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Current File : /home/u/n/e/uneseuleoc/crid/web/app/plugins/wp-google-maps/includes/class.crud.php
<?php

namespace WPGMZA;

if(!defined('ABSPATH'))
	return;

/**
 * The CRUD class is a base class which acts as an interface between any
 * objects which are stored on in the database and represented in server
 * side logic, for example Map, Marker, Polygon
 */
class Crud extends Factory implements \IteratorAggregate, \JsonSerializable
{
	const SINGLE_READ		= "single-read";
	const BULK_READ			= "bulk-read";
	
	private static $cached_columns_by_table_name;
	private static $cached_column_name_map_by_table_name;

	private $id;
	private $table_name;
	private $fields;
	private $overrides;
	private $modified;
	
	private $trashed = false;

	/**
	 * Constructor
	 * @param string $table_name The table name for this object type
	 * @param int|array|object $id_or_fields The ID of the object to read, or an object or array of data to insert.
	 */
	public function __construct($table_name, $id_or_fields=-1, $read_mode=Crud::SINGLE_READ)
	{
		global $wpdb;
		
		$this->table_name = $table_name;
		Crud::cacheColumnsByTableName($table_name);
		
		$this->fields = array();
		$this->overrides = array();
		
		if(is_object($id_or_fields) || is_array($id_or_fields))
		{
			foreach($id_or_fields as $key => $value)
			{
				if($key == "id")
					continue;
				
				$this->fields[$key] = $value;
			}
			
			$obj = (object)$id_or_fields;
			
			if($read_mode == Crud::BULK_READ)
			{
				if(!isset($obj->id))
					throw new \Exception('Cannot bulk read without ID');
				
				$id = $this->id = $obj->id;
			}
			else if(!isset($obj->id))
				$id = -1;
				
			// NB: Relaxed handling to avoid accidental duplication
			if($read_mode != Crud::BULK_READ && isset($obj->id))
			{
				trigger_error('Crud class receieved data including an ID in single read mode. Did you mean to use bulk read, or single read and update?', E_USER_WARNING);
			}
		}
		else if(preg_match('/^-?\d+$/', $id_or_fields))
			$id = (int)$id_or_fields;
		else
			throw new \Exception('Invalid ID');
		
		$this->id = $id;
		
		if($read_mode != Crud::BULK_READ){
			if($this->id == -1){
				$this->create();
			} else {
				if(!empty($this->id)){
					// Only attempt a read if not empty as this can lead to erroneous error being thrown
					$this->read(Marker::SINGLE_READ);
				}
			}
		} else {
			$arbitraryDataColumnName = $this->get_arbitrary_data_column_name();
			
			if(!empty($arbitraryDataColumnName) && !empty($this->fields[$arbitraryDataColumnName]))
				$this->parse_arbitrary_data($this->fields[$arbitraryDataColumnName]);
		}
		
		$this->onCrudInitialized();
	}
	
	protected function onCrudInitialized()
	{
		
	}
	
	private static function cacheColumnsByTableName($table_name)
	{
		global $wpdb;
		
		if(!isset(Crud::$cached_columns_by_table_name))
			Crud::$cached_columns_by_table_name = array();
		
		if(isset(Crud::$cached_columns_by_table_name[$table_name]))
			return;
		
		$columns = $wpdb->get_results("SHOW COLUMNS FROM $table_name");
		
		Crud::$cached_column_name_map_by_table_name[$table_name] = array();
		foreach($columns as $col)
		{
			Crud::$cached_column_name_map_by_table_name[$table_name][$col->Field] = $col;
		}
		
		Crud::$cached_columns_by_table_name[$table_name] = $columns;
	}
	
	public static function getColumnsByTableName($table_name)
	{
		Crud::cacheColumnsByTableName($table_name);
		
		return Crud::$cached_columns_by_table_name[$table_name];
	}
	
	public static function bulk_read($data, $constructor)
	{
		if(!is_array($data))
			throw new \Exception('Argument must be an array of objects');
		
