356 lines
10 KiB
PHP
356 lines
10 KiB
PHP
<?php
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/**
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* RestfulService class allows you to consume various RESTful APIs.
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* Through this you could connect and aggregate data of various web services.
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* For more info visit wiki documentation - http://doc.silverstripe.org/doku.php?id=restfulservice
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* @package sapphire
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* @subpackage integration
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*/
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class RestfulService extends ViewableData {
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protected $baseURL;
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protected $queryString;
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protected $errorTag;
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protected $checkErrors;
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protected $cache_expire;
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protected $authUsername, $authPassword;
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protected $customHeaders = array();
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/**
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* Creates a new restful service.
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* @param string $base Base URL of the web service eg: api.example.com
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* @param int $expiry Set the cache expiry interva. Defaults to 1 hour (3600 seconds)
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*/
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function __construct($base, $expiry=3600){
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$this->baseURL = $base;
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$this->cache_expire = $expiry;
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parent::__construct();
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}
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/**
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* Sets the Query string parameters to send a request.
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* @param array $params An array passed with necessary parameters.
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*/
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function setQueryString($params=NULL){
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$this->queryString = http_build_query($params,'','&');
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}
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/**
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* Set basic authentication
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*/
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function basicAuth($username, $password) {
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$this->authUsername = $username;
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$this->authPassword = $password;
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}
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/**
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* Set a custom HTTP header
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*/
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function httpHeader($header) {
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$this->customHeaders[] = $header;
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}
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protected function constructURL(){
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return "$this->baseURL" . ($this->queryString ? "?$this->queryString" : "");
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}
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/**
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* @deprecated Use RestfulService::request()
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*/
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public function connect($subURL = '') {
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user_error("RestfulService::connect is deprecated; use RestfulService::request", E_USER_NOTICE);
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return $this->request($subURL)->getBody();
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}
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/**
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* Makes a request to the RESTful server, and return a {@link RestfulService_Response} object for parsing of the result.
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* @todo Better POST, PUT, DELETE, and HEAD support
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* @todo Caching of requests - probably only GET and HEAD requestst
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* @todo JSON support in RestfulService_Response
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* @todo Pass the response headers to RestfulService_Response
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*
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* This is a replacement of {@link connect()}.
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*/
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public function request($subURL = '', $method = "GET", $data = null, $headers = null) {
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$url = $this->baseURL . $subURL; // Url for the request
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if($this->queryString) {
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if(strpos($url, '?') !== false) {
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$url .= '&' . $this->queryString;
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} else {
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$url .= '?' . $this->queryString;
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}
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}
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$url = str_replace(' ', '%20', $url); // Encode spaces
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$method = strtoupper($method);
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assert(in_array($method, array('GET','POST','PUT','DELETE','HEAD','OPTIONS')));
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$cachedir = TEMP_FOLDER; // Default silverstripe cache
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$cache_file = md5($url); // Encoded name of cache file
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$cache_path = $cachedir."/xmlresponse_$cache_file";
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// Check for unexpired cached feed (unless flush is set)
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if(!isset($_GET['flush']) && @file_exists($cache_path) && @filemtime($cache_path) + $this->cache_expire > time()) {
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$store = file_get_contents($cache_path);
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$response = unserialize($store);
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} else {
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$ch = curl_init();
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$timeout = 5;
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$useragent = "SilverStripe/" . SapphireInfo::Version();
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curl_setopt($ch, CURLOPT_URL, $url);
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curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
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curl_setopt($ch, CURLOPT_USERAGENT, $useragent);
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curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $timeout);
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curl_setopt($ch, CURLOPT_FOLLOWLOCATION,1);
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curl_setopt($ch, CURLOPT_CUSTOMREQUEST, $method);
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// Add headers
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if($this->customHeaders) {
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$headers = array_merge((array)$this->customHeaders, (array)$headers);
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}
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if($headers) curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
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// Add authentication
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if($this->authUsername) curl_setopt($ch, CURLOPT_USERPWD, "$this->authUsername:$this->authPassword");
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// Add fields to POST requests
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if($method == 'POST') {
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curl_setopt($ch, CURLOPT_POST, 1);
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curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
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}
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// Run request
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curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
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$responseBody = curl_exec($ch);
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$curlError = curl_error($ch);
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// Problem verifying the server SSL certificate; just ignore it as it's not mandatory
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if(strpos($curlError,'14090086') !== false) {
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curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
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$responseBody = curl_exec($ch);
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$curlError = curl_error($ch);
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}
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if($responseBody === false) {
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user_error("Curl Error:" . $curlError, E_USER_WARNING);
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return;
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}
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$statusCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
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$response = new RestfulService_Response($responseBody, curl_getinfo($ch, CURLINFO_HTTP_CODE));
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curl_close($ch);
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// Serialise response object and write to cache
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$store = serialize($response);
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file_put_contents($cache_path,$store);
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}
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return $response;
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}
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/**
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* Gets attributes as an array, of a particular type of element.
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* Example : <photo id="2636" owner="123" secret="ab128" server="2">
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* returns id, owner,secret and sever attribute values of all such photo elements.
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* @param string $xml The source xml to parse, this could be the original response received.
