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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(!$actions instanceof FieldList) {
throw new InvalidArgumentException('$fields 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, "Sorry, your session has timed out.");
}

// 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->fieldByName('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;
}

/**
* Get a named field from this form's fields.
* It will traverse into composite fields for you, to find the field you want.
* It will only return a data field.
*
* @deprecated 3.0 Use Fields() and FieldList API instead
* @return FormField
*/
public function dataFieldByName($name) {
Deprecation::notice('3.0', 'Use Fields() and FieldList API instead');

foreach($this->getExtraFields() as $field) {
if(!$this->fields->dataFieldByName($field->getName())) $this->fields->push($field);
}

return $this->fields->dataFieldByName($name);
}

/**
* 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;
}

/**
* Unset the form's action button by its name.
*
* @deprecated 3.0 Use Actions() and FieldList API instead
* @param string $name
*/
public function unsetActionByName($name) {
Deprecation::notice('3.0', 'Use Actions() and FieldList API instead');

$this->actions->removeByName($name);
}

/**
* @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;
}

/**
* Unset the form's dataField by its name
*
* @deprecated 3.0 Use Fields() and FieldList API instead
*/
public function unsetDataFieldByName($fieldName){
Deprecation::notice('3.0', 'Use Fields() and FieldList API instead');

foreach($this->Fields()->dataFields() as $child) {
if(is_object($child) && ($child->getName() == $fieldName || $child->Title() == $fieldName)) {
$child = null;
}
}
}

/**
* Remove a field from the given tab.
*
* @deprecated 3.0 Use Fields() and FieldList API instead
*/
public function unsetFieldFromTab($tabName, $fieldName) {
Deprecation::notice('3.0', 'Use Fields() and FieldList API instead');

// Find the tab
$tab = $this->Fields()->findOrMakeTab($tabName);
$tab->removeByName($fieldName);
}

/**
* 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();

// Forms shouldn't be cached, cos their error messages won't be shown
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;
}

/**
* @deprecated 3.0 Please use {@link getEncType}.
*/
public function FormEncType() {
Deprecation::notice('3.0', 'Please use Form->getEncType() instead.');
return $this->getEncType();
}

/**
* 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;
}

/**
* @return string
*/
public function Name() {
Deprecation::notice('3.0', 'Use getName() instead.');
return $this->getName();
}

/**
* 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();
$message = $this->message;
$this->clearMessage();
return $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");

Session::clear("FormInfo.{$this->FormName()}");
}
}

/**
* 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.{$this->FormName()}.formError");
}
public function resetValidation() {
Session::clear("FormInfo.{$this->FormName()}.errors");
}

/**
* 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.
*
* @return boolean
*/
public function validate(){
if($this->validator){
$errors = $this->validator->validate();

if($errors){
// Load errors into session and post back
$data = $this->getData();
Session::set("FormInfo.{$this->FormName()}.errors", $errors);
Session::set("FormInfo.{$this->FormName()}.data", $data);
return false;
}
}
return true;
}

/**
* Load data from the given DataObject or array.
* It will call $object->MyField to get the value of MyField.
* If you passed an array, it will call $object[MyField].
* Doesn't save into dataless FormFields ({@link DatalessField}),
* as determined by {@link FieldList->dataFields()}.
*
* By default, if a field isn't set (as determined by isset()),
* its value will not be saved to the field, retaining
* potential existing values.
*
* Passed data should not be escaped, and is saved to the FormField instances unescaped.
* Escaping happens automatically on saving the data through {@link saveInto()}.
*
* @uses FieldList->dataFields()
* @uses FormField->setValue()
*
* @param array|DataObject $data
* @param boolean $clearMissingFields By default, fields which don't match
* a property or array-key of the passed {@link $data} argument are "left alone",
* meaning they retain any previous values (if present). If this flag is set to true,
* those fields are overwritten with null regardless if they have a match in {@link $data}.
* @param $fieldList An optional list of fields to process. This can be useful when you have a
* form that has some fields that save to one object, and some that save to another.
* @return Form
*/
public function loadDataFrom($data, $clearMissingFields = false, $fieldList = null) {
if(!is_object($data) && !is_array($data)) {
user_error("Form::loadDataFrom() not passed an array or an object", E_USER_WARNING);
return $this;
}

