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Source: /plugins/twitter_plugin/twitteroauth/oauth.php - 876 lines - 26235 bytes - Summary - Text - Print

   1  <?php
   2  
   3  if( !defined('EVO_MAIN_INIT') ) die( 'Please, do not access this page directly.' );
   4  
   5  /*
   6   * Generic exception class
   7   */
   8  class OAuthException extends Exception {
   9    // pass
  10  }
  11  
  12  class OAuthConsumer {
  13    public $key;
  14    public $secret;
  15  
  16    function __construct($key, $secret, $callback_url=NULL) {
  17      $this->key = $key;
  18      $this->secret = $secret;
  19      $this->callback_url = $callback_url;
  20    }
  21  
  22    function __toString() {
  23      return "OAuthConsumer[key=$this->key,secret=$this->secret]";
  24    }
  25  }
  26  
  27  class OAuthToken {
  28    // access tokens and request tokens
  29    public $key;
  30    public $secret;
  31  
  32    /**
  33  * key = the token
  34  * secret = the token secret
  35  */
  36    function __construct($key, $secret) {
  37      $this->key = $key;
  38      $this->secret = $secret;
  39    }
  40  
  41    /**
  42  * generates the basic string serialization of a token that a server
  43  * would respond to request_token and access_token calls with
  44  */
  45    function to_string() {
  46      return "oauth_token=" .
  47             OAuthUtil::urlencode_rfc3986($this->key) .
  48             "&oauth_token_secret=" .
  49             OAuthUtil::urlencode_rfc3986($this->secret);
  50    }
  51  
  52    function __toString() {
  53      return $this->to_string();
  54    }
  55  }
  56  
  57  /**
  58  * A class for implementing a Signature Method
  59  * See section 9 ("Signing Requests") in the spec
  60  */
  61  abstract class OAuthSignatureMethod {
  62    /**
  63  * Needs to return the name of the Signature Method (ie HMAC-SHA1)
  64  * @return string
  65  */
  66    abstract public function get_name();
  67  
  68    /**
  69  * Build up the signature
  70  * NOTE: The output of this function MUST NOT be urlencoded.
  71  * the encoding is handled in OAuthRequest when the final
  72  * request is serialized
  73  * @param OAuthRequest $request
  74  * @param OAuthConsumer $consumer
  75  * @param OAuthToken $token
  76  * @return string
  77  */
  78    abstract public function build_signature($request, $consumer, $token);
  79  
  80    /**
  81  * Verifies that a given signature is correct
  82  * @param OAuthRequest $request
  83  * @param OAuthConsumer $consumer
  84  * @param OAuthToken $token
  85  * @param string $signature
  86  * @return bool
  87  */
  88    public function check_signature($request, $consumer, $token, $signature) {
  89      $built = $this->build_signature($request, $consumer, $token);
  90      return $built == $signature;
  91    }
  92  }
  93  
  94  /**
  95  * The HMAC-SHA1 signature method uses the HMAC-SHA1 signature algorithm as defined in [RFC2104]
  96  * where the Signature Base String is the text and the key is the concatenated values (each first
  97  * encoded per Parameter Encoding) of the Consumer Secret and Token Secret, separated by an '&'
  98  * character (ASCII code 38) even if empty.
  99  * - Chapter 9.2 ("HMAC-SHA1")
 100  */
 101  class OAuthSignatureMethod_HMAC_SHA1 extends OAuthSignatureMethod {
 102    function get_name() {
 103      return "HMAC-SHA1";
 104    }
 105  
 106    public function build_signature($request, $consumer, $token) {
 107      $base_string = $request->get_signature_base_string();
 108      $request->base_string = $base_string;
 109  
 110      $key_parts = array(
 111        $consumer->secret,
 112        ($token) ? $token->secret : ""
 113      );
 114  
 115      $key_parts = OAuthUtil::urlencode_rfc3986($key_parts);
 116      $key = implode('&', $key_parts);
 117  
 118      return base64_encode(hash_hmac('sha1', $base_string, $key, true));
 119    }
 120  }
 121  
 122  /**
 123  * The PLAINTEXT method does not provide any security protection and SHOULD only be used
 124  * over a secure channel such as HTTPS. It does not use the Signature Base String.
