<?php
if ( ! defined( 'ABSPATH' ) ) exit; // Exit if accessed directly

 class bitlyhelper {
			private $bitly_api = 'http://api.bit.ly/v3/';
			private $bitly_oauth_api = 'https://api-ssl.bit.ly/v3/';
			private $bitly_oauth_access_token = 'https://api-ssl.bit.ly/oauth/';

		/**
		 * Returns an OAuth access token as well as API users for a given code.
		 *
		 * @param $code
		 *   The OAuth verification code acquired via OAuth’s web authentication
		 *   protocol.
		 * @param $redirect
		 *   The page to which a user was redirected upon successfully authenticating.
		 * @param $client_id
		 *   The client_id assigned to your OAuth app. (http://bit.ly/a/account)
		 * @param $client_secret
		 *   The client_secret assigned to your OAuth app. (http://bit.ly/a/account)
		 *
		 * @return
		 *   An associative array containing:
		 *   - login: The corresponding bit.ly users username.
		 *   - api_key: The corresponding bit.ly users API key.
		 *   - access_token: The OAuth access token for specified user.
		 *
		 * @see http://code.google.com/p/bitly-api/wiki/ApiDocumentation#/oauth/access_token
		 */
		function bitly_oauth_access_token( $code, $redirect, $client_id, $client_secret ) {
				$results                 = array();
				$url                     = $this->bitly_oauth_access_token . "access_token";
				$params                  = array();
				$params['client_id']     = $client_id;
				$params['client_secret'] = $client_secret;
				$params['code']          = $code;
				$params['redirect_uri']  = $redirect;
				$output                  = $this->bitly_post_curl( $url, $params );
				$parts                   = explode( '&', $output );
				foreach ( $parts as $part ) {
						$bits                = explode( '=', $part );
						$results[ $bits[0] ] = $bits[1];
				}

				return $results;
		}

		/**
		 * Returns an OAuth access token via the user's bit.ly login Username and Password
		 *
		 * @param $username
		 *   The user's Bitly username
		 * @param $password
		 *   The user's Bitly password
		 * @param $client_id
		 *   The client_id assigned to your OAuth app. (http://bit.ly/a/account)
		 * @param $client_secret
		 *   The client_secret assigned to your OAuth app. (http://bit.ly/a/account)
		 *
		 * @return
		 *   An associative array containing:
		 *   - access_token: The OAuth access token for specified user.
		 *
		 */

		function bitly_oauth_access_token_via_password( $username, $password, $client_id, $client_secret ) {
				$results = array();
				$url     = $this->bitly_oauth_access_token . "access_token";

				$headers   = array();
				$headers[] = 'Authorization: Basic ' . base64_encode( $client_id . ":" . $client_secret );

				$params               = array();
				$params['grant_type'] = "password";
				$params['username']   = $username;
				$params['password']   = $password;

				$output = $this->bitly_post_curl( $url, $params, $headers );

				$decoded_output = json_decode( $output, 1 );

				$results = array(
						"access_token" => $decoded_output['access_token']
				);

				return $results;
		}

		/**
		 * Format a GET call to the bit.ly API.
		 *
		 * @param $endpoint
		 *   bit.ly API endpoint to call.
		 * @param $params
		 *   associative array of params related to this call.
		 * @param $complex
		 *   set to true if params includes associative arrays itself (or using <php5)
		 *
		 * @return
		 *   associative array of bit.ly response
		 *
		 * @see http://code.google.com/p/bitly-api/wiki/ApiDocumentation#/v3/validate
		 */
		public function bitly_get( $endpoint, $params, $complex = false ) {
				$result = array();
				if ( $complex ) {
						$url_params = "";
						foreach ( $params as $key => $val ) {
								if ( is_array( $val ) ) {
										// we need to flatten this into one proper command
										$recs = array();
										foreach ( $val as $rec ) {
												$tmp = explode( '/', $rec );
												$tmp = array_reverse( $tmp );
												array_push( $recs, $tmp[0] );
										}
										$val = implode( '&' . $key . '=', $recs );
								}
								$url_params .= '&' . $key . "=" . $val;
						}
						$url = $this->bitly_oauth_api . $endpoint . "?" . substr( $url_params, 1 );
				} else {
						$url = $this->bitly_oauth_api . $endpoint . "?" . http_build_query( $params );
				}

				//echo $url . "\n";

				$result = json_decode( $this->bitly_get_curl( $url ), true );

				return $result;
		}

		/**
		 * Format a POST call to the bit.ly API.
		 *
		 * @param $uri
		 *   URI to call.
		 * @param $fields
		 *   Array of fields to send.
		 */
		function bitly_post( $api_endpoint, $params ) {
				$result                = array();
				$url                   = $this->bitly_oauth_api . $api_endpoint;
				$output                = json_decode( $this->bitly_post_curl( $url, $params ), true );
				$result                = $output['data'][ str_replace( '/', '_', $api_endpoint ) ];
				$result['status_code'] = $output['status_code'];

				return $result;
		}

		/**
		 * Make a GET call to the bit.ly API.
		 *
		 * @param $uri
		 *   URI to call.
		 */
		function bitly_get_curl( $uri ) {
				$output = "";
				try {
						$ch = curl_init( $uri );
						curl_setopt( $ch, CURLOPT_HEADER, 0 );
						curl_setopt( $ch, CURLOPT_TIMEOUT, 4 );
						curl_setopt( $ch, CURLOPT_CONNECTTIMEOUT, 2 );
						curl_setopt( $ch, CURLOPT_FOLLOWLOCATION, 1 );
						curl_setopt( $ch, CURLOPT_RETURNTRANSFER, 1 );
						curl_setopt( $ch, CURLOPT_SSL_VERIFYPEER, false );
						$output = curl_exec( $ch );
				} catch ( Exception $e ) {
				}

				return $output;
		}

		/**
		 * Make a POST call to the bit.ly API.
		 *
		 * @param $uri
		 *   URI to call.
		 * @param $fields
		 *   Array of fields to send.
		 */
		function bitly_post_curl( $uri, $fields, $header_array = array() ) {
				$output        = "";
				$fields_string = "";
				foreach ( $fields as $key => $value ) {
						$fields_string .= $key . '=' . urlencode( $value ) . '&';
				}
				rtrim( $fields_string, '&' );
				try {
						$ch = curl_init( $uri );

						if ( is_array( $header_array ) && ! empty( $header_array ) ) {
								curl_setopt( $ch, CURLOPT_HTTPHEADER, $header_array );
						}

						curl_setopt( $ch, CURLOPT_HEADER, 0 );
						curl_setopt( $ch, CURLOPT_POST, count( $fields ) );
						curl_setopt( $ch, CURLOPT_POSTFIELDS, $fields_string );
						curl_setopt( $ch, CURLOPT_TIMEOUT, 2 );
						curl_setopt( $ch, CURLOPT_CONNECTTIMEOUT, 2 );
						curl_setopt( $ch, CURLOPT_FOLLOWLOCATION, 1 );
						curl_setopt( $ch, CURLOPT_RETURNTRANSFER, 1 );
						curl_setopt( $ch, CURLOPT_SSL_VERIFYPEER, false );
						$output = curl_exec( $ch );
				} catch ( Exception $e ) {
				}

				return $output;
		}
}


?>