		$result = array();
		
		foreach($data as $row)
			$result[] = new $constructor($row, Crud::BULK_READ);
		
		return $result;
	}
	
	public static function bulk_trash($ids)
	{
		global $wpdb;
		
		if(!is_array($ids))
			throw new \Exception('Arugment must be an array of integer IDs');
		
		if(empty($ids))
			return;
		
		$table_name = static::get_table_name_static();
		
		$count = count($ids);
		$placeholders = implode(',', array_fill(0, $count, '%d'));
		$stmt = $wpdb->prepare("DELETE FROM `{$table_name}` WHERE id IN ($placeholders)", $ids);
		$wpdb->query($stmt);
	}

	
	/**
	 * Gets the table name for this object type
	 * @return string
	 */
	public function get_table_name()
	{
		return $this->table_name;
	}
	
	/**
	 * Gets the column information (name, type, etc.)
	 * @return array
	 */
	public function get_columns()
	{
		return Crud::$cached_columns_by_table_name[$this->table_name];
	}
	
	/**
	 * Returns an array of the column names represented as strings
	 * @return array
	 */
	public function get_column_names()
	{
		return array_keys( Crud::$cached_column_name_map_by_table_name[$this->table_name] );
	}
	
	public function get_columns_by_name()
	{
		return Crud::$cached_column_name_map_by_table_name[$this->table_name];
	}
	
	/**
	 * Return the SQL field type of the specified column
	 * @return string
	 */
	public function get_column_type($name)
	{
		$columns = $this->get_columns();
		
		foreach($columns as $index => $column)
		{
			if($column->Field == $name)
				return $column->Type;
		}
		
		return Crud::$cached_columns_by_table_name[$this->table_name];
	}
	
	/**
	 * Gets the placeholder for a prepared statement based on the SQL column type specified.
	 * @param string $type The SQL data type
	 * @return string A placeholder, such as %s, %d or %f
	 */
	protected function get_placeholder_by_type($type)
	{
		$type = strtolower(preg_replace('/\(\d+\)$/', '', $type));
		
		switch($type)
		{
			case 'tinyint':
			case 'smallint':
			case 'mediumint':
			case 'int':
			case 'bigint':
			case 'bit':
			case 'boolean':
				$placeholder = '%d';
				break;
			
			case 'decimal':
			case 'float':
			case 'double':
			case 'real':
				$placeholder = '%f';
				break;
				
			default:
				$placeholder = '%s';
				break;
		}
		
		return $placeholder;
	}
	
	/**
	 * Gets the parameter to be passed to a prepared statement, from this object, by the name of the DB column given.
	 * @param string $name The database column name
	 * @return mixed The value of the specified field name from this object
	 */
	protected function get_column_parameter($name)
	{
		if(array_key_exists($name, $this->fields))
			return $this->fields[$name];
		
		return '';
	}
	
	/**
	 * Gets all the placeholders for a prepared statement
	 * @return array An array of string placeholders
	 */
	protected function get_column_placeholders()
	{
		$columns = $this->get_columns();
		$placeholders = array();
		
		foreach($columns as $index => $column)
		{
			if($column->Field == 'id')
				continue;
			
			$placeholders[] = $this->get_placeholder_by_type($column->Type);
		}
		
		return $placeholders;
	}
	
	/**
	 * Gets all the values to be passed to a prepared statement from this object
	 * @return array An array of the values from this object
	 */
	protected function get_column_parameters()
	{
		$columns = $this->get_columns();
		$params = array();
		
		foreach($columns as $index => $column)
		{
			if($column->Field == 'id')
				continue;
			
			$params[] = $this->get_column_parameter($column->Field);
		}
		
		return $params;
	}
	
	/**
	 * Gets the column name used to store arbitrary data, for instance, other_data, or NULL for tables which do not have such a field.
	 * @return string The name of the column used to store arbitrary data
	 */
	protected function get_arbitrary_data_column_name()
	{
		return null;
	}
	