 125  * - Chapter 9.4 ("PLAINTEXT")
 126  */
 127  class OAuthSignatureMethod_PLAINTEXT extends OAuthSignatureMethod {
 128    public function get_name() {
 129      return "PLAINTEXT";
 130    }
 131  
 132    /**
 133  * oauth_signature is set to the concatenated encoded values of the Consumer Secret and
 134  * Token Secret, separated by a '&' character (ASCII code 38), even if either secret is
 135  * empty. The result MUST be encoded again.
 136  * - Chapter 9.4.1 ("Generating Signatures")
 137  *
 138  * Please note that the second encoding MUST NOT happen in the SignatureMethod, as
 139  * OAuthRequest handles this!
 140  */
 141    public function build_signature($request, $consumer, $token) {
 142      $key_parts = array(
 143        $consumer->secret,
 144        ($token) ? $token->secret : ""
 145      );
 146  
 147      $key_parts = OAuthUtil::urlencode_rfc3986($key_parts);
 148      $key = implode('&', $key_parts);
 149      $request->base_string = $key;
 150  
 151      return $key;
 152    }
 153  }
 154  
 155  /**
 156  * The RSA-SHA1 signature method uses the RSASSA-PKCS1-v1_5 signature algorithm as defined in
 157  * [RFC3447] section 8.2 (more simply known as PKCS#1), using SHA-1 as the hash function for
 158  * EMSA-PKCS1-v1_5. It is assumed that the Consumer has provided its RSA public key in a
 159  * verified way to the Service Provider, in a manner which is beyond the scope of this
 160  * specification.
 161  * - Chapter 9.3 ("RSA-SHA1")
 162  */
 163  abstract class OAuthSignatureMethod_RSA_SHA1 extends OAuthSignatureMethod {
 164    public function get_name() {
 165      return "RSA-SHA1";
 166    }
 167  
 168    // Up to the SP to implement this lookup of keys. Possible ideas are:
 169    // (1) do a lookup in a table of trusted certs keyed off of consumer
 170    // (2) fetch via http using a url provided by the requester
 171    // (3) some sort of specific discovery code based on request
 172    //
 173    // Either way should return a string representation of the certificate
 174    protected abstract function fetch_public_cert(&$request);
 175  
 176    // Up to the SP to implement this lookup of keys. Possible ideas are:
 177    // (1) do a lookup in a table of trusted certs keyed off of consumer
 178    //
 179    // Either way should return a string representation of the certificate
 180    protected abstract function fetch_private_cert(&$request);
 181  
 182    public function build_signature($request, $consumer, $token) {
 183      $base_string = $request->get_signature_base_string();
 184      $request->base_string = $base_string;
 185  
 186      // Fetch the private key cert based on the request
 187      $cert = $this->fetch_private_cert($request);
 188  
 189      // Pull the private key ID from the certificate
 190      $privatekeyid = openssl_get_privatekey($cert);
 191  
 192      // Sign using the key
 193      $ok = openssl_sign($base_string, $signature, $privatekeyid);
 194  
 195      // Release the key resource
 196      openssl_free_key($privatekeyid);
 197  
 198      return base64_encode($signature);
 199    }
 200  
 201    public function check_signature($request, $consumer, $token, $signature) {
 202      $decoded_sig = base64_decode($signature);
 203  
 204      $base_string = $request->get_signature_base_string();
 205  
 206      // Fetch the public key cert based on the request
 207      $cert = $this->fetch_public_cert($request);
 208  
 209      // Pull the public key ID from the certificate
 210      $publickeyid = openssl_get_publickey($cert);
 211  
 212      // Check the computed signature against the one passed in the query
 213      $ok = openssl_verify($base_string, $decoded_sig, $publickeyid);
 214  
 215      // Release the key resource
 216      openssl_free_key($publickeyid);
 217  
 218      return $ok == 1;
 219    }
 220  }
 221  
 222  class OAuthRequest {
 223    private $parameters;
 224    private $http_method;
 225    private $http_url;
 226    // for debug purposes
 227    public $base_string;
 228    public static $version = '1.0';
 229    public static $POST_INPUT = 'php://input';
 230  
 231    function __construct($http_method, $http_url, $parameters=NULL) {
 232      @$parameters or $parameters = array();
 233      $parameters = array_merge( OAuthUtil::parse_parameters(parse_url($http_url, PHP_URL_QUERY)), $parameters);
 234      $this->parameters = $parameters;
 235      $this->http_method = $http_method;
 236      $this->http_url = $http_url;
 237    }
 238  
 239  
 240    /**
 241  * attempt to build up a request from what was passed to the server
 242  */
 243    public static function from_request($http_method=NULL, $http_url=NULL, $parameters=NULL) {
 244      $scheme = (!isset($_SERVER['HTTPS']) || $_SERVER['HTTPS'] != "on")
 245                ? 'http'
 246                : 'https';
 247      @$http_url or $http_url = $scheme .
