
         * It can be assumed that providerAllowsAuthenticationDataChange with $checkData === true
         * was called before this, and passed. This method should never fail (other than throwing an
         * exception).
         *
         * @param AuthenticationRequest $req
         */
        public function providerChangeAuthenticationData( AuthenticationRequest $req );

        /**
         * Fetch the account-creation type
         * @return string One of the TYPE_* constants
         */
        public function accountCreationType();

        /**
         * Determine whether an account creation may begin
         *
         * Called from AuthManager::beginAccountCreation()
         *
         * @note No need to test if the account exists, AuthManager checks that
         * @param User $user User being created (not added to the database yet).
         *   This may become a "UserValue" in the future, or User may be refactored
         *   into such.
         * @param User $creator User doing the creation. This may become a
         *   "UserValue" in the future, or User may be refactored into such.
         * @param AuthenticationRequest[] $reqs
         * @return StatusValue
         */
        public function testForAccountCreation( $user, $creator, array $reqs );

        /**
         * Start an account creation flow
         * @param User $user User being created (not added to the database yet).
         *   This may become a "UserValue" in the future, or User may be refactored
         *   into such.
         * @param User $creator User doing the creation. This may become a
         *   "UserValue" in the future, or User may be refactored into such.
         * @param AuthenticationRequest[] $reqs
         * @return AuthenticationResponse Expected responses:
         *  - PASS: The user may be created. Secondary providers will now run.
         *  - FAIL: The user may not be created. Fail the creation process.
         *  - ABSTAIN: These $reqs are not handled. Some other primary provider may handle it.
         *  - UI: The $reqs are accepted, no other primary provider will run.
         *    Additional AuthenticationRequests are needed to complete the process.
         *  - REDIRECT: The $reqs are accepted, no other primary provider will run.
         *    Redirection to a third party is needed to complete the process.
         */
        public function beginPrimaryAccountCreation( $user, $creator, array $reqs );

        /**
         * Continue an account creation flow
         * @param User $user User being created (not added to the database yet).
         *   This may become a "UserValue" in the future, or User may be refactored
         *   into such.
         * @param User $creator User doing the creation. This may become a
         *   "UserValue" in the future, or User may be refactored into such.
         * @param AuthenticationRequest[] $reqs
         * @return AuthenticationResponse Expected responses:
         *  - PASS: The user may be created. Secondary providers will now run.
         *  - FAIL: The user may not be created. Fail the creation process.
         *  - UI: Additional AuthenticationRequests are needed to complete the process.
         *  - REDIRECT: Redirection to a third party is needed to complete the process.
         */
        public function continuePrimaryAccountCreation( $user, $creator, array $reqs );

        /**
         * Post-creation callback
         *
         * Called after the user is added to the database, before secondary
         * authentication providers are run. Only called if this provider was the one that issued
         * a PASS.
         *
         * @param User $user User being created (has been added to the database now).
         *   This may become a "UserValue" in the future, or User may be refactored
         *   into such.
         * @param User $creator User doing the creation. This may become a
         *   "UserValue" in the future, or User may be refactored into such.
         * @param AuthenticationResponse $response PASS response returned earlier
         * @return string|null 'newusers' log subtype to use for logging the
         *   account creation. If null, either 'create' or 'create2' will be used
         *   depending on $creator.
         */
        public function finishAccountCreation( $user, $creator, AuthenticationResponse $response );

        /**
         * Post-creation callback
         *
         * This will be called at the end of any account creation attempt, regardless of whether this
         * provider was the one that handled it. It will not be called if the account creation process
         * results in a session timeout (possibly after a successful user creation, while a secondary
         * provider is waiting for a response).
         *
         * @param User $user User that was attempted to be created.
         *   This may become a "UserValue" in the future, or User may be refactored
         *   into such.
         * @param User $creator User doing the creation. This may become a
         *   "UserValue" in the future, or User may be refactored into such.
         * @param AuthenticationResponse $response Authentication response that will be returned
         *   (PASS or FAIL)
         */
        public function postAccountCreation( $user, $creator, AuthenticationResponse $response );

        /**
         * Determine whether an account may be created
         *
         * @param User $user User being created (not added to the database yet).
         *   This may become a "UserValue" in the future, or User may be refactored
         *   into such.
         * @param bool|string $autocreate False if this is not an auto-creation, or
         *  the source of the auto-creation passed to AuthManager::autoCreateUser().
         * @param array $options
         *  - flags: (int) Bitfield of User:READ_* constants, default User::READ_NORMAL
         *  - creating: (bool) If false (or missing), this call is only testing if
         *    a user could be created. If set, this (non-autocreation) is for
         *    actually creating an account and will be followed by a call to
         *    testForAccountCreation(). In this case, the provider might return
         *    StatusValue::newGood() here and let the later call to
         *    testForAccountCreation() do a more thorough test.
         * @return StatusValue
         */
        public function testUserForCreation( $user, $autocreate, array $options = [] );

        /**
         * Post-auto-creation callback
         * @param User $user User being created (has been added to the database now).
         *   This may become a "UserValue" in the future, or User may be refactored
         *   into such.
         * @param string $source The source of the auto-creation passed to
         *  AuthManager::autoCreateUser().
         */
        public function autoCreatedAccount( $user, $source );

        /**
         * Start linking an account to an existing user
         * @param User $user User being linked.
         *   This may become a "UserValue" in the future, or User may be refactored
         *   into such.
         * @param AuthenticationRequest[] $reqs
         * @return AuthenticationResponse Expected responses:
         *  - PASS: The user is linked.
         *  - FAIL: The user is not linked. Fail the linking process.
         *  - ABSTAIN: These $reqs are not handled. Some other primary provider may handle it.
         *  - UI: The $reqs are accepted, no other primary provider will run.
         *    Additional AuthenticationRequests are needed to complete the process.
         *  - REDIRECT: The $reqs are accepted, no other primary provider will run.
         *    Redirection to a third party is needed to complete the process.
         */
        public function beginPrimaryAccountLink( $user, array $reqs );

        /**
         * Continue linking an account to an existing user
         * @param User $user User being linked.
         *   This may become a "UserValue" in the future, or User may be refactored
         *   into such.
         * @param AuthenticationRequest[] $reqs
         * @return AuthenticationResponse Expected responses:
         *  - PASS: The user is linked.
         *  - FAIL: The user is not linked. Fail the linking process.
         *  - UI: Additional AuthenticationRequests are needed to complete the process.
         *  - REDIRECT: Redirection to a third party is needed to complete the process.
         */
        public function continuePrimaryAccountLink( $user, array $reqs );

        /**
         * Post-link callback
         *
         * This will be called at the end of any account linking attempt, regardless of whether this
         * provider was the one that handled it.
         *
         * @param User $user User that was attempted to be linked.
         *   This may become a "UserValue" in the future, or User may be refactored
         *   into such.
         * @param AuthenticationResponse $response Authentication response that will be returned
         *   (PASS or FAIL)
         */
        public function postAccountLink( $user, AuthenticationResponse $response );

}