/
Form.php
1487 lines (1295 loc) · 43.3 KB
/
Form.php
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<?php
/**
* Base class for all forms.
* The form class is an extensible base for all forms on a SilverStripe application. It can be used
* either by extending it, and creating processor methods on the subclass, or by creating instances
* of form whose actions are handled by the parent controller.
*
* In either case, if you want to get a form to do anything, it must be inextricably tied to a
* controller. The constructor is passed a controller and a method on that controller. This method
* should return the form object, and it shouldn't require any arguments. Parameters, if necessary,
* can be passed using the URL or get variables. These restrictions are in place so that we can
* recreate the form object upon form submission, without the use of a session, which would be too
* resource-intensive.
*
* You will need to create at least one method for processing the submission (through {@link FormAction}).
* This method will be passed two parameters: the raw request data, and the form object.
* Usually you want to save data into a {@link DataObject} by using {@link saveInto()}.
* If you want to process the submitted data in any way, please use {@link getData()} rather than
* the raw request data.
*
* <h2>Validation</h2>
* Each form needs some form of {@link Validator} to trigger the {@link FormField->validate()} methods for each field.
* You can't disable validator for security reasons, because crucial behaviour like extension checks for file uploads
* depend on it.
* The default validator is an instance of {@link RequiredFields}.
* If you want to enforce serverside-validation to be ignored for a specific {@link FormField},
* you need to subclass it.
*
* <h2>URL Handling</h2>
* The form class extends {@link RequestHandler}, which means it can
* be accessed directly through a URL. This can be handy for refreshing
* a form by ajax, or even just displaying a single form field.
* You can find out the base URL for your form by looking at the
* <form action="..."> value. For example, the edit form in the CMS would be located at
* "admin/EditForm". This URL will render the form without its surrounding
* template when called through GET instead of POST.
*
* By appending to this URL, you can render invidual form elements
* through the {@link FormField->FieldHolder()} method.
* For example, the "URLSegment" field in a standard CMS form would be
* accessible through "admin/EditForm/field/URLSegment/FieldHolder".
*
* @package forms
* @subpackage core
*/
class Form extends RequestHandler {
const ENC_TYPE_URLENCODED = 'application/x-www-form-urlencoded';
const ENC_TYPE_MULTIPART = 'multipart/form-data';
/**
* @var boolean $includeFormTag Accessed by Form.ss; modified by {@link formHtmlContent()}.
* A performance enhancement over the generate-the-form-tag-and-then-remove-it code that was there previously
*/
public $IncludeFormTag = true;
protected $fields;
protected $actions;
protected $controller;
protected $name;
protected $validator;
protected $formMethod = "post";
protected static $current_action;
/**
* @var Dataobject $record Populated by {@link loadDataFrom()}.
*/
protected $record;
/**
* Keeps track of whether this form has a default action or not.
* Set to false by $this->disableDefaultAction();
*/
protected $hasDefaultAction = true;
/**
* Target attribute of form-tag.
* Useful to open a new window upon
* form submission.
*
* @var string
*/
protected $target;
/**
* Legend value, to be inserted into the
* <legend> element before the <fieldset>
* in Form.ss template.
*
* @var string
*/
protected $legend;
/**
* The SS template to render this form HTML into.
* Default is "Form", but this can be changed to
* another template for customisation.
*
* @see Form->setTemplate()
* @var string
*/
protected $template;
protected $buttonClickedFunc;
protected $message;
protected $messageType;
/**
* Should we redirect the user back down to the
* the form on validation errors rather then just the page
*
* @var bool
*/
protected $redirectToFormOnValidationError = false;
protected $security = true;
/**
* @var SecurityToken
*/
protected $securityToken = null;
/**
* @var array $extraClasses List of additional CSS classes for the form tag.
*/
protected $extraClasses = array();
/**
* @var string
*/
protected $encType;
/**
* @var array Any custom form attributes set through {@link setAttributes()}.
* Some attributes are calculated on the fly, so please use {@link getAttributes()} to access them.
*/
protected $attributes = array();
/**
* Create a new form, with the given fields an action buttons.
*
* @param Controller $controller The parent controller, necessary to create the appropriate form action tag.
* @param String $name The method on the controller that will return this form object.
* @param FieldList $fields All of the fields in the form - a {@link FieldList} of {@link FormField} objects.