 248                                '://' . $_SERVER['HTTP_HOST'] .
 249                                ':' .
 250                                $_SERVER['SERVER_PORT'] .
 251                                $_SERVER['REQUEST_URI'];
 252      @$http_method or $http_method = $_SERVER['REQUEST_METHOD'];
 253  
 254      // We weren't handed any parameters, so let's find the ones relevant to
 255      // this request.
 256      // If you run XML-RPC or similar you should use this to provide your own
 257      // parsed parameter-list
 258      if (!$parameters) {
 259        // Find request headers
 260        $request_headers = OAuthUtil::get_headers();
 261  
 262        // Parse the query-string to find GET parameters
 263        $parameters = OAuthUtil::parse_parameters($_SERVER['QUERY_STRING']);
 264  
 265        // It's a POST request of the proper content-type, so parse POST
 266        // parameters and add those overriding any duplicates from GET
 267        if ($http_method == "POST"
 268            && @strstr($request_headers["Content-Type"],
 269                       "application/x-www-form-urlencoded")
 270            ) {
 271          $post_data = OAuthUtil::parse_parameters(
 272            file_get_contents(self::$POST_INPUT)
 273          );
 274          $parameters = array_merge($parameters, $post_data);
 275        }
 276  
 277        // We have a Authorization-header with OAuth data. Parse the header
 278        // and add those overriding any duplicates from GET or POST
 279        if (@substr($request_headers['Authorization'], 0, 6) == "OAuth ") {
 280          $header_parameters = OAuthUtil::split_header(
 281            $request_headers['Authorization']
 282          );
 283          $parameters = array_merge($parameters, $header_parameters);
 284        }
 285  
 286      }
 287  
 288      return new OAuthRequest($http_method, $http_url, $parameters);
 289    }
 290  
 291    /**
 292  * pretty much a helper function to set up the request
 293  */
 294    public static function from_consumer_and_token($consumer, $token, $http_method, $http_url, $parameters=NULL) {
 295      @$parameters or $parameters = array();
 296      $defaults = array("oauth_version" => OAuthRequest::$version,
 297                        "oauth_nonce" => OAuthRequest::generate_nonce(),
 298                        "oauth_timestamp" => OAuthRequest::generate_timestamp(),
 299                        "oauth_consumer_key" => $consumer->key);
 300      if ($token)
 301        $defaults['oauth_token'] = $token->key;
 302  
 303      $parameters = array_merge($defaults, $parameters);
 304  
 305      return new OAuthRequest($http_method, $http_url, $parameters);
 306    }
 307  
 308    public function set_parameter($name, $value, $allow_duplicates = true) {
 309      if ($allow_duplicates && isset($this->parameters[$name])) {
 310        // We have already added parameter(s) with this name, so add to the list
 311        if (is_scalar($this->parameters[$name])) {
 312          // This is the first duplicate, so transform scalar (string)
 313          // into an array so we can add the duplicates
 314          $this->parameters[$name] = array($this->parameters[$name]);
 315        }
 316  
 317        $this->parameters[$name][] = $value;
 318      } else {
 319        $this->parameters[$name] = $value;
 320      }
 321    }
 322  
 323    public function get_parameter($name) {
 324      return isset($this->parameters[$name]) ? $this->parameters[$name] : null;
 325    }
 326  
 327    public function get_parameters() {
 328      return $this->parameters;
 329    }
 330  
 331    public function unset_parameter($name) {
 332      unset($this->parameters[$name]);
 333    }
 334  
 335    /**
 336  * The request parameters, sorted and concatenated into a normalized string.
 337  * @return string
 338  */
 339    public function get_signable_parameters() {
 340      // Grab all parameters
 341      $params = $this->parameters;
 342  
 343      // Remove oauth_signature if present
 344      // Ref: Spec: 9.1.1 ("The oauth_signature parameter MUST be excluded.")
