Complex classes like ServerRequest often do a lot of different things. To break such a class down, we need to identify a cohesive component within that class. A common approach to find such a component is to look for fields/methods that share the same prefixes, or suffixes. You can also have a look at the cohesion graph to spot any un-connected, or weakly-connected components.
Once you have determined the fields that belong together, you can apply the Extract Class refactoring. If the component makes sense as a sub-class, Extract Subclass is also a candidate, and is often faster.
While breaking up the class, it is a good idea to analyze how other classes use ServerRequest, and based on these observations, apply Extract Interface, too.
1 | <?php |
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12 | class ServerRequest implements ServerRequestInterface |
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13 | { |
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14 | /** |
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15 | * @var string Represent the HTTP version number (e.g., "1.1", "1.0") |
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16 | */ |
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17 | private $version; |
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18 | |||
19 | /** |
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20 | * @var array Contains header by key and array. |
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21 | * e.g. ['content-type' => ['application/json']] |
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22 | */ |
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23 | private $headers; |
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24 | |||
25 | /** @var StreamInterface */ |
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26 | private $body; |
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27 | |||
28 | /** @var string */ |
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29 | private $requestTarget; |
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30 | |||
31 | /** @var string */ |
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32 | private $method; |
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33 | |||
34 | public function __construct( |
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51 | |||
52 | /** |
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53 | * Retrieves the HTTP protocol version as a string. |
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54 | * |
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55 | * The string MUST contain only the HTTP version number (e.g., "1.1", "1.0"). |
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56 | * |
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57 | * @return string HTTP protocol version. |
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58 | */ |
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59 | public function getProtocolVersion() |
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63 | |||
64 | /** |
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65 | * Return an instance with the specified HTTP protocol version. |
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66 | * |
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67 | * The version string MUST contain only the HTTP version number (e.g., |
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68 | * "1.1", "1.0"). |
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69 | * |
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70 | * This method MUST be implemented in such a way as to retain the |
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71 | * immutability of the message, and MUST return an instance that has the |
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72 | * new protocol version. |
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73 | * |
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74 | * @param string $version HTTP protocol version |
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75 | * @return static |
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76 | */ |
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77 | public function withProtocolVersion($version) : self |
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87 | |||
88 | /** |
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89 | * Verifies the protocol version. |
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90 | * |
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91 | * @throws InvalidArgumentException |
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92 | * @param string $version The version string MUST contain only the HTTP |
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93 | * version number (e.g., "1.1", "1.0"). |
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94 | */ |
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95 | private function validateProtocolVersion(string $version) : void |
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101 | |||
102 | /** |
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103 | * Retrieves all message header values. |
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104 | * |
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105 | * The keys represent the header name as it will be sent over the wire, and |
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106 | * each value is an array of strings associated with the header. |
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107 | * |
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108 | * // Represent the headers as a string |
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109 | * foreach ($message->getHeaders() as $name => $values) { |
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110 | * echo $name . ": " . implode(", ", $values); |
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111 | * } |
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112 | * |
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113 | * // Emit headers iteratively: |
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114 | * foreach ($message->getHeaders() as $name => $values) { |
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115 | * foreach ($values as $value) { |
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116 | * header(sprintf('%s: %s', $name, $value), false); |
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117 | * } |
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118 | * } |
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119 | * |
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120 | * While header names are not case-sensitive, getHeaders() will preserve the |
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121 | * exact case in which headers were originally specified. |
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122 | * |
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123 | * @return string[][] Returns an associative array of the message's headers. Each |
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124 | * key MUST be a header name, and each value MUST be an array of strings |
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125 | * for that header. |
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126 | */ |
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127 | public function getHeaders() |
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131 | |||
132 | /** |
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133 | * Checks if a header exists by the given case-insensitive name. |
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134 | * |
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135 | * @param string $name Case-insensitive header field name. |
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136 | * @return bool Returns true if any header names match the given header |
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137 | * name using a case-insensitive string comparison. Returns false if |
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138 | * no matching header name is found in the message. |
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139 | */ |
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140 | public function hasHeader($name) |
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147 | |||
148 | /** |
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149 | * Retrieves a message header value by the given case-insensitive name. |
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150 | * |
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151 | * This method returns an array of all the header values of the given |
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152 | * case-insensitive header name. |
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153 | * |
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154 | * If the header does not appear in the message, this method MUST return an |
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155 | * empty array. |
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156 | * |
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157 | * @param string $name Case-insensitive header field name. |
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158 | * @return string[] An array of string values as provided for the given |
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159 | * header. If the header does not appear in the message, this method MUST |
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160 | * return an empty array. |