* @param FieldList $actions All of the action buttons in the form - a {@link FieldLis} of
* {@link FormAction} objects
* @param Validator $validator Override the default validator instance (Default: {@link RequiredFields})
*/
public function __construct($controller, $name, FieldList $fields, FieldList $actions, $validator = null) {
parent::__construct();
if(!$fields instanceof FieldList) {
throw new InvalidArgumentException('$fields must be a valid FieldList instance');
}
if(!$actions instanceof FieldList) {
throw new InvalidArgumentException('$actions must be a valid FieldList instance');
}
if($validator && !$validator instanceof Validator) {
throw new InvalidArgumentException('$validator must be a Valdidator instance');
}
$fields->setForm($this);
$actions->setForm($this);
$this->fields = $fields;
$this->actions = $actions;
$this->controller = $controller;
$this->name = $name;
if(!$this->controller) user_error("$this->class form created without a controller", E_USER_ERROR);
// Form validation
$this->validator = ($validator) ? $validator : new RequiredFields();
$this->validator->setForm($this);
// Form error controls
$this->setupFormErrors();
// Check if CSRF protection is enabled, either on the parent controller or from the default setting. Note that
// method_exists() is used as some controllers (e.g. GroupTest) do not always extend from Object.
if(method_exists($controller, 'securityTokenEnabled') || (method_exists($controller, 'hasMethod')
&& $controller->hasMethod('securityTokenEnabled'))) {
$securityEnabled = $controller->securityTokenEnabled();
} else {
$securityEnabled = SecurityToken::is_enabled();
}
$this->securityToken = ($securityEnabled) ? new SecurityToken() : new NullSecurityToken();
}
static $url_handlers = array(
'field/$FieldName!' => 'handleField',
'POST ' => 'httpSubmission',
'GET ' => 'httpSubmission',
'HEAD ' => 'httpSubmission',
);
/**
* Set up current form errors in session to
* the current form if appropriate.
*/
public function setupFormErrors() {
$errorInfo = Session::get("FormInfo.{$this->FormName()}");
if(isset($errorInfo['errors']) && is_array($errorInfo['errors'])) {
foreach($errorInfo['errors'] as $error) {
$field = $this->fields->dataFieldByName($error['fieldName']);
if(!$field) {
$errorInfo['message'] = $error['message'];
$errorInfo['type'] = $error['messageType'];
} else {
$field->setError($error['message'], $error['messageType']);
}
}
// load data in from previous submission upon error
if(isset($errorInfo['data'])) $this->loadDataFrom($errorInfo['data']);
}
if(isset($errorInfo['message']) && isset($errorInfo['type'])) {
$this->setMessage($errorInfo['message'], $errorInfo['type']);
}
}
/**
* Handle a form submission. GET and POST requests behave identically.
* Populates the form with {@link loadDataFrom()}, calls {@link validate()},
* and only triggers the requested form action/method
* if the form is valid.
*/
public function httpSubmission($request) {
$vars = $request->requestVars();
if(isset($funcName)) {
Form::set_current_action($funcName);
}
// Populate the form
$this->loadDataFrom($vars, true);
// Protection against CSRF attacks
$token = $this->getSecurityToken();
if(!$token->checkRequest($request)) {
$this->httpError(400, _t("Form.CSRF_FAILED_MESSAGE",
"There seems to have been a technical problem. Please click the back button,"
. " refresh your browser, and try again."));
}
// Determine the action button clicked
$funcName = null;
foreach($vars as $paramName => $paramVal) {
if(substr($paramName,0,7) == 'action_') {
// Break off querystring arguments included in the action
if(strpos($paramName,'?') !== false) {
list($paramName, $paramVars) = explode('?', $paramName, 2);
$newRequestParams = array();
parse_str($paramVars, $newRequestParams);
$vars = array_merge((array)$vars, (array)$newRequestParams);
}
// Cleanup action_, _x and _y from image fields
$funcName = preg_replace(array('/^action_/','/_x$|_y$/'),'',$paramName);
break;
}
}
// If the action wasnt' set, choose the default on the form.
if(!isset($funcName) && $defaultAction = $this->defaultAction()){
$funcName = $defaultAction->actionName();
}
if(isset($funcName)) {
$this->setButtonClicked($funcName);
}
// Permission checks (first on controller, then falling back to form)
if(
// Ensure that the action is actually a button or method on the form,
// and not just a method on the controller.
