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<?php

/**
 * @defgroup form Form
 * Implements a toolkit for the server-side implementation of forms, including
 * initializing forms with presets, reading submitted content, validating
 * content, and saving the results.
 */

/**
 * @file classes/form/Form.inc.php
 *
 * Copyright (c) 2014-2021 Simon Fraser University
 * Copyright (c) 2000-2021 John Willinsky
 * Distributed under the GNU GPL v3. For full terms see the file docs/COPYING.
 *
 * @class Form
 * @ingroup core
 *
 * @brief Class defining basic operations for handling HTML forms.
 */

import('lib.pkp.classes.form.FormError');
import('lib.pkp.classes.form.FormBuilderVocabulary');

// Import all form validators for convenient use in sub-classes
import('lib.pkp.classes.form.validation.FormValidatorUsername');
import('lib.pkp.classes.form.validation.FormValidatorArray');
import('lib.pkp.classes.form.validation.FormValidatorArrayCustom');
import('lib.pkp.classes.form.validation.FormValidatorBoolean');
import('lib.pkp.classes.form.validation.FormValidatorControlledVocab');
import('lib.pkp.classes.form.validation.FormValidatorCustom');
import('lib.pkp.classes.form.validation.FormValidatorReCaptcha');
import('lib.pkp.classes.form.validation.FormValidatorEmail');
import('lib.pkp.classes.form.validation.FormValidatorInSet');
import('lib.pkp.classes.form.validation.FormValidatorLength');
import('lib.pkp.classes.form.validation.FormValidatorLocale');
import('lib.pkp.classes.form.validation.FormValidatorLocaleEmail');
import('lib.pkp.classes.form.validation.FormValidatorCSRF');
import('lib.pkp.classes.form.validation.FormValidatorPost');
import('lib.pkp.classes.form.validation.FormValidatorRegExp');
import('lib.pkp.classes.form.validation.FormValidatorUrl');
import('lib.pkp.classes.form.validation.FormValidatorLocaleUrl');
import('lib.pkp.classes.form.validation.FormValidatorISSN');
import('lib.pkp.classes.form.validation.FormValidatorORCID');

class Form {

	/** The template file containing the HTML form */
	var $_template;

	/** Associative array containing form data */
	var $_data;

	/** Validation checks for this form */
	var $_checks;

	/** Errors occurring in form validation */
	var $_errors;

	/** Array of field names where an error occurred and the associated error message */
	var $errorsArray;

	/** Array of field names where an error occurred */
	var $errorFields;

	/** Array of errors for the form section currently being processed */
	var $formSectionErrors;

	/** Client-side validation rules **/
	var $cssValidation;

	/** @var string Symbolic name of required locale */
	var $requiredLocale;

	/** @var array Set of supported locales */
	var $supportedLocales;

	/** @var string Default form locale */
	var $defaultLocale;

	/**
	 * Constructor.
	 * @param $template string the path to the form template file
	 */
	function __construct($template = null, $callHooks = true, $requiredLocale = null, $supportedLocales = null) {

		if ($requiredLocale === null) $requiredLocale = AppLocale::getPrimaryLocale();
		$this->requiredLocale = $requiredLocale;
		if ($supportedLocales === null) $supportedLocales = AppLocale::getSupportedFormLocales();
		$this->supportedLocales = $supportedLocales;

		$this->defaultLocale = AppLocale::getLocale();

		$this->_template = $template;
		$this->_data = array();
		$this->_checks = array();
		$this->_errors = array();
		$this->errorsArray = array();
		$this->errorFields = array();
		$this->formSectionErrors = array();

		if ($callHooks === true) {
			// Call hooks based on the calling entity, assuming
			// this method is only called by a subclass. Results
			// in hook calls named e.g. "papergalleyform::Constructor"
			// Note that class names are always lower case.
			HookRegistry::call(strtolower_codesafe(get_class($this)) . '::Constructor', array($this, &$template));
		}
	}


	//
	// Setters and Getters
	//
	/**
	 * Set the template
	 * @param $template string
	 */
	function setTemplate($template) {
		$this->_template = $template;
	}

	/**
	 * Get the template
	 * @return string
	 */
	function getTemplate() {
		return $this->_template;
	}

	/**
	 * Get the required locale for this form (i.e. the locale for which
	 * required fields must be set, all others being optional)
	 * @return string
	 */
	function getRequiredLocale() {
		return $this->requiredLocale;
	}

	//
	// Public Methods
	//
	/**
	 * Display the form.
	 * @param $request PKPRequest
	 * @param $template string the template to be rendered, mandatory
	 *  if no template has been specified on class instantiation.
	 */
	function display($request = null, $template = null) {
		$this->fetch($request, $template, true);
	}

