<?php
/*
	Twitter API Library
	Author: Navarr T. Barnier
	More Info & Usage License: http://tech.gtaero.net/code/twitter-api-library
*/
class Twitter
{
	public $api;
	protected $auth;
	protected $key;
	protected $secret;
	protected $vars;
	function __construct($key,$secret)
	{
		$this->key = $key;
		$this->secret = $secret;
		// Setup the Session
			$this->pullVars();

		// Setup the API
			$this->api = new TwitterAPI;
	}
	private function setVar($var,$val)
	{
		$this->vars[$var] = $val;
		$_SESSION["TWITTERAPI_vars"][$var] = $val;
	}
	private function getVar($var)
	{
		if(!isset($this->vars[$var])) { return NULL; }
		return $this->vars[$var];
	}
	private function pullVars()
	{
		if(session_id() == "") { session_start(); }
		if(!isset($_SESSION["TWITTERAPI_vars"])) { return false; }
		foreach($_SESSION["TWITTERAPI_vars"] as $k => $v)
		{
			$this->vars[$k] = $v;
		}
	}
	public function get_login()
	{
		return array($this->getVar("OAUTH_ACCESS_TOKEN"),$this->getVar("OAUTH_ACCESS_TOKEN_SECRET"));
	}
	public function require_login()
	{
		// Get the State, I guess.
		if($_REQUEST["oauth_token"] != NULL && $this->getVar("OAUTH_STATE") === "START")
			{ $this->setVar("OAUTH_STATE","RETURNED"); }
		switch($this->getVar("OAUTH_STATE"))
		{
			case "RETURNED":
				if($this->getVar("OAUTH_ACCESS_TOKEN") === NULL && $this->getVar("OAUTH_ACCESS_TOKEN_SECRET") === NULL)
				{
					$this->auth = new TwitterOAuth($this->key,$this->secret,$this->getVar("OAUTH_REQUEST_TOKEN"),$this->getVar("OAUTH_REQUEST_TOKEN_SECRET"));
					$tok = $this->auth->getAccessToken();
					$this->setVar("OAUTH_ACCESS_TOKEN",$tok['oauth_token']);
					$this->setVar("OAUTH_ACCESS_TOKEN_SECRET",$tok['oauth_token_secret']);
				}
				$this->auth = new TwitterOAuth($this->key,$this->secret,$this->getVar("OAUTH_ACCESS_TOKEN"),$this->getVar("OAUTH_ACCESS_TOKEN_SECRET"));
				break;
			default:
				$this->auth = new TwitterOAuth($this->key,$this->secret);
				$tok = $this->auth->getRequestToken();
				print("<pre>");print_r($tok);print("</pre>");
				$this->setVar("RETURN_TO",1);
				$this->setVar("RETURN_URI","http://".$_SERVER["SERVER_NAME"].$_SERVER["REQUEST_URI"]);
				$this->setVar("OAUTH_REQUEST_TOKEN",$tok['oauth_token']);
				$this->setVar("OAUTH_REQUEST_TOKEN_SECRET",$tok['oauth_token_secret']);
				$this->setVar("OAUTH_STATE","START");
				$rql = $this->auth->getAuthorizeURL($tok);
				session_write_close();
				session_regenerate_id();
				header("Location: $rql");
				print("<a href=\"$rql\">$rql</a>");
				break;
		}
		$this->api->auth = $this->auth;
	}
	public function use_login($tokKey,$tokSecret)
	{
		$this->auth = new TwitterOAuth($this->key,$this->secret,$tokKey,$tokSecret);
		$this->api->auth = $this->auth;
	}
}

class TwitterAPI
{
	public $auth;
	public $return = "json";
	private function addUser($v,$u,$t)
	{
		if($t == TWITTER_UID)
			{ $v["user_id"] = $u; }
		elseif($t == TWITTER_SN)
			{ $v["screen_name"] = $u; }
		else
			{ $v["id"] = $u; }
		return $v;
	}
	
	// Search
	public function search($q,$since_id = null,$lang = null,$locale = null,$geocode = null,$rpp = null,$page = null,$show_user = null)
	{
		throw Exception("No Support for UnAuthenticated Requests, yet.");
		/*
		$vars = array();
		$vars["q"] = $q;
		if($since_id)
			{ $vars["since_id"] = $since_id; }
		if($lang)
			{ $vars["lang"] = $lang; }
		if($locale)
			{ $vars["locale"] = $locale; }
		if($geocode)
			{ $vars["geocode"] = $geocode; }
		if($rpp)
			{ $vars["rpp"] = $rpp; }
		if($page)
			{ $vars["page"] = $page; }
		if($show_user)
			{ $vars["show_user"] = $show_user; }
		$this->searchMethod("search",$vars);
		*/
	}
	
