427 lines
13 KiB
PHP
Executable File
427 lines
13 KiB
PHP
Executable File
<?php
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/**
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* Paginator Component
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*
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* CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
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* Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
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*
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* Licensed under The MIT License
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* For full copyright and license information, please see the LICENSE.txt
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* Redistributions of files must retain the above copyright notice.
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*
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* @copyright Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
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* @link http://cakephp.org CakePHP(tm) Project
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* @package Cake.Controller.Component
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* @since CakePHP(tm) v 2.0
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* @license http://www.opensource.org/licenses/mit-license.php MIT License
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*/
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App::uses('Component', 'Controller');
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App::uses('Hash', 'Utility');
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/**
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* This component is used to handle automatic model data pagination. The primary way to use this
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* component is to call the paginate() method. There is a convenience wrapper on Controller as well.
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*
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* ### Configuring pagination
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*
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* You configure pagination using the PaginatorComponent::$settings. This allows you to configure
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* the default pagination behavior in general or for a specific model. General settings are used when there
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* are no specific model configuration, or the model you are paginating does not have specific settings.
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*
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* {{{
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* $this->Paginator->settings = array(
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* 'limit' => 20,
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* 'maxLimit' => 100
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* );
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* }}}
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*
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* The above settings will be used to paginate any model. You can configure model specific settings by
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* keying the settings with the model name.
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*
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* {{{
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* $this->Paginator->settings = array(
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* 'Post' => array(
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* 'limit' => 20,
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* 'maxLimit' => 100
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* ),
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* 'Comment' => array( ... )
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* );
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* }}}
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*
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* This would allow you to have different pagination settings for `Comment` and `Post` models.
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*
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* #### Paginating with custom finders
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*
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* You can paginate with any find type defined on your model using the `findType` option.
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*
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* {{{
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* $this->Paginator->settings = array(
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* 'Post' => array(
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* 'findType' => 'popular'
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* )
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* );
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* }}}
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*
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* Would paginate using the `find('popular')` method.
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*
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* @package Cake.Controller.Component
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* @link http://book.cakephp.org/2.0/en/core-libraries/components/pagination.html
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*/
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class PaginatorComponent extends Component {
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/**
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* Pagination settings. These settings control pagination at a general level.
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* You can also define sub arrays for pagination settings for specific models.
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*
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* - `maxLimit` The maximum limit users can choose to view. Defaults to 100
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* - `limit` The initial number of items per page. Defaults to 20.
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* - `page` The starting page, defaults to 1.
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* - `paramType` What type of parameters you want pagination to use?
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* - `named` Use named parameters / routed parameters.
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* - `querystring` Use query string parameters.
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*
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* @var array
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*/
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public $settings = array(
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'page' => 1,
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'limit' => 20,
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'maxLimit' => 100,
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'paramType' => 'named'
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);
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/**
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* A list of parameters users are allowed to set using request parameters. Modifying
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* this list will allow users to have more influence over pagination,
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* be careful with what you permit.
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*
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* @var array
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*/
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public $whitelist = array(
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'limit', 'sort', 'page', 'direction'
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);
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/**
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* Constructor
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*
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* @param ComponentCollection $collection A ComponentCollection this component can use to lazy load its components
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* @param array $settings Array of configuration settings.
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*/
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public function __construct(ComponentCollection $collection, $settings = array()) {
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$settings = array_merge($this->settings, (array)$settings);
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$this->Controller = $collection->getController();
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parent::__construct($collection, $settings);
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}
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/**
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* Handles automatic pagination of model records.
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*
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* @param Model|string $object Model to paginate (e.g: model instance, or 'Model', or 'Model.InnerModel')
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* @param string|array $scope Additional find conditions to use while paginating
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* @param array $whitelist List of allowed fields for ordering. This allows you to prevent ordering
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* on non-indexed, or undesirable columns. See PaginatorComponent::validateSort() for additional details
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* on how the whitelisting and sort field validation works.
