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form.php
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<?php
namespace Grav\Plugin;
use Composer\Autoload\ClassLoader;
use DateTime;
use Doctrine\Common\Cache\Cache;
use Exception;
use Grav\Common\Data\ValidationException;
use Grav\Common\Debugger;
use Grav\Common\Filesystem\Folder;
use Grav\Common\Grav;
use Grav\Common\Page\Interfaces\PageInterface;
use Grav\Common\Page\Pages;
use Grav\Common\Page\Types;
use Grav\Common\Plugin;
use Grav\Common\Twig\Twig;
use Grav\Common\Utils;
use Grav\Common\Uri;
use Grav\Common\Yaml;
use Grav\Framework\Form\Interfaces\FormInterface;
use Grav\Framework\Psr7\Response;
use Grav\Framework\Route\Route;
use Grav\Plugin\Form\Form;
use Grav\Plugin\Form\Forms;
use Grav\Plugin\Form\TwigExtension;
use ReCaptcha\ReCaptcha;
use ReCaptcha\RequestMethod\CurlPost;
use RecursiveArrayIterator;
use RecursiveIteratorIterator;
use RocketTheme\Toolbox\File\JsonFile;
use RocketTheme\Toolbox\File\YamlFile;
use RocketTheme\Toolbox\File\File;
use RocketTheme\Toolbox\Event\Event;
use RuntimeException;
use Twig\Environment;
use Twig\Extension\CoreExtension;
use Twig\Extension\EscaperExtension;
use Twig\TwigFunction;
use function count;
use function function_exists;
use function is_array;
use function is_string;
use function sprintf;
/**
* Class FormPlugin
* @package Grav\Plugin
*/
class FormPlugin extends Plugin
{
/** @var array */
public $features = [
'blueprints' => 1000
];
/** @var Form */
protected $form;
/** @var array[]|FormInterface[] */
protected $forms = [];
/** @var FormInterface[] */
protected $active_forms = [];
/** @var array */
protected $json_response = [];
/** @var bool */
protected $recache_forms = false;
/**
* @return bool
*/
public static function checkRequirements(): bool
{
return version_compare(GRAV_VERSION, '1.7', '>');
}
/**
* @return array
*/
public static function getSubscribedEvents()
{
if (!static::checkRequirements()) {
return [];
}
return [
'onPluginsInitialized' => ['onPluginsInitialized', 0],
'onTwigExtensions' => ['onTwigExtensions', 0],
'onTwigTemplatePaths' => ['onTwigTemplatePaths', 0]
];
}
/**
* @return ClassLoader
*/
public function autoload()
{
return require __DIR__ . '/vendor/autoload.php';
}
/**
* Initialize forms from cache if possible
*
* @return void
*/
public function onPluginsInitialized(): void
{
// Backwards compatibility for plugins that use forms.
class_alias(Form::class, 'Grav\Plugin\Form');
$this->grav['forms'] = function () {
$forms = new Forms();
$event = new Event(['forms' => $forms]);
$this->grav->fireEvent('onFormRegisterTypes', $event);
return $forms;
};
if ($this->isAdmin()) {
$this->enable([
'onPageInitialized' => ['onPageInitialized', 0],
'onGetPageTemplates' => ['onGetPageTemplates', 0],
]);
return;
}
/** @var Uri $uri */
$uri = $this->grav['uri'];
// Mini Keep-Alive Logic
$task = $uri->param('task');
if ($task === 'keep-alive') {
$response = new Response(200);
$this->grav->close($response);
}
$this->enable([
'onPageProcessed' => ['onPageProcessed', 0],
'onPagesInitialized' => ['onPagesInitialized', 0],
'onPageInitialized' => ['onPageInitialized', 0],
'onTwigInitialized' => ['onTwigInitialized', 0],
'onTwigPageVariables' => ['onTwigVariables', 0],
'onTwigSiteVariables' => ['onTwigVariables', 0],
'onFormValidationProcessed' => ['onFormValidationProcessed', 0],
]);
}
/**
* @param Event $event
* @return void
*/
public function onGetPageTemplates(Event $event): void
{
/** @var Types $types */
$types = $event->types;
$types->register('form');
}
/**
* Process forms after page header processing, but before caching
*
* @param Event $event
* @return void
*/
public function onPageProcessed(Event $event): void
{
/** @var PageInterface $page */
$page = $event['page'];
$forms = $page->getForms();
if (!$forms) {
return;
}
// Force never_cache_twig if modular form (recursively up)
$current = $page;
while ($current && $current->modularTwig()) {
$header = $current->header();
$header->never_cache_twig = true;
$current = $current->parent();
}
$parent = $current && $current !== $page ? $current : null;
// If the form was in the modular page, we need to add the form into the parent page as well.
