includes/htmlform/HTMLForm.php

   1 <?php
   2
   3 /**
   4  * HTML form generation and submission handling.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along
  17  * with this program; if not, write to the Free Software Foundation, Inc.,
  18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  19  * http://www.gnu.org/copyleft/gpl.html
  20  *
  21  * @file
  22  */
  23
  24 use Wikimedia\ObjectFactory;
  25
  26 /**
  27  * Object handling generic submission, CSRF protection, layout and
  28  * other logic for UI forms. in a reusable manner.
  29  *
  30  * In order to generate the form, the HTMLForm object takes an array
  31  * structure detailing the form fields available. Each element of the
  32  * array is a basic property-list, including the type of field, the
  33  * label it is to be given in the form, callbacks for validation and
  34  * 'filtering', and other pertinent information.
  35  *
  36  * Field types are implemented as subclasses of the generic HTMLFormField
  37  * object, and typically implement at least getInputHTML, which generates
  38  * the HTML for the input field to be placed in the table.
  39  *
  40  * You can find extensive documentation on the www.mediawiki.org wiki:
  41  *  - https://www.mediawiki.org/wiki/HTMLForm
  42  *  - https://www.mediawiki.org/wiki/HTMLForm/tutorial
  43  *
  44  * The constructor input is an associative array of $fieldname => $info,
  45  * where $info is an Associative Array with any of the following:
  46  *
  47  *    'class'               -- the subclass of HTMLFormField that will be used
  48  *                             to create the object.  *NOT* the CSS class!
  49  *    'type'                -- roughly translates into the <select> type attribute.
  50  *                             if 'class' is not specified, this is used as a map
  51  *                             through HTMLForm::$typeMappings to get the class name.
  52  *    'default'             -- default value when the form is displayed
  53  *    'nodata'              -- if set (to any value, which casts to true), the data
  54  *                             for this field will not be loaded from the actual request. Instead,
  55  *                             always the default data is set as the value of this field.
  56  *    'id'                  -- HTML id attribute
  57  *    'cssclass'            -- CSS class
  58  *    'csshelpclass'        -- CSS class used to style help text
  59  *    'dir'                 -- Direction of the element.
  60  *    'options'             -- associative array mapping raw text labels to values.
  61  *                             Some field types support multi-level arrays.
  62  *                             Overwrites 'options-message'.
  63  *    'options-messages'    -- associative array mapping message keys to values.
  64  *                             Some field types support multi-level arrays.
  65  *                             Overwrites 'options' and 'options-message'.
  66  *    'options-message'     -- message key or object to be parsed to extract the list of
  67  *                             options (like 'ipbreason-dropdown').
  68  *    'label-message'       -- message key or object for a message to use as the label.
  69  *                             can be an array of msg key and then parameters to
  70  *                             the message.
  71  *    'label'               -- alternatively, a raw text message. Overridden by
  72  *                             label-message
  73  *    'help'                -- message text for a message to use as a help text.
  74  *    'help-message'        -- message key or object for a message to use as a help text.
  75  *                             can be an array of msg key and then parameters to
  76  *                             the message.
  77  *                             Overwrites 'help-messages' and 'help'.
  78  *    'help-messages'       -- array of message keys/objects. As above, each item can
  79  *                             be an array of msg key and then parameters.
  80  *                             Overwrites 'help'.
  81  *    'help-inline'         -- Whether help text (defined using options above) will be shown
  82  *                             inline after the input field, rather than in a popup.
  83  *                             Defaults to true. Only used by OOUI form fields.
  84  *    'notice'              -- (deprecated, use 'help' instead)
  85  *    'notice-messages'     -- (deprecated, use 'help-messages' instead)
  86  *    'notice-message'      -- (deprecated, use 'help-message' instead)
  87  *    'required'            -- passed through to the object, indicating that it
  88  *                             is a required field.
  89  *    'size'                -- the length of text fields
  90  *    'filter-callback'     -- a function name to give you the chance to
  91  *                             massage the inputted value before it's processed.
  92  *                             @see HTMLFormField::filter()
  93  *    'validation-callback' -- a function name to give you the chance
  94  *                             to impose extra validation on the field input.
  95  *                             @see HTMLFormField::validate()
  96  *    'name'                -- By default, the 'name' attribute of the input field
  97  *                             is "wp{$fieldname}".  If you want a different name
  98  *                             (eg one without the "wp" prefix), specify it here and
  99  *                             it will be used without modification.
 100  *    'hide-if'             -- expression given as an array stating when the field
 101  *                             should be hidden. The first array value has to be the
 102  *                             expression's logic operator. Supported expressions:
 103  *                               'NOT'
 104  *                                 [ 'NOT', array $expression ]
 105  *                                 To hide a field if a given expression is not true.
 106  *                               '==='
 107  *                                 [ '===', string $fieldName, string $value ]
 108  *                                 To hide a field if another field identified by
 109  *                                 $field has the value $value.
 110  *                               '!=='
 111  *                                 [ '!==', string $fieldName, string $value ]
 112  *                                 Same as [ 'NOT', [ '===', $fieldName, $value ]
 113  *                               'OR', 'AND', 'NOR', 'NAND'
 114  *                                 [ 'XXX', array $expression1, ..., array $expressionN ]
 115  *                                 To hide a field if one or more (OR), all (AND),
 116  *                                 neither (NOR) or not all (NAND) given expressions
 117  *                                 are evaluated as true.
 118  *                             The expressions will be given to a JavaScript frontend
 119  *                             module which will continually update the field's
 120  *                             visibility.
 121  *
 122  * Since 1.20, you can chain mutators to ease the form generation:
 123  * @par Example:
 124  * @code
 125  * $form = new HTMLForm( $someFields );
 126  * $form->setMethod( 'get' )
 127  *      ->setWrapperLegendMsg( 'message-key' )
 128  *      ->prepareForm()
 129  *      ->displayForm( '' );
 130  * @endcode
 131  * Note that you will have prepareForm and displayForm at the end. Other
 132  * methods call done after that would simply not be part of the form :(
 133  *
 134  * @todo Document 'section' / 'subsection' stuff
 135  */
 136 class HTMLForm extends ContextSource {
 137         // A mapping of 'type' inputs onto standard HTMLFormField subclasses
 138         public static $typeMappings = [
 139                 'api' => HTMLApiField::class,
 140                 'text' => HTMLTextField::class,
 141                 'textwithbutton' => HTMLTextFieldWithButton::class,
 142                 'textarea' => HTMLTextAreaField::class,
 143                 'select' => HTMLSelectField::class,
 144                 'combobox' => HTMLComboboxField::class,
 145                 'radio' => HTMLRadioField::class,
 146                 'multiselect' => HTMLMultiSelectField::class,
 147                 'limitselect' => HTMLSelectLimitField::class,
 148                 'check' => HTMLCheckField::class,
 149                 'toggle' => HTMLCheckField::class,
 150                 'int' => HTMLIntField::class,
 151                 'float' => HTMLFloatField::class,
 152                 'info' => HTMLInfoField::class,
 153                 'selectorother' => HTMLSelectOrOtherField::class,
 154                 'selectandother' => HTMLSelectAndOtherField::class,
 155                 'namespaceselect' => HTMLSelectNamespace::class,
 156                 'namespaceselectwithbutton' => HTMLSelectNamespaceWithButton::class,
 157                 'tagfilter' => HTMLTagFilter::class,
 158                 'sizefilter' => HTMLSizeFilterField::class,
 159                 'submit' => HTMLSubmitField::class,
 160                 'hidden' => HTMLHiddenField::class,
 161                 'edittools' => HTMLEditTools::class,
 162                 'checkmatrix' => HTMLCheckMatrix::class,
 163                 'cloner' => HTMLFormFieldCloner::class,
 164                 'autocompleteselect' => HTMLAutoCompleteSelectField::class,
 165                 'date' => HTMLDateTimeField::class,
 166                 'time' => HTMLDateTimeField::class,
 167                 'datetime' => HTMLDateTimeField::class,
 168                 'expiry' => HTMLExpiryField::class,
 169                 // HTMLTextField will output the correct type="" attribute automagically.
 170                 // There are about four zillion other HTML5 input types, like range, but
 171                 // we don't use those at the moment, so no point in adding all of them.
