pictcode / lib / Cake / View / JsonView.php @ 995bd018
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| 1 | 635eef61 | spyder1211 | <?php
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| 2 | /**
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| 3 |  * CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
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| 4 |  * Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
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| 5 |  *
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| 6 |  * Licensed under The MIT License
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| 7 |  * For full copyright and license information, please see the LICENSE.txt
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| 8 |  * Redistributions of files must retain the above copyright notice.
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| 9 |  *
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| 10 |  * @copyright     Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
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| 11 |  * @link          http://cakephp.org CakePHP(tm) Project
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| 12 |  * @license       http://www.opensource.org/licenses/mit-license.php MIT License
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| 13 |  */
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| 14 | |||
| 15 | App::uses('View', 'View');  | 
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| 16 | |||
| 17 | /**
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| 18 |  * A view class that is used for JSON responses.
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| 19 |  *
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| 20 |  * By setting the '_serialize' key in your controller, you can specify a view variable
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| 21 |  * that should be serialized to JSON and used as the response for the request.
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| 22 |  * This allows you to omit views and layouts if you just need to emit a single view
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| 23 |  * variable as the JSON response.
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| 24 |  *
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| 25 |  * In your controller, you could do the following:
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| 26 |  *
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| 27 |  * `$this->set(array('posts' => $posts, '_serialize' => 'posts'));`
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| 28 |  *
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| 29 |  * When the view is rendered, the `$posts` view variable will be serialized
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| 30 |  * into JSON.
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| 31 |  *
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| 32 |  * You can also define `'_serialize'` as an array. This will create a top level object containing
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| 33 |  * all the named view variables:
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| 34 |  *
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| 35 |  * ```
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| 36 |  * $this->set(compact('posts', 'users', 'stuff'));
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| 37 |  * $this->set('_serialize', array('posts', 'users'));
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| 38 |  * ```
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| 39 |  *
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| 40 |  * The above would generate a JSON object that looks like:
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| 41 |  *
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| 42 |  * `{"posts": [...], "users": [...]}`
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| 43 |  *
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| 44 |  * If you don't use the `_serialize` key, you will need a view. You can use extended
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| 45 |  * views to provide layout-like functionality.
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| 46 |  *
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| 47 |  * You can also enable JSONP support by setting parameter `_jsonp` to true or a string to specify
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| 48 |  * custom query string paramater name which will contain the callback function name.
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| 49 |  *
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| 50 |  * @package       Cake.View
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| 51 |  * @since         CakePHP(tm) v 2.1.0
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| 52 |  */
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| 53 | class JsonView extends View {  | 
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| 54 | |||
| 55 | /**
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| 56 |  * JSON views are always located in the 'json' sub directory for
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| 57 |  * controllers' views.
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| 58 |  *
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| 59 |  * @var string
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| 60 |  */
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| 61 | public $subDir = 'json';  | 
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| 62 | |||
| 63 | /**
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| 64 |  * Constructor
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| 65 |  *
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| 66 |  * @param Controller $controller Controller instance.
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| 67 |  */
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| 68 | public function __construct(Controller $controller = null) {  | 
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| 69 | parent::__construct($controller);  | 
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| 70 | if (isset($controller->response) && $controller->response instanceof CakeResponse) {  | 
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| 71 | $controller->response->type('json');  | 
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| 72 | }  | 
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| 73 | }  | 
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| 74 | |||
| 75 | /**
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| 76 |  * Skip loading helpers if this is a _serialize based view.
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| 77 |  *
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| 78 |  * @return void
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| 79 |  */
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| 80 | public function loadHelpers() {  | 
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| 81 | if (isset($this->viewVars['_serialize'])) {  | 
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| 82 |                         return;
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| 83 | }  | 
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| 84 |                 parent::loadHelpers();
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| 85 | }  | 
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| 86 | |||
| 87 | /**
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| 88 |  * Render a JSON view.
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| 89 |  *
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| 90 |  * ### Special parameters
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| 91 |  * `_serialize` To convert a set of view variables into a JSON response.
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| 92 |  *   Its value can be a string for single variable name or array for multiple names.
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| 93 |  *   You can omit the`_serialize` parameter, and use a normal view + layout as well.