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161 | */ |
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162 | public function getHeader($name) |
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173 | |||
174 | /** |
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175 | * Retrieves a comma-separated string of the values for a single header. |
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176 | * |
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177 | * This method returns all of the header values of the given |
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178 | * case-insensitive header name as a string concatenated together using |
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179 | * a comma. |
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180 | * |
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181 | * NOTE: Not all header values may be appropriately represented using |
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182 | * comma concatenation. For such headers, use getHeader() instead |
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183 | * and supply your own delimiter when concatenating. |
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184 | * |
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185 | * If the header does not appear in the message, this method MUST return |
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186 | * an empty string. |
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187 | * |
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188 | * @param string $name Case-insensitive header field name. |
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189 | * @return string A string of values as provided for the given header |
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190 | * concatenated together using a comma. If the header does not appear in |
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191 | * the message, this method MUST return an empty string. |
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192 | */ |
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193 | public function getHeaderLine($name) |
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197 | |||
198 | /** |
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199 | * Return an instance with the provided value replacing the specified header. |
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200 | * |
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201 | * While header names are case-insensitive, the casing of the header will |
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202 | * be preserved by this function, and returned from getHeaders(). |
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203 | * |
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204 | * This method MUST be implemented in such a way as to retain the |
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205 | * immutability of the message, and MUST return an instance that has the |
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206 | * new and/or updated header and value. |
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207 | * |
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208 | * @param string $name Case-insensitive header field name. |
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209 | * @param string|string[] $value Header value(s). |
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210 | * @return static |
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211 | * @throws \InvalidArgumentException for invalid header names or values. |
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212 | */ |
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213 | public function withHeader($name, $value) |
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223 | |||
224 | /** |
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225 | * Return an instance with the specified header appended with the given value. |
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226 | * |
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227 | * Existing values for the specified header will be maintained. The new |
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228 | * value(s) will be appended to the existing list. If the header did not |
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229 | * exist previously, it will be added. |
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230 | * |
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231 | * This method MUST be implemented in such a way as to retain the |
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232 | * immutability of the message, and MUST return an instance that has the |
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233 | * new header and/or value. |
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234 | * |
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235 | * @param string $name Case-insensitive header field name to add. |
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236 | * @param string|string[] $value Header value(s). |
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237 | * @return static |
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238 | * @throws \InvalidArgumentException for invalid header names or values. |
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239 | */ |
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240 | public function withAddedHeader($name, $value) |
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253 | |||
254 | /** |
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255 | * Return an instance without the specified header. |
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256 | * |
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257 | * Header resolution MUST be done without case-sensitivity. |
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258 | * |
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259 | * This method MUST be implemented in such a way as to retain the |
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260 | * immutability of the message, and MUST return an instance that removes |
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261 | * the named header. |
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262 | * |
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263 | * @param string $name Case-insensitive header field name to remove. |
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264 | * @return static |
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265 | */ |
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266 | public function withoutHeader($name) |
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277 | |||
278 | /** |
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279 | * Verifies the headers are valid. |
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280 | * |
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281 | * @throws InvalidArgumentException |
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282 | * @param array $headers Headers for the incoming request |
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283 | */ |
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284 | private function validateHeaders(array $headers) : void |
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310 | |||
311 | /** |
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312 | * Gets the body of the message. |
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313 | * |
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314 | * @return StreamInterface Returns the body as a stream. |
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315 | */ |
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316 | public function getBody() |
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320 | |||
321 | /** |
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322 | * Return an instance with the specified message body. |
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323 | * |
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324 | * The body MUST be a StreamInterface object. |
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325 | * |
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326 | * This method MUST be implemented in such a way as to retain the |
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327 | * immutability of the message, and MUST return a new instance that has the |
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328 | * new body stream. |
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329 | * |
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330 | * @param StreamInterface $body Body. |
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331 | * @return static |
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332 | * @throws \InvalidArgumentException When the body is not valid. |
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333 | */ |
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334 | public function withBody(StreamInterface $body) |
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342 | |||
343 | /** |
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344 | * Retrieves the message's request target. |
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345 | * |
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346 | * Retrieves the message's request-target either as it will appear (for |
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347 | * clients), as it appeared at request (for servers), or as it was |
