//Server-side Javascript (Node.js)
//This implementation uses Node.js, which powers SVR.JS.
//This implementation contains elements specific for SVR.JS mods:
// req - A server request instance
// res - A server response instance
// serverconsole - A console output object for SVR.JS
// responseEnd - Response ending method of SVR.JS
// href - Request URL without query
// ext - File extension of requested file
// uobject - Request URL object
// search - Request URL queries
// defaultPage - An index page location (deprecated, always returns 'index.json')
// users - A list of users (deprecated)
// page404 - 404 Not Found page location
// head - A head of server response
// foot - A foot of server response
// fd - Currently unused
// elseCallback - Method summoning SVR.JS internal callbacks
// callServerError - Method to end with server error
// getCustomHeaders - Method to get headers defined in config.json file
// origHref - Original request URL without query (before URL rewriting)
// redirect - Method to redirect.
// parsePostData - Method to parse POST data.
//Along with elements added by this implementation:
// disableEndElseCallbackExecute - Determines execution of elseCallback on end
// filterHeaders - Removes invalid HTTP/1.0 headers
// customvar1, customvar2, customvar3, customvar4 - Custom variables
//Built-in libraries:
// http
// https
// readline
// os
// url
// hexstrbase64
// fs
// path
// crypto
// stream
//If you send response remember and don't use disableEndElseCallbackExecute, use "return;", or else SVR.JS will crash.
//If you use proxy, use filterHeaders to remove HTTP/2.0 headers, which are invalid in HTTP/1.0.
//If you type no code, elseCallback is executed.
//Below we have example script, which serves dynamic content.
disableEndElseCallbackExecute = true; //Avoid crashing on async.
var headers = getCustomHeaders(); //Headers
if(!fs.existsSync(__dirname + "/../temp/requestCounter")) {
fs.writeFileSync(__dirname + "/../temp/requestCounter","0"); //Reset counter
}
headers["Content-Type"] = 'text/html; charset=utf-8' //HTML output
if(href == "/hello.svr") {
fs.readFile(__dirname + "/../temp/requestCounter", (err,data) => {
if(err) throw err;
var requestCounter = parseInt(data.toString()); //Counter
fs.writeFile(__dirname + "/../temp/requestCounter",(requestCounter + 1).toString(),() => {
//Increase value of counter
});
res.writeHead(200, "OK", headers); //Write Head
res.end("SVR.JS ServerSide TestHello World!
This is a test from server-side JavaScript. This test is executed " + requestCounter.toString() + " times from taking server up." + (req.headers.origin == undefined ? "" : " This request is done from a proxy.") + "
SVR.JS/" + configJSON.version + ' (' + os.platform()[0].toUpperCase() + os.platform().slice(1) + ')' + (req.headers.host == undefined ? "" : " on " + req.headers.host) + "
"); //Write response
serverconsole.resmessage("Client successfully recieved content."); //Log into SVR.JS
return; //Prevent SVR.JS from crashing
});
} else if(href == "/proxy.svr") {
callServerError(403,"SVR.JS-exampleproxy"); //Server error
serverconsole.errmessage("Client fails to recieve content."); //Log into SVR.JS
} else if(href.indexOf("/proxy.svr/") == 0) {
var hn = href.split("/")[2]; //Hostname
if(hn != "this" && !(req.socket.realRemoteAddress ? req.socket.realRemoteAddress : req.socket.remoteAddress).match(/^(?:localhost$|::1$|f[c-d][0-9a-f]{2}:|(?:::ffff:)?(?:(?:127|10)\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}|192\.168\.[0-9]{1,3}\.[0-9]{1,3}|172\.(?:1[6-9]|2[0-9]|3[0-1])\.[0-9]{1,3}\.[0-9]{1,3})$)/i) ) {
//Prevent open proxy
callServerError(403,"SVR.JS-exampleproxy"); //Server error
serverconsole.errmessage("Client fails to recieve content."); //Log into SVR.JS
return;
}
var hdrs = req.headers;
hdrs["Host"] = (hn == "this" ? req.headers.host : hn);
hdrs["Origin"] = (req.headers.host == undefined ? "" : req.headers.host);
var options = {
hostname: (hn == "this" ? req.headers.host.split(":")[0] : hn.split(":")[0]),
port: (hn == "this" ? req.headers.host.split(":")[1] : (hn.split(":")[1] == undefined ? 80 : hn.split(":")[1])),
path: req.url.replace("/proxy.svr/" + hn,""),
method: req.method,
headers: filterHeaders(hdrs)
};
var proxy = http.request(options, function (sres) {
res.writeHead(sres.statusCode, sres.headers)
sres.pipe(res, {
end: true
});
});
proxy.on("error",(ex) => {
callServerError(500,"SVR.JS-exampleproxy",ex.stack); //Server error
serverconsole.errmessage("Client fails to recieve content."); //Log into SVR.JS
});
req.pipe(proxy, {
end: true
});
} else {
elseCallback(); //Load SVR.JS internal callbacks
}