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 /**
  25  * Object handling generic submission, CSRF protection, layout and
  26  * other logic for UI forms. in a reusable manner.
  27  *
  28  * In order to generate the form, the HTMLForm object takes an array
  29  * structure detailing the form fields available. Each element of the
  30  * array is a basic property-list, including the type of field, the
  31  * label it is to be given in the form, callbacks for validation and
  32  * 'filtering', and other pertinent information.
  33  *
  34  * Field types are implemented as subclasses of the generic HTMLFormField
  35  * object, and typically implement at least getInputHTML, which generates
  36  * the HTML for the input field to be placed in the table.
  37  *
  38  * You can find extensive documentation on the www.mediawiki.org wiki:
  39  *  - https://www.mediawiki.org/wiki/HTMLForm
  40  *  - https://www.mediawiki.org/wiki/HTMLForm/tutorial
  41  *
  42  * The constructor input is an associative array of $fieldname => $info,
  43  * where $info is an Associative Array with any of the following:
  44  *
  45  *    'class'               -- the subclass of HTMLFormField that will be used
  46  *                             to create the object.  *NOT* the CSS class!
  47  *    'type'                -- roughly translates into the <select> type attribute.
  48  *                             if 'class' is not specified, this is used as a map
  49  *                             through HTMLForm::$typeMappings to get the class name.
  50  *    'default'             -- default value when the form is displayed
  51  *    'id'                  -- HTML id attribute
  52  *    'cssclass'            -- CSS class
  53  *    'csshelpclass'        -- CSS class used to style help text
  54  *    'options'             -- associative array mapping labels to values.
  55  *                             Some field types support multi-level arrays.
  56  *    'options-messages'    -- associative array mapping message keys to values.
  57  *                             Some field types support multi-level arrays.
  58  *    'options-message'     -- message key to be parsed to extract the list of
  59  *                             options (like 'ipbreason-dropdown').
  60  *    'label-message'       -- message key for a message to use as the label.
  61  *                             can be an array of msg key and then parameters to
  62  *                             the message.
  63  *    'label'               -- alternatively, a raw text message. Overridden by
  64  *                             label-message
  65  *    'help'                -- message text for a message to use as a help text.
  66  *    'help-message'        -- message key for a message to use as a help text.
  67  *                             can be an array of msg key and then parameters to
  68  *                             the message.
  69  *                             Overwrites 'help-messages' and 'help'.
  70  *    'help-messages'       -- array of message key. As above, each item can
  71  *                             be an array of msg key and then parameters.
  72  *                             Overwrites 'help'.
  73  *    'required'            -- passed through to the object, indicating that it
  74  *                             is a required field.
  75  *    'size'                -- the length of text fields
  76  *    'filter-callback      -- a function name to give you the chance to
  77  *                             massage the inputted value before it's processed.
  78  *                             @see HTMLForm::filter()
  79  *    'validation-callback' -- a function name to give you the chance
  80  *                             to impose extra validation on the field input.
  81  *                             @see HTMLForm::validate()
  82  *    'name'                -- By default, the 'name' attribute of the input field
  83  *                             is "wp{$fieldname}".  If you want a different name
  84  *                             (eg one without the "wp" prefix), specify it here and
  85  *                             it will be used without modification.
  86  *
  87  * Since 1.20, you can chain mutators to ease the form generation:
  88  * @par Example:
  89  * @code
  90  * $form = new HTMLForm( $someFields );
  91  * $form->setMethod( 'get' )
  92  *      ->setWrapperLegendMsg( 'message-key' )
  93  *      ->prepareForm()
  94  *      ->displayForm( '' );
  95  * @endcode
  96  * Note that you will have prepareForm and displayForm at the end. Other
  97  * methods call done after that would simply not be part of the form :(
  98  *
  99  * @todo Document 'section' / 'subsection' stuff
 100  */
 101 class HTMLForm extends ContextSource {
 102         // A mapping of 'type' inputs onto standard HTMLFormField subclasses
 103         public static $typeMappings = array(
 104                 'api' => 'HTMLApiField',
 105                 'text' => 'HTMLTextField',
 106                 'textarea' => 'HTMLTextAreaField',
 107                 'select' => 'HTMLSelectField',
 108                 'radio' => 'HTMLRadioField',
 109                 'multiselect' => 'HTMLMultiSelectField',
 110                 'check' => 'HTMLCheckField',
 111                 'toggle' => 'HTMLCheckField',
 112                 'int' => 'HTMLIntField',
 113                 'float' => 'HTMLFloatField',
 114                 'info' => 'HTMLInfoField',
 115                 'selectorother' => 'HTMLSelectOrOtherField',
 116                 'selectandother' => 'HTMLSelectAndOtherField',
 117                 'submit' => 'HTMLSubmitField',
 118                 'hidden' => 'HTMLHiddenField',
 119                 'edittools' => 'HTMLEditTools',
 120                 'checkmatrix' => 'HTMLCheckMatrix',
 121                 'cloner' => 'HTMLFormFieldCloner',
 122                 // HTMLTextField will output the correct type="" attribute automagically.
 123                 // There are about four zillion other HTML5 input types, like range, but
 124                 // we don't use those at the moment, so no point in adding all of them.
 125                 'email' => 'HTMLTextField',
 126                 'password' => 'HTMLTextField',
 127                 'url' => 'HTMLTextField',
 128         );
 129
 130         public $mFieldData;
 131
 132         protected $mMessagePrefix;
 133
 134         /** @var HTMLFormField[] */
 135         protected $mFlatFields;
 136
 137         protected $mFieldTree;
 138         protected $mShowReset = false;
 139         protected $mShowSubmit = true;
 140
 141         protected $mSubmitCallback;
 142         protected $mValidationErrorMessage;
 143
 144         protected $mPre = '';
 145         protected $mHeader = '';
 146         protected $mFooter = '';
 147         protected $mSectionHeaders = array();
 148         protected $mSectionFooters = array();
 149         protected $mPost = '';
 150         protected $mId;
 151         protected $mTableId = '';
 152
 153         protected $mSubmitID;
 154         protected $mSubmitName;
 155         protected $mSubmitText;
 156         protected $mSubmitTooltip;
 157
 158         protected $mTitle;
 159         protected $mMethod = 'post';
 160         protected $mWasSubmitted = false;
 161
 162         /**
 163          * Form action URL. false means we will use the URL to set Title
 164          * @since 1.19
 165          * @var bool|string
 166          */
 167         protected $mAction = false;
 168
 169         protected $mUseMultipart = false;
 170         protected $mHiddenFields = array();
 171         protected $mButtons = array();
 172
 173         protected $mWrapperLegend = false;
 174
 175         /**
 176          * Salt for the edit token.
