<?php
defined('BASEPATH') OR exit('No direct script access allowed');

/**
 * @file
 * Simple PHP library for interacting with the v3 bit.ly api (only deals with
 * JSON format, but supports new OAuth endpoints).
 * REQUIREMENTS: PHP, Curl, JSON
 * 
 * @link https://github.com/Falicon/BitlyPHP
 * @author Kevin Marshall <info@falicon.com>
 */

/**
 * The URI of the standard bitly v3 API.
 */
define('bitly_api', 'http://api.bit.ly/v3/');

/**
 * The URI of the bitly OAuth endpoints.
 */
define('bitly_oauth_api', 'https://api-ssl.bit.ly/v3/');

/**
 * The URI for OAuth access token requests.
 */
define('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 = 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;
    $output = bitly_post_curl($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 = 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;

    $output = bitly_post_curl($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 $complex
 *   set to true if params includes associative arrays itself (or using <php5)
 *
 * @return
 *   associative array of bit.ly response
 *
 * @see http://code.google.com/p/bitly-api/wiki/ApiDocumentation#/v3/validate
 */
function bitly_get($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 = bitly_oauth_api . $endpoint . "?" . substr($url_params, 1);
    } else {
        $url = bitly_oauth_api . $endpoint . "?" . http_build_query($params);
    }

    //echo $url . "\n";

    $result = json_decode(bitly_get_curl($url), true);

    return $result;
}

/**
 * Format a POST call to the bit.ly API.
 *
 * @param $uri
 *   URI to call.
 * @param $fields
 *   Array of fields to send.
 */
function bitly_post($endpoint, $params) {
    $result = array();
    $url = bitly_oauth_api . $api_endpoint;
    $output = json_decode(bitly_post_curl($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;
}