	/**
	 * Returns a string of the rendered form
	 * @param $request PKPRequest
	 * @param $template string the template to be rendered, mandatory
	 *  if no template has been specified on class instantiation.
	 * @param $display boolean
	 * @return string the rendered form
	 */
	function fetch($request, $template = null, $display = false) {
		// Set custom template.
		if (!is_null($template)) $this->_template = $template;

		// Call hooks based on the calling entity, assuming
		// this method is only called by a subclass. Results
		// in hook calls named e.g. "papergalleyform::display"
		// Note that class names are always lower case.
		$returner = null;
		if (HookRegistry::call(strtolower_codesafe(get_class($this)) . '::display', array($this, &$returner))) {
			return $returner;
		}

		$templateMgr = TemplateManager::getManager($request);
		$templateMgr->setCacheability(CACHEABILITY_NO_STORE);


		// Attach this form object to the Form Builder Vocabulary for validation to work
		$fbv = $templateMgr->getFBV();
		$fbv->setForm($this);

		$templateMgr->assign(array_merge(
			$this->_data,
			array(
				'isError' => !$this->isValid(),
				'errors' => $this->getErrorsArray(),
				'formLocales' => $this->supportedLocales,
				'formLocale' => $this->getDefaultFormLocale(),
			)
		));

		if ($display) {
			$templateMgr->display($this->_template);
			$returner = null;
		} else {
			$returner = $templateMgr->fetch($this->_template);
		}

		// Reset the FBV's form in case template manager fetches another template not within a form.
		$fbv->setForm(null);

		return $returner;
	}

	/**
	 * Get the value of a form field.
	 * @param $key string
	 * @return mixed
	 */
	function getData($key) {
		return isset($this->_data[$key]) ? $this->_data[$key] : null;
	}

	/**
	 * Set the value of one or several form fields.
	 * @param $key string|array If a string, then set a single field. If an associative array, then set many.
	 * @param $value mixed
	 */
	function setData($key, $value = null) {
		if (is_array($key)) foreach($key as $aKey => $aValue) {
			$this->setData($aKey, $aValue);
		} else {
			$this->_data[$key] = $value;
		}
	}

	/**
	 * Initialize form data for a new form.
	 */
	function initData() {
		// Call hooks based on the calling entity, assuming
		// this method is only called by a subclass. Results
		// in hook calls named e.g. "papergalleyform::initData"
		// Note that class and function names are always lower
		// case.
		HookRegistry::call(strtolower_codesafe(get_class($this) . '::initData'), array($this));
	}

	/**
	 * Assign form data to user-submitted data.
	 * Can be overridden from subclasses.
	 */
	function readInputData() {
		// Default implementation does nothing.
	}

	/**
	 * Validate form data.
	 * @param $callHooks boolean True (default) iff hooks are to be called.
	 */
	function validate($callHooks = true) {
		if (!isset($this->errorsArray)) {
			$this->getErrorsArray();
		}

		foreach ($this->_checks as $check) {
			if (!isset($this->errorsArray[$check->getField()]) && !$check->isValid()) {
				if (method_exists($check, 'getErrorFields') && method_exists($check, 'isArray') && call_user_func(array(&$check, 'isArray'))) {
					$errorFields = call_user_func(array(&$check, 'getErrorFields'));
					for ($i=0, $count=count($errorFields); $i < $count; $i++) {
						$this->addError($errorFields[$i], $check->getMessage());
						$this->errorFields[$errorFields[$i]] = 1;
					}
				} else {
					$this->addError($check->getField(), $check->getMessage());
					$this->errorFields[$check->getField()] = 1;
				}
			}
		}

		if ($callHooks === true) {
			// Call hooks based on the calling entity, assuming
			// this method is only called by a subclass. Results
			// in hook calls named e.g. "papergalleyform::validate"
			// Note that class and function names are always lower
			// case.
			$value = null;
			if (HookRegistry::call(strtolower_codesafe(get_class($this) . '::validate'), array($this, &$value))) {
				return $value;
			}
		}

		if (!defined('SESSION_DISABLE_INIT')) {
			$request = Application::get()->getRequest();
			$user = $request->getUser();

			if (!$this->isValid() && $user) {
				// Create a form error notification.
				import('classes.notification.NotificationManager');
				$notificationManager = new NotificationManager();
				$notificationManager->createTrivialNotification(
					$user->getId(), NOTIFICATION_TYPE_FORM_ERROR, array('contents' => $this->getErrorsArray())
				);
			}
		}

		return $this->isValid();
	}

	/**
	 * Execute the form's action.
	 * (Note that it is assumed that the form has already been validated.)
	 * @param mixed $functionArgs,... Arguments from the caller to be passed to the hook consumer
	 * @return mixed Result from the consumer to be passed to the caller.  Send a true-ish result if you want the caller to do something with the return value.
	 */
	function execute(...$functionArgs) {
		// Call hooks based on the calling entity, assuming
		// this method is only called by a subclass. Results
		// in hook calls named e.g. "papergalleyform::execute"
		// Note that class and function names are always lower
		// case.
		$returner = null;
		HookRegistry::call(strtolower_codesafe(get_class($this) . '::execute'), array_merge(array($this), $functionArgs, array(&$returner)));
		return $returner;
	}

