Add the PHP converter.

Nathanael Jourdane
1 parent 802f8727
Showing 1 changed file with 70 additions and 0 deletions Show diff stats
get_cdf.php
@@ -0,0 +1,70 @@
+<?php
+
+/**
+* Look for a NetCDF file in the local base dir, then convert it using the NetCDF to CDF Python converter.
+*/
+
+$converterPath = './nc2cdf.py';
+$tmpDir = '/tmp/';
+$log_path = $tmpDir . 'get_cdf.log';
+
+if (!$_GET['id']) {
+	exit('INPUT ERROR');
+}
+
+require_once './DDserverWeb_ini.php';
+
+$name = preg_replace('/\..*/', '', $_GET['id']); // ie. ACE/SW/sw19980204
+$inputFilePath = baseDir . $name . '.nc.gz'; // ie. /data/DDBASE/DATA/ACE/SW/sw19980204.nc.gz
+$outputFilePath = $tmpDir . str_replace('/', '_', $name) . '.cdf'; // ie. /tmp/ACE_SW_sw19980204.cdf
+
+function send_file($mime_type, $send_file_path) {
+	header('Content-Description: File Transfer');
+	header('Content-Type: ' . $mime_type);
+	header('Content-Disposition: attachment; filename="' . basename($send_file_path) . '"');
+	header('Expires: 0');
+	header('Cache-Control: must-revalidate');
+	header('Pragma: public');
+	header('Content-Length: ' . filesize($send_file_path));
+	readfile($send_file_path);
+}
+
+function error($log_msg) {
+	global $inputFilePath, $log_path;
+	file_put_contents($log_path, date("Y-m-d H:i:s") . " with id='" . $_GET['id'] . "': $log_msg\n", FILE_APPEND);
+	// If the file can not be converted, return the NetCDF file.
+	send_file('application/x-gzip', basename($inputFilePath));
+	exit;
+}
+
+if (!file_exists($inputFilePath)) {
+	exit('NO SUCH FILE');
+}
+
+if (!is_dir(pathinfo($outputFilePath, PATHINFO_DIRNAME))) {
+	error("Can not create $outputFilePath because the folder does not exist.");
+}
+
+try {
+	$res = shell_exec("$converterPath $inputFilePath $outputFilePath");
+} catch (Exception $e) {
+	error("Error on shell_exec():\n$e");
+}
+
+
+// The converter is not supposed to output something if the file has been successfully converted
+if(trim($res) != '') {
+	error("The converter said:\n$res");
+}
+
+if(! file_exists($outputFilePath)) {
+	error("The output file $outputFilePath has not been created.");
+}
+
+send_file('application/x-cdf', $outputFilePath);
+
+sleep(600); // Wait 10 minutes before to delete the converted file.
+unlink($outputFilePath);
+
+exit;
+?>