$this->controller->hasMethod($funcName)
&& !$this->controller->checkAccessAction($funcName)
// If a button exists, allow it on the controller
&& !$this->actions->dataFieldByName('action_' . $funcName)
) {
return $this->httpError(
403,
sprintf('Action "%s" not allowed on controller (Class: %s)', $funcName, get_class($this->controller))
);
} elseif(
$this->hasMethod($funcName)
&& !$this->checkAccessAction($funcName)
// No checks for button existence or $allowed_actions is performed -
// all form methods are callable (e.g. the legacy "callfieldmethod()")
) {
return $this->httpError(
403,
sprintf('Action "%s" not allowed on form (Name: "%s")', $funcName, $this->name)
);
}
// TODO : Once we switch to a stricter policy regarding allowed_actions (meaning actions must be set
// explicitly in allowed_actions in order to run)
// Uncomment the following for checking security against running actions on form fields
/* else {
// Try to find a field that has the action, and allows it
$fieldsHaveMethod = false;
foreach ($this->Fields() as $field){
if ($field->hasMethod($funcName) && $field->checkAccessAction($funcName)) {
$fieldsHaveMethod = true;
}
}
if (!$fieldsHaveMethod) {
return $this->httpError(
403,
sprintf('Action "%s" not allowed on any fields of form (Name: "%s")', $funcName, $this->Name())
);
}
}*/
// Validate the form
if(!$this->validate()) {
if(Director::is_ajax()) {
// Special case for legacy Validator.js implementation (assumes eval'ed javascript collected through
// FormResponse)
$acceptType = $request->getHeader('Accept');
if(strpos($acceptType, 'application/json') !== FALSE) {
// Send validation errors back as JSON with a flag at the start
$response = new SS_HTTPResponse(Convert::array2json($this->validator->getErrors()));
$response->addHeader('Content-Type', 'application/json');
} else {
$this->setupFormErrors();
// Send the newly rendered form tag as HTML
$response = new SS_HTTPResponse($this->forTemplate());
$response->addHeader('Content-Type', 'text/html');
}
return $response;
} else {
if($this->getRedirectToFormOnValidationError()) {
if($pageURL = $request->getHeader('Referer')) {
if(Director::is_site_url($pageURL)) {
// Remove existing pragmas
$pageURL = preg_replace('/(#.*)/', '', $pageURL);
return $this->controller->redirect($pageURL . '#' . $this->FormName());
}
}
}
return $this->controller->redirectBack();
}
}
// First, try a handler method on the controller (has been checked for allowed_actions above already)
if($this->controller->hasMethod($funcName)) {
return $this->controller->$funcName($vars, $this, $request);
// Otherwise, try a handler method on the form object.
} elseif($this->hasMethod($funcName)) {
return $this->$funcName($vars, $this, $request);
} elseif($field = $this->checkFieldsForAction($this->Fields(), $funcName)) {
return $field->$funcName($vars, $this, $request);
}
return $this->httpError(404);
}
/**
* Fields can have action to, let's check if anyone of the responds to $funcname them
*
* @return FormField
*/
protected function checkFieldsForAction($fields, $funcName) {
foreach($fields as $field){
if(method_exists($field, 'FieldList')) {
if($field = $this->checkFieldsForAction($field->FieldList(), $funcName)) {
return $field;
}
} elseif ($field->hasMethod($funcName)) {
return $field;
}
}
}
/**
* Handle a field request.
* Uses {@link Form->dataFieldByName()} to find a matching field,
* and falls back to {@link FieldList->fieldByName()} to look
* for tabs instead. This means that if you have a tab and a
* formfield with the same name, this method gives priority
* to the formfield.
*
* @param SS_HTTPRequest $request
* @return FormField
*/
public function handleField($request) {
$field = $this->Fields()->dataFieldByName($request->param('FieldName'));
if($field) {
return $field;
} else {
// falling back to fieldByName, e.g. for getting tabs
return $this->Fields()->fieldByName($request->param('FieldName'));
}
}
/**
* Convert this form into a readonly form
*/
public function makeReadonly() {
$this->transform(new ReadonlyTransformation());
}
/**
* Set whether the user should be redirected back down to the
* form on the page upon validation errors in the form or if
* they just need to redirect back to the page
*
* @param bool Redirect to the form
*/
public function setRedirectToFormOnValidationError($bool) {
$this->redirectToFormOnValidationError = $bool;
return $this;
}
/**
* Get whether the user should be redirected back down to the
* form on the page upon validation errors
*
* @return bool
*/
public function getRedirectToFormOnValidationError() {
return $this->redirectToFormOnValidationError;
}
/**
* Add an error message to a field on this form. It will be saved into the session
* and used the next time this form is displayed.