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348 | * specified for the instance (see withRequestTarget()). |
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349 | * |
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350 | * In most cases, this will be the origin-form of the composed URI, |
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351 | * unless a value was provided to the concrete implementation (see |
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352 | * withRequestTarget() below). |
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353 | * |
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354 | * If no URI is available, and no request-target has been specifically |
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355 | * provided, this method MUST return the string "/". |
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356 | * |
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357 | * @return string |
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358 | */ |
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359 | public function getRequestTarget() |
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363 | |||
364 | /** |
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365 | * Return an instance with the specific request-target. |
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366 | * |
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367 | * If the request needs a non-origin-form request-target — e.g., for |
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368 | * specifying an absolute-form, authority-form, or asterisk-form — |
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369 | * this method may be used to create an instance with the specified |
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370 | * request-target, verbatim. |
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371 | * |
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372 | * This method MUST be implemented in such a way as to retain the |
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373 | * immutability of the message, and MUST return an instance that has the |
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374 | * changed request target. |
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375 | * |
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376 | * @link http://tools.ietf.org/html/rfc7230#section-5.3 (for the various |
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377 | * request-target forms allowed in request messages) |
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378 | * @param mixed $requestTarget |
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379 | * @return static |
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380 | */ |
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381 | public function withRequestTarget($requestTarget) |
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391 | |||
392 | /** |
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393 | * Verifies the HTTP method is valid. |
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394 | * |
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395 | * @throws InvalidArgumentException |
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396 | * @param string $method HTTP method for the incoming request |
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397 | */ |
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398 | private function validateMethod(string $method) : void |
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404 | |||
405 | /** |
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406 | * Retrieves the HTTP method of the request. |
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407 | * |
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408 | * @return string Returns the request method. |
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409 | */ |
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410 | public function getMethod() |
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414 | |||
415 | /** |
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416 | * Return an instance with the provided HTTP method. |
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417 | * |
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418 | * While HTTP method names are typically all uppercase characters, HTTP |
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419 | * method names are case-sensitive and thus implementations SHOULD NOT |
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420 | * modify the given string. |
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421 | * |
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422 | * This method MUST be implemented in such a way as to retain the |
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423 | * immutability of the message, and MUST return an instance that has the |
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424 | * changed request method. |
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425 | * |
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426 | * @param string $method Case-sensitive method. |
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427 | * @return static |
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428 | * @throws \InvalidArgumentException for invalid HTTP methods. |
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429 | */ |
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430 | public function withMethod($method) |
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434 | |||
435 | /** |
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436 | * Retrieves the URI instance. |
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437 | * |
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438 | * This method MUST return a UriInterface instance. |
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439 | * |
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440 | * @link http://tools.ietf.org/html/rfc3986#section-4.3 |
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441 | * @return UriInterface Returns a UriInterface instance |
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442 | * representing the URI of the request. |
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443 | */ |
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444 | public function getUri() |
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448 | |||
449 | /** |
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450 | * Returns an instance with the provided URI. |
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451 | * |
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452 | * This method MUST update the Host header of the returned request by |
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453 | * default if the URI contains a host component. If the URI does not |
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454 | * contain a host component, any pre-existing Host header MUST be carried |
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455 | * over to the returned request. |
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456 | * |
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457 | * You can opt-in to preserving the original state of the Host header by |
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458 | * setting `$preserveHost` to `true`. When `$preserveHost` is set to |
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459 | * `true`, this method interacts with the Host header in the following ways: |
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460 | * |
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461 | * - If the Host header is missing or empty, and the new URI contains |
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462 | * a host component, this method MUST update the Host header in the returned |
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463 | * request. |
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464 | * - If the Host header is missing or empty, and the new URI does not contain a |
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465 | * host component, this method MUST NOT update the Host header in the returned |
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466 | * request. |
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467 | * - If a Host header is present and non-empty, this method MUST NOT update |
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468 | * the Host header in the returned request. |
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469 | * |
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470 | * This method MUST be implemented in such a way as to retain the |
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471 | * immutability of the message, and MUST return an instance that has the |
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472 | * new UriInterface instance. |
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473 | * |
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474 | * @link http://tools.ietf.org/html/rfc3986#section-4.3 |
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475 | * @param UriInterface $uri New request URI to use. |
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476 | * @param bool $preserveHost Preserve the original state of the Host header. |
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477 | * @return static |
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478 | */ |