if ($parent) {
$parent->addForms($forms);
}
// Store the page forms in the forms instance
foreach ($forms as $name => $form) {
if ($parent) {
$this->addFormDefinition($parent, $name, $form);
}
$this->addFormDefinition($page, $name, $form);
}
}
/**
* Initialize all the forms
*
* @return void
*/
public function onPagesInitialized(): void
{
$this->loadCachedForms();
}
/**
* Catches form processing if user posts the form.
*
* @return void
*/
public function onPageInitialized(): void
{
$submitted = false;
$this->json_response = [];
// Save cached forms.
if ($this->recache_forms) {
$this->saveCachedForms();
}
/** @var PageInterface $page */
$page = $this->grav['page'];
// Force rebuild form when form has not been built and form cache expired.
// This happens when form cache expires before the page cache
// and then does not trigger 'onPageProcessed' event.
if (!$this->forms) {
$this->onPageProcessed(new Event(['page' => $page]));
}
// Enable form events if there's a POST
if ($this->shouldProcessForm()) {
$this->enable([
'onFormProcessed' => ['onFormProcessed', 0],
'onFormValidationError' => ['onFormValidationError', 0],
'onFormFieldTypes' => ['onFormFieldTypes', 0],
]);
/** @var Uri $uri */
$uri = $this->grav['uri'];
/** @var Forms $forms */
$forms = $this->grav['forms'];
$form = $forms->getActiveForm();
if ($form instanceof Form) {
// Post the form
$isJson = $uri->extension() === 'json';
$task = (string)($uri->post('task') ?? $uri->param('task'));
if ($isJson) {
if ($task === 'store-state') {
$this->json_response = $form->storeState();
} elseif ($task === 'clear-state') {
$this->json_response = $form->clearState();
} elseif ($task === 'file-remove' || $uri->post('__form-file-remover__')) {
$this->json_response = $form->filesSessionRemove();
} elseif ($task === 'file-upload' || $uri->post('__form-file-uploader__')) {
$this->json_response = $form->uploadFiles();
}
}
if (empty($this->json_response)) {
if ($task === 'clear-state') {
$form->getFlash()->delete();
$redirect = $form->getBlueprint()->get('form/clear_redirect_url') ?? $page->route();
$this->grav->redirect($redirect, 303);
} else {
$form->post();
$submitted = true;
}
}
// Return JSON if we're not in form template.
if ($this->json_response && $page->template() !== 'form') {
$status = $this->json_response['status'] ?? null;
$response = new Response(
$status !== 'error' ? 200 : 400,
['Content-Type' => 'application/json'],
json_encode($this->json_response, JSON_THROW_ON_ERROR)
);
$this->grav->close($response);
}
}
// Clear flash objects for previously uploaded files
// whenever the user switches page / reloads
// ignoring any JSON / extension call
if (!$submitted && null === $uri->extension()) {
// Discard any previously uploaded files session.
// and if there were any uploaded file, remove them from the filesystem
if ($flash = $this->grav['session']->getFlashObject('files-upload')) {
$flash = new RecursiveIteratorIterator(new RecursiveArrayIterator($flash));
foreach ($flash as $key => $value) {
if ($key !== 'tmp_name') {
continue;
}
@unlink($value);
}
}
}
} else {
// There is no active form to be posted.
// Check all the forms for the current page; we are looking for forms with remember state turned on with random unique id.
