includes/specialpage/AuthManagerSpecialPage.php

   1 <?php
   2
   3 use MediaWiki\Auth\AuthenticationRequest;
   4 use MediaWiki\Auth\AuthenticationResponse;
   5 use MediaWiki\Auth\AuthManager;
   6 use MediaWiki\Logger\LoggerFactory;
   7 use MediaWiki\Session\SessionManager;
   8 use MediaWiki\Session\Token;
   9
  10 /**
  11  * A special page subclass for authentication-related special pages. It generates a form from
  12  * a set of AuthenticationRequest objects, submits the result to AuthManager and
  13  * partially handles the response.
  14  */
  15 abstract class AuthManagerSpecialPage extends SpecialPage {
  16         /** @var string[] The list of actions this special page deals with. Subclasses should override
  17          * this. */
  18         protected static $allowedActions = [
  19                 AuthManager::ACTION_LOGIN, AuthManager::ACTION_LOGIN_CONTINUE,
  20                 AuthManager::ACTION_CREATE, AuthManager::ACTION_CREATE_CONTINUE,
  21                 AuthManager::ACTION_LINK, AuthManager::ACTION_LINK_CONTINUE,
  22                 AuthManager::ACTION_CHANGE, AuthManager::ACTION_REMOVE, AuthManager::ACTION_UNLINK,
  23         ];
  24
  25         /** @var array Customized messages */
  26         protected static $messages = [];
  27
  28         /** @var string one of the AuthManager::ACTION_* constants. */
  29         protected $authAction;
  30
  31         /** @var AuthenticationRequest[] */
  32         protected $authRequests;
  33
  34         /** @var string Subpage of the special page. */
  35         protected $subPage;
  36
  37         /** @var bool True if the current request is a result of returning from a redirect flow. */
  38         protected $isReturn;
  39
  40         /** @var WebRequest|null If set, will be used instead of the real request. Used for redirection. */
  41         protected $savedRequest;
  42
  43         /**
  44          * Change the form descriptor that determines how a field will look in the authentication form.
  45          * Called from fieldInfoToFormDescriptor().
  46          * @param AuthenticationRequest[] $requests
  47          * @param string $fieldInfo Field information array (union of all
  48          *    AuthenticationRequest::getFieldInfo() responses).
  49          * @param array $formDescriptor HTMLForm descriptor. The special key 'weight' can be set to
  50          *    change the order of the fields.
  51          * @param string $action Authentication type (one of the AuthManager::ACTION_* constants)
  52          * @return bool
  53          */
  54         public function onAuthChangeFormFields(
  55                 array $requests, array $fieldInfo, array &$formDescriptor, $action
  56         ) {
  57                 return true;
  58         }
  59
  60         protected function getLoginSecurityLevel() {
  61                 return $this->getName();
  62         }
  63
  64         public function getRequest() {
  65                 return $this->savedRequest ?: $this->getContext()->getRequest();
  66         }
  67
  68         /**
  69          * Override the POST data, GET data from the real request is preserved.
  70          *
  71          * Used to preserve POST data over a HTTP redirect.
  72          *
  73          * @param array $data
  74          * @param bool $wasPosted
  75          */
  76         protected function setRequest( array $data, $wasPosted = null ) {
  77                 $request = $this->getContext()->getRequest();
  78                 if ( $wasPosted === null ) {
  79                         $wasPosted = $request->wasPosted();
  80                 }
  81                 $this->savedRequest = new DerivativeRequest( $request, $data + $request->getQueryValues(),
  82                         $wasPosted );
  83         }
  84
  85         protected function beforeExecute( $subPage ) {
  86                 $this->getOutput()->disallowUserJs();
  87
  88                 return $this->handleReturnBeforeExecute( $subPage )
  89                         && $this->handleReauthBeforeExecute( $subPage );
  90         }
  91
  92         /**
  93          * Handle redirection from the /return subpage.
  94          *
  95          * This is used in the redirect flow where we need
  96          * to be able to process data that was sent via a GET request. We set the /return subpage as
  97          * the reentry point so we know we need to treat GET as POST, but we don't want to handle all
  98          * future GETs as POSTs so we need to normalize the URL. (Also we don't want to show any
  99          * received parameters around in the URL; they are ugly and might be sensitive.)