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* @param string $collection The name of parent node which wraps the elements, if available
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* @param string $element The element we need to extract the attributes.
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*/
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public function getAttributes($xml, $collection=NULL, $element=NULL){
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$xml = new SimpleXMLElement($xml);
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$output = new DataObjectSet();
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if($collection)
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$childElements = $xml->{$collection};
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if($element)
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$childElements = $xml->{$collection}->{$element};
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if($childElements){
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foreach($childElements as $child){
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$data = array();
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foreach($child->attributes() as $key => $value){
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$data["$key"] = Convert::raw2xml($value);
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}
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$output->push(new ArrayData($data));
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}
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}
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return $output;
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}
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/**
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* Gets an attribute of a particular element.
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* @param string $xml The source xml to parse, this could be the original response received.
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* @param string $collection The name of the parent node which wraps the element, if available
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* @param string $element The element we need to extract the attribute
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* @param string $attr The name of the attribute
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*/
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public function getAttribute($xml, $collection=NULL, $element=NULL, $attr){
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$xml = new SimpleXMLElement($xml);
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$attr_value = "";
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if($collection)
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$childElements = $xml->{$collection};
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if($element)
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$childElements = $xml->{$collection}->{$element};
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if($childElements)
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$attr_value = (string) $childElements[$attr];
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return Convert::raw2xml($attr_value);
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}
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/**
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* Gets set of node values as an array.
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* When you get to the depth in the hierachchy use node_child_subchild syntax to get the value.
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* @param string $xml The the source xml to parse, this could be the original response received.
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* @param string $collection The name of parent node which wraps the elements, if available
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* @param string $element The element we need to extract the node values.
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*/
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public function getValues($xml, $collection=NULL, $element=NULL){
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$xml = new SimpleXMLElement($xml);
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$output = new DataObjectSet();
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$childElements = $xml;
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if($collection)
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$childElements = $xml->{$collection};
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if($element)
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$childElements = $xml->{$collection}->{$element};
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if($childElements){
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foreach($childElements as $child){
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$data = array();
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$this->getRecurseValues($child,$data);
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$output->push(new ArrayData($data));
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}
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}
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return $output;
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}
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protected function getRecurseValues($xml,&$data,$parent=""){
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$conv_value = "";
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$child_count = 0;
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foreach($xml as $key=>$value)
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{
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$child_count++;
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$k = ($parent == "") ? (string)$key : $parent . "_" . (string)$key;
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if($this->getRecurseValues($value,$data,$k) == 0){ // no childern, aka "leaf node"
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$conv_value = Convert::raw2xml($value);
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}
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//Review the fix for similar node names overriding it's predecessor
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if(array_key_exists($k, $data) == true) {
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$data[$k] = $data[$k] . ",". $conv_value;
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}
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else {
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$data[$k] = $conv_value;
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}
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}
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return $child_count;
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}
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/**
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* Gets a single node value.
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* @param string $xml The source xml to parse, this could be the original response received.
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* @param string $collection The name of parent node which wraps the elements, if available
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* @param string $element The element we need to extract the node value.
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*/
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function getValue($xml, $collection=NULL, $element=NULL){
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$xml = new SimpleXMLElement($xml);
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if($collection)
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$childElements = $xml->{$collection};
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if($element)
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$childElements = $xml->{$collection}->{$element};
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if($childElements)
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return Convert::raw2xml($childElements);
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}
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/**
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* Searches for a node in document tree and returns it value.
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* @param string $xml source xml to parse, this could be the original response received.
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* @param string $node Node to search for
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*/
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function searchValue($xml, $node=NULL){
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$xml = new SimpleXMLElement($xml);
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$childElements = $xml->xpath($node);
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if($childElements)
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return Convert::raw2xml($childElements[0]);
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}
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/**
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* Searches for a node in document tree and returns its attributes.
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* @param string $xml the source xml to parse, this could be the original response received.
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* @param string $node Node to search for
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*/
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function searchAttributes($xml, $node=NULL){
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$xml = new SimpleXMLElement($xml);
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$output = new DataObjectSet();
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$childElements = $xml->xpath($node);
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if($childElements)
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foreach($childElements as $child){
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$data = array();
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foreach($child->attributes() as $key => $value){
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$data["$key"] = Convert::raw2xml($value);
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}
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$output->push(new ArrayData($data));
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}
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return $output;
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}
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}
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class RestfulService_Response extends SS_HTTPResponse {
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protected $simpleXML;
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function __construct($body, $statusCode = 200, $headers = null) {
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$this->setbody($body);
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$this->setStatusCode($statusCode);
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$this->headers = $headers;
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}
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function simpleXML() {
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if(!$this->simpleXML) {
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try {
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$this->simpleXML = new SimpleXMLElement($this->body);
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}
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catch(Exception $e) {
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user_error("String could not be parsed as XML. " . $e, E_USER_WARNING);
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}
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}
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return $this->simpleXML;
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}
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/**
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* Return an array of xpath matches
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*/
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function xpath($xpath) {
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return $this->simpleXML()->xpath($xpath);
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}
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/**
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* Return the first xpath match
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*/
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function xpath_one($xpath) {
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$items = $this->xpath($xpath);
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return $items[0];
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}
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}
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?>
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