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Editing: FieldsHelper.php

<?php
/**
 * @package     Joomla.Administrator
 * @subpackage  com_fields
 *
 * @copyright   (C) 2018 Open Source Matters, Inc. <https://www.joomla.org>
 * @license     GNU General Public License version 2 or later; see LICENSE.txt
 */

namespace Joomla\Component\Fields\Administrator\Helper;

\defined('_JEXEC') or die;

use Joomla\CMS\Factory;
use Joomla\CMS\Fields\FieldsServiceInterface;
use Joomla\CMS\Form\Form;
use Joomla\CMS\Form\FormHelper;
use Joomla\CMS\Language\Multilanguage;
use Joomla\CMS\Layout\LayoutHelper;
use Joomla\CMS\Object\CMSObject;
use Joomla\CMS\Plugin\PluginHelper;
use Joomla\Component\Fields\Administrator\Model\FieldsModel;
use Joomla\Database\ParameterType;

/**
 * FieldsHelper
 *
 * @since  3.7.0
 */
class FieldsHelper
{
	/**
	 * @var    FieldsModel
	 */
	private static $fieldsCache = null;

/**
	 * @var    FieldsModel
	 */
	private static $fieldCache = null;

/**
	 * Extracts the component and section from the context string which has to
	 * be in the format component.context.
	 *
	 * @param   string  $contextString  contextString
	 * @param   object  $item           optional item object
	 *
	 * @return  array|null
	 *
	 * @since   3.7.0
	 */
	public static function extract($contextString, $item = null)
	{
		$parts = explode('.', $contextString, 2);

if (count($parts) < 2)
		{
			return null;
		}

$newSection = '';

$component = Factory::getApplication()->bootComponent($parts[0]);

if ($component instanceof FieldsServiceInterface)
		{
			$newSection = $component->validateSection($parts[1], $item);
		}

if ($newSection)
		{
			$parts[1] = $newSection;
		}

return $parts;
	}

/**
	 * Returns the fields for the given context.
	 * If the item is an object the returned fields do have an additional field
	 * "value" which represents the value for the given item. If the item has an
	 * assigned_cat_ids field, then additionally fields which belong to that
	 * category will be returned.
	 * Should the value being prepared to be shown in an HTML context then
	 * prepareValue must be set to true. No further escaping needs to be done.
	 * The values of the fields can be overridden by an associative array where the keys
	 * have to be a name and its corresponding value.
	 *
	 * @param   string     $context           The context of the content passed to the helper
	 * @param   \stdClass  $item              item
	 * @param   int|bool   $prepareValue      (if int is display event): 1 - AfterTitle, 2 - BeforeDisplay, 3 - AfterDisplay, 0 - OFF
	 * @param   array      $valuesToOverride  The values to override
	 *
	 * @return  array
	 *
	 * @since   3.7.0
	 */
	public static function getFields($context, $item = null, $prepareValue = false, array $valuesToOverride = null)
	{
		if (self::$fieldsCache === null)
		{
			// Load the model
			self::$fieldsCache = Factory::getApplication()->bootComponent('com_fields')
				->getMVCFactory()->createModel('Fields', 'Administrator', ['ignore_request' => true]);

self::$fieldsCache->setState('filter.state', 1);
			self::$fieldsCache->setState('list.limit', 0);
		}

if (is_array($item))
		{
			$item = (object) $item;
		}

if (Multilanguage::isEnabled() && isset($item->language) && $item->language != '*')
		{
			self::$fieldsCache->setState('filter.language', array('*', $item->language));
		}

self::$fieldsCache->setState('filter.context', $context);
		self::$fieldsCache->setState('filter.assigned_cat_ids', array());

/*
		 * If item has assigned_cat_ids parameter display only fields which
		 * belong to the category
		 */
		if ($item && (isset($item->catid) || isset($item->fieldscatid)))
		{
			$assignedCatIds = $item->catid ?? $item->fieldscatid;

if (!is_array($assignedCatIds))
			{
				$assignedCatIds = explode(',', $assignedCatIds);
			}