 100          *
 101          * Thus when on the /return subpage, we stash the request data in the session, redirect, then
 102          * use the session to detect that we have been redirected, recover the data and replace the
 103          * real WebRequest with a fake one that contains the saved data.
 104          *
 105          * @param string $subPage
 106          * @return bool False if execution should be stopped.
 107          */
 108         protected function handleReturnBeforeExecute( $subPage ) {
 109                 $authManager = AuthManager::singleton();
 110                 $key = 'AuthManagerSpecialPage:return:' . $this->getName();
 111
 112                 if ( $subPage === 'return' ) {
 113                         $this->loadAuth( $subPage );
 114                         $preservedParams = $this->getPreservedParams( false );
 115
 116                         // FIXME save POST values only from request
 117                         $authData = array_diff_key( $this->getRequest()->getValues(),
 118                                 $preservedParams, [ 'title' => 1 ] );
 119                         $authManager->setAuthenticationSessionData( $key, $authData );
 120
 121                         $url = $this->getPageTitle()->getFullURL( $preservedParams, false, PROTO_HTTPS );
 122                         $this->getOutput()->redirect( $url );
 123                         return false;
 124                 }
 125
 126                 $authData = $authManager->getAuthenticationSessionData( $key );
 127                 if ( $authData ) {
 128                         $authManager->removeAuthenticationSessionData( $key );
 129                         $this->isReturn = true;
 130                         $this->setRequest( $authData, true );
 131                 }
 132
 133                 return true;
 134         }
 135
 136         /**
 137          * Handle redirection when the user needs to (re)authenticate.
 138          *
 139          * Send the user to the login form if needed; in case the request was a POST, stash in the
 140          * session and simulate it once the user gets back.
 141          *
 142          * @param string $subPage
 143          * @return bool False if execution should be stopped.
 144          * @throws ErrorPageError When the user is not allowed to use this page.
 145          */
 146         protected function handleReauthBeforeExecute( $subPage ) {
 147                 $authManager = AuthManager::singleton();
 148                 $request = $this->getRequest();
 149                 $key = 'AuthManagerSpecialPage:reauth:' . $this->getName();
 150
 151                 $securityLevel = $this->getLoginSecurityLevel();
 152                 if ( $securityLevel ) {
 153                         $securityStatus = AuthManager::singleton()
 154                                 ->securitySensitiveOperationStatus( $securityLevel );
 155                         if ( $securityStatus === AuthManager::SEC_REAUTH ) {
 156                                 $queryParams = array_diff_key( $request->getQueryValues(), [ 'title' => true ] );
 157
 158                                 if ( $request->wasPosted() ) {
 159                                         // unique ID in case the same special page is open in multiple browser tabs
 160                                         $uniqueId = MWCryptRand::generateHex( 6 );
 161                                         $key = $key . ':' . $uniqueId;
 162
 163                                         $queryParams = [ 'authUniqueId' => $uniqueId ] + $queryParams;
 164                                         $authData = array_diff_key( $request->getValues(),
 165                                                         $this->getPreservedParams( false ), [ 'title' => 1 ] );
 166                                         $authManager->setAuthenticationSessionData( $key, $authData );
 167                                 }
 168
 169                                 $title = SpecialPage::getTitleFor( 'Userlogin' );
 170                                 $url = $title->getFullURL( [
 171                                         'returnto' => $this->getFullTitle()->getPrefixedDBkey(),
 172                                         'returntoquery' => wfArrayToCgi( $queryParams ),
 173                                         'force' => $securityLevel,
 174                                 ], false, PROTO_HTTPS );
 175
 176                                 $this->getOutput()->redirect( $url );
 177                                 return false;
 178                         } elseif ( $securityStatus !== AuthManager::SEC_OK ) {
 179                                 throw new ErrorPageError( 'cannotauth-not-allowed-title', 'cannotauth-not-allowed' );
 180                         }
 181                 }
 182
 183                 $uniqueId = $request->getVal( 'authUniqueId' );
 184                 if ( $uniqueId ) {
 185                         $key = $key . ':' . $uniqueId;
 186                         $authData = $authManager->getAuthenticationSessionData( $key );
 187                         if ( $authData ) {
 188                                 $authManager->removeAuthenticationSessionData( $key );
 189                                 $this->setRequest( $authData, true );
 190                         }
 191                 }
 192
 193                 return true;
 194         }
 195
 196         /**
 197          * Get the default action for this special page, if none is given via URL/POST data.
