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<?php

/*

 * The 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 = FALSE;

    /* 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. */

    //public $retry = TRUE;

    /**

     * Set API URLS

     */

    function accessTokenURL()  { return 'https://api.twitter.com/oauth/access_token'; }

    function authenticateURL() { return 'https://api.twitter.com/oauth/authenticate'; }

    function authorizeURL()    { return 'https://api.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) {

        $parameters = array();

        $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}&force_login=true";

        }

    }

    /**

     * 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" => "1234567",

     *                "screen_name" => "codexworld")

     */

    function getAccessToken($oauth_verifier) {

        $parameters = array();

        $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" => "1234567",

     *                "screen_name" => "codexworld",

     *                "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);

    }

}