 172                 'email' => HTMLTextField::class,
 173                 'password' => HTMLTextField::class,
 174                 'url' => HTMLTextField::class,
 175                 'title' => HTMLTitleTextField::class,
 176                 'user' => HTMLUserTextField::class,
 177                 'usersmultiselect' => HTMLUsersMultiselectField::class,
 178                 'titlesmultiselect' => HTMLTitlesMultiselectField::class,
 179         ];
 180
 181         public $mFieldData;
 182
 183         protected $mMessagePrefix;
 184
 185         /** @var HTMLFormField[] */
 186         protected $mFlatFields;
 187
 188         protected $mFieldTree;
 189         protected $mShowReset = false;
 190         protected $mShowSubmit = true;
 191         protected $mSubmitFlags = [ 'primary', 'progressive' ];
 192         protected $mShowCancel = false;
 193         protected $mCancelTarget;
 194
 195         protected $mSubmitCallback;
 196         protected $mValidationErrorMessage;
 197
 198         protected $mPre = '';
 199         protected $mHeader = '';
 200         protected $mFooter = '';
 201         protected $mSectionHeaders = [];
 202         protected $mSectionFooters = [];
 203         protected $mPost = '';
 204         protected $mId;
 205         protected $mName;
 206         protected $mTableId = '';
 207
 208         protected $mSubmitID;
 209         protected $mSubmitName;
 210         protected $mSubmitText;
 211         protected $mSubmitTooltip;
 212
 213         protected $mFormIdentifier;
 214         protected $mTitle;
 215         protected $mMethod = 'post';
 216         protected $mWasSubmitted = false;
 217
 218         /**
 219          * Form action URL. false means we will use the URL to set Title
 220          * @since 1.19
 221          * @var bool|string
 222          */
 223         protected $mAction = false;
 224
 225         /**
 226          * Form attribute autocomplete. A typical value is "off". null does not set the attribute
 227          * @since 1.27
 228          * @var string|null
 229          */
 230         protected $mAutocomplete = null;
 231
 232         protected $mUseMultipart = false;
 233         protected $mHiddenFields = [];
 234         protected $mButtons = [];
 235
 236         protected $mWrapperLegend = false;
 237
 238         /**
 239          * Salt for the edit token.
 240          * @var string|array
 241          */
 242         protected $mTokenSalt = '';
 243
 244         /**
 245          * If true, sections that contain both fields and subsections will
 246          * render their subsections before their fields.
 247          *
 248          * Subclasses may set this to false to render subsections after fields
 249          * instead.
 250          */
 251         protected $mSubSectionBeforeFields = true;
 252
 253         /**
 254          * Format in which to display form. For viable options,
 255          * @see $availableDisplayFormats
 256          * @var string
 257          */
 258         protected $displayFormat = 'table';
 259
 260         /**
 261          * Available formats in which to display the form
 262          * @var array
 263          */
 264         protected $availableDisplayFormats = [
 265                 'table',
 266                 'div',
 267                 'raw',
 268                 'inline',
 269         ];
 270
 271         /**
 272          * Available formats in which to display the form
 273          * @var array
 274          */
 275         protected $availableSubclassDisplayFormats = [
 276                 'vform',
 277                 'ooui',
 278         ];
 279
 280         /**
 281          * Construct a HTMLForm object for given display type. May return a HTMLForm subclass.
 282          *
 283          * @param string $displayFormat
 284          * @param mixed $arguments,... Additional arguments to pass to the constructor.
 285          * @return HTMLForm
 286          */
 287         public static function factory( $displayFormat/*, $arguments...*/ ) {
 288                 $arguments = func_get_args();
 289                 array_shift( $arguments );
 290
 291                 switch ( $displayFormat ) {
 292                         case 'vform':
 293                                 return ObjectFactory::constructClassInstance( VFormHTMLForm::class, $arguments );
 294                         case 'ooui':
 295                                 return ObjectFactory::constructClassInstance( OOUIHTMLForm::class, $arguments );
 296                         default:
 297                                 /** @var HTMLForm $form */
 298                                 $form = ObjectFactory::constructClassInstance( self::class, $arguments );
 299                                 $form->setDisplayFormat( $displayFormat );
 300                                 return $form;
 301                 }
 302         }
 303
 304         /**
 305          * Build a new HTMLForm from an array of field attributes
 306          *
 307          * @param array $descriptor Array of Field constructs, as described above
 308          * @param IContextSource|null $context Available since 1.18, will become compulsory in 1.18.
 309          *     Obviates the need to call $form->setTitle()
 310          * @param string $messagePrefix A prefix to go in front of default messages
 311          */
 312         public function __construct( $descriptor, /*IContextSource*/ $context = null,
 313                 $messagePrefix = ''
 314         ) {
 315                 if ( $context instanceof IContextSource ) {
 316                         $this->setContext( $context );
 317                         $this->mTitle = false; // We don't need them to set a title
 318                         $this->mMessagePrefix = $messagePrefix;
 319                 } elseif ( $context === null && $messagePrefix !== '' ) {
 320                         $this->mMessagePrefix = $messagePrefix;
 321                 } elseif ( is_string( $context ) && $messagePrefix === '' ) {
 322                         // B/C since 1.18
 323                         // it's actually $messagePrefix
 324                         $this->mMessagePrefix = $context;
 325                 }
 326
 327                 // Evil hack for mobile :(
 328                 if (
 329                         !$this->getConfig()->get( 'HTMLFormAllowTableFormat' )
 330                         && $this->displayFormat === 'table'
 331                 ) {
 332                         $this->displayFormat = 'div';
 333                 }
 334
 335                 // Expand out into a tree.
 336                 $loadedDescriptor = [];
 337                 $this->mFlatFields = [];
 338
 339                 foreach ( $descriptor as $fieldname => $info ) {
 340                         $section = $info['section'] ?? '';
 341
 342                         if ( isset( $info['type'] ) && $info['type'] === 'file' ) {
 343                                 $this->mUseMultipart = true;
 344                         }
 345
 346                         $field = static::loadInputFromParameters( $fieldname, $info, $this );
 347
 348                         $setSection =& $loadedDescriptor;
 349                         if ( $section ) {
 350                                 $sectionParts = explode( '/', $section );
 351
 352                                 while ( count( $sectionParts ) ) {
 353                                         $newName = array_shift( $sectionParts );
 354
 355                                         if ( !isset( $setSection[$newName] ) ) {
 356                                                 $setSection[$newName] = [];
 357                                         }
 358
 359                                         $setSection =& $setSection[$newName];
 360                                 }
 361                         }
 362
 363                         $setSection[$fieldname] = $field;
 364                         $this->mFlatFields[$fieldname] = $field;
 365                 }
 366
 367                 $this->mFieldTree = $loadedDescriptor;
 368         }
 369
 370         /**
 371          * @param string $fieldname
 372          * @return bool
 373          */
 374         public function hasField( $fieldname ) {
 375                 return isset( $this->mFlatFields[$fieldname] );
 376         }
 377
 378         /**
 379          * @param string $fieldname
 380          * @return HTMLFormField
 381          * @throws DomainException on invalid field name
 382          */
 383         public function getField( $fieldname ) {
 384                 if ( !$this->hasField( $fieldname ) ) {
 385                         throw new DomainException( __METHOD__ . ': no field named ' . $fieldname );
 386                 }
 387                 return $this->mFlatFields[$fieldname];
 388         }
 389
 390         /**
 391          * Set format in which to display the form
 392          *
 393          * @param string $format The name of the format to use, must be one of
 394          *   $this->availableDisplayFormats
 395          *
 396          * @throws MWException
 397          * @since 1.20
 398          * @return HTMLForm $this for chaining calls (since 1.20)
 399          */
 400         public function setDisplayFormat( $format ) {
 401                 if (
 402                         in_array( $format, $this->availableSubclassDisplayFormats, true ) ||
 403                         in_array( $this->displayFormat, $this->availableSubclassDisplayFormats, true )
 404                 ) {
 405                         throw new MWException( 'Cannot change display format after creation, ' .
 406                                 'use HTMLForm::factory() instead' );
 407                 }
 408
 409                 if ( !in_array( $format, $this->availableDisplayFormats, true ) ) {
 410                         throw new MWException( 'Display format must be one of ' .
 411                                 print_r(
 412                                         array_merge(
 413                                                 $this->availableDisplayFormats,
 414                                                 $this->availableSubclassDisplayFormats
 415                                         ),
 416                                         true
 417                                 ) );
 418                 }
 419
 420                 // Evil hack for mobile :(
 421                 if ( !$this->getConfig()->get( 'HTMLFormAllowTableFormat' ) && $format === 'table' ) {
 422                         $format = 'div';
 423                 }
 424
 425                 $this->displayFormat = $format;
 426
 427                 return $this;
 428         }
 429
 430         /**
 431          * Getter for displayFormat
 432          * @since 1.20
 433          * @return string
 434          */
 435         public function getDisplayFormat() {
 436                 return $this->displayFormat;
 437         }
 438
 439         /**
 440          * Get the HTMLFormField subclass for this descriptor.