 198          * Subclasses should override this (or override loadAuth() so this is never called).
 199          * @param string $subPage Subpage of the special page.
 200          * @return string an AuthManager::ACTION_* constant.
 201          */
 202         protected function getDefaultAction( $subPage ) {
 203                 throw new BadMethodCallException( 'Subclass did not implement getDefaultAction' );
 204         }
 205
 206         /**
 207          * Return custom message key.
 208          * Allows subclasses to customize messages.
 209          * @return string
 210          */
 211         protected function messageKey( $defaultKey ) {
 212                 return array_key_exists( $defaultKey, static::$messages )
 213                         ? static::$messages[$defaultKey] : $defaultKey;
 214         }
 215
 216         /**
 217          * Allows blacklisting certain request types.
 218          * @return array A list of AuthenticationRequest subclass names
 219          */
 220         protected function getRequestBlacklist() {
 221                 return [];
 222         }
 223
 224         /**
 225          * Load or initialize $authAction, $authRequests and $subPage.
 226          * Subclasses should call this from execute() or otherwise ensure the variables are initialized.
 227          * @param string $subPage Subpage of the special page.
 228          * @param string $authAction Override auth action specified in request (this is useful
 229          *    when the form needs to be changed from <action> to <action>_CONTINUE after a successful
 230          *    authentication step)
 231          * @param bool $reset Regenerate the requests even if a cached version is available
 232          */
 233         protected function loadAuth( $subPage, $authAction = null, $reset = false ) {
 234                 // Do not load if already loaded, to cut down on the number of getAuthenticationRequests
 235                 // calls. This is important for requests which have hidden information so any
 236                 // getAuthenticationRequests call would mean putting data into some cache.
 237                 if (
 238                         !$reset && $this->subPage === $subPage && $this->authAction
 239                         && ( !$authAction || $authAction === $this->authAction )
 240                 ) {
 241                         return;
 242                 }
 243
 244                 $request = $this->getRequest();
 245                 $this->subPage = $subPage;
 246                 $this->authAction = $authAction ?: $request->getText( 'authAction' );
 247                 if ( !in_array( $this->authAction, static::$allowedActions, true ) ) {
 248                         $this->authAction = $this->getDefaultAction( $subPage );
 249                         if ( $request->wasPosted() ) {
 250                                 $continueAction = $this->getContinueAction( $this->authAction );
 251                                 if ( in_array( $continueAction, static::$allowedActions, true ) ) {
 252                                         $this->authAction = $continueAction;
 253                                 }
 254                         }
 255                 }
 256
 257                 $allReqs = AuthManager::singleton()->getAuthenticationRequests(
 258                         $this->authAction, $this->getUser() );
 259                 $this->authRequests = array_filter( $allReqs, function ( $req ) use ( $subPage ) {
 260                         return !in_array( get_class( $req ), $this->getRequestBlacklist(), true );
 261                 } );
 262         }
 263
 264         /**
 265          * Returns true if this is not the first step of the authentication.
 266          * @return bool
 267          */
 268         protected function isContinued() {
 269                 return in_array( $this->authAction, [
 270                         AuthManager::ACTION_LOGIN_CONTINUE,
 271                         AuthManager::ACTION_CREATE_CONTINUE,
 272                         AuthManager::ACTION_LINK_CONTINUE,
 273                 ], true );
 274         }
 275
 276         /**
 277          * Gets the _CONTINUE version of an action.
 278          * @param string $action An AuthManager::ACTION_* constant.
 279          * @return string An AuthManager::ACTION_*_CONTINUE constant.
 280          */
 281         protected function getContinueAction( $action ) {
 282                 switch ( $action ) {
 283                         case AuthManager::ACTION_LOGIN:
 284                                 $action = AuthManager::ACTION_LOGIN_CONTINUE;
 285                                 break;
 286                         case AuthManager::ACTION_CREATE:
 287                                 $action = AuthManager::ACTION_CREATE_CONTINUE;
 288                                 break;
 289                         case AuthManager::ACTION_LINK:
 290                                 $action = AuthManager::ACTION_LINK_CONTINUE;
 291                                 break;
 292                 }
 293                 return $action;
 294         }
 295
 296         /**
 297          * Checks whether AuthManager is ready to perform the action.