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* @return array Model query results
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* @throws MissingModelException
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* @throws NotFoundException
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*/
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public function paginate($object = null, $scope = array(), $whitelist = array()) {
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if (is_array($object)) {
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$whitelist = $scope;
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$scope = $object;
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$object = null;
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}
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$object = $this->_getObject($object);
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if (!is_object($object)) {
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throw new MissingModelException($object);
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}
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$options = $this->mergeOptions($object->alias);
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$options = $this->validateSort($object, $options, $whitelist);
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$options = $this->checkLimit($options);
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$conditions = $fields = $order = $limit = $page = $recursive = null;
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if (!isset($options['conditions'])) {
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$options['conditions'] = array();
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}
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$type = 'all';
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if (isset($options[0])) {
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$type = $options[0];
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unset($options[0]);
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}
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extract($options);
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if (is_array($scope) && !empty($scope)) {
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$conditions = array_merge($conditions, $scope);
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} elseif (is_string($scope)) {
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$conditions = array($conditions, $scope);
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}
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if ($recursive === null) {
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$recursive = $object->recursive;
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}
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$extra = array_diff_key($options, compact(
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'conditions', 'fields', 'order', 'limit', 'page', 'recursive'
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));
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if (!empty($extra['findType'])) {
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$type = $extra['findType'];
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unset($extra['findType']);
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}
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if ($type !== 'all') {
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$extra['type'] = $type;
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}
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if (intval($page) < 1) {
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$page = 1;
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}
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$page = $options['page'] = (int)$page;
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if ($object->hasMethod('paginate')) {
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$results = $object->paginate(
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$conditions, $fields, $order, $limit, $page, $recursive, $extra
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);
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} else {
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$parameters = compact('conditions', 'fields', 'order', 'limit', 'page');
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if ($recursive != $object->recursive) {
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$parameters['recursive'] = $recursive;
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}
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$results = $object->find($type, array_merge($parameters, $extra));
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}
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$defaults = $this->getDefaults($object->alias);
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unset($defaults[0]);
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if (!$results) {
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$count = 0;
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} elseif ($object->hasMethod('paginateCount')) {
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$count = $object->paginateCount($conditions, $recursive, $extra);
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} else {
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$parameters = compact('conditions');
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if ($recursive != $object->recursive) {
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$parameters['recursive'] = $recursive;
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}
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$count = $object->find('count', array_merge($parameters, $extra));
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}
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$pageCount = intval(ceil($count / $limit));
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$requestedPage = $page;
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$page = max(min($page, $pageCount), 1);
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$paging = array(
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'page' => $page,
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'current' => count($results),
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'count' => $count,
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'prevPage' => ($page > 1),
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'nextPage' => ($count > ($page * $limit)),
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'pageCount' => $pageCount,
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'order' => $order,
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'limit' => $limit,
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'options' => Hash::diff($options, $defaults),
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'paramType' => $options['paramType']
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);
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if (!isset($this->Controller->request['paging'])) {
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$this->Controller->request['paging'] = array();
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}
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$this->Controller->request['paging'] = array_merge(
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(array)$this->Controller->request['paging'],
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array($object->alias => $paging)
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);
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if ($requestedPage > $page) {
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throw new NotFoundException();
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}
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if (
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!in_array('Paginator', $this->Controller->helpers) &&
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!array_key_exists('Paginator', $this->Controller->helpers)
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) {
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$this->Controller->helpers[] = 'Paginator';
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}
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return $results;
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}
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/**
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* Get the object pagination will occur on.
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*
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* @param string|Model $object The object you are looking for.
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* @return mixed The model object to paginate on.
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*/
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protected function _getObject($object) {
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if (is_string($object)) {
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$assoc = null;
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if (strpos($object, '.') !== false) {
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list($object, $assoc) = pluginSplit($object);
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}
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if ($assoc && isset($this->Controller->{$object}->{$assoc})) {
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return $this->Controller->{$object}->{$assoc};
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}
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if ($assoc && isset($this->Controller->{$this->Controller->modelClass}->{$assoc})) {
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return $this->Controller->{$this->Controller->modelClass}->{$assoc};
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}
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if (isset($this->Controller->{$object})) {
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return $this->Controller->{$object};
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}
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if (isset($this->Controller->{$this->Controller->modelClass}->{$object})) {
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return $this->Controller->{$this->Controller->modelClass}->{$object};
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}
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}
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if (empty($object) || $object === null) {
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if (isset($this->Controller->{$this->Controller->modelClass})) {
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return $this->Controller->{$this->Controller->modelClass};
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}
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$className = null;
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$name = $this->Controller->uses[0];
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if (strpos($this->Controller->uses[0], '.') !== false) {
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list($name, $className) = explode('.', $this->Controller->uses[0]);
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}
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if ($className) {
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return $this->Controller->{$className};
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}
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return $this->Controller->{$name};
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}
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return $object;
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}
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/**
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* Merges the various options that Pagination uses.