	// Timeline
	public function statuses_publicTimeline()
	{
		return $this->callMethod("statuses/public_timeline");
	}
	public function statuses_homeTimeline($since_id = null,$max_id = null,$count = null,$page = null)
	{
		$vars = array();
		if($since_id)
			{ $vars["since_id"] = $since_id; }
		if($max_id)
			{ $vars["max_id"] = $max_id; }
		if($count)
			{ $vars["count"] = $count; }
		if($page)
			{ $vars["page"] = $page; }

		return $this->callMethod("statuses/home_timeline");
	}
	public function statuses_friendsTimeline($since_id = null,$max_id = null,$count = null,$page = null)
	{
		$vars = array();
		if($since_id)
			{ $vars["since_id"] = $since_id; }
		if($max_id)
			{ $vars["max_id"] = $max_id; }
		if($count)
			{ $vars["count"] = $count; }
		if($page)
			{ $vars["page"] = $page; }
		
		return $this->callMethod("statuses/friends_timeline");
	}
	public function statuses_userTimeline($u,$type = TWITTER_ID,$since_id = null,$max_id = null,$count = null,$page = null)
	{
		$vars = array();
		$vars = $this->addUser($vars,$u,$type);
		if($since_id)
			{ $vars["since_id"] = $since_id; }
		if($max_id)
			{ $vars["max_id"] = $max_id; }
		if($count)
			{ $vars["count"] = $count; }
		if($page)
			{ $vars["page"] = $page; }
		return $this->callMethod("statuses/user_timeline",$vars);
	}
	public function statuses_mentions($since_id = null,$max_id = null,$count = null,$page = null)
	{
		$vars = array();
		if($since_id)
			{ $vars["since_id"] = $since_id; }
		if($max_id)
			{ $vars["max_id"] = $max_id; }
		if($count)
			{ $vars["count"] = $count; }
		if($page)
			{ $vars["page"] = $page; }
		return $this->callMethod("statuses/mentions",$vars);
	}
	public function statuses_retweetedByMe($since_id = null,$max_id = null,$count = null,$page = null)
	{
		$vars = array();
		if($since_id)
			{ $vars["since_id"] = $since_id; }
		if($max_id)
			{ $vars["max_id"] = $max_id; }
		if($count)
			{ $vars["count"] = $count; }
		if($page)
			{ $vars["page"] = $page; }
		return $this->callMethod("statuses/retweeted_by_me",$vars);
	}
	public function statuses_retweetedToMe($since_id = null,$max_id = null,$count = null,$page = null)
	{
		$vars = array();
		if($since_id)
			{ $vars["since_id"] = $since_id; }
		if($max_id)
			{ $vars["max_id"] = $max_id; }
		if($count)
			{ $vars["count"] = $count; }
		if($page)
			{ $vars["page"] = $page; }
		return $this->callMethod("statuses/retweeted_to_me",$vars);
	}
	public function statuses_retweetsOfMe($since_id = null,$max_id = null,$count = null,$page = null)
	{
		$vars = array();
		if($since_id)
			{ $vars["since_id"] = $since_id; }
		if($max_id)
			{ $vars["max_id"] = $max_id; }
		if($count)
			{ $vars["count"] = $count; }
		if($page)
			{ $vars["page"] = $page; }
		return $this->callMethod("statuses/retweets_of_me",$vars);
	}
	// Status Methods
	public function statuses_show($id)
	{
		return $this->callMethod("statuses/show",array("id"=>$id));
	}
	public function statuses_update($status,$reply_to = null,$lat = null,$long = null)
	{
		$vars = array();
		$vars["status"] = $status;
		if($reply_to)
			{ $vars["in_reply_to_status_id"] = $reply_to; }
		if($lat)
			{ $vars["lat"] = $lat; }
		if($long)
			{ $vars["long"] = $long; }
		return $this->callMethod("statuses/update",$vars,"POST");
	}
	public function statuses_destroy($id)
	{
		return $this->callMethod("statuses/destroy",array("id"=>$id),"POST");
	}
	public function statuses_retweet($id)
	{
		return $this->callMethod("statuses/retweet",array("id"=>$id),"POST");
	}
	public function statuses_retweets($id,$count = null)
	{
		$vars = array();
		$vars["id"] = $id;
		if($count)
			{ $vars["count"] = $count; }
		return $this->callmethod("statuses/retweets",$vars);
	}
	