/** @var Forms $forms */
$forms = $this->grav['forms'];
/** @var Route $route */
$route = $this->grav['route'];
$pageForms = $this->forms[$route->getRoute()] ?? [];
/**
* @var string $name
* @var array|FormInterface $form
*/
foreach ($pageForms as $name => $form) {
if (is_array($form)) {
$form = $this->createForm($page, $name, $form);
}
if (!$form instanceof FormInterface) {
continue;
}
if ($form->get('remember_redirect')) {
// Found one; we need to check if unique id is set.
$formParam = $form->get('uniqueid_param', 'fid');
$uniqueId = $route->getGravParam($formParam);
if ($uniqueId && preg_match('/[a-z\d]+/', $uniqueId)) {
// URL contains unique id, initialize the current form.
$form->setUniqueId($uniqueId);
$form->initialize();
$forms->setActiveForm($form);
break;
}
// Append unique id to the URL and redirect.
$route = $route->withGravParam($formParam, $form->getUniqueId());
$page->redirect($route->toString());
// TODO: Do we want to add support for multiple forms with remembered state?
break;
}
}
}
}
/**
* Add simple `forms()` Twig function
*
* @return void
*/
public function onTwigInitialized(): void
{
$this->grav['twig']->twig()->addFunction(
new TwigFunction('forms', [$this, 'getForm'])
);
if (Environment::VERSION_ID > 20000) {
// Twig 2/3
$this->grav['twig']->twig()->getExtension(EscaperExtension::class)->setEscaper(
'yaml',
function ($twig, $string, $charset) {
return Yaml::dump($string);
}
);
} else {
// Twig 1.x
$this->grav['twig']->twig()->getExtension(CoreExtension::class)->setEscaper(
'yaml',
function ($twig, $string, $charset) {
return Yaml::dump($string);
}
);
}
}
/**
* @return void
*/
public function onTwigExtensions(): void
{
$this->grav['twig']->twig->addExtension(new TwigExtension());
}
/**
* Add current directory to twig lookup paths.
*
* @return void
*/
public function onTwigTemplatePaths(): void
{
$this->grav['twig']->twig_paths[] = __DIR__ . '/templates';
}
/**
* Make form accessible from twig.
*
* @param Event|null $event
* @return void
*/
public function onTwigVariables(Event $event = null): void
{
if ($event && isset($event['page'])) {
$page = $event['page'];
} else {
$page = $this->grav['page'];
}
$twig = $this->grav['twig'];
if (!isset($twig->twig_vars['form'])) {
$twig->twig_vars['form'] = $this->form($page);
}
if ($this->config->get('plugins.form.built_in_css')) {
$this->grav['assets']->addCss('plugin://form/assets/form-styles.css');
}
$twig->twig_vars['form_max_filesize'] = Form::getMaxFilesize();
$twig->twig_vars['form_json_response'] = $this->json_response;
}
/**
* Handle form processing instructions.
*
* @param Event $event
* @return void
* @throws Exception
*/
public function onFormProcessed(Event $event): void
{
/** @var Form $form */
$form = $event['form'];
$action = $event['action'];
$params = $event['params'];
$this->process($form);
switch ($action) {
case 'captcha':
$captcha_config = $this->config->get('plugins.form.recaptcha');
$secret = $params['recaptcha_secret'] ?? $params['recatpcha_secret'] ?? $captcha_config['secret_key'];
/** @var Uri $uri */
$uri = $this->grav['uri'];
$action = $form->value('action');
$hostname = $uri->host();
$ip = Uri::ip();
$recaptcha = new ReCaptcha($secret);
if (extension_loaded('curl')) {
$recaptcha = new ReCaptcha($secret, new CurlPost());
}
// get captcha version
$captcha_version = $captcha_config['version'] ?? 2;
// Add version 3 specific options
if ($captcha_version == 3) {
$token = $form->value('token');
$resp = $recaptcha
->setExpectedHostname($hostname)
->setExpectedAction($action)
->setScoreThreshold(0.5)
->verify($token, $ip);
} else {
$token = $form->value('g-recaptcha-response', true);
$resp = $recaptcha
->setExpectedHostname($hostname)
->verify($token, $ip);
}
if (!$resp->isSuccess()) {
$errors = $resp->getErrorCodes();
$message = $this->grav['language']->translate('PLUGIN_FORM.ERROR_VALIDATING_CAPTCHA');
