<?php
class RESTClient {
    private $with_curl;

    const USER_AGENT = 'RESTClient';

    /*
     * Constructor of the RESTClient
     */
    public function __construct() {
        if (function_exists("curl_init")) {
            $this->with_curl = TRUE;
        } else {
            $this->with_curl = FALSE;
        }
    }

    /*
     * Call the HTTP 'GET' method
     * @param string $url URL of the service.
     * @param array $params request parameters, hash of (key,value) pairs
     * @return response string
     */
    public function get($url, $params) {
        $params_str = "?";
        if (is_array($params)) {
            foreach ($params as $key => $value) {
                $params_str .= urlencode($key) . "=" . urlencode($value) . "&";
            }
        } else {
            $params_str .= $params;
        }

        $url .= $params_str;

        $result = "";

        if ($this->with_curl) {
            $curl = curl_init();
            curl_setopt($curl, CURLOPT_URL, $url);
            curl_setopt($curl, CURLOPT_HTTPGET, TRUE);
            curl_setopt($curl, CURLOPT_USERAGENT, RESTClient :: USER_AGENT);
            curl_setopt($curl, CURLOPT_RETURNTRANSFER, TRUE);
            $result = curl_exec($curl);
            curl_close($curl);
        } else {
            $opts = array (
                'http' => array (
                    'method' => "GET",
                    'header' => "User-Agent: " . RESTClient :: USER_AGENT . "\r\n"
                )
            );

            $context = stream_context_create($opts);

            $fp = fopen($url, 'r', false, $context);
            $result = fpassthru($fp);
            fclose($fp);
        }

        return $result;
    }

    /*
     * Call the HTTP 'POST' method
     * @param string $url URL of the service..
     * @param string $data request data
     * @param array $content_type the http content type
     * @return response string
     */
    public function post($url, $data, $content_type = "application/x-www-form-urlencoded") {
        $result = "";

        if ($this->with_curl) {
            $curl = curl_init();
            curl_setopt($curl, CURLOPT_HTTPHEADER, Array (
                "Content-Type: " . $content_type
            ));
            curl_setopt($curl, CURLOPT_URL, $url);
            curl_setopt($curl, CURLOPT_POST, TRUE);
            curl_setopt($curl, CURLOPT_POSTFIELDS, $data);
            curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
            curl_setopt($curl, CURLOPT_USERAGENT, RESTClient :: USER_AGENT);
            $result = curl_exec($curl);
            curl_close($curl);
        } else {
            $opts = array (
                'http' => array (
                    'method' => "POST",
                    'header' => "User-Agent: " . RESTClient :: USER_AGENT . "\r\n" .
                    "Content-Type: " . $content_type . "\r\n" .
                    "Content-length: " . strlen($data
                ) . "\r\n",
                'content' => $data
            ));

            $context = stream_context_create($opts);

            $fp = fopen($url, 'r', false, $context);
            $result = fpassthru($fp);
            fclose($fp);
        }

        return $result;
    }

    /*
     * Call the HTTP 'PUT' method
     * @param string $url URL of the service..
     * @param string $data request data
     * @return response string
     */
    public function put($url, $data) {
        $result = "";

        if ($this->with_curl) {

            $fh = fopen('php://memory', 'rw');
            fwrite($fh, $data);
            rewind($fh);

            $curl = curl_init();

            curl_setopt($curl, CURLOPT_USERAGENT, RESTClient :: USER_AGENT);
            curl_setopt($curl, CURLOPT_INFILE, $fh);
            curl_setopt($curl, CURLOPT_INFILESIZE, strlen($data));
            curl_setopt($curl, CURLOPT_TIMEOUT, 10);
            curl_setopt($curl, CURLOPT_PUT, 1);
            curl_setopt($curl, CURLOPT_URL, $url);
            curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
            $result = curl_exec($curl);
            curl_close($curl);

            fclose($fh);
        } else {
            $opts = array (
                'http' => array (
                    'method' => "PUT",
                    'header' => "User-Agent: " . RESTClient :: USER_AGENT . "\r\n" .
                    "Content-Type: " . $content_type . "\r\n" .
                    "Content-length: " . strlen($data
                ) . "\r\n",
                'content' => $data
            ));

            $context = stream_context_create($opts);

            $fp = fopen($url, 'r', false, $context);
            $result = fpassthru($fp);
            fclose($fp);
        }

        return $result;
    }

    /*
     * Call the HTTP 'DELETE' method
     * @param string $url URL of the service..
     * @param array $params request parameters, hash of (key,value) pairs
     */
    public function delete($url, $params) {
        $params_str = "?";
        if (is_array($params)) {
            foreach ($params as $key => $value) {
                $params_str .= urlencode($key) . "=" . urlencode($value) . "&";
            }
        } else {
            $params_str .= $params;
        }

        $url .= $params_str;

        $result = "";

        if ($this->with_curl) {
            $curl = curl_init();
            curl_setopt($curl, CURLOPT_URL, $url);
            curl_setopt($curl, CURLOPT_CUSTOMREQUEST, "delete");
            curl_setopt($curl, CURLOPT_USERAGENT, RESTClient :: USER_AGENT);
            $result = curl_exec($curl);
            curl_close($curl);
        } else {
            $opts = array (
                'http' => array (
                    'method' => "DELETE",
                    'header' => "User-Agent: " . RESTClient :: USER_AGENT . "\r\n"
                )
            );

            $context = stream_context_create($opts);

            $fp = fopen($url, 'r', false, $context);
            $result = fpassthru($fp);
            fclose($fp);

        }

    }

}
?>