 298          * ACTION_CHANGE needs special verification (AuthManager::allowsAuthenticationData*) which is
 299          * the caller's responsibility.
 300          * @param string $action One of the AuthManager::ACTION_* constants in static::$allowedActions
 301          * @return bool
 302          * @throws LogicException if $action is invalid
 303          */
 304         protected function isActionAllowed( $action ) {
 305                 $authManager = AuthManager::singleton();
 306                 if ( !in_array( $action, static::$allowedActions, true ) ) {
 307                         throw new InvalidArgumentException( 'invalid action: ' . $action );
 308                 }
 309
 310                 // calling getAuthenticationRequests can be expensive, avoid if possible
 311                 $requests = ( $action === $this->authAction ) ? $this->authRequests
 312                         : $authManager->getAuthenticationRequests( $action );
 313                 if ( !$requests ) {
 314                         // no provider supports this action in the current state
 315                         return false;
 316                 }
 317
 318                 switch ( $action ) {
 319                         case AuthManager::ACTION_LOGIN:
 320                         case AuthManager::ACTION_LOGIN_CONTINUE:
 321                                 return $authManager->canAuthenticateNow();
 322                         case AuthManager::ACTION_CREATE:
 323                         case AuthManager::ACTION_CREATE_CONTINUE:
 324                                 return $authManager->canCreateAccounts();
 325                         case AuthManager::ACTION_LINK:
 326                         case AuthManager::ACTION_LINK_CONTINUE:
 327                                 return $authManager->canLinkAccounts();
 328                         case AuthManager::ACTION_CHANGE:
 329                         case AuthManager::ACTION_REMOVE:
 330                         case AuthManager::ACTION_UNLINK:
 331                                 return true;
 332                         default:
 333                                 // should never reach here but makes static code analyzers happy
 334                                 throw new InvalidArgumentException( 'invalid action: ' . $action );
 335                 }
 336         }
 337
 338         /**
 339          * @param string $action One of the AuthManager::ACTION_* constants
 340          * @param AuthenticationRequest[] $requests
 341          * @return AuthenticationResponse
 342          * @throws LogicException if $action is invalid
 343          */
 344         protected function performAuthenticationStep( $action, array $requests ) {
 345                 if ( !in_array( $action, static::$allowedActions, true ) ) {
 346                         throw new InvalidArgumentException( 'invalid action: ' . $action );
 347                 }
 348
 349                 $authManager = AuthManager::singleton();
 350                 $returnToUrl = $this->getPageTitle( 'return' )
 351                         ->getFullURL( $this->getPreservedParams( true ), false, PROTO_HTTPS );
 352
 353                 switch ( $action ) {
 354                         case AuthManager::ACTION_LOGIN:
 355                                 return $authManager->beginAuthentication( $requests, $returnToUrl );
 356                         case AuthManager::ACTION_LOGIN_CONTINUE:
 357                                 return $authManager->continueAuthentication( $requests );
 358                         case AuthManager::ACTION_CREATE:
 359                                 return $authManager->beginAccountCreation( $this->getUser(), $requests,
 360                                         $returnToUrl );
 361                         case AuthManager::ACTION_CREATE_CONTINUE:
 362                                 return $authManager->continueAccountCreation( $requests );
 363                         case AuthManager::ACTION_LINK:
 364                                 return $authManager->beginAccountLink( $this->getUser(), $requests, $returnToUrl );
 365                         case AuthManager::ACTION_LINK_CONTINUE:
 366                                 return $authManager->continueAccountLink( $requests );
 367                         case AuthManager::ACTION_CHANGE:
 368                         case AuthManager::ACTION_REMOVE:
 369                         case AuthManager::ACTION_UNLINK:
 370                                 if ( count( $requests ) > 1 ) {
 371                                         throw new InvalidArgumentException( 'only one auth request can be changed at a time' );
 372                                 } elseif ( !$requests ) {
 373                                         throw new InvalidArgumentException( 'no auth request' );
 374                                 }
 375                                 $req = reset( $requests );
 376                                 $status = $authManager->allowsAuthenticationDataChange( $req );
 377                                 Hooks::run( 'ChangeAuthenticationDataAudit', [ $req, $status ] );
 378                                 if ( !$status->isOK() ) {
 379                                         return AuthenticationResponse::newFail( $status->getMessage() );
 380                                 }
 381                                 $authManager->changeAuthenticationData( $req );
 382                                 return AuthenticationResponse::newPass();
 383                         default:
 384                                 // should never reach here but makes static code analyzers happy
 385                                 throw new InvalidArgumentException( 'invalid action: ' . $action );
 386                 }
 387         }
 388
 389         /**
 390          * Attempts to do an authentication step with the submitted data.
