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index.php

<?php

// Include twitteroauth
include('twitteroauth.php');
// Set keys
$consumerKey = '....';
$consumerSecret = '...';
$accessToken = '...';
$accessTokenSecret = '....';

// Create object
$tweet = new TwitterOAuth($consumerKey, $consumerSecret, $accessToken, $accessTokenSecret);

// Set status message
$tweetMessage = ''Mana ziņa'';

// Check for 140 characters
if(strlen($tweetMessage) <= 140)
{
   // Post the status message
   $tweet->post('statuses/update', array('status' => $tweetMessage));
}
?>

twitteroauth.php
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<?php

/*
* Abraham Williams (abraham@abrah.am) http://abrah.am
*
* The first PHP Library to support OAuth for Twitter's REST API.
*/

/* Load OAuth lib. You can find it at http://oauth.net */
require_once('OAuth.php');

/**
* Twitter OAuth class
*/
class TwitterOAuth {
 /* Contains the last HTTP status code returned. */
 public $http_code;
 /* Contains the last API call. */
 public $url;
 /* Set up the API root URL. */
 public $host = "https://api.twitter.com/1.1/";
 /* Set timeout default. */
 public $timeout = 30;
 /* Set connect timeout. */
 public $connecttimeout = 30;
 /* Verify SSL Cert. */
 public $ssl_verifypeer = TRUE;
 /* Respons format. */
 public $format = 'json';
 /* Decode returned json data. */
 public $decode_json = TRUE;
 /* Contains the last HTTP headers returned. */
 public $http_info;
 /* Set the useragnet. */
 public $useragent = 'TwitterOAuth v0.2.0-beta2';
 /* Immediately retry the API call if the response was not successful. */





 /**
  * Set API URLS
  */
 function accessTokenURL()  { return 'https://api.twitter.com/oauth/access_token'; }
 function authenticateURL() { return 'https://twitter.com/oauth/authenticate'; }
 function authorizeURL()    { return 'https://twitter.com/oauth/authorize'; }
 function requestTokenURL() { return 'https://api.twitter.com/oauth/request_token'; }

 /**
  * Debug helpers
  */
 function lastStatusCode() { return $this->http_status; }
 function lastAPICall() { return $this->last_api_call; }

 /**
  * construct TwitterOAuth object
  */
 function __construct($consumer_key, $consumer_secret, $oauth_token = NULL, $oauth_token_secret = NULL) {
   $this->sha1_method = new OAuthSignatureMethod_HMAC_SHA1();
   $this->consumer = new OAuthConsumer($consumer_key, $consumer_secret);
   if (!empty($oauth_token) && !empty($oauth_token_secret)) {
     $this->token = new OAuthConsumer($oauth_token, $oauth_token_secret);
   } else {
     $this->token = NULL;
   }
 }


 /**
  * Get a request_token from Twitter
  *
  * @returns a key/value array containing oauth_token and oauth_token_secret
  */
 function getRequestToken($oauth_callback = NULL) {
   $parameters = array();
   if (!empty($oauth_callback)) {
     $parameters['oauth_callback'] = $oauth_callback;
   }
   $request = $this->oAuthRequest($this->requestTokenURL(), 'GET', $parameters);
   $token = OAuthUtil::parse_parameters($request);
   $this->token = new OAuthConsumer($token['oauth_token'], $token['oauth_token_secret']);
   return $token;
 }

 /**
  * Get the authorize URL
  *
  * @returns a string
  */
 function getAuthorizeURL($token, $sign_in_with_twitter = TRUE) {
   if (is_array($token)) {
     $token = $token['oauth_token'];
   }
   if (empty($sign_in_with_twitter)) {
     return $this->authorizeURL() . "?oauth_token={$token}";
   } else {
      return $this->authenticateURL() . "?oauth_token={$token}";
   }
 }

