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\Token;
   8
   9 /**
  10  * A special page subclass for authentication-related special pages. It generates a form from
  11  * a set of AuthenticationRequest objects, submits the result to AuthManager and
  12  * partially handles the response.
  13  */
  14 abstract class AuthManagerSpecialPage extends SpecialPage {
  15         /** @var string[] The list of actions this special page deals with. Subclasses should override
  16          * this. */
  17         protected static $allowedActions = [
  18                 AuthManager::ACTION_LOGIN, AuthManager::ACTION_LOGIN_CONTINUE,
  19                 AuthManager::ACTION_CREATE, AuthManager::ACTION_CREATE_CONTINUE,
  20                 AuthManager::ACTION_LINK, AuthManager::ACTION_LINK_CONTINUE,
  21                 AuthManager::ACTION_CHANGE, AuthManager::ACTION_REMOVE, AuthManager::ACTION_UNLINK,
  22         ];
  23
  24         /** @var array Customized messages */
  25         protected static $messages = [];
  26
  27         /** @var string one of the AuthManager::ACTION_* constants. */
  28         protected $authAction;
  29
  30         /** @var AuthenticationRequest[] */
  31         protected $authRequests;
  32
  33         /** @var string Subpage of the special page. */
  34         protected $subPage;
  35
  36         /** @var bool True if the current request is a result of returning from a redirect flow. */
  37         protected $isReturn;
  38
  39         /** @var WebRequest|null If set, will be used instead of the real request. Used for redirection. */
  40         protected $savedRequest;
  41
  42         /**
  43          * Change the form descriptor that determines how a field will look in the authentication form.
  44          * Called from fieldInfoToFormDescriptor().
  45          * @param AuthenticationRequest[] $requests
  46          * @param array $fieldInfo Field information array (union of all
  47          *    AuthenticationRequest::getFieldInfo() responses).
  48          * @param array &$formDescriptor HTMLForm descriptor. The special key 'weight' can be set to
  49          *    change the order of the fields.
  50          * @param string $action Authentication type (one of the AuthManager::ACTION_* constants)
  51          * @return bool
  52          */
  53         public function onAuthChangeFormFields(
  54                 array $requests, array $fieldInfo, array &$formDescriptor, $action
  55         ) {
  56                 return true;
  57         }
  58
  59         protected function getLoginSecurityLevel() {
  60                 return $this->getName();
  61         }
  62
  63         public function getRequest() {
  64                 return $this->savedRequest ?: $this->getContext()->getRequest();
  65         }
  66
  67         /**
  68          * Override the POST data, GET data from the real request is preserved.
  69          *
  70          * Used to preserve POST data over a HTTP redirect.
  71          *
  72          * @param array $data
  73          * @param bool $wasPosted
  74          */
  75         protected function setRequest( array $data, $wasPosted = null ) {
  76                 $request = $this->getContext()->getRequest();
  77                 if ( $wasPosted === null ) {
  78                         $wasPosted = $request->wasPosted();
  79                 }
  80                 $this->savedRequest = new DerivativeRequest( $request, $data + $request->getQueryValues(),
  81                         $wasPosted );
  82         }
  83
  84         protected function beforeExecute( $subPage ) {
  85                 $this->getOutput()->disallowUserJs();
  86
  87                 return $this->handleReturnBeforeExecute( $subPage )
  88                         && $this->handleReauthBeforeExecute( $subPage );
  89         }
  90
  91         /**
  92          * Handle redirection from the /return subpage.
  93          *
  94          * This is used in the redirect flow where we need
  95          * to be able to process data that was sent via a GET request. We set the /return subpage as
  96          * the reentry point so we know we need to treat GET as POST, but we don't want to handle all
  97          * future GETs as POSTs so we need to normalize the URL. (Also we don't want to show any
  98          * received parameters around in the URL; they are ugly and might be sensitive.)
  99          *
 100          * Thus when on the /return subpage, we stash the request data in the session, redirect, then
 101          * use the session to detect that we have been redirected, recover the data and replace the
 102          * real WebRequest with a fake one that contains the saved data.
 103          *
 104          * @param string $subPage
 105          * @return bool False if execution should be stopped.