 345      if (isset($params['oauth_signature'])) {
 346        unset($params['oauth_signature']);
 347      }
 348  
 349      return OAuthUtil::build_http_query($params);
 350    }
 351  
 352    /**
 353  * Returns the base string of this request
 354  *
 355  * The base string defined as the method, the url
 356  * and the parameters (normalized), each urlencoded
 357  * and the concated with &.
 358  */
 359    public function get_signature_base_string() {
 360      $parts = array(
 361        $this->get_normalized_http_method(),
 362        $this->get_normalized_http_url(),
 363        $this->get_signable_parameters()
 364      );
 365  
 366      $parts = OAuthUtil::urlencode_rfc3986($parts);
 367  
 368      return implode('&', $parts);
 369    }
 370  
 371    /**
 372  * just uppercases the http method
 373  */
 374    public function get_normalized_http_method() {
 375      return strtoupper($this->http_method);
 376    }
 377  
 378    /**
 379  * parses the url and rebuilds it to be
 380  * scheme://host/path
 381  */
 382    public function get_normalized_http_url() {
 383      $parts = parse_url($this->http_url);
 384  
 385      $port = @$parts['port'];
 386      $scheme = $parts['scheme'];
 387      $host = $parts['host'];
 388      $path = @$parts['path'];
 389  
 390      $port or $port = ($scheme == 'https') ? '443' : '80';
 391  
 392      if (($scheme == 'https' && $port != '443')
 393          || ($scheme == 'http' && $port != '80')) {
 394        $host = "$host:$port";
 395      }
 396      return "$scheme://$host$path";
 397    }
 398  
 399    /**
 400  * builds a url usable for a GET request
 401  */
 402    public function to_url() {
 403      $post_data = $this->to_postdata();
 404      $out = $this->get_normalized_http_url();
 405      if ($post_data) {
 406        $out .= '?'.$post_data;
 407      }
 408      return $out;
 409    }
 410  
 411    /**
 412  * builds the data one would send in a POST request
 413  */
 414    public function to_postdata() {
 415      return OAuthUtil::build_http_query($this->parameters);
 416    }
 417  
 418    /**
 419  * builds the Authorization: header
 420  */
 421    public function to_header($realm=null) {
 422      $first = true;
 423  if($realm) {
 424        $out = 'Authorization: OAuth realm="' . OAuthUtil::urlencode_rfc3986($realm) . '"';
 425        $first = false;
 426      } else
 427        $out = 'Authorization: OAuth';
 428  
 429      $total = array();
 430      foreach ($this->parameters as $k => $v) {
 431        if (substr($k, 0, 5) != "oauth") continue;
 432        if (is_array($v)) {
 433          throw new OAuthException('Arrays not supported in headers');
 434        }
 435        $out .= ($first) ? ' ' : ',';
 436        $out .= OAuthUtil::urlencode_rfc3986($k) .
 437                '="' .
 438                OAuthUtil::urlencode_rfc3986($v) .
 439                '"';
 440        $first = false;
 441      }
 442      return $out;
 443    }
 444  
 445    public function __toString() {
 446      return $this->to_url();
 447    }
 448  
 449  
 450    public function sign_request($signature_method, $consumer, $token) {
 451      $this->set_parameter(
 452        "oauth_signature_method",
 453        $signature_method->get_name(),
 454        false
 455      );
 456      $signature = $this->build_signature($signature_method, $consumer, $token);
 457      $this->set_parameter("oauth_signature", $signature, false);
 458    }
 459  
 460    public function build_signature($signature_method, $consumer, $token) {
 461      $signature = $signature_method->build_signature($this, $consumer, $token);
 462      return $signature;
 463    }
 464  
 465    /**
 466  * util function: current timestamp
 467  */
 468    private static function generate_timestamp() {
 469      return time();
 470    }
 471  
 472    /**
 473  * util function: current nonce
 474  */
 475    private static function generate_nonce() {
 476      $mt = microtime();
 477      $rand = mt_rand();
 478  
 479      return md5($mt . $rand); // md5s look nicer than numbers
 480    }
 481  }
 482  
 483  class OAuthServer {
 484    protected $timestamp_threshold = 300; // in seconds, five minutes
 485    protected $version = '1.0'; // hi blaine
