Request.php 49.7 KB
Newer Older
Qiang Xue committed
1 2 3
<?php
/**
 * @link http://www.yiiframework.com/
Qiang Xue committed
4
 * @copyright Copyright (c) 2008 Yii Software LLC
Qiang Xue committed
5 6 7
 * @license http://www.yiiframework.com/license/
 */

Qiang Xue committed
8
namespace yii\web;
Qiang Xue committed
9

Qiang Xue committed
10 11
use Yii;
use yii\base\InvalidConfigException;
12
use yii\helpers\StringHelper;
Qiang Xue committed
13

Qiang Xue committed
14
/**
15 16 17 18 19
 * The web Request class represents an HTTP request
 *
 * It encapsulates the $_SERVER variable and resolves its inconsistency among different Web servers.
 * Also it provides an interface to retrieve request parameters from $_POST, $_GET, $_COOKIES and REST
 * parameters sent via other HTTP methods like PUT or DELETE.
20
 *
21
 * Request is configured as an application component in [[\yii\web\Application]] by default.
22 23
 * You can access that instance via `Yii::$app->request`.
 *
24
 * @property string $absoluteUrl The currently requested absolute URL. This property is read-only.
25 26 27
 * @property array $acceptableContentTypes The content types ordered by the quality score. Types with the
 * highest scores will be returned first. The array keys are the content types, while the array values are the
 * corresponding quality score and other parameters as given in the header.
28
 * @property array $acceptableLanguages The languages ordered by the preference level. The first element
29
 * represents the most preferred language.
30 31 32 33
 * @property string $authPassword The password sent via HTTP authentication, null if the password is not
 * given. This property is read-only.
 * @property string $authUser The username sent via HTTP authentication, null if the username is not given.
 * This property is read-only.
34
 * @property string $baseUrl The relative URL for the application.
35 36 37
 * @property array $bodyParams The request parameters given in the request body.
 * @property string $contentType Request content-type. Null is returned if this information is not available.
 * This property is read-only.
38
 * @property CookieCollection $cookies The cookie collection. This property is read-only.
39
 * @property string $csrfToken The token used to perform CSRF validation. This property is read-only.
Qiang Xue committed
40 41
 * @property string $csrfTokenFromHeader The CSRF token sent via [[CSRF_HEADER]] by browser. Null is returned
 * if no such header is sent. This property is read-only.
42
 * @property array $eTags The entity tags. This property is read-only.
43
 * @property HeaderCollection $headers The header collection. This property is read-only.
44 45 46 47 48 49
 * @property string $hostInfo Schema and hostname part (with port number if needed) of the request URL (e.g.
 * `http://www.yiiframework.com`).
 * @property boolean $isAjax Whether this is an AJAX (XMLHttpRequest) request. This property is read-only.
 * @property boolean $isDelete Whether this is a DELETE request. This property is read-only.
 * @property boolean $isFlash Whether this is an Adobe Flash or Adobe Flex request. This property is
 * read-only.
50 51 52
 * @property boolean $isGet Whether this is a GET request. This property is read-only.
 * @property boolean $isHead Whether this is a HEAD request. This property is read-only.
 * @property boolean $isOptions Whether this is a OPTIONS request. This property is read-only.
53
 * @property boolean $isPatch Whether this is a PATCH request. This property is read-only.
54
 * @property boolean $isPjax Whether this is a PJAX request. This property is read-only.
55 56 57 58 59 60 61 62
 * @property boolean $isPost Whether this is a POST request. This property is read-only.
 * @property boolean $isPut Whether this is a PUT request. This property is read-only.
 * @property boolean $isSecureConnection If the request is sent via secure channel (https). This property is
 * read-only.
 * @property string $method Request method, such as GET, POST, HEAD, PUT, PATCH, DELETE. The value returned is
 * turned into upper case. This property is read-only.
 * @property string $pathInfo Part of the request URL that is after the entry script and before the question
 * mark. Note, the returned path info is already URL-decoded.
63
 * @property integer $port Port number for insecure requests.
64
 * @property array $queryParams The request GET parameter values.
65 66 67
 * @property string $queryString Part of the request URL that is after the question mark. This property is
 * read-only.
 * @property string $rawBody The request body. This property is read-only.
68
 * @property string $rawCsrfToken The random token for CSRF validation. This property is read-only.
69
 * @property string $referrer URL referrer, null if not present. This property is read-only.
70 71 72
 * @property string $scriptFile The entry script file path.
 * @property string $scriptUrl The relative URL of the entry script.
 * @property integer $securePort Port number for secure requests.
73 74
 * @property string $serverName Server name. This property is read-only.
 * @property integer $serverPort Server port number. This property is read-only.
75
 * @property string $url The currently requested relative URL. Note that the URI returned is URL-encoded.
76 77
 * @property string $userAgent User agent, null if not present. This property is read-only.
 * @property string $userHost User host name, null if cannot be determined. This property is read-only.
Carsten Brandt committed
78 79
 * @property string $userIP User IP address. Null is returned if the user IP address cannot be detected. This
 * property is read-only.
80
 *
Qiang Xue committed
81
 * @author Qiang Xue <qiang.xue@gmail.com>
Qiang Xue committed
82
 * @since 2.0
Qiang Xue committed
83
 */
Qiang Xue committed
84
class Request extends \yii\base\Request
Qiang Xue committed
85
{
86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101
    /**
     * The name of the HTTP header for sending CSRF token.
     */
    const CSRF_HEADER = 'X-CSRF-Token';
    /**
     * The length of the CSRF token mask.
     */
    const CSRF_MASK_LENGTH = 8;