 177          * @var string|array
 178          */
 179         protected $mTokenSalt = '';
 180
 181         /**
 182          * If true, sections that contain both fields and subsections will
 183          * render their subsections before their fields.
 184          *
 185          * Subclasses may set this to false to render subsections after fields
 186          * instead.
 187          */
 188         protected $mSubSectionBeforeFields = true;
 189
 190         /**
 191          * Format in which to display form. For viable options,
 192          * @see $availableDisplayFormats
 193          * @var string
 194          */
 195         protected $displayFormat = 'table';
 196
 197         /**
 198          * Available formats in which to display the form
 199          * @var array
 200          */
 201         protected $availableDisplayFormats = array(
 202                 'table',
 203                 'div',
 204                 'raw',
 205                 'vform',
 206         );
 207
 208         /**
 209          * Build a new HTMLForm from an array of field attributes
 210          *
 211          * @param array $descriptor Array of Field constructs, as described above
 212          * @param IContextSource $context Available since 1.18, will become compulsory in 1.18.
 213          *     Obviates the need to call $form->setTitle()
 214          * @param string $messagePrefix A prefix to go in front of default messages
 215          */
 216         public function __construct( $descriptor, /*IContextSource*/ $context = null,
 217                 $messagePrefix = ''
 218         ) {
 219                 if ( $context instanceof IContextSource ) {
 220                         $this->setContext( $context );
 221                         $this->mTitle = false; // We don't need them to set a title
 222                         $this->mMessagePrefix = $messagePrefix;
 223                 } elseif ( is_null( $context ) && $messagePrefix !== '' ) {
 224                         $this->mMessagePrefix = $messagePrefix;
 225                 } elseif ( is_string( $context ) && $messagePrefix === '' ) {
 226                         // B/C since 1.18
 227                         // it's actually $messagePrefix
 228                         $this->mMessagePrefix = $context;
 229                 }
 230
 231                 // Expand out into a tree.
 232                 $loadedDescriptor = array();
 233                 $this->mFlatFields = array();
 234
 235                 foreach ( $descriptor as $fieldname => $info ) {
 236                         $section = isset( $info['section'] )
 237                                 ? $info['section']
 238                                 : '';
 239
 240                         if ( isset( $info['type'] ) && $info['type'] == 'file' ) {
 241                                 $this->mUseMultipart = true;
 242                         }
 243
 244                         $field = self::loadInputFromParameters( $fieldname, $info );
 245                         // FIXME During field's construct, the parent form isn't available!
 246                         // could add a 'parent' name-value to $info, could add a third parameter.
 247                         $field->mParent = $this;
 248
 249                         // vform gets too much space if empty labels generate HTML.
 250                         if ( $this->isVForm() ) {
 251                                 $field->setShowEmptyLabel( false );
 252                         }
 253
 254                         $setSection =& $loadedDescriptor;
 255                         if ( $section ) {
 256                                 $sectionParts = explode( '/', $section );
 257
 258                                 while ( count( $sectionParts ) ) {
 259                                         $newName = array_shift( $sectionParts );
 260
 261                                         if ( !isset( $setSection[$newName] ) ) {
 262                                                 $setSection[$newName] = array();
 263                                         }
 264
 265                                         $setSection =& $setSection[$newName];
 266                                 }
 267                         }
 268
 269                         $setSection[$fieldname] = $field;
 270                         $this->mFlatFields[$fieldname] = $field;
 271                 }
 272
 273                 $this->mFieldTree = $loadedDescriptor;
 274         }
 275
 276         /**
 277          * Set format in which to display the form
 278          *
 279          * @param string $format The name of the format to use, must be one of
 280          *   $this->availableDisplayFormats
 281          *
 282          * @throws MWException
 283          * @since 1.20
 284          * @return HTMLForm $this for chaining calls (since 1.20)
 285          */
 286         public function setDisplayFormat( $format ) {
 287                 if ( !in_array( $format, $this->availableDisplayFormats ) ) {
 288                         throw new MWException( 'Display format must be one of ' .
 289                                 print_r( $this->availableDisplayFormats, true ) );
 290                 }
 291                 $this->displayFormat = $format;
 292
 293                 return $this;
 294         }
 295
 296         /**
 297          * Getter for displayFormat
 298          * @since 1.20
 299          * @return string
 300          */
 301         public function getDisplayFormat() {
 302                 return $this->displayFormat;
 303         }
 304
 305         /**
 306          * Test if displayFormat is 'vform'
 307          * @since 1.22
 308          * @return bool
 309          */
 310         public function isVForm() {
 311                 return $this->displayFormat === 'vform';
 312         }
 313
 314         /**
 315          * Get the HTMLFormField subclass for this descriptor.
 316          *
 317          * The descriptor can be passed either 'class' which is the name of
 318          * a HTMLFormField subclass, or a shorter 'type' which is an alias.
 319          * This makes sure the 'class' is always set, and also is returned by
 320          * this function for ease.