 391          * Subclasses should probably call this from execute().
 392          * @return false|Status
 393          *    - false if there was no submit at all
 394          *    - a good Status wrapping an AuthenticationResponse if the form submit was successful.
 395          *      This does not necessarily mean that the authentication itself was successful; see the
 396          *      response for that.
 397          *    - a bad Status for form errors.
 398          */
 399         protected function trySubmit() {
 400                 $status = false;
 401
 402                 $form = $this->getAuthForm( $this->authRequests, $this->authAction );
 403                 $form->setSubmitCallback( [ $this, 'handleFormSubmit' ] );
 404
 405                 if ( $this->getRequest()->wasPosted() ) {
 406                         // handle tokens manually; $form->tryAuthorizedSubmit only works for logged-in users
 407                         $requestTokenValue = $this->getRequest()->getVal( $this->getTokenName() );
 408                         $sessionToken = $this->getToken();
 409                         if ( $sessionToken->wasNew() ) {
 410                                 return Status::newFatal( $this->messageKey( 'authform-newtoken' ) );
 411                         } elseif ( !$requestTokenValue ) {
 412                                 return Status::newFatal( $this->messageKey( 'authform-notoken' ) );
 413                         } elseif ( !$sessionToken->match( $requestTokenValue ) ) {
 414                                 return Status::newFatal( $this->messageKey( 'authform-wrongtoken' ) );
 415                         }
 416
 417                         $form->prepareForm();
 418                         $status = $form->trySubmit();
 419
 420                         // HTMLForm submit return values are a mess; let's ensure it is false or a Status
 421                         // FIXME this probably should be in HTMLForm
 422                         if ( $status === true ) {
 423                                 // not supposed to happen since our submit handler should always return a Status
 424                                 throw new UnexpectedValueException( 'HTMLForm::trySubmit() returned true' );
 425                         } elseif ( $status === false ) {
 426                                 // form was not submitted; nothing to do
 427                         } elseif ( $status instanceof Status ) {
 428                                 // already handled by the form; nothing to do
 429                         } elseif ( $status instanceof StatusValue ) {
 430                                 // in theory not an allowed return type but nothing stops the submit handler from
 431                                 // accidentally returning it so best check and fix
 432                                 $status = Status::wrap( $status );
 433                         } elseif ( is_string( $status ) ) {
 434                                 $status = Status::newFatal( new RawMessage( '$1', $status ) );
 435                         } elseif ( is_array( $status ) ) {
 436                                 if ( is_string( reset( $status ) ) ) {
 437                                         $status = call_user_func_array( 'Status::newFatal', $status );
 438                                 } elseif ( is_array( reset( $status ) ) ) {
 439                                         $status = Status::newGood();
 440                                         foreach ( $status as $message ) {
 441                                                 call_user_func_array( [ $status, 'fatal' ], $message );
 442                                         }
 443                                 } else {
 444                                         throw new UnexpectedValueException( 'invalid HTMLForm::trySubmit() return value: '
 445                                                 . 'first element of array is ' . gettype( reset( $status ) ) );
 446                                 }
 447                         } else {
 448                                 // not supposed to happen but HTMLForm does not actually verify the return type
 449                                 // from the submit callback; better safe then sorry
 450                                 throw new UnexpectedValueException( 'invalid HTMLForm::trySubmit() return type: '
 451                                         . gettype( $status ) );
 452                         }
 453
 454                         if ( ( !$status || !$status->isOK() ) && $this->isReturn ) {
 455                                 // This is awkward. There was a form validation error, which means the data was not
 456                                 // passed to AuthManager. Normally we would display the form with an error message,
 457                                 // but for the data we received via the redirect flow that would not be helpful at all.
