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ProgBlog/app/config/error-handlers.js

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'use strict';
// -----------------------------------------------------------------------------
// Error handlers
// -----------------------------------------------------------------------------
const container = require('../Container');
const app = container.get('app');
const HTTP_CODE_MAP = require('http').STATUS_CODES;
const errors = require('errors');
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const negotiate = require('express-negotiate');
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let errorHandlers = new Set([
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function handle400Errors(err, req, res, next) {
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if (! req.route) {
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// if no route matches, send a 404
err = new errors.Http404Error();
} else if (err instanceof negotiate.NotAcceptable) {
// if no content type matches, send a 406
err = new errors.Http406Error();
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}
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return next(err);
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},
// general error handler
function handleError(err, req, res, next) {
let httpStatus = err.status || 500;
let message = err.message || HTTP_CODE_MAP[httpStatus];
res.status(httpStatus);
let output = {
status: httpStatus,
message: message,
};
// Show stack trace in development environment
if (app.get('env') === 'development') {
output.error = err;
}
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// Send html or json depending on client accept header
req.negotiate({
html: () => {
res.render('error', {
title: `${err.status} ${err.message}`,
error: output,
});
},
'application/json': () => {
res.json(output);
},
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});
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},
]);
module.exports = errorHandlers;