 441          *
 442          * The descriptor can be passed either 'class' which is the name of
 443          * a HTMLFormField subclass, or a shorter 'type' which is an alias.
 444          * This makes sure the 'class' is always set, and also is returned by
 445          * this function for ease.
 446          *
 447          * @since 1.23
 448          *
 449          * @param string $fieldname Name of the field
 450          * @param array &$descriptor Input Descriptor, as described above
 451          *
 452          * @throws MWException
 453          * @return string Name of a HTMLFormField subclass
 454          */
 455         public static function getClassFromDescriptor( $fieldname, &$descriptor ) {
 456                 if ( isset( $descriptor['class'] ) ) {
 457                         $class = $descriptor['class'];
 458                 } elseif ( isset( $descriptor['type'] ) ) {
 459                         $class = static::$typeMappings[$descriptor['type']];
 460                         $descriptor['class'] = $class;
 461                 } else {
 462                         $class = null;
 463                 }
 464
 465                 if ( !$class ) {
 466                         throw new MWException( "Descriptor with no class for $fieldname: "
 467                                 . print_r( $descriptor, true ) );
 468                 }
 469
 470                 return $class;
 471         }
 472
 473         /**
 474          * Initialise a new Object for the field
 475          *
 476          * @param string $fieldname Name of the field
 477          * @param array $descriptor Input Descriptor, as described above
 478          * @param HTMLForm|null $parent Parent instance of HTMLForm
 479          *
 480          * @throws MWException
 481          * @return HTMLFormField Instance of a subclass of HTMLFormField
 482          */
 483         public static function loadInputFromParameters( $fieldname, $descriptor,
 484                 HTMLForm $parent = null
 485         ) {
 486                 $class = static::getClassFromDescriptor( $fieldname, $descriptor );
 487
 488                 $descriptor['fieldname'] = $fieldname;
 489                 if ( $parent ) {
 490                         $descriptor['parent'] = $parent;
 491                 }
 492
 493                 # @todo This will throw a fatal error whenever someone try to use
 494                 # 'class' to feed a CSS class instead of 'cssclass'. Would be
 495                 # great to avoid the fatal error and show a nice error.
 496                 return new $class( $descriptor );
 497         }
 498
 499         /**
 500          * Prepare form for submission.
 501          *
 502          * @warning When doing method chaining, that should be the very last
 503          * method call before displayForm().
 504          *
 505          * @throws MWException
 506          * @return HTMLForm $this for chaining calls (since 1.20)
 507          */
 508         public function prepareForm() {
 509                 # Check if we have the info we need
 510                 if ( !$this->mTitle instanceof Title && $this->mTitle !== false ) {
 511                         throw new MWException( 'You must call setTitle() on an HTMLForm' );
 512                 }
 513
 514                 # Load data from the request.
 515                 if (
 516                         $this->mFormIdentifier === null ||
 517                         $this->getRequest()->getVal( 'wpFormIdentifier' ) === $this->mFormIdentifier
 518                 ) {
 519                         $this->loadData();
 520                 } else {
 521                         $this->mFieldData = [];
 522                 }
 523
 524                 return $this;
 525         }
 526
 527         /**
 528          * Try submitting, with edit token check first
 529          * @return Status|bool
 530          */
 531         public function tryAuthorizedSubmit() {
 532                 $result = false;
 533
 534                 $identOkay = false;
 535                 if ( $this->mFormIdentifier === null ) {
 536                         $identOkay = true;
 537                 } else {
 538                         $identOkay = $this->getRequest()->getVal( 'wpFormIdentifier' ) === $this->mFormIdentifier;
 539                 }
 540
 541                 $tokenOkay = false;
 542                 if ( $this->getMethod() !== 'post' ) {
 543                         $tokenOkay = true; // no session check needed
 544                 } elseif ( $this->getRequest()->wasPosted() ) {
 545                         $editToken = $this->getRequest()->getVal( 'wpEditToken' );
 546                         if ( $this->getUser()->isLoggedIn() || $editToken !== null ) {
 547                                 // Session tokens for logged-out users have no security value.
 548                                 // However, if the user gave one, check it in order to give a nice
 549                                 // "session expired" error instead of "permission denied" or such.
 550                                 $tokenOkay = $this->getUser()->matchEditToken( $editToken, $this->mTokenSalt );
 551                         } else {
 552                                 $tokenOkay = true;
 553                         }
 554                 }
 555
 556                 if ( $tokenOkay && $identOkay ) {
 557                         $this->mWasSubmitted = true;
 558                         $result = $this->trySubmit();
 559                 }
 560
 561                 return $result;
 562         }
 563
 564         /**
 565          * The here's-one-I-made-earlier option: do the submission if
 566          * posted, or display the form with or without funky validation
 567          * errors
 568          * @return bool|Status Whether submission was successful.
 569          */
 570         public function show() {
 571                 $this->prepareForm();
 572
 573                 $result = $this->tryAuthorizedSubmit();
 574                 if ( $result === true || ( $result instanceof Status && $result->isGood() ) ) {
 575                         return $result;
 576                 }
 577
 578                 $this->displayForm( $result );
 579
 580                 return false;
 581         }
 582
 583         /**
 584          * Same as self::show with the difference, that the form will be
 585          * added to the output, no matter, if the validation was good or not.
 586          * @return bool|Status Whether submission was successful.
 587          */
 588         public function showAlways() {
 589                 $this->prepareForm();
 590
 591                 $result = $this->tryAuthorizedSubmit();
 592
 593                 $this->displayForm( $result );
 594
 595                 return $result;
 596         }
 597
 598         /**
 599          * Validate all the fields, and call the submission callback
 600          * function if everything is kosher.
 601          * @throws MWException
 602          * @return bool|string|array|Status
 603          *     - Bool true or a good Status object indicates success,
 604          *     - Bool false indicates no submission was attempted,
 605          *     - Anything else indicates failure. The value may be a fatal Status
 606          *       object, an HTML string, or an array of arrays (message keys and
 607          *       params) or strings (message keys)
 608          */
 609         public function trySubmit() {
 610                 $valid = true;
 611                 $hoistedErrors = Status::newGood();
 612                 if ( $this->mValidationErrorMessage ) {
 613                         foreach ( (array)$this->mValidationErrorMessage as $error ) {
 614                                 $hoistedErrors->fatal( ...$error );
 615                         }
 616                 } else {
 617                         $hoistedErrors->fatal( 'htmlform-invalid-input' );
 618                 }
 619
 620                 $this->mWasSubmitted = true;
 621
 622                 # Check for cancelled submission
 623                 foreach ( $this->mFlatFields as $fieldname => $field ) {
 624                         if ( !array_key_exists( $fieldname, $this->mFieldData ) ) {
 625                                 continue;
 626                         }
 627                         if ( $field->cancelSubmit( $this->mFieldData[$fieldname], $this->mFieldData ) ) {
 628                                 $this->mWasSubmitted = false;
 629                                 return false;
 630                         }
 631                 }
 632
 633                 # Check for validation
 634                 foreach ( $this->mFlatFields as $fieldname => $field ) {
 635                         if ( !array_key_exists( $fieldname, $this->mFieldData ) ) {
 636                                 continue;
 637                         }
 638                         if ( $field->isHidden( $this->mFieldData ) ) {
 639                                 continue;
 640                         }
 641                         $res = $field->validate( $this->mFieldData[$fieldname], $this->mFieldData );
 642                         if ( $res !== true ) {
 643                                 $valid = false;
 644                                 if ( $res !== false && !$field->canDisplayErrors() ) {
 645                                         if ( is_string( $res ) ) {
 646                                                 $hoistedErrors->fatal( 'rawmessage', $res );
 647                                         } else {
 648                                                 $hoistedErrors->fatal( $res );
 649                                         }
 650                                 }
 651                         }
 652                 }
 653
 654                 if ( !$valid ) {
 655                         return $hoistedErrors;
 656                 }
 657
 658                 $callback = $this->mSubmitCallback;
 659                 if ( !is_callable( $callback ) ) {
 660                         throw new MWException( 'HTMLForm: no submit callback provided. Use ' .
 661                                 'setSubmitCallback() to set one.' );
 662                 }
 663
 664                 $data = $this->filterDataForSubmit( $this->mFieldData );
 665
 666                 $res = call_user_func( $callback, $data, $this );
 667                 if ( $res === false ) {
 668                         $this->mWasSubmitted = false;
 669                 }
 670
 671                 return $res;
 672         }
 673
 674         /**
 675          * Test whether the form was considered to have been submitted or not, i.e.