 321          *
 322          * @since 1.23
 323          *
 324          * @param string $fieldname Name of the field
 325          * @param array $descriptor Input Descriptor, as described above
 326          *
 327          * @throws MWException
 328          * @return string Name of a HTMLFormField subclass
 329          */
 330         public static function getClassFromDescriptor( $fieldname, &$descriptor ) {
 331                 if ( isset( $descriptor['class'] ) ) {
 332                         $class = $descriptor['class'];
 333                 } elseif ( isset( $descriptor['type'] ) ) {
 334                         $class = self::$typeMappings[$descriptor['type']];
 335                         $descriptor['class'] = $class;
 336                 } else {
 337                         $class = null;
 338                 }
 339
 340                 if ( !$class ) {
 341                         throw new MWException( "Descriptor with no class for $fieldname: "
 342                                 . print_r( $descriptor, true ) );
 343                 }
 344
 345                 return $class;
 346         }
 347
 348         /**
 349          * Initialise a new Object for the field
 350          *
 351          * @param string $fieldname Name of the field
 352          * @param array $descriptor Input Descriptor, as described above
 353          *
 354          * @throws MWException
 355          * @return HTMLFormField Instance of a subclass of HTMLFormField
 356          */
 357         public static function loadInputFromParameters( $fieldname, $descriptor ) {
 358                 $class = self::getClassFromDescriptor( $fieldname, $descriptor );
 359
 360                 $descriptor['fieldname'] = $fieldname;
 361
 362                 # @todo This will throw a fatal error whenever someone try to use
 363                 # 'class' to feed a CSS class instead of 'cssclass'. Would be
 364                 # great to avoid the fatal error and show a nice error.
 365                 $obj = new $class( $descriptor );
 366
 367                 return $obj;
 368         }
 369
 370         /**
 371          * Prepare form for submission.
 372          *
 373          * @attention When doing method chaining, that should be the very last
 374          * method call before displayForm().
 375          *
 376          * @throws MWException
 377          * @return HTMLForm $this for chaining calls (since 1.20)
 378          */
 379         function prepareForm() {
 380                 # Check if we have the info we need
 381                 if ( !$this->mTitle instanceof Title && $this->mTitle !== false ) {
 382                         throw new MWException( "You must call setTitle() on an HTMLForm" );
 383                 }
 384
 385                 # Load data from the request.
 386                 $this->loadData();
 387
 388                 return $this;
 389         }
 390
 391         /**
 392          * Try submitting, with edit token check first
 393          * @return Status|bool
 394          */
 395         function tryAuthorizedSubmit() {
 396                 $result = false;
 397
 398                 $submit = false;
 399                 if ( $this->getMethod() != 'post' ) {
 400                         $submit = true; // no session check needed
 401                 } elseif ( $this->getRequest()->wasPosted() ) {
 402                         $editToken = $this->getRequest()->getVal( 'wpEditToken' );
 403                         if ( $this->getUser()->isLoggedIn() || $editToken != null ) {
 404                                 // Session tokens for logged-out users have no security value.
 405                                 // However, if the user gave one, check it in order to give a nice
 406                                 // "session expired" error instead of "permission denied" or such.
 407                                 $submit = $this->getUser()->matchEditToken( $editToken, $this->mTokenSalt );
 408                         } else {
 409                                 $submit = true;
 410                         }
 411                 }
 412
 413                 if ( $submit ) {
 414                         $this->mWasSubmitted = true;
 415                         $result = $this->trySubmit();
 416                 }
 417
 418                 return $result;
 419         }
 420
 421         /**
 422          * The here's-one-I-made-earlier option: do the submission if
 423          * posted, or display the form with or without funky validation
 424          * errors
 425          * @return bool|Status Whether submission was successful.
 426          */
 427         function show() {
 428                 $this->prepareForm();
 429
 430                 $result = $this->tryAuthorizedSubmit();
 431                 if ( $result === true || ( $result instanceof Status && $result->isGood() ) ) {
 432                         return $result;
 433                 }
 434
 435                 $this->displayForm( $result );
 436
 437                 return false;
 438         }
 439
 440         /**
 441          * Validate all the fields, and call the submission callback
 442          * function if everything is kosher.
 443          * @throws MWException
 444          * @return bool|string|array|Status
 445          *     - Bool true or a good Status object indicates success,
 446          *     - Bool false indicates no submission was attempted,
 447          *     - Anything else indicates failure. The value may be a fatal Status
 448          *       object, an HTML string, or an array of arrays (message keys and
 449          *       params) or strings (message keys)
 450          */
 451         function trySubmit() {
 452                 $this->mWasSubmitted = true;
 453
 454                 # Check for cancelled submission
 455                 foreach ( $this->mFlatFields as $fieldname => $field ) {
 456                         if ( !empty( $field->mParams['nodata'] ) ) {
 457                                 continue;
 458                         }
 459                         if ( $field->cancelSubmit( $this->mFieldData[$fieldname], $this->mFieldData ) ) {
 460                                 $this->mWasSubmitted = false;
 461                                 return false;
 462                         }
 463                 }
 464
 465                 # Check for validation
 466                 foreach ( $this->mFlatFields as $fieldname => $field ) {
 467                         if ( !empty( $field->mParams['nodata'] ) ) {
 468                                 continue;
 469                         }
 470                         if ( $field->validate(
 471                                         $this->mFieldData[$fieldname],
 472                                         $this->mFieldData )
 473                                 !== true
 474                         ) {
 475                                 return isset( $this->mValidationErrorMessage )
 476                                         ? $this->mValidationErrorMessage
 477                                         : array( 'htmlform-invalid-input' );
 478                         }
 479                 }
 480
 481                 $callback = $this->mSubmitCallback;
 482                 if ( !is_callable( $callback ) ) {
 483                         throw new MWException( 'HTMLForm: no submit callback provided. Use ' .
 484                                 'setSubmitCallback() to set one.' );
 485                 }
 486
 487                 $data = $this->filterDataForSubmit( $this->mFieldData );
 488
 489                 $res = call_user_func( $callback, $data, $this );
 490                 if ( $res === false ) {
 491                         $this->mWasSubmitted = false;
 492                 }
 493
 494                 return $res;
 495         }
 496
 497         /**
 498          * Test whether the form was considered to have been submitted or not, i.e.
 499          * whether the last call to tryAuthorizedSubmit or trySubmit returned
 500          * non-false.
 501          *
 502          * This will return false until HTMLForm::tryAuthorizedSubmit or
 503          * HTMLForm::trySubmit is called.