 106          */
 107         protected function handleReturnBeforeExecute( $subPage ) {
 108                 $authManager = AuthManager::singleton();
 109                 $key = 'AuthManagerSpecialPage:return:' . $this->getName();
 110
 111                 if ( $subPage === 'return' ) {
 112                         $this->loadAuth( $subPage );
 113                         $preservedParams = $this->getPreservedParams( false );
 114
 115                         // FIXME save POST values only from request
 116                         $authData = array_diff_key( $this->getRequest()->getValues(),
 117                                 $preservedParams, [ 'title' => 1 ] );
 118                         $authManager->setAuthenticationSessionData( $key, $authData );
 119
 120                         $url = $this->getPageTitle()->getFullURL( $preservedParams, false, PROTO_HTTPS );
 121                         $this->getOutput()->redirect( $url );
 122                         return false;
 123                 }
 124
 125                 $authData = $authManager->getAuthenticationSessionData( $key );
 126                 if ( $authData ) {
 127                         $authManager->removeAuthenticationSessionData( $key );
 128                         $this->isReturn = true;
 129                         $this->setRequest( $authData, true );
 130                 }
 131
 132                 return true;
 133         }
 134
 135         /**
 136          * Handle redirection when the user needs to (re)authenticate.
 137          *
 138          * Send the user to the login form if needed; in case the request was a POST, stash in the
 139          * session and simulate it once the user gets back.
 140          *
 141          * @param string $subPage
 142          * @return bool False if execution should be stopped.
 143          * @throws ErrorPageError When the user is not allowed to use this page.
 144          */
 145         protected function handleReauthBeforeExecute( $subPage ) {
 146                 $authManager = AuthManager::singleton();
 147                 $request = $this->getRequest();
 148                 $key = 'AuthManagerSpecialPage:reauth:' . $this->getName();
 149
 150                 $securityLevel = $this->getLoginSecurityLevel();
 151                 if ( $securityLevel ) {
 152                         $securityStatus = AuthManager::singleton()
 153                                 ->securitySensitiveOperationStatus( $securityLevel );
 154                         if ( $securityStatus === AuthManager::SEC_REAUTH ) {
 155                                 $queryParams = array_diff_key( $request->getQueryValues(), [ 'title' => true ] );
 156
 157                                 if ( $request->wasPosted() ) {
 158                                         // unique ID in case the same special page is open in multiple browser tabs
 159                                         $uniqueId = MWCryptRand::generateHex( 6 );
 160                                         $key = $key . ':' . $uniqueId;
 161
 162                                         $queryParams = [ 'authUniqueId' => $uniqueId ] + $queryParams;
 163                                         $authData = array_diff_key( $request->getValues(),
 164                                                         $this->getPreservedParams( false ), [ 'title' => 1 ] );
 165                                         $authManager->setAuthenticationSessionData( $key, $authData );
 166                                 }
 167
 168                                 $title = SpecialPage::getTitleFor( 'Userlogin' );
 169                                 $url = $title->getFullURL( [
 170                                         'returnto' => $this->getFullTitle()->getPrefixedDBkey(),
 171                                         'returntoquery' => wfArrayToCgi( $queryParams ),
 172                                         'force' => $securityLevel,
 173                                 ], false, PROTO_HTTPS );
 174
 175                                 $this->getOutput()->redirect( $url );
 176                                 return false;
 177                         } elseif ( $securityStatus !== AuthManager::SEC_OK ) {
 178                                 throw new ErrorPageError( 'cannotauth-not-allowed-title', 'cannotauth-not-allowed' );
 179                         }
 180                 }
 181
 182                 $uniqueId = $request->getVal( 'authUniqueId' );
 183                 if ( $uniqueId ) {
 184                         $key = $key . ':' . $uniqueId;
 185                         $authData = $authManager->getAuthenticationSessionData( $key );
 186                         if ( $authData ) {
 187                                 $authManager->removeAuthenticationSessionData( $key );
 188                                 $this->setRequest( $authData, true );
 189                         }
 190                 }
 191
 192                 return true;
 193         }
 194
 195         /**
 196          * Get the default action for this special page, if none is given via URL/POST data.
 197          * Subclasses should override this (or override loadAuth() so this is never called).
 198          * @param string $subPage Subpage of the special page.
 199          * @return string an AuthManager::ACTION_* constant.
 200          */
 201         abstract protected function getDefaultAction( $subPage );
 202
 203         /**
 204          * Return custom message key.
