function wl_ajax_sparql()
{
header('Access-Control-Allow-Origin: *');
// Get the query slug.
$slug = $_GET['slug'];
// Get the output format: csv or geojson.
$format = empty($_GET['format']) ? 'csv' : $_GET['format'];
// TODO: define an output format.
$output = 'csv';
$accept = 'text/csv';
// Get the query.
$query = wl_sparql_replace_params(wl_sparql_get_query_by_slug($slug), $_GET);
$dataset = wl_sparql_get_query_dataset_by_slug($slug);
// Print out the query if the debug flag is set.
if (isset($_GET['_debug']) && 1 == $_GET['_debug']) {
wp_die($query);
}
if (empty($query)) {
wp_die("Cannot find a SPARQL query [ slug :: {$slug} ]");
}
$url = wl_configuration_get_query_select_url($output, $dataset) . urlencode($query);
// Prepare the request.
$args = array('method' => 'GET', 'headers' => array('Accept' => $accept));
// Send the request. Raise actions before and after the request is being sent.
do_action('wl_sparql_pre_request', $url, $args, $query);
// Send the request via caching if the module is available.
$response = function_exists('wl_caching_remote_request') ? wl_caching_remote_request($url, $args) : wp_remote_post($url, $args);
do_action('wl_sparql_post_request', $url, $args, $query, $response);
// If an error has been raised, return the error.
if (is_wp_error($response) || 200 !== (int) $response['response']['code']) {
echo "wl_execute_sparql_query ================================\n";
if (is_wp_error($response)) {
var_dump($response);
} else {
echo " request : \n";
var_dump($args);
echo " response: \n";
var_dump($response);
echo " response body: \n";
echo $response['body'];
}
echo "=======================================================\n";
return false;
}
// Output the data according to the chosen format.
switch ($format) {
case 'geojson':
wl_csv_to_geojson($response['body']);
break;
case 'json':
wl_csv_to_json($response['body']);
break;
default:
echo $response['body'];
}
wp_die();
}
function test_caching_expired()
{
$url = 'http://example.org/';
$args = array('method' => 'GET');
// ensure a previous cache file doesn't exists.
$hash_0 = wl_caching_hash($url, $args);
wl_caching_delete($hash_0);
// Cache for 5 seconds.
$response_0 = wl_caching_remote_request($url, $args, false, 5);
#$this->assertFalse( wl_caching_response_is_cached( $response_0 ) );
// Check that the first request is still cached.
$response_1 = wl_caching_remote_request($url, $args);
$this->assertTrue(wl_caching_response_is_cached($response_1));
// Wait 5 seconds and check that another request is not cached.
sleep(5);
$response_2 = wl_caching_remote_request($url, $args);
$this->assertFalse(wl_caching_response_is_cached($response_2));
}
/**
* Load a remote graph. A suffix is added automatically to the URL using the $wl_entity_view_suffix.
*
* @since 3.0.0
*
* @param string $url The URL.
* @return null|object A graph instance or null if the JSON is invalid.
*/
function wl_jsonld_load_remote($url)
{
global $wl_entity_view_suffix;
// TODO: validate the URI.
// Build the full URI.
$url_with_suffix = $url . $wl_entity_view_suffix;
wl_write_log("Loading URL [ url :: {$url_with_suffix} ]");
// Use the caching method if it's loaded.
if (function_exists('wl_caching_remote_request')) {
$response = wl_caching_remote_request($url_with_suffix, array('method' => 'GET'));
} else {
$response = wp_remote_get($url_with_suffix);
}
// TODO: handle errors.
if (is_wp_error($response)) {
wl_write_log("An error occurred loading URL [ url :: {$url_with_suffix} ]");
wp_die(var_export($response, true));
}
// Decode the JSON and return it.
$json = json_decode($response['body'], true);
// The json is invalid.
if (null === $json) {
wl_write_log("Cannot decode the JSON [ url :: {$url_with_suffix} ]");
return null;
}
// The JSON doesn't have a graph.
if (!isset($json[0]['@graph'][0])) {
wl_write_log("Cannot locate the graph [ url :: {$url_with_suffix} ]");
return null;
}
return $json[0]['@graph'][0];
}
