const Youch = require('@nuxtjs/youch') const { join, resolve, relative, isAbsolute } = require('path') const { readFile } = require('fs-extra') module.exports = function errorMiddleware(err, req, res, next) { // ensure statusCode, message and name fields err.statusCode = err.statusCode || 500 err.message = err.message || 'Nuxt Server Error' err.name = !err.name || err.name === 'Error' ? 'NuxtServerError' : err.name // We hide actual errors from end users, so show them on server logs if (err.statusCode !== 404) { console.error(err) // eslint-disable-line no-console } const sendResponse = (content, type = 'text/html') => { // Set Headers res.statusCode = err.statusCode res.statusMessage = err.name res.setHeader('Content-Type', type + '; charset=utf-8') res.setHeader('Content-Length', Buffer.byteLength(content)) // Send Response res.end(content, 'utf-8') } // Check if request accepts JSON const hasReqHeader = (header, includes) => req.headers[header] && req.headers[header].toLowerCase().includes(includes) const isJson = hasReqHeader('accept', 'application/json') || hasReqHeader('user-agent', 'curl/') // Use basic errors when debug mode is disabled if (!this.options.debug) { // Json format is compatible with Youch json responses const json = { status: err.statusCode, message: err.message, name: err.name } if (isJson) { sendResponse(JSON.stringify(json, undefined, 2), 'text/json') return } const html = this.resources.errorTemplate(json) sendResponse(html) return } // Show stack trace const youch = new Youch( err, req, readSource.bind(this), this.options.router.base, true ) if (isJson) { youch.toJSON().then(json => { sendResponse(JSON.stringify(json, undefined, 2), 'text/json') }) } else { youch.toHTML().then(html => { sendResponse(html) }) } } async function readSource(frame) { // Remove webpack:/// & query string from the end const sanitizeName = name => name ? name.replace('webpack:///', '').split('?')[0] : null frame.fileName = sanitizeName(frame.fileName) // Return if fileName is unknown if (!frame.fileName) { return } // Possible paths for file const searchPath = [ this.options.srcDir, this.options.rootDir, join(this.options.buildDir, 'dist'), this.options.buildDir, process.cwd() ] // Scan filesystem for real source for (let pathDir of searchPath) { let fullPath = resolve(pathDir, frame.fileName) let source = await readFile(fullPath, 'utf-8').catch(() => null) if (source) { frame.contents = source frame.fullPath = fullPath if (isAbsolute(frame.fileName)) { frame.fileName = relative(this.options.rootDir, fullPath) } return } } // Fallback: use server bundle /* istanbul ignore if */ if (!frame.contents) { frame.contents = this.resources.serverBundle.files[frame.fileName] } }