 458                                 // Let's just submit the data to AuthManager directly instead.
 459                                 LoggerFactory::getInstance( 'authmanager' )
 460                                         ->warning( 'Validation error on return', [ 'data' => $form->mFieldData,
 461                                                 'status' => $status->getWikiText() ] );
 462                                 $status = $this->handleFormSubmit( $form->mFieldData );
 463                         }
 464                 }
 465
 466                 $changeActions = [
 467                         AuthManager::ACTION_CHANGE, AuthManager::ACTION_REMOVE, AuthManager::ACTION_UNLINK
 468                 ];
 469                 if ( in_array( $this->authAction, $changeActions, true ) && $status && !$status->isOK() ) {
 470                         Hooks::run( 'ChangeAuthenticationDataAudit', [ reset( $this->authRequests ), $status ] );
 471                 }
 472
 473                 return $status;
 474         }
 475
 476         /**
 477          * Submit handler callback for HTMLForm
 478          * @private
 479          * @param $data array Submitted data
 480          * @return Status
 481          */
 482         public function handleFormSubmit( $data ) {
 483                 $requests = AuthenticationRequest::loadRequestsFromSubmission( $this->authRequests, $data );
 484                 $response = $this->performAuthenticationStep( $this->authAction, $requests );
 485
 486                 // we can't handle FAIL or similar as failure here since it might require changing the form
 487                 return Status::newGood( $response );
 488         }
 489
 490         /**
 491          * Returns URL query parameters which can be used to reload the page (or leave and return) while
 492          * preserving all information that is necessary for authentication to continue. These parameters
 493          * will be preserved in the action URL of the form and in the return URL for redirect flow.
 494          * @param bool $withToken Include CSRF token
 495          * @return array
 496          */
 497         protected function getPreservedParams( $withToken = false ) {
 498                 $params = [];
 499                 if ( $this->authAction !== $this->getDefaultAction( $this->subPage ) ) {
 500                         $params['authAction'] = $this->getContinueAction( $this->authAction );
 501                 }
 502                 if ( $withToken ) {
 503                         $params[$this->getTokenName()] = $this->getToken()->toString();
 504                 }
 505                 return $params;
 506         }
 507
 508         /**
 509          * Generates a HTMLForm descriptor array from a set of authentication requests.
 510          * @param AuthenticationRequest[] $requests
 511          * @param string $action AuthManager action name (one of the AuthManager::ACTION_* constants)
 512          * @return array
 513          */
 514         protected function getAuthFormDescriptor( $requests, $action ) {
 515                 $fieldInfo = AuthenticationRequest::mergeFieldInfo( $requests );
 516                 $formDescriptor = $this->fieldInfoToFormDescriptor( $requests, $fieldInfo, $action );
 517
 518                 $this->addTabIndex( $formDescriptor );
 519
 520                 return $formDescriptor;
 521         }
 522
 523         /**
 524          * @param AuthenticationRequest[] $requests
 525          * @param string $action AuthManager action name (one of the AuthManager::ACTION_* constants)
 526          * @return HTMLForm
 527          */
 528         protected function getAuthForm( array $requests, $action ) {
 529                 $formDescriptor = $this->getAuthFormDescriptor( $requests, $action );
 530                 $context = $this->getContext();
 531                 if ( $context->getRequest() !== $this->getRequest() ) {
 532                         // We have overridden the request, need to make sure the form uses that too.
 533                         $context = new DerivativeContext( $this->getContext() );
 534                         $context->setRequest( $this->getRequest() );
 535                 }
 536                 $form = HTMLForm::factory( 'ooui', $formDescriptor, $context );
 537                 $form->setAction( $this->getFullTitle()->getFullURL( $this->getPreservedParams() ) );
 538                 $form->addHiddenField( $this->getTokenName(), $this->getToken()->toString() );
 539                 $form->addHiddenField( 'authAction', $this->authAction );
 540                 $form->suppressDefaultSubmit( !$this->needsSubmitButton( $formDescriptor ) );
 541
 542                 return $form;
 543         }
 544
 545         /**
 546          * Display the form.
