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<?php
/**
* Authentication request value object
*
* 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 MediaWiki\Language\RawMessage;
use MediaWiki\Message\Message;
use UnexpectedValueException;
/**
* This is a value object for authentication requests.
*
* An AuthenticationRequest represents a set of form fields that are needed on
* and provided from a login, account creation, password change or similar form. Form fields can
* be shared by multiple AuthenticationRequests (see {@see ::mergeFieldInfo()}).
*
* Authentication providers that expect user input need to implement one or more subclasses
* of this class and return them from AuthenticationProvider::getAuthenticationRequests().
* A typical subclass would override getFieldInfo() and set $required.
*
* @stable to extend
* @ingroup Auth
* @since 1.27
*/
abstract class AuthenticationRequest {
/** Indicates that the request is not required for authentication to proceed. */
public const OPTIONAL = 0;
/**
* Indicates that the request is required for authentication to proceed.
* This will only be used for UI purposes; it is the authentication providers'
* responsibility to verify that all required requests are present.
*/
public const REQUIRED = 1;
/**
* Indicates that the request is required by a primary authentication
* provider. Since the user can choose which primary to authenticate with,
* the request might or might not end up being actually required.
*/
public const PRIMARY_REQUIRED = 2;
/**
* The AuthManager::ACTION_* constant this request was created to be used for.
* Usually set by AuthManager. The *_CONTINUE constants are not used here,
* the corresponding "begin" constant is used instead.
*
* @var string|null
*/
public $action = null;
/**
* Whether the authentication request is required (for login, continue, and link
* actions). Setting this to optional is roughly equivalent to setting the 'optional' flag for
* all fields in the field info.
*
* Set this to self::OPTIONAL or self::REQUIRED. When coming from a primary provider,
* self::REQUIRED will be automatically modified to self::PRIMARY_REQUIRED.
*
* @var int
*/
public $required = self::REQUIRED;
/**
* Return-to URL, in case of a REDIRECT AuthenticationResponse. Set by AuthManager.
* @var string|null
*/
public $returnToUrl = null;
/**
* Username. Usually set by AuthManager. See AuthenticationProvider::getAuthenticationRequests()
* for details of what this means and how it behaves.
*
* Often this doubles as a normal field (ie. getFieldInfo() has a 'username' key).
*
* @var string|null
*/
public $username = null;
/**
* Supply a unique key for deduplication
*
* When the AuthenticationRequests instances returned by the providers are
* merged, the value returned here is used for keeping only one copy of
* duplicate requests.
*
* Subclasses should override this if multiple distinct instances would
* make sense, i.e. the request class has internal state of some sort.
*
* This value might be exposed to the user in web forms so it should not
* contain private information.
*
* @stable to override
* @return string
*/
public function getUniqueId() {
return get_called_class();
}
/**
* Fetch input field info. This will be used in the AuthManager APIs and web UIs to define
* API input parameters / form fields and to process the submitted data.
*
* The field info is an associative array mapping field names to info
* arrays. The info arrays have the following keys:
* - type: (string) Type of input. Types and equivalent HTML widgets are:
* - string: <input type="text">
* - password: <input type="password">
* - select: <select>
* - checkbox: <input type="checkbox">
* - multiselect: More a grid of checkboxes than <select multi>
* - button: <input type="submit"> (uses 'label' as button text)
* - hidden: Not visible to the user, but needs to be preserved for the next request
* - null: No widget, just display the 'label' message.
* - options: (array) Maps option values to Messages for the
* 'select' and 'multiselect' types.
* - value: (string) Value (for 'null' and 'hidden') or default value (for other types).
* - label: (Message) Text suitable for a label in an HTML form
* - help: (Message) Text suitable as a description of what the field is. Used in API
* documentation. To add a help text to the web UI, use the AuthChangeFormFields hook.
* - optional: (bool) If set and truthy, the field may be left empty
* - sensitive: (bool) If set and truthy, the field is considered sensitive. Code using the
* request should avoid exposing the value of the field.
* - skippable: (bool) If set and truthy, the client is free to hide this
* field from the user to streamline the workflow. If all fields are
* skippable (except possibly a single button), no user interaction is
* required at all.
*
* All AuthenticationRequests are populated from the same data, so most of the time you'll
* want to prefix fields names with something unique to the extension/provider (although
* in some cases sharing the field with other requests is the right thing to do, e.g. for
* a 'password' field). When multiple fields have the same name, they will be merged (see
* AuthenticationRequests::mergeFieldInfo).