	// Users
	public function users_show($u,$type = TWITTER_ID)
	{
		$vars = array();
		$vars = $this->addUser($vars,$u,$type);
		return $this->callMethod("users/show",$vars);
	}
	public function users_friends($a = null,$b = null,$c = null,$d = null)
		{ return $this->statuses_friends($a,$b,$c,$d); }
	public function statuses_friends($u,$type = TWITTER_ID,$cursor = null)
	{
		$vars = array();
		$vars = $this->addUser($vars,$u,$type);
		if($cursor)
			{ $vars["cursor"] = $cursor; }
		return $this->callMethod("statuses/friends",$vars);
	}
	public function users_followers($a = null,$b = null,$c = null,$d = null)
		{ return $this->statuses_followers($a,$b,$c,$d); }
	public function statuses_followers($u,$type = TWITTER_ID,$cursor = null)
	{
		$vars = array();
		$vars = $this->addUser($vars,$u,$type);
		if($cursor)
			{ $vars["cursor"] = $cursor; }
		return $this->callMethod("statuses/followers",$vars);
	}
	
	// Direct Messages
	public function direct_messages($a = null,$b = null,$c = null,$d = null)
		{ return $this->dm($a,$b,$c,$d); }
	public function dms($since_id = null,$max_id = null,$count = null,$page = null)
	{
		$vars = array();
		if($since_id)
			{ $vars["since_id"] = $since_id; }
		if($max_id)
			{ $vars["max_id"] = $max_id; }
		if($count)
			{ $vars["count"] = $count; }
		if($page)
			{ $vars["page"] = $page; }
		return $this->callMethod("direct_messages",$vars);
	}
	public function dms_sent($since_id = null,$max_id = null,$count = null,$page = null)
	{
		$vars = array();
		if($since_id)
			{ $vars["since_id"] = $since_id; }
		if($max_id)
			{ $vars["max_id"] = $max_id; }
		if($count)
			{ $vars["count"] = $count; }
		if($page)
			{ $vars["page"] = $page; }
		return $this->callMethod("direct_messages/sent",$vars);
	}
	public function dms_new($text,$u,$type = TWITTER_ID)
	{
		$vars = array();
		$vars["text"] = $text;
		$vars = $this->addUser($vars,$u,$type);
		return $this->callMethod("direct_messages/new",$vars,"POST");
	}
	public function dms_destroy($id)
	{
		return $this->callMethod("direct_messages/destroy",array("id"=>$id),"POST");
	}

	// Friendship Methods
	public function friendships_create($u,$type = TWITTER_ID,$follow = null)
	{
		$vars = array();
		$vars = $this->addUser($vars,$u,$type);
		if($follow)
			{ $vars["follow"] = $follow; }
		return $this->callMethod("friendships/create",$vars,"POST");
	}
	public function friendships_destroy($u,$type = TWITTER_ID)
	{
		$vars = array();
		$call = "";
		$vars = $this->addUser($vars,$u,$type);
		return $this->callMethod("friendships/destroy",$vars,"POST");
	}
	public function friendships_exists($user_a,$user_b)
	{
		return $this->callMethod("friendships/exists",array("user_a"=>$user_a,"user_b"=>$user_b),"GET");
	}
	public function friendships_show($target_id = null,$target_sn = null,$source_id = null,$source_sn = null)
	{
		$vars = array();
		if($target_id)
			{ $vars["target_id"] = $target_id; }
		elseif($target_sn)
			{ $vars["target_screen_name"] = $target_sn; }
		else
			{ throw Exception("User ID or Screen Name Required."); }
		if($source_id)
			{ $vars["source_id"] = $source_id; }
		elseif($source_sn)
			{ $vars["source_screen_name"] = $source_sn; }
		return $this->callMethod("friendships/show",$vars);
	}

