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implemented basic client-server communication

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leca
2023-07-31 19:18:21 +03:00
parent 5fc231d445
commit eb425f4400
737 changed files with 96109 additions and 36 deletions
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1.2.0 / 2022-03-22
==================
* Remove set content headers that break response
* deps: on-finished@2.4.1
* deps: statuses@2.0.1
- Rename `425 Unordered Collection` to standard `425 Too Early`
1.1.2 / 2019-05-09
==================
* Set stricter `Content-Security-Policy` header
* deps: parseurl@~1.3.3
* deps: statuses@~1.5.0
1.1.1 / 2018-03-06
==================
* Fix 404 output for bad / missing pathnames
* deps: encodeurl@~1.0.2
- Fix encoding `%` as last character
* deps: statuses@~1.4.0
1.1.0 / 2017-09-24
==================
* Use `res.headersSent` when available
1.0.6 / 2017-09-22
==================
* deps: debug@2.6.9
1.0.5 / 2017-09-15
==================
* deps: parseurl@~1.3.2
- perf: reduce overhead for full URLs
- perf: unroll the "fast-path" `RegExp`
1.0.4 / 2017-08-03
==================
* deps: debug@2.6.8
1.0.3 / 2017-05-16
==================
* deps: debug@2.6.7
- deps: ms@2.0.0
1.0.2 / 2017-04-22
==================
* deps: debug@2.6.4
- deps: ms@0.7.3
1.0.1 / 2017-03-21
==================
* Fix missing `</html>` in HTML document
* deps: debug@2.6.3
- Fix: `DEBUG_MAX_ARRAY_LENGTH`
1.0.0 / 2017-02-15
==================
* Fix exception when `err` cannot be converted to a string
* Fully URL-encode the pathname in the 404 message
* Only include the pathname in the 404 message
* Send complete HTML document
* Set `Content-Security-Policy: default-src 'self'` header
* deps: debug@2.6.1
- Allow colors in workers
- Deprecated `DEBUG_FD` environment variable set to `3` or higher
- Fix error when running under React Native
- Use same color for same namespace
- deps: ms@0.7.2
0.5.1 / 2016-11-12
==================
* Fix exception when `err.headers` is not an object
* deps: statuses@~1.3.1
* perf: hoist regular expressions
* perf: remove duplicate validation path
0.5.0 / 2016-06-15
==================
* Change invalid or non-numeric status code to 500
* Overwrite status message to match set status code
* Prefer `err.statusCode` if `err.status` is invalid
* Set response headers from `err.headers` object
* Use `statuses` instead of `http` module for status messages
- Includes all defined status messages
0.4.1 / 2015-12-02
==================
* deps: escape-html@~1.0.3
- perf: enable strict mode
- perf: optimize string replacement
- perf: use faster string coercion
0.4.0 / 2015-06-14
==================
* Fix a false-positive when unpiping in Node.js 0.8
* Support `statusCode` property on `Error` objects
* Use `unpipe` module for unpiping requests
* deps: escape-html@1.0.2
* deps: on-finished@~2.3.0
- Add defined behavior for HTTP `CONNECT` requests
- Add defined behavior for HTTP `Upgrade` requests
- deps: ee-first@1.1.1
* perf: enable strict mode
* perf: remove argument reassignment
0.3.6 / 2015-05-11
==================
* deps: debug@~2.2.0
- deps: ms@0.7.1
0.3.5 / 2015-04-22
==================
* deps: on-finished@~2.2.1
- Fix `isFinished(req)` when data buffered
0.3.4 / 2015-03-15
==================
* deps: debug@~2.1.3
- Fix high intensity foreground color for bold
- deps: ms@0.7.0
0.3.3 / 2015-01-01
==================
* deps: debug@~2.1.1
* deps: on-finished@~2.2.0
0.3.2 / 2014-10-22
==================
* deps: on-finished@~2.1.1
- Fix handling of pipelined requests
0.3.1 / 2014-10-16
==================
* deps: debug@~2.1.0
- Implement `DEBUG_FD` env variable support
0.3.0 / 2014-09-17
==================
* Terminate in progress response only on error
* Use `on-finished` to determine request status
0.2.0 / 2014-09-03
==================
* Set `X-Content-Type-Options: nosniff` header
* deps: debug@~2.0.0
0.1.0 / 2014-07-16
==================
* Respond after request fully read
- prevents hung responses and socket hang ups
* deps: debug@1.0.4
0.0.3 / 2014-07-11
==================
* deps: debug@1.0.3
- Add support for multiple wildcards in namespaces
0.0.2 / 2014-06-19
==================
* Handle invalid status codes
0.0.1 / 2014-06-05
==================
* deps: debug@1.0.2
0.0.0 / 2014-06-05
==================
* Extracted from connect/express