    /**
     * @var boolean whether to enable CSRF (Cross-Site Request Forgery) validation. Defaults to true.
     * When CSRF validation is enabled, forms submitted to an Yii Web application must be originated
     * from the same application. If not, a 400 HTTP exception will be raised.
     *
     * Note, this feature requires that the user client accepts cookie. Also, to use this feature,
     * forms submitted via POST method must contain a hidden input whose name is specified by [[csrfParam]].
102
     * You may use [[\yii\helpers\Html::beginForm()]] to generate his hidden input.
103 104 105
     *
     * In JavaScript, you may get the values of [[csrfParam]] and [[csrfToken]] via `yii.getCsrfParam()` and
     * `yii.getCsrfToken()`, respectively. The [[\yii\web\YiiAsset]] asset must be registered.
106
     * You also need to include CSRF meta tags in your pages by using [[\yii\helpers\Html::csrfMetaTags()]].
107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125
     *
     * @see Controller::enableCsrfValidation
     * @see http://en.wikipedia.org/wiki/Cross-site_request_forgery
     */
    public $enableCsrfValidation = true;
    /**
     * @var string the name of the token used to prevent CSRF. Defaults to '_csrf'.
     * This property is used only when [[enableCsrfValidation]] is true.
     */
    public $csrfParam = '_csrf';
    /**
     * @var array the configuration of the CSRF cookie. This property is used only when [[enableCsrfValidation]] is true.
     * @see Cookie
     */
    public $csrfCookie = ['httpOnly' => true];
    /**
     * @var boolean whether cookies should be validated to ensure they are not tampered. Defaults to true.
     */
    public $enableCookieValidation = true;
126 127 128 129
    /**
     * @var string a secret key used for cookie validation. This property must be set if [[enableCookieValidation]] is true.
     */
    public $cookieValidationKey;
130
    /**
131 132
     * @var string the name of the POST parameter that is used to indicate if a request is a PUT, PATCH or DELETE
     * request tunneled through POST. Defaults to '_method'.
133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166
     * @see getMethod()
     * @see getBodyParams()
     */
    public $methodParam = '_method';
    /**
     * @var array the parsers for converting the raw HTTP request body into [[bodyParams]].
     * The array keys are the request `Content-Types`, and the array values are the
     * corresponding configurations for [[Yii::createObject|creating the parser objects]].
     * A parser must implement the [[RequestParserInterface]].
     *
     * To enable parsing for JSON requests you can use the [[JsonParser]] class like in the following example:
     *
     * ```
     * [
     *     'application/json' => 'yii\web\JsonParser',
     * ]
     * ```
     *
     * To register a parser for parsing all request types you can use `'*'` as the array key.
     * This one will be used as a fallback in case no other types match.
     *
     * @see getBodyParams()
     */
    public $parsers = [];

    /**
     * @var CookieCollection Collection of request cookies.
     */
    private $_cookies;
    /**
     * @var array the headers in this collection (indexed by the header names)
     */
    private $_headers;

167

168 169
    /**
     * Resolves the current request into a route and the associated parameters.
170
     * @return array the first element is the route, and the second is the associated parameters.
171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219
     * @throws HttpException if the request cannot be resolved.
     */
    public function resolve()
    {
        $result = Yii::$app->getUrlManager()->parseRequest($this);
        if ($result !== false) {
            list ($route, $params) = $result;
            $_GET = array_merge($_GET, $params);

            return [$route, $_GET];
        } else {
            throw new NotFoundHttpException(Yii::t('yii', 'Page not found.'));
        }
    }

    /**
     * Returns the header collection.
     * The header collection contains incoming HTTP headers.
     * @return HeaderCollection the header collection
     */
    public function getHeaders()
    {
        if ($this->_headers === null) {
            $this->_headers = new HeaderCollection;
            if (function_exists('getallheaders')) {
                $headers = getallheaders();
            } elseif (function_exists('http_get_request_headers')) {
                $headers = http_get_request_headers();
            } else {
                foreach ($_SERVER as $name => $value) {
                    if (strncmp($name, 'HTTP_', 5) === 0) {
                        $name = str_replace(' ', '-', ucwords(strtolower(str_replace('_', ' ', substr($name, 5)))));
                        $this->_headers->add($name, $value);
                    }
                }

                return $this->_headers;
            }
            foreach ($headers as $name => $value) {
                $this->_headers->add($name, $value);
            }
        }

        return $this->_headers;
    }

    /**
     * Returns the method of the current request (e.g. GET, POST, HEAD, PUT, PATCH, DELETE).
     * @return string request method, such as GET, POST, HEAD, PUT, PATCH, DELETE.
220
     * The value returned is turned into upper case.
221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338
     */
    public function getMethod()
    {
        if (isset($_POST[$this->methodParam])) {
            return strtoupper($_POST[$this->methodParam]);
        } elseif (isset($_SERVER['HTTP_X_HTTP_METHOD_OVERRIDE'])) {
            return strtoupper($_SERVER['HTTP_X_HTTP_METHOD_OVERRIDE']);
        } else {
            return isset($_SERVER['REQUEST_METHOD']) ? strtoupper($_SERVER['REQUEST_METHOD']) : 'GET';
        }
    }

    /**
     * Returns whether this is a GET request.
     * @return boolean whether this is a GET request.
     */
    public function getIsGet()
    {
        return $this->getMethod() === 'GET';
    }

    /**
     * Returns whether this is an OPTIONS request.
     * @return boolean whether this is a OPTIONS request.
     */
    public function getIsOptions()
    {
        return $this->getMethod() === 'OPTIONS';
    }

    /**
     * Returns whether this is a HEAD request.
     * @return boolean whether this is a HEAD request.
     */
    public function getIsHead()
    {
        return $this->getMethod() === 'HEAD';
    }

    /**
     * Returns whether this is a POST request.
     * @return boolean whether this is a POST request.
     */
    public function getIsPost()
    {
        return $this->getMethod() === 'POST';
    }

    /**
     * Returns whether this is a DELETE request.
     * @return boolean whether this is a DELETE request.
     */
    public function getIsDelete()
    {
        return $this->getMethod() === 'DELETE';
    }

    /**
     * Returns whether this is a PUT request.
     * @return boolean whether this is a PUT request.
     */
    public function getIsPut()
    {
        return $this->getMethod() === 'PUT';
    }

    /**
     * Returns whether this is a PATCH request.
     * @return boolean whether this is a PATCH request.
     */
    public function getIsPatch()
    {
        return $this->getMethod() === 'PATCH';
    }