	/**
	 * Asserts that this object hasn't been trashed and throws an exception if it has
	 * @throws \Exception
	 * @return void
	 */
	protected function assert_not_trashed()
	{
		if($this->trashed)
			throw new \Exception('Operation on trashed map object');
	}
	
	/**
	 * Returns true if the named column exists on this map objects table
	 * @return bool
	 */
	protected function column_exists($name)
	{
		return isset($cached_column_name_map_by_table_name[$this->table_name]);
	}
	
	/**
	 * Parses arbitrary data following a DB read, for example by unserializing strings or decoding JSON.
	 * @return void
	 */
	protected function parse_arbitrary_data($data)
	{
		if(!$this->get_arbitrary_data_column_name())
			throw new \Exception('No arbitrary data field on this table');
		
		$data = maybe_unserialize($data);
		
		if(!is_object($data) && !is_array($data))
			return;
		
		foreach($data as $key => $value)
			$this->fields[$key] = $value;
			
		$name = $this->get_arbitrary_data_column_name();
		unset($this->fields[$name]);
	}
	
	/**
	 * Stores arbitrary data. This is not currently used.
	 * @return void
	 */
	protected function store_arbitrary_data($key, $value)
	{
		if(!$this->get_arbitrary_data_column_name())
			throw new \Exception('No arbitrary data field on this table');
		
		
	}
	
	/**
	 * Creates the map object in the database
	 * @throws \Exception The object has been trashed
	 * @return void
	 */
	protected function create()
	{
		global $wpdb;
		
		$this->assert_not_trashed();
		
		// TODO: Support arbitrary data
		
		$column_names = array_flip( $this->get_column_names() );
		unset($column_names['id']);
		$column_names	= implode(',', array_keys($column_names));
		
		$placeholders	= implode(',', $this->get_column_placeholders());
		$parameters		= $this->get_column_parameters();
		
		$qstr = "INSERT INTO `{$this->table_name}` ($column_names) VALUES ($placeholders)";
		
		$stmt = $wpdb->prepare($qstr, $parameters);
		$wpdb->query($stmt);
		
		$this->id = $wpdb->insert_id;
	}
	
	protected function getReadColumns()
	{
		return array("*");
	}
	
	/**
	 * Reads the data from the database into this object
	 * @throws \Exception The object has been trashed
	 * @return void
	 */
	protected function read($mode)
	{
		global $wpdb;
		
		$this->assert_not_trashed();
		
		$columns = implode(', ', $this->getReadColumns());
		
		$stmt = $wpdb->prepare("SELECT $columns FROM " . $this->get_table_name() . " WHERE id = %d", array($this->id));
		
		$results = $wpdb->get_results($stmt);
		
		if(empty($results))
			throw new \Exception(get_called_class() . " ID '{$this->id}' not found");
		
		$this->fields = (array)$results[0];
		unset($this->fields['id']);
		
		$arbitrary_data_column_name = $this->get_arbitrary_data_column_name();
		
		if($arbitrary_data_column_name && isset($this->fields[$arbitrary_data_column_name]))
		{
			$this->parse_arbitrary_data($this->fields[$arbitrary_data_column_name]);
			unset($this->fields[$arbitrary_data_column_name]);
		}
	}
	
	/**
	 * Returns true if the specified property is read only
	 * @return bool Whether or not the property is read only
	 */
	protected function is_read_only($key)
	{
		switch($key)
		{
			case 'id':
			case 'table_name':
			case 'fields':
			case 'modified':
			case 'trashed':
				return true;
				break;
		}
		
		return false;
	}
	
	/**
	 * Updates the map object in the database
	 * @throws \Exception The object has been trashed
	 * @return $this
	 */
	public function update()
	{
		global $wpdb;
		