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| 94 |  * `_jsonp` Enables JSONP support and wraps response in callback function provided in query string.
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| 95 |  *   - Setting it to true enables the default query string parameter "callback".
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| 96 |  *   - Setting it to a string value, uses the provided query string parameter for finding the
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| 97 |  *     JSONP callback name.
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| 98 |  *
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| 99 |  * @param string $view The view being rendered.
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| 100 |  * @param string $layout The layout being rendered.
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| 101 |  * @return string The rendered view.
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| 102 |  */
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| 103 | public function render($view = null, $layout = null) {  | 
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| 104 | $return = null;  | 
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| 105 | if (isset($this->viewVars['_serialize'])) {  | 
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| 106 | $return = $this->_serialize($this->viewVars['_serialize']);  | 
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| 107 | } elseif ($view !== false && $this->_getViewFileName($view)) {  | 
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| 108 | $return = parent::render($view, false);  | 
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| 109 | }  | 
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| 110 | |||
| 111 | if (!empty($this->viewVars['_jsonp'])) {  | 
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| 112 | $jsonpParam = $this->viewVars['_jsonp'];  | 
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| 113 | if ($this->viewVars['_jsonp'] === true) {  | 
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| 114 | $jsonpParam = 'callback';  | 
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| 115 | }  | 
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| 116 | if (isset($this->request->query[$jsonpParam])) {  | 
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| 117 | $return = sprintf('%s(%s)', h($this->request->query[$jsonpParam]), $return);  | 
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| 118 | $this->response->type('js');  | 
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| 119 | }  | 
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| 120 | }  | 
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| 121 | |||
| 122 | return $return;  | 
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| 123 | }  | 
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| 124 | |||
| 125 | /**
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| 126 |  * Serialize view vars
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| 127 |  *
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| 128 |  * ### Special parameters
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| 129 |  * `_jsonOptions` You can set custom options for json_encode() this way,
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| 130 |  *   e.g. `JSON_HEX_TAG | JSON_HEX_APOS`.
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| 131 |  *
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| 132 |  * @param array $serialize The viewVars that need to be serialized
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| 133 |  * @throws CakeException
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| 134 |  * @return string The serialized data
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| 135 |  */
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| 136 | protected function _serialize($serialize) {  | 
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| 137 | if (is_array($serialize)) {  | 
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| 138 | $data = array();  | 
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| 139 | foreach ($serialize as $alias => $key) {  | 
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| 140 | if (is_numeric($alias)) {  | 
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| 141 | $alias = $key;  | 
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| 142 | }  | 
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| 143 | if (array_key_exists($key, $this->viewVars)) {  | 
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| 144 | $data[$alias] = $this->viewVars[$key];  | 
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| 145 | }  | 
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| 146 | }  | 
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| 147 | $data = !empty($data) ? $data : null;  | 
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| 148 |                 } else {
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| 149 | $data = isset($this->viewVars[$serialize]) ? $this->viewVars[$serialize] : null;  | 
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| 150 | }  | 
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| 151 | |||
| 152 | $jsonOptions = 0;  | 
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| 153 | if (isset($this->viewVars['_jsonOptions'])) {  | 
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| 154 | if ($this->viewVars['_jsonOptions'] === false) {  | 
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| 155 | $jsonOptions = 0;  | 
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| 156 |                         } else {
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| 157 | $jsonOptions = $this->viewVars['_jsonOptions'];  | 
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| 158 | }  | 
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| 159 | }  | 
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| 160 | if (version_compare(PHP_VERSION, '5.4.0', '>=') && Configure::read('debug')) {  | 
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| 161 | $jsonOptions = $jsonOptions | JSON_PRETTY_PRINT;  | 
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| 162 | }  | 
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| 163 | |||
| 164 | $json = json_encode($data, $jsonOptions);  | 
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| 165 | |||
| 166 | if (function_exists('json_last_error') && json_last_error() !== JSON_ERROR_NONE) {  | 
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| 167 | throw new CakeException(json_last_error_msg());  | 
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| 168 | }  | 
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| 169 | if ($json === false) {  | 
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| 170 | throw new CakeException('Failed to parse JSON');  | 
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| 171 | }  | 
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| 172 | return $json;  | 
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| 173 | }  | 
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| 174 | |||
| 175 | }  |