	// Social Graphs
	public function friends_ids($u,$type = TWITTER_ID,$cursor = null)
	{
		$vars = array();
		$vars = $this->addUser($vars,$u,$type);
		if($cursor)
			{ $vars["cursor"] = $cursor; }
		return $this->callMethod("friends/ids",$vars);
	}
	public function followers_ids($u,$type = TWITTER_ID,$cusor = null)
	{
		$vars = array();
		$vars = $this->addUser($vars,$u,$type);
		if($cursor)
			{ $vars["cursor"] = $cursor; }
		return $this->callMethod("followers/ids",$vars);
	}

	// Account
	public function account_verifyCredentials()
	{
		return $this->callMethod("account/verify_credentials");
	}
	public function account_rateLimitStatus()
	{
		return $this->callMethod("account/rate_limit_status");
	}
	public function account_endSession()
	{
		return $this->callMethod("account/end_session",null,"POST");
	}
	public function account_updateDeliveryDevice($device = null)
	{
		if($device === null) { throw Exception("Device Required."); }
		return $this->callMethod("account/update_delivery_device",array("device"=>$device),"POST");
	}
	public function account_updateProfileColors($bgColor = null,$txtColor = null,$linkColor = null,$sidebarFill = null,$sidebarBorder = null)
	{
		$vars = array();
		if($bgColor)
			{ $vars["profile_background_color"] = $bgColor; }
		if($txtColor)
			{ $vars["profile_text_color"] = $txtColor; }
		if($linkColor)
			{ $vars["profile_link_color"] = $linkColor; }
		if($sidebarFill)
			{ $vars["profile_sidebar_fill_color"] = $sidebarFill; }
		if($sidebarBorder)
			{ $vars["profile_sidebar_border_color"] = $sidebarBorder; }
		return $this->callMethod("account/update_profile_colors",$vars,"POST");
	}
	public function account_updateProfileImage($image = null)
	{
		if($image === null) { throw Exception("Image Required"); }
		return $this->callMethod("account/update_profile_image",array("image"=>$image),"POST");
	}
	public function account_updateProfileBackgroundImage($image = null,$tile = null)
	{
		$vars = array();
		if($image === null) { throw Exception("Image Required"); }
		else { $vars["image"] = $image; }
		if($tile !== null) { $vars["tile"] = $tile; }
		return $this->callMethod("account/update_profile_background_image",$vars,"POST");
	}
	public function account_updateProfile($name = null,$url = null,$location = null,$description = null)
	{
		$vars = array();
		if($name)
			{ $vars["name"] = $name; }
		if($url)
			{ $vars["url"] = $url; }
		if($location)
			{ $vars["location"] = $location; }
		if($description)
			{ $vars["description"] = $description; }

		return $this->callMethod("account/update_profile",$vars,"POST");
	}

	// Favorite
	public function favorites_view($id = null,$page = null)
		{ return $this->favorites($id,$page); }
	public function favorites($id = null,$page = null)
	{
		$vars = array();
		if($id)
			{ $vars["id"] = $id; }
		if($page)
			{ $vars["page"] = $page; }

		return  $this->callMethod("favorites",$vars);
	}
	public function favorites_create($id)
	{
		return $this->callMethod("favorites/create/$id",null,"POST");
	}
	public function favorites_destroy($id)
	{
		return $this->callMethod("favorites/destroy/$id",null,"POST");
	}

	// Notifications
	public function notifications_follow($u,$type = TWITTER_ID)
	{
		$vars = array();
		$vars = $this->addUser($vars,$u,$type);
		return $this->callMethod("notifications/follow",$vars,"POST");
	}
	public function notifications_leave($u,$type = TWITTER_ID)
	{
		$vars = array();
		$vars = $this->addUser($vars,$u,$type);
		return $this->callMethod("notifications/leave",$vars,"POST");
	}

	// Blocks
	public function blocks_create($u,$type = TWITTER_ID)
	{
		$vars = array();
		$vars = $this->addUser($vars,$u,$type);
		return $this->callMethod("blocks/create",$vars,"POST");
	}
	public function blocks_destroy($u,$type = TWITTER_ID)
	{
		$vars = array();
		$vars = $this->addUser($vars,$u,$type);
		return $this->callMethod("blocks/destroy",$vars,"POST");
	}
	public function blocks_exist($u,$type = TWITTER_ID)
	{
		$vars = array();
		$vars = $this->addUser($vars,$u,$type);
		return $this->callMethod("blocks/exists",$vars);
	}
	public function blocks_blocking($page = null)
	{
		$vars = array();
		if($page)
			{ $vars["page"] = $page; }
		return $this->callMethod("blocks/blocking",$vars);
	}
	public function blocks_blockingIDs()
	{
		return $this->callMethod("blocks/blocking_ids");
	}
	