		$this->assert_not_trashed();
		
		$column_names = array_flip( $this->get_column_names() );
		unset($column_names['id']);
		$column_names = array_keys($column_names);
		
		$placeholders = $this->get_column_placeholders();
		$parameters	= $this->get_column_parameters();
		
		$assignments = array();
		for($i = 0; $i < count($column_names); $i++)
			$assignments[] = $column_names[$i] . '=' . $placeholders[$i];
		$assignments = implode(',', $assignments);
		
		$parameters[] = $this->id;
		
		$qstr = "UPDATE {$this->table_name} SET $assignments WHERE id=%d";
		$stmt = $wpdb->prepare($qstr, $parameters);
		$wpdb->query($stmt);

		// Arbitrary data
		$data = array();
			
		foreach($this->fields as $key => $value)
		{
			if(array_search($key, $column_names) !== false)
				continue;
			
			$data[$key] = $value;
		}
		
		$arbitrary_data_column_name = $this->get_arbitrary_data_column_name();
		
		if(!empty($data) && !$arbitrary_data_column_name)
			trigger_error('Arbitrary data cannot be stored on this column - the following fields will be lost: ' . implode(', ', array_keys($data)), E_USER_WARNING);
		else if($arbitrary_data_column_name)
		{
			$data = serialize($data);
			
			$stmt = $wpdb->prepare("UPDATE {$this->table_name} SET $arbitrary_data_column_name=%s WHERE id=%d", array($data, $this->id));
			
			$wpdb->query($stmt);
		}
		
		return $this;
	}
	
	/**
	 * Deletes the object from the database and sets the trashed flag
	 * @throws \Exception The object has been trashed
	 * @return void
	 */
	public function trash()
	{
		global $wpdb;
		
		$this->assert_not_trashed();
		
		$stmt = $wpdb->prepare("DELETE FROM {$this->table_name} WHERE id=%d", array($this->id));
		
		$wpdb->query($stmt);
		
		$this->trashed = true;
	}
	
	public function duplicate()
	{
		global $wpdb;
		
		$columns = array();
		
		foreach($wpdb->get_col("SHOW COLUMNS FROM `{$this->table_name}`") as $name)
		{
			if($name == 'id')
				continue;
			
			$columns []= $name;
		}
		
		$imploded = implode(',', $columns);
		
		$query = "INSERT INTO {$this->table_name} ($imploded) SELECT $imploded FROM {$this->table_name} WHERE id=%d";
		
		$stmt = $wpdb->prepare($query, $this->id);
		
		$wpdb->query($stmt);
		
		$class = get_class($this);
		
		return $class::createInstance($wpdb->insert_id);
	}
	
	/**
	 * Set variables in bulk, this reduces the number of database calls
	 * @param string|array|object Either a string naming the property to be set (with a second argument which is the value), or an array or object of key and value pairs to be set on this object
	 * @throws \Exception The object has been trashed
	 * @return $this
	 */
	public function set($arg, $val=null)
	{
		$this->assert_not_trashed();
		
		if(is_string($arg)){
			if(is_string($val)){
				$val = wp_kses_post($val);
			}
			$this->__set($arg, $val);
		} else if(is_array($arg) || is_object($arg)){
			foreach($arg as $key => $value){
				if($this->is_read_only($key)){
					throw new \Exception('Property is read only');
				}
				
				if(is_string($value)){
					$value = wp_kses_post($value);
				}

				if($key === 'link' || $key === 'title'){
					$value = html_entity_decode($value);
				}

				$this->fields[$key] = $value;
			}
			
			$this->update();
		} else{
			throw new \Exception('Invalid argument');
		}
		
		return $this;
	}
	
	/**
	 * Sets a variable on the object without writing to the database. Useful for overriding properties
	 */
	public function override($key, $value)
	{
		$this->assert_not_trashed();
		
