firebaseLib.php

<?php

/**
 * Firebase PHP Client Library
 *
 * @author Tamas Kalman <ktamas77@gmail.com>
 * @link   https://www.firebase.com/docs/rest-api.html
 * 
 */

/**
 * Firebase PHP Class
 *
 * @author Tamas Kalman <ktamas77@gmail.com>
 * @link   https://www.firebase.com/docs/rest-api.html
 *
 */
class Firebase
{

    private $_baseURI;
    private $_timeout;

    /**
     * Constructor
     *
     * @param String $baseURI Base URI
     *
     * @return void
     */
    function __construct($baseURI = '')
    {
        if (!extension_loaded('curl')) {
            trigger_error('Extension CURL is not loaded.', E_USER_ERROR);
        }

        $this->setBaseURI($baseURI);
        $this->setTimeOut(10);
    }

    /**
     * Sets Base URI, ex: http://yourcompany.firebase.com/youruser
     *
     * @param String $baseURI Base URI
     *
     * @return void
     */
    public function setBaseURI($baseURI)
    {
        $baseURI .= (substr($baseURI, -1) == '/' ? '' : '/');
        $this->_baseURI = $baseURI;
    }

    /**
     * Returns with the normalized JSON absolute path
     *
     * @param String $path to data
     */
    private function _getJsonPath($path)
    {
        $url = $this->_baseURI;
        $path = ltrim($path, '/');
        return sprintf($url . $path . '.json');
    }

    /**
     * Sets REST call timeout in seconds
     *
     * @param Integer $seconds Seconds to timeout
     *
     * @return void
     */
    public function setTimeOut($seconds)
    {
        $this->_timeout = $seconds;
    }

    /**
     * Writing data into Firebase with a PUT request
     * HTTP 200: Ok
     * 
     * @param String $path Path
     * @param Mixed  $data Data
     *
     * @return Array Response
     */
    public function set($path, $data)
    {
        $jsonData = json_encode($data);
        $header = array(
            'Content-Type: application/json',
            'Content-Length: ' . strlen($jsonData)
        );
        try {
            $ch = $this->_getCurlHandler($path, 'PUT');
            curl_setopt($ch, CURLOPT_HTTPHEADER, $header);
            curl_setopt($ch, CURLOPT_POSTFIELDS, $jsonData);
            $return = curl_exec($ch);
            curl_close($ch);
        } catch (Exception $e) {
            $return = null;
        }
        return $return;
    }

    /**
     * Reading data from Firebase
     * HTTP 200: Ok
     *
     * @param String $path Path
     *
     * @return Array Response
     */
    public function get($path)
    {
        try {
            $ch = $this->_getCurlHandler($path, 'GET');
            $return = curl_exec($ch);
            curl_close($ch);
        } catch (Exception $e) {
            $return = null;
        }
        return $return;
    }

    /**
     * Deletes data from Firebase
     * HTTP 204: Ok
     *
     * @param type $path Path
     *
     * @return Array Response
     */
    public function delete($path)
    {
        try {
            $ch = $this->_getCurlHandler($path, 'DELETE');
            $return = curl_exec($ch);
            curl_close($ch);
        } catch (Exception $e) {
            $return = null;
        }
        return $return;
    }

    /**
     * Returns with Initialized CURL Handler
     *
     * @param String $mode Mode
     *
     * @return CURL Curl Handler
     */
    private function _getCurlHandler($path, $mode)
    {
        $url = $this->_getJsonPath($path);
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_TIMEOUT, $this->_timeout);
        curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $this->_timeout);
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_CUSTOMREQUEST, $mode);
        return $ch;
    }

}