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