*/
public function addErrorMessage($fieldName, $message, $messageType) {
Session::add_to_array("FormInfo.{$this->FormName()}.errors", array(
'fieldName' => $fieldName,
'message' => $message,
'messageType' => $messageType,
));
}
public function transform(FormTransformation $trans) {
$newFields = new FieldList();
foreach($this->fields as $field) {
$newFields->push($field->transform($trans));
}
$this->fields = $newFields;
$newActions = new FieldList();
foreach($this->actions as $action) {
$newActions->push($action->transform($trans));
}
$this->actions = $newActions;
// We have to remove validation, if the fields are not editable ;-)
if($this->validator)
$this->validator->removeValidation();
}
/**
* Get the {@link Validator} attached to this form.
* @return Validator
*/
public function getValidator() {
return $this->validator;
}
/**
* Set the {@link Validator} on this form.
*/
public function setValidator( Validator $validator ) {
if($validator) {
$this->validator = $validator;
$this->validator->setForm($this);
}
return $this;
}
/**
* Remove the {@link Validator} from this from.
*/
public function unsetValidator(){
$this->validator = null;
return $this;
}
/**
* Convert this form to another format.
*/
public function transformTo(FormTransformation $format) {
$newFields = new FieldList();
foreach($this->fields as $field) {
$newFields->push($field->transformTo($format));
}
$this->fields = $newFields;
// We have to remove validation, if the fields are not editable ;-)
if($this->validator)
$this->validator->removeValidation();
}
/**
* Generate extra special fields - namely the security token field (if required).
*
* @return FieldList
*/
public function getExtraFields() {
$extraFields = new FieldList();
$token = $this->getSecurityToken();
$tokenField = $token->updateFieldSet($this->fields);
if($tokenField) $tokenField->setForm($this);
$this->securityTokenAdded = true;
// add the "real" HTTP method if necessary (for PUT, DELETE and HEAD)
if($this->FormMethod() != $this->FormHttpMethod()) {
$methodField = new HiddenField('_method', '', $this->FormHttpMethod());
$methodField->setForm($this);
$extraFields->push($methodField);
}
return $extraFields;
}
/**
* Return the form's fields - used by the templates
*
* @return FieldList The form fields
*/
public function Fields() {
foreach($this->getExtraFields() as $field) {
if(!$this->fields->fieldByName($field->getName())) $this->fields->push($field);
}
return $this->fields;
}
/**
* Return all <input type="hidden"> fields
* in a form - including fields nested in {@link CompositeFields}.
* Useful when doing custom field layouts.
*
* @return FieldList
*/
public function HiddenFields() {
return $this->fields->HiddenFields();
}
/**
* Return all fields except for the hidden fields.
* Useful when making your own simplified form layouts.
*/
public function VisibleFields() {
return $this->fields->VisibleFields();
}
/**
* Setter for the form fields.
*
* @param FieldList $fields
*/
public function setFields($fields) {
$this->fields = $fields;
return $this;
}
/**
* Return the form's action buttons - used by the templates
*
* @return FieldList The action list
*/
public function Actions() {
return $this->actions;
}
/**
* Setter for the form actions.
*
* @param FieldList $actions
*/
public function setActions($actions) {
$this->actions = $actions;
return $this;
}
/**
* Unset all form actions
*/
public function unsetAllActions(){
$this->actions = new FieldList();
return $this;
}
/**
* @param String
* @param String
*/
public function setAttribute($name, $value) {
$this->attributes[$name] = $value;
return $this;
}
/**
* @return String
*/
public function getAttribute($name) {
return @$this->attributes[$name];
}
public function getAttributes() {
$attrs = array(
'id' => $this->FormName(),
'action' => $this->FormAction(),
'method' => $this->FormMethod(),
'enctype' => $this->getEncType(),
'target' => $this->target,
'class' => $this->extraClass(),
);
if($this->validator && $this->validator->getErrors()) {
if(!isset($attrs['class'])) $attrs['class'] = '';
$attrs['class'] .= ' validationerror';
}
$attrs = array_merge($attrs, $this->attributes);
return $attrs;
}
/**
* Return the attributes of the form tag - used by the templates.
