Utility.php

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<?php
#require_once 'Zend/Oauth.php';

#require_once 'Zend/Oauth/Http.php';

class Zend_Oauth_Http_Utility
{
    public function assembleParams(
        $url,
        Zend_Oauth_Config_ConfigInterface $config,
        array $serviceProviderParams = null
    ) {
        $params = array(
            'oauth_consumer_key'     => $config->getConsumerKey(),
            'oauth_nonce'            => $this->generateNonce(),
            'oauth_signature_method' => $config->getSignatureMethod(),
            'oauth_timestamp'        => $this->generateTimestamp(),
            'oauth_version'          => $config->getVersion(),
        );

        if ($config->getToken()->getToken() != null) {
            $params['oauth_token'] = $config->getToken()->getToken();
        }


        if ($serviceProviderParams !== null) {
            $params = array_merge($params, $serviceProviderParams);
        }

        $params['oauth_signature'] = $this->sign(
            $params,
            $config->getSignatureMethod(),
            $config->getConsumerSecret(),
            $config->getToken()->getTokenSecret(),
            $config->getRequestMethod(),
            $url
        );

        return $params;
    }

    public function toEncodedQueryString(array $params, $customParamsOnly = false)
    {
        if ($customParamsOnly) {
            foreach ($params as $key=>$value) {
                if (preg_match("/^oauth_/", $key)) {
                    unset($params[$key]);
                }
            }
        }
        $encodedParams = array();
        foreach ($params as $key => $value) {
            $encodedParams[] = self::urlEncode($key)
                             . '='
                             . self::urlEncode($value);
        }
        return implode('&', $encodedParams);
    }

    public function toAuthorizationHeader(array $params, $realm = null, $excludeCustomParams = true)
    {
        $headerValue = array(
            'OAuth realm="' . $realm . '"',
        );

        foreach ($params as $key => $value) {
            if ($excludeCustomParams) {
                if (!preg_match("/^oauth_/", $key)) {
                    continue;
                }
            }
            $headerValue[] = self::urlEncode($key)
                           . '="'
                           . self::urlEncode($value) . '"';
        }
        return implode(",", $headerValue);
    }

    public function sign(
        array $params, $signatureMethod, $consumerSecret, $tokenSecret = null, $method = null, $url = null
    ) {
        $className = '';
        $hashAlgo  = null;
        $parts     = explode('-', $signatureMethod);
        if (count($parts) > 1) {
            $className = 'Zend_Oauth_Signature_' . ucfirst(strtolower($parts[0]));
            $hashAlgo  = $parts[1];
        } else {
            $className = 'Zend_Oauth_Signature_' . ucfirst(strtolower($signatureMethod));
        }

        #require_once str_replace('_', '/', $className) . '.php';
        $signatureObject = new $className($consumerSecret, $tokenSecret, $hashAlgo);
        return $signatureObject->sign($params, $method, $url);
    }

    public function parseQueryString($query)
    {
        $params = array();
        if (empty($query)) {
            return array();
        }

        // Not remotely perfect but beats parse_str() which converts
        // periods and uses urldecode, not rawurldecode.
        $parts = explode('&', $query);
        foreach ($parts as $pair) {
            $kv = explode('=', $pair);
            $params[rawurldecode($kv[0])] = rawurldecode($kv[1]);
        }
        return $params;
    }

    public function generateNonce()
    {
        return md5(uniqid(rand(), true));
    }

    public function generateTimestamp()
    {
        return time();
    }

    public static function urlEncode($value)
    {
        $encoded = rawurlencode($value);
        $encoded = str_replace('%7E', '~', $encoded);
        return $encoded;
    }
}