 547          * @param false|Status|StatusValue $status A form submit status, as in HTMLForm::trySubmit()
 548          */
 549         protected function displayForm( $status ) {
 550                 if ( $status instanceof StatusValue ) {
 551                         $status = Status::wrap( $status );
 552                 }
 553                 $form = $this->getAuthForm( $this->authRequests, $this->authAction );
 554                 $form->prepareForm()->displayForm( $status );
 555         }
 556
 557         /**
 558          * Returns true if the form has fields which take values. If all available providers use the
 559          * redirect flow, the form might contain nothing but submit buttons, in which case we should
 560          * not add an extra submit button which does nothing.
 561          *
 562          * @param array $formDescriptor A HTMLForm descriptor
 563          * @return bool
 564          */
 565         protected function needsSubmitButton( $formDescriptor ) {
 566                 return (bool)array_filter( $formDescriptor, function ( $item ) {
 567                         $class = false;
 568                         if ( array_key_exists( 'class', $item ) ) {
 569                                 $class = $item['class'];
 570                         } elseif ( array_key_exists( 'type', $item ) ) {
 571                                 $class = HTMLForm::$typeMappings[$item['type']];
 572                         }
 573                         return !in_array( $class, [ 'HTMLInfoField', 'HTMLSubmitField' ], true );
 574                 } );
 575         }
 576
 577         /**
 578          * Adds a sequential tabindex starting from 1 to all form elements. This way the user can
 579          * use the tab key to traverse the form without having to step through all links and such.
 580          * @param $formDescriptor
 581          */
 582         protected function addTabIndex( &$formDescriptor ) {
 583                 $i = 1;
 584                 foreach ( $formDescriptor as $field => &$definition ) {
 585                         $class = false;
 586                         if ( array_key_exists( 'class', $definition ) ) {
 587                                 $class = $definition['class'];
 588                         } elseif ( array_key_exists( 'type', $definition ) ) {
 589                                 $class = HTMLForm::$typeMappings[$definition['type']];
 590                         }
 591                         if ( $class !== 'HTMLInfoField' ) {
 592                                 $definition['tabindex'] = $i;
 593                                 $i++;
 594                         }
 595                 }
 596         }
 597
 598         /**
 599          * Returns the CSRF token.
 600          * @return Token
 601          */
 602         protected function getToken() {
 603                 return $this->getRequest()->getSession()->getToken( 'AuthManagerSpecialPage:'
 604                         . $this->getName() );
 605         }
 606
 607         /**
 608          * Returns the name of the CSRF token (under which it should be found in the POST or GET data).
 609          * @return string
 610          */
 611         protected function getTokenName() {
 612                 return 'wpAuthToken';
 613         }
 614
 615         /**
 616          * Turns a field info array into a form descriptor. Behavior can be modified by the
 617          * AuthChangeFormFields hook.
 618          * @param AuthenticationRequest[] $requests
 619          * @param array $fieldInfo Field information, in the format used by
 620          *   AuthenticationRequest::getFieldInfo()
 621          * @param string $action One of the AuthManager::ACTION_* constants
 622          * @return array A form descriptor that can be passed to HTMLForm
 623          */
 624         protected function fieldInfoToFormDescriptor( array $requests, array $fieldInfo, $action ) {
 625                 $formDescriptor = [];
 626                 foreach ( $fieldInfo as $fieldName => $singleFieldInfo ) {
 627                         $formDescriptor[$fieldName] = self::mapSingleFieldInfo( $singleFieldInfo, $fieldName );
 628                 }
 629
 630                 $requestSnapshot = serialize( $requests );
 631                 $this->onAuthChangeFormFields( $requests, $fieldInfo, $formDescriptor, $action );
 632                 \Hooks::run( 'AuthChangeFormFields', [ $requests, $fieldInfo, &$formDescriptor, $action ] );
 633                 if ( $requestSnapshot !== serialize( $requests ) ) {
 634                         LoggerFactory::getInstance( 'authentication' )->warning(
 635                                 'AuthChangeFormFields hook changed auth requests' );
 636                 }
 637
 638                 // Process the special 'weight' property, which is a way for AuthChangeFormFields hook
 639                 // subscribers (who only see one field at a time) to influence ordering.
