/
SparqlExtension_body.php
executable file
·185 lines (163 loc) · 6.31 KB
/
SparqlExtension_body.php
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<?php
/**
* Class that controls the special page. Creates a form and pipes/proxies/transforms the results from the endpoint backlto the client.
* Useful if you want to transform the sparql results to a custom format. In this case specially used to implement the google visualisation
* datasource format.
* @author A.Chmieliauskas@tudeflt.nl
* @package SparqlExtension
*/
class SparqlExtension extends SpecialPage {
public static $XML_TYPE = "xml";
public static $JSON_TYPE = "json";
public static $CSV_TYPE = "csv";
public static $TSV_TYPE = "tsv";
public static $TEXT_TYPE = "text";
public static $GDS_TYPE = "gds";
public static $SR_TYPE = "semantic-reports";
public static $GDS_XSL_URL = "http://enipedia.tudelft.nl/scripts/sparqlxml2googlejson.sparqlextension.xsl";
function __construct() {
parent::__construct('SparqlExtension');
wfLoadExtensionMessages('SparqlExtension');
}
function execute($par) {
global $wgRequest, $wgOut, $sparqlEndpointConfiguration;
$request = $wgRequest->getValues();
if (is_null($wgRequest->getVal("query"))) {
// if no query provided - show the form page
$url = $this->getTitle()->getLinkUrl();
$formHTML =
"<form action=\"".$url."\" method=\"get\">" .
"<textarea name=\"query\" rows=\"40\">".
SparqlUtil::createPrefixes().
"select * where {\n".
"?x ?y ?z .\n".
"} limit 10".
"</textarea>".
"<div><select name=\"".$sparqlEndpointConfiguration["output_type_parameter"]."\">".
"<option value=\"".SparqlExtension::$XML_TYPE."\">XML</option>".
"<option value=\"".SparqlExtension::$JSON_TYPE."\">JSON</option>".
"<option value=\"".SparqlExtension::$TEXT_TYPE."\" selected=\"true\">TEXT</option>".
"<option value=\"".SparqlExtension::$CSV_TYPE."\">CSV</option>".
"<option value=\"".SparqlExtension::$TSV_TYPE."\">TSV</option>".
"<option value=\"".SparqlExtension::$GDS_TYPE."\">GOOGLE-VIS</option>".
"<option value=\"".SparqlExtension::$SR_TYPE."\">SEMANTIC REPORT</option>".
"</select><input type=\"submit\" value=\"Get Results\" /></form></div>";
$this->setHeaders();
$wgOut->addHTML( $formHTML );
} else {
$sparql_url = $sparqlEndpointConfiguration["service_url"];
$response = "";
$header = "";
$output = isset($request["output"]) ? $request["output"] : "xml";
switch (strtolower($output)){
case "xml":
$url = SparqlUtil::build_restful_url($sparql_url, $request);
$opts = array('http' =>
array(
'method' => 'GET',
'header' => 'Accept: application/sparql-results+xml, application/rdf+xml, application/xml',
)
);
$context = stream_context_create($opts);
$response = file_get_contents($url, false, $context);
$header = "Content-type: application/xml; charset=utf-8";
break;
case "gds":
$url = SparqlUtil::build_restful_url($sparql_url, $request);
$inputparams =array();
if (isset($request["tqx"]))
$inputparams["tqx"] = $request["tqx"];
$response = $this->xslt_transform($url, SparqlExtension::$GDS_XSL_URL, $inputparams);
$header = "Content-type: application/x-javascript; charset=utf-8";
break;
case "json":
$url = SparqlUtil::build_restful_url($sparql_url, $request);
$opts = array('http' =>
array(
'method' => 'GET',
'header' => 'Accept: application/sparql-results+json, application/rdf+json, application/json',
)
);
$context = stream_context_create($opts);
$response = file_get_contents($url, false, $context);
$header = "Content-type: application/json; charset=utf-8";
break;
case "text":
$url = SparqlUtil::build_restful_url($sparql_url, $request);
$opts = array('http' =>
array(
'method' => 'GET',
'header' => 'Accept: text/plain, text/*, */*',
)
);
$context = stream_context_create($opts);
$response = file_get_contents($url, false, $context);
$header = "Content-type: text/plain; charset=utf-8";
break;
case "csv":
$url = SparqlUtil::build_restful_url($sparql_url, $request);
$opts = array('http' =>
array(
'method' => 'GET',
'header' => 'Accept: text/csv, text/*, */*',
)
);
$context = stream_context_create($opts);
$response = file_get_contents($url, false, $context);
$header = "Content-type: text/csv; charset=utf-8";
break;
case "tsv":
$url = SparqlUtil::build_restful_url($sparql_url, $request);
$opts = array('http' =>
array(
'method' => 'GET',
'header' => 'Accept: text/tsv, text/*, */*',
)
);
$context = stream_context_create($opts);
$response = file_get_contents($url, false, $context);
$header = "Content-type: text/tsv; charset=utf-8";
break;
case "semantic-reports":
$request["endpoint"] = $sparql_url;
$request["view"] = "create";
$url = SparqlUtil::build_restful_url("http://semanticreports.com/reports/", $request);
//$response = file_get_contents($url);
$header = "Location: " . $url;
break;
default:
$url = SparqlUtil::build_restful_url($sparql_url, $request);
$opts = array('http' =>
array(
'method' => 'GET',
'header' => 'Accept: application/sparql-results+xml, application/rdf+xml, application/xml',
)
);
$context = stream_context_create($opts);
$response = file_get_contents($url, false, $context);
$header = "Content-type: application/xml; charset=utf-8";
break;
}
$wgOut->disable();
header($header);
print $response;
}
}
function xslt_transform($url_xml, $url_xsl, $params=false){
# LOAD XML FILE
$XML = new DOMDocument();
$XML->load( $url_xml );
# LOAD XSL FILE
$XSL = new DOMDocument();
$XSL->load( $url_xsl , LIBXML_NOCDATA);
# START XSLT
$xslt = new XSLTProcessor();
#load style sheet
$xslt->importStylesheet( $XSL );
#set params
$xslt->setParameter("",$params);
#transform
$data = $xslt->transformToXML( $XML );
return $data;
}
}