79 lines
2.1 KiB
JavaScript
79 lines
2.1 KiB
JavaScript
// Copyright IBM Corp. 2016,2018. All Rights Reserved.
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// Node module: strong-error-handler
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// This file is licensed under the MIT License.
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// License text available at https://opensource.org/licenses/MIT
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'use strict';
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var path = require('path');
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var SG = require('strong-globalize');
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SG.SetRootDir(path.resolve(__dirname, '..'));
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var buildResponseData = require('./data-builder');
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var debug = require('debug')('strong-error-handler');
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var format = require('util').format;
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var logToConsole = require('./logger');
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var negotiateContentProducer = require('./content-negotiation');
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function noop() {
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}
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/**
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* Create a middleware error handler function.
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*
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* @param {Object} options
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* @returns {Function}
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*/
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function createStrongErrorHandler(options) {
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options = options || {};
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debug('Initializing with options %j', options);
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// Log all errors via console.error (enabled by default)
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var logError = options.log !== false ? logToConsole : noop;
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return function strongErrorHandler(err, req, res, next) {
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logError(req, err);
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writeErrorToResponse(err, req, res, options);
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};
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};
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/**
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* Writes thrown error to response
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*
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* @param {Error} err
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* @param {Express.Request} req
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* @param {Express.Response} res
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* @param {Object} options
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*/
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function writeErrorToResponse(err, req, res, options) {
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debug('Handling %s', err.stack || err);
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options = options || {};
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if (res._header) {
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debug('Response was already sent, closing the underlying connection');
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return req.socket.destroy();
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}
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// this will alter the err object, to handle when res.statusCode is an error
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if (!err.status && !err.statusCode && res.statusCode >= 400)
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err.statusCode = res.statusCode;
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var data = buildResponseData(err, options);
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debug('Response status %s data %j', data.statusCode, data);
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res.setHeader('X-Content-Type-Options', 'nosniff');
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res.statusCode = data.statusCode;
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var sendResponse = negotiateContentProducer(req, warn, options);
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sendResponse(res, data);
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function warn(msg) {
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res.header('X-Warning', msg);
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debug(msg);
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}
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};
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exports = module.exports = createStrongErrorHandler;
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exports.writeErrorToResponse = writeErrorToResponse;
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