 640                 self::sortFormDescriptorFields( $formDescriptor );
 641
 642                 return $formDescriptor;
 643         }
 644
 645         /**
 646          * Maps an authentication field configuration for a single field (as returned by
 647          * AuthenticationRequest::getFieldInfo()) to a HTMLForm field descriptor.
 648          * @param array $singleFieldInfo
 649          * @return array
 650          */
 651         protected static function mapSingleFieldInfo( $singleFieldInfo, $fieldName ) {
 652                 $type = self::mapFieldInfoTypeToFormDescriptorType( $singleFieldInfo['type'] );
 653                 $descriptor = [
 654                         'type' => $type,
 655                         // Do not prefix input name with 'wp'. This is important for the redirect flow.
 656                         'name' => $fieldName,
 657                 ];
 658
 659                 if ( $type === 'submit' && isset( $singleFieldInfo['label'] ) ) {
 660                         $descriptor['default'] = wfMessage( $singleFieldInfo['label'] )->plain();
 661                 } elseif ( $type !== 'submit' ) {
 662                         $descriptor += array_filter( [
 663                                 // help-message is omitted as it is usually not really useful for a web interface
 664                                 'label-message' => self::getField( $singleFieldInfo, 'label' ),
 665                         ] );
 666
 667                         if ( isset( $singleFieldInfo['options'] ) ) {
 668                                 $descriptor['options'] = array_flip( array_map( function ( $message ) {
 669                                         /** @var $message Message */
 670                                         return $message->parse();
 671                                 }, $singleFieldInfo['options'] ) );
 672                         }
 673
 674                         if ( isset( $singleFieldInfo['value'] ) ) {
 675                                 $descriptor['default'] = $singleFieldInfo['value'];
 676                         }
 677
 678                         if ( empty( $singleFieldInfo['optional'] ) ) {
 679                                 $descriptor['required'] = true;
 680                         }
 681                 }
 682
 683                 return $descriptor;
 684         }
 685
 686         /**
 687          * Sort the fields of a form descriptor by their 'weight' property. (Fields with higher weight
 688          * are shown closer to the bottom; weight defaults to 0. Negative weight is allowed.)
 689          * Keep order if weights are equal.
 690          * @param array $formDescriptor
 691          * @return array
 692          */
 693         protected static function sortFormDescriptorFields( array &$formDescriptor ) {
 694                 $i = 0;
 695                 foreach ( $formDescriptor as &$field ) {
 696                         $field['__index'] = $i++;
 697                 }
 698                 uasort( $formDescriptor, function ( $first, $second ) {
 699                         return self::getField( $first, 'weight', 0 ) - self::getField( $second, 'weight', 0 )
 700                                 ?: $first['__index'] - $second['__index'];
 701                 } );
 702                 foreach ( $formDescriptor as &$field ) {
 703                         unset( $field['__index'] );
 704                 }
 705         }
 706
 707         /**
 708          * Get an array value, or a default if it does not exist.
 709          * @param array $array
 710          * @param string $fieldName
 711          * @param mixed $default
 712          * @return mixed
 713          */
 714         protected static function getField( array $array, $fieldName, $default = null ) {
 715                 if ( array_key_exists( $fieldName, $array ) ) {
 716                         return $array[$fieldName];
 717                 } else {
 718                         return $default;
 719                 }
 720         }
 721
 722         /**
 723          * Maps AuthenticationRequest::getFieldInfo() types to HTMLForm types
 724          * @param string $type
 725          * @return string
 726          * @throws \LogicException
 727          */
 728         protected static function mapFieldInfoTypeToFormDescriptorType( $type ) {
 729                 $map = [
 730                         'string' => 'text',
 731                         'password' => 'password',
 732                         'select' => 'select',
 733                         'checkbox' => 'check',
 734                         'multiselect' => 'multiselect',
 735                         'button' => 'submit',
 736                         'hidden' => 'hidden',
 737                         'null' => 'info',
 738                 ];
 739                 if ( !array_key_exists( $type, $map ) ) {
 740                         throw new \LogicException( 'invalid field type: ' . $type );
 741                 }
 742                 return $map[$type];
 743         }
 744 }