pictcode_admin / lib / Cake / View / JsonView.php @ 5ad38a95
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1 | 5ad38a95 | 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 | } |