266 lines
7.5 KiB
PHP
266 lines
7.5 KiB
PHP
<?php
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/**
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* @package sapphire
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* @subpackage integration
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*/
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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.com/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 $rawXML;
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protected $errorTag;
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protected $checkErrors;
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protected $cache_expire;
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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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}
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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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protected function constructURL(){
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return "$this->baseURL?$this->queryString";
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}
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/**
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* Connects to the RESTful service and gets its response.
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* @todo implement authentication via cURL for
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*/
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function connect(){
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$url = $this->constructURL(); //url for the request
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//check for file exists in cache
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//set the cache directory
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$cachedir=TEMP_FOLDER; //default silverstrip-cache
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$cache_file = md5($url); //encoded name of cache file
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$cache_path = $cachedir."/$cache_file";
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if(( @file_exists("$cache_path") && ((@filemtime($cache_path) + $this->cache_expire) > ( time() )))){
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$this->rawXML = file_get_contents($cache_path);
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}
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else {//not available in cache fetch from server
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$ch = curl_init();
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$timeout = 5;
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$useragent = "SilverStripe/2.2";
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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, $timeout);
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$this->rawXML = curl_exec($ch);
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curl_close($ch);
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}
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//Try using file_get_contents if cURL is not installed in your system.
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//$this->rawXML = file_get_contents($url);
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//results returned - from cache / live
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if($this->rawXML != ""){
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//save the response in cache
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$fp = @fopen($cache_path,"w+");
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@fwrite($fp,$this->rawXML);
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@fclose($fp);
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if($this->checkErrors == true) {
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return $this->errorCatch($this->rawXML);
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}
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else {
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return $this->rawXML;
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}
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}
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else {
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user_error("Invalid Response (maybe your calling to wrong URL or server unavailable)", E_USER_ERROR);
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}
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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 $element The element we need to extract the attributes.
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*/
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function getAttributes($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 $attr The name of the attribute
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*/
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function getAttribute($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 $element The element we need to extract the node values.
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*/
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function getValues($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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?>
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