// Fields without any category assigned should show as well
			$assignedCatIds[] = 0;

self::$fieldsCache->setState('filter.assigned_cat_ids', $assignedCatIds);
		}

$fields = self::$fieldsCache->getItems();

if ($fields === false)
		{
			return array();
		}

if ($item && isset($item->id))
		{
			if (self::$fieldCache === null)
			{
				self::$fieldCache = Factory::getApplication()->bootComponent('com_fields')
					->getMVCFactory()->createModel('Field', 'Administrator', ['ignore_request' => true]);
			}

$fieldIds = array_map(
				function ($f)
				{
					return $f->id;
				},
				$fields
			);

$fieldValues = self::$fieldCache->getFieldValues($fieldIds, $item->id);

$new = array();

foreach ($fields as $key => $original)
			{
				/*
				 * Doing a clone, otherwise fields for different items will
				 * always reference to the same object
				 */
				$field = clone $original;

if ($valuesToOverride && array_key_exists($field->name, $valuesToOverride))
				{
					$field->value = $valuesToOverride[$field->name];
				}
				elseif ($valuesToOverride && array_key_exists($field->id, $valuesToOverride))
				{
					$field->value = $valuesToOverride[$field->id];
				}
				elseif (array_key_exists($field->id, $fieldValues))
				{
					$field->value = $fieldValues[$field->id];
				}

if (!isset($field->value) || $field->value === '')
				{
					$field->value = $field->default_value;
				}

$field->rawvalue = $field->value;

// If boolean prepare, if int, it is the event type: 1 - After Title, 2 - Before Display, 3 - After Display, 0 - Do not prepare
				if ($prepareValue && (is_bool($prepareValue) || $prepareValue === (int) $field->params->get('display', '2')))
				{
					PluginHelper::importPlugin('fields');

/*
					 * On before field prepare
					 * Event allow plugins to modify the output of the field before it is prepared
					 */
					Factory::getApplication()->triggerEvent('onCustomFieldsBeforePrepareField', array($context, $item, &$field));

// Gathering the value for the field
					$value = Factory::getApplication()->triggerEvent('onCustomFieldsPrepareField', array($context, $item, &$field));

if (is_array($value))
					{
						$value = implode(' ', $value);
					}

/*
					 * On after field render
					 * Event allows plugins to modify the output of the prepared field
					 */
					Factory::getApplication()->triggerEvent('onCustomFieldsAfterPrepareField', array($context, $item, $field, &$value));

// Assign the value
					$field->value = $value;
				}

$new[$key] = $field;
			}

$fields = $new;
		}

return $fields;
	}

/**
	 * Renders the layout file and data on the context and does a fall back to
	 * Fields afterwards.
	 *
	 * @param   string  $context      The context of the content passed to the helper
	 * @param   string  $layoutFile   layoutFile
	 * @param   array   $displayData  displayData
	 *
	 * @return  NULL|string
	 *
	 * @since  3.7.0
	 */
	public static function render($context, $layoutFile, $displayData)
	{
		$value = '';

/*
		 * Because the layout refreshes the paths before the render function is
		 * called, so there is no way to load the layout overrides in the order
		 * template -> context -> fields.
		 * If there is no override in the context then we need to call the
		 * layout from Fields.
		 */
		if ($parts = self::extract($context))
		{
			// Trying to render the layout on the component from the context
			$value = LayoutHelper::render($layoutFile, $displayData, null, array('component' => $parts[0], 'client' => 0));
		}

if ($value == '')
		{
			// Trying to render the layout on Fields itself
			$value = LayoutHelper::render($layoutFile, $displayData, null, array('component' => 'com_fields','client' => 0));
		}

return $value;
	}

/**
	 * PrepareForm
	 *
	 * @param   string  $context  The context of the content passed to the helper
	 * @param   Form    $form     form
	 * @param   object  $data     data.
	 *
	 * @return  boolean
	 *
	 * @since   3.7.0
	 */
	public static function prepareForm($context, Form $form, $data)
	{
		// Extracting the component and section
		$parts = self::extract($context);

if (! $parts)
		{
			return true;
		}

$context = $parts[0] . '.' . $parts[1];

