1 | <?php |
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2 | |||
3 | namespace Elgg\Http; |
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4 | |||
5 | use Elgg\Ajax\Service as AjaxService; |
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6 | use Elgg\PluginHooksService; |
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7 | use ElggEntity; |
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8 | use InvalidArgumentException; |
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9 | use InvalidParameterException; |
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10 | use Symfony\Component\HttpFoundation\RedirectResponse as SymfonyRedirectResponse; |
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11 | use Symfony\Component\HttpFoundation\Response; |
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12 | use Symfony\Component\HttpFoundation\ResponseHeaderBag; |
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13 | |||
14 | /** |
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15 | * WARNING: API IN FLUX. DO NOT USE DIRECTLY. |
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16 | * |
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17 | * @since 2.3 |
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18 | * @access private |
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19 | */ |
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20 | class ResponseFactory { |
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21 | |||
22 | /** |
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23 | * @var Request |
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24 | */ |
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25 | private $request; |
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26 | |||
27 | /** |
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28 | * @var AjaxService |
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29 | */ |
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30 | private $ajax; |
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31 | |||
32 | /** |
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33 | * @var PluginHooksService |
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34 | */ |
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35 | private $hooks; |
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36 | |||
37 | /** |
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38 | * @var ResponseTransport |
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39 | */ |
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40 | private $transport; |
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41 | |||
42 | /** |
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43 | * @var Response|bool |
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44 | */ |
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45 | private $response_sent = false; |
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46 | |||
47 | /** |
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48 | * @var ResponseHeaderBag |
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49 | */ |
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50 | private $headers; |
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51 | |||
52 | /** |
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53 | * Constructor |
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54 | * |
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55 | * @param Request $request HTTP request |
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56 | * @param PluginHooksService $hooks Plugin hooks service |
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57 | * @param AjaxService $ajax AJAX service |
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58 | * @param ResponseTransport $transport Response transport |
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59 | */ |
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60 | 154 | public function __construct(Request $request, PluginHooksService $hooks, AjaxService $ajax, ResponseTransport $transport) { |
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61 | 154 | $this->request = $request; |
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62 | 154 | $this->hooks = $hooks; |
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63 | 154 | $this->ajax = $ajax; |
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64 | 154 | $this->transport = $transport; |
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65 | 154 | $this->headers = new ResponseHeaderBag(); |
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66 | 154 | } |
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67 | |||
68 | /** |
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69 | * Sets headers to apply to all responses being sent |
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70 | * |
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71 | * @param string $name Header name |
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72 | * @param string $value Header value |
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73 | * @param bool $replace Replace existing headers |
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74 | * @return void |
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75 | */ |
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76 | 27 | public function setHeader($name, $value, $replace = true) { |
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77 | 27 | $this->headers->set($name, $value, $replace); |
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78 | 27 | } |
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79 | |||
80 | /** |
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81 | * Get headers set to apply to all responses |
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82 | * |
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83 | * @param bool $remove_existing Remove existing headers found in headers_list() |
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84 | * @return ResponseHeaderBag |
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85 | */ |
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86 | 77 | public function getHeaders($remove_existing = true) { |
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87 | // Add headers that have already been set by underlying views |
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88 | // e.g. viewtype page shells set content-type headers |
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89 | 77 | $headers_list = headers_list(); |
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90 | 77 | foreach ($headers_list as $header) { |
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91 | if (stripos($header, 'HTTP/1.1') !== false) { |
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92 | continue; |
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93 | } |
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94 | |||
95 | list($name, $value) = explode(':', $header, 2); |
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96 | $this->setHeader($name, ltrim($value), false); |
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97 | if ($remove_existing) { |
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98 | header_remove($name); |
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99 | } |
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100 | } |
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101 | |||
102 | 77 | return $this->headers; |
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103 | } |