 676          * whether the last call to tryAuthorizedSubmit or trySubmit returned
 677          * non-false.
 678          *
 679          * This will return false until HTMLForm::tryAuthorizedSubmit or
 680          * HTMLForm::trySubmit is called.
 681          *
 682          * @since 1.23
 683          * @return bool
 684          */
 685         public function wasSubmitted() {
 686                 return $this->mWasSubmitted;
 687         }
 688
 689         /**
 690          * Set a callback to a function to do something with the form
 691          * once it's been successfully validated.
 692          *
 693          * @param callable $cb The function will be passed the output from
 694          *   HTMLForm::filterDataForSubmit and this HTMLForm object, and must
 695          *   return as documented for HTMLForm::trySubmit
 696          *
 697          * @return HTMLForm $this for chaining calls (since 1.20)
 698          */
 699         public function setSubmitCallback( $cb ) {
 700                 $this->mSubmitCallback = $cb;
 701
 702                 return $this;
 703         }
 704
 705         /**
 706          * Set a message to display on a validation error.
 707          *
 708          * @param string|array $msg String or Array of valid inputs to wfMessage()
 709          *     (so each entry can be either a String or Array)
 710          *
 711          * @return HTMLForm $this for chaining calls (since 1.20)
 712          */
 713         public function setValidationErrorMessage( $msg ) {
 714                 $this->mValidationErrorMessage = $msg;
 715
 716                 return $this;
 717         }
 718
 719         /**
 720          * Set the introductory message, overwriting any existing message.
 721          *
 722          * @param string $msg Complete text of message to display
 723          *
 724          * @return HTMLForm $this for chaining calls (since 1.20)
 725          */
 726         public function setIntro( $msg ) {
 727                 $this->setPreText( $msg );
 728
 729                 return $this;
 730         }
 731
 732         /**
 733          * Set the introductory message HTML, overwriting any existing message.
 734          * @since 1.19
 735          *
 736          * @param string $msg Complete HTML of message to display
 737          *
 738          * @return HTMLForm $this for chaining calls (since 1.20)
 739          */
 740         public function setPreText( $msg ) {
 741                 $this->mPre = $msg;
 742
 743                 return $this;
 744         }
 745
 746         /**
 747          * Add HTML to introductory message.
 748          *
 749          * @param string $msg Complete HTML of message to display
 750          *
 751          * @return HTMLForm $this for chaining calls (since 1.20)
 752          */
 753         public function addPreText( $msg ) {
 754                 $this->mPre .= $msg;
 755
 756                 return $this;
 757         }
 758
 759         /**
 760          * Get the introductory message HTML.
 761          *
 762          * @since 1.32
 763          *
 764          * @return string
 765          */
 766         public function getPreText() {
 767                 return $this->mPre;
 768         }
 769
 770         /**
 771          * Add HTML to the header, inside the form.
 772          *
 773          * @param string $msg Additional HTML to display in header
 774          * @param string|null $section The section to add the header to
 775          *
 776          * @return HTMLForm $this for chaining calls (since 1.20)
 777          */
 778         public function addHeaderText( $msg, $section = null ) {
 779                 if ( $section === null ) {
 780                         $this->mHeader .= $msg;
 781                 } else {
 782                         if ( !isset( $this->mSectionHeaders[$section] ) ) {
 783                                 $this->mSectionHeaders[$section] = '';
 784                         }
 785                         $this->mSectionHeaders[$section] .= $msg;
 786                 }
 787
 788                 return $this;
 789         }
 790
 791         /**
 792          * Set header text, inside the form.
 793          * @since 1.19
 794          *
 795          * @param string $msg Complete HTML of header to display
 796          * @param string|null $section The section to add the header to
 797          *
 798          * @return HTMLForm $this for chaining calls (since 1.20)
 799          */
 800         public function setHeaderText( $msg, $section = null ) {
 801                 if ( $section === null ) {
 802                         $this->mHeader = $msg;
 803                 } else {
 804                         $this->mSectionHeaders[$section] = $msg;
 805                 }
 806
 807                 return $this;
 808         }
 809
 810         /**
 811          * Get header text.
 812          *
 813          * @param string|null $section The section to get the header text for
 814          * @since 1.26
 815          * @return string HTML
 816          */
 817         public function getHeaderText( $section = null ) {
 818                 if ( $section === null ) {
 819                         return $this->mHeader;
 820                 } else {
 821                         return $this->mSectionHeaders[$section] ?? '';
 822                 }
 823         }
 824
 825         /**
 826          * Add footer text, inside the form.
 827          *
 828          * @param string $msg Complete text of message to display
 829          * @param string|null $section The section to add the footer text to
 830          *
 831          * @return HTMLForm $this for chaining calls (since 1.20)
 832          */
 833         public function addFooterText( $msg, $section = null ) {
 834                 if ( $section === null ) {
 835                         $this->mFooter .= $msg;
 836                 } else {
 837                         if ( !isset( $this->mSectionFooters[$section] ) ) {
 838                                 $this->mSectionFooters[$section] = '';
 839                         }
 840                         $this->mSectionFooters[$section] .= $msg;
 841                 }
 842
 843                 return $this;
 844         }
 845
 846         /**
 847          * Set footer text, inside the form.
 848          * @since 1.19
 849          *
 850          * @param string $msg Complete text of message to display
 851          * @param string|null $section The section to add the footer text to
 852          *
 853          * @return HTMLForm $this for chaining calls (since 1.20)
 854          */
 855         public function setFooterText( $msg, $section = null ) {
 856                 if ( $section === null ) {
 857                         $this->mFooter = $msg;
 858                 } else {
 859                         $this->mSectionFooters[$section] = $msg;
 860                 }
 861
 862                 return $this;
 863         }
 864
 865         /**
 866          * Get footer text.
 867          *
 868          * @param string|null $section The section to get the footer text for
 869          * @since 1.26
 870          * @return string
 871          */
 872         public function getFooterText( $section = null ) {
 873                 if ( $section === null ) {
 874                         return $this->mFooter;
 875                 } else {
 876                         return $this->mSectionFooters[$section] ?? '';
 877                 }
 878         }
 879
 880         /**
 881          * Add text to the end of the display.
 882          *
 883          * @param string $msg Complete text of message to display
 884          *
 885          * @return HTMLForm $this for chaining calls (since 1.20)
 886          */
 887         public function addPostText( $msg ) {
 888                 $this->mPost .= $msg;
 889
 890                 return $this;
 891         }
 892
 893         /**
 894          * Set text at the end of the display.
 895          *
 896          * @param string $msg Complete text of message to display
 897          *
 898          * @return HTMLForm $this for chaining calls (since 1.20)
 899          */
 900         public function setPostText( $msg ) {
 901                 $this->mPost = $msg;
 902
 903                 return $this;
 904         }
 905
 906         /**
 907          * Add a hidden field to the output
 908          *
 909          * @param string $name Field name.  This will be used exactly as entered
 910          * @param string $value Field value
 911          * @param array $attribs
 912          *
 913          * @return HTMLForm $this for chaining calls (since 1.20)
 914          */
 915         public function addHiddenField( $name, $value, array $attribs = [] ) {
 916                 $attribs += [ 'name' => $name ];
 917                 $this->mHiddenFields[] = [ $value, $attribs ];
 918
 919                 return $this;
 920         }
 921
 922         /**
 923          * Add an array of hidden fields to the output
 924          *
 925          * @since 1.22
 926          *
 927          * @param array $fields Associative array of fields to add;
 928          *        mapping names to their values
 929          *
 930          * @return HTMLForm $this for chaining calls
 931          */
 932         public function addHiddenFields( array $fields ) {
 933                 foreach ( $fields as $name => $value ) {
 934                         $this->mHiddenFields[] = [ $value, [ 'name' => $name ] ];
 935                 }
 936
 937                 return $this;
 938         }
 939
 940         /**
 941          * Add a button to the form
 942          *
 943          * @since 1.27 takes an array as shown. Earlier versions accepted
 944          *  'name', 'value', 'id', and 'attribs' as separate parameters in that
 945          *  order.
 946          * @note Custom labels ('label', 'label-message', 'label-raw') are not
 947          *  supported for IE6 and IE7 due to bugs in those browsers. If detected,
 948          *  they will be served buttons using 'value' as the button label.
 949          * @param array $data Data to define the button:
 950          *  - name: (string) Button name.
 951          *  - value: (string) Button value.
 952          *  - label-message: (string, optional) Button label message key to use
 953          *    instead of 'value'. Overrides 'label' and 'label-raw'.
