106 lines
3.3 KiB
JavaScript
106 lines
3.3 KiB
JavaScript
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/**
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* This module contains some common helpers shared between middlewares
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*/
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'use strict'
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const mime = require('mime')
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const parseRange = require('range-parser')
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const log = require('../logger').create('web-server')
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function createServeFile (fs, directory, config) {
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const cache = Object.create(null)
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return function (filepath, rangeHeader, response, transform, content, doNotCache) {
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let responseData
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function convertForRangeRequest () {
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const range = parseRange(responseData.length, rangeHeader)
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if (range === -2) {
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return 200 // malformed header string
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} else if (range === -1) {
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responseData = Buffer.alloc(0) // unsatisfiable range
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return 416
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} else if (range.type === 'bytes') {
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responseData = Buffer.from(responseData)
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if (range.length === 1) {
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const { start, end } = range[0]
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response.setHeader('Content-Range', `bytes ${start}-${end}/${responseData.length}`)
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response.setHeader('Accept-Ranges', 'bytes')
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response.setHeader('Content-Length', end - start + 1)
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responseData = responseData.slice(start, end + 1)
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return 206
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} else {
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responseData = Buffer.alloc(0) // Multiple ranges are not supported. Maybe future?
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return 416
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}
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}
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return 200 // All other states, ignore
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}
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if (directory) {
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filepath = directory + filepath
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}
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if (!content && cache[filepath]) {
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content = cache[filepath]
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}
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if (config && config.customHeaders && config.customHeaders.length > 0) {
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config.customHeaders.forEach((header) => {
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const regex = new RegExp(header.match)
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if (regex.test(filepath)) {
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log.debug(`setting header: ${header.name} for: ${filepath}`)
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response.setHeader(header.name, header.value)
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}
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})
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}
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if (content && !doNotCache) {
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log.debug(`serving (cached): ${filepath}`)
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response.setHeader('Content-Type', mime.getType(filepath, 'text/plain'))
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responseData = (transform && transform(content)) || content
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response.writeHead(rangeHeader ? convertForRangeRequest() : 200)
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return response.end(responseData)
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}
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return fs.readFile(filepath, function (error, data) {
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if (error) {
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return serve404(response, filepath)
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}
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if (!doNotCache) {
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cache[filepath] = data.toString()
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}
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log.debug('serving: ' + filepath)
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response.setHeader('Content-Type', mime.getType(filepath, 'text/plain'))
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responseData = (transform && transform(data.toString())) || data
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response.writeHead(rangeHeader ? convertForRangeRequest() : 200)
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return response.end(responseData)
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})
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}
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}
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function serve404 (response, path) {
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log.warn(`404: ${path}`)
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response.writeHead(404)
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return response.end('NOT FOUND')
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}
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function setNoCacheHeaders (response) {
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response.setHeader('Cache-Control', 'no-cache')
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response.setHeader('Pragma', 'no-cache')
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response.setHeader('Expires', (new Date(0)).toUTCString())
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}
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function setHeavyCacheHeaders (response) {
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response.setHeader('Cache-Control', 'public, max-age=31536000')
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}
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// PUBLIC API
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exports.createServeFile = createServeFile
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exports.setNoCacheHeaders = setNoCacheHeaders
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exports.setHeavyCacheHeaders = setHeavyCacheHeaders
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exports.serve404 = serve404
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