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