 486    protected $signature_methods = array();
 487  
 488    protected $data_store;
 489  
 490    function __construct($data_store) {
 491      $this->data_store = $data_store;
 492    }
 493  
 494    public function add_signature_method($signature_method) {
 495      $this->signature_methods[$signature_method->get_name()] =
 496        $signature_method;
 497    }
 498  
 499    // high level functions
 500  
 501    /**
 502  * process a request_token request
 503  * returns the request token on success
 504  */
 505    public function fetch_request_token(&$request) {
 506      $this->get_version($request);
 507  
 508      $consumer = $this->get_consumer($request);
 509  
 510      // no token required for the initial token request
 511      $token = NULL;
 512  
 513      $this->check_signature($request, $consumer, $token);
 514  
 515      // Rev A change
 516      $callback = $request->get_parameter('oauth_callback');
 517      $new_token = $this->data_store->new_request_token($consumer, $callback);
 518  
 519      return $new_token;
 520    }
 521  
 522    /**
 523  * process an access_token request
 524  * returns the access token on success
 525  */
 526    public function fetch_access_token(&$request) {
 527      $this->get_version($request);
 528  
 529      $consumer = $this->get_consumer($request);
 530  
 531      // requires authorized request token
 532      $token = $this->get_token($request, $consumer, "request");
 533  
 534      $this->check_signature($request, $consumer, $token);
 535  
 536      // Rev A change
 537      $verifier = $request->get_parameter('oauth_verifier');
 538      $new_token = $this->data_store->new_access_token($token, $consumer, $verifier);
 539  
 540      return $new_token;
 541    }
 542  
 543    /**
 544  * verify an api call, checks all the parameters
 545  */
 546    public function verify_request(&$request) {
 547      $this->get_version($request);
 548      $consumer = $this->get_consumer($request);
 549      $token = $this->get_token($request, $consumer, "access");
 550      $this->check_signature($request, $consumer, $token);
 551      return array($consumer, $token);
 552    }
 553  
 554    // Internals from here
 555    /**
 556  * version 1
 557  */
 558    private function get_version(&$request) {
 559      $version = $request->get_parameter("oauth_version");
 560      if (!$version) {
 561        // Service Providers MUST assume the protocol version to be 1.0 if this parameter is not present.
 562        // Chapter 7.0 ("Accessing Protected Ressources")
 563        $version = '1.0';
 564      }
 565      if ($version !== $this->version) {
 566        throw new OAuthException("OAuth version '$version' not supported");
 567      }
 568      return $version;
 569    }
 570  
 571    /**
 572  * figure out the signature with some defaults
 573  */
 574    private function get_signature_method(&$request) {
 575      $signature_method =
 576          @$request->get_parameter("oauth_signature_method");
 577  
 578      if (!$signature_method) {
 579        // According to chapter 7 ("Accessing Protected Ressources") the signature-method
 580        // parameter is required, and we can't just fallback to PLAINTEXT
 581        throw new OAuthException('No signature method parameter. This parameter is required');
 582      }
 583  
 584      if (!in_array($signature_method,
 585                    array_keys($this->signature_methods))) {
 586        throw new OAuthException(
 587          "Signature method '$signature_method' not supported " .
 588          "try one of the following: " .
 589          implode(", ", array_keys($this->signature_methods))
 590        );
 591      }
 592      return $this->signature_methods[$signature_method];
 593    }
 594  
 595    /**
 596  * try to find the consumer for the provided request's consumer key
 597  */
 598    private function get_consumer(&$request) {
 599      $consumer_key = @$request->get_parameter("oauth_consumer_key");
 600      if (!$consumer_key) {
 601        throw new OAuthException("Invalid consumer key");
 602      }
 603  
 604      $consumer = $this->data_store->lookup_consumer($consumer_key);
 605      if (!$consumer) {