	/**
	 * Get the list of field names that need to support multiple locales
	 * @return array
	 */
	function getLocaleFieldNames() {
		// Call hooks based on the calling entity, assuming
		// this method is only called by a subclass. Results
		// in hook calls named e.g. "papergalleyform::getLocaleFieldNames"
		// Note that class and function names are always lower
		// case.
		$returner = array();
		HookRegistry::call(strtolower_codesafe(get_class($this) . '::getLocaleFieldNames'), array($this, &$returner));
		return $returner;
	}

	/**
	 * Get the default form locale.
	 * @return string
	 */
	function getDefaultFormLocale() {
		$formLocale = $this->defaultLocale;
		if (!isset($this->supportedLocales[$formLocale])) $formLocale = $this->requiredLocale;
		return $formLocale;
	}

	/**
	 * Set the default form locale.
	 * @param $defaultLocale string
	 */
	function setDefaultFormLocale($defaultLocale) {
		$this->defaultLocale = $defaultLocale;
	}

	/**
	 * Add a supported locale.
	 * @param $supportedLocale string
	 */
	function addSupportedFormLocale($supportedLocale) {
		if (!in_array($supportedLocale, $this->supportedLocales)) {
			$site = Application::get()->getRequest()->getSite();
			$siteSupportedLocales = $site->getSupportedLocaleNames();
			if (array_key_exists($supportedLocale, $siteSupportedLocales)) {
				$this->supportedLocales[$supportedLocale] = $siteSupportedLocales[$supportedLocale];
			}
		}
	}

	/**
	 * Adds specified user variables to input data.
	 * @param $vars array the names of the variables to read
	 */
	function readUserVars($vars) {
		// Call hooks based on the calling entity, assuming
		// this method is only called by a subclass. Results
		// in hook calls named e.g. "papergalleyform::readUserVars"
		// Note that class and function names are always lower
		// case.
		HookRegistry::call(strtolower_codesafe(get_class($this) . '::readUserVars'), array($this, &$vars));
		$request = Application::get()->getRequest();
		foreach ($vars as $k) {
			$this->setData($k, $request->getUserVar($k));
		}
	}

	/**
	 * Add a validation check to the form.
	 * @param $formValidator FormValidator
	 */
	function addCheck($formValidator) {
		$this->_checks[] =& $formValidator;
	}

	/**
	 * Add an error to the form.
	 * Errors are typically assigned as the form is validated.
	 * @param $field string the name of the field where the error occurred
	 */
	function addError($field, $message) {
		$this->_errors[] = new FormError($field, $message);
	}

	/**
	 * Add an error field for highlighting on form
	 * @param $field string the name of the field where the error occurred
	 */
	function addErrorField($field) {
		$this->errorFields[$field] = 1;
	}

	/**
	 * Check if form passes all validation checks.
	 * @return boolean
	 */
	function isValid() {
		return empty($this->_errors);
	}

	/**
	 * Return set of errors that occurred in form validation.
	 * If multiple errors occurred processing a single field, only the first error is included.
	 * @return array erroneous fields and associated error messages
	 */
	function getErrorsArray() {
		$this->errorsArray = array();
		foreach ($this->_errors as $error) {
			if (!isset($this->errorsArray[$error->getField()])) {
				$this->errorsArray[$error->getField()] = $error->getMessage();
			}
		}
		return $this->errorsArray;
	}

	//
	// Private helper methods
	//
	/**
	 * Convert PHP variable (literals or arrays) into HTML containing
	 * hidden input fields.
	 * @param $name string Name of variable
	 * @param $value mixed Value of variable
	 * @param $stack array Names of array keys (for recursive calling)
	 * @return string HTML hidden form elements describing the parameters.
	 */
	function _decomposeArray($name, $value, $stack) {
		$returner = '';
		if (is_array($value)) {
			foreach ($value as $key => $subValue) {
				$newStack = $stack;
				$newStack[] = $key;
				$returner .= $this->_decomposeArray($name, $subValue, $newStack);
			}
		} else {
			$name = htmlentities($name, ENT_COMPAT, LOCALE_ENCODING);
			$value = htmlentities($value, ENT_COMPAT, LOCALE_ENCODING);
			$returner .= '<input type="hidden" name="' . $name;
			while (($item = array_shift($stack)) !== null) {
				$item = htmlentities($item, ENT_COMPAT, LOCALE_ENCODING);
				$returner .= '[' . $item . ']';
			}
			$returner .= '" value="' . $value . "\" />\n";
		}
		return $returner;
	}
}

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