    /**
     * Returns whether this is an AJAX (XMLHttpRequest) request.
     * @return boolean whether this is an AJAX (XMLHttpRequest) request.
     */
    public function getIsAjax()
    {
        return isset($_SERVER['HTTP_X_REQUESTED_WITH']) && $_SERVER['HTTP_X_REQUESTED_WITH'] === 'XMLHttpRequest';
    }

    /**
     * Returns whether this is a PJAX request
     * @return boolean whether this is a PJAX request
     */
    public function getIsPjax()
    {
        return $this->getIsAjax() && !empty($_SERVER['HTTP_X_PJAX']);
    }

    /**
     * Returns whether this is an Adobe Flash or Flex request.
     * @return boolean whether this is an Adobe Flash or Adobe Flex request.
     */
    public function getIsFlash()
    {
        return isset($_SERVER['HTTP_USER_AGENT']) &&
            (stripos($_SERVER['HTTP_USER_AGENT'], 'Shockwave') !== false || stripos($_SERVER['HTTP_USER_AGENT'], 'Flash') !== false);
    }

    private $_rawBody;

    /**
     * Returns the raw HTTP request body.
     * @return string the request body
     */
    public function getRawBody()
    {
        if ($this->_rawBody === null) {
            $this->_rawBody = file_get_contents('php://input');
        }

        return $this->_rawBody;
    }

339 340 341 342 343 344 345 346 347
    /**
     * Sets the raw HTTP request body, this method is mainly used by test scripts to simulate raw HTTP requests.
     * @param $rawBody
     */
    public function setRawBody($rawBody)
    {
        $this->_rawBody = $rawBody;
    }

348 349 350 351 352 353
    private $_bodyParams;

    /**
     * Returns the request parameters given in the request body.
     *
     * Request parameters are determined using the parsers configured in [[parsers]] property.
354
     * If no parsers are configured for the current [[contentType]] it uses the PHP function `mb_parse_str()`
355
     * to parse the [[rawBody|request body]].
356
     * @return array the request parameters given in the request body.
357 358 359 360 361 362 363 364
     * @throws \yii\base\InvalidConfigException if a registered parser does not implement the [[RequestParserInterface]].
     * @see getMethod()
     * @see getBodyParam()
     * @see setBodyParams()
     */
    public function getBodyParams()
    {
        if ($this->_bodyParams === null) {
365
            if (isset($_POST[$this->methodParam])) {
366 367
                $this->_bodyParams = $_POST;
                unset($this->_bodyParams[$this->methodParam]);
368 369 370 371 372 373 374 375 376 377
                return $this->_bodyParams;
            }

            $contentType = $this->getContentType();
            if (($pos = strpos($contentType, ';')) !== false) {
                // e.g. application/json; charset=UTF-8
                $contentType = substr($contentType, 0, $pos);
            }

            if (isset($this->parsers[$contentType])) {
378 379 380 381 382 383 384 385 386 387 388
                $parser = Yii::createObject($this->parsers[$contentType]);
                if (!($parser instanceof RequestParserInterface)) {
                    throw new InvalidConfigException("The '$contentType' request parser is invalid. It must implement the yii\\web\\RequestParserInterface.");
                }
                $this->_bodyParams = $parser->parse($this->getRawBody(), $contentType);
            } elseif (isset($this->parsers['*'])) {
                $parser = Yii::createObject($this->parsers['*']);
                if (!($parser instanceof RequestParserInterface)) {
                    throw new InvalidConfigException("The fallback request parser is invalid. It must implement the yii\\web\\RequestParserInterface.");
                }
                $this->_bodyParams = $parser->parse($this->getRawBody(), $contentType);
389 390 391
            } elseif ($this->getMethod() === 'POST') {
                // PHP has already parsed the body so we have all params in $_POST
                $this->_bodyParams = $_POST;
392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413
            } else {
                $this->_bodyParams = [];
                mb_parse_str($this->getRawBody(), $this->_bodyParams);
            }
        }

        return $this->_bodyParams;
    }

    /**
     * Sets the request body parameters.
     * @param array $values the request body parameters (name-value pairs)
     * @see getBodyParam()
     * @see getBodyParams()
     */
    public function setBodyParams($values)
    {
        $this->_bodyParams = $values;
    }

    /**
     * Returns the named request body parameter value.
414 415 416
     * @param string $name the parameter name
     * @param mixed $defaultValue the default parameter value if the parameter does not exist.
     * @return mixed the parameter value
417 418 419 420 421 422 423 424 425 426 427 428 429
     * @see getBodyParams()
     * @see setBodyParams()
     */
    public function getBodyParam($name, $defaultValue = null)
    {
        $params = $this->getBodyParams();

        return isset($params[$name]) ? $params[$name] : $defaultValue;
    }

    /**
     * Returns POST parameter with a given name. If name isn't specified, returns an array of all POST parameters.
     *
430 431
     * @param string $name the parameter name
     * @param mixed $defaultValue the default parameter value if the parameter does not exist.
432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474
     * @return array|mixed
     */
    public function post($name = null, $defaultValue = null)
    {
        if ($name === null) {
            return $this->getBodyParams();
        } else {
            return $this->getBodyParam($name, $defaultValue);
        }
    }

    private $_queryParams;

    /**
     * Returns the request parameters given in the [[queryString]].
     *
     * This method will return the contents of `$_GET` if params where not explicitly set.
     * @return array the request GET parameter values.
     * @see setQueryParams()
     */
    public function getQueryParams()
    {
        if ($this->_queryParams === null) {
            return $_GET;
        }

        return $this->_queryParams;
    }

    /**
     * Sets the request [[queryString]] parameters.
     * @param array $values the request query parameters (name-value pairs)
     * @see getQueryParam()
     * @see getQueryParams()
     */
    public function setQueryParams($values)
    {
        $this->_queryParams = $values;
    }

    /**
     * Returns GET parameter with a given name. If name isn't specified, returns an array of all GET parameters.
     *
475 476
     * @param string $name the parameter name
     * @param mixed $defaultValue the default parameter value if the parameter does not exist.
477 478 479 480 481 482 483 484 485 486 487 488 489 490
     * @return array|mixed
     */
    public function get($name = null, $defaultValue = null)
    {
        if ($name === null) {
            return $this->getQueryParams();
        } else {
            return $this->getQueryParam($name, $defaultValue);
        }
    }

