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<?php |
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namespace Smindel\GIS\Control; |
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use SilverStripe\Core\Injector\Injector; |
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use SilverStripe\Control\Controller; |
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use SilverStripe\Core\Config\Config; |
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use Smindel\GIS\GIS; |
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use Smindel\GIS\Interfaces\HeaderAltererInterface; |
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class GeoJsonService extends AbstractGISWebServiceController |
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{ |
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private static $url_handlers = [ |
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'$Model' => 'handleAction', |
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]; |
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/** |
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* @var HeaderAltererInterface |
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*/ |
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private $headerAlterer; |
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public function __construct() |
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{ |
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parent::__construct(); |
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$this->headerAlterer = Injector::inst()->get('Smindel\GIS\Helper\HeaderAlterer'); |
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} |
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public function getConfig($model) |
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{ |
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$modelConfig = parent::getConfig($model); |
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if (!$modelConfig) { |
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return false; |
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} |
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$defaults = [ |
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'property_map' => singleton($model)->summaryFields(), |
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]; |
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return is_array($modelConfig) ? array_merge($defaults, $modelConfig) : $defaults; |
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} |
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public function index($request) |
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{ |
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$model = $this->getModel($request); |
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$config = $this->getConfig($model); |
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$list = $this->getRecords($request); |
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$propertyMap = $config['property_map']; |
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$this->headerAlterer->setHeader('Access-Control-Allow-Origin: ' . $config['access_control_allow_origin']); |
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// The HTTP kernel keeps a copy of the response body, which |
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// can exhaust the memory limit for large data sets. So we |
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// opt out and flush the buffer after processing each feature. |
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if (!($is_test = headers_sent())) { |
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$this->headerAlterer->setHeader('Content-Type: application/geo+json'); |
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} |
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echo '{"type":"FeatureCollection","features":['; |
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foreach ($list as $item) { |
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if (!$item->canView()) { |
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continue; |
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} |
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echo isset($geo) ? ',' : ''; |
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$geo = GIS::create($item->{$config['geometry_field']})->reproject(4326); |
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$properties = []; |
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foreach ($propertyMap as $fieldName => $propertyName) { |
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$properties[$propertyName] = $item->$fieldName; |
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} |
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$feature = [ |
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'type' => 'Feature', |
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'geometry' => ['type' => $geo->type], |
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'properties' => $properties, |
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]; |
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if ($geo->type == GIS::TYPES['geometrycollection']) { |
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$geometries = []; |
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foreach ($geo->geometries as $geometry) { |
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$geometries[] = [ |
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'type' => $geometry->type, |
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'coordinates' => $geometry->coordinates, |
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]; |
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} |
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$feature['geometry']['geometries'] = $geometries; |
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} else { |
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$feature['geometry']['coordinates'] = $geo->coordinates; |
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} |
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echo json_encode($feature); |
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} |
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echo ']}'; |
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if (!$is_test) { |
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die; |
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} |
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} |
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} |
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smindel /
silverstripe-gis
In general, usage of exit should be done with care and only when running in a scripting context like a CLI script.