// When no fields available return here
		$fields = self::getFields($parts[0] . '.' . $parts[1], new CMSObject);

if (! $fields)
		{
			return true;
		}

$component = $parts[0];
		$section   = $parts[1];

$assignedCatids = $data->catid ?? $data->fieldscatid ?? $form->getValue('catid');

// Account for case that a submitted form has a multi-value category id field (e.g. a filtering form), just use the first category
		$assignedCatids = is_array($assignedCatids)
			? (int) reset($assignedCatids)
			: (int) $assignedCatids;

if (!$assignedCatids && $formField = $form->getField('catid'))
		{
			$assignedCatids = $formField->getAttribute('default', null);

if (!$assignedCatids)
			{
				// Choose the first category available
				$catOptions = $formField->options;

if ($catOptions && !empty($catOptions[0]->value))
				{
					$assignedCatids = (int) $catOptions[0]->value;
				}
			}

$data->fieldscatid = $assignedCatids;
		}

/*
		 * If there is a catid field we need to reload the page when the catid
		 * is changed
		 */
		if ($form->getField('catid') && $parts[0] != 'com_fields')
		{
			/*
			 * Setting some parameters for the category field
			 */
			$form->setFieldAttribute('catid', 'refresh-enabled', true);
			$form->setFieldAttribute('catid', 'refresh-cat-id', $assignedCatids);
			$form->setFieldAttribute('catid', 'refresh-section', $section);
		}

// Getting the fields
		$fields = self::getFields($parts[0] . '.' . $parts[1], $data);

if (!$fields)
		{
			return true;
		}

$fieldTypes = self::getFieldTypes();

// Creating the dom
		$xml = new \DOMDocument('1.0', 'UTF-8');
		$fieldsNode = $xml->appendChild(new \DOMElement('form'))->appendChild(new \DOMElement('fields'));
		$fieldsNode->setAttribute('name', 'com_fields');

// Organizing the fields according to their group
		$fieldsPerGroup = array(0 => array());

foreach ($fields as $field)
		{
			if (!array_key_exists($field->type, $fieldTypes))
			{
				// Field type is not available
				continue;
			}

if (!array_key_exists($field->group_id, $fieldsPerGroup))
			{
				$fieldsPerGroup[$field->group_id] = array();
			}

if ($path = $fieldTypes[$field->type]['path'])
			{
				// Add the lookup path for the field
				FormHelper::addFieldPath($path);
			}

if ($path = $fieldTypes[$field->type]['rules'])
			{
				// Add the lookup path for the rule
				FormHelper::addRulePath($path);
			}

$fieldsPerGroup[$field->group_id][] = $field;
		}

$model = Factory::getApplication()->bootComponent('com_fields')
			->getMVCFactory()->createModel('Groups', 'Administrator', ['ignore_request' => true]);
		$model->setState('filter.context', $context);

/**
		 * $model->getItems() would only return existing groups, but we also
		 * have the 'default' group with id 0 which is not in the database,
		 * so we create it virtually here.
		 */
		$defaultGroup = new \stdClass;
		$defaultGroup->id = 0;
		$defaultGroup->title = '';
		$defaultGroup->description = '';
		$iterateGroups = array_merge(array($defaultGroup), $model->getItems());

// Looping through the groups
		foreach ($iterateGroups as $group)
		{
			if (empty($fieldsPerGroup[$group->id]))
			{
				continue;
			}

// Defining the field set
			/** @var \DOMElement $fieldset */
			$fieldset = $fieldsNode->appendChild(new \DOMElement('fieldset'));
			$fieldset->setAttribute('name', 'fields-' . $group->id);
			$fieldset->setAttribute('addfieldpath', '/administrator/components/' . $component . '/models/fields');
			$fieldset->setAttribute('addrulepath', '/administrator/components/' . $component . '/models/rules');