 954          *  - label: (string, optional) Button label text to use instead of
 955          *    'value'. Overrides 'label-raw'.
 956          *  - label-raw: (string, optional) Button label HTML to use instead of
 957          *    'value'.
 958          *  - id: (string, optional) DOM id for the button.
 959          *  - attribs: (array, optional) Additional HTML attributes.
 960          *  - flags: (string|string[], optional) OOUI flags.
 961          *  - framed: (boolean=true, optional) OOUI framed attribute.
 962          * @return HTMLForm $this for chaining calls (since 1.20)
 963          */
 964         public function addButton( $data ) {
 965                 if ( !is_array( $data ) ) {
 966                         $args = func_get_args();
 967                         if ( count( $args ) < 2 || count( $args ) > 4 ) {
 968                                 throw new InvalidArgumentException(
 969                                         'Incorrect number of arguments for deprecated calling style'
 970                                 );
 971                         }
 972                         $data = [
 973                                 'name' => $args[0],
 974                                 'value' => $args[1],
 975                                 'id' => $args[2] ?? null,
 976                                 'attribs' => $args[3] ?? null,
 977                         ];
 978                 } else {
 979                         if ( !isset( $data['name'] ) ) {
 980                                 throw new InvalidArgumentException( 'A name is required' );
 981                         }
 982                         if ( !isset( $data['value'] ) ) {
 983                                 throw new InvalidArgumentException( 'A value is required' );
 984                         }
 985                 }
 986                 $this->mButtons[] = $data + [
 987                         'id' => null,
 988                         'attribs' => null,
 989                         'flags' => null,
 990                         'framed' => true,
 991                 ];
 992
 993                 return $this;
 994         }
 995
 996         /**
 997          * Set the salt for the edit token.
 998          *
 999          * Only useful when the method is "post".
1000          *
1001          * @since 1.24
1002          * @param string|array $salt Salt to use
1003          * @return HTMLForm $this For chaining calls
1004          */
1005         public function setTokenSalt( $salt ) {
1006                 $this->mTokenSalt = $salt;
1007
1008                 return $this;
1009         }
1010
1011         /**
1012          * Display the form (sending to the context's OutputPage object), with an
1013          * appropriate error message or stack of messages, and any validation errors, etc.
1014          *
1015          * @warning You should call prepareForm() before calling this function.
1016          * Moreover, when doing method chaining this should be the very last method
1017          * call just after prepareForm().
1018          *
1019          * @param bool|string|array|Status $submitResult Output from HTMLForm::trySubmit()
1020          *
1021          * @return void Nothing, should be last call
1022          */
1023         public function displayForm( $submitResult ) {
1024                 $this->getOutput()->addHTML( $this->getHTML( $submitResult ) );
1025         }
1026
1027         /**
1028          * Returns the raw HTML generated by the form
1029          *
1030          * @param bool|string|array|Status $submitResult Output from HTMLForm::trySubmit()
1031          *
1032          * @return string HTML
1033          * @return-taint escaped
1034          */
1035         public function getHTML( $submitResult ) {
1036                 # For good measure (it is the default)
1037                 $this->getOutput()->preventClickjacking();
1038                 $this->getOutput()->addModules( 'mediawiki.htmlform' );
1039                 $this->getOutput()->addModuleStyles( 'mediawiki.htmlform.styles' );
1040
1041                 $html = ''
1042                         . $this->getErrorsOrWarnings( $submitResult, 'error' )
1043                         . $this->getErrorsOrWarnings( $submitResult, 'warning' )
1044                         . $this->getHeaderText()
1045                         . $this->getBody()
1046                         . $this->getHiddenFields()
1047                         . $this->getButtons()
1048                         . $this->getFooterText();
1049
1050                 $html = $this->wrapForm( $html );
1051
1052                 return '' . $this->mPre . $html . $this->mPost;
1053         }
1054
1055         /**
1056          * Get HTML attributes for the `<form>` tag.
1057          * @return array
1058          */
1059         protected function getFormAttributes() {
1060                 # Use multipart/form-data
1061                 $encType = $this->mUseMultipart
1062                         ? 'multipart/form-data'
1063                         : 'application/x-www-form-urlencoded';
1064                 # Attributes
1065                 $attribs = [
1066                         'class' => 'mw-htmlform',
1067                         'action' => $this->getAction(),
1068                         'method' => $this->getMethod(),
1069                         'enctype' => $encType,
1070                 ];
1071                 if ( $this->mId ) {
1072                         $attribs['id'] = $this->mId;
1073                 }
1074                 if ( is_string( $this->mAutocomplete ) ) {
1075                         $attribs['autocomplete'] = $this->mAutocomplete;
1076                 }
1077                 if ( $this->mName ) {
1078                         $attribs['name'] = $this->mName;
1079                 }
1080                 if ( $this->needsJSForHtml5FormValidation() ) {
1081                         $attribs['novalidate'] = true;
1082                 }
1083                 return $attribs;
1084         }
1085
1086         /**
1087          * Wrap the form innards in an actual "<form>" element
1088          *
1089          * @param string $html HTML contents to wrap.
1090          *
1091          * @return string Wrapped HTML.
1092          */
1093         public function wrapForm( $html ) {
1094                 # Include a <fieldset> wrapper for style, if requested.
1095                 if ( $this->mWrapperLegend !== false ) {
1096                         $legend = is_string( $this->mWrapperLegend ) ? $this->mWrapperLegend : false;
1097                         $html = Xml::fieldset( $legend, $html );
1098                 }
1099
1100                 return Html::rawElement(
1101                         'form',
1102                         $this->getFormAttributes(),
1103                         $html
1104                 );
1105         }
1106
1107         /**
1108          * Get the hidden fields that should go inside the form.
1109          * @return string HTML.
1110          */
1111         public function getHiddenFields() {
1112                 $html = '';
1113                 if ( $this->mFormIdentifier !== null ) {
1114                         $html .= Html::hidden(
1115                                 'wpFormIdentifier',
1116                                 $this->mFormIdentifier
1117                         ) . "\n";
1118                 }
1119                 if ( $this->getMethod() === 'post' ) {
1120                         $html .= Html::hidden(
1121                                 'wpEditToken',
1122                                 $this->getUser()->getEditToken( $this->mTokenSalt ),
1123                                 [ 'id' => 'wpEditToken' ]
1124                         ) . "\n";
1125                         $html .= Html::hidden( 'title', $this->getTitle()->getPrefixedText() ) . "\n";
1126                 }
1127
1128                 $articlePath = $this->getConfig()->get( 'ArticlePath' );
1129                 if ( strpos( $articlePath, '?' ) !== false && $this->getMethod() === 'get' ) {
1130                         $html .= Html::hidden( 'title', $this->getTitle()->getPrefixedText() ) . "\n";
1131                 }
1132
1133                 foreach ( $this->mHiddenFields as $data ) {
1134                         list( $value, $attribs ) = $data;
1135                         $html .= Html::hidden( $attribs['name'], $value, $attribs ) . "\n";
1136                 }
1137
1138                 return $html;
1139         }
1140
1141         /**
1142          * Get the submit and (potentially) reset buttons.
1143          * @return string HTML.
1144          */
1145         public function getButtons() {
1146                 $buttons = '';
1147                 $useMediaWikiUIEverywhere = $this->getConfig()->get( 'UseMediaWikiUIEverywhere' );
1148
1149                 if ( $this->mShowSubmit ) {
1150                         $attribs = [];
1151
1152                         if ( isset( $this->mSubmitID ) ) {
1153                                 $attribs['id'] = $this->mSubmitID;
1154                         }
1155
1156                         if ( isset( $this->mSubmitName ) ) {
1157                                 $attribs['name'] = $this->mSubmitName;
1158                         }
1159
1160                         if ( isset( $this->mSubmitTooltip ) ) {
1161                                 $attribs += Linker::tooltipAndAccesskeyAttribs( $this->mSubmitTooltip );
1162                         }
1163
1164                         $attribs['class'] = [ 'mw-htmlform-submit' ];
1165
1166                         if ( $useMediaWikiUIEverywhere ) {
1167                                 foreach ( $this->mSubmitFlags as $flag ) {
1168                                         $attribs['class'][] = 'mw-ui-' . $flag;
1169                                 }
1170                                 $attribs['class'][] = 'mw-ui-button';
1171                         }
1172
1173                         $buttons .= Xml::submitButton( $this->getSubmitText(), $attribs ) . "\n";
1174                 }
1175
1176                 if ( $this->mShowReset ) {
1177                         $buttons .= Html::element(
1178                                 'input',
1179                                 [
1180                                         'type' => 'reset',
1181                                         'value' => $this->msg( 'htmlform-reset' )->text(),
1182                                         'class' => $useMediaWikiUIEverywhere ? 'mw-ui-button' : null,
1183                                 ]
1184                         ) . "\n";
1185                 }
1186
1187                 if ( $this->mShowCancel ) {
1188                         $target = $this->mCancelTarget ?: Title::newMainPage();
1189                         if ( $target instanceof Title ) {
1190                                 $target = $target->getLocalURL();
1191                         }
1192                         $buttons .= Html::element(
1193                                         'a',
1194                                         [
1195                                                 'class' => $useMediaWikiUIEverywhere ? 'mw-ui-button' : null,
1196                                                 'href' => $target,
1197                                         ],
1198                                         $this->msg( 'cancel' )->text()
1199                                 ) . "\n";
1200                 }
1201
1202                 // IE<8 has bugs with <button>, so we'll need to avoid them.
