Swagger Cache

swagger-cache.php

<?php

// Access-Control headers are received during OPTIONS requests
if ($_SERVER['REQUEST_METHOD'] == 'OPTIONS') {

if (isset($_SERVER['HTTP_ACCESS_CONTROL_REQUEST_METHOD']))
    header("Access-Control-Allow-Methods: GET, POST, OPTIONS");         

if (isset($_SERVER['HTTP_ACCESS_CONTROL_REQUEST_HEADERS']))
    header("Access-Control-Allow-Headers: {$_SERVER['HTTP_ACCESS_CONTROL_REQUEST_HEADERS']}");

    exit(0);
}

header('Content-Type: text/plain; charset=utf-8');

// Allow from any origin
if (isset($_SERVER['HTTP_ORIGIN'])) {
    // Decide if the origin in $_SERVER['HTTP_ORIGIN'] is one
    // you want to allow, and if so:
    header("Access-Control-Allow-Origin: {$_SERVER['HTTP_ORIGIN']}");
    header('Access-Control-Allow-Credentials: true');
    header('Access-Control-Max-Age: 86400');    // cache for 1 day
}

$cacheFile = "swagger.cache";

if (file_exists($cacheFile)) {
	if(filemtime($cacheFile) + 600 > time()){
		//cache hit
		$data =  file_get_contents($cacheFile);
		echo $data;
	} else {
		//cache miss
		$data = getUpdatedSwaggerDoc();
		$file = fopen($cacheFile,"w");
		echo fwrite($file,$data);
		fclose($file);
		echo $data;
	}
} else {
	$data = getUpdatedSwaggerDoc();
	$file = fopen($cacheFile,"w");
	echo fwrite($file,$data);
	fclose($file);
	echo $data;
}









function getUpdatedSwaggerDoc(){

	// create curl resource
	$ch = curl_init();

	// set url
	curl_setopt($ch, CURLOPT_URL, "https://api.github.com/repos/flipkart/connekt/contents/schema/swagger-api.yaml");

	curl_setopt($ch, CURLOPT_HTTPHEADER, array('Authorization: token <token>', 'Accept: application/vnd.github.v3.raw', 'User-Agent: php-cli'));

	//return the transfer as a string
	curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);

	// $output contains the output string
	$output = curl_exec($ch);

	// close curl resource to free up system resources
	curl_close($ch);

	return $output;
}