 606        throw new OAuthException("Invalid consumer");
 607      }
 608  
 609      return $consumer;
 610    }
 611  
 612    /**
 613  * try to find the token for the provided request's token key
 614  */
 615    private function get_token(&$request, $consumer, $token_type="access") {
 616      $token_field = @$request->get_parameter('oauth_token');
 617      $token = $this->data_store->lookup_token(
 618        $consumer, $token_type, $token_field
 619      );
 620      if (!$token) {
 621        throw new OAuthException("Invalid $token_type token: $token_field");
 622      }
 623      return $token;
 624    }
 625  
 626    /**
 627  * all-in-one function to check the signature on a request
 628  * should guess the signature method appropriately
 629  */
 630    private function check_signature(&$request, $consumer, $token) {
 631      // this should probably be in a different method
 632      $timestamp = @$request->get_parameter('oauth_timestamp');
 633      $nonce = @$request->get_parameter('oauth_nonce');
 634  
 635      $this->check_timestamp($timestamp);
 636      $this->check_nonce($consumer, $token, $nonce, $timestamp);
 637  
 638      $signature_method = $this->get_signature_method($request);
 639  
 640      $signature = $request->get_parameter('oauth_signature');
 641      $valid_sig = $signature_method->check_signature(
 642        $request,
 643        $consumer,
 644        $token,
 645        $signature
 646      );
 647  
 648      if (!$valid_sig) {
 649        throw new OAuthException("Invalid signature");
 650      }
 651    }
 652  
 653    /**
 654  * check that the timestamp is new enough
 655  */
 656    private function check_timestamp($timestamp) {
 657      if( ! $timestamp )
 658        throw new OAuthException(
 659          'Missing timestamp parameter. The parameter is required'
 660        );
 661  
 662      // verify that timestamp is recentish
 663      $now = time();
 664      if (abs($now - $timestamp) > $this->timestamp_threshold) {
 665        throw new OAuthException(
 666          "Expired timestamp, yours $timestamp, ours $now"
 667        );
 668      }
 669    }
 670  
 671    /**
 672  * check that the nonce is not repeated
 673  */
 674    private function check_nonce($consumer, $token, $nonce, $timestamp) {
 675      if( ! $nonce )
 676        throw new OAuthException(
 677          'Missing nonce parameter. The parameter is required'
 678        );
 679  
 680      // verify that the nonce is uniqueish
 681      $found = $this->data_store->lookup_nonce(
 682        $consumer,
 683        $token,
 684        $nonce,
 685        $timestamp
 686      );
 687      if ($found) {
 688        throw new OAuthException("Nonce already used: $nonce");
 689      }
 690    }
 691  
 692  }
 693  
 694  class OAuthDataStore {
 695    function lookup_consumer($consumer_key) {
 696      // implement me
 697    }
 698  
 699    function lookup_token($consumer, $token_type, $token) {
 700      // implement me
 701    }
 702  
 703    function lookup_nonce($consumer, $token, $nonce, $timestamp) {
 704      // implement me
 705    }
 706  
 707    function new_request_token($consumer, $callback = null) {
 708      // return a new token attached to this consumer
 709    }
 710  
 711    function new_access_token($token, $consumer, $verifier = null) {
 712      // return a new access token attached to this consumer
 713      // for the user associated with this token if the request token
 714      // is authorized
 715      // should also invalidate the request token
 716    }
 717  
 718  }
 719  
 720  class OAuthUtil {
 721    public static function urlencode_rfc3986($input) {
 722    if (is_array($input)) {
 723      return array_map(array('OAuthUtil', 'urlencode_rfc3986'), $input);
 724    } else if (is_scalar($input)) {
 725      return str_replace(
 726        '+',
 727        ' ',
 728        str_replace('%7E', '~', rawurlencode($input))
 729      );
 730    } else {
 731      return '';
 732    }
 733  }
 734  
 735  
 736    // This decode function isn't taking into consideration the above
 737    // modifications to the encoding process. However, this method doesn't
 738    // seem to be used anywhere so leaving it as is.