1203                 $isBadIE = preg_match( '/MSIE [1-7]\./i', $this->getRequest()->getHeader( 'User-Agent' ) );
1204
1205                 foreach ( $this->mButtons as $button ) {
1206                         $attrs = [
1207                                 'type' => 'submit',
1208                                 'name' => $button['name'],
1209                                 'value' => $button['value']
1210                         ];
1211
1212                         if ( isset( $button['label-message'] ) ) {
1213                                 $label = $this->getMessage( $button['label-message'] )->parse();
1214                         } elseif ( isset( $button['label'] ) ) {
1215                                 $label = htmlspecialchars( $button['label'] );
1216                         } elseif ( isset( $button['label-raw'] ) ) {
1217                                 $label = $button['label-raw'];
1218                         } else {
1219                                 $label = htmlspecialchars( $button['value'] );
1220                         }
1221
1222                         if ( $button['attribs'] ) {
1223                                 $attrs += $button['attribs'];
1224                         }
1225
1226                         if ( isset( $button['id'] ) ) {
1227                                 $attrs['id'] = $button['id'];
1228                         }
1229
1230                         if ( $useMediaWikiUIEverywhere ) {
1231                                 $attrs['class'] = isset( $attrs['class'] ) ? (array)$attrs['class'] : [];
1232                                 $attrs['class'][] = 'mw-ui-button';
1233                         }
1234
1235                         if ( $isBadIE ) {
1236                                 $buttons .= Html::element( 'input', $attrs ) . "\n";
1237                         } else {
1238                                 $buttons .= Html::rawElement( 'button', $attrs, $label ) . "\n";
1239                         }
1240                 }
1241
1242                 if ( !$buttons ) {
1243                         return '';
1244                 }
1245
1246                 return Html::rawElement( 'span',
1247                         [ 'class' => 'mw-htmlform-submit-buttons' ], "\n$buttons" ) . "\n";
1248         }
1249
1250         /**
1251          * Get the whole body of the form.
1252          * @return string
1253          */
1254         public function getBody() {
1255                 return $this->displaySection( $this->mFieldTree, $this->mTableId );
1256         }
1257
1258         /**
1259          * Format and display an error message stack.
1260          *
1261          * @param string|array|Status $errors
1262          *
1263          * @deprecated since 1.28, use getErrorsOrWarnings() instead
1264          *
1265          * @return string
1266          */
1267         public function getErrors( $errors ) {
1268                 wfDeprecated( __METHOD__ );
1269                 return $this->getErrorsOrWarnings( $errors, 'error' );
1270         }
1271
1272         /**
1273          * Returns a formatted list of errors or warnings from the given elements.
1274          *
1275          * @param string|array|Status $elements The set of errors/warnings to process.
1276          * @param string $elementsType Should warnings or errors be returned.  This is meant
1277          *     for Status objects, all other valid types are always considered as errors.
1278          * @return string
1279          */
1280         public function getErrorsOrWarnings( $elements, $elementsType ) {
1281                 if ( !in_array( $elementsType, [ 'error', 'warning' ], true ) ) {
1282                         throw new DomainException( $elementsType . ' is not a valid type.' );
1283                 }
1284                 $elementstr = false;
1285                 if ( $elements instanceof Status ) {
1286                         list( $errorStatus, $warningStatus ) = $elements->splitByErrorType();
1287                         $status = $elementsType === 'error' ? $errorStatus : $warningStatus;
1288                         if ( $status->isGood() ) {
1289                                 $elementstr = '';
1290                         } else {
1291                                 $elementstr = $this->getOutput()->parse(
1292                                         $status->getWikiText()
1293                                 );
1294                         }
1295                 } elseif ( is_array( $elements ) && $elementsType === 'error' ) {
1296                         $elementstr = $this->formatErrors( $elements );
1297                 } elseif ( $elementsType === 'error' ) {
1298                         $elementstr = $elements;
1299                 }
1300
1301                 return $elementstr
1302                         ? Html::rawElement( 'div', [ 'class' => $elementsType ], $elementstr )
1303                         : '';
1304         }
1305
1306         /**
1307          * Format a stack of error messages into a single HTML string
1308          *
1309          * @param array $errors Array of message keys/values
1310          *
1311          * @return string HTML, a "<ul>" list of errors
1312          */
1313         public function formatErrors( $errors ) {
1314                 $errorstr = '';
1315
1316                 foreach ( $errors as $error ) {
1317                         $errorstr .= Html::rawElement(
1318                                 'li',
1319                                 [],
1320                                 $this->getMessage( $error )->parse()
1321                         );
1322                 }
1323
1324                 $errorstr = Html::rawElement( 'ul', [], $errorstr );
1325
1326                 return $errorstr;
1327         }
1328
1329         /**
1330          * Set the text for the submit button
1331          *
1332          * @param string $t Plaintext
1333          *
1334          * @return HTMLForm $this for chaining calls (since 1.20)
1335          */
1336         public function setSubmitText( $t ) {
1337                 $this->mSubmitText = $t;
1338
1339                 return $this;
1340         }
1341
1342         /**
1343          * Identify that the submit button in the form has a destructive action
1344          * @since 1.24
1345          *
1346          * @return HTMLForm $this for chaining calls (since 1.28)
1347          */
1348         public function setSubmitDestructive() {
1349                 $this->mSubmitFlags = [ 'destructive', 'primary' ];
1350
1351                 return $this;
1352         }
1353
1354         /**
1355          * Identify that the submit button in the form has a progressive action
1356          * @since 1.25
1357          * @deprecated since 1.32, No need to call. Submit button already
1358          * has a progressive action form.
1359          *
1360          * @return HTMLForm $this for chaining calls (since 1.28)
1361          */
1362         public function setSubmitProgressive() {
1363                 wfDeprecated( __METHOD__, '1.32' );
1364                 $this->mSubmitFlags = [ 'progressive', 'primary' ];
1365
1366                 return $this;
1367         }
1368
1369         /**
1370          * Set the text for the submit button to a message
1371          * @since 1.19
1372          *
1373          * @param string|Message $msg Message key or Message object
1374          *
1375          * @return HTMLForm $this for chaining calls (since 1.20)
1376          */
1377         public function setSubmitTextMsg( $msg ) {
1378                 if ( !$msg instanceof Message ) {
1379                         $msg = $this->msg( $msg );
1380                 }
1381                 $this->setSubmitText( $msg->text() );
1382
1383                 return $this;
1384         }
1385
1386         /**
1387          * Get the text for the submit button, either customised or a default.
1388          * @return string
1389          */
1390         public function getSubmitText() {
1391                 return $this->mSubmitText ?: $this->msg( 'htmlform-submit' )->text();
1392         }
1393
1394         /**
1395          * @param string $name Submit button name
1396          *
1397          * @return HTMLForm $this for chaining calls (since 1.20)
1398          */
1399         public function setSubmitName( $name ) {
1400                 $this->mSubmitName = $name;
1401
1402                 return $this;
1403         }
1404
1405         /**
1406          * @param string $name Tooltip for the submit button
1407          *
1408          * @return HTMLForm $this for chaining calls (since 1.20)
1409          */
1410         public function setSubmitTooltip( $name ) {
1411                 $this->mSubmitTooltip = $name;
1412
1413                 return $this;
1414         }
1415
1416         /**
1417          * Set the id for the submit button.
1418          *
1419          * @param string $t
1420          *
1421          * @todo FIXME: Integrity of $t is *not* validated
1422          * @return HTMLForm $this for chaining calls (since 1.20)
1423          */
1424         public function setSubmitID( $t ) {
1425                 $this->mSubmitID = $t;
1426
1427                 return $this;
1428         }
1429
1430         /**
1431          * Set an internal identifier for this form. It will be submitted as a hidden form field, allowing
1432          * HTMLForm to determine whether the form was submitted (or merely viewed). Setting this serves
1433          * two purposes:
1434          *
1435          * - If you use two or more forms on one page, it allows HTMLForm to identify which of the forms
1436          *   was submitted, and not attempt to validate the other ones.