 205          * Allows subclasses to customize messages.
 206          * @param string $defaultKey
 207          * @return string
 208          */
 209         protected function messageKey( $defaultKey ) {
 210                 return array_key_exists( $defaultKey, static::$messages )
 211                         ? static::$messages[$defaultKey] : $defaultKey;
 212         }
 213
 214         /**
 215          * Allows blacklisting certain request types.
 216          * @return array A list of AuthenticationRequest subclass names
 217          */
 218         protected function getRequestBlacklist() {
 219                 return [];
 220         }
 221
 222         /**
 223          * Load or initialize $authAction, $authRequests and $subPage.
 224          * Subclasses should call this from execute() or otherwise ensure the variables are initialized.
 225          * @param string $subPage Subpage of the special page.
 226          * @param string $authAction Override auth action specified in request (this is useful
 227          *    when the form needs to be changed from <action> to <action>_CONTINUE after a successful
 228          *    authentication step)
 229          * @param bool $reset Regenerate the requests even if a cached version is available
 230          */
 231         protected function loadAuth( $subPage, $authAction = null, $reset = false ) {
 232                 // Do not load if already loaded, to cut down on the number of getAuthenticationRequests
 233                 // calls. This is important for requests which have hidden information so any
 234                 // getAuthenticationRequests call would mean putting data into some cache.
 235                 if (
 236                         !$reset && $this->subPage === $subPage && $this->authAction
 237                         && ( !$authAction || $authAction === $this->authAction )
 238                 ) {
 239                         return;
 240                 }
 241
 242                 $request = $this->getRequest();
 243                 $this->subPage = $subPage;
 244                 $this->authAction = $authAction ?: $request->getText( 'authAction' );
 245                 if ( !in_array( $this->authAction, static::$allowedActions, true ) ) {
 246                         $this->authAction = $this->getDefaultAction( $subPage );
 247                         if ( $request->wasPosted() ) {
 248                                 $continueAction = $this->getContinueAction( $this->authAction );
 249                                 if ( in_array( $continueAction, static::$allowedActions, true ) ) {
 250                                         $this->authAction = $continueAction;
 251                                 }
 252                         }
 253                 }
 254
 255                 $allReqs = AuthManager::singleton()->getAuthenticationRequests(
 256                         $this->authAction, $this->getUser() );
 257                 $this->authRequests = array_filter( $allReqs, function ( $req ) use ( $subPage ) {
 258                         return !in_array( get_class( $req ), $this->getRequestBlacklist(), true );
 259                 } );
 260         }
 261
 262         /**
 263          * Returns true if this is not the first step of the authentication.
 264          * @return bool
 265          */
 266         protected function isContinued() {
 267                 return in_array( $this->authAction, [
 268                         AuthManager::ACTION_LOGIN_CONTINUE,
 269                         AuthManager::ACTION_CREATE_CONTINUE,
 270                         AuthManager::ACTION_LINK_CONTINUE,
 271                 ], true );
 272         }
 273
 274         /**
 275          * Gets the _CONTINUE version of an action.
 276          * @param string $action An AuthManager::ACTION_* constant.
 277          * @return string An AuthManager::ACTION_*_CONTINUE constant.
 278          */
 279         protected function getContinueAction( $action ) {
 280                 switch ( $action ) {
 281                         case AuthManager::ACTION_LOGIN:
 282                                 $action = AuthManager::ACTION_LOGIN_CONTINUE;
 283                                 break;
 284                         case AuthManager::ACTION_CREATE:
 285                                 $action = AuthManager::ACTION_CREATE_CONTINUE;
 286                                 break;
 287                         case AuthManager::ACTION_LINK:
 288                                 $action = AuthManager::ACTION_LINK_CONTINUE;
 289                                 break;
 290                 }
 291                 return $action;
 292         }
 293
 294         /**
 295          * Checks whether AuthManager is ready to perform the action.
 296          * ACTION_CHANGE needs special verification (AuthManager::allowsAuthenticationData*) which is
 297          * the caller's responsibility.