 504          *
 505          * @since 1.23
 506          * @return bool
 507          */
 508         function wasSubmitted() {
 509                 return $this->mWasSubmitted;
 510         }
 511
 512         /**
 513          * Set a callback to a function to do something with the form
 514          * once it's been successfully validated.
 515          *
 516          * @param callable $cb The function will be passed the output from
 517          *   HTMLForm::filterDataForSubmit and this HTMLForm object, and must
 518          *   return as documented for HTMLForm::trySubmit
 519          *
 520          * @return HTMLForm $this for chaining calls (since 1.20)
 521          */
 522         function setSubmitCallback( $cb ) {
 523                 $this->mSubmitCallback = $cb;
 524
 525                 return $this;
 526         }
 527
 528         /**
 529          * Set a message to display on a validation error.
 530          *
 531          * @param string|array $msg String or Array of valid inputs to wfMessage()
 532          *     (so each entry can be either a String or Array)
 533          *
 534          * @return HTMLForm $this for chaining calls (since 1.20)
 535          */
 536         function setValidationErrorMessage( $msg ) {
 537                 $this->mValidationErrorMessage = $msg;
 538
 539                 return $this;
 540         }
 541
 542         /**
 543          * Set the introductory message, overwriting any existing message.
 544          *
 545          * @param string $msg Complete text of message to display
 546          *
 547          * @return HTMLForm $this for chaining calls (since 1.20)
 548          */
 549         function setIntro( $msg ) {
 550                 $this->setPreText( $msg );
 551
 552                 return $this;
 553         }
 554
 555         /**
 556          * Set the introductory message, overwriting any existing message.
 557          * @since 1.19
 558          *
 559          * @param string $msg Complete text of message to display
 560          *
 561          * @return HTMLForm $this for chaining calls (since 1.20)
 562          */
 563         function setPreText( $msg ) {
 564                 $this->mPre = $msg;
 565
 566                 return $this;
 567         }
 568
 569         /**
 570          * Add introductory text.
 571          *
 572          * @param string $msg Complete text of message to display
 573          *
 574          * @return HTMLForm $this for chaining calls (since 1.20)
 575          */
 576         function addPreText( $msg ) {
 577                 $this->mPre .= $msg;
 578
 579                 return $this;
 580         }
 581
 582         /**
 583          * Add header text, inside the form.
 584          *
 585          * @param string $msg Complete text of message to display
 586          * @param string|null $section The section to add the header to
 587          *
 588          * @return HTMLForm $this for chaining calls (since 1.20)
 589          */
 590         function addHeaderText( $msg, $section = null ) {
 591                 if ( is_null( $section ) ) {
 592                         $this->mHeader .= $msg;
 593                 } else {
 594                         if ( !isset( $this->mSectionHeaders[$section] ) ) {
 595                                 $this->mSectionHeaders[$section] = '';
 596                         }
 597                         $this->mSectionHeaders[$section] .= $msg;
 598                 }
 599
 600                 return $this;
 601         }
 602
 603         /**
 604          * Set header text, inside the form.
 605          * @since 1.19
 606          *
 607          * @param string $msg Complete text of message to display
 608          * @param string|null $section The section to add the header to
 609          *
 610          * @return HTMLForm $this for chaining calls (since 1.20)
 611          */
 612         function setHeaderText( $msg, $section = null ) {
 613                 if ( is_null( $section ) ) {
 614                         $this->mHeader = $msg;
 615                 } else {
 616                         $this->mSectionHeaders[$section] = $msg;
 617                 }
 618
 619                 return $this;
 620         }
 621
 622         /**
 623          * Add footer text, inside the form.
 624          *
 625          * @param string $msg Complete text of message to display
 626          * @param string|null $section The section to add the footer text to
 627          *
 628          * @return HTMLForm $this for chaining calls (since 1.20)
 629          */
 630         function addFooterText( $msg, $section = null ) {
 631                 if ( is_null( $section ) ) {
 632                         $this->mFooter .= $msg;
 633                 } else {
 634                         if ( !isset( $this->mSectionFooters[$section] ) ) {
 635                                 $this->mSectionFooters[$section] = '';
 636                         }
 637                         $this->mSectionFooters[$section] .= $msg;
 638                 }
 639
 640                 return $this;
 641         }
 642
 643         /**
 644          * Set footer text, inside the form.
 645          * @since 1.19
 646          *
 647          * @param string $msg Complete text of message to display
 648          * @param string|null $section The section to add the footer text to
 649          *
 650          * @return HTMLForm $this for chaining calls (since 1.20)
 651          */
 652         function setFooterText( $msg, $section = null ) {
 653                 if ( is_null( $section ) ) {
 654                         $this->mFooter = $msg;
 655                 } else {
 656                         $this->mSectionFooters[$section] = $msg;
 657                 }
 658
 659                 return $this;
 660         }
 661
 662         /**
 663          * Add text to the end of the display.
 664          *
 665          * @param string $msg Complete text of message to display
 666          *
 667          * @return HTMLForm $this for chaining calls (since 1.20)
 668          */
 669         function addPostText( $msg ) {
 670                 $this->mPost .= $msg;
 671
 672                 return $this;
 673         }
 674
 675         /**
 676          * Set text at the end of the display.
 677          *
 678          * @param string $msg Complete text of message to display
 679          *
 680          * @return HTMLForm $this for chaining calls (since 1.20)
 681          */
 682         function setPostText( $msg ) {
 683                 $this->mPost = $msg;
 684
 685                 return $this;
 686         }
 687
 688         /**
 689          * Add a hidden field to the output
 690          *
 691          * @param string $name Field name.  This will be used exactly as entered
 692          * @param string $value Field value
 693          * @param array $attribs
 694          *
 695          * @return HTMLForm $this for chaining calls (since 1.20)
 696          */
 697         public function addHiddenField( $name, $value, $attribs = array() ) {
 698                 $attribs += array( 'name' => $name );
 699                 $this->mHiddenFields[] = array( $value, $attribs );
 700
 701                 return $this;
 702         }
 703
 704         /**
 705          * Add an array of hidden fields to the output
 706          *
 707          * @since 1.22
 708          *
 709          * @param array $fields Associative array of fields to add;
 710          *        mapping names to their values
 711          *
 712          * @return HTMLForm $this for chaining calls
 713          */
 714         public function addHiddenFields( array $fields ) {
 715                 foreach ( $fields as $name => $value ) {
 716                         $this->mHiddenFields[] = array( $value, array( 'name' => $name ) );
 717                 }
 718
 719                 return $this;
 720         }
 721
 722         /**
 723          * Add a button to the form
 724          *
 725          * @param string $name Field name.