    /**
     * Returns the named GET parameter value.
     * If the GET parameter does not exist, the second parameter to this method will be returned.
491 492 493
     * @param string $name the GET parameter name. If not specified, whole $_GET is returned.
     * @param mixed $defaultValue the default parameter value if the GET parameter does not exist.
     * @return mixed the GET parameter value
494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576
     * @see getBodyParam()
     */
    public function getQueryParam($name, $defaultValue = null)
    {
        $params = $this->getQueryParams();

        return isset($params[$name]) ? $params[$name] : $defaultValue;
    }

    private $_hostInfo;

    /**
     * Returns the schema and host part of the current request URL.
     * The returned URL does not have an ending slash.
     * By default this is determined based on the user request information.
     * You may explicitly specify it by setting the [[setHostInfo()|hostInfo]] property.
     * @return string schema and hostname part (with port number if needed) of the request URL (e.g. `http://www.yiiframework.com`)
     * @see setHostInfo()
     */
    public function getHostInfo()
    {
        if ($this->_hostInfo === null) {
            $secure = $this->getIsSecureConnection();
            $http = $secure ? 'https' : 'http';
            if (isset($_SERVER['HTTP_HOST'])) {
                $this->_hostInfo = $http . '://' . $_SERVER['HTTP_HOST'];
            } else {
                $this->_hostInfo = $http . '://' . $_SERVER['SERVER_NAME'];
                $port = $secure ? $this->getSecurePort() : $this->getPort();
                if (($port !== 80 && !$secure) || ($port !== 443 && $secure)) {
                    $this->_hostInfo .= ':' . $port;
                }
            }
        }

        return $this->_hostInfo;
    }

    /**
     * Sets the schema and host part of the application URL.
     * This setter is provided in case the schema and hostname cannot be determined
     * on certain Web servers.
     * @param string $value the schema and host part of the application URL. The trailing slashes will be removed.
     */
    public function setHostInfo($value)
    {
        $this->_hostInfo = rtrim($value, '/');
    }

    private $_baseUrl;

    /**
     * Returns the relative URL for the application.
     * This is similar to [[scriptUrl]] except that it does not include the script file name,
     * and the ending slashes are removed.
     * @return string the relative URL for the application
     * @see setScriptUrl()
     */
    public function getBaseUrl()
    {
        if ($this->_baseUrl === null) {
            $this->_baseUrl = rtrim(dirname($this->getScriptUrl()), '\\/');
        }

        return $this->_baseUrl;
    }

    /**
     * Sets the relative URL for the application.
     * By default the URL is determined based on the entry script URL.
     * This setter is provided in case you want to change this behavior.
     * @param string $value the relative URL for the application
     */
    public function setBaseUrl($value)
    {
        $this->_baseUrl = $value;
    }

    private $_scriptUrl;

    /**
     * Returns the relative URL of the entry script.
     * The implementation of this method referenced Zend_Controller_Request_Http in Zend Framework.
577
     * @return string the relative URL of the entry script.
578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643
     * @throws InvalidConfigException if unable to determine the entry script URL
     */
    public function getScriptUrl()
    {
        if ($this->_scriptUrl === null) {
            $scriptFile = $this->getScriptFile();
            $scriptName = basename($scriptFile);
            if (basename($_SERVER['SCRIPT_NAME']) === $scriptName) {
                $this->_scriptUrl = $_SERVER['SCRIPT_NAME'];
            } elseif (basename($_SERVER['PHP_SELF']) === $scriptName) {
                $this->_scriptUrl = $_SERVER['PHP_SELF'];
            } elseif (isset($_SERVER['ORIG_SCRIPT_NAME']) && basename($_SERVER['ORIG_SCRIPT_NAME']) === $scriptName) {
                $this->_scriptUrl = $_SERVER['ORIG_SCRIPT_NAME'];
            } elseif (($pos = strpos($_SERVER['PHP_SELF'], '/' . $scriptName)) !== false) {
                $this->_scriptUrl = substr($_SERVER['SCRIPT_NAME'], 0, $pos) . '/' . $scriptName;
            } elseif (!empty($_SERVER['DOCUMENT_ROOT']) && strpos($scriptFile, $_SERVER['DOCUMENT_ROOT']) === 0) {
                $this->_scriptUrl = str_replace('\\', '/', str_replace($_SERVER['DOCUMENT_ROOT'], '', $scriptFile));
            } else {
                throw new InvalidConfigException('Unable to determine the entry script URL.');
            }
        }

        return $this->_scriptUrl;
    }

    /**
     * Sets the relative URL for the application entry script.
     * This setter is provided in case the entry script URL cannot be determined
     * on certain Web servers.
     * @param string $value the relative URL for the application entry script.
     */
    public function setScriptUrl($value)
    {
        $this->_scriptUrl = '/' . trim($value, '/');
    }

    private $_scriptFile;

    /**
     * Returns the entry script file path.
     * The default implementation will simply return `$_SERVER['SCRIPT_FILENAME']`.
     * @return string the entry script file path
     */
    public function getScriptFile()
    {
        return isset($this->_scriptFile) ? $this->_scriptFile : $_SERVER['SCRIPT_FILENAME'];
    }

    /**
     * Sets the entry script file path.
     * The entry script file path normally can be obtained from `$_SERVER['SCRIPT_FILENAME']`.
     * If your server configuration does not return the correct value, you may configure
     * this property to make it right.
     * @param string $value the entry script file path.
     */
    public function setScriptFile($value)
    {
        $this->_scriptFile = $value;
    }

    private $_pathInfo;

    /**
     * Returns the path info of the currently requested URL.
     * A path info refers to the part that is after the entry script and before the question mark (query string).
     * The starting and ending slashes are both removed.
644 645
     * @return string part of the request URL that is after the entry script and before the question mark.
     * Note, the returned path info is already URL-decoded.
646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670
     * @throws InvalidConfigException if the path info cannot be determined due to unexpected server configuration
     */
    public function getPathInfo()
    {
        if ($this->_pathInfo === null) {
            $this->_pathInfo = $this->resolvePathInfo();
        }

        return $this->_pathInfo;
    }

    /**
     * Sets the path info of the current request.
     * This method is mainly provided for testing purpose.
     * @param string $value the path info of the current request
     */
    public function setPathInfo($value)
    {
        $this->_pathInfo = ltrim($value, '/');
    }