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104 | |||
105 | /** |
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106 | * Creates an HTTP response |
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107 | * |
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108 | * @param string $content The response content |
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109 | * @param integer $status The response status code |
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110 | * @param array $headers An array of response headers |
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111 | * @return Response |
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112 | */ |
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113 | 62 | public function prepareResponse($content = '', $status = 200, array $headers = []) { |
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114 | 62 | $header_bag = $this->getHeaders(); |
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115 | 62 | $header_bag->add($headers); |
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116 | 62 | $response = new Response($content, $status, $header_bag->all()); |
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117 | 62 | $response->prepare($this->request); |
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118 | 62 | return $response; |
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119 | } |
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120 | |||
121 | /** |
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122 | * Creates a redirect response |
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123 | * |
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124 | * @param string $url URL to redirect to |
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125 | * @param integer $status The status code (302 by default) |
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126 | * @param array $headers An array of response headers (Location is always set to the given URL) |
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127 | * @return SymfonyRedirectResponse |
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128 | * @throws InvalidArgumentException |
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129 | */ |
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130 | 14 | public function prepareRedirectResponse($url, $status = 302, array $headers = []) { |
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131 | 14 | $header_bag = $this->getHeaders(); |
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132 | 14 | $header_bag->add($headers); |
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133 | 14 | $response = new SymfonyRedirectResponse($url, $status, $header_bag->all()); |
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134 | 13 | $response->prepare($this->request); |
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135 | 13 | return $response; |
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136 | } |
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137 | |||
138 | /** |
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139 | * Send a response |
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140 | * |
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141 | * @param Response $response Response object |
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142 | * @return Response|false |
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143 | */ |
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144 | 102 | public function send(Response $response) { |
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145 | |||
146 | 102 | if ($this->response_sent) { |
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147 | 35 | if ($this->response_sent !== $response) { |
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148 | 4 | _elgg_services()->logger->error('Unable to send the following response: ' . PHP_EOL |
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149 | 4 | . (string) $response . PHP_EOL |
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150 | 4 | . 'because another response has already been sent: ' . PHP_EOL |
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151 | 35 | . (string) $this->response_sent); |
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152 | } |
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153 | } else { |
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154 | 102 | if (!elgg_trigger_before_event('send', 'http_response', $response)) { |
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155 | return false; |
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156 | } |
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157 | |||
158 | 102 | $request = $this->request; |
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159 | 102 | $method = $request->getRealMethod() ? : 'GET'; |
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160 | 102 | $path = $request->getElggPath(); |
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161 | |||
162 | 102 | _elgg_services()->logger->notice("Responding to {$method} {$path}"); |
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163 | 102 | if (!$this->transport->send($response)) { |
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164 | return false; |
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165 | } |
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166 | |||
167 | 102 | elgg_trigger_after_event('send', 'http_response', $response); |
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168 | 102 | $this->response_sent = $response; |
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169 | } |
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170 | |||
171 | 102 | return $this->response_sent; |
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172 | } |
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173 | |||
174 | /** |
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175 | * Returns a response that was sent to the client |
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176 | * |
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177 | * @return Response|false |
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178 | */ |
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179 | 95 | public function getSentResponse() { |
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180 | 95 | return $this->response_sent; |
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181 | } |
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182 | |||
183 | /** |
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184 | * Send HTTP response |
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185 | * |
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186 | * @param ResponseBuilder $response ResponseBuilder instance |
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187 | * An instance of an ErrorResponse, OkResponse or RedirectResponse |
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188 | * @return Response |
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189 | * @throws \InvalidParameterException |
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190 | */ |
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191 | 88 | public function respond(ResponseBuilder $response) { |
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192 | |||
193 | 88 | $response_type = $this->parseContext(); |
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194 | 88 | $response = $this->hooks->trigger('response', $response_type, $response, $response); |
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195 | 88 | if (!$response instanceof ResponseBuilder) { |
