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<?php
declare( strict_types = 1 );
namespace Maps\DataAccess;
use FileFetcher\FileFetcher;
use FileFetcher\FileFetchingException;
use Maps\MapsFactory;
use ValueParsers\ParseException;
use ValueParsers\ValueParser;
/**
* Returns the content of the JSON file at the specified location as array.
* Empty array is returned on failure.
*
* @licence GNU GPL v2+
* @author Jeroen De Dauw < jeroendedauw@gmail.com >
*/
class JsonFileParser implements ValueParser {
private $fileFetcher;
private $pageContentFetcher;
private $defaultNamespace;
public function __construct( $fileFetcher = null, PageContentFetcher $pageContentFetcher = null ) {
$this->fileFetcher = $fileFetcher instanceof FileFetcher
? $fileFetcher : MapsFactory::newDefault()->getGeoJsonFileFetcher();
$this->pageContentFetcher = $pageContentFetcher instanceof PageContentFetcher
? $pageContentFetcher : MapsFactory::newDefault()->getPageContentFetcher();
$this->defaultNamespace = NS_GEO_JSON;
}
/**
* @param string $fileLocation
*
* @return array
* @throws ParseException
*/
public function parse( $fileLocation ) {
$jsonString = $this->getJsonString( $fileLocation );
if ( $jsonString === null ) {
return [];
}
$json = json_decode( $jsonString, true );
if ( $json === null ) {
return [];
}
return $json;
}
private function getJsonString( string $fileLocation ): ?string {
$content = $this->pageContentFetcher->getPageContent( $fileLocation, $this->defaultNamespace );
if ( $content instanceof \JsonContent ) {
return $content->getNativeData();
}
// Prevent reading JSON files on the server
if( !filter_var( $fileLocation, FILTER_VALIDATE_URL) ) {
return null;
}
try {
return $this->fileFetcher->fetchFile( $fileLocation );
}
catch ( FileFetchingException $ex ) {
return null;
}
}
}
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