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* Pulls settings together from the following places:
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*
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* - General pagination settings
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* - Model specific settings.
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* - Request parameters
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*
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* The result of this method is the aggregate of all the option sets combined together. You can change
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* PaginatorComponent::$whitelist to modify which options/values can be set using request parameters.
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*
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* @param string $alias Model alias being paginated, if the general settings has a key with this value
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* that key's settings will be used for pagination instead of the general ones.
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* @return array Array of merged options.
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*/
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public function mergeOptions($alias) {
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$defaults = $this->getDefaults($alias);
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switch ($defaults['paramType']) {
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case 'named':
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$request = $this->Controller->request->params['named'];
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break;
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case 'querystring':
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$request = $this->Controller->request->query;
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break;
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}
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$request = array_intersect_key($request, array_flip($this->whitelist));
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return array_merge($defaults, $request);
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}
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/**
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* Get the default settings for a $model. If there are no settings for a specific model, the general settings
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* will be used.
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*
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* @param string $alias Model name to get default settings for.
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* @return array An array of pagination defaults for a model, or the general settings.
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*/
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public function getDefaults($alias) {
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$defaults = $this->settings;
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if (isset($this->settings[$alias])) {
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$defaults = $this->settings[$alias];
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}
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if (isset($defaults['limit']) &&
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(empty($defaults['maxLimit']) || $defaults['limit'] > $defaults['maxLimit'])
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) {
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$defaults['maxLimit'] = $defaults['limit'];
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}
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return array_merge(
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array('page' => 1, 'limit' => 20, 'maxLimit' => 100, 'paramType' => 'named'),
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$defaults
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);
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}
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/**
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* Validate that the desired sorting can be performed on the $object. Only fields or
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* virtualFields can be sorted on. The direction param will also be sanitized. Lastly
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* sort + direction keys will be converted into the model friendly order key.
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*
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* You can use the whitelist parameter to control which columns/fields are available for sorting.
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* This helps prevent users from ordering large result sets on un-indexed values.
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*
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* Any columns listed in the sort whitelist will be implicitly trusted. You can use this to sort
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* on synthetic columns, or columns added in custom find operations that may not exist in the schema.
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*
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* @param Model $object The model being paginated.
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* @param array $options The pagination options being used for this request.
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* @param array $whitelist The list of columns that can be used for sorting. If empty all keys are allowed.
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* @return array An array of options with sort + direction removed and replaced with order if possible.
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*/
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public function validateSort(Model $object, array $options, array $whitelist = array()) {
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if (empty($options['order']) && is_array($object->order)) {
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$options['order'] = $object->order;
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}
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if (isset($options['sort'])) {
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$direction = null;
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if (isset($options['direction'])) {
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$direction = strtolower($options['direction']);
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}
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if (!in_array($direction, array('asc', 'desc'))) {
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$direction = 'asc';
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}
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$options['order'] = array($options['sort'] => $direction);
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}
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if (!empty($whitelist) && isset($options['order']) && is_array($options['order'])) {
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$field = key($options['order']);
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$inWhitelist = in_array($field, $whitelist, true);
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if (!$inWhitelist) {
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$options['order'] = null;
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}
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return $options;
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}
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if (!empty($options['order']) && is_array($options['order'])) {
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$order = array();
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foreach ($options['order'] as $key => $value) {
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$field = $key;
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$alias = $object->alias;
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if (strpos($key, '.') !== false) {
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list($alias, $field) = explode('.', $key);
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}
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$correctAlias = ($object->alias == $alias);
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if ($correctAlias && $object->hasField($field)) {
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$order[$object->alias . '.' . $field] = $value;
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} elseif ($correctAlias && $object->hasField($key, true)) {
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$order[$field] = $value;
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} elseif (isset($object->{$alias}) && $object->{$alias}->hasField($field, true)) {
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$order[$alias . '.' . $field] = $value;
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}
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}
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$options['order'] = $order;
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}
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return $options;
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}
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/**
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* Check the limit parameter and ensure its within the maxLimit bounds.
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*
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* @param array $options An array of options with a limit key to be checked.
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* @return array An array of options for pagination
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*/
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public function checkLimit(array $options) {
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$options['limit'] = (int)$options['limit'];
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if (empty($options['limit']) || $options['limit'] < 1) {
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$options['limit'] = 1;
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}
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$options['limit'] = min($options['limit'], $options['maxLimit']);
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return $options;
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}
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}
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