 /**
  * Exchange request token and secret for an access token and
  * secret, to sign API calls.
  *
  * @returns array("oauth_token" => "the-access-token",
  *                "oauth_token_secret" => "the-access-secret",
  *                "user_id" => "9436992",
  *                "screen_name" => "abraham")
  */
 function getAccessToken($oauth_verifier = FALSE) {
   $parameters = array();
   if (!empty($oauth_verifier)) {
     $parameters['oauth_verifier'] = $oauth_verifier;
   }
   $request = $this->oAuthRequest($this->accessTokenURL(), 'GET', $parameters);
   $token = OAuthUtil::parse_parameters($request);
   $this->token = new OAuthConsumer($token['oauth_token'], $token['oauth_token_secret']);
   return $token;
 }

 /**
  * One time exchange of username and password for access token and secret.
  *
  * @returns array("oauth_token" => "the-access-token",
  *                "oauth_token_secret" => "the-access-secret",
  *                "user_id" => "9436992",
  *                "screen_name" => "abraham",
  *                "x_auth_expires" => "0")
  */  
 function getXAuthToken($username, $password) {
   $parameters = array();
   $parameters['x_auth_username'] = $username;
   $parameters['x_auth_password'] = $password;
   $parameters['x_auth_mode'] = 'client_auth';
   $request = $this->oAuthRequest($this->accessTokenURL(), 'POST', $parameters);
   $token = OAuthUtil::parse_parameters($request);
   $this->token = new OAuthConsumer($token['oauth_token'], $token['oauth_token_secret']);
   return $token;
 }

 /**
  * GET wrapper for oAuthRequest.
  */
 function get($url, $parameters = array()) {
   $response = $this->oAuthRequest($url, 'GET', $parameters);
   if ($this->format === 'json' && $this->decode_json) {
     return json_decode($response);
   }
   return $response;
 }
 
 /**
  * POST wrapper for oAuthRequest.
  */
 function post($url, $parameters = array()) {
   $response = $this->oAuthRequest($url, 'POST', $parameters);
   if ($this->format === 'json' && $this->decode_json) {
     return json_decode($response);
   }
   return $response;
 }

 /**
  * DELETE wrapper for oAuthReqeust.
  */
 function delete($url, $parameters = array()) {
   $response = $this->oAuthRequest($url, 'DELETE', $parameters);
   if ($this->format === 'json' && $this->decode_json) {
     return json_decode($response);
   }
   return $response;
 }

 /**
  * Format and sign an OAuth / API request
  */
 function oAuthRequest($url, $method, $parameters) {
   if (strrpos($url, 'https://') !== 0 && strrpos($url, 'http://') !== 0) {
     $url = "{$this->host}{$url}.{$this->format}";
   }
   $request = OAuthRequest::from_consumer_and_token($this->consumer, $this->token, $method, $url, $parameters);
   $request->sign_request($this->sha1_method, $this->consumer, $this->token);
   switch ($method) {
   case 'GET':
     return $this->http($request->to_url(), 'GET');
   default:
     return $this->http($request->get_normalized_http_url(), $method, $request->to_postdata());
   }
 }

 /**
  * Make an HTTP request
  *
  * @return API results
  */
 function http($url, $method, $postfields = NULL) {
   $this->http_info = array();
   $ci = curl_init();
   /* Curl settings */
   curl_setopt($ci, CURLOPT_USERAGENT, $this->useragent);
   curl_setopt($ci, CURLOPT_CONNECTTIMEOUT, $this->connecttimeout);
   curl_setopt($ci, CURLOPT_TIMEOUT, $this->timeout);
   curl_setopt($ci, CURLOPT_RETURNTRANSFER, TRUE);
   curl_setopt($ci, CURLOPT_HTTPHEADER, array('Expect:'));
   curl_setopt($ci, CURLOPT_SSL_VERIFYPEER, $this->ssl_verifypeer);
   curl_setopt($ci, CURLOPT_HEADERFUNCTION, array($this, 'getHeader'));
   curl_setopt($ci, CURLOPT_HEADER, FALSE);