* Typically, AuthenticationRequest subclasses define public properties with names matching
* the field info keys, and those fields will be populated from the submitted data. More
* complex behavior can be implemented by overriding {@see ::loadFromSubmission()}.
*
* @return array As above
* @phan-return array<string,array{type:string,options?:array,value?:string,label:Message,help:Message,optional?:bool,sensitive?:bool,skippable?:bool}>
*/
abstract public function getFieldInfo();
/**
* Returns metadata about this request.
*
* This is mainly for the benefit of API clients which need more detailed render hints
* than what's available through getFieldInfo(). Semantics are unspecified and left to the
* individual subclasses, but the contents of the array should be primitive types so that they
* can be transformed into JSON or similar formats.
*
* @stable to override
* @return array A (possibly nested) array with primitive types
*/
public function getMetadata() {
return [];
}
/**
* Initialize form submitted form data.
*
* The default behavior is to check for each key of self::getFieldInfo()
* in the submitted data, and copy the value - after type-appropriate transformations -
* to $this->$key. Most subclasses won't need to override this; if you do override it,
* make sure to always return false if self::getFieldInfo() returns an empty array.
*
* @stable to override
* @param array $data Submitted data as an associative array (keys will correspond
* to getFieldInfo())
* @return bool Whether the request data was successfully loaded
*/
public function loadFromSubmission( array $data ) {
$fields = array_filter( $this->getFieldInfo(), static function ( $info ) {
return $info['type'] !== 'null';
} );
if ( !$fields ) {
return false;
}
foreach ( $fields as $field => $info ) {
// Checkboxes and buttons are special. Depending on the method used
// to populate $data, they might be unset meaning false or they
// might be boolean. Further, image buttons might submit the
// coordinates of the click rather than the expected value.
if ( $info['type'] === 'checkbox' || $info['type'] === 'button' ) {
$this->$field = ( isset( $data[$field] ) && $data[$field] !== false )
|| ( isset( $data["{$field}_x"] ) && $data["{$field}_x"] !== false );
if ( !$this->$field && empty( $info['optional'] ) ) {
return false;
}
continue;
}
// Multiselect are too, slightly
if ( !isset( $data[$field] ) && $info['type'] === 'multiselect' ) {
$data[$field] = [];
}
if ( !isset( $data[$field] ) ) {
return false;
}
if ( $data[$field] === '' || $data[$field] === [] ) {
if ( empty( $info['optional'] ) ) {
return false;
}
} else {
switch ( $info['type'] ) {
case 'select':
if ( !isset( $info['options'][$data[$field]] ) ) {
return false;
}
break;
case 'multiselect':
$data[$field] = (array)$data[$field];
// @phan-suppress-next-line PhanTypePossiblyInvalidDimOffset required for multiselect
$allowed = array_keys( $info['options'] );
if ( array_diff( $data[$field], $allowed ) !== [] ) {
return false;
}
break;
}
}
$this->$field = $data[$field];
}
return true;
}
/**
* Describe the credentials represented by this request
*
* This is used on requests returned by
* AuthenticationProvider::getAuthenticationRequests() for ACTION_LINK
* and ACTION_REMOVE and for requests returned in
* AuthenticationResponse::$linkRequest to create useful user interfaces.
*
* @stable to override
*
* @return Message[] with the following keys:
* - provider: A Message identifying the service that provides
* the credentials, e.g. the name of the third party authentication
* service.
* - account: A Message identifying the credentials themselves,
* e.g. the email address used with the third party authentication
* service.
*/
public function describeCredentials() {
return [
'provider' => new RawMessage( '$1', [ get_called_class() ] ),
'account' => new RawMessage( '$1', [ $this->getUniqueId() ] ),
];
}
/**
* Update a set of requests with form submit data, discarding ones that fail
*
* @param AuthenticationRequest[] $reqs
* @param array $data
* @return AuthenticationRequest[]
*/
public static function loadRequestsFromSubmission( array $reqs, array $data ) {
$result = [];
foreach ( $reqs as $req ) {
if ( $req->loadFromSubmission( $data ) ) {
$result[] = $req;
}
}
return $result;
}
/**
* Select a request by class name.
*
* @phan-template T
* @param AuthenticationRequest[] $reqs
* @param string $class Class name
* @phan-param class-string<T> $class
* @param bool $allowSubclasses If true, also returns any request that's a subclass of the given
* class.
* @return AuthenticationRequest|null Returns null if there is not exactly
* one matching request.