$fields = $form->value()->blueprints()->get('form/fields');
foreach ($fields as $field) {
$type = $field['type'] ?? 'text';
$field_message = $field['recaptcha_not_validated'] ?? null;
if ($type === 'captcha' && $field_message) {
$message = $field_message;
break;
}
}
$this->grav->fireEvent('onFormValidationError', new Event([
'form' => $form,
'message' => $message
]));
$this->grav['log']->addWarning('Form reCAPTCHA Errors: [' . $uri->route() . '] ' . json_encode($errors));
$event->stopPropagation();
return;
}
break;
case 'timestamp':
$label = $params['label'] ?? 'Timestamp';
$format = $params['format'] ?? 'Y-m-d H:i:s';
$blueprint = $form->value()->blueprints();
$blueprint->set('form/fields/timestamp', ['name' => 'timestamp', 'label' => $label, 'type' => 'hidden']);
$now = new DateTime('now');
$date_string = $now->format($format);
$form->setFields($blueprint->fields());
$form->setData('timestamp', $date_string);
break;
case 'ip':
$label = $params['label'] ?? 'User IP';
$blueprint = $form->value()->blueprints();
$blueprint->set('form/fields/ip', ['name' => 'ip', 'label' => $label, 'type' => 'hidden']);
$form->setFields($blueprint->fields());
$form->setData('ip', Uri::ip());
break;
case 'message':
$translated_string = $this->grav['language']->translate($params);
$vars = array(
'form' => $form
);
/** @var Twig $twig */
$twig = $this->grav['twig'];
$processed_string = $twig->processString($translated_string, $vars);
$form->message = $processed_string;
break;
case 'redirect':
$this->grav['session']->setFlashObject('form', $form);
$url = ((string)$params);
$vars = array(
'form' => $form
);
/** @var Twig $twig */
$twig = $this->grav['twig'];
$url = $twig->processString($url, $vars);
$message = $form->message;
if ($message) {
$this->grav['messages']->add($form->message, 'success');
}
$event['redirect'] = $url;
$event->stopPropagation();
break;
case 'reset':
if (Utils::isPositive($params)) {
$message = $form->message;
$form->reset();
$form->message = $message;
}
break;
case 'display':
$route = (string)$params;
if (!$route || $route[0] !== '/') {
/** @var Uri $uri */
$uri = $this->grav['uri'];
$route = rtrim($uri->route(), '/') . '/' . ($route ?: '');
}
/** @var Twig $twig */
$twig = $this->grav['twig'];
$twig->twig_vars['form'] = $form;
/** @var Pages $pages */
$pages = $this->grav['pages'];
$page = $pages->dispatch($route, true);
if (!$page) {
throw new RuntimeException('Display page not found. Please check the page exists.', 400);
}
unset($this->grav['page']);
$this->grav['page'] = $page;
break;
case 'remember':
foreach ($params as $remember_field) {
$field_cookie = 'forms-' . $form['name'] . '-' . $remember_field;
setcookie($field_cookie, $form->value($remember_field), time() + 60 * 60 * 24 * 60);
}
break;
case 'upload':
if ($params !== false) {
$form->copyFiles();
}
break;
case 'save':
$prefix = $params['fileprefix'] ?? '';
$format = $params['dateformat'] ?? 'Ymd-His-u';
$raw_format = (bool)($params['dateraw'] ?? false);
$postfix = $params['filepostfix'] ?? '';
$ext = !empty($params['extension']) ? '.' . trim($params['extension'], '.') : '.txt';
$filename = $params['filename'] ?? '';
$folder = !empty($params['folder']) ? $params['folder'] : $form->getName();
$operation = $params['operation'] ?? 'create';
if (!$filename) {
if ($operation === 'add') {
throw new RuntimeException('Form save: \'operation: add\' is only supported with a static filename');
}
$filename = $prefix . $this->udate($format, $raw_format) . $postfix . $ext;
}
/** @var Twig $twig */
$twig = $this->grav['twig'];
$vars = [
'form' => $form
];
// Process with Twig
$filename = $twig->processString($filename, $vars);
$locator = $this->grav['locator'];
$path = $locator->findResource('user-data://', true);
$dir = $path . DS . $folder;
$fullFileName = $dir . DS . $filename;
if (!empty($params['raw']) || !empty($params['template'])) {
// Save data as it comes from the form.
