Error

From 55a4f1fc869e41aca748c63d3018f0448b1606e0 Mon Sep 17 00:00:00 2001 From: pack Date: Sun, 9 Aug 2026 10:37:07 +0000 Subject: first commit --- node_modules/finalhandler/index.js | 293 +++++++++++++++++++++++++++++++++++++ 1 file changed, 293 insertions(+) create mode 100644 node_modules/finalhandler/index.js (limited to 'node_modules/finalhandler/index.js') diff --git a/node_modules/finalhandler/index.js b/node_modules/finalhandler/index.js new file mode 100644 index 0000000..bf15e48 --- /dev/null +++ b/node_modules/finalhandler/index.js @@ -0,0 +1,293 @@ +/*! + * finalhandler + * Copyright(c) 2014-2022 Douglas Christopher Wilson + * MIT Licensed + */ + +'use strict' + +/** + * Module dependencies. + * @private + */ + +var debug = require('debug')('finalhandler') +var encodeUrl = require('encodeurl') +var escapeHtml = require('escape-html') +var onFinished = require('on-finished') +var parseUrl = require('parseurl') +var statuses = require('statuses') + +/** + * Module variables. + * @private + */ + +var isFinished = onFinished.isFinished + +/** + * Create a minimal HTML document. + * + * @param {string} message + * @private + */ + +function createHtmlDocument (message) { + var body = escapeHtml(message) + .replaceAll('\n', '
') + .replaceAll(' ', ' ') + + return '\n' + + '\n' + + '\n' + + '\n' + + 'Error\n' + + '\n' + + '\n' + + '

' + body + '

\n' + + '\n' + + '\n' +} + +/** + * Module exports. + * @public + */ + +module.exports = finalhandler + +/** + * Create a function to handle the final response. + * + * @param {Request} req + * @param {Response} res + * @param {Object} [options] + * @return {Function} + * @public + */ + +function finalhandler (req, res, options) { + var opts = options || {} + + // get environment + var env = opts.env || process.env.NODE_ENV || 'development' + + // get error callback + var onerror = opts.onerror + + return function (err) { + var headers + var msg + var status + + // ignore 404 on in-flight response + if (!err && res.headersSent) { + debug('cannot 404 after headers sent') + return + } + + // unhandled error + if (err) { + // respect status code from error + status = getErrorStatusCode(err) + + if (status === undefined) { + // fallback to status code on response + status = getResponseStatusCode(res) + } else { + // respect headers from error + headers = getErrorHeaders(err) + } + + // get error message + msg = getErrorMessage(err, status, env) + } else { + // not found + status = 404 + msg = 'Cannot ' + req.method + ' ' + encodeUrl(getResourceName(req)) + } + + debug('default %s', status) + + // schedule onerror callback + if (err && onerror) { + setImmediate(onerror, err, req, res) + } + + // cannot actually respond + if (res.headersSent) { + debug('cannot %d after headers sent', status) + if (req.socket) { + req.socket.destroy() + } + return + } + + // send response + send(req, res, status, headers, msg) + } +} + +/** + * Get headers from Error object. + * + * @param {Error} err + * @return {object} + * @private + */ + +function getErrorHeaders (err) { + if (!err.headers || typeof err.headers !== 'object') { + return undefined + } + + return { ...err.headers } +} + +/** + * Get message from Error object, fallback to status message. + * + * @param {Error} err + * @param {number} status + * @param {string} env + * @return {string} + * @private + */ + +function getErrorMessage (err, status, env) { + var msg + + if (env !== 'production') { + // use err.stack, which typically includes err.message + msg = err.stack + + // fallback to err.toString() when possible + if (!msg && typeof err.toString === 'function') { + msg = err.toString() + } + } + + return msg || statuses.message[status] +} + +/** + * Get status code from Error object. + * + * @param {Error} err + * @return {number} + * @private + */ + +function getErrorStatusCode (err) { + // check err.status + if (typeof err.status === 'number' && err.status >= 400 && err.status < 600) { + return err.status + } + + // check err.statusCode + if (typeof err.statusCode === 'number' && err.statusCode >= 400 && err.statusCode < 600) { + return err.statusCode + } + + return undefined +} + +/** + * Get resource name for the request. + * + * This is typically just the original pathname of the request + * but will fallback to "resource" is that cannot be determined. + * + * @param {IncomingMessage} req + * @return {string} + * @private + */ + +function getResourceName (req) { + try { + return parseUrl.original(req).pathname + } catch (e) { + return 'resource' + } +} + +/** + * Get status code from response. + * + * @param {OutgoingMessage} res + * @return {number} + * @private + */ + +function getResponseStatusCode (res) { + var status = res.statusCode + + // default status code to 500 if outside valid range + if (typeof status !== 'number' || status < 400 || status > 599) { + status = 500 + } + + return status +} + +/** + * Send response. + * + * @param {IncomingMessage} req + * @param {OutgoingMessage} res + * @param {number} status + * @param {object} headers + * @param {string} message + * @private + */ + +function send (req, res, status, headers, message) { + function write () { + // response body + var body = createHtmlDocument(message) + + // response status + res.statusCode = status + + if (req.httpVersionMajor < 2) { + res.statusMessage = statuses.message[status] + } + + // remove any content headers + res.removeHeader('Content-Encoding') + res.removeHeader('Content-Language') + res.removeHeader('Content-Range') + + // response headers + for (const [key, value] of Object.entries(headers ?? {})) { + res.setHeader(key, value) + } + + // security headers + res.setHeader('Content-Security-Policy', "default-src 'none'") + res.setHeader('X-Content-Type-Options', 'nosniff') + + // standard headers + res.setHeader('Content-Type', 'text/html; charset=utf-8') + res.setHeader('Content-Length', Buffer.byteLength(body, 'utf8')) + + if (req.method === 'HEAD') { + res.end() + return + } + + res.end(body, 'utf8') + } + + if (isFinished(req)) { + write() + return + } + + // unpipe everything from the request + req.unpipe() + + // flush the request + onFinished(req, write) + req.resume() +} -- cgit v1.2.3