    /**
     * Resolves the path info part of the currently requested URL.
     * A path info refers to the part that is after the entry script and before the question mark (query string).
     * The starting slashes are both removed (ending slashes will be kept).
671 672
     * @return string part of the request URL that is after the entry script and before the question mark.
     * Note, the returned path info is decoded.
673 674 675 676 677 678 679 680 681 682 683 684 685 686 687
     * @throws InvalidConfigException if the path info cannot be determined due to unexpected server configuration
     */
    protected function resolvePathInfo()
    {
        $pathInfo = $this->getUrl();

        if (($pos = strpos($pathInfo, '?')) !== false) {
            $pathInfo = substr($pathInfo, 0, $pos);
        }

        $pathInfo = urldecode($pathInfo);

        // try to encode in UTF8 if not so
        // http://w3.org/International/questions/qa-forms-utf-8.html
        if (!preg_match('%^(?:
Carsten Brandt committed
688 689 690 691 692 693 694 695 696 697
            [\x09\x0A\x0D\x20-\x7E]              # ASCII
            | [\xC2-\xDF][\x80-\xBF]             # non-overlong 2-byte
            | \xE0[\xA0-\xBF][\x80-\xBF]         # excluding overlongs
            | [\xE1-\xEC\xEE\xEF][\x80-\xBF]{2}  # straight 3-byte
            | \xED[\x80-\x9F][\x80-\xBF]         # excluding surrogates
            | \xF0[\x90-\xBF][\x80-\xBF]{2}      # planes 1-3
            | [\xF1-\xF3][\x80-\xBF]{3}          # planes 4-15
            | \xF4[\x80-\x8F][\x80-\xBF]{2}      # plane 16
            )*$%xs', $pathInfo)
        ) {
698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735
            $pathInfo = utf8_encode($pathInfo);
        }

        $scriptUrl = $this->getScriptUrl();
        $baseUrl = $this->getBaseUrl();
        if (strpos($pathInfo, $scriptUrl) === 0) {
            $pathInfo = substr($pathInfo, strlen($scriptUrl));
        } elseif ($baseUrl === '' || strpos($pathInfo, $baseUrl) === 0) {
            $pathInfo = substr($pathInfo, strlen($baseUrl));
        } elseif (isset($_SERVER['PHP_SELF']) && strpos($_SERVER['PHP_SELF'], $scriptUrl) === 0) {
            $pathInfo = substr($_SERVER['PHP_SELF'], strlen($scriptUrl));
        } else {
            throw new InvalidConfigException('Unable to determine the path info of the current request.');
        }

        if ($pathInfo[0] === '/') {
            $pathInfo = substr($pathInfo, 1);
        }

        return (string) $pathInfo;
    }

    /**
     * Returns the currently requested absolute URL.
     * This is a shortcut to the concatenation of [[hostInfo]] and [[url]].
     * @return string the currently requested absolute URL.
     */
    public function getAbsoluteUrl()
    {
        return $this->getHostInfo() . $this->getUrl();
    }

    private $_url;

    /**
     * Returns the currently requested relative URL.
     * This refers to the portion of the URL that is after the [[hostInfo]] part.
     * It includes the [[queryString]] part if any.
736
     * @return string the currently requested relative URL. Note that the URI returned is URL-encoded.
737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762
     * @throws InvalidConfigException if the URL cannot be determined due to unusual server configuration
     */
    public function getUrl()
    {
        if ($this->_url === null) {
            $this->_url = $this->resolveRequestUri();
        }

        return $this->_url;
    }

    /**
     * Sets the currently requested relative URL.
     * The URI must refer to the portion that is after [[hostInfo]].
     * Note that the URI should be URL-encoded.
     * @param string $value the request URI to be set
     */
    public function setUrl($value)
    {
        $this->_url = $value;
    }

    /**
     * Resolves the request URI portion for the currently requested URL.
     * This refers to the portion that is after the [[hostInfo]] part. It includes the [[queryString]] part if any.
     * The implementation of this method referenced Zend_Controller_Request_Http in Zend Framework.
763 764
     * @return string|boolean the request URI portion for the currently requested URL.
     * Note that the URI returned is URL-encoded.
765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844
     * @throws InvalidConfigException if the request URI cannot be determined due to unusual server configuration
     */
    protected function resolveRequestUri()
    {
        if (isset($_SERVER['HTTP_X_REWRITE_URL'])) { // IIS
            $requestUri = $_SERVER['HTTP_X_REWRITE_URL'];
        } elseif (isset($_SERVER['REQUEST_URI'])) {
            $requestUri = $_SERVER['REQUEST_URI'];
            if ($requestUri !== '' && $requestUri[0] !== '/') {
                $requestUri = preg_replace('/^(http|https):\/\/[^\/]+/i', '', $requestUri);
            }
        } elseif (isset($_SERVER['ORIG_PATH_INFO'])) { // IIS 5.0 CGI
            $requestUri = $_SERVER['ORIG_PATH_INFO'];
            if (!empty($_SERVER['QUERY_STRING'])) {
                $requestUri .= '?' . $_SERVER['QUERY_STRING'];
            }
        } else {
            throw new InvalidConfigException('Unable to determine the request URI.');
        }

        return $requestUri;
    }

    /**
     * Returns part of the request URL that is after the question mark.
     * @return string part of the request URL that is after the question mark
     */
    public function getQueryString()
    {
        return isset($_SERVER['QUERY_STRING']) ? $_SERVER['QUERY_STRING'] : '';
    }

    /**
     * Return if the request is sent via secure channel (https).
     * @return boolean if the request is sent via secure channel (https)
     */
    public function getIsSecureConnection()
    {
        return isset($_SERVER['HTTPS']) && (strcasecmp($_SERVER['HTTPS'], 'on') === 0 || $_SERVER['HTTPS'] == 1)
            || isset($_SERVER['HTTP_X_FORWARDED_PROTO']) && strcasecmp($_SERVER['HTTP_X_FORWARDED_PROTO'], 'https') === 0;
    }