 726          * @param string $value Field value
 727          * @param string $id DOM id for the button (default: null)
 728          * @param array $attribs
 729          *
 730          * @return HTMLForm $this for chaining calls (since 1.20)
 731          */
 732         public function addButton( $name, $value, $id = null, $attribs = null ) {
 733                 $this->mButtons[] = compact( 'name', 'value', 'id', 'attribs' );
 734
 735                 return $this;
 736         }
 737
 738         /**
 739          * Set the salt for the edit token.
 740          *
 741          * Only useful when the method is "post".
 742          *
 743          * @since 1.24
 744          * @param string|array $salt Salt to use
 745          * @return HTMLForm $this For chaining calls
 746          */
 747         public function setTokenSalt( $salt ) {
 748                 $this->mTokenSalt = $salt;
 749
 750                 return $this;
 751         }
 752
 753         /**
 754          * Display the form (sending to the context's OutputPage object), with an
 755          * appropriate error message or stack of messages, and any validation errors, etc.
 756          *
 757          * @attention You should call prepareForm() before calling this function.
 758          * Moreover, when doing method chaining this should be the very last method
 759          * call just after prepareForm().
 760          *
 761          * @param bool|string|array|Status $submitResult Output from HTMLForm::trySubmit()
 762          *
 763          * @return void Nothing, should be last call
 764          */
 765         function displayForm( $submitResult ) {
 766                 $this->getOutput()->addHTML( $this->getHTML( $submitResult ) );
 767         }
 768
 769         /**
 770          * Returns the raw HTML generated by the form
 771          *
 772          * @param bool|string|array|Status $submitResult Output from HTMLForm::trySubmit()
 773          *
 774          * @return string
 775          */
 776         function getHTML( $submitResult ) {
 777                 # For good measure (it is the default)
 778                 $this->getOutput()->preventClickjacking();
 779                 $this->getOutput()->addModules( 'mediawiki.htmlform' );
 780                 if ( $this->isVForm() ) {
 781                         $this->getOutput()->addModuleStyles( array(
 782                                 'mediawiki.ui',
 783                                 'mediawiki.ui.button',
 784                         ) );
 785                         // @todo Should vertical form set setWrapperLegend( false )
 786                         // to hide ugly fieldsets?
 787                 }
 788
 789                 $html = ''
 790                         . $this->getErrors( $submitResult )
 791                         . $this->mHeader
 792                         . $this->getBody()
 793                         . $this->getHiddenFields()
 794                         . $this->getButtons()
 795                         . $this->mFooter;
 796
 797                 $html = $this->wrapForm( $html );
 798
 799                 return '' . $this->mPre . $html . $this->mPost;
 800         }
 801
 802         /**
 803          * Wrap the form innards in an actual "<form>" element
 804          *
 805          * @param string $html HTML contents to wrap.
 806          *
 807          * @return string Wrapped HTML.
 808          */
 809         function wrapForm( $html ) {
 810
 811                 # Include a <fieldset> wrapper for style, if requested.
 812                 if ( $this->mWrapperLegend !== false ) {
 813                         $html = Xml::fieldset( $this->mWrapperLegend, $html );
 814                 }
 815                 # Use multipart/form-data
 816                 $encType = $this->mUseMultipart
 817                         ? 'multipart/form-data'
 818                         : 'application/x-www-form-urlencoded';
 819                 # Attributes
 820                 $attribs = array(
 821                         'action' => $this->getAction(),
 822                         'method' => $this->getMethod(),
 823                         'class' => array( 'visualClear' ),
 824                         'enctype' => $encType,
 825                 );
 826                 if ( !empty( $this->mId ) ) {
 827                         $attribs['id'] = $this->mId;
 828                 }
 829
 830                 if ( $this->isVForm() ) {
 831                         array_push( $attribs['class'], 'mw-ui-vform', 'mw-ui-container' );
 832                 }
 833
 834                 return Html::rawElement( 'form', $attribs, $html );
 835         }
 836
 837         /**
 838          * Get the hidden fields that should go inside the form.
 839          * @return string HTML.
 840          */
 841         function getHiddenFields() {
 842                 global $wgArticlePath;
 843
 844                 $html = '';
 845                 if ( $this->getMethod() == 'post' ) {
 846                         $html .= Html::hidden(
 847                                 'wpEditToken',
 848                                 $this->getUser()->getEditToken( $this->mTokenSalt ),
 849                                 array( 'id' => 'wpEditToken' )
 850                         ) . "\n";
 851                         $html .= Html::hidden( 'title', $this->getTitle()->getPrefixedText() ) . "\n";
 852                 }
 853
 854                 if ( strpos( $wgArticlePath, '?' ) !== false && $this->getMethod() == 'get' ) {
 855                         $html .= Html::hidden( 'title', $this->getTitle()->getPrefixedText() ) . "\n";
 856                 }
 857
 858                 foreach ( $this->mHiddenFields as $data ) {
 859                         list( $value, $attribs ) = $data;
 860                         $html .= Html::hidden( $attribs['name'], $value, $attribs ) . "\n";
 861                 }
 862
 863                 return $html;
 864         }
 865
 866         /**
 867          * Get the submit and (potentially) reset buttons.
 868          * @return string HTML.