 298          * @param string $action One of the AuthManager::ACTION_* constants in static::$allowedActions
 299          * @return bool
 300          * @throws LogicException if $action is invalid
 301          */
 302         protected function isActionAllowed( $action ) {
 303                 $authManager = AuthManager::singleton();
 304                 if ( !in_array( $action, static::$allowedActions, true ) ) {
 305                         throw new InvalidArgumentException( 'invalid action: ' . $action );
 306                 }
 307
 308                 // calling getAuthenticationRequests can be expensive, avoid if possible
 309                 $requests = ( $action === $this->authAction ) ? $this->authRequests
 310                         : $authManager->getAuthenticationRequests( $action );
 311                 if ( !$requests ) {
 312                         // no provider supports this action in the current state
 313                         return false;
 314                 }
 315
 316                 switch ( $action ) {
 317                         case AuthManager::ACTION_LOGIN:
 318                         case AuthManager::ACTION_LOGIN_CONTINUE:
 319                                 return $authManager->canAuthenticateNow();
 320                         case AuthManager::ACTION_CREATE:
 321                         case AuthManager::ACTION_CREATE_CONTINUE:
 322                                 return $authManager->canCreateAccounts();
 323                         case AuthManager::ACTION_LINK:
 324                         case AuthManager::ACTION_LINK_CONTINUE:
 325                                 return $authManager->canLinkAccounts();
 326                         case AuthManager::ACTION_CHANGE:
 327                         case AuthManager::ACTION_REMOVE:
 328                         case AuthManager::ACTION_UNLINK:
 329                                 return true;
 330                         default:
 331                                 // should never reach here but makes static code analyzers happy
 332                                 throw new InvalidArgumentException( 'invalid action: ' . $action );
 333                 }
 334         }
 335
 336         /**
 337          * @param string $action One of the AuthManager::ACTION_* constants
 338          * @param AuthenticationRequest[] $requests
 339          * @return AuthenticationResponse
 340          * @throws LogicException if $action is invalid
 341          */
 342         protected function performAuthenticationStep( $action, array $requests ) {
 343                 if ( !in_array( $action, static::$allowedActions, true ) ) {
 344                         throw new InvalidArgumentException( 'invalid action: ' . $action );
 345                 }
 346
 347                 $authManager = AuthManager::singleton();
 348                 $returnToUrl = $this->getPageTitle( 'return' )
 349                         ->getFullURL( $this->getPreservedParams( true ), false, PROTO_HTTPS );
 350
 351                 switch ( $action ) {
 352                         case AuthManager::ACTION_LOGIN:
 353                                 return $authManager->beginAuthentication( $requests, $returnToUrl );
 354                         case AuthManager::ACTION_LOGIN_CONTINUE:
 355                                 return $authManager->continueAuthentication( $requests );
 356                         case AuthManager::ACTION_CREATE:
 357                                 return $authManager->beginAccountCreation( $this->getUser(), $requests,
 358                                         $returnToUrl );
 359                         case AuthManager::ACTION_CREATE_CONTINUE:
 360                                 return $authManager->continueAccountCreation( $requests );
 361                         case AuthManager::ACTION_LINK:
 362                                 return $authManager->beginAccountLink( $this->getUser(), $requests, $returnToUrl );
 363                         case AuthManager::ACTION_LINK_CONTINUE:
 364                                 return $authManager->continueAccountLink( $requests );
 365                         case AuthManager::ACTION_CHANGE:
 366                         case AuthManager::ACTION_REMOVE:
 367                         case AuthManager::ACTION_UNLINK:
 368                                 if ( count( $requests ) > 1 ) {
 369                                         throw new InvalidArgumentException( 'only one auth request can be changed at a time' );
 370                                 } elseif ( !$requests ) {
 371                                         throw new InvalidArgumentException( 'no auth request' );
 372                                 }
 373                                 $req = reset( $requests );
 374                                 $status = $authManager->allowsAuthenticationDataChange( $req );
 375                                 Hooks::run( 'ChangeAuthenticationDataAudit', [ $req, $status ] );
 376                                 if ( !$status->isGood() ) {
 377                                         return AuthenticationResponse::newFail( $status->getMessage() );
 378                                 }
 379                                 $authManager->changeAuthenticationData( $req );
 380                                 return AuthenticationResponse::newPass();
 381                         default:
 382                                 // should never reach here but makes static code analyzers happy
 383                                 throw new InvalidArgumentException( 'invalid action: ' . $action );
 384                 }
 385         }
 386
 387         /**
 388          * Attempts to do an authentication step with the submitted data.