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196 | throw new InvalidParameterException("Handlers for 'response','$response_type' plugin hook must " |
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197 | . "return an instanceof " . ResponseBuilder::class); |
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198 | } |
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199 | |||
200 | 88 | if ($response->isNotModified()) { |
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201 | return $this->send($this->prepareResponse('', ELGG_HTTP_NOT_MODIFIED)); |
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202 | } |
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203 | |||
204 | 88 | $is_xhr = $this->request->isXmlHttpRequest(); |
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205 | |||
206 | 88 | $is_action = false; |
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207 | 88 | if (0 === strpos($response_type, 'action:')) { |
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208 | 22 | $is_action = true; |
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209 | } |
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210 | |||
211 | 88 | if ($is_action && $response->getForwardURL() === null) { |
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212 | // actions must always set a redirect url |
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213 | $response->setForwardURL(REFERRER); |
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214 | } |
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215 | |||
216 | 88 | if ($response->getForwardURL() === REFERRER) { |
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217 | 16 | $response->setForwardURL($this->request->headers->get('Referer')); |
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218 | } |
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219 | |||
220 | 88 | if ($response->getForwardURL() !== null && !$is_xhr) { |
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221 | // non-xhr requests should issue a forward if redirect url is set |
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222 | // unless it's an error, in which case we serve an error page |
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223 | 11 | if ($this->isAction() || (!$response->isClientError() && !$response->isServerError())) { |
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224 | 7 | $response->setStatusCode(ELGG_HTTP_FOUND); |
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225 | } |
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226 | } |
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227 | |||
228 | 88 | if ($is_xhr && $is_action && !$this->ajax->isAjax2Request()) { |
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229 | // xhr actions using legacy ajax API should return 200 with wrapped data |
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230 | 6 | $response->setStatusCode(ELGG_HTTP_OK); |
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231 | 6 | $response->setContent($this->wrapLegacyAjaxResponse($response->getContent(), $response->getForwardURL())); |
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232 | } |
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233 | |||
234 | 88 | if ($is_xhr && $is_action) { |
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235 | // Actions always respond with JSON on xhr calls |
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236 | 17 | $headers = $response->getHeaders(); |
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237 | 17 | $headers['Content-Type'] = 'application/json; charset=UTF-8'; |
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238 | 17 | $response->setHeaders($headers); |
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239 | } |
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240 | |||
241 | 88 | $content = $this->stringify($response->getContent()); |
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242 | 88 | $status_code = $response->getStatusCode(); |
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243 | 88 | $headers = $response->getHeaders(); |
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244 | |||
245 | 88 | if ($response->isRedirection()) { |
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246 | 10 | $redirect_url = $response->getForwardURL(); |
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247 | 10 | return $this->redirect($redirect_url, $status_code); |
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248 | } |
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249 | |||
250 | 81 | if ($this->ajax->isReady() && $response->isSuccessful()) { |
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251 | 20 | return $this->respondFromContent($content, $status_code, $headers); |
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252 | } |
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253 | |||
254 | 61 | if ($response->isClientError() || $response->isServerError() || $response instanceof ErrorResponse) { |
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255 | 16 | return $this->respondWithError($content, $status_code, $headers); |
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256 | } |
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257 | |||
258 | 45 | return $this->respondFromContent($content, $status_code, $headers); |
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259 | } |
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260 | |||
261 | /** |
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262 | * Send error HTTP response |
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263 | * |
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264 | * @param string $error Error message |
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265 | * @param int $status_code HTTP status code |
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266 | * @param array $headers HTTP headers (will be discarded on AJAX requests) |
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267 | * @return Response |
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268 | * @throws \InvalidParameterException |
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269 | */ |
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270 | 16 | public function respondWithError($error, $status_code = ELGG_HTTP_BAD_REQUEST, array $headers = []) { |
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271 | 16 | if ($this->ajax->isReady()) { |
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272 | 7 | return $this->send($this->ajax->respondWithError($error, $status_code)); |
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273 | } |
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274 | |||
275 | 9 | if ($this->isXhr()) { |
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276 | // xhr calls to non-actions (e.g. ajax/view or ajax/form) need to receive proper HTTP status code |
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277 | 5 | return $this->send($this->prepareResponse($error, $status_code, $headers)); |
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278 | } |
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279 | |||
280 | 4 | $forward_url = $this->request->headers->get('Referer'); |
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281 | |||
282 | 4 | if (!$this->isAction()) { |
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283 | $params = [ |
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284 | 4 | 'current_url' => current_page_url(), |