$label       = $group->title;
			$description = $group->description;

if (!$label)
			{
				$key = strtoupper($component . '_FIELDS_' . $section . '_LABEL');

if (!Factory::getLanguage()->hasKey($key))
				{
					$key = 'JGLOBAL_FIELDS';
				}

$label = $key;
			}

if (!$description)
			{
				$key = strtoupper($component . '_FIELDS_' . $section . '_DESC');

if (Factory::getLanguage()->hasKey($key))
				{
					$description = $key;
				}
			}

$fieldset->setAttribute('label', $label);
			$fieldset->setAttribute('description', strip_tags($description));

// Looping through the fields for that context
			foreach ($fieldsPerGroup[$group->id] as $field)
			{
				try
				{
					Factory::getApplication()->triggerEvent('onCustomFieldsPrepareDom', array($field, $fieldset, $form));

/*
					 * If the field belongs to an assigned_cat_id but the assigned_cat_ids in the data
					 * is not known, set the required flag to false on any circumstance.
					 */
					if (!$assignedCatids && !empty($field->assigned_cat_ids) && $form->getField($field->name))
					{
						$form->setFieldAttribute($field->name, 'required', 'false');
					}
				}
				catch (\Exception $e)
				{
					Factory::getApplication()->enqueueMessage($e->getMessage(), 'error');
				}
			}

// When the field set is empty, then remove it
			if (!$fieldset->hasChildNodes())
			{
				$fieldsNode->removeChild($fieldset);
			}
		}

// Loading the XML fields string into the form
		$form->load($xml->saveXML());

$model = Factory::getApplication()->bootComponent('com_fields')
			->getMVCFactory()->createModel('Field', 'Administrator', ['ignore_request' => true]);

if ((!isset($data->id) || !$data->id) && Factory::getApplication()->input->getCmd('controller') == 'modules'
			&& Factory::getApplication()->isClient('site'))
		{
			// Modules on front end editing don't have data and an id set
			$data->id = Factory::getApplication()->input->getInt('id');
		}

// Looping through the fields again to set the value
		if (!isset($data->id) || !$data->id)
		{
			return true;
		}

foreach ($fields as $field)
		{
			$value = $model->getFieldValue($field->id, $data->id);

if ($value === null)
			{
				continue;
			}

if (!is_array($value) && $value !== '')
			{
				// Function getField doesn't cache the fields, so we try to do it only when necessary
				$formField = $form->getField($field->name, 'com_fields');

if ($formField && $formField->forceMultiple)
				{
					$value = (array) $value;
				}
			}

// Setting the value on the field
			$form->setValue($field->name, 'com_fields', $value);
		}

return true;
	}

/**
	 * Return a boolean if the actual logged in user can edit the given field value.
	 *
	 * @param   \stdClass  $field  The field
	 *
	 * @return  boolean
	 *
	 * @since   3.7.0
	 */
	public static function canEditFieldValue($field)
	{
		$parts = self::extract($field->context);

return Factory::getUser()->authorise('core.edit.value', $parts[0] . '.field.' . (int) $field->id);
	}

/**
	 * Return a boolean based on field (and field group) display / show_on settings
	 *
	 * @param   \stdClass  $field  The field
	 *
	 * @return  boolean
	 *
	 * @since   3.8.7
	 */
	public static function displayFieldOnForm($field)
	{
		$app = Factory::getApplication();

// Detect if the field should be shown at all
		if ($field->params->get('show_on') == 1 && $app->isClient('administrator'))
		{
			return false;
		}
		elseif ($field->params->get('show_on') == 2 && $app->isClient('site'))
		{
			return false;
		}

if (!self::canEditFieldValue($field))
		{
			$fieldDisplayReadOnly = $field->params->get('display_readonly', '2');

if ($fieldDisplayReadOnly == '2')
			{
				// Inherit from field group display read-only setting
				$groupModel = $app->bootComponent('com_fields')
					->getMVCFactory()->createModel('Group', 'Administrator', ['ignore_request' => true]);
				$groupDisplayReadOnly = $groupModel->getItem($field->group_id)->params->get('display_readonly', '1');
				$fieldDisplayReadOnly = $groupDisplayReadOnly;
			}

if ($fieldDisplayReadOnly == '0')
			{
				// Do not display field on form when field is read-only
				return false;
			}
		}