	// Spam
	public function report_spam($u,$type = TWITTER_ID)
	{
		$vars = array();
		$vars = $this->addUser($vars,$u,$type);
		return $this->callMethod("report_spam",$vars,"POST");
	}
	
	// Saved Searches
	public function saved_searches()
		{ return $this->searches_view(); }
	public function searches_view()
	{
		return $this->callMethod("saved_searches");
	}
	public function searches_show($id)
	{
		return $this->callMethod("saved_searches/show/$id");
	}
	public function searches_create($query)
	{
		return $this->callMethod("saved_searches/create",array("query"=>$query),"POST");
	}
	public function searches_destroy($id)
	{
		return $this->callMethod("saved_searches/destroy/$id",null,"POST");
	}

	// Help
	public function test()
	{
		return $this->callMethod("help/test");
	}

	protected function callMethod($method,$vars = null,$type = null)
	{
		if($vars === null) { $vars = array(); }
		if($type === null) { $type = "GET"; }
		else { $type = strtoupper($type); }
		$uri = "https://twitter.com/".$method.".json";
		return json_decode($this->auth->OAuthRequest($uri,$vars,$type),true);
	}
}

// Definitions
	define("TWITTER_ID",1);
	define("TWITTER_UID",2);
	define("TWITTER_SN",3);

// Crazy Ass Twitter OAuth Non-Callback Workaround
	if(!session_id()) { session_start(); }
	header("X-Twitter-API: Navarr's");
	if($_SESSION["TWITTERAPI_vars"]["RETURN_TO"] == 1)
	{
		$_SESSION["TWITTERAPI_vars"]["RETURN_TO"] = 0;
		unset($_SESSION["TWITTERAPI_vars"]["RETURN_TO"]);
		session_write_close();
		session_regenerate_id();
		$url = $_SESSION["TWITTERAPI_vars"]["RETURN_URI"];
		if(strpos($url,"?") !== FALSE) { $url .= "&".$_SERVER["argv"]; }
		else { $url .= "?".$_SERVER["argv"][0]; }
		header("Location: $url");
	}


?>
<?php
/*
 * Abraham Williams (abraham@abrah.am) http://abrah.am
 *
 * Basic lib to work with Twitter's OAuth beta. This is untested and should not
 * be used in production code. Twitter's beta could change at anytime.
 *
 * Code based on:
 * Fire Eagle code - http://github.com/myelin/fireeagle-php-lib
 * twitterlibphp - http://github.com/poseurtech/twitterlibphp
 */

/* 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 */
  private $http_status;

  /* Contains the last API call */
  private $last_api_call;

  /* Set up the API root URL */
  public static $TO_API_ROOT = "https://twitter.com";

  /**
   * Set API URLS
   */
  function requestTokenURL() { return self::$TO_API_ROOT.'/oauth/request_token'; }
  function authorizeURL() { return self::$TO_API_ROOT.'/oauth/authorize'; }
  function accessTokenURL() { return self::$TO_API_ROOT.'/oauth/access_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() {/*{{{*/
    $r = $this->oAuthRequest($this->requestTokenURL());
    $token = $this->oAuthParseResponse($r);
    $this->token = new OAuthConsumer($token['oauth_token'], $token['oauth_token_secret']);
    return $token;
  }/*}}}*/

  /**
   * Parse a URL-encoded OAuth response
   *
   * @return a key/value array
   */
  function oAuthParseResponse($responseString) {
    $r = array();
    foreach (explode('&', $responseString) as $param) {
      $pair = explode('=', $param, 2);
      if (count($pair) != 2) continue;
      $r[urldecode($pair[0])] = urldecode($pair[1]);
    }
    return $r;
  }

  /**
   * Get the authorize URL
   *
   * @returns a string
   */
  function getAuthorizeURL($token) {/*{{{*/
    if (is_array($token)) $token = $token['oauth_token'];
    return $this->authorizeURL() . '?oauth_token=' . $token;
  }/*}}}*/