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285 | 4 | 'forward_url' => $forward_url, |
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286 | ]; |
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287 | // For BC, let plugins serve their own error page |
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288 | // @see elgg_error_page_handler |
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289 | 4 | $forward_reason = (string) $status_code; |
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290 | |||
291 | 4 | $forward_url = $this->hooks->trigger('forward', $forward_reason, $params, $forward_url); |
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292 | |||
293 | 4 | if ($this->response_sent) { |
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294 | // Response was sent from a forward hook |
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295 | return $this->response_sent; |
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296 | } |
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297 | |||
298 | 4 | $params['type'] = $forward_reason; |
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299 | 4 | $params['params']['error'] = $error; |
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300 | 4 | $error_page = elgg_view_resource('error', $params); |
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301 | 4 | return $this->send($this->prepareResponse($error_page, $status_code)); |
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302 | } |
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303 | |||
304 | $forward_url = elgg_normalize_url($forward_url); |
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305 | return $this->send($this->prepareRedirectResponse($forward_url)); |
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306 | } |
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307 | |||
308 | /** |
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309 | * Send OK response |
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310 | * |
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311 | * @param string $content Response body |
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312 | * @param int $status_code HTTP status code |
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313 | * @param array $headers HTTP headers (will be discarded for AJAX requests) |
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314 | * |
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315 | * @return Response|false |
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316 | */ |
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317 | 65 | public function respondFromContent($content = '', $status_code = ELGG_HTTP_OK, array $headers = []) { |
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318 | |||
319 | 65 | if ($this->ajax->isReady()) { |
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320 | 20 | $hook_type = $this->parseContext(); |
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321 | // $this->ajax->setStatusCode($status_code); |
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322 | 20 | return $this->send($this->ajax->respondFromOutput($content, $hook_type)); |
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323 | } |
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324 | |||
325 | 45 | return $this->send($this->prepareResponse($content, $status_code, $headers)); |
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326 | } |
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327 | |||
328 | /** |
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329 | * Wraps content for compability with legacy Elgg ajax calls |
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330 | * |
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331 | * @param string $content Response content |
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332 | * @param string $forward_url Forward URL |
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333 | * @return string |
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334 | */ |
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335 | 11 | public function wrapLegacyAjaxResponse($content = '', $forward_url = REFERRER) { |
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336 | |||
337 | 11 | $content = $this->stringify($content); |
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338 | |||
339 | 11 | if ($forward_url === REFERRER) { |
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340 | $forward_url = $this->request->headers->get('Referer'); |
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341 | } |
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342 | |||
343 | // always pass the full structure to avoid boilerplate JS code. |
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344 | $params = [ |
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345 | 11 | 'output' => '', |
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346 | 11 | 'status' => 0, |
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347 | 'system_messages' => [ |
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348 | 'error' => [], |
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349 | 'success' => [] |
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350 | ], |
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351 | 11 | 'current_url' => current_page_url(), |
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352 | 11 | 'forward_url' => elgg_normalize_url($forward_url), |
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353 | ]; |
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354 | |||
355 | 11 | $params['output'] = $this->ajax->decodeJson($content); |
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356 | |||
357 | // Grab any system messages so we can inject them via ajax too |
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358 | 11 | $system_messages = _elgg_services()->systemMessages->dumpRegister(); |
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359 | |||
360 | 11 | if (isset($system_messages['success'])) { |
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361 | 2 | $params['system_messages']['success'] = $system_messages['success']; |
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362 | } |
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363 | |||
364 | 11 | if (isset($system_messages['error'])) { |
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365 | 3 | $params['system_messages']['error'] = $system_messages['error']; |
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366 | 3 | $params['status'] = -1; |
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367 | } |
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368 | |||
369 | 11 | $response_type = $this->parseContext(); |
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370 | 11 | list($service, $name) = explode(':', $response_type); |
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371 | $context = [ |
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372 | 11 | $service => $name, |
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373 | ]; |
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374 | 11 | $params = $this->hooks->trigger('output', 'ajax', $context, $params); |
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375 | |||
376 | 11 | return $this->stringify($params); |
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377 | } |
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378 | |||
379 | /** |
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380 | * Prepares a redirect response |
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381 | * |
