SATS/lib/api/source/sync.php

<?php

	require_once __DIR__.'/../../include/const';

	function api_request(){

		/* [1] Fetch & generate useful data
		=========================================================*/
		/* (1) Fetch target url */
		$url = @file_get_contents(URL_CONF);

		if( $url === false ){
			slog("Cannot find server's api url", 'api:sync');
			return 127;
		}

		/* (2) Fetch cyclic hash */
		$hash = syscall(SOURCE_DIR.'/lib/cyclic-hash/hash');

		if( strlen($hash) != 128 ){
			slog("Wrong cyclic-hash:hash hash length (".strlen($hash).")", 'api:sync');
			return 127;
		}

		/* (3) Try new hash if available */
		$new = syscall(SOURCE_DIR.'/lib/cyclic-hash/new');
		
		if( $new === false ){
			slog("cyclic-hash:new returned $new EXIT_STATUS", 'api:sync');
			return 127;
		}

		/* (4) Generate the multipart boundary */
		$boundary = 'boundary--'.hash('sha512', uniqid()).'--boundary';

		/* (5) Fetch data */
		$data = json_decode(syscall(SOURCE_DIR.'/lib/api/fetch'));

		if( is_null($data) ){
			slog("api:fetch returned unreadable content", 'api:sync');
			$data = [];
		}
		

		

		/* [2] Create httpRequest basis
		=========================================================*/
		/* (1) Set URL */
		$curl = curl_init();
		curl_setopt($curl, CURLOPT_URL, $url);

		/* (2) Set HTTP method -> POST */
		curl_setopt($curl, CURLOPT_POST, true);



		/* [3] Manage post data
		=========================================================*/
		/* (1) Set post data */
		$postarray = [
			'token' => $hash,
			'data'  => json_encode($data)
		];

		/* (2) Add renew if renew */
		if( strlen($new) == 128 )
			$postarray['renew'] = $new;

		/* (3) Parse postfiels to multipart format */
		$postraw = "--$boundary";

		foreach($postarray as $postkey=>$postvalue)
			$postraw .= "\r\nContent-Disposition: form-data; name=\"$postkey\"\r\n\r\n$postvalue\r\n--$boundary";

		$postraw .= "--";
		

		/* (4) Set postdata raw to curl */
		curl_setopt($curl, CURLOPT_POSTFIELDS, $postraw);



		/* [4] Manage headers
		=========================================================*/
		curl_setopt($curl, CURLOPT_HTTPHEADER, [
			"Content-Type: multipart/form-data; boundary=$boundary"
		]);


		/* [5] Send and catch request response
		=========================================================*/
		/* (1) Send and catch response */
		curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
		$response = curl_exec($curl);

		/* (2) Close request */
		curl_close($curl);
		
		/* (3) Return response as result */
		if( $response === false ){
			slog("Request error", 'api:sync');
			return 127;
		}


		/* [6] Decrement cyclic-hash so request has ran successfully
		=========================================================*/
		/* (1) Decrement the hash */
		$decr = syscall(SOURCE_DIR.'/lib/cyclic-hash/decr');

		if( $decr === false ){
			slog("cyclic-hash:decr returned $decr EXIT_STATUS", 'api:sync');
			return 127;
		}



		

		
		/* [6] Response management
		=========================================================*/
		/* (1) Writes request to temporary pipe */
		file_put_contents(TMP_DIR.'/api.response', $response);

		/* (2) Manage response deployement */
		$deploy = syscall(SOURCE_DIR.'/lib/api/deploy');
		
		/* (3) Return state */
		return ($deploy === true);
		
	}

	echo api_request();
	
	

?>