* @phan-return T|null
*/
public static function getRequestByClass( array $reqs, $class, $allowSubclasses = false ) {
$requests = array_filter( $reqs, static function ( $req ) use ( $class, $allowSubclasses ) {
if ( $allowSubclasses ) {
return is_a( $req, $class, false );
} else {
return get_class( $req ) === $class;
}
} );
// @phan-suppress-next-line PhanTypeMismatchReturn False positive
return count( $requests ) === 1 ? reset( $requests ) : null;
}
/**
* Get the username from the set of requests
*
* Only considers requests that have a "username" field.
*
* @param AuthenticationRequest[] $reqs
* @return string|null
* @throws UnexpectedValueException If multiple different usernames are present.
*/
public static function getUsernameFromRequests( array $reqs ) {
$username = null;
$otherClass = null;
foreach ( $reqs as $req ) {
$info = $req->getFieldInfo();
if ( $info && array_key_exists( 'username', $info ) && $req->username !== null ) {
if ( $username === null ) {
$username = $req->username;
$otherClass = get_class( $req );
} elseif ( $username !== $req->username ) {
$requestClass = get_class( $req );
throw new UnexpectedValueException( "Conflicting username fields: \"{$req->username}\" from "
// @phan-suppress-next-line PhanTypeSuspiciousStringExpression $otherClass always set
. "$requestClass::\$username vs. \"$username\" from $otherClass::\$username" );
}
}
}
return $username;
}
/**
* Merge the output of multiple AuthenticationRequest::getFieldInfo() calls.
* @param AuthenticationRequest[] $reqs
* @return array Field info in the same format as getFieldInfo().
* @throws UnexpectedValueException If the requests include fields with the same name but
* incompatible definitions (e.g. different field types).
*/
public static function mergeFieldInfo( array $reqs ) {
$merged = [];
// fields that are required by some primary providers but not others are not actually required
$sharedRequiredPrimaryFields = null;
foreach ( $reqs as $req ) {
if ( $req->required !== self::PRIMARY_REQUIRED ) {
continue;
}
$required = [];
foreach ( $req->getFieldInfo() as $fieldName => $options ) {
if ( empty( $options['optional'] ) ) {
$required[] = $fieldName;
}
}
if ( $sharedRequiredPrimaryFields === null ) {
$sharedRequiredPrimaryFields = $required;
} else {
$sharedRequiredPrimaryFields = array_intersect( $sharedRequiredPrimaryFields, $required );
}
}
foreach ( $reqs as $req ) {
$info = $req->getFieldInfo();
if ( !$info ) {
continue;
}
foreach ( $info as $name => $options ) {
if (
// If the request isn't required, its fields aren't required either.
$req->required === self::OPTIONAL
// If there is a primary not requiring this field, no matter how many others do,
// authentication can proceed without it.
|| ( $req->required === self::PRIMARY_REQUIRED
// @phan-suppress-next-line PhanTypeMismatchArgumentNullableInternal False positive
&& !in_array( $name, $sharedRequiredPrimaryFields, true ) )
) {
$options['optional'] = true;
} else {
$options['optional'] = !empty( $options['optional'] );
}
$options['sensitive'] = !empty( $options['sensitive'] );
$type = $options['type'];
if ( !array_key_exists( $name, $merged ) ) {
$merged[$name] = $options;
} elseif ( $merged[$name]['type'] !== $type ) {
throw new UnexpectedValueException( "Field type conflict for \"$name\", " .
"\"{$merged[$name]['type']}\" vs \"$type\""
);
} else {
if ( isset( $options['options'] ) ) {
if ( isset( $merged[$name]['options'] ) ) {
$merged[$name]['options'] += $options['options'];
} else {
// @codeCoverageIgnoreStart
$merged[$name]['options'] = $options['options'];
// @codeCoverageIgnoreEnd
}
}
$merged[$name]['optional'] = $merged[$name]['optional'] && $options['optional'];
$merged[$name]['sensitive'] = $merged[$name]['sensitive'] || $options['sensitive'];
// No way to merge 'value', 'image', 'help', or 'label', so just use
// the value from the first request.
}
}
}
return $merged;
}
/**
* Implementing this mainly for use from the unit tests.
* @param array $data
* @return AuthenticationRequest
*/
public static function __set_state( $data ) {
// @phan-suppress-next-line PhanTypeInstantiateAbstractStatic
$ret = new static();
foreach ( $data as $k => $v ) {
$ret->$k = $v;
}
return $ret;
}
}