// Display field on form
		return true;
	}

/**
	 * Gets assigned categories ids for a field
	 *
	 * @param   \stdClass[]  $fieldId  The field ID
	 *
	 * @return  array  Array with the assigned category ids
	 *
	 * @since   4.0.0
	 */
	public static function getAssignedCategoriesIds($fieldId)
	{
		$fieldId = (int) $fieldId;

if (!$fieldId)
		{
			return array();
		}

$db    = Factory::getDbo();
		$query = $db->getQuery(true);

$query->select($db->quoteName('a.category_id'))
			->from($db->quoteName('#__fields_categories', 'a'))
			->where('a.field_id = ' . $fieldId);

$db->setQuery($query);

return $db->loadColumn();
	}

/**
	 * Gets assigned categories titles for a field
	 *
	 * @param   \stdClass[]  $fieldId  The field ID
	 *
	 * @return  array  Array with the assigned categories
	 *
	 * @since   3.7.0
	 */
	public static function getAssignedCategoriesTitles($fieldId)
	{
		$fieldId = (int) $fieldId;

if (!$fieldId)
		{
			return [];
		}

$db    = Factory::getDbo();
		$query = $db->getQuery(true);

$query->select($db->quoteName('c.title'))
			->from($db->quoteName('#__fields_categories', 'a'))
			->join('INNER', $db->quoteName('#__categories', 'c') . ' ON a.category_id = c.id')
			->where($db->quoteName('field_id') . ' = :fieldid')
			->bind(':fieldid', $fieldId, ParameterType::INTEGER);

$db->setQuery($query);

return $db->loadColumn();
	}

/**
	 * Gets the fields system plugin extension id.
	 *
	 * @return  integer  The fields system plugin extension id.
	 *
	 * @since   3.7.0
	 */
	public static function getFieldsPluginId()
	{
		$db    = Factory::getDbo();
		$query = $db->getQuery(true)
			->select($db->quoteName('extension_id'))
			->from($db->quoteName('#__extensions'))
			->where($db->quoteName('folder') . ' = ' . $db->quote('system'))
			->where($db->quoteName('element') . ' = ' . $db->quote('fields'));
		$db->setQuery($query);

try
		{
			$result = (int) $db->loadResult();
		}
		catch (\RuntimeException $e)
		{
			Factory::getApplication()->enqueueMessage($e->getMessage(), 'error');
			$result = 0;
		}

return $result;
	}

/**
	 * Loads the fields plugins and returns an array of field types from the plugins.
	 *
	 * The returned array contains arrays with the following keys:
	 * - label: The label of the field
	 * - type:  The type of the field
	 * - path:  The path of the folder where the field can be found
	 *
	 * @return  array
	 *
	 * @since   3.7.0
	 */
	public static function getFieldTypes()
	{
		PluginHelper::importPlugin('fields');
		$eventData = Factory::getApplication()->triggerEvent('onCustomFieldsGetTypes');

$data = array();

foreach ($eventData as $fields)
		{
			foreach ($fields as $fieldDescription)
			{
				if (!array_key_exists('path', $fieldDescription))
				{
					$fieldDescription['path'] = null;
				}

if (!array_key_exists('rules', $fieldDescription))
				{
					$fieldDescription['rules'] = null;
				}

$data[$fieldDescription['type']] = $fieldDescription;
			}
		}

return $data;
	}

/**
	 * Clears the internal cache for the custom fields.
	 *
	 * @return  void
	 *
	 * @since   3.8.0
	 */
	public static function clearFieldsCache()
	{
		self::$fieldCache  = null;
		self::$fieldsCache = null;
	}
}

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