 869          */
 870         function getButtons() {
 871                 $buttons = '';
 872
 873                 if ( $this->mShowSubmit ) {
 874                         $attribs = array();
 875
 876                         if ( isset( $this->mSubmitID ) ) {
 877                                 $attribs['id'] = $this->mSubmitID;
 878                         }
 879
 880                         if ( isset( $this->mSubmitName ) ) {
 881                                 $attribs['name'] = $this->mSubmitName;
 882                         }
 883
 884                         if ( isset( $this->mSubmitTooltip ) ) {
 885                                 $attribs += Linker::tooltipAndAccesskeyAttribs( $this->mSubmitTooltip );
 886                         }
 887
 888                         $attribs['class'] = array( 'mw-htmlform-submit' );
 889
 890                         if ( $this->isVForm() ) {
 891                                 // mw-ui-block is necessary because the buttons aren't necessarily in an
 892                                 // immediate child div of the vform.
 893                                 // @todo Let client specify if the primary submit button is progressive or destructive
 894                                 array_push(
 895                                         $attribs['class'],
 896                                         'mw-ui-button',
 897                                         'mw-ui-big',
 898                                         'mw-ui-constructive',
 899                                         'mw-ui-block'
 900                                 );
 901                         }
 902
 903                         $buttons .= Xml::submitButton( $this->getSubmitText(), $attribs ) . "\n";
 904                 }
 905
 906                 if ( $this->mShowReset ) {
 907                         $buttons .= Html::element(
 908                                 'input',
 909                                 array(
 910                                         'type' => 'reset',
 911                                         'value' => $this->msg( 'htmlform-reset' )->text()
 912                                 )
 913                         ) . "\n";
 914                 }
 915
 916                 foreach ( $this->mButtons as $button ) {
 917                         $attrs = array(
 918                                 'type' => 'submit',
 919                                 'name' => $button['name'],
 920                                 'value' => $button['value']
 921                         );
 922
 923                         if ( $button['attribs'] ) {
 924                                 $attrs += $button['attribs'];
 925                         }
 926
 927                         if ( isset( $button['id'] ) ) {
 928                                 $attrs['id'] = $button['id'];
 929                         }
 930
 931                         $buttons .= Html::element( 'input', $attrs ) . "\n";
 932                 }
 933
 934                 $html = Html::rawElement( 'span',
 935                         array( 'class' => 'mw-htmlform-submit-buttons' ), "\n$buttons" ) . "\n";
 936
 937                 // Buttons are top-level form elements in table and div layouts,
 938                 // but vform wants all elements inside divs to get spaced-out block
 939                 // styling.
 940                 if ( $this->mShowSubmit && $this->isVForm() ) {
 941                         $html = Html::rawElement( 'div', null, "\n$html" ) . "\n";
 942                 }
 943
 944                 return $html;
 945         }
 946
 947         /**
 948          * Get the whole body of the form.
 949          * @return string
 950          */
 951         function getBody() {
 952                 return $this->displaySection( $this->mFieldTree, $this->mTableId );
 953         }
 954
 955         /**
 956          * Format and display an error message stack.
 957          *
 958          * @param string|array|Status $errors
 959          *
 960          * @return string
 961          */
 962         function getErrors( $errors ) {
 963                 if ( $errors instanceof Status ) {
 964                         if ( $errors->isOK() ) {
 965                                 $errorstr = '';
 966                         } else {
 967                                 $errorstr = $this->getOutput()->parse( $errors->getWikiText() );
 968                         }
 969                 } elseif ( is_array( $errors ) ) {
 970                         $errorstr = $this->formatErrors( $errors );
 971                 } else {
 972                         $errorstr = $errors;
 973                 }
 974
 975                 return $errorstr
 976                         ? Html::rawElement( 'div', array( 'class' => 'error' ), $errorstr )
 977                         : '';
 978         }
 979
 980         /**
 981          * Format a stack of error messages into a single HTML string
 982          *
 983          * @param array $errors Array of message keys/values
 984          *
 985          * @return string HTML, a "<ul>" list of errors
 986          */
 987         public static function formatErrors( $errors ) {
 988                 $errorstr = '';
 989
 990                 foreach ( $errors as $error ) {
 991                         if ( is_array( $error ) ) {
 992                                 $msg = array_shift( $error );
 993                         } else {
 994                                 $msg = $error;
 995                                 $error = array();
 996                         }
 997
 998                         $errorstr .= Html::rawElement(
 999                                 'li',
1000                                 array(),
1001                                 wfMessage( $msg, $error )->parse()
1002                         );
1003                 }
1004
1005                 $errorstr = Html::rawElement( 'ul', array(), $errorstr );
1006
1007                 return $errorstr;
1008         }
1009
1010         /**
1011          * Set the text for the submit button
1012          *
1013          * @param string $t Plaintext
1014          *
1015          * @return HTMLForm $this for chaining calls (since 1.20)
1016          */
1017         function setSubmitText( $t ) {
1018                 $this->mSubmitText = $t;
1019
1020                 return $this;
1021         }
1022
1023         /**
1024          * Set the text for the submit button to a message
1025          * @since 1.19
1026          *
1027          * @param string $msg Message key
1028          *
1029          * @return HTMLForm $this for chaining calls (since 1.20)
1030          */
1031         public function setSubmitTextMsg( $msg ) {
1032                 $this->setSubmitText( $this->msg( $msg )->text() );
1033
1034                 return $this;
1035         }
1036
1037         /**
1038          * Get the text for the submit button, either customised or a default.
1039          * @return string
1040          */
1041         function getSubmitText() {
1042                 return $this->mSubmitText
1043                         ? $this->mSubmitText
1044                         : $this->msg( 'htmlform-submit' )->text();
1045         }
1046
1047         /**
1048          * @param string $name Submit button name
1049          *
1050          * @return HTMLForm $this for chaining calls (since 1.20)
1051          */
1052         public function setSubmitName( $name ) {
1053                 $this->mSubmitName = $name;
1054
1055                 return $this;
1056         }
1057
1058         /**
1059          * @param string $name Tooltip for the submit button
1060          *
1061          * @return HTMLForm $this for chaining calls (since 1.20)
1062          */
1063         public function setSubmitTooltip( $name ) {
1064                 $this->mSubmitTooltip = $name;
1065
1066                 return $this;
1067         }
1068
1069         /**
1070          * Set the id for the submit button.