 389          * Subclasses should probably call this from execute().
 390          * @return false|Status
 391          *    - false if there was no submit at all
 392          *    - a good Status wrapping an AuthenticationResponse if the form submit was successful.
 393          *      This does not necessarily mean that the authentication itself was successful; see the
 394          *      response for that.
 395          *    - a bad Status for form errors.
 396          */
 397         protected function trySubmit() {
 398                 $status = false;
 399
 400                 $form = $this->getAuthForm( $this->authRequests, $this->authAction );
 401                 $form->setSubmitCallback( [ $this, 'handleFormSubmit' ] );
 402
 403                 if ( $this->getRequest()->wasPosted() ) {
 404                         // handle tokens manually; $form->tryAuthorizedSubmit only works for logged-in users
 405                         $requestTokenValue = $this->getRequest()->getVal( $this->getTokenName() );
 406                         $sessionToken = $this->getToken();
 407                         if ( $sessionToken->wasNew() ) {
 408                                 return Status::newFatal( $this->messageKey( 'authform-newtoken' ) );
 409                         } elseif ( !$requestTokenValue ) {
 410                                 return Status::newFatal( $this->messageKey( 'authform-notoken' ) );
 411                         } elseif ( !$sessionToken->match( $requestTokenValue ) ) {
 412                                 return Status::newFatal( $this->messageKey( 'authform-wrongtoken' ) );
 413                         }
 414
 415                         $form->prepareForm();
 416                         $status = $form->trySubmit();
 417
 418                         // HTMLForm submit return values are a mess; let's ensure it is false or a Status
 419                         // FIXME this probably should be in HTMLForm
 420                         if ( $status === true ) {
 421                                 // not supposed to happen since our submit handler should always return a Status
 422                                 throw new UnexpectedValueException( 'HTMLForm::trySubmit() returned true' );
 423                         } elseif ( $status === false ) {
 424                                 // form was not submitted; nothing to do
 425                         } elseif ( $status instanceof Status ) {
 426                                 // already handled by the form; nothing to do
 427                         } elseif ( $status instanceof StatusValue ) {
 428                                 // in theory not an allowed return type but nothing stops the submit handler from
 429                                 // accidentally returning it so best check and fix
 430                                 $status = Status::wrap( $status );
 431                         } elseif ( is_string( $status ) ) {
 432                                 $status = Status::newFatal( new RawMessage( '$1', $status ) );
 433                         } elseif ( is_array( $status ) ) {
 434                                 if ( is_string( reset( $status ) ) ) {
 435                                         $status = call_user_func_array( 'Status::newFatal', $status );
 436                                 } elseif ( is_array( reset( $status ) ) ) {
 437                                         $status = Status::newGood();
 438                                         foreach ( $status as $message ) {
 439                                                 call_user_func_array( [ $status, 'fatal' ], $message );
 440                                         }
 441                                 } else {
 442                                         throw new UnexpectedValueException( 'invalid HTMLForm::trySubmit() return value: '
 443                                                 . 'first element of array is ' . gettype( reset( $status ) ) );
 444                                 }
 445                         } else {
 446                                 // not supposed to happen but HTMLForm does not actually verify the return type
 447                                 // from the submit callback; better safe then sorry
 448                                 throw new UnexpectedValueException( 'invalid HTMLForm::trySubmit() return type: '
 449                                         . gettype( $status ) );
 450                         }
 451
 452                         if ( ( !$status || !$status->isOK() ) && $this->isReturn ) {
 453                                 // This is awkward. There was a form validation error, which means the data was not
 454                                 // passed to AuthManager. Normally we would display the form with an error message,
 455                                 // but for the data we received via the redirect flow that would not be helpful at all.
 456                                 // Let's just submit the data to AuthManager directly instead.
