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Code Editor : OAuthRequest.php

<?php

namespace IMSGlobal\LTI\OAuth;

/**
 * Class to represent an %OAuth Request
 *
 * @copyright  Andy Smith
 * @version 2008-08-04
 * @license https://opensource.org/licenses/MIT The MIT License
 */
class OAuthRequest {

protected $parameters;
    protected $http_method;
    protected $http_url;
    // for debug purposes
    public $base_string;
    public static $version = '1.0';

function __construct($http_method, $http_url, $parameters = null) {

$parameters = ($parameters) ? $parameters : array();
        $parameters = array_merge( OAuthUtil::parse_parameters(parse_url($http_url, PHP_URL_QUERY)), $parameters);
        $this->parameters = $parameters;
        $this->http_method = $http_method;
        $this->http_url = $http_url;

}

/**
     * attempt to build up a request from what was passed to the server
     */
    public static function from_request($http_method = null, $http_url = null, $parameters = null) {

$scheme = (!isset($_SERVER['HTTPS']) || $_SERVER['HTTPS'] != "on")
                ? 'http'
                : 'https';
      $http_url = ($http_url) ? $http_url : $scheme .
                                '://' . $_SERVER['SERVER_NAME'] .
                                ':' .
                                $_SERVER['SERVER_PORT'] .
                                $_SERVER['REQUEST_URI'];
      $http_method = ($http_method) ? $http_method : $_SERVER['REQUEST_METHOD'];

// We weren't handed any parameters, so let's find the ones relevant to
      // this request.
      // If you run XML-RPC or similar you should use this to provide your own
      // parsed parameter-list
      if (!$parameters) {
          // Find request headers
          $request_headers = OAuthUtil::get_headers();

// Parse the query-string to find GET parameters
          if (isset($_SERVER['QUERY_STRING'])) {
              $parameters = OAuthUtil::parse_parameters($_SERVER['QUERY_STRING']);
          } else {
              $parameters = array();
          }

// We have a Authorization-header with OAuth data. Parse the header and add those.
          if (isset($request_headers['Authorization']) && substr($request_headers['Authorization'], 0, 6) == 'OAuth ') {
              $header_parameters = OAuthUtil::split_header($request_headers['Authorization']);
              $parameters = array_merge($parameters, $header_parameters);
          }

// If there are parameters in $_POST, these are likely what will be used. Therefore, they should be considered
          // the final value in the case of any duplicates from sources parsed above.
          $parameters = array_merge($parameters, $_POST);
      }

return new OAuthRequest($http_method, $http_url, $parameters);
    }

/**
     * pretty much a helper function to set up the request
     */
    public static function from_consumer_and_token($consumer, $token, $http_method, $http_url, $parameters = null) {

$parameters = ($parameters) ?  $parameters : array();
        $defaults = array('oauth_version' => OAuthRequest::$version,
                          'oauth_nonce' => OAuthRequest::generate_nonce(),
                          'oauth_timestamp' => OAuthRequest::generate_timestamp(),
                          'oauth_consumer_key' => $consumer->key);
        if ($token)
            $defaults['oauth_token'] = $token->key;

$parameters = array_merge($defaults, $parameters);

return new OAuthRequest($http_method, $http_url, $parameters);

}

public function set_parameter($name, $value, $allow_duplicates = true) {

if ($allow_duplicates && isset($this->parameters[$name])) {
          // We have already added parameter(s) with this name, so add to the list
          if (is_scalar($this->parameters[$name])) {
              // This is the first duplicate, so transform scalar (string)
              // into an array so we can add the duplicates
              $this->parameters[$name] = array($this->parameters[$name]);
          }

$this->parameters[$name][] = $value;
      } else {
          $this->parameters[$name] = $value;
      }
    }

public function get_parameter($name) {
        return isset($this->parameters[$name]) ? $this->parameters[$name] : null;
    }

public function get_parameters() {
        return $this->parameters;
    }

public function unset_parameter($name) {
        unset($this->parameters[$name]);
    }

/**
     * The request parameters, sorted and concatenated into a normalized string.
     * @return string
     */
    public function get_signable_parameters() {

// Grab all parameters
        $params = $this->parameters;

// Remove oauth_signature if present
        // Ref: Spec: 9.1.1 ("The oauth_signature parameter MUST be excluded.")
        if (isset($params['oauth_signature'])) {
            unset($params['oauth_signature']);
        }

return OAuthUtil::build_http_query($params);

}

/**
     * Returns the base string of this request
     *
     * The base string defined as the method, the url
     * and the parameters (normalized), each urlencoded
     * and the concated with &.
     */
    public function get_signature_base_string() {
        $parts = array(
            $this->get_normalized_http_method(),
            $this->get_normalized_http_url(),
            $this->get_signable_parameters()
        );

$parts = OAuthUtil::urlencode_rfc3986($parts);

return implode('&', $parts);

}

/**
     * just uppercases the http method
     */
    public function get_normalized_http_method() {
        return strtoupper($this->http_method);
    }

/**
     * parses the url and rebuilds it to be
     * scheme://host/path
     */
    public function get_normalized_http_url() {

$parts = parse_url($this->http_url);

$scheme = (isset($parts['scheme'])) ? $parts['scheme'] : 'http';
        $port = (isset($parts['port'])) ? $parts['port'] : (($scheme == 'https') ? '443' : '80');
        $host = (isset($parts['host'])) ? strtolower($parts['host']) : '';
        $path = (isset($parts['path'])) ? $parts['path'] : '';

if (($scheme == 'https' && $port != '443')
            || ($scheme == 'http' && $port != '80')) {
            $host = "$host:$port";
        }

return "$scheme://$host$path";

}

/**
     * builds a url usable for a GET request
     */
    public function to_url() {

$post_data = $this->to_postdata();
        $out = $this->get_normalized_http_url();
        if ($post_data) {
            $out .= '?'.$post_data;
        }

return $out;

}

/**
     * builds the data one would send in a POST request
     */
    public function to_postdata() {
        return OAuthUtil::build_http_query($this->parameters);
    }

/**
     * builds the Authorization: header
     */
    public function to_header($realm = null) {

$first = true;
        if($realm) {
            $out = 'Authorization: OAuth realm="' . OAuthUtil::urlencode_rfc3986($realm) . '"';
            $first = false;
        } else
            $out = 'Authorization: OAuth';

$total = array();
        foreach ($this->parameters as $k => $v) {
            if (substr($k, 0, 5) != "oauth") continue;
            if (is_array($v)) {
              throw new OAuthException('Arrays not supported in headers');
            }
            $out .= ($first) ? ' ' : ',';
            $out .= OAuthUtil::urlencode_rfc3986($k) .
                    '="' .
                    OAuthUtil::urlencode_rfc3986($v) .
                    '"';
            $first = false;
        }

return $out;

}

public function __toString() {
        return $this->to_url();
    }

public function sign_request($signature_method, $consumer, $token) {

$this->set_parameter(
          "oauth_signature_method",
          $signature_method->get_name(),
          false
        );
        $signature = $this->build_signature($signature_method, $consumer, $token);
        $this->set_parameter("oauth_signature", $signature, false);

}

public function build_signature($signature_method, $consumer, $token) {
        $signature = $signature_method->build_signature($this, $consumer, $token);
        return $signature;
    }

/**
     * util function: current timestamp
     */
    private static function generate_timestamp() {
        return time();
    }

/**
     * util function: current nonce
     */
    private static function generate_nonce() {
        $mt = microtime();
        $rand = mt_rand();

return md5($mt . $rand); // md5s look nicer than numbers
    }

}

${this.title}

Code Editor : OAuthRequest.php