1437          * - If you use checkbox or multiselect fields inside a form using the GET method, it allows
1438          *   HTMLForm to distinguish between the initial page view and a form submission with all
1439          *   checkboxes or select options unchecked.
1440          *
1441          * @since 1.28
1442          * @param string $ident
1443          * @return $this
1444          */
1445         public function setFormIdentifier( $ident ) {
1446                 $this->mFormIdentifier = $ident;
1447
1448                 return $this;
1449         }
1450
1451         /**
1452          * Stop a default submit button being shown for this form. This implies that an
1453          * alternate submit method must be provided manually.
1454          *
1455          * @since 1.22
1456          *
1457          * @param bool $suppressSubmit Set to false to re-enable the button again
1458          *
1459          * @return HTMLForm $this for chaining calls
1460          */
1461         public function suppressDefaultSubmit( $suppressSubmit = true ) {
1462                 $this->mShowSubmit = !$suppressSubmit;
1463
1464                 return $this;
1465         }
1466
1467         /**
1468          * Show a cancel button (or prevent it). The button is not shown by default.
1469          * @param bool $show
1470          * @return HTMLForm $this for chaining calls
1471          * @since 1.27
1472          */
1473         public function showCancel( $show = true ) {
1474                 $this->mShowCancel = $show;
1475                 return $this;
1476         }
1477
1478         /**
1479          * Sets the target where the user is redirected to after clicking cancel.
1480          * @param Title|string $target Target as a Title object or an URL
1481          * @return HTMLForm $this for chaining calls
1482          * @since 1.27
1483          */
1484         public function setCancelTarget( $target ) {
1485                 $this->mCancelTarget = $target;
1486                 return $this;
1487         }
1488
1489         /**
1490          * Set the id of the \<table\> or outermost \<div\> element.
1491          *
1492          * @since 1.22
1493          *
1494          * @param string $id New value of the id attribute, or "" to remove
1495          *
1496          * @return HTMLForm $this for chaining calls
1497          */
1498         public function setTableId( $id ) {
1499                 $this->mTableId = $id;
1500
1501                 return $this;
1502         }
1503
1504         /**
1505          * @param string $id DOM id for the form
1506          *
1507          * @return HTMLForm $this for chaining calls (since 1.20)
1508          */
1509         public function setId( $id ) {
1510                 $this->mId = $id;
1511
1512                 return $this;
1513         }
1514
1515         /**
1516          * @param string $name 'name' attribute for the form
1517          * @return HTMLForm $this for chaining calls
1518          */
1519         public function setName( $name ) {
1520                 $this->mName = $name;
1521
1522                 return $this;
1523         }
1524
1525         /**
1526          * Prompt the whole form to be wrapped in a "<fieldset>", with
1527          * this text as its "<legend>" element.
1528          *
1529          * @param string|bool $legend If false, no wrapper or legend will be displayed.
1530          *     If true, a wrapper will be displayed, but no legend.
1531          *     If a string, a wrapper will be displayed with that string as a legend.
1532          *     The string will be escaped before being output (this doesn't support HTML).
1533          *
1534          * @return HTMLForm $this for chaining calls (since 1.20)
1535          */
1536         public function setWrapperLegend( $legend ) {
1537                 $this->mWrapperLegend = $legend;
1538
1539                 return $this;
1540         }
1541
1542         /**
1543          * Prompt the whole form to be wrapped in a "<fieldset>", with
1544          * this message as its "<legend>" element.
1545          * @since 1.19
1546          *
1547          * @param string|Message $msg Message key or Message object
1548          *
1549          * @return HTMLForm $this for chaining calls (since 1.20)
1550          */
1551         public function setWrapperLegendMsg( $msg ) {
1552                 if ( !$msg instanceof Message ) {
1553                         $msg = $this->msg( $msg );
1554                 }
1555                 $this->setWrapperLegend( $msg->text() );
1556
1557                 return $this;
1558         }
1559
1560         /**
1561          * Set the prefix for various default messages
1562          * @todo Currently only used for the "<fieldset>" legend on forms
1563          * with multiple sections; should be used elsewhere?
1564          *
1565          * @param string $p
1566          *
1567          * @return HTMLForm $this for chaining calls (since 1.20)
1568          */
1569         public function setMessagePrefix( $p ) {
1570                 $this->mMessagePrefix = $p;
1571
1572                 return $this;
1573         }
1574
1575         /**
1576          * Set the title for form submission
1577          *
1578          * @param Title $t Title of page the form is on/should be posted to
1579          *
1580          * @return HTMLForm $this for chaining calls (since 1.20)
1581          */
1582         public function setTitle( $t ) {
1583                 $this->mTitle = $t;
1584
1585                 return $this;
1586         }
1587
1588         /**
1589          * Get the title
1590          * @return Title
1591          */
1592         public function getTitle() {
1593                 return $this->mTitle === false
1594                         ? $this->getContext()->getTitle()
1595                         : $this->mTitle;
1596         }
1597
1598         /**
1599          * Set the method used to submit the form
1600          *
1601          * @param string $method
1602          *
1603          * @return HTMLForm $this for chaining calls (since 1.20)
1604          */
1605         public function setMethod( $method = 'post' ) {
1606                 $this->mMethod = strtolower( $method );
1607
1608                 return $this;
1609         }
1610
1611         /**
1612          * @return string Always lowercase
1613          */
1614         public function getMethod() {
1615                 return $this->mMethod;
1616         }
1617
1618         /**
1619          * Wraps the given $section into an user-visible fieldset.
1620          *
1621          * @param string $legend Legend text for the fieldset
1622          * @param string $section The section content in plain Html
1623          * @param array $attributes Additional attributes for the fieldset
1624          * @param bool $isRoot Section is at the root of the tree
1625          * @return string The fieldset's Html
1626          */
1627         protected function wrapFieldSetSection( $legend, $section, $attributes, $isRoot ) {
1628                 return Xml::fieldset( $legend, $section, $attributes ) . "\n";
1629         }
1630
1631         /**
1632          * @todo Document
1633          *
1634          * @param array[]|HTMLFormField[] $fields Array of fields (either arrays or
1635          *   objects).
1636          * @param string $sectionName ID attribute of the "<table>" tag for this
1637          *   section, ignored if empty.
1638          * @param string $fieldsetIDPrefix ID prefix for the "<fieldset>" tag of
1639          *   each subsection, ignored if empty.
1640          * @param bool &$hasUserVisibleFields Whether the section had user-visible fields.
1641          * @throws LogicException When called on uninitialized field data, e.g. When
1642          *  HTMLForm::displayForm was called without calling HTMLForm::prepareForm
1643          *  first.
1644          *
1645          * @return string
1646          */
1647         public function displaySection( $fields,
1648                 $sectionName = '',
1649                 $fieldsetIDPrefix = '',
1650                 &$hasUserVisibleFields = false
1651         ) {
1652                 if ( $this->mFieldData === null ) {
1653                         throw new LogicException( 'HTMLForm::displaySection() called on uninitialized field data. '
1654                                 . 'You probably called displayForm() without calling prepareForm() first.' );
1655                 }
1656
1657                 $displayFormat = $this->getDisplayFormat();
1658
1659                 $html = [];
1660                 $subsectionHtml = '';
1661                 $hasLabel = false;
1662
1663                 // Conveniently, PHP method names are case-insensitive.
1664                 // For grep: this can call getDiv, getRaw, getInline, getVForm, getOOUI
1665                 $getFieldHtmlMethod = $displayFormat === 'table' ? 'getTableRow' : ( 'get' . $displayFormat );
1666
1667                 foreach ( $fields as $key => $value ) {
1668                         if ( $value instanceof HTMLFormField ) {
1669                                 $v = array_key_exists( $key, $this->mFieldData )
1670                                         ? $this->mFieldData[$key]
1671                                         : $value->getDefault();
1672
1673                                 $retval = $value->$getFieldHtmlMethod( $v );
1674
1675                                 // check, if the form field should be added to
1676                                 // the output.