   switch ($method) {
     case 'POST':
       curl_setopt($ci, CURLOPT_POST, TRUE);
       if (!empty($postfields)) {
         curl_setopt($ci, CURLOPT_POSTFIELDS, $postfields);
       }
       break;
     case 'DELETE':
       curl_setopt($ci, CURLOPT_CUSTOMREQUEST, 'DELETE');
       if (!empty($postfields)) {
         $url = "{$url}?{$postfields}";
       }
   }

   curl_setopt($ci, CURLOPT_URL, $url);
   $response = curl_exec($ci);
   $this->http_code = curl_getinfo($ci, CURLINFO_HTTP_CODE);
   $this->http_info = array_merge($this->http_info, curl_getinfo($ci));
   $this->url = $url;
   curl_close ($ci);
   return $response;
 }

 /**
  * Get the header info to store.
  */
 function getHeader($ch, $header) {
   $i = strpos($header, ':');
   if (!empty($i)) {
     $key = str_replace('-', '_', strtolower(substr($header, 0, $i)));
     $value = trim(substr($header, $i + 2));
     $this->http_header[$key] = $value;
   }
   return strlen($header);
 }
}



OAuth.php

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<?php
// vim: foldmethod=marker

/* Generic exception class
*/
class OAuthException extends Exception {
 // pass
}

class OAuthConsumer {
 public $key;
 public $secret;

 function __construct($key, $secret, $callback_url=NULL) {
   $this->key = $key;
   $this->secret = $secret;
   $this->callback_url = $callback_url;
 }

 function __toString() {
   return "OAuthConsumer[key=$this->key,secret=$this->secret]";
 }
}

class OAuthToken {
 // access tokens and request tokens
 public $key;
 public $secret;

 /**
  * key = the token
  * secret = the token secret
  */
 function __construct($key, $secret) {
   $this->key = $key;
   $this->secret = $secret;
 }

 /**
  * generates the basic string serialization of a token that a server
  * would respond to request_token and access_token calls with
  */
 function to_string() {
   return "oauth_token=" .
          OAuthUtil::urlencode_rfc3986($this->key) .
          "&oauth_token_secret=" .
          OAuthUtil::urlencode_rfc3986($this->secret);
 }

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

/**
* A class for implementing a Signature Method
* See section 9 ("Signing Requests") in the spec
*/
abstract class OAuthSignatureMethod {
 /**
  * Needs to return the name of the Signature Method (ie HMAC-SHA1)
  * @return string
  */
 abstract public function get_name();

 /**
  * Build up the signature
  * NOTE: The output of this function MUST NOT be urlencoded.
  * the encoding is handled in OAuthRequest when the final
  * request is serialized
  * @param OAuthRequest $request
  * @param OAuthConsumer $consumer
  * @param OAuthToken $token
  * @return string
  */
 abstract public function build_signature($request, $consumer, $token);

 /**
  * Verifies that a given signature is correct
  * @param OAuthRequest $request
  * @param OAuthConsumer $consumer
  * @param OAuthToken $token
  * @param string $signature
  * @return bool
  */
 public function check_signature($request, $consumer, $token, $signature) {
   $built = $this->build_signature($request, $consumer, $token);
   return $built == $signature;
 }
}

/**
* The HMAC-SHA1 signature method uses the HMAC-SHA1 signature algorithm as defined in [RFC2104]
* where the Signature Base String is the text and the key is the concatenated values (each first
* encoded per Parameter Encoding) of the Consumer Secret and Token Secret, separated by an '&'
* character (ASCII code 38) even if empty.
*   - Chapter 9.2 ("HMAC-SHA1")
*/
class OAuthSignatureMethod_HMAC_SHA1 extends OAuthSignatureMethod {
 function get_name() {
   return "HMAC-SHA1";
 }

 public function build_signature($request, $consumer, $token) {
   $base_string = $request->get_signature_base_string();
   $request->base_string = $base_string;

   $key_parts = array(
     $consumer->secret,
     ($token) ? $token->secret : ""
   );

