<?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
 */
if (!class_exists('TwitterOAuthChat')) {
	class TwitterOAuthChat {
  		/* 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 OAuthSignatureMethodChat_HMAC_SHA1();
    		$this->consumer = new OAuthConsumerChat($consumer_key, $consumer_secret);
    		if (!empty($oauth_token) && !empty($oauth_token_secret)) {
      			$this->token = new OAuthConsumerChat($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);
    		$token = OAuthUtilChat::parse_parameters($request);
    		$this->token = new OAuthConsumerChat($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);
    		$token = OAuthUtilChat::parse_parameters($request);
    		$this->token = new OAuthConsumerChat($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);
    		$token = OAuthUtilChat::parse_parameters($request);
    		$this->token = new OAuthConsumerChat($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}";
    		}
    		$request = OAuthRequestChat::from_consumer_and_token($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);
  		}
	}
}