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382 | * @param string $forward_url Redirection URL |
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383 | * @param mixed $status_code HTTP status code or forward reason |
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384 | * @return SymfonyRedirectResponse |
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385 | * @throws InvalidParameterException |
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386 | */ |
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387 | 26 | public function redirect($forward_url = REFERRER, $status_code = ELGG_HTTP_FOUND) { |
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388 | |||
389 | 26 | if ($forward_url === REFERRER) { |
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390 | 5 | $forward_url = $this->request->headers->get('Referer'); |
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391 | } |
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392 | |||
393 | 26 | $forward_url = elgg_normalize_url($forward_url); |
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394 | |||
395 | // allow plugins to rewrite redirection URL |
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396 | 26 | $current_page = current_page_url(); |
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397 | $params = [ |
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398 | 26 | 'current_url' => $current_page, |
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399 | 26 | 'forward_url' => $forward_url |
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400 | ]; |
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401 | |||
402 | 26 | $forward_reason = (string) $status_code; |
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403 | |||
404 | 26 | $forward_url = $this->hooks->trigger('forward', $forward_reason, $params, $forward_url); |
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405 | |||
406 | 26 | if ($this->response_sent) { |
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407 | // Response was sent from a forward hook |
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408 | // Clearing handlers to void infinite loops |
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409 | 1 | return $this->response_sent; |
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410 | } |
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411 | |||
412 | 26 | if ($forward_url === REFERRER) { |
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413 | $forward_url = $this->request->headers->get('Referer'); |
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414 | } |
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415 | |||
416 | 26 | if (!is_string($forward_url)) { |
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417 | throw new InvalidParameterException("'forward', '$forward_reason' hook must return a valid redirection URL"); |
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418 | } |
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419 | |||
420 | 26 | $forward_url = elgg_normalize_url($forward_url); |
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421 | |||
422 | 26 | switch ($status_code) { |
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423 | 24 | case 'system': |
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424 | 24 | case 'csrf': |
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425 | 2 | $status_code = ELGG_HTTP_OK; |
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426 | 2 | break; |
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427 | 24 | case 'admin': |
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428 | 24 | case 'login': |
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429 | 24 | case 'member': |
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430 | 24 | case 'walled_garden': |
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431 | default : |
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432 | 25 | $status_code = (int) $status_code; |
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433 | 25 | if (!$status_code || $status_code < 100 || $status_code > 599) { |
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434 | 1 | $status_code = ELGG_HTTP_SEE_OTHER; |
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435 | } |
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436 | 25 | break; |
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437 | } |
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438 | |||
439 | 26 | if ($this->isXhr()) { |
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440 | 12 | if ($status_code < 100 || ($status_code >= 300 && $status_code <= 399) || $status_code > 599) { |
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441 | // We only want to preserve OK and error codes |
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442 | // Redirect responses should be converted to OK responses as this is an XHR request |
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443 | 9 | $status_code = ELGG_HTTP_OK; |
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444 | } |
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445 | 12 | $output = ob_get_clean(); |
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446 | 12 | if (!$this->isAction() && !$this->ajax->isAjax2Request()) { |
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447 | // legacy ajax calls are always OK |
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448 | // actions are wrapped by ResponseFactory::respond() |
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449 | 5 | $status_code = ELGG_HTTP_OK; |
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450 | 5 | $output = $this->wrapLegacyAjaxResponse($output, $forward_url); |
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451 | } |
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452 | |||
453 | 12 | $response = new OkResponse($output, $status_code, $forward_url); |
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454 | 12 | $headers = $response->getHeaders(); |
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455 | 12 | $headers['Content-Type'] = 'application/json; charset=UTF-8'; |
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456 | 12 | $response->setHeaders($headers); |
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457 | 12 | return $this->respond($response); |
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458 | } |
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459 | |||
460 | 14 | if ($this->isAction()) { |
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461 | // actions should always redirect on non xhr-calls |
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462 | 7 | if (!is_int($status_code) || $status_code < 300 || $status_code > 399) { |
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463 | 1 | $status_code = ELGG_HTTP_SEE_OTHER; |
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464 | } |
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465 | } |
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466 | |||
467 | 14 | $response = new OkResponse('', $status_code, $forward_url); |
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468 | 14 | if ($response->isRedirection()) { |
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469 | 12 | return $this->send($this->prepareRedirectResponse($forward_url, $status_code)); |
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470 | } |
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471 | 3 | return $this->respond($response); |
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472 | } |