   $key_parts = OAuthUtil::urlencode_rfc3986($key_parts);
   $key = implode('&', $key_parts);

   return base64_encode(hash_hmac('sha1', $base_string, $key, true));
 }
}

/**
* The PLAINTEXT method does not provide any security protection and SHOULD only be used
* over a secure channel such as HTTPS. It does not use the Signature Base String.
*   - Chapter 9.4 ("PLAINTEXT")
*/
class OAuthSignatureMethod_PLAINTEXT extends OAuthSignatureMethod {
 public function get_name() {
   return "PLAINTEXT";
 }

 /**
  * oauth_signature is set to the concatenated encoded values of the Consumer Secret and
  * Token Secret, separated by a '&' character (ASCII code 38), even if either secret is
  * empty. The result MUST be encoded again.
  *   - Chapter 9.4.1 ("Generating Signatures")
  *
  * Please note that the second encoding MUST NOT happen in the SignatureMethod, as
  * OAuthRequest handles this!
  */
 public function build_signature($request, $consumer, $token) {
   $key_parts = array(
     $consumer->secret,
     ($token) ? $token->secret : ""
   );

   $key_parts = OAuthUtil::urlencode_rfc3986($key_parts);
   $key = implode('&', $key_parts);
   $request->base_string = $key;

   return $key;
 }
}

/**
* The RSA-SHA1 signature method uses the RSASSA-PKCS1-v1_5 signature algorithm as defined in
* [RFC3447] section 8.2 (more simply known as PKCS#1), using SHA-1 as the hash function for
* EMSA-PKCS1-v1_5. It is assumed that the Consumer has provided its RSA public key in a
* verified way to the Service Provider, in a manner which is beyond the scope of this
* specification.
*   - Chapter 9.3 ("RSA-SHA1")
*/
abstract class OAuthSignatureMethod_RSA_SHA1 extends OAuthSignatureMethod {
 public function get_name() {
   return "RSA-SHA1";
 }

 // Up to the SP to implement this lookup of keys. Possible ideas are:
 // (1) do a lookup in a table of trusted certs keyed off of consumer
 // (2) fetch via http using a url provided by the requester
 // (3) some sort of specific discovery code based on request
 //
 // Either way should return a string representation of the certificate
 protected abstract function fetch_public_cert(&$request);

 // Up to the SP to implement this lookup of keys. Possible ideas are:
 // (1) do a lookup in a table of trusted certs keyed off of consumer
 //
 // Either way should return a string representation of the certificate
 protected abstract function fetch_private_cert(&$request);

 public function build_signature($request, $consumer, $token) {
   $base_string = $request->get_signature_base_string();
   $request->base_string = $base_string;

   // Fetch the private key cert based on the request
   $cert = $this->fetch_private_cert($request);

   // Pull the private key ID from the certificate
   $privatekeyid = openssl_get_privatekey($cert);

   // Sign using the key
   $ok = openssl_sign($base_string, $signature, $privatekeyid);

   // Release the key resource
   openssl_free_key($privatekeyid);

   return base64_encode($signature);
 }

 public function check_signature($request, $consumer, $token, $signature) {
   $decoded_sig = base64_decode($signature);

   $base_string = $request->get_signature_base_string();

   // Fetch the public key cert based on the request
   $cert = $this->fetch_public_cert($request);

   // Pull the public key ID from the certificate
   $publickeyid = openssl_get_publickey($cert);

   // Check the computed signature against the one passed in the query
   $ok = openssl_verify($base_string, $decoded_sig, $publickeyid);

   // Release the key resource
   openssl_free_key($publickeyid);

   return $ok == 1;
 }
}

class OAuthRequest {
 private $parameters;
 private $http_method;
 private $http_url;
 // for debug purposes
 public $base_string;
 public static $version = '1.0';
 public static $POST_INPUT = 'php://input';

 function __construct($http_method, $http_url, $parameters=NULL) {
   @$parameters or $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 or $http_url = $scheme .
                             '://' . $_SERVER['HTTP_HOST'] .
                             ':' .
                             $_SERVER['SERVER_PORT'] .
                             $_SERVER['REQUEST_URI'];
   @$http_method or $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
     $parameters = OAuthUtil::parse_parameters($_SERVER['QUERY_STRING']);