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(The MIT License)
Copyright (c) 2014-2022 Douglas Christopher Wilson <doug@somethingdoug.com>
Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
'Software'), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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# finalhandler
[![NPM Version][npm-image]][npm-url]
[![NPM Downloads][downloads-image]][downloads-url]
[![Node.js Version][node-image]][node-url]
[![Build Status][github-actions-ci-image]][github-actions-ci-url]
[![Test Coverage][coveralls-image]][coveralls-url]
Node.js function to invoke as the final step to respond to HTTP request.
## Installation
This is a [Node.js](https://nodejs.org/en/) module available through the
[npm registry](https://www.npmjs.com/). Installation is done using the
[`npm install` command](https://docs.npmjs.com/getting-started/installing-npm-packages-locally):
```sh
$ npm install finalhandler
```
## API
```js
var finalhandler = require('finalhandler')
```
### finalhandler(req, res, [options])
Returns function to be invoked as the final step for the given `req` and `res`.
This function is to be invoked as `fn(err)`. If `err` is falsy, the handler will
write out a 404 response to the `res`. If it is truthy, an error response will
be written out to the `res` or `res` will be terminated if a response has already
started.
When an error is written, the following information is added to the response:
* The `res.statusCode` is set from `err.status` (or `err.statusCode`). If
this value is outside the 4xx or 5xx range, it will be set to 500.
* The `res.statusMessage` is set according to the status code.
* The body will be the HTML of the status code message if `env` is
`'production'`, otherwise will be `err.stack`.
* Any headers specified in an `err.headers` object.
The final handler will also unpipe anything from `req` when it is invoked.
#### options.env
By default, the environment is determined by `NODE_ENV` variable, but it can be
overridden by this option.
#### options.onerror
Provide a function to be called with the `err` when it exists. Can be used for
writing errors to a central location without excessive function generation. Called
as `onerror(err, req, res)`.
## Examples
### always 404
```js
var finalhandler = require('finalhandler')
var http = require('http')
var server = http.createServer(function (req, res) {
var done = finalhandler(req, res)
done()
})
server.listen(3000)
```
### perform simple action
```js
var finalhandler = require('finalhandler')
var fs = require('fs')
var http = require('http')
var server = http.createServer(function (req, res) {
var done = finalhandler(req, res)
fs.readFile('index.html', function (err, buf) {
if (err) return done(err)
res.setHeader('Content-Type', 'text/html')
res.end(buf)
})
})
server.listen(3000)
```
### use with middleware-style functions
```js
var finalhandler = require('finalhandler')
var http = require('http')
var serveStatic = require('serve-static')
var serve = serveStatic('public')
var server = http.createServer(function (req, res) {
var done = finalhandler(req, res)
serve(req, res, done)
})
server.listen(3000)
```
### keep log of all errors
```js
var finalhandler = require('finalhandler')
var fs = require('fs')
var http = require('http')
var server = http.createServer(function (req, res) {
var done = finalhandler(req, res, { onerror: logerror })
fs.readFile('index.html', function (err, buf) {
if (err) return done(err)
res.setHeader('Content-Type', 'text/html')
res.end(buf)
})
})
server.listen(3000)
function logerror (err) {
console.error(err.stack || err.toString())
}
```
## License
[MIT](LICENSE)
[npm-image]: https://img.shields.io/npm/v/finalhandler.svg
[npm-url]: https://npmjs.org/package/finalhandler
[node-image]: https://img.shields.io/node/v/finalhandler.svg
[node-url]: https://nodejs.org/en/download
[coveralls-image]: https://img.shields.io/coveralls/pillarjs/finalhandler.svg
[coveralls-url]: https://coveralls.io/r/pillarjs/finalhandler?branch=master
[downloads-image]: https://img.shields.io/npm/dm/finalhandler.svg
[downloads-url]: https://npmjs.org/package/finalhandler
[github-actions-ci-image]: https://img.shields.io/github/workflow/status/pillarjs/finalhandler/ci/master?label=ci
[github-actions-ci-url]: https://github.com/jshttp/pillarjs/finalhandler?query=workflow%3Aci