// if an object is passed, save it for historical reference through {@link getRecord()}
if(is_object($data)) $this->record = $data;

// dont include fields without data
$dataFields = $this->fields->dataFields();
if($dataFields) foreach($dataFields as $field) {
$name = $field->getName();

// Skip fields that have been exlcuded
if($fieldList && !in_array($name, $fieldList)) continue;

// First check looks for (fieldname)_unchanged, an indicator that we shouldn't overwrite the field value
if(is_array($data) && isset($data[$name . '_unchanged'])) continue;

// get value in different formats
$hasObjectValue = false;
if(
is_object($data)
&& (
isset($data->$name)
|| $data->hasMethod($name)
|| ($data->hasMethod('hasField') && $data->hasField($name))
)
) {
// We don't actually call the method because it might be slow.
// In a later release, relation methods will just return references to the query that should be
// executed, and so we will be able to safely pass the return value of the relation method to the
// first argument of setValue
$val = $data->__get($name);
$hasObjectValue = true;
} else if(strpos($name,'[') && is_array($data) && !isset($data[$name])) {
// if field is in array-notation, we need to resolve the array-structure PHP creates from query-strings
preg_match('/' . addcslashes($name,'[]') . '=([^&]*)/', urldecode(http_build_query($data)), $matches);
$val = isset($matches[1]) ? $matches[1] : null;
} elseif(is_array($data) && array_key_exists($name, $data)) {
// else we assume its a simple keyed array
$val = $data[$name];
} else {
$val = null;
}

// save to the field if either a value is given, or loading of blank/undefined values is forced
if(isset($val) || $hasObjectValue || $clearMissingFields) {
// pass original data as well so composite fields can act on the additional information
$field->setValue($val, $data);
}
}

return $this;
}

/**
* Save the contents of this form into the given data object.
* It will make use of setCastedField() to do this.
*
* @param $dataObject The object to save data into
* @param $fieldList An optional list of fields to process. This can be useful when you have a
* form that has some fields that save to one object, and some that save to another.
*/
public function saveInto(DataObjectInterface $dataObject, $fieldList = null) {
$dataFields = $this->fields->saveableFields();
$lastField = null;
if($dataFields) foreach($dataFields as $field) {
// Skip fields that have been exlcuded
if($fieldList && is_array($fieldList) && !in_array($field->getName(), $fieldList)) continue;


$saveMethod = "save{$field->getName()}";

if($field->getName() == "ClassName"){
$lastField = $field;
}else if( $dataObject->hasMethod( $saveMethod ) ){
$dataObject->$saveMethod( $field->dataValue());
} else if($field->getName() != "ID"){
$field->saveInto($dataObject);
}
}
if($lastField) $lastField->saveInto($dataObject);
}

/**
* Get the submitted data from this form through
* {@link FieldList->dataFields()}, which filters out
* any form-specific data like form-actions.
* Calls {@link FormField->dataValue()} on each field,
* which returns a value suitable for insertion into a DataObject
* property.
*
* @return array
*/
public function getData() {
$dataFields = $this->fields->dataFields();
$data = array();

if($dataFields){
foreach($dataFields as $field) {
if($field->getName()) {
$data[$field->getName()] = $field->dataValue();
}
}
}
return $data;
}

/**
* Resets a specific field to its passed default value.
* Does NOT clear out all submitted data in the form.
*
* @deprecated 3.0 Use Fields() and FieldList API instead
* @param string $fieldName
* @param mixed $fieldValue
*/
public function resetField($fieldName, $fieldValue = null) {
Deprecation::notice('3.0', 'Use Fields() and FieldList API instead');

$dataFields = $this->fields->dataFields();
if($dataFields) foreach($dataFields as $field) {
if($field->getName()==$fieldName) {
$field = $field->setValue($fieldValue);
}
}
}