if ($operation === 'add') {
throw new RuntimeException('Form save: \'operation: add\' is not supported for raw files');
}
switch ($ext) {
case '.yaml':
$file = YamlFile::instance($fullFileName);
break;
case '.json':
$file = JsonFile::instance($fullFileName);
break;
default:
throw new RuntimeException('Form save: Unsupported RAW file format, please use either yaml or json');
}
$content = $form->getData();
$data = [
'_data_type' => 'form',
'template' => !empty($params['template']) ? $params['template'] : null,
'name' => $form->getName(),
'timestamp' => date('Y-m-d H:i:s'),
'content' => $content ? $content->toArray() : []
];
$file->lock();
$form->copyFiles();
$file->save(array_filter($data));
break;
}
$file = File::instance($fullFileName);
$file->lock();
$form->copyFiles();
if ($operation === 'create') {
$body = $twig->processString($params['body'] ?? '{% include "forms/data.txt.twig" %}', $vars);
$file->save($body);
} elseif ($operation === 'add') {
if (!empty($params['body'])) {
// use body similar to 'create' action and append to file as a log
$body = $twig->processString($params['body'], $vars);
// create folder if it doesn't exist
if (!file_exists($dir)) {
Folder::create($dir);
}
// append data to existing file
$file->unlock();
file_put_contents($fullFileName, $body, FILE_APPEND | LOCK_EX);
} else {
// serialize YAML out to file for easier parsing as data sets
$vars = $vars['form']->value()->toArray();
foreach ($form->fields as $field) {
if (!empty($field['process']['ignore'])) {
unset($vars[$field['name']]);
}
}
if (file_exists($fullFileName)) {
$data = Yaml::parse($file->content());
if (count($data) > 0) {
array_unshift($data, $vars);
} else {
$data[] = $vars;
}
} else {
$data[] = $vars;
}
$file->save(Yaml::dump($data));
}
}
break;
case 'call':
$callable = $params;
if (is_array($callable) && !method_exists($callable[0], $callable[1])) {
throw new RuntimeException('Form cannot be processed (method does not exist)');
}
if (is_string($callable) && !function_exists($callable)) {
throw new RuntimeException('Form cannot be processed (function does not exist)');
}
$callable($form);
break;
}
}
/**
* Custom field logic can go in here
*
* @param Event $event
* @return void
*/
public function onFormValidationProcessed(Event $event): void
{
// special check for honeypot field
foreach ($event['form']->fields() as $field) {
if ($field['type'] === 'honeypot' && !empty($event['form']->value($field['name']))) {
throw new ValidationException('Are you a bot?');
}
}
}
/**
* Handle form validation error
*
* @param Event $event An event object
* @return void
* @throws Exception
*/
public function onFormValidationError(Event $event): void
{
/** @var FormInterface $form */
$form = $event['form'];
if (isset($event['message'])) {
$form->status = 'error';
$form->message = $event['message'];
$form->messages = $event['messages'];
}
/** @var Uri $uri */
$uri = $this->grav['uri'];
$route = $uri->route();
/** @var Twig $twig */
$twig = $this->grav['twig'];
$twig->twig_vars['form'] = $form;
/** @var Pages $pages */
$pages = $this->grav['pages'];
$page = $pages->find($route, true);
if ($page) {
unset($this->grav['page']);
$this->grav['page'] = $page;
}
$event->stopPropagation();
}
/**
* Add a form definition to the forms plugin
*
* @param PageInterface $page
* @return void
*/
public function addFormDefinition(PageInterface $page, string $name, array $form): void
{
if (!$page->routable()) {
return;
}
$route = $page->home() ? '/' : $page->route();
if (!isset($this->forms[$route][$name])) {
$this->forms[$route][$name] = $form;
$this->recache_forms = true;
}
}
/**
* Add a form to the forms plugin
*
* @param string|null $route
* @param FormInterface|null $form
* @return void
*/
public function addForm(?string $route, ?FormInterface $form): void
{
if (null === $form) {
return;
}
$name = $form->getName();
if (!isset($this->forms[$route][$name])) {
$this->forms[$route][$name] = $form;
$this->recache_forms = true;
}
}
/**
* function to get a specific form
*
* @param string|array|null $data Optional form name or ['name' => $name, 'route' => $route]
* @return FormInterface|null
*/
public function getForm($data = null): ?FormInterface
{
/** @var Pages $pages */
$pages = $this->grav['pages'];
// Handle parameters.