 457                                 LoggerFactory::getInstance( 'authentication' )
 458                                         ->warning( 'Validation error on return', [ 'data' => $form->mFieldData,
 459                                                 'status' => $status->getWikiText() ] );
 460                                 $status = $this->handleFormSubmit( $form->mFieldData );
 461                         }
 462                 }
 463
 464                 $changeActions = [
 465                         AuthManager::ACTION_CHANGE, AuthManager::ACTION_REMOVE, AuthManager::ACTION_UNLINK
 466                 ];
 467                 if ( in_array( $this->authAction, $changeActions, true ) && $status && !$status->isOK() ) {
 468                         Hooks::run( 'ChangeAuthenticationDataAudit', [ reset( $this->authRequests ), $status ] );
 469                 }
 470
 471                 return $status;
 472         }
 473
 474         /**
 475          * Submit handler callback for HTMLForm
 476          * @private
 477          * @param array $data Submitted data
 478          * @return Status
 479          */
 480         public function handleFormSubmit( $data ) {
 481                 $requests = AuthenticationRequest::loadRequestsFromSubmission( $this->authRequests, $data );
 482                 $response = $this->performAuthenticationStep( $this->authAction, $requests );
 483
 484                 // we can't handle FAIL or similar as failure here since it might require changing the form
 485                 return Status::newGood( $response );
 486         }
 487
 488         /**
 489          * Returns URL query parameters which can be used to reload the page (or leave and return) while
 490          * preserving all information that is necessary for authentication to continue. These parameters
 491          * will be preserved in the action URL of the form and in the return URL for redirect flow.
 492          * @param bool $withToken Include CSRF token
 493          * @return array
 494          */
 495         protected function getPreservedParams( $withToken = false ) {
 496                 $params = [];
 497                 if ( $this->authAction !== $this->getDefaultAction( $this->subPage ) ) {
 498                         $params['authAction'] = $this->getContinueAction( $this->authAction );
 499                 }
 500                 if ( $withToken ) {
 501                         $params[$this->getTokenName()] = $this->getToken()->toString();
 502                 }
 503                 return $params;
 504         }
 505
 506         /**
 507          * Generates a HTMLForm descriptor array from a set of authentication requests.
 508          * @param AuthenticationRequest[] $requests
 509          * @param string $action AuthManager action name (one of the AuthManager::ACTION_* constants)
 510          * @return array
 511          */
 512         protected function getAuthFormDescriptor( $requests, $action ) {
 513                 $fieldInfo = AuthenticationRequest::mergeFieldInfo( $requests );
 514                 $formDescriptor = $this->fieldInfoToFormDescriptor( $requests, $fieldInfo, $action );
 515
 516                 $this->addTabIndex( $formDescriptor );
 517
 518                 return $formDescriptor;
 519         }
 520
 521         /**
 522          * @param AuthenticationRequest[] $requests
 523          * @param string $action AuthManager action name (one of the AuthManager::ACTION_* constants)
 524          * @return HTMLForm
 525          */
 526         protected function getAuthForm( array $requests, $action ) {
 527                 $formDescriptor = $this->getAuthFormDescriptor( $requests, $action );
 528                 $context = $this->getContext();
 529                 if ( $context->getRequest() !== $this->getRequest() ) {
 530                         // We have overridden the request, need to make sure the form uses that too.
 531                         $context = new DerivativeContext( $this->getContext() );
 532                         $context->setRequest( $this->getRequest() );
 533                 }
 534                 $form = HTMLForm::factory( 'ooui', $formDescriptor, $context );
 535                 $form->setAction( $this->getFullTitle()->getFullURL( $this->getPreservedParams() ) );
 536                 $form->addHiddenField( $this->getTokenName(), $this->getToken()->toString() );
 537                 $form->addHiddenField( 'authAction', $this->authAction );
 538                 $form->suppressDefaultSubmit( !$this->needsSubmitButton( $requests ) );
 539
 540                 return $form;
 541         }
 542
 543         /**
 544          * Display the form.
 545          * @param false|Status|StatusValue $status A form submit status, as in HTMLForm::trySubmit()
 546          */
 547         protected function displayForm( $status ) {
 548                 if ( $status instanceof StatusValue ) {
 549                         $status = Status::wrap( $status );
 550                 }
 551                 $form = $this->getAuthForm( $this->authRequests, $this->authAction );
 552                 $form->prepareForm()->displayForm( $status );
 553         }
 554
 555         /**
 556          * Returns true if the form built from the given AuthenticationRequests needs a submit button.
 557          * Providers using redirect flow (e.g. Google login) need their own submit buttons; if using
 558          * one of those custom buttons is the only way to proceed, there is no point in displaying the
 559          * default button which won't do anything useful.