 739    public static function urldecode_rfc3986($string) {
 740      return urldecode($string);
 741    }
 742  
 743    // Utility function for turning the Authorization: header into
 744    // parameters, has to do some unescaping
 745    // Can filter out any non-oauth parameters if needed (default behaviour)
 746    public static function split_header($header, $only_allow_oauth_parameters = true) {
 747      $pattern = '/(([-_a-z]*)=("([^"]*)"|([^,]*)),?)/';
 748      $offset = 0;
 749      $params = array();
 750      while (preg_match($pattern, $header, $matches, PREG_OFFSET_CAPTURE, $offset) > 0) {
 751        $match = $matches[0];
 752        $header_name = $matches[2][0];
 753        $header_content = (isset($matches[5])) ? $matches[5][0] : $matches[4][0];
 754        if (preg_match('/^oauth_/', $header_name) || !$only_allow_oauth_parameters) {
 755          $params[$header_name] = OAuthUtil::urldecode_rfc3986($header_content);
 756        }
 757        $offset = $match[1] + strlen($match[0]);
 758      }
 759  
 760      if (isset($params['realm'])) {
 761        unset($params['realm']);
 762      }
 763  
 764      return $params;
 765    }
 766  
 767    // helper to try to sort out headers for people who aren't running apache
 768    public static function get_headers() {
 769      if (function_exists('apache_request_headers')) {
 770        // we need this to get the actual Authorization: header
 771        // because apache tends to tell us it doesn't exist
 772        $headers = apache_request_headers();
 773  
 774        // sanitize the output of apache_request_headers because
 775        // we always want the keys to be Cased-Like-This and arh()
 776        // returns the headers in the same case as they are in the
 777        // request
 778        $out = array();
 779        foreach( $headers AS $key => $value ) {
 780          $key = str_replace(
 781              " ",
 782              "-",
 783              ucwords(strtolower(str_replace("-", " ", $key)))
 784            );
 785          $out[$key] = $value;
 786        }
 787      } else {
 788        // otherwise we don't have apache and are just going to have to hope
 789        // that $_SERVER actually contains what we need
 790        $out = array();
 791        if( isset($_SERVER['CONTENT_TYPE']) )
 792          $out['Content-Type'] = $_SERVER['CONTENT_TYPE'];
 793        if( isset($_ENV['CONTENT_TYPE']) )
 794          $out['Content-Type'] = $_ENV['CONTENT_TYPE'];
 795  
 796        foreach ($_SERVER as $key => $value) {
 797          if (substr($key, 0, 5) == "HTTP_") {
 798            // this is chaos, basically it is just there to capitalize the first
 799            // letter of every word that is not an initial HTTP and strip HTTP
 800            // code from przemek
 801            $key = str_replace(
 802              " ",
 803              "-",
 804              ucwords(strtolower(str_replace("_", " ", substr($key, 5))))
 805            );
 806            $out[$key] = $value;
 807          }
 808        }
 809      }
 810      return $out;
 811    }
 812  
 813    // This function takes a input like a=b&a=c&d=e and returns the parsed
 814    // parameters like this
 815    // array('a' => array('b','c'), 'd' => 'e')
 816    public static function parse_parameters( $input ) {
 817      if (!isset($input) || !$input) return array();
 818  
 819      $pairs = explode('&', $input);
 820  
 821      $parsed_parameters = array();
 822      foreach ($pairs as $pair) {
 823        $split = explode('=', $pair, 2);
 824        $parameter = OAuthUtil::urldecode_rfc3986($split[0]);
 825        $value = isset($split[1]) ? OAuthUtil::urldecode_rfc3986($split[1]) : '';
 826  
 827        if (isset($parsed_parameters[$parameter])) {
 828          // We have already recieved parameter(s) with this name, so add to the list
 829          // of parameters with this name
 830  
 831          if (is_scalar($parsed_parameters[$parameter])) {
 832            // This is the first duplicate, so transform scalar (string) into an array
 833            // so we can add the duplicates
 834            $parsed_parameters[$parameter] = array($parsed_parameters[$parameter]);
 835          }
 836  
 837          $parsed_parameters[$parameter][] = $value;
 838        } else {
 839          $parsed_parameters[$parameter] = $value;
 840        }
 841      }
 842      return $parsed_parameters;
 843    }
 844  
 845    public static function build_http_query($params) {
 846      if (!$params) return '';
 847  
 848      // Urlencode both keys and values
 849      $keys = OAuthUtil::urlencode_rfc3986(array_keys($params));
 850      $values = OAuthUtil::urlencode_rfc3986(array_values($params));
 851      $params = array_combine($keys, $values);
 852  
 853      // Parameters are sorted by name, using lexicographical byte value ordering.
 854      // Ref: Spec: 9.1.1 (1)
 855      uksort($params, 'strcmp');
 856  
 857      $pairs = array();
 858      foreach ($params as $parameter => $value) {
 859        if (is_array($value)) {
 860          // If two or more parameters share the same name, they are sorted by their value
 861          // Ref: Spec: 9.1.1 (1)
 862          natsort($value);
 863          foreach ($value as $duplicate_value) {
 864            $pairs[] = $parameter . '=' . $duplicate_value;
 865          }
 866        } else {
 867          $pairs[] = $parameter . '=' . $value;
 868        }
 869      }
 870      // For each parameter, the name is separated from the corresponding value by an '=' character (ASCII code 61)
 871      // Each name-value pair is separated by an '&' character (ASCII code 38)
 872      return implode('&', $pairs);
 873    }
 874  }
 875  
 876  ?>

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