    /**
     * Returns the server name.
     * @return string server name
     */
    public function getServerName()
    {
        return $_SERVER['SERVER_NAME'];
    }

    /**
     * Returns the server port number.
     * @return integer server port number
     */
    public function getServerPort()
    {
        return (int) $_SERVER['SERVER_PORT'];
    }

    /**
     * Returns the URL referrer, null if not present
     * @return string URL referrer, null if not present
     */
    public function getReferrer()
    {
        return isset($_SERVER['HTTP_REFERER']) ? $_SERVER['HTTP_REFERER'] : null;
    }

    /**
     * Returns the user agent, null if not present.
     * @return string user agent, null if not present
     */
    public function getUserAgent()
    {
        return isset($_SERVER['HTTP_USER_AGENT']) ? $_SERVER['HTTP_USER_AGENT'] : null;
    }

    /**
     * Returns the user IP address.
845
     * @return string user IP address. Null is returned if the user IP address cannot be detected.
846 847 848
     */
    public function getUserIP()
    {
849
        return isset($_SERVER['REMOTE_ADDR']) ? $_SERVER['REMOTE_ADDR'] : null;
850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959
    }

    /**
     * Returns the user host name, null if it cannot be determined.
     * @return string user host name, null if cannot be determined
     */
    public function getUserHost()
    {
        return isset($_SERVER['REMOTE_HOST']) ? $_SERVER['REMOTE_HOST'] : null;
    }

    /**
     * @return string the username sent via HTTP authentication, null if the username is not given
     */
    public function getAuthUser()
    {
        return isset($_SERVER['PHP_AUTH_USER']) ? $_SERVER['PHP_AUTH_USER'] : null;
    }

    /**
     * @return string the password sent via HTTP authentication, null if the password is not given
     */
    public function getAuthPassword()
    {
        return isset($_SERVER['PHP_AUTH_PW']) ? $_SERVER['PHP_AUTH_PW'] : null;
    }

    private $_port;

    /**
     * Returns the port to use for insecure requests.
     * Defaults to 80, or the port specified by the server if the current
     * request is insecure.
     * @return integer port number for insecure requests.
     * @see setPort()
     */
    public function getPort()
    {
        if ($this->_port === null) {
            $this->_port = !$this->getIsSecureConnection() && isset($_SERVER['SERVER_PORT']) ? (int) $_SERVER['SERVER_PORT'] : 80;
        }

        return $this->_port;
    }

    /**
     * Sets the port to use for insecure requests.
     * This setter is provided in case a custom port is necessary for certain
     * server configurations.
     * @param integer $value port number.
     */
    public function setPort($value)
    {
        if ($value != $this->_port) {
            $this->_port = (int) $value;
            $this->_hostInfo = null;
        }
    }

    private $_securePort;

    /**
     * Returns the port to use for secure requests.
     * Defaults to 443, or the port specified by the server if the current
     * request is secure.
     * @return integer port number for secure requests.
     * @see setSecurePort()
     */
    public function getSecurePort()
    {
        if ($this->_securePort === null) {
            $this->_securePort = $this->getIsSecureConnection() && isset($_SERVER['SERVER_PORT']) ? (int) $_SERVER['SERVER_PORT'] : 443;
        }

        return $this->_securePort;
    }

    /**
     * Sets the port to use for secure requests.
     * This setter is provided in case a custom port is necessary for certain
     * server configurations.
     * @param integer $value port number.
     */
    public function setSecurePort($value)
    {
        if ($value != $this->_securePort) {
            $this->_securePort = (int) $value;
            $this->_hostInfo = null;
        }
    }

    private $_contentTypes;

    /**
     * Returns the content types acceptable by the end user.
     * This is determined by the `Accept` HTTP header. For example,
     *
     * ```php
     * $_SERVER['HTTP_ACCEPT'] = 'text/plain; q=0.5, application/json; version=1.0, application/xml; version=2.0;';
     * $types = $request->getAcceptableContentTypes();
     * print_r($types);
     * // displays:
     * // [
     * //     'application/json' => ['q' => 1, 'version' => '1.0'],
     * //      'application/xml' => ['q' => 1, 'version' => '2.0'],
     * //           'text/plain' => ['q' => 0.5],
     * // ]
     * ```
     *
     * @return array the content types ordered by the quality score. Types with the highest scores
960 961
     * will be returned first. The array keys are the content types, while the array values
     * are the corresponding quality score and other parameters as given in the header.
962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979
     */
    public function getAcceptableContentTypes()
    {
        if ($this->_contentTypes === null) {
            if (isset($_SERVER['HTTP_ACCEPT'])) {
                $this->_contentTypes = $this->parseAcceptHeader($_SERVER['HTTP_ACCEPT']);
            } else {
                $this->_contentTypes = [];
            }
        }

        return $this->_contentTypes;
    }

    /**
     * Sets the acceptable content types.
     * Please refer to [[getAcceptableContentTypes()]] on the format of the parameter.
     * @param array $value the content types that are acceptable by the end user. They should
980
     * be ordered by the preference level.
981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996
     * @see getAcceptableContentTypes()
     * @see parseAcceptHeader()
     */
    public function setAcceptableContentTypes($value)
    {
        $this->_contentTypes = $value;
    }

    /**
     * Returns request content-type
     * The Content-Type header field indicates the MIME type of the data
     * contained in [[getRawBody()]] or, in the case of the HEAD method, the
     * media type that would have been sent had the request been a GET.
     * For the MIME-types the user expects in response, see [[acceptableContentTypes]].
     * @return string request content-type. Null is returned if this information is not available.
     * @link http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.17
997
     * HTTP 1.1 header field definitions
998 999 1000 1001 1002
     */
    public function getContentType()
    {
        if (isset($_SERVER["CONTENT_TYPE"])) {
            return $_SERVER["CONTENT_TYPE"];
1003 1004
        } elseif (isset($_SERVER["HTTP_CONTENT_TYPE"])) {
            //fix bug https://bugs.php.net/bug.php?id=66606
1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016
            return $_SERVER["HTTP_CONTENT_TYPE"];
        }

        return null;
    }

    private $_languages;