1071          *
1072          * @param string $t
1073          *
1074          * @todo FIXME: Integrity of $t is *not* validated
1075          * @return HTMLForm $this for chaining calls (since 1.20)
1076          */
1077         function setSubmitID( $t ) {
1078                 $this->mSubmitID = $t;
1079
1080                 return $this;
1081         }
1082
1083         /**
1084          * Stop a default submit button being shown for this form. This implies that an
1085          * alternate submit method must be provided manually.
1086          *
1087          * @since 1.22
1088          *
1089          * @param bool $suppressSubmit Set to false to re-enable the button again
1090          *
1091          * @return HTMLForm $this for chaining calls
1092          */
1093         function suppressDefaultSubmit( $suppressSubmit = true ) {
1094                 $this->mShowSubmit = !$suppressSubmit;
1095
1096                 return $this;
1097         }
1098
1099         /**
1100          * Set the id of the \<table\> or outermost \<div\> element.
1101          *
1102          * @since 1.22
1103          *
1104          * @param string $id New value of the id attribute, or "" to remove
1105          *
1106          * @return HTMLForm $this for chaining calls
1107          */
1108         public function setTableId( $id ) {
1109                 $this->mTableId = $id;
1110
1111                 return $this;
1112         }
1113
1114         /**
1115          * @param string $id DOM id for the form
1116          *
1117          * @return HTMLForm $this for chaining calls (since 1.20)
1118          */
1119         public function setId( $id ) {
1120                 $this->mId = $id;
1121
1122                 return $this;
1123         }
1124
1125         /**
1126          * Prompt the whole form to be wrapped in a "<fieldset>", with
1127          * this text as its "<legend>" element.
1128          *
1129          * @param string|bool $legend HTML to go inside the "<legend>" element, or
1130          * false for no <legend>
1131          *     Will be escaped
1132          *
1133          * @return HTMLForm $this for chaining calls (since 1.20)
1134          */
1135         public function setWrapperLegend( $legend ) {
1136                 $this->mWrapperLegend = $legend;
1137
1138                 return $this;
1139         }
1140
1141         /**
1142          * Prompt the whole form to be wrapped in a "<fieldset>", with
1143          * this message as its "<legend>" element.
1144          * @since 1.19
1145          *
1146          * @param string $msg Message key
1147          *
1148          * @return HTMLForm $this for chaining calls (since 1.20)
1149          */
1150         public function setWrapperLegendMsg( $msg ) {
1151                 $this->setWrapperLegend( $this->msg( $msg )->text() );
1152
1153                 return $this;
1154         }
1155
1156         /**
1157          * Set the prefix for various default messages
1158          * @todo Currently only used for the "<fieldset>" legend on forms
1159          * with multiple sections; should be used elsewhere?
1160          *
1161          * @param string $p
1162          *
1163          * @return HTMLForm $this for chaining calls (since 1.20)
1164          */
1165         function setMessagePrefix( $p ) {
1166                 $this->mMessagePrefix = $p;
1167
1168                 return $this;
1169         }
1170
1171         /**
1172          * Set the title for form submission
1173          *
1174          * @param Title $t Title of page the form is on/should be posted to
1175          *
1176          * @return HTMLForm $this for chaining calls (since 1.20)
1177          */
1178         function setTitle( $t ) {
1179                 $this->mTitle = $t;
1180
1181                 return $this;
1182         }
1183
1184         /**
1185          * Get the title
1186          * @return Title
1187          */
1188         function getTitle() {
1189                 return $this->mTitle === false
1190                         ? $this->getContext()->getTitle()
1191                         : $this->mTitle;
1192         }
1193
1194         /**
1195          * Set the method used to submit the form
1196          *
1197          * @param string $method
1198          *
1199          * @return HTMLForm $this for chaining calls (since 1.20)
1200          */
1201         public function setMethod( $method = 'post' ) {
1202                 $this->mMethod = $method;
1203
1204                 return $this;
1205         }
1206
1207         public function getMethod() {
1208                 return $this->mMethod;
1209         }
1210
1211         /**
1212          * @todo Document
1213          *
1214          * @param array[]|HTMLFormField[] $fields Array of fields (either arrays or
1215          *   objects).
1216          * @param string $sectionName ID attribute of the "<table>" tag for this
1217          *   section, ignored if empty.
1218          * @param string $fieldsetIDPrefix ID prefix for the "<fieldset>" tag of
1219          *   each subsection, ignored if empty.
1220          * @param bool &$hasUserVisibleFields Whether the section had user-visible fields.
1221          *
1222          * @return string
1223          */
1224         public function displaySection( $fields,
1225                 $sectionName = '',
1226                 $fieldsetIDPrefix = '',
1227                 &$hasUserVisibleFields = false ) {
1228                 $displayFormat = $this->getDisplayFormat();
1229
1230                 $html = '';
1231                 $subsectionHtml = '';
1232                 $hasLabel = false;
1233
1234                 switch ( $displayFormat ) {
1235                         case 'table':
1236                                 $getFieldHtmlMethod = 'getTableRow';
1237                                 break;
1238                         case 'vform':
1239                                 // Close enough to a div.
1240                                 $getFieldHtmlMethod = 'getDiv';
1241                                 break;
1242                         default:
1243                                 $getFieldHtmlMethod = 'get' . ucfirst( $displayFormat );
1244                 }
1245
1246                 foreach ( $fields as $key => $value ) {
1247                         if ( $value instanceof HTMLFormField ) {
1248                                 $v = empty( $value->mParams['nodata'] )
1249                                         ? $this->mFieldData[$key]
1250                                         : $value->getDefault();
1251                                 $html .= $value->$getFieldHtmlMethod( $v );
1252
1253                                 $labelValue = trim( $value->getLabel() );
1254                                 if ( $labelValue != '&#160;' && $labelValue !== '' ) {
1255                                         $hasLabel = true;
1256                                 }
1257
1258                                 if ( get_class( $value ) !== 'HTMLHiddenField' &&
1259                                         get_class( $value ) !== 'HTMLApiField'
1260                                 ) {
1261                                         $hasUserVisibleFields = true;
1262                                 }
1263                         } elseif ( is_array( $value ) ) {
1264                                 $subsectionHasVisibleFields = false;
1265                                 $section =
1266                                         $this->displaySection( $value,
1267                                                 "mw-htmlform-$key",
1268                                                 "$fieldsetIDPrefix$key-",
1269                                                 $subsectionHasVisibleFields );
1270                                 $legend = null;
1271
1272                                 if ( $subsectionHasVisibleFields === true ) {
1273                                         // Display the section with various niceties.