     // It's a POST request of the proper content-type, so parse POST
     // parameters and add those overriding any duplicates from GET
     if ($http_method == "POST"
         && @strstr($request_headers["Content-Type"],
                    "application/x-www-form-urlencoded")
         ) {
       $post_data = OAuthUtil::parse_parameters(
         file_get_contents(self::$POST_INPUT)
       );
       $parameters = array_merge($parameters, $post_data);
     }

     // We have a Authorization-header with OAuth data. Parse the header
     // and add those overriding any duplicates from GET or POST
     if (@substr($request_headers['Authorization'], 0, 6) == "OAuth ") {
       $header_parameters = OAuthUtil::split_header(
         $request_headers['Authorization']
       );
       $parameters = array_merge($parameters, $header_parameters);
     }

   }

   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 or $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);

   $port = @$parts['port'];
   $scheme = $parts['scheme'];
   $host = $parts['host'];
   $path = @$parts['path'];

   $port or $port = ($scheme == 'https') ? '443' : '80';

   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
 }
}

class OAuthServer {
 protected $timestamp_threshold = 300; // in seconds, five minutes
 protected $version = '1.0';             // hi blaine
 protected $signature_methods = array();

 protected $data_store;

 function __construct($data_store) {
   $this->data_store = $data_store;
 }

 public function add_signature_method($signature_method) {
   $this->signature_methods[$signature_method->get_name()] =
     $signature_method;
 }

 // high level functions

 /**
  * process a request_token request
  * returns the request token on success
  */
 public function fetch_request_token(&$request) {
   $this->get_version($request);

   $consumer = $this->get_consumer($request);

   // no token required for the initial token request
   $token = NULL;

   $this->check_signature($request, $consumer, $token);

   // Rev A change
   $callback = $request->get_parameter('oauth_callback');
   $new_token = $this->data_store->new_request_token($consumer, $callback);

   return $new_token;
 }

 /**
  * process an access_token request
  * returns the access token on success
  */
 public function fetch_access_token(&$request) {
   $this->get_version($request);

   $consumer = $this->get_consumer($request);

   // requires authorized request token
   $token = $this->get_token($request, $consumer, "request");

   $this->check_signature($request, $consumer, $token);

   // Rev A change
   $verifier = $request->get_parameter('oauth_verifier');
   $new_token = $this->data_store->new_access_token($token, $consumer, $verifier);

   return $new_token;
 }

 /**
  * verify an api call, checks all the parameters
  */
 public function verify_request(&$request) {
   $this->get_version($request);
   $consumer = $this->get_consumer($request);
   $token = $this->get_token($request, $consumer, "access");
   $this->check_signature($request, $consumer, $token);
   return array($consumer, $token);
 }

 // Internals from here
 /**
  * version 1
  */
 private function get_version(&$request) {
   $version = $request->get_parameter("oauth_version");
   if (!$version) {
     // Service Providers MUST assume the protocol version to be 1.0 if this parameter is not present.
     // Chapter 7.0 ("Accessing Protected Ressources")
     $version = '1.0';
   }
   if ($version !== $this->version) {
     throw new OAuthException("OAuth version '$version' not supported");
   }
   return $version;
 }

 /**
  * figure out the signature with some defaults
  */
 private function get_signature_method(&$request) {
   $signature_method =
       @$request->get_parameter("oauth_signature_method");

   if (!$signature_method) {
     // According to chapter 7 ("Accessing Protected Ressources") the signature-method
     // parameter is required, and we can't just fallback to PLAINTEXT
     throw new OAuthException('No signature method parameter. This parameter is required');
   }

   if (!in_array($signature_method,
                 array_keys($this->signature_methods))) {
     throw new OAuthException(
       "Signature method '$signature_method' not supported " .
       "try one of the following: " .
       implode(", ", array_keys($this->signature_methods))
     );
   }
   return $this->signature_methods[$signature_method];
 }