 560          *
 561          * @param AuthenticationRequest[] $requests An array of AuthenticationRequests from which the
 562          *  form will be built
 563          * @return bool
 564          */
 565         protected function needsSubmitButton( array $requests ) {
 566                 $customSubmitButtonPresent = false;
 567
 568                 // Secondary and preauth providers always need their data; they will not care what button
 569                 // is used, so they can be ignored. So can OPTIONAL buttons createdby primary providers;
 570                 // that's the point in being optional. Se we need to check whether all primary providers
 571                 // have their own buttons and whether there is at least one button present.
 572                 foreach ( $requests as $req ) {
 573                         if ( $req->required === AuthenticationRequest::PRIMARY_REQUIRED ) {
 574                                 if ( $this->hasOwnSubmitButton( $req ) ) {
 575                                         $customSubmitButtonPresent = true;
 576                                 } else {
 577                                         return true;
 578                                 }
 579                         }
 580                 }
 581                 return !$customSubmitButtonPresent;
 582         }
 583
 584         /**
 585          * Checks whether the given AuthenticationRequest has its own submit button.
 586          * @param AuthenticationRequest $req
 587          * @return bool
 588          */
 589         protected function hasOwnSubmitButton( AuthenticationRequest $req ) {
 590                 foreach ( $req->getFieldInfo() as $field => $info ) {
 591                         if ( $info['type'] === 'button' ) {
 592                                 return true;
 593                         }
 594                 }
 595                 return false;
 596         }
 597
 598         /**
 599          * Adds a sequential tabindex starting from 1 to all form elements. This way the user can
 600          * use the tab key to traverse the form without having to step through all links and such.
 601          * @param array &$formDescriptor
 602          */
 603         protected function addTabIndex( &$formDescriptor ) {
 604                 $i = 1;
 605                 foreach ( $formDescriptor as $field => &$definition ) {
 606                         $class = false;
 607                         if ( array_key_exists( 'class', $definition ) ) {
 608                                 $class = $definition['class'];
 609                         } elseif ( array_key_exists( 'type', $definition ) ) {
 610                                 $class = HTMLForm::$typeMappings[$definition['type']];
 611                         }
 612                         if ( $class !== 'HTMLInfoField' ) {
 613                                 $definition['tabindex'] = $i;
 614                                 $i++;
 615                         }
 616                 }
 617         }
 618
 619         /**
 620          * Returns the CSRF token.
 621          * @return Token
 622          */
 623         protected function getToken() {
 624                 return $this->getRequest()->getSession()->getToken( 'AuthManagerSpecialPage:'
 625                         . $this->getName() );
 626         }
 627
 628         /**
 629          * Returns the name of the CSRF token (under which it should be found in the POST or GET data).
 630          * @return string
 631          */
 632         protected function getTokenName() {
 633                 return 'wpAuthToken';
 634         }
 635
 636         /**
 637          * Turns a field info array into a form descriptor. Behavior can be modified by the
 638          * AuthChangeFormFields hook.
 639          * @param AuthenticationRequest[] $requests
 640          * @param array $fieldInfo Field information, in the format used by
 641          *   AuthenticationRequest::getFieldInfo()
 642          * @param string $action One of the AuthManager::ACTION_* constants
 643          * @return array A form descriptor that can be passed to HTMLForm
 644          */
 645         protected function fieldInfoToFormDescriptor( array $requests, array $fieldInfo, $action ) {
 646                 $formDescriptor = [];
 647                 foreach ( $fieldInfo as $fieldName => $singleFieldInfo ) {
 648                         $formDescriptor[$fieldName] = self::mapSingleFieldInfo( $singleFieldInfo, $fieldName );
 649                 }
 650
 651                 $requestSnapshot = serialize( $requests );
 652                 $this->onAuthChangeFormFields( $requests, $fieldInfo, $formDescriptor, $action );
 653                 \Hooks::run( 'AuthChangeFormFields', [ $requests, $fieldInfo, &$formDescriptor, $action ] );
 654                 if ( $requestSnapshot !== serialize( $requests ) ) {
 655                         LoggerFactory::getInstance( 'authentication' )->warning(
 656                                 'AuthChangeFormFields hook changed auth requests' );
 657                 }
 658
 659                 // Process the special 'weight' property, which is a way for AuthChangeFormFields hook
 660                 // subscribers (who only see one field at a time) to influence ordering.