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479 | public function withUri(UriInterface $uri, $preserveHost = false) |
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483 | |||
484 | /** |
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485 | * Retrieve server parameters. |
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486 | * |
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487 | * Retrieves data related to the incoming request environment, |
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488 | * typically derived from PHP's $_SERVER superglobal. The data IS NOT |
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489 | * REQUIRED to originate from $_SERVER. |
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490 | * |
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491 | * @return array |
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492 | */ |
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493 | public function getServerParams() |
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497 | |||
498 | /** |
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499 | * Retrieve cookies. |
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500 | * |
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501 | * Retrieves cookies sent by the client to the server. |
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502 | * |
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503 | * The data MUST be compatible with the structure of the $_COOKIE |
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504 | * superglobal. |
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505 | * |
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506 | * @return array |
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507 | */ |
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508 | public function getCookieParams() |
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512 | |||
513 | /** |
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514 | * Return an instance with the specified cookies. |
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515 | * |
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516 | * The data IS NOT REQUIRED to come from the $_COOKIE superglobal, but MUST |
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517 | * be compatible with the structure of $_COOKIE. Typically, this data will |
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518 | * be injected at instantiation. |
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519 | * |
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520 | * This method MUST NOT update the related Cookie header of the request |
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521 | * instance, nor related values in the server params. |
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522 | * |
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523 | * This method MUST be implemented in such a way as to retain the |
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524 | * immutability of the message, and MUST return an instance that has the |
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525 | * updated cookie values. |
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526 | * |
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527 | * @param array $cookies Array of key/value pairs representing cookies. |
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528 | * @return static |
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529 | */ |
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530 | public function withCookieParams(array $cookies) |
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534 | |||
535 | /** |
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536 | * Retrieve query string arguments. |
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537 | * |
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538 | * Retrieves the deserialized query string arguments, if any. |
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539 | * |
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540 | * Note: the query params might not be in sync with the URI or server |
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541 | * params. If you need to ensure you are only getting the original |
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542 | * values, you may need to parse the query string from `getUri()->getQuery()` |
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543 | * or from the `QUERY_STRING` server param. |
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544 | * |
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545 | * @return array |
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546 | */ |
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547 | public function getQueryParams() |
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551 | |||
552 | /** |
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553 | * Return an instance with the specified query string arguments. |
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554 | * |
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555 | * These values SHOULD remain immutable over the course of the incoming |
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556 | * request. They MAY be injected during instantiation, such as from PHP's |
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557 | * $_GET superglobal, or MAY be derived from some other value such as the |
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558 | * URI. In cases where the arguments are parsed from the URI, the data |
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559 | * MUST be compatible with what PHP's parse_str() would return for |
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560 | * purposes of how duplicate query parameters are handled, and how nested |
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561 | * sets are handled. |
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562 | * |
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563 | * Setting query string arguments MUST NOT change the URI stored by the |
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564 | * request, nor the values in the server params. |
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565 | * |
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566 | * This method MUST be implemented in such a way as to retain the |
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567 | * immutability of the message, and MUST return an instance that has the |
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568 | * updated query string arguments. |
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569 | * |
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570 | * @param array $query Array of query string arguments, typically from |
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571 | * $_GET. |
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572 | * @return static |
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573 | */ |
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574 | public function withQueryParams(array $query) |
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578 | |||
579 | /** |
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580 | * Retrieve normalized file upload data. |
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581 | * |
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582 | * This method returns upload metadata in a normalized tree, with each leaf |
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583 | * an instance of Psr\Http\Message\UploadedFileInterface. |
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584 | * |
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585 | * These values MAY be prepared from $_FILES or the message body during |
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586 | * instantiation, or MAY be injected via withUploadedFiles(). |
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587 | * |
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588 | * @return array An array tree of UploadedFileInterface instances; an empty |
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589 | * array MUST be returned if no data is present. |
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590 | */ |
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591 | public function getUploadedFiles() |
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595 | |||
596 | /** |
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597 | * Create a new instance with the specified uploaded files. |
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598 | * |
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599 | * This method MUST be implemented in such a way as to retain the |
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600 | * immutability of the message, and MUST return an instance that has the |
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601 | * updated body parameters. |
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602 | * |
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603 | * @param array $uploadedFiles An array tree of UploadedFileInterface instances. |
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604 | * @return static |
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605 | * @throws \InvalidArgumentException if an invalid structure is provided. |
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606 | */ |
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607 | public function withUploadedFiles(array $uploadedFiles) |