    /**
     * Returns the languages acceptable by the end user.
     * This is determined by the `Accept-Language` HTTP header.
     * @return array the languages ordered by the preference level. The first element
1017
     * represents the most preferred language.
1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033
     */
    public function getAcceptableLanguages()
    {
        if ($this->_languages === null) {
            if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])) {
                $this->_languages = array_keys($this->parseAcceptHeader($_SERVER['HTTP_ACCEPT_LANGUAGE']));
            } else {
                $this->_languages = [];
            }
        }

        return $this->_languages;
    }

    /**
     * @param array $value the languages that are acceptable by the end user. They should
1034
     * be ordered by the preference level.
1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060
     */
    public function setAcceptableLanguages($value)
    {
        $this->_languages = $value;
    }

    /**
     * Parses the given `Accept` (or `Accept-Language`) header.
     *
     * This method will return the acceptable values with their quality scores and the corresponding parameters
     * as specified in the given `Accept` header. The array keys of the return value are the acceptable values,
     * while the array values consisting of the corresponding quality scores and parameters. The acceptable
     * values with the highest quality scores will be returned first. For example,
     *
     * ```php
     * $header = 'text/plain; q=0.5, application/json; version=1.0, application/xml; version=2.0;';
     * $accepts = $request->parseAcceptHeader($header);
     * print_r($accepts);
     * // displays:
     * // [
     * //     'application/json' => ['q' => 1, 'version' => '1.0'],
     * //      'application/xml' => ['q' => 1, 'version' => '2.0'],
     * //           'text/plain' => ['q' => 0.5],
     * // ]
     * ```
     *
1061 1062 1063
     * @param string $header the header to be parsed
     * @return array the acceptable values ordered by their quality score. The values with the highest scores
     * will be returned first.
1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128
     */
    public function parseAcceptHeader($header)
    {
        $accepts = [];
        foreach (explode(',', $header) as $i => $part) {
            $params = preg_split('/\s*;\s*/', trim($part), -1, PREG_SPLIT_NO_EMPTY);
            if (empty($params)) {
                continue;
            }
            $values = [
                'q' => [$i, array_shift($params), 1],
            ];
            foreach ($params as $param) {
                if (strpos($param, '=') !== false) {
                    list ($key, $value) = explode('=', $param, 2);
                    if ($key === 'q') {
                        $values['q'][2] = (double) $value;
                    } else {
                        $values[$key] = $value;
                    }
                } else {
                    $values[] = $param;
                }
            }
            $accepts[] = $values;
        }

        usort($accepts, function ($a, $b) {
            $a = $a['q']; // index, name, q
            $b = $b['q'];
            if ($a[2] > $b[2]) {
                return -1;
            } elseif ($a[2] < $b[2]) {
                return 1;
            } elseif ($a[1] === $b[1]) {
                return $a[0] > $b[0] ? 1 : -1;
            } elseif ($a[1] === '*/*') {
                return 1;
            } elseif ($b[1] === '*/*') {
                return -1;
            } else {
                $wa = $a[1][strlen($a[1]) - 1] === '*';
                $wb = $b[1][strlen($b[1]) - 1] === '*';
                if ($wa xor $wb) {
                    return $wa ? 1 : -1;
                } else {
                    return $a[0] > $b[0] ? 1 : -1;
                }
            }
        });

        $result = [];
        foreach ($accepts as $accept) {
            $name = $accept['q'][1];
            $accept['q'] = $accept['q'][2];
            $result[$name] = $accept;
        }

        return $result;
    }

    /**
     * Returns the user-preferred language that should be used by this application.
     * The language resolution is based on the user preferred languages and the languages
     * supported by the application. The method will try to find the best match.
1129 1130
     * @param array $languages a list of the languages supported by the application. If this is empty, the current
     * application language will be returned without further processing.
1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151
     * @return string the language that the application should use.
     */
    public function getPreferredLanguage(array $languages = [])
    {
        if (empty($languages)) {
            return Yii::$app->language;
        }
        foreach ($this->getAcceptableLanguages() as $acceptableLanguage) {
            $acceptableLanguage = str_replace('_', '-', strtolower($acceptableLanguage));
            foreach ($languages as $language) {
                $language = str_replace('_', '-', strtolower($language));
                // en-us==en-us, en==en-us, en-us==en
                if ($language === $acceptableLanguage || strpos($acceptableLanguage, $language . '-') === 0 || strpos($language, $acceptableLanguage . '-') === 0) {
                    return $language;
                }
            }
        }

        return reset($languages);
    }

1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165
    /**
     * Gets the Etags.
     *
     * @return array The entity tags
     */
    public function getETags()
    {
        if (isset($_SERVER['HTTP_IF_NONE_MATCH'])) {
            return preg_split('/[\s,]+/', $_SERVER['HTTP_IF_NONE_MATCH'], -1, PREG_SPLIT_NO_EMPTY);
        } else {
            return [];
        }
    }

1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195
    /**
     * Returns the cookie collection.
     * Through the returned cookie collection, you may access a cookie using the following syntax:
     *
     * ~~~
     * $cookie = $request->cookies['name']
     * if ($cookie !== null) {
     *     $value = $cookie->value;
     * }
     *
     * // alternatively
     * $value = $request->cookies->getValue('name');
     * ~~~
     *
     * @return CookieCollection the cookie collection.
     */
    public function getCookies()
    {
        if ($this->_cookies === null) {
            $this->_cookies = new CookieCollection($this->loadCookies(), [
                'readOnly' => true,
            ]);
        }