		$this->overrides[$key] = $value;
		
		return $this;
	}
	
	/**
	 * Get's the iterator for iterating over map object properties
	 * @throws \Exception The object has been trashed
	 * @return \ArrayIterator
	 */
	#[\ReturnTypeWillChange]
	public function getIterator()
	{
		$this->assert_not_trashed();
		
		return new \ArrayIterator($this->fields);
	}
	
	/**
	 * Returns the objects properties to be serialized as JSON
	 * @throws \Exception
	 * @return array
	 */
	#[\ReturnTypeWillChange]
	public function jsonSerialize()
	{
		$this->assert_not_trashed();
		
		if(!is_array($this->fields))
			throw new \Exception("Field data is not an array");
		
		return array_merge($this->fields, array('id' => $this->id));
	}
	
	/**
	 * Magic method to get map object fields
	 * @params string $name The name of the property to read
	 * @throws \Exception The object has been trashed
	 * @return mixed
	 */
	public function __get($name)
	{
		$this->assert_not_trashed();
		
		if(isset($this->fields[$name]))
			return $this->fields[$name];
		
		switch($name)
		{
			case 'id':
			case 'modified':
			case 'custom_fields':
				return $this->{$name};
				break;
		}
		
		return null;
	}
	
	/**
	 * Checks if a field is set by name
	 * @params string $name The name of the property to check
	 * @throws \Exception The object has been trashed.
	 * @return boolean
	 */
	public function __isset($name)
	{
		$this->assert_not_trashed();
		
		if($name == 'id')
			return true;
		
		return isset($this->fields[$name]);
	}
	
	/**
	 * Sets the property value by name and updates the database
	 * @param string $name The property name
	 * @param mixed $value The value to set on the specified property
	 * @throws \Exception The object has been trashed
	 * @throws \Exception The specified property is read-only
	 * @return void
	 */
	public function __set($name, $value)
	{
		global $wpdb;
		
		$this->assert_not_trashed();
		
		if($this->is_read_only($name))
			throw new \Exception('Property is read only');
		
		if(is_string($value)){
			// $value = htmlspecialchars_decode(wp_kses_post($value));
			$value = wp_kses_post($value);
		}
		
		$this->fields[$name] = $value;
		
		$columns = $this->get_columns();
		
		// TODO: This loop could be replaced with a placeholder cache
		foreach($columns as $column)
		{
			if($column->Field != $name)
				continue;
			
			$placeholder = $this->get_placeholder_by_type($column->Type);
			$params = array($value, $this->id);
			
			$stmt = $wpdb->prepare("UPDATE {$this->table_name} SET $name = $placeholder WHERE id = %d", $params);
			$wpdb->query($stmt);
			
			return;
		}
		
		$arbitrary_data_column_name = $this->get_arbitrary_data_column_name();
		
		if(!$arbitrary_data_column_name)
			throw new \Exception('Cannot store arbitrary data on this table');
		
		$stmt = $wpdb->prepare("SELECT $arbitrary_data_column_name FROM {$this->table_name} WHERE id=%d", array($this->id));
		
		$raw = $wpdb->get_var($stmt);
		$data = maybe_unserialize($raw);
		
		if(empty($data))
			$data = array();
		
		$data[$name] = $value;
		
		$data = serialize($data);
		
		$stmt = $wpdb->prepare("UPDATE {$this->table_name} SET $arbitrary_data_column_name=%s WHERE id=%d", array($data, $this->id));
		
		$wpdb->query($stmt);
	}
	
	/**
	 * Unsets the named variable, only valid for arbitrary data
	 * @throws \Exception when attempting to unset a column, as opposed to arbitrary data.
	 * @return void
	 */
	public function __unset($name)
	{
		$column_names = $this->get_column_names();
		
		if(array_search($name, $column_names) !== false)
			throw new \Exception('Only arbitrary data can be unset. Columns must be set to NULL instead');
		
		unset($this->fields[$name]);
		
		$this->update();
	}
}

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