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# Security Policies and Procedures
## Reporting a Bug
The `finalhandler` team and community take all security bugs seriously. Thank
you for improving the security of Express. We appreciate your efforts and
responsible disclosure and will make every effort to acknowledge your
contributions.
Report security bugs by emailing the current owner(s) of `finalhandler`. This
information can be found in the npm registry using the command
`npm owner ls finalhandler`.
If unsure or unable to get the information from the above, open an issue
in the [project issue tracker](https://github.com/pillarjs/finalhandler/issues)
asking for the current contact information.
To ensure the timely response to your report, please ensure that the entirety
of the report is contained within the email body and not solely behind a web
link or an attachment.
At least one owner will acknowledge your email within 48 hours, and will send a
more detailed response within 48 hours indicating the next steps in handling
your report. After the initial reply to your report, the owners will
endeavor to keep you informed of the progress towards a fix and full
announcement, and may ask for additional information or guidance.

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/*!
* 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')
var unpipe = require('unpipe')
/**
* Module variables.
* @private
*/
var DOUBLE_SPACE_REGEXP = /\x20{2}/g
var NEWLINE_REGEXP = /\n/g
/* istanbul ignore next */
var defer = typeof setImmediate === 'function'
? setImmediate
: function (fn) { process.nextTick(fn.bind.apply(fn, arguments)) }
var isFinished = onFinished.isFinished
/**
* Create a minimal HTML document.
*
* @param {string} message
* @private
*/
function createHtmlDocument (message) {
var body = escapeHtml(message)
.replace(NEWLINE_REGEXP, '<br>')
.replace(DOUBLE_SPACE_REGEXP, ' &nbsp;')
return '<!DOCTYPE html>\n' +
'<html lang="en">\n' +
'<head>\n' +
'<meta charset="utf-8">\n' +
'<title>Error</title>\n' +
'</head>\n' +
'<body>\n' +
'<pre>' + body + '</pre>\n' +
'</body>\n' +
'</html>\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 && headersSent(res)) {
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) {
defer(onerror, err, req, res)
}
// cannot actually respond
if (headersSent(res)) {
debug('cannot %d after headers sent', status)
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
}
var headers = Object.create(null)
var keys = Object.keys(err.headers)
for (var i = 0; i < keys.length; i++) {
var key = keys[i]
headers[key] = err.headers[key]
}
return 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
}
/**
* Determine if the response headers have been sent.
*
* @param {object} res
* @returns {boolean}
* @private
*/
function headersSent (res) {
return typeof res.headersSent !== 'boolean'
? Boolean(res._header)
: res.headersSent
}
/**
* 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
res.statusMessage = statuses.message[status]
// remove any content headers
res.removeHeader('Content-Encoding')
res.removeHeader('Content-Language')
res.removeHeader('Content-Range')
// response headers
setHeaders(res, headers)
// 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
unpipe(req)
// flush the request
onFinished(req, write)
req.resume()
}
/**
* Set response headers from an object.
*
* @param {OutgoingMessage} res
* @param {object} headers
* @private
*/
function setHeaders (res, headers) {
if (!headers) {
return
}
var keys = Object.keys(headers)
for (var i = 0; i < keys.length; i++) {
var key = keys[i]
res.setHeader(key, headers[key])
}
}

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{
"name": "finalhandler",
"description": "Node.js final http responder",
"version": "1.2.0",
"author": "Douglas Christopher Wilson <doug@somethingdoug.com>",
"license": "MIT",
"repository": "pillarjs/finalhandler",
"dependencies": {
"debug": "2.6.9",
"encodeurl": "~1.0.2",
"escape-html": "~1.0.3",
"on-finished": "2.4.1",
"parseurl": "~1.3.3",
"statuses": "2.0.1",
"unpipe": "~1.0.0"
},
"devDependencies": {
"eslint": "7.32.0",
"eslint-config-standard": "14.1.1",
"eslint-plugin-import": "2.25.4",
"eslint-plugin-markdown": "2.2.1",
"eslint-plugin-node": "11.1.0",
"eslint-plugin-promise": "5.2.0",
"eslint-plugin-standard": "4.1.0",
"mocha": "9.2.2",
"nyc": "15.1.0",
"readable-stream": "2.3.6",
"safe-buffer": "5.2.1",
"supertest": "6.2.2"
},
"files": [
"LICENSE",
"HISTORY.md",
"SECURITY.md",
"index.js"
],
"engines": {
"node": ">= 0.8"
},
"scripts": {
"lint": "eslint .",
"test": "mocha --reporter spec --bail --check-leaks test/",
"test-ci": "nyc --reporter=lcovonly --reporter=text npm test",
"test-cov": "nyc --reporter=html --reporter=text npm test"
}
}