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473 | |||
474 | /** |
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475 | * Parses response type to be used as plugin hook type |
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476 | * @return string |
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477 | */ |
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478 | 102 | public function parseContext() { |
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479 | |||
480 | 102 | $segments = $this->request->getUrlSegments(); |
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481 | |||
482 | 102 | $identifier = array_shift($segments); |
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483 | 102 | switch ($identifier) { |
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484 | 22 | case 'ajax' : |
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485 | 21 | $page = array_shift($segments); |
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486 | 21 | if ($page === 'view') { |
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487 | 14 | $view = implode('/', $segments); |
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488 | 14 | return "view:$view"; |
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489 | 7 | } else if ($page === 'form') { |
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490 | 5 | $form = implode('/', $segments); |
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491 | 5 | return "form:$form"; |
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492 | } |
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493 | 2 | array_unshift($segments, $page); |
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494 | 2 | break; |
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495 | |||
496 | 22 | case 'action' : |
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497 | 27 | $action = implode('/', $segments); |
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498 | 27 | return "action:$action"; |
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499 | } |
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500 | |||
501 | 57 | array_unshift($segments, $identifier); |
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502 | 57 | $path = implode('/', $segments); |
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503 | 57 | return "path:$path"; |
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504 | } |
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505 | |||
506 | /** |
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507 | * Check if the request is an XmlHttpRequest |
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508 | * @return bool |
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509 | */ |
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510 | 35 | public function isXhr() { |
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511 | 35 | return $this->request->isXmlHttpRequest(); |
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512 | } |
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513 | |||
514 | /** |
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515 | * Check if the requested path is an action |
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516 | * @return bool |
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517 | */ |
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518 | 29 | public function isAction() { |
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519 | 29 | if (0 === strpos($this->parseContext(), 'action:')) { |
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520 | 11 | return true; |
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521 | } |
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522 | 19 | return false; |
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523 | } |
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524 | |||
525 | /** |
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526 | * Normalizes content into serializable data by walking through arrays |
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527 | * and objectifying Elgg entities |
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528 | * |
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529 | * @param mixed $content Data to normalize |
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530 | * @return mixed |
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531 | */ |
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532 | 88 | public function normalize($content = '') { |
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533 | 88 | if ($content instanceof ElggEntity) { |
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534 | $content = (array) $content->toObject(); |
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535 | } |
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536 | 88 | if (is_array($content)) { |
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537 | 14 | foreach ($content as $key => $value) { |
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538 | 14 | $content[$key] = $this->normalize($value); |
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539 | } |
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540 | } |
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541 | 88 | return $content; |
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542 | } |
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543 | |||
544 | /** |
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545 | * Stringify/serialize response data |
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546 | * |
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547 | * Casts objects implementing __toString method to strings |
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548 | * Serializes non-scalar values to JSON |
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549 | * |
||
550 | * @param mixed $content Content to serialize |
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551 | * @return string |
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552 | */ |
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553 | 88 | public function stringify($content = '') { |
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554 | 88 | $content = $this->normalize($content); |
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555 | 88 | if (empty($content) || (is_object($content) && is_callable($content, '__toString'))) { |
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556 | 36 | return (string) $content; |
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557 | } |
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558 | 57 | if (is_scalar($content)) { |
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559 | 54 | return $content; |
|
560 | } |
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561 | 14 | return json_encode($content, ELGG_JSON_ENCODING); |
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562 | } |
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563 | |||
564 | /** |
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565 | * Replaces response transport |
||
566 | * |
||
567 | * @param ResponseTransport $transport Transport interface |
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568 | * @return void |
||
569 | */ |
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570 | public function setTransport(ResponseTransport $transport) { |
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571 | $this->transport = $transport; |
||
572 | } |
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573 | } |
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574 |