if (is_array($data)) {
$name = (string)($data['name'] ?? '');
$route = (string)($data['route'] ?? '');
} elseif (is_string($data)) {
$name = $data;
$route = '';
} else {
$name = '';
$route = '';
}
// Return always the same form instance.
$form = $this->active_forms[$route][$name] ?? null;
if ($form) {
return $form;
}
$unnamed = $name === '';
$routed = $route !== '';
// Get the page.
if ($routed) {
// Use fixed route for the form.
$route_provided = true;
$page = $pages->find($route);
} else {
// Search form from the current page first.
$route_provided = false;
/** @var PageInterface|null $page */
$page = $this->grav['page'] ?? null;
if ($page) {
$route = $page->route();
} else {
// Get page route with a fallback using current URI if page is not yet initialized.
$route = $this->getCurrentPageRoute();
$page = $pages->find($route);
}
}
// Attempt to find the form from the page.
if ('' !== $route) {
$forms = $this->forms[$route] ?? [];
if (!$unnamed) {
// Get form by the name.
$form = $forms[$name] ?? null;
} else {
// Get the first form.
$form = reset($forms) ?: null;
$name = key($forms);
}
}
// Search the form from the other pages.
if (null === $form) {
// First check if we requested a specific form which didn't exist.
if ($route_provided || $unnamed) {
/** @var Debugger $debugger */
$debugger = $this->grav['debugger'];
$debugger->addMessage(sprintf('Form %s not found in page %s', $name ?? 'unnamed', $route), 'warning');
return null;
}
// Attempt to find any form with given name.
$forms = $this->findFormByName($name);
$first = reset($forms);
if (!$first) {
return null;
}
// Check for naming conflicts.
if (count($forms) > 1) {
$debugger = $this->grav['debugger'];
$debugger->addMessage(sprintf('Fetching form by its name, but there are multiple pages with the same form name %s', $name), 'warning');
}
[$route, $name, $form] = $first;
$page = $pages->find($route);
}
// Form can be saved as an array or an object. If it's an array, we need to create object from it.
if (is_array($form)) {
// Form was cached as an array, try to create the object.
if (null === $page) {
/** @var Debugger $debugger */
$debugger = $this->grav['debugger'];
$debugger->addMessage(sprintf('Form %s cannot be created as page %s does not exist', $name, $route), 'warning');
return null;
}
$form = $this->createForm($page, $name, $form);
}
// Register form to the active forms to get the same instance back next time.
$this->active_forms[$route][$name] = $form;
if ($unnamed) {
$this->active_forms[$route][''] = $form;
}
// Also make aliases if route was not provided to the method.
if (!$routed) {
$this->active_forms[''][$name] = $form;
if ($unnamed) {
$this->active_forms[''][''] = $form;
}
}
return $form;
}
/**
* Get list of form field types specified in this plugin. Only special types needs to be listed.
*
* @return array
*/
public function getFormFieldTypes(): array
{
return [
'avatar' => [
'input@' => false,
'media_field' => true
],
'captcha' => [
'input@' => false
],
'columns' => [
'input@' => false
],
'column' => [
'input@' => false
],
'conditional' => [
'input@' => false
],
'display' => [
'input@' => false
],
'fieldset' => [
'input@' => false
],
'file' => [
'array' => true,
'media_field' => true,
'validate' => [
'type' => 'ignore'
]
],
'formname' => [
'input@' => false
],
'honeypot' => [
'input@' => false
],
'ignore' => [
'input@' => false
],
'key' => [
'input@' => false
],
'section' => [
'input@' => false
],
'spacer' => [
'input@' => false
],
'tabs' => [
'input@' => false
],