var error = require("http-error");

var fs = require("fs");

exports.errorHandler = function() {

return function(err, req, res, next) {

if (err && (typeof err.code !== "undefined" && typeof err.defaultMessage !== "undefined")) {

// if it walks like a duck, etc.

// don't do anything

}

else if (!(err instanceof Error)) {

err = new error.InternalServerError(err.message || err.toString());

}

else if (!(err instanceof error.HttpError)) {

err.code = 500;

err.defaultMessage = "Internal Server Error";

}

var isXHR = req.url.indexOf("xhr=1") > -1 ||

(req.headers["x-requested-with"] && req.headers["x-requested-with"].toLowerCase() == "xmlhttprequest");

if (!isXHR) {

fs.readFile(__dirname + "/view/error.tmpl.html", "utf8", function(e, html) {

if (e)

return next(e);

html = html

.toString('utf8')

.replace(/\<%errormsg%\>/g, err.toString());

res.writeHead(err.code || 500, {"Content-Type": "text/html"});

return res.end(html);

});

}

else {

res.writeHead(err.code || 500, {"Content-Type": "text/plain"});

res.end(err.message ? err.message.toString() : "");

}

if (err.stack)

console.log("Exception found" + err.message + "\n" + err.stack);

};

};