1677                                 if ( $value->hasVisibleOutput() ) {
1678                                         $html[] = $retval;
1679
1680                                         $labelValue = trim( $value->getLabel() );
1681                                         if ( $labelValue !== "\u{00A0}" && $labelValue !== '&#160;' && $labelValue !== '' ) {
1682                                                 $hasLabel = true;
1683                                         }
1684
1685                                         $hasUserVisibleFields = true;
1686                                 }
1687                         } elseif ( is_array( $value ) ) {
1688                                 $subsectionHasVisibleFields = false;
1689                                 $section =
1690                                         $this->displaySection( $value,
1691                                                 "mw-htmlform-$key",
1692                                                 "$fieldsetIDPrefix$key-",
1693                                                 $subsectionHasVisibleFields );
1694                                 $legend = null;
1695
1696                                 if ( $subsectionHasVisibleFields === true ) {
1697                                         // Display the section with various niceties.
1698                                         $hasUserVisibleFields = true;
1699
1700                                         $legend = $this->getLegend( $key );
1701
1702                                         $section = $this->getHeaderText( $key ) .
1703                                                 $section .
1704                                                 $this->getFooterText( $key );
1705
1706                                         $attributes = [];
1707                                         if ( $fieldsetIDPrefix ) {
1708                                                 $attributes['id'] = Sanitizer::escapeIdForAttribute( "$fieldsetIDPrefix$key" );
1709                                         }
1710                                         $subsectionHtml .= $this->wrapFieldSetSection(
1711                                                 $legend, $section, $attributes, $fields === $this->mFieldTree
1712                                         );
1713                                 } else {
1714                                         // Just return the inputs, nothing fancy.
1715                                         $subsectionHtml .= $section;
1716                                 }
1717                         }
1718                 }
1719
1720                 $html = $this->formatSection( $html, $sectionName, $hasLabel );
1721
1722                 if ( $subsectionHtml ) {
1723                         if ( $this->mSubSectionBeforeFields ) {
1724                                 return $subsectionHtml . "\n" . $html;
1725                         } else {
1726                                 return $html . "\n" . $subsectionHtml;
1727                         }
1728                 } else {
1729                         return $html;
1730                 }
1731         }
1732
1733         /**
1734          * Put a form section together from the individual fields' HTML, merging it and wrapping.
1735          * @param array $fieldsHtml
1736          * @param string $sectionName
1737          * @param bool $anyFieldHasLabel
1738          * @return string HTML
1739          */
1740         protected function formatSection( array $fieldsHtml, $sectionName, $anyFieldHasLabel ) {
1741                 if ( !$fieldsHtml ) {
1742                         // Do not generate any wrappers for empty sections. Sections may be empty if they only have
1743                         // subsections, but no fields. A legend will still be added in wrapFieldSetSection().
1744                         return '';
1745                 }
1746
1747                 $displayFormat = $this->getDisplayFormat();
1748                 $html = implode( '', $fieldsHtml );
1749
1750                 if ( $displayFormat === 'raw' ) {
1751                         return $html;
1752                 }
1753
1754                 $classes = [];
1755
1756                 if ( !$anyFieldHasLabel ) { // Avoid strange spacing when no labels exist
1757                         $classes[] = 'mw-htmlform-nolabel';
1758                 }
1759
1760                 $attribs = [
1761                         'class' => implode( ' ', $classes ),
1762                 ];
1763
1764                 if ( $sectionName ) {
1765                         $attribs['id'] = Sanitizer::escapeIdForAttribute( $sectionName );
1766                 }
1767
1768                 if ( $displayFormat === 'table' ) {
1769                         return Html::rawElement( 'table',
1770                                         $attribs,
1771                                         Html::rawElement( 'tbody', [], "\n$html\n" ) ) . "\n";
1772                 } elseif ( $displayFormat === 'inline' ) {
1773                         return Html::rawElement( 'span', $attribs, "\n$html\n" );
1774                 } else {
1775                         return Html::rawElement( 'div', $attribs, "\n$html\n" );
1776                 }
1777         }
1778
1779         /**
1780          * Construct the form fields from the Descriptor array
1781          */
1782         public function loadData() {
1783                 $fieldData = [];
1784
1785                 foreach ( $this->mFlatFields as $fieldname => $field ) {
1786                         $request = $this->getRequest();
1787                         if ( $field->skipLoadData( $request ) ) {
1788                                 continue;
1789                         } elseif ( !empty( $field->mParams['disabled'] ) ) {
1790                                 $fieldData[$fieldname] = $field->getDefault();
1791                         } else {
1792                                 $fieldData[$fieldname] = $field->loadDataFromRequest( $request );
1793                         }
1794                 }
1795
1796                 # Filter data.
1797                 foreach ( $fieldData as $name => &$value ) {
1798                         $field = $this->mFlatFields[$name];
1799                         $value = $field->filter( $value, $this->mFlatFields );
1800                 }
1801
1802                 $this->mFieldData = $fieldData;
1803         }
1804
1805         /**
1806          * Stop a reset button being shown for this form
1807          *
1808          * @param bool $suppressReset Set to false to re-enable the button again
1809          *
1810          * @return HTMLForm $this for chaining calls (since 1.20)
1811          */
1812         public function suppressReset( $suppressReset = true ) {
1813                 $this->mShowReset = !$suppressReset;
1814
1815                 return $this;
1816         }
1817
1818         /**
1819          * Overload this if you want to apply special filtration routines
1820          * to the form as a whole, after it's submitted but before it's
1821          * processed.
1822          *
1823          * @param array $data
1824          *
1825          * @return array
1826          */
1827         public function filterDataForSubmit( $data ) {
1828                 return $data;
1829         }
1830
1831         /**
1832          * Get a string to go in the "<legend>" of a section fieldset.
1833          * Override this if you want something more complicated.
1834          *
1835          * @param string $key
1836          *
1837          * @return string Plain text (not HTML-escaped)
1838          */
1839         public function getLegend( $key ) {
1840                 return $this->msg( "{$this->mMessagePrefix}-$key" )->text();
1841         }
1842
1843         /**
1844          * Set the value for the action attribute of the form.
1845          * When set to false (which is the default state), the set title is used.
1846          *
1847          * @since 1.19
1848          *
1849          * @param string|bool $action
1850          *
1851          * @return HTMLForm $this for chaining calls (since 1.20)
1852          */
1853         public function setAction( $action ) {
1854                 $this->mAction = $action;
1855
1856                 return $this;
1857         }
1858
1859         /**
1860          * Get the value for the action attribute of the form.
1861          *
1862          * @since 1.22
1863          *
1864          * @return string
1865          */
1866         public function getAction() {
1867                 // If an action is alredy provided, return it
1868                 if ( $this->mAction !== false ) {
1869                         return $this->mAction;
1870                 }
1871
1872                 $articlePath = $this->getConfig()->get( 'ArticlePath' );
1873                 // Check whether we are in GET mode and the ArticlePath contains a "?"
1874                 // meaning that getLocalURL() would return something like "index.php?title=...".
1875                 // As browser remove the query string before submitting GET forms,
1876                 // it means that the title would be lost. In such case use wfScript() instead
1877                 // and put title in an hidden field (see getHiddenFields()).
1878                 if ( strpos( $articlePath, '?' ) !== false && $this->getMethod() === 'get' ) {
1879                         return wfScript();
1880                 }
1881
1882                 return $this->getTitle()->getLocalURL();
1883         }
1884
1885         /**
1886          * Set the value for the autocomplete attribute of the form. A typical value is "off".
1887          * When set to null (which is the default state), the attribute get not set.
1888          *
1889          * @since 1.27
1890          *
1891          * @param string|null $autocomplete
1892          *
1893          * @return HTMLForm $this for chaining calls
1894          */
1895         public function setAutocomplete( $autocomplete ) {
1896                 $this->mAutocomplete = $autocomplete;
1897
1898                 return $this;
1899         }
1900
1901         /**
1902          * Turns a *-message parameter (which could be a MessageSpecifier, or a message name, or a
1903          * name + parameters array) into a Message.
1904          * @param mixed $value
1905          * @return Message
1906          */
1907         protected function getMessage( $value ) {
1908                 return Message::newFromSpecifier( $value )->setContext( $this );
1909         }
1910
1911         /**
1912          * Whether this form, with its current fields, requires the user agent to have JavaScript enabled
1913          * for the client-side HTML5 form validation to work correctly. If this function returns true, a
1914          * 'novalidate' attribute will be added on the `<form>` element. It will be removed if the user
1915          * agent has JavaScript support, in htmlform.js.
1916          *
1917          * @return bool
1918          * @since 1.29
1919          */
1920         public function needsJSForHtml5FormValidation() {
1921                 foreach ( $this->mFlatFields as $fieldname => $field ) {
1922                         if ( $field->needsJSForHtml5FormValidation() ) {
1923                                 return true;
1924                         }
1925                 }
1926                 return false;
1927         }
1928 }