1274                                         $hasUserVisibleFields = true;
1275
1276                                         $legend = $this->getLegend( $key );
1277
1278                                         if ( isset( $this->mSectionHeaders[$key] ) ) {
1279                                                 $section = $this->mSectionHeaders[$key] . $section;
1280                                         }
1281                                         if ( isset( $this->mSectionFooters[$key] ) ) {
1282                                                 $section .= $this->mSectionFooters[$key];
1283                                         }
1284
1285                                         $attributes = array();
1286                                         if ( $fieldsetIDPrefix ) {
1287                                                 $attributes['id'] = Sanitizer::escapeId( "$fieldsetIDPrefix$key" );
1288                                         }
1289                                         $subsectionHtml .= Xml::fieldset( $legend, $section, $attributes ) . "\n";
1290                                 } else {
1291                                         // Just return the inputs, nothing fancy.
1292                                         $subsectionHtml .= $section;
1293                                 }
1294                         }
1295                 }
1296
1297                 if ( $displayFormat !== 'raw' ) {
1298                         $classes = array();
1299
1300                         if ( !$hasLabel ) { // Avoid strange spacing when no labels exist
1301                                 $classes[] = 'mw-htmlform-nolabel';
1302                         }
1303
1304                         $attribs = array(
1305                                 'class' => implode( ' ', $classes ),
1306                         );
1307
1308                         if ( $sectionName ) {
1309                                 $attribs['id'] = Sanitizer::escapeId( $sectionName );
1310                         }
1311
1312                         if ( $displayFormat === 'table' ) {
1313                                 $html = Html::rawElement( 'table',
1314                                                 $attribs,
1315                                                 Html::rawElement( 'tbody', array(), "\n$html\n" ) ) . "\n";
1316                         } elseif ( $displayFormat === 'div' || $displayFormat === 'vform' ) {
1317                                 $html = Html::rawElement( 'div', $attribs, "\n$html\n" );
1318                         }
1319                 }
1320
1321                 if ( $this->mSubSectionBeforeFields ) {
1322                         return $subsectionHtml . "\n" . $html;
1323                 } else {
1324                         return $html . "\n" . $subsectionHtml;
1325                 }
1326         }
1327
1328         /**
1329          * Construct the form fields from the Descriptor array
1330          */
1331         function loadData() {
1332                 $fieldData = array();
1333
1334                 foreach ( $this->mFlatFields as $fieldname => $field ) {
1335                         if ( !empty( $field->mParams['nodata'] ) ) {
1336                                 continue;
1337                         } elseif ( !empty( $field->mParams['disabled'] ) ) {
1338                                 $fieldData[$fieldname] = $field->getDefault();
1339                         } else {
1340                                 $fieldData[$fieldname] = $field->loadDataFromRequest( $this->getRequest() );
1341                         }
1342                 }
1343
1344                 # Filter data.
1345                 foreach ( $fieldData as $name => &$value ) {
1346                         $field = $this->mFlatFields[$name];
1347                         $value = $field->filter( $value, $this->mFlatFields );
1348                 }
1349
1350                 $this->mFieldData = $fieldData;
1351         }
1352
1353         /**
1354          * Stop a reset button being shown for this form
1355          *
1356          * @param bool $suppressReset Set to false to re-enable the button again
1357          *
1358          * @return HTMLForm $this for chaining calls (since 1.20)
1359          */
1360         function suppressReset( $suppressReset = true ) {
1361                 $this->mShowReset = !$suppressReset;
1362
1363                 return $this;
1364         }
1365
1366         /**
1367          * Overload this if you want to apply special filtration routines
1368          * to the form as a whole, after it's submitted but before it's
1369          * processed.
1370          *
1371          * @param array $data
1372          *
1373          * @return array
1374          */
1375         function filterDataForSubmit( $data ) {
1376                 return $data;
1377         }
1378
1379         /**
1380          * Get a string to go in the "<legend>" of a section fieldset.
1381          * Override this if you want something more complicated.
1382          *
1383          * @param string $key
1384          *
1385          * @return string
1386          */
1387         public function getLegend( $key ) {
1388                 return $this->msg( "{$this->mMessagePrefix}-$key" )->text();
1389         }
1390
1391         /**
1392          * Set the value for the action attribute of the form.
1393          * When set to false (which is the default state), the set title is used.
1394          *
1395          * @since 1.19
1396          *
1397          * @param string|bool $action
1398          *
1399          * @return HTMLForm $this for chaining calls (since 1.20)
1400          */
1401         public function setAction( $action ) {
1402                 $this->mAction = $action;
1403
1404                 return $this;
1405         }
1406
1407         /**
1408          * Get the value for the action attribute of the form.
1409          *
1410          * @since 1.22
1411          *
1412          * @return string
1413          */
1414         public function getAction() {
1415                 global $wgScript, $wgArticlePath;
1416
1417                 // If an action is alredy provided, return it
1418                 if ( $this->mAction !== false ) {
1419                         return $this->mAction;
1420                 }
1421
1422                 // Check whether we are in GET mode and $wgArticlePath contains a "?"
1423                 // meaning that getLocalURL() would return something like "index.php?title=...".
1424                 // As browser remove the query string before submitting GET forms,
1425                 // it means that the title would be lost. In such case use $wgScript instead
1426                 // and put title in an hidden field (see getHiddenFields()).
1427                 if ( strpos( $wgArticlePath, '?' ) !== false && $this->getMethod() === 'get' ) {
1428                         return $wgScript;
1429                 }
1430
1431                 return $this->getTitle()->getLocalURL();
1432         }
1433 }