  /**
   * Exchange the 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)
   */
  function getAccessToken($token = NULL) {/*{{{*/
    $r = $this->oAuthRequest($this->accessTokenURL());
    $token = $this->oAuthParseResponse($r);
    $this->token = new OAuthConsumer($token['oauth_token'], $token['oauth_token_secret']);
    return $token;
  }/*}}}*/

  /**
   * Format and sign an OAuth / API request
   */
  function oAuthRequest($url, $args = array(), $method = NULL) {/*{{{*/
    if (empty($method)) $method = empty($args) ? "GET" : "POST";
    $req = OAuthRequest::from_consumer_and_token($this->consumer, $this->token, $method, $url, $args);
    $req->sign_request($this->sha1_method, $this->consumer, $this->token);
    switch ($method) {
    case 'GET': return $this->http($req->to_url());
    case 'POST': return $this->http($req->get_normalized_http_url(), $req->to_postdata());
    }
  }/*}}}*/

  /**
   * Make an HTTP request
   *
   * @return API results
   */
  function http($url, $post_data = null) {/*{{{*/
    $ch = curl_init();
    if (defined("CURL_CA_BUNDLE_PATH")) curl_setopt($ch, CURLOPT_CAINFO, CURL_CA_BUNDLE_PATH);
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 30);
    curl_setopt($ch, CURLOPT_TIMEOUT, 30);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    //////////////////////////////////////////////////
    ///// Set to 1 to verify Twitter's SSL Cert //////
    //////////////////////////////////////////////////
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);
    if (isset($post_data)) {
      curl_setopt($ch, CURLOPT_POST, 1);
      curl_setopt($ch, CURLOPT_POSTFIELDS, $post_data);
    }
    $response = curl_exec($ch);
    $this->http_status = curl_getinfo($ch, CURLINFO_HTTP_CODE);
    $this->last_api_call = $url;
    curl_close ($ch);
    return $response;
  }/*}}}*/
}/*}}}*/
?>

<?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();
  }
}

class OAuthSignatureMethod {
  public function check_signature(&$request, $consumer, $token, $signature) {
    $built = $this->build_signature($request, $consumer, $token);
    return $built == $signature;
  }
}

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));
  }
}

class OAuthSignatureMethod_PLAINTEXT extends OAuthSignatureMethod {
  public function get_name() {
    return "PLAINTEXT";
  }

  public function build_signature($request, $consumer, $token) {
    $sig = array(
      OAuthUtil::urlencode_rfc3986($consumer->secret)
    );

    if ($token) {
      array_push($sig, OAuthUtil::urlencode_rfc3986($token->secret));
    } else {
      array_push($sig, '');
    }

    $raw = implode("&", $sig);
    // for debug purposes
    $request->base_string = $raw;

    return OAuthUtil::urlencode_rfc3986($raw);
  }
}

class OAuthSignatureMethod_RSA_SHA1 extends OAuthSignatureMethod {
  public function get_name() {
    return "RSA-SHA1";
  }

  protected function fetch_public_cert(&$request) {
    // not implemented yet, 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
    throw Exception("fetch_public_cert not implemented");
  }

  protected function fetch_private_cert(&$request) {
    // not implemented yet, 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
    throw Exception("fetch_private_cert not implemented");
  }

  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();
    $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() {
    $out ='Authorization: OAuth realm=""';
    $total = array();
    foreach ($this->parameters as $k => $v) {
      if (substr($k, 0, 5) != "oauth") continue;
      if (is_array($v)) {
        throw new OAuthException('Arrays not supported in headers');
      }
      $out .= ',' .
              OAuthUtil::urlencode_rfc3986($k) .
              '="' .
              OAuthUtil::urlencode_rfc3986($v) .
              '"';
    }
    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);

    $new_token = $this->data_store->new_request_token($consumer);

    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);

    $new_token = $this->data_store->new_access_token($token, $consumer);

    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) {
      $version = 1.0;
    }
    if ($version && $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) {
      $signature_method = "PLAINTEXT";
    }
    if (!in_array($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) {
    // verify that timestamp is recentish
    $now = time();
    if ($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) {
    // 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) {
    // return a new token attached to this consumer
  }

  function new_access_token($token, $consumer) {
    // 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
      return apache_request_headers();
    }
    // otherwise we don't have apache and are just going to have to hope
    // that $_SERVER actually contains what we need
    $out = array();
    foreach ($_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 = split('&', $input);

    $parsed_parameters = array();
    foreach ($pairs as $pair) {
      $split = split('=', $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);
  }
}

?>