        return $this->_cookies;
    }

    /**
     * Converts `$_COOKIE` into an array of [[Cookie]].
     * @return array the cookies obtained from request
1196
     * @throws InvalidConfigException if [[cookieValidationKey]] is not set when [[enableCookieValidation]] is true
1197 1198 1199 1200 1201
     */
    protected function loadCookies()
    {
        $cookies = [];
        if ($this->enableCookieValidation) {
1202 1203 1204
            if ($this->cookieValidationKey == '') {
                throw new InvalidConfigException(get_class($this) . '::cookieValidationKey must be configured with a secret key.');
            }
1205
            foreach ($_COOKIE as $name => $value) {
1206
                if (is_string($value) && ($value = Yii::$app->getSecurity()->validateData($value, $this->cookieValidationKey)) !== false) {
1207 1208 1209
                    $cookies[$name] = new Cookie([
                        'name' => $name,
                        'value' => @unserialize($value),
SonicGD committed
1210
                        'expire'=> null
1211 1212 1213 1214 1215 1216 1217 1218
                    ]);
                }
            }
        } else {
            foreach ($_COOKIE as $name => $value) {
                $cookies[$name] = new Cookie([
                    'name' => $name,
                    'value' => $value,
SonicGD committed
1219
                    'expire'=> null
1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241
                ]);
            }
        }

        return $cookies;
    }

    /**
     * @var Cookie
     */
    private $_csrfCookie;

    /**
     * Returns the unmasked random token used to perform CSRF validation.
     * This token is typically sent via a cookie. If such a cookie does not exist, a new token will be generated.
     * @return string the random token for CSRF validation.
     * @see enableCsrfValidation
     */
    public function getRawCsrfToken()
    {
        if ($this->_csrfCookie === null) {
            $this->_csrfCookie = $this->getCookies()->get($this->csrfParam);
1242
            if ($this->_csrfCookie === null || empty($this->_csrfCookie->value)) {
1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278
                $this->_csrfCookie = $this->createCsrfCookie();
                Yii::$app->getResponse()->getCookies()->add($this->_csrfCookie);
            }
        }
        return $this->_csrfCookie->value;
    }

    private $_csrfToken;

    /**
     * Returns the token used to perform CSRF validation.
     *
     * This token is a masked version of [[rawCsrfToken]] to prevent [BREACH attacks](http://breachattack.com/).
     * This token may be passed along via a hidden field of an HTML form or an HTTP header value
     * to support CSRF validation.
     *
     * @return string the token used to perform CSRF validation.
     */
    public function getCsrfToken()
    {
        if ($this->_csrfToken === null) {
            // the mask doesn't need to be very random
            $chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_-.';
            $mask = substr(str_shuffle(str_repeat($chars, 5)), 0, self::CSRF_MASK_LENGTH);

            $token = $this->getRawCsrfToken();
            // The + sign may be decoded as blank space later, which will fail the validation
            $this->_csrfToken = str_replace('+', '.', base64_encode($mask . $this->xorTokens($token, $mask)));
        }

        return $this->_csrfToken;
    }

    /**
     * Returns the XOR result of two strings.
     * If the two strings are of different lengths, the shorter one will be padded to the length of the longer one.
1279 1280
     * @param string $token1
     * @param string $token2
1281 1282 1283 1284 1285 1286 1287 1288 1289
     * @return string the XOR result
     */
    private function xorTokens($token1, $token2)
    {
        $n1 = StringHelper::byteLength($token1);
        $n2 = StringHelper::byteLength($token2);
        if ($n1 > $n2) {
            $token2 = str_pad($token2, $n1, $token2);
        } elseif ($n1 < $n2) {
1290
            $token1 = str_pad($token1, $n2, $n1 === 0 ? ' ' : $token1);
1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314
        }

        return $token1 ^ $token2;
    }

    /**
     * @return string the CSRF token sent via [[CSRF_HEADER]] by browser. Null is returned if no such header is sent.
     */
    public function getCsrfTokenFromHeader()
    {
        $key = 'HTTP_' . str_replace('-', '_', strtoupper(self::CSRF_HEADER));
        return isset($_SERVER[$key]) ? $_SERVER[$key] : null;
    }

    /**
     * Creates a cookie with a randomly generated CSRF token.
     * Initial values specified in [[csrfCookie]] will be applied to the generated cookie.
     * @return Cookie the generated cookie
     * @see enableCsrfValidation
     */
    protected function createCsrfCookie()
    {
        $options = $this->csrfCookie;
        $options['name'] = $this->csrfParam;
1315
        $options['value'] = Yii::$app->getSecurity()->generateRandomString();
1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339
        return new Cookie($options);
    }

    /**
     * Performs the CSRF validation.
     * The method will compare the CSRF token obtained from a cookie and from a POST field.
     * If they are different, a CSRF attack is detected and a 400 HTTP exception will be raised.
     * This method is called in [[Controller::beforeAction()]].
     * @return boolean whether CSRF token is valid. If [[enableCsrfValidation]] is false, this method will return true.
     */
    public function validateCsrfToken()
    {
        $method = $this->getMethod();
        // only validate CSRF token on non-"safe" methods http://www.w3.org/Protocols/rfc2616/rfc2616-sec9.html#sec9.1.1
        if (!$this->enableCsrfValidation || in_array($method, ['GET', 'HEAD', 'OPTIONS'], true)) {
            return true;
        }
        $trueToken = $this->getCookies()->getValue($this->csrfParam);
        $token = $this->getBodyParam($this->csrfParam);

        return $this->validateCsrfTokenInternal($token, $trueToken)
            || $this->validateCsrfTokenInternal($this->getCsrfTokenFromHeader(), $trueToken);
    }

1340 1341 1342 1343 1344 1345 1346
    /**
     * Validates CSRF token
     *
     * @param string $token
     * @param string $trueToken
     * @return boolean
     */
1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359
    private function validateCsrfTokenInternal($token, $trueToken)
    {
        $token = base64_decode(str_replace('.', '+', $token));
        $n = StringHelper::byteLength($token);
        if ($n <= self::CSRF_MASK_LENGTH) {
            return false;
        }
        $mask = StringHelper::byteSubstr($token, 0, self::CSRF_MASK_LENGTH);
        $token = StringHelper::byteSubstr($token, self::CSRF_MASK_LENGTH, $n - self::CSRF_MASK_LENGTH);
        $token = $this->xorTokens($mask, $token);

        return $token === $trueToken;
    }
Qiang Xue committed
1360
}