*
* @param Array Custom attributes to process. Falls back to {@link getAttributes()}.
* If at least one argument is passed as a string, all arguments act as excludes by name.
* @return String HTML attributes, ready for insertion into an HTML tag
*/
public function getAttributesHTML($attrs = null) {
$exclude = (is_string($attrs)) ? func_get_args() : null;
if(!$attrs || is_string($attrs)) $attrs = $this->getAttributes();
// Figure out if we can cache this form
// - forms with validation shouldn't be cached, cos their error messages won't be shown
// - forms with security tokens shouldn't be cached because security tokens expire
$needsCacheDisabled = false;
if ($this->getSecurityToken()->isEnabled()) $needsCacheDisabled = true;
if ($this->FormMethod() != 'get') $needsCacheDisabled = true;
if (!($this->validator instanceof RequiredFields) || count($this->validator->getRequired())) {
$needsCacheDisabled = true;
}
// If we need to disable cache, do it
if ($needsCacheDisabled) HTTP::set_cache_age(0);
$attrs = $this->getAttributes();
// Remove empty
$attrs = array_filter((array)$attrs, create_function('$v', 'return ($v || $v === 0);'));
// Remove excluded
if($exclude) $attrs = array_diff_key($attrs, array_flip($exclude));
// Create markkup
$parts = array();
foreach($attrs as $name => $value) {
$parts[] = ($value === true) ? "{$name}=\"{$name}\"" : "{$name}=\"" . Convert::raw2att($value) . "\"";
}
return implode(' ', $parts);
}
public function FormAttributes() {
return $this->getAttributesHTML();
}
/**
* Set the target of this form to any value - useful for opening the form contents in a new window or refreshing
* another frame
*
* @param target The value of the target
*/
public function setTarget($target) {
$this->target = $target;
return $this;
}
/**
* Set the legend value to be inserted into
* the <legend> element in the Form.ss template.
*/
public function setLegend($legend) {
$this->legend = $legend;
return $this;
}
/**
* Set the SS template that this form should use
* to render with. The default is "Form".
*
* @param string $template The name of the template (without the .ss extension)
*/
public function setTemplate($template) {
$this->template = $template;
return $this;
}
/**
* Return the template to render this form with.
* If the template isn't set, then default to the
* form class name e.g "Form".
*
* @return string
*/
public function getTemplate() {
if($this->template) return $this->template;
else return $this->class;
}
/**
* Returns the encoding type for the form.
*
* By default this will be URL encoded, unless there is a file field present
* in which case multipart is used. You can also set the enc type using
* {@link setEncType}.
*/
public function getEncType() {
if ($this->encType) {
return $this->encType;
}
if ($fields = $this->fields->dataFields()) {
foreach ($fields as $field) {
if ($field instanceof FileField) return self::ENC_TYPE_MULTIPART;
}
}
return self::ENC_TYPE_URLENCODED;
}
/**
* Sets the form encoding type. The most common encoding types are defined
* in {@link ENC_TYPE_URLENCODED} and {@link ENC_TYPE_MULTIPART}.
*
* @param string $enctype
*/
public function setEncType($encType) {
$this->encType = $encType;
return $this;
}
/**
* Returns the real HTTP method for the form:
* GET, POST, PUT, DELETE or HEAD.
* As most browsers only support GET and POST in
* form submissions, all other HTTP methods are
* added as a hidden field "_method" that
* gets evaluated in {@link Director::direct()}.
* See {@link FormMethod()} to get a HTTP method
* for safe insertion into a <form> tag.
*
* @return string HTTP method
*/
public function FormHttpMethod() {
return $this->formMethod;
}
/**
* Returns the form method to be used in the <form> tag.
* See {@link FormHttpMethod()} to get the "real" method.
*
* @return string Form tag compatbile HTTP method: 'get' or 'post'
*/
public function FormMethod() {
if(in_array($this->formMethod,array('get','post'))) {
return $this->formMethod;
} else {
return 'post';
}
}
/**
* Set the form method: GET, POST, PUT, DELETE.
*
* @param $method string
*/
public function setFormMethod($method) {
$this->formMethod = strtolower($method);
return $this;
}
/**
* Return the form's action attribute.
