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<?php
/**
* Handles all REST requests and responses
*
* @package modx
* @subpackage rest
*/
/**
* The basic REST client for handling REST requests
*
* @package modx
* @subpackage rest
*/
class modRestClient {
/**
* @const The path of the request
*/
const OPT_PATH = 'path';
/**
* @const The port of the request
*/
const OPT_PORT = 'port';
/**
* @const The response class to use when generating the response object
*/
const OPT_RESPONSE_CLASS = 'restResponse.class';
/**
* @const The number of seconds before the request times out
*/
const OPT_TIMEOUT = 'timeout';
/**
* @const The user-agent sent in the request
*/
const OPT_USERAGENT = 'userAgent';
/**
* @const The user password to send with the request
*/
const OPT_USERPWD = 'userpwd';
/**
* @const The authentication type for the request
*/
const OPT_AUTHTYPE = 'authtype';
/**
* @var modX $modx A reference to the modX instance.
* @access public
*/
public $modx = null;
/**
* @var array $config The configuration array.
* @access public
*/
public $config = array();
/**
* @var modRestClient $conn The client connection instance to use.
* @access public
*/
public $conn = null;
/**
* @var modRestResponse $response The response object after a request is
* made.
* @access public
*/
public $response = null;
/**
* @access public
* @var string The expected response type
*/
public $responseType = 'xml';
/**
* The current host to connect to
* @var string $host
*/
public $host;
/**
* The constructor for the modRestClient class. Assigns a modX instance
* reference and sets up the basic config array.
*
* @param modX &$modx A reference to the modX instance.
* @param array $config An array of configuration options.
* @return modRestClient
*/
function __construct(modX &$modx,array $config = array()) {
$this->modx =& $modx;
$this->config = array_merge(array(
modRestClient::OPT_PORT => 80,
modRestClient::OPT_TIMEOUT => 30,
modRestClient::OPT_PATH => '/',
modRestClient::OPT_USERAGENT => "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 1.0.3705; .NET CLR 1.1.4322; Media Center PC 4.0)"
),$config);
}
/**
* Get the connection class for the client. Defaults to cURL, then
* fsockopen. If neither exists, returns false.
*
* @access public
* @return boolean True if a connection can be made.
*/
public function getConnection() {
$className = false;
if (function_exists('curl_init')) {
$className = $this->modx->loadClass('rest.modRestCurlClient','',false,true);
} else if (function_exists('fsockopen')) {
$className = $this->modx->loadClass('rest.modRestSockClient','',false,true);
}
if (!empty($className)) {
$this->conn = new $className($this->modx,$this->config);
}
return is_object($this->conn);
}
/**
* Send a REST request
*
* @access public
* @param string $host The host of the REST server.
* @param string $path The path to request to on the REST server.
* @param string $method The HTTP method to use for the request. May be GET,
* PUT or POST.
* @param array $params An array of parameters to send with the request.
* @param array $options An array of options to pass to the request.
* @return modRestResponse The response object.
*/
public function request($host,$path,$method = 'GET',array $params = array(),array $options = array()) {
if (!is_object($this->conn)) {
$loaded = $this->getConnection();
if (!$loaded) return false;
}
$this->host = $host;
$response = $this->conn->request($this->host,$path,$method,$params,$options);
$responseClass = $this->modx->getOption(modRestClient::OPT_RESPONSE_CLASS,$this->config,'modRestResponse');
$this->response = new $responseClass($this,$response,$this->responseType);
return $this->response;
}
/**
* Sets the response type
*
* @param string $type The type to set, either json or xml
*/
public function setResponseType($type) {
$this->responseType = $type;
}
/**
* Translates a SimpleXMLElement object into an array.
*
* @access public
* @param SimpleXMLElement $obj
* @param array &$arr The reference array to store the results in.
* @return boolean True if successful.
*/
public function xml2array($obj, &$arr) {
if (!($obj instanceof SimpleXMLElement)) return false;
$children = $obj->children();
foreach ($children as $elementName => $node)
{
$nextIdx = count($arr);
$arr[$nextIdx] = array();
$arr[$nextIdx]['name'] = strtolower((string)$elementName);
$arr[$nextIdx]['attributes'] = array();
$attributes = $node->attributes();
foreach ($attributes as $attributeName => $attributeValue) {
$attribName = strtolower(trim((string)$attributeName));
$attribVal = trim((string)$attributeValue);
$arr[$nextIdx]['attributes'][$attribName] = $attribVal;
}
$text = (string)$node;
$text = trim($text);
if (strlen($text) > 0) {
$arr[$nextIdx]['text'] = $text;
}
$arr[$nextIdx]['children'] = array();
$this->xml2array($node, $arr[$nextIdx]['children']);
}
return true;
}
}
/**
* A class for handling REST responses
*
* @package modx
* @subpackage rest
*/
class modRestResponse {
/**
* @var string The type of response format
*/
public $responseType = 'xml';
/** @var SimpleXMLElement $xml */
public $xml = null;
/** @var string $json */
public $json = null;
/**
* The constructor for the modRestResponse class.
*
* @param modRestClient &$client A reference to the modRestClient instance.
* @param string $response The response from the REST server.
* @param string $responseType The type of response, either xml or json
* @return modRestResponse
*/
function __construct(modRestClient &$client, $response, $responseType = 'xml') {
$this->client =& $client;
$this->response = $response;
if ($responseType == 'xml') {
$this->toXml();
} else if ($responseType == 'json') {
$this->fromJSON();
}
}
/**
* Translates the current response object to a SimpleXMLElement instance
*
* @access public
* @return SimpleXMLElement
*/
public function toXml() {
if (!empty($this->xml) && $this->xml instanceof SimpleXMLElement) return $this->xml;
try {
$this->xml = simplexml_load_string($this->response);
} catch (Exception $e) {
$this->client->modx->log(xPDO::LOG_LEVEL_ERROR,'Could not parse XML response from provider: '.$this->response);
}
if (!$this->xml) {
$this->client->modx->log(xPDO::LOG_LEVEL_ERROR,'Could not connect to provider at: '.$this->client->host);
$this->xml = new SimpleXMLElement('<?xml version="1.0" encoding="UTF-8"?><error><message>'.$this->client->modx->lexicon('provider_err_blank_response').'</message></error>');
return $this->xml;
}
return $this->xml;
}
/**
* Translates current response from JSON to an array
*
* @access public
* @return array
*/
public function fromJSON() {
if (!empty($this->json)) return $this->json;
$this->json = $this->client->modx->fromJSON($this->response);
return $this->json;
}
/**
* Checks to see whether or not the response is an error response
*
* @access public
* @return boolean True if the response is an error
*/
public function isError() {
if ($this->responseType == 'xml') {
$this->toXml();
$isError = $this->xml->getName() == 'error';
} else {
$this->fromJSON();
$isError = !empty($this->json['error']) ? true : false;
}
return $isError;
}
/**
* Returns an error message, if any.
*
* @access public
* @return string The error message
*/
public function getError() {
$message = '';
if ($this->responseType == 'xml') {
if (empty($this->xml) || !($this->xml instanceof SimpleXMLElement)) {
$message = '';
} else {
$message = (string)$this->xml->message;
}
} else {
$this->fromJSON();
$message = !empty($this->json['error']) && !empty($this->json['message']) ? $this->json['message'] : '';
}
return $message;
}
}