 661                 self::sortFormDescriptorFields( $formDescriptor );
 662
 663                 return $formDescriptor;
 664         }
 665
 666         /**
 667          * Maps an authentication field configuration for a single field (as returned by
 668          * AuthenticationRequest::getFieldInfo()) to a HTMLForm field descriptor.
 669          * @param array $singleFieldInfo
 670          * @param string $fieldName
 671          * @return array
 672          */
 673         protected static function mapSingleFieldInfo( $singleFieldInfo, $fieldName ) {
 674                 $type = self::mapFieldInfoTypeToFormDescriptorType( $singleFieldInfo['type'] );
 675                 $descriptor = [
 676                         'type' => $type,
 677                         // Do not prefix input name with 'wp'. This is important for the redirect flow.
 678                         'name' => $fieldName,
 679                 ];
 680
 681                 if ( $type === 'submit' && isset( $singleFieldInfo['label'] ) ) {
 682                         $descriptor['default'] = wfMessage( $singleFieldInfo['label'] )->plain();
 683                 } elseif ( $type !== 'submit' ) {
 684                         $descriptor += array_filter( [
 685                                 // help-message is omitted as it is usually not really useful for a web interface
 686                                 'label-message' => self::getField( $singleFieldInfo, 'label' ),
 687                         ] );
 688
 689                         if ( isset( $singleFieldInfo['options'] ) ) {
 690                                 $descriptor['options'] = array_flip( array_map( function ( $message ) {
 691                                         /** @var $message Message */
 692                                         return $message->parse();
 693                                 }, $singleFieldInfo['options'] ) );
 694                         }
 695
 696                         if ( isset( $singleFieldInfo['value'] ) ) {
 697                                 $descriptor['default'] = $singleFieldInfo['value'];
 698                         }
 699
 700                         if ( empty( $singleFieldInfo['optional'] ) ) {
 701                                 $descriptor['required'] = true;
 702                         }
 703                 }
 704
 705                 return $descriptor;
 706         }
 707
 708         /**
 709          * Sort the fields of a form descriptor by their 'weight' property. (Fields with higher weight
 710          * are shown closer to the bottom; weight defaults to 0. Negative weight is allowed.)
 711          * Keep order if weights are equal.
 712          * @param array &$formDescriptor
 713          * @return array
 714          */
 715         protected static function sortFormDescriptorFields( array &$formDescriptor ) {
 716                 $i = 0;
 717                 foreach ( $formDescriptor as &$field ) {
 718                         $field['__index'] = $i++;
 719                 }
 720                 uasort( $formDescriptor, function ( $first, $second ) {
 721                         return self::getField( $first, 'weight', 0 ) - self::getField( $second, 'weight', 0 )
 722                                 ?: $first['__index'] - $second['__index'];
 723                 } );
 724                 foreach ( $formDescriptor as &$field ) {
 725                         unset( $field['__index'] );
 726                 }
 727         }
 728
 729         /**
 730          * Get an array value, or a default if it does not exist.
 731          * @param array $array
 732          * @param string $fieldName
 733          * @param mixed $default
 734          * @return mixed
 735          */
 736         protected static function getField( array $array, $fieldName, $default = null ) {
 737                 if ( array_key_exists( $fieldName, $array ) ) {
 738                         return $array[$fieldName];
 739                 } else {
 740                         return $default;
 741                 }
 742         }
 743
 744         /**
 745          * Maps AuthenticationRequest::getFieldInfo() types to HTMLForm types
 746          * @param string $type
 747          * @return string
 748          * @throws \LogicException
 749          */
 750         protected static function mapFieldInfoTypeToFormDescriptorType( $type ) {
 751                 $map = [
 752                         'string' => 'text',
 753                         'password' => 'password',
 754                         'select' => 'select',
 755                         'checkbox' => 'check',
 756                         'multiselect' => 'multiselect',
 757                         'button' => 'submit',
 758                         'hidden' => 'hidden',
 759                         'null' => 'info',
 760                 ];
 761                 if ( !array_key_exists( $type, $map ) ) {
 762                         throw new \LogicException( 'invalid field type: ' . $type );
 763                 }
 764                 return $map[$type];
 765         }
 766 }