* This is build by adding an executeForm get variable to the parent controller's Link() value
*
* @return string
*/
public function FormAction() {
if ($this->formActionPath) {
return $this->formActionPath;
} elseif($this->controller->hasMethod("FormObjectLink")) {
return $this->controller->FormObjectLink($this->name);
} else {
return Controller::join_links($this->controller->Link(), $this->name);
}
}
/** @ignore */
private $formActionPath = false;
/**
* Set the form action attribute to a custom URL.
*
* Note: For "normal" forms, you shouldn't need to use this method. It is recommended only for situations where
* you have two relatively distinct parts of the system trying to communicate via a form post.
*/
public function setFormAction($path) {
$this->formActionPath = $path;
return $this;
}
/**
* @ignore
*/
private $htmlID = null;
/**
* Returns the name of the form
*/
public function FormName() {
if($this->htmlID) return $this->htmlID;
else return $this->class . '_' . str_replace(array('.', '/'), '', $this->name);
}
/**
* Set the HTML ID attribute of the form
*/
public function setHTMLID($id) {
$this->htmlID = $id;
}
/**
* Returns this form's controller.
* This is used in the templates.
*/
public function Controller() {
return $this->getController();
}
/**
* Get the controller.
* @return Controller
*/
public function getController() {
return $this->controller;
}
/**
* Set the controller.
* @param Controller $controller
* @return Form
*/
public function setController($controller) {
$this->controller = $controller;
return $this;
}
/**
* Get the name of the form.
* @return string
*/
public function getName() {
return $this->name;
}
/**
* Set the name of the form.
* @param string $name
* @return Form
*/
public function setName($name) {
$this->name = $name;
return $this;
}
/**
* Returns an object where there is a method with the same name as each data field on the form.
* That method will return the field itself.
* It means that you can execute $firstNameField = $form->FieldMap()->FirstName(), which can be handy
*/
public function FieldMap() {
return new Form_FieldMap($this);
}
/**
* The next functions store and modify the forms
* message attributes. messages are stored in session under
* $_SESSION[formname][message];
*
* @return string
*/
public function Message() {
$this->getMessageFromSession();
return $this->message;
}
/**
* @return string
*/
public function MessageType() {
$this->getMessageFromSession();
return $this->messageType;
}
protected function getMessageFromSession() {
if($this->message || $this->messageType) {
return $this->message;
}else{
$this->message = Session::get("FormInfo.{$this->FormName()}.formError.message");
$this->messageType = Session::get("FormInfo.{$this->FormName()}.formError.type");
}
}
/**
* Set a status message for the form.
*
* @param message the text of the message
* @param type Should be set to good, bad, or warning.
*/
public function setMessage($message, $type) {
$this->message = $message;
$this->messageType = $type;
return $this;
}
/**
* Set a message to the session, for display next time this form is shown.
*
* @param message the text of the message
* @param type Should be set to good, bad, or warning.
*/
public function sessionMessage($message, $type) {
Session::set("FormInfo.{$this->FormName()}.formError.message", $message);
Session::set("FormInfo.{$this->FormName()}.formError.type", $type);
}
public static function messageForForm( $formName, $message, $type ) {
Session::set("FormInfo.{$formName}.formError.message", $message);
Session::set("FormInfo.{$formName}.formError.type", $type);
}
public function clearMessage() {
$this->message = null;
Session::clear("FormInfo.{$this->FormName()}.errors");
Session::clear("FormInfo.{$this->FormName()}.formError");
Session::clear("FormInfo.{$this->FormName()}.data");
}
public function resetValidation() {
Session::clear("FormInfo.{$this->FormName()}.errors");
Session::clear("FormInfo.{$this->FormName()}.data");
}
/**
* Returns the DataObject that has given this form its data
* through {@link loadDataFrom()}.
*
* @return DataObject
*/
public function getRecord() {
return $this->record;
}
/**
* Get the legend value to be inserted into the
* <legend> element in Form.ss
*
* @return string
*/
public function getLegend() {
return $this->legend;
}
/**
* Processing that occurs before a form is executed.
* This includes form validation, if it fails, we redirect back
* to the form with appropriate error messages.
* Triggered through {@link httpSubmission()}.
* Note that CSRF protection takes place in {@link httpSubmission()},
* if it fails the form data will never reach this method.