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611 | |||
612 | /** |
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613 | * Retrieve any parameters provided in the request body. |
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614 | * |
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615 | * If the request Content-Type is either application/x-www-form-urlencoded |
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616 | * or multipart/form-data, and the request method is POST, this method MUST |
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617 | * return the contents of $_POST. |
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618 | * |
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619 | * Otherwise, this method may return any results of deserializing |
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620 | * the request body content; as parsing returns structured content, the |
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621 | * potential types MUST be arrays or objects only. A null value indicates |
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622 | * the absence of body content. |
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623 | * |
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624 | * @return null|array|object The deserialized body parameters, if any. |
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625 | * These will typically be an array or object. |
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626 | */ |
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627 | public function getParsedBody() |
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631 | |||
632 | /** |
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633 | * Return an instance with the specified body parameters. |
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634 | * |
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635 | * These MAY be injected during instantiation. |
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636 | * |
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637 | * If the request Content-Type is either application/x-www-form-urlencoded |
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638 | * or multipart/form-data, and the request method is POST, use this method |
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639 | * ONLY to inject the contents of $_POST. |
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640 | * |
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641 | * The data IS NOT REQUIRED to come from $_POST, but MUST be the results of |
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642 | * deserializing the request body content. Deserialization/parsing returns |
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643 | * structured data, and, as such, this method ONLY accepts arrays or objects, |
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644 | * or a null value if nothing was available to parse. |
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645 | * |
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646 | * As an example, if content negotiation determines that the request data |
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647 | * is a JSON payload, this method could be used to create a request |
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648 | * instance with the deserialized parameters. |
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649 | * |
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650 | * This method MUST be implemented in such a way as to retain the |
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651 | * immutability of the message, and MUST return an instance that has the |
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652 | * updated body parameters. |
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653 | * |
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654 | * @param null|array|object $data The deserialized body data. This will |
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655 | * typically be in an array or object. |
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656 | * @return static |
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657 | * @throws \InvalidArgumentException if an unsupported argument type is |
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658 | * provided. |
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659 | */ |
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660 | public function withParsedBody($data) |
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664 | |||
665 | /** |
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666 | * Retrieve attributes derived from the request. |
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667 | * |
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668 | * The request "attributes" may be used to allow injection of any |
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669 | * parameters derived from the request: e.g., the results of path |
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670 | * match operations; the results of decrypting cookies; the results of |
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671 | * deserializing non-form-encoded message bodies; etc. Attributes |
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672 | * will be application and request specific, and CAN be mutable. |
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673 | * |
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674 | * @return array Attributes derived from the request. |
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675 | */ |
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676 | public function getAttributes() |
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680 | |||
681 | /** |
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682 | * Retrieve a single derived request attribute. |
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683 | * |
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684 | * Retrieves a single derived request attribute as described in |
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685 | * getAttributes(). If the attribute has not been previously set, returns |
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686 | * the default value as provided. |
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687 | * |
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688 | * This method obviates the need for a hasAttribute() method, as it allows |
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689 | * specifying a default value to return if the attribute is not found. |
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690 | * |
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691 | * @param string $name The attribute name. |
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692 | * @param mixed $default Default value to return if the attribute does not exist. |
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693 | * @return mixed |
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694 | * @see getAttributes() |
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695 | */ |
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696 | public function getAttribute($name, $default = null) |
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700 | |||
701 | /** |
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702 | * Return an instance with the specified derived request attribute. |
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703 | * |
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704 | * This method allows setting a single derived request attribute as |
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705 | * described in getAttributes(). |
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706 | * |
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707 | * This method MUST be implemented in such a way as to retain the |
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708 | * immutability of the message, and MUST return an instance that has the |
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709 | * updated attribute. |
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710 | * |
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711 | * @param string $name The attribute name. |
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712 | * @param mixed $value The value of the attribute. |
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713 | * @return static |
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714 | * @see getAttributes() |
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715 | */ |
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716 | public function withAttribute($name, $value) |
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720 | |||
721 | /** |
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722 | * Return an instance that removes the specified derived request attribute. |
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723 | * |
||
724 | * This method allows removing a single derived request attribute as |
||
725 | * described in getAttributes(). |
||
726 | * |
||
727 | * This method MUST be implemented in such a way as to retain the |
||
728 | * immutability of the message, and MUST return an instance that removes |
||
729 | * the attribute. |
||
730 | * |
||
731 | * @param string $name The attribute name. |
||
732 | * @return static |
||
733 | * @see getAttributes() |
||
734 | */ |
||
735 | public function withoutAttribute($name) |
||
739 | } |
||
740 |