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Code Editor : OAuthUtil.php

<?php

namespace IMSGlobal\LTI\OAuth;

/**
 * Class to provide %OAuth utility methods
 *
 * @copyright  Andy Smith
 * @version 2008-08-04
 * @license https://opensource.org/licenses/MIT The MIT License
 */
class OAuthUtil {

public static function urlencode_rfc3986($input) {

if (is_array($input)) {
            return array_map(array('IMSGlobal\LTI\OAuth\OAuthUtil', 'urlencode_rfc3986'), $input);
        } else if (is_scalar($input)) {
            return str_replace('+', ' ', str_replace('%7E', '~', rawurlencode($input)));
        } else {
            return '';
        }
    }

// This decode function isn't taking into consideration the above
    // modifications to the encoding process. However, this method doesn't
    // seem to be used anywhere so leaving it as is.
    public static function urldecode_rfc3986($string) {
        return urldecode($string);
    }

// Utility function for turning the Authorization: header into
    // parameters, has to do some unescaping
    // Can filter out any non-oauth parameters if needed (default behaviour)
    // May 28th, 2010 - method updated to tjerk.meesters for a speed improvement.
    //                  see http://code.google.com/p/oauth/issues/detail?id=163
    public static function split_header($header, $only_allow_oauth_parameters = true) {

$params = array();
        if (preg_match_all('/('.($only_allow_oauth_parameters ? 'oauth_' : '').'[a-z_-]*)=(:?"([^"]*)"|([^,]*))/', $header, $matches)) {
            foreach ($matches[1] as $i => $h) {
                $params[$h] = OAuthUtil::urldecode_rfc3986(empty($matches[3][$i]) ? $matches[4][$i] : $matches[3][$i]);
            }
            if (isset($params['realm'])) {
                unset($params['realm']);
            }
        }

return $params;

}

// helper to try to sort out headers for people who aren't running apache
    public static function get_headers() {

if (function_exists('apache_request_headers')) {
            // we need this to get the actual Authorization: header
            // because apache tends to tell us it doesn't exist
            $headers = apache_request_headers();

// sanitize the output of apache_request_headers because
            // we always want the keys to be Cased-Like-This and arh()
            // returns the headers in the same case as they are in the
            // request
            $out = array();
            foreach ($headers AS $key => $value) {
                $key = str_replace(" ", "-", ucwords(strtolower(str_replace("-", " ", $key))));
                $out[$key] = $value;
            }
        } else {
            // otherwise we don't have apache and are just going to have to hope
            // that $_SERVER actually contains what we need
            $out = array();
            if( isset($_SERVER['CONTENT_TYPE']) )
                $out['Content-Type'] = $_SERVER['CONTENT_TYPE'];
            if( isset($_ENV['CONTENT_TYPE']) )
                $out['Content-Type'] = $_ENV['CONTENT_TYPE'];

foreach ($_SERVER as $key => $value) {
                if (substr($key, 0, 5) == 'HTTP_') {
                    // this is chaos, basically it is just there to capitalize the first
                    // letter of every word that is not an initial HTTP and strip HTTP
                    // code from przemek
                    $key = str_replace(' ', '-', ucwords(strtolower(str_replace('_', ' ', substr($key, 5)))));
                    $out[$key] = $value;
                }
            }
        }
        return $out;
    }

// This function takes a input like a=b&a=c&d=e and returns the parsed
    // parameters like this
    // array('a' => array('b','c'), 'd' => 'e')
    public static function parse_parameters( $input ) {

if (!isset($input) || !$input) return array();

$pairs = explode('&', $input);

$parsed_parameters = array();
        foreach ($pairs as $pair) {
            $split = explode('=', $pair, 2);
            $parameter = self::urldecode_rfc3986($split[0]);
            $value = isset($split[1]) ? self::urldecode_rfc3986($split[1]) : '';

if (isset($parsed_parameters[$parameter])) {
                // We have already recieved parameter(s) with this name, so add to the list
                // of parameters with this name

if (is_scalar($parsed_parameters[$parameter])) {
                    // This is the first duplicate, so transform scalar (string) into an array
                    // so we can add the duplicates
                    $parsed_parameters[$parameter] = array($parsed_parameters[$parameter]);
                }

$parsed_parameters[$parameter][] = $value;
            } else {
                $parsed_parameters[$parameter] = $value;
            }
        }

return $parsed_parameters;

}

public static function build_http_query($params) {

if (!$params) return '';

// Urlencode both keys and values
        $keys = OAuthUtil::urlencode_rfc3986(array_keys($params));
        $values = OAuthUtil::urlencode_rfc3986(array_values($params));
        $params = array_combine($keys, $values);

// Parameters are sorted by name, using lexicographical byte value ordering.
        // Ref: Spec: 9.1.1 (1)
        uksort($params, 'strcmp');

$pairs = array();
        foreach ($params as $parameter => $value) {
            if (is_array($value)) {
                // If two or more parameters share the same name, they are sorted by their value
                // Ref: Spec: 9.1.1 (1)
                // June 12th, 2010 - changed to sort because of issue 164 by hidetaka
                sort($value, SORT_STRING);
                foreach ($value as $duplicate_value) {
                    $pairs[] = $parameter . '=' . $duplicate_value;
                }
            } else {
                $pairs[] = $parameter . '=' . $value;
            }
        }

// For each parameter, the name is separated from the corresponding value by an '=' character (ASCII code 61)
        // Each name-value pair is separated by an '&' character (ASCII code 38)
        return implode('&', $pairs);

}

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Code Editor : OAuthUtil.php