/**
* Call the given method on the given field.
* This is used by Ajax-savvy form fields. By putting '&action=callfieldmethod' to the end
* of the form action, they can access server-side data.
* @param fieldName The name of the field. Can be overridden by $_REQUEST[fieldName]
* @param methodName The name of the field. Can be overridden by $_REQUEST[methodName]
*/
public function callfieldmethod($data) {
$fieldName = $data['fieldName'];
$methodName = $data['methodName'];
$fields = $this->fields->dataFields();

// special treatment needed for TableField-class and TreeDropdownField
if(strpos($fieldName, '[')) {
preg_match_all('/([^\[]*)/',$fieldName, $fieldNameMatches);
preg_match_all('/\[([^\]]*)\]/',$fieldName, $subFieldMatches);
$tableFieldName = $fieldNameMatches[1][0];
$subFieldName = $subFieldMatches[1][1];
}

if(isset($tableFieldName) && isset($subFieldName) && is_a($fields[$tableFieldName], 'TableField')) {
$field = $fields[$tableFieldName]->getField($subFieldName, $fieldName);
return $field->$methodName();
} else if(isset($fields[$fieldName])) {
return $fields[$fieldName]->$methodName();
} else {
user_error("Form::callfieldmethod() Field '$fieldName' not found", E_USER_ERROR);
}

}

/**
* Return a rendered version of this form.
*
* This is returned when you access a form as $FormObject rather
* than <% control FormObject %>
*/
public function forTemplate() {
return $this->renderWith(array_merge(
(array)$this->getTemplate(),
array('Form')
));
}

/**
* Return a rendered version of this form, suitable for ajax post-back.
* It triggers slightly different behaviour, such as disabling the rewriting of # links
*/
public function forAjaxTemplate() {
$view = new SSViewer(array(
$this->getTemplate(),
'Form'
));

return $view->dontRewriteHashlinks()->process($this);
}

/**
* Returns an HTML rendition of this form, without the <form> tag itself.
* Attaches 3 extra hidden files, _form_action, _form_name, _form_method, and _form_enctype. These are
* the attributes of the form. These fields can be used to send the form to Ajax.
*/
public function formHtmlContent() {
$this->IncludeFormTag = false;
$content = $this->forTemplate();
$this->IncludeFormTag = true;

$content .= "<input type=\"hidden\" name=\"_form_action\" id=\"" . $this->FormName . "_form_action\""
. " value=\"" . $this->FormAction() . "\" />\n";
$content .= "<input type=\"hidden\" name=\"_form_name\" value=\"" . $this->FormName() . "\" />\n";
$content .= "<input type=\"hidden\" name=\"_form_method\" value=\"" . $this->FormMethod() . "\" />\n";
$content .= "<input type=\"hidden\" name=\"_form_enctype\" value=\"" . $this->FormEncType() . "\" />\n";

return $content;
}

/**
* Render this form using the given template, and return the result as a string
* You can pass either an SSViewer or a template name
*/
public function renderWithoutActionButton($template) {
$custom = $this->customise(array(
"Actions" => "",
));

if(is_string($template)) $template = new SSViewer($template);
return $template->process($custom);
}


/**
* Sets the button that was clicked. This should only be called by the Controller.
* @param funcName The name of the action method that will be called.
*/
public function setButtonClicked($funcName) {
$this->buttonClickedFunc = $funcName;
return $this;
}

public function buttonClicked() {
foreach($this->actions as $action) {
if($this->buttonClickedFunc == $action->actionName()) return $action;
}
}

/**
* Return the default button that should be clicked when another one isn't available
*/
public function defaultAction() {
if($this->hasDefaultAction && $this->actions)
return $this->actions->First();
}

/**
* Disable the default button.
* Ordinarily, when a form is processed and no action_XXX button is available, then the first button in the
* actions list will be pressed. However, if this is "delete", for example, this isn't such a good idea.
*/
public function disableDefaultAction() {
$this->hasDefaultAction = false;
return $this;
}

/**
* Disable the requirement of a security token on this form instance. This security protects
* against CSRF attacks, but you should disable this if you don't want to tie
* a form to a session - eg a search form.
*
* Check for token state with {@link getSecurityToken()} and {@link SecurityToken->isEnabled()}.
*/
public function disableSecurityToken() {
$this->securityToken = new NullSecurityToken();
return $this;
}