 /**
  * try to find the consumer for the provided request's consumer key
  */
 private function get_consumer(&$request) {
   $consumer_key = @$request->get_parameter("oauth_consumer_key");
   if (!$consumer_key) {
     throw new OAuthException("Invalid consumer key");
   }

   $consumer = $this->data_store->lookup_consumer($consumer_key);
   if (!$consumer) {
     throw new OAuthException("Invalid consumer");
   }

   return $consumer;
 }

 /**
  * try to find the token for the provided request's token key
  */
 private function get_token(&$request, $consumer, $token_type="access") {
   $token_field = @$request->get_parameter('oauth_token');
   $token = $this->data_store->lookup_token(
     $consumer, $token_type, $token_field
   );
   if (!$token) {
     throw new OAuthException("Invalid $token_type token: $token_field");
   }
   return $token;
 }

 /**
  * all-in-one function to check the signature on a request
  * should guess the signature method appropriately
  */
 private function check_signature(&$request, $consumer, $token) {
   // this should probably be in a different method
   $timestamp = @$request->get_parameter('oauth_timestamp');
   $nonce = @$request->get_parameter('oauth_nonce');

   $this->check_timestamp($timestamp);
   $this->check_nonce($consumer, $token, $nonce, $timestamp);

   $signature_method = $this->get_signature_method($request);

   $signature = $request->get_parameter('oauth_signature');
   $valid_sig = $signature_method->check_signature(
     $request,
     $consumer,
     $token,
     $signature
   );

   if (!$valid_sig) {
     throw new OAuthException("Invalid signature");
   }
 }

 /**
  * check that the timestamp is new enough
  */
 private function check_timestamp($timestamp) {
   if( ! $timestamp )
     throw new OAuthException(
       'Missing timestamp parameter. The parameter is required'
     );
   
   // verify that timestamp is recentish
   $now = time();
   if (abs($now - $timestamp) > $this->timestamp_threshold) {
     throw new OAuthException(
       "Expired timestamp, yours $timestamp, ours $now"
     );
   }
 }

 /**
  * check that the nonce is not repeated
  */
 private function check_nonce($consumer, $token, $nonce, $timestamp) {
   if( ! $nonce )
     throw new OAuthException(
       'Missing nonce parameter. The parameter is required'
     );

   // verify that the nonce is uniqueish
   $found = $this->data_store->lookup_nonce(
     $consumer,
     $token,
     $nonce,
     $timestamp
   );
   if ($found) {
     throw new OAuthException("Nonce already used: $nonce");
   }
 }

}

class OAuthDataStore {
 function lookup_consumer($consumer_key) {
   // implement me
 }

 function lookup_token($consumer, $token_type, $token) {
   // implement me
 }

 function lookup_nonce($consumer, $token, $nonce, $timestamp) {
   // implement me
 }

 function new_request_token($consumer, $callback = null) {
   // return a new token attached to this consumer
 }

 function new_access_token($token, $consumer, $verifier = null) {
   // return a new access token attached to this consumer
   // for the user associated with this token if the request token
   // is authorized
   // should also invalidate the request token
 }

}

class OAuthUtil {
 public static function urlencode_rfc3986($input) {
 if (is_array($input)) {
   return array_map(array('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)
 public static function split_header($header, $only_allow_oauth_parameters = true) {
   $pattern = '/(([-_a-z]*)=("([^"]*)"|([^,]*)),?)/';
   $offset = 0;
   $params = array();
   while (preg_match($pattern, $header, $matches, PREG_OFFSET_CAPTURE, $offset) > 0) {
     $match = $matches[0];
     $header_name = $matches[2][0];
     $header_content = (isset($matches[5])) ? $matches[5][0] : $matches[4][0];
     if (preg_match('/^oauth_/', $header_name) || !$only_allow_oauth_parameters) {
       $params[$header_name] = OAuthUtil::urldecode_rfc3986($header_content);
     }
     $offset = $match[1] + strlen($match[0]);
   }

   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);
     $parameter = OAuthUtil::urldecode_rfc3986($split[0]);
     $value = isset($split[1]) ? OAuthUtil::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)
       natsort($value);
       foreach ($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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