/**
* Enable {@link SecurityToken} protection for this form instance.
*
* Check for token state with {@link getSecurityToken()} and {@link SecurityToken->isEnabled()}.
*/
public function enableSecurityToken() {
$this->securityToken = new SecurityToken();
return $this;
}

/**
* Disable security tokens for every form.
* Note that this doesn't apply to {@link SecurityToken}
* instances outside of the Form class, nor applies
* to existing form instances.
*
* See {@link enable_all_security_tokens()}.
*
* @deprecated 2.5 Use SecurityToken::disable()
*/
public static function disable_all_security_tokens() {
Deprecation::notice('2.5', 'Use SecurityToken::disable() instead.');
SecurityToken::disable();
}

/**
* Returns true if security is enabled - that is if the security token
* should be included and checked on this form.
*
* @deprecated 2.5 Use Form->getSecurityToken()->isEnabled()
*
* @return bool
*/
public function securityTokenEnabled() {
Deprecation::notice('2.5', 'Use Form->getSecurityToken()->isEnabled() instead.');
return $this->securityToken->isEnabled();
}

/**
* Returns the security token for this form (if any exists).
* Doesn't check for {@link securityTokenEnabled()}.
* Use {@link SecurityToken::inst()} to get a global token.
*
* @return SecurityToken|null
*/
public function getSecurityToken() {
return $this->securityToken;
}

/**
* Returns the name of a field, if that's the only field that the current controller is interested in.
* It checks for a call to the callfieldmethod action.
* This is useful for optimising your forms
*
* @return string
*/
public static function single_field_required() {
if(self::current_action() == 'callfieldmethod') return $_REQUEST['fieldName'];
}

/**
* Return the current form action being called, if available.
* This is useful for optimising your forms
*/
public static function current_action() {
return self::$current_action;
}

/**
* Set the current form action. Should only be called by Controller.
*/
public static function set_current_action($action) {
self::$current_action = $action;
}

/**
* Compiles all CSS-classes.
*
* @return string
*/
public function extraClass() {
return implode(array_unique($this->extraClasses), ' ');
}

/**
* Add a CSS-class to the form-container. If needed, multiple classes can
* be added by delimiting a string with spaces.
*
* @param string $class A string containing a classname or several class
* names delimited by a single space.
*/
public function addExtraClass($class) {
$classes = explode(' ', $class);

foreach($classes as $class) {
$value = trim($class);

$this->extraClasses[] = $value;
}

return $this;
}

/**
* Remove a CSS-class from the form-container. Multiple class names can
* be passed through as a space delimited string
*
* @param string $class
*/
public function removeExtraClass($class) {
$classes = explode(' ', $class);
$this->extraClasses = array_diff($this->extraClasses, $classes);
return $this;
}

public function debug() {
$result = "<h3>$this->class</h3><ul>";
foreach($this->fields as $field) {
$result .= "<li>$field" . $field->debug() . "</li>";
}
$result .= "</ul>";

if( $this->validator )
$result .= '<h3>'._t('Form.VALIDATOR', 'Validator').'</h3>' . $this->validator->debug();

return $result;
}


/////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// TESTING HELPERS
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////

/**
* Test a submission of this form.
* @return SS_HTTPResponse the response object that the handling controller produces. You can interrogate this in
* your unit test.
*/
public function testSubmission($action, $data) {
$data['action_' . $action] = true;
        
        return Director::test($this->FormAction(), $data, Controller::curr()->getSession());

//$response = $this->controller->run($data);
//return $response;
}

/**
* Test an ajax submission of this form.
* @return SS_HTTPResponse the response object that the handling controller produces. You can interrogate this in
* your unit test.
*/
public function testAjaxSubmission($action, $data) {
$data['ajax'] = 1;
return $this->testSubmission($action, $data);
}
}

/**
* @package forms
* @subpackage core
*/
class Form_FieldMap extends ViewableData {
protected $form;

public function __construct($form) {
$this->form = $form;
parent::__construct();
}

/**
* Ensure that all potential method calls get passed to __call(), therefore to dataFieldByName
*/
public function hasMethod($method) {
return true;
}

public function